PIXTECH INC /DE/
SC 13D/A, 1999-11-22
COMPUTER TERMINALS
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<PAGE>   1

                                                      --------------------------
           UNITED STATES                              OMB APPROVAL
SECURITIES AND EXCHANGE COMMISSION                    --------------------------
     WASHINGTON, D.C. 20549                           OMB Number: 3235-0145

                                                      --------------------------
                                                      Expires: November 30, 1999
                                                      --------------------------
                                                      Estimated average burden
                                                      hours per response... 14.9
                                                      --------------------------

                                  SCHEDULE 13D

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 2)*


                                  PixTech, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   72583K 10 9
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


 Yves Morel, Avenue Olivier Perroy, 13790 Rousset, France, 011-33-4-42-29-10-00
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                OCTOBER 15, 1999
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box. [ ]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7 for other
parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

<PAGE>   2


CUSIP No 72583K 10 9

- --------------------------------------------------------------------------------
        1. Names of Reporting Persons. I.R.S. Identification Nos. of above
           persons (entities only).

           United Microelectronics Corporation

- --------------------------------------------------------------------------------

        2. Check the Appropriate Box if a Member of a Group (See Instructions)

           (a) _________________________________________________________________

           (b) _________________________________________________________________

- --------------------------------------------------------------------------------

        3. SEC Use Only

- --------------------------------------------------------------------------------

        4. Source of Funds (See Instructions)

           WC
- --------------------------------------------------------------------------------

        5. Check if Disclosure of Legal Proceeding Is Required Pursuant to
           Items 2(d) or 2(e)

- --------------------------------------------------------------------------------

        6. Citizenship or Place of Organization
           Taiwan, Republic of China
- --------------------------------------------------------------------------------

Number of         7. Sole Voting Power
Shares               1,111,111
Beneficially      --------------------------------------------------------------
Owned by
Each              8. Shared Voting Power
Reporting            0
Person With       --------------------------------------------------------------

                  9. Sole Dispositive Power
                     1,111,111
                  --------------------------------------------------------------

                  10. Shared Dispositive Power
                      0
- --------------------------------------------------------------------------------


                                      -2-
<PAGE>   3

- --------------------------------------------------------------------------------

        11. Aggregate Amount Beneficially Owned by Each Reporting Person

            1,111,111
- --------------------------------------------------------------------------------

        12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares: X

            (See discussion in Item 2 below).

- --------------------------------------------------------------------------------

        13. Percent of Class Represented by Amount in Row (11)
            3.1%
- --------------------------------------------------------------------------------

        14. Type of Reporting Person (See Instructions)
            CO
- --------------------------------------------------------------------------------

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________


- --------------------------------------------------------------------------------


        This Amendment No. 2 to the Schedule 13D amends and restates the
Schedule 13D initially filed by United Microelectronics Corporation ("UMC") on
February 21, 1997, as amended on February 26, 1997.

        The filing of this Schedule 13D is not, and should not be deemed to be,
an admission that such Schedule 13D is required to be filed. See the discussion
under Item 2.

ITEM 1. SECURITY AND ISSUER.

(a) The title of the class of equity securities to which this statement relates
is Common Stock.

(b) The name and address of the principal executive offices of the issuer of
such securities is: PixTech, Inc. ("PixTech"), Avenue Olivier Perroy, 13790
Rousset, France.

ITEM 2. IDENTITY AND BACKGROUND.

                                      -3-
<PAGE>   4


        This statement is being filed by United Microelectronics Corporation.
This Amendment No. 2 to the Schedule 13D amends and restates the Schedule 13D
initially filed by UMC on February 21, 1997, as amended on February 26, 1997,
which disclosed UMC's purchase of 1,111,111 shares of PixTech, Inc. ("PixTech").

        A separate filing pursuant to Regulation 13D of the Securities Exchange
Act of 1934 (the "1934 Act") has been filed by Unipac Optoelectronics
Corporation ("Unipac") with respect to 12,427,146 shares of PixTech, Inc.
purchased by Unipac on October 15, 1999. UMC did not directly acquire any
additional Pixtech shares as a result of the October 15, 1999 transaction
between Unipac and PixTech, Inc.

        UMC owns approximately 40.7% of Unipac's outstanding shares. Several
persons serve as directors on both the boards of directors of UMC and Unipac,
including Robert Tsao, who serves as Chairman of both companies. Mr. Chia-Tsung
Stan Hung also serves as the CFO of both companies.

        UMC and Unipac exist as separate and independent corporate entities, and
the two companies have separate and distinct management teams. Their investment
decisions are made independently, and their clients are generally different
organizations. The 12,427,146 PixTech shares acquired by Unipac in the October
15, 1999 transaction are owned directly by Unipac.

        UMC and Unipac are of the view that they are not acting as a "group" for
purposes of Section 13(d) under the 1934 Act and that they are not otherwise
required to attribute to each other the "beneficial ownership" of securities
"beneficially owned" by the other corporation within the meaning of Rule 13d-3
promulgated under the 1934 Act. Therefore, they are of the view that the shares
held by the other corporation need not be aggregated for purposes of Section
13(d). However, UMC is making the disclosures herein with respect to Unipac on a
voluntary basis.

(a) Name of Person Filing: United Microelectronics Corporation ("UMC").

(b) Address of Principal Business: 13 Innovation Road I, Science-Based
Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

(c) Principal Business: Manufacturer of semiconductor wafers.

(d) Criminal Proceedings: During the last five years, neither UMC nor any
executive officer or director of UMC has been convicted in any criminal
proceeding.

(e) Civil Proceedings: During the last five years, neither UMC nor any executive
officer or director of UMC has been party to any civil proceeding of a judicial
or administrative body of competent jurisdiction as a result of which such
person was or is subject to any judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, Federal or
State securities laws or finding any violation with respect to such laws.

(f) Place of Organization: Taiwan, Republic of China.

                                      -4-
<PAGE>   5


Attached hereto as Appendix A is information required by this Item 2 with
respect to the executive officers and directors of UMC.

The following is information concerning Unipac Optoelectronics Corporation
required by this Item 2:

(a) Name of Person: Unipac Optoelectronics Corporation.

(b) Address of Principal Business Office: No.5, Li-Hsin Road 6, Science-Based
Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

(c) Principal Business: Design, development and manufacture of TFT displays and
related hardware and software.

(d) Criminal Proceedings: During the last five years, neither Unipac nor any
executive officer or director of Unipac has been convicted in any criminal
proceeding.

(e) Civil Proceedings: During the last five years, neither Unipac nor any
executive officer or director of Unipac has been party to any civil proceeding
of a judicial or administrative body of competent jurisdiction as a result of
which such person was or is subject to any judgment, decree or final order
enjoining future violations of, or prohibiting or mandating activities subject
to, Federal or State securities laws or finding any violation with respect to
such laws.

(f) Place of Organization: Taiwan, Republic of China.

Attached hereto as Appendix B is information required by this Item 2 with
respect to the executive officers and directors of Unipac.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

        UMC used $5,000,000 of UMC working capital to purchase 1,111,111 shares
of PixTech stock.

        UMC did not directly acquire any additional PixTech shares as a result
of the transaction dated October 15, 1999 between Unipac and PixTech. (See
discussion in Item 2).

ITEM 4. PURPOSE OF TRANSACTION.

Not applicable.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

                                      -5-
<PAGE>   6


        Reference is made to Item 2 for a disclaimer of "beneficial ownership"
with respect to the securities which are "beneficially owned" by the other
corporation. As discussed in Item 2, the "beneficial ownership" information
contained herein concerning UMC does not include 12,427,146 PixTech shares owned
by Unipac, which Unipac acquired in a transaction dated October 15, 1999.

The following information concerns United Microelectronics Corporation:

(a) Number of Shares Beneficially owned: UMC beneficially owns 1,111,111 shares
of PixTech Common Stock as a result of a transaction dated February 14, 1997
(See Exhibit 1).

        Percent of Class: 3.1% (based upon the number of shares of PixTech
Common Stock outstanding reported as of November 12, 1999 in PixTech's 424B3
Prospectus Supplement).

(b) Number of shares as to which there is sole power to vote or to direct the
vote, sole power to dispose or to direct the disposition, or shared power to
dispose or to direct the disposition: 1,111,111.

(c) Other than the transaction described herein, UMC has not effected any
transactions in the class of securities reported on during the past sixty days.

(d) No other person has the right to receive or the power to direct the receipt
of dividends from, or the proceeds from the sale of, the Securities.

(e) On May 19, 1999, UMC ceased to be the beneficial owner of more than five
percent of PixTech's outstanding shares.

The following information concerns Unipac Optoelectronics Corporation:

(a) Number of Shares Beneficially owned: Unipac beneficially owns 12,427,146
shares of PixTech Common Stock.

        Percent of Class: 34.5% (based upon the number of shares of PixTech
Common Stock outstanding reported as of November 12, 1999 in PixTech's 424B3
Prospectus Supplement).

(b) Number of shares as to which there is sole power to vote or to direct the
vote, sole power to dispose or to direct the disposition, or shared power to
dispose or to direct the disposition: 12,427,146.

(c) Other than the transaction described herein, Unipac has not effected any
transactions in the class of securities reported on during the past sixty days.

(d) No other person has the right to receive or the power to direct the receipt
of dividends from, or the proceeds from the sale of, the Securities.

(e) Not applicable.

                                      -6-
<PAGE>   7


ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
SECURITIES OF PIXTECH.

Not applicable.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

Exhibit 1: Common Stock Purchase Agreement dated February 14, 1997 between
United Microelectronics Corporation and PixTech, Inc.

                                      -7-
<PAGE>   8


                                   APPENDIX A

                DIRECTORS OF UNITED MICROELECTRONICS CORPORATION

The following is a list of all members of the Board of Directors of United
Microelectronics Corporation. All directors are citizens of the Republic of
China.

Name: Robert H.C. Tsao

Business Address: 13 Innovation Road I, Science-Based Industrial Park, Hsin-Chu
City, Taiwan

Principal Occupation: Chairman

Name, principal business and address of corporation or other organization on
which employment is conducted: United Microelectronics Corporation, 13
Innovation Road I, Science-Based Industrial Park, Hsin-Chu City, Taiwan


Name: John Hsuan

Business Address: 13 Innovation Road I, Science-Based Industrial Park, Hsin-Chu
City, Taiwan

Principal Occupation: Chief Executive Officer, UMC Group

Name, principal business and address of corporation or other organization on
which employment is conducted: United Microelectronics Corporation, 13
Innovation Road I, Science-Based Industrial Park, Hsin-Chu City, Taiwan


Name: C.J. Liang

Business Address: No. 91 Hen-Yang Rd, Taipei, Taiwan

Principal Occupation: Chairman

Name, principal business and address of corporation or other organization on
which employment is conducted: Chiao Tung Bank, No. 91 Hen-Yang Rd, Taipei,
Taiwan

<PAGE>   9


Name: Donald Brooks

Business Address: 3F, No. 76, Sec 2, Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.

Principal Occupation: Board Member

Name, principal business and address of corporation or other organization on
which employment is conducted: Hsun-Chieh Investment Corp., 3F, No. 76, Sec 2,
Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.

Name: Ing Dar Liu

Business Address: 13 Innovation Road I, Science-Based Industrial Park, Hsin-Chu
City, Taiwan

Principal Occupation: Chief of Operation Officer, UMC Group

Name, principal business and address of corporation or other organization on
which employment is conducted: United Microelectronics Corporation, 13
Innovation Road I, Science-Based Industrial Park, Hsin-Chu City, Taiwan


Name: Peter T.C. Chang

Business Address: United Microelectronics Corporation, 13 Innovation Road I,
Science-Based Industrial Park, Hsin-Chu City, Taiwan

Principal Occupation: Chief Executive Officer Foundry Operations, UMC

Name, principal business and address of corporation or other organization on
which employment is conducted: Hsun-Chieh Investment Corp., 3F, No. 76, Sec 2,
Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.


Name: Jing-Shan Aur

Business Address: United Microelectronics Corporation, 13 Innovation Road I,
Science-Based Industrial Park, Hsin-Chu City, Taiwan

Principal Occupation: Chief Administrative Officer

Name, principal business and address of corporation or other organization on
which employment is conducted: Chuin-Li Investment Corp., 3F, No. 76, Sec 2,
Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.

Name: H.J. Wu


                                      -2-
<PAGE>   10


Business Address: United Microelectronics Corporation, 13 Innovation Road I,
Science-Based Industrial Park, Hsin-Chu City, Taiwan

Principal Occupation: President of UMC

Name, principal business and address of corporation or other organization on
which employment is conducted: Chuin-Tsie Investment Corp., 3F, No. 76, Sec 2,
Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.


Name: Mao-Chung Lin

Business Address: 1F, No. 89, Cheung-An W. Rd, Taipei, Taiwan, R.O.C.

Principal Occupation: President, Sunrox International Inc.

Name, principal business and address of corporation or other organization on
which employment is conducted: Sunrox International Inc., 1F, No. 89, Cheung-An
W. Rd, Taipei, Taiwan, R.O.C.


Name: Jack K.C. Wang

Business Address: 23F, No. 98, Sec 2, Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.

Principal Occupation: Chairman

Name, principal business and address of corporation or other organization on
which employment is conducted: Sen Dah Investment Inc., 23F, No. 98, Sec 2,
Tun-Hwa S. Rd, Taipei, Taiwan, R.O.C.


Name: C. Y. Huang

Business Address: 14F, Sec. 1, Kee-Lung Rd., Taipei, Taiwan, R.O.C.

Principal Occupation: Chief Representative

Name, principal business and address of corporation or other organization on
which employment is conducted: Diawa Institute of Research Ltd., 14F, Sec. 1,
Kee-Lung Rd., Taipei, Taiwan, R.O.C.


                                      -3-
<PAGE>   11


EXECUTIVE OFFICERS OF UNITED MICROELECTRONICS CORPORATION

The following is a list of all executive officers of United Microelectronics
Corporation, excluding executive officers who are also directors. All executive
officers are citizens of the Republic of China.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------

POSITION               NAME                    ADDRESS

- --------------------------------------------------------------------------------------------
<S>                    <C>                     <C>
Vice President         Andy Chang              13 Innovation Road I, Science-Based
of Sales and                                   Industrial Park, Hsin-Chu City, Taiwan
Marketing

- --------------------------------------------------------------------------------------------

Chief Financial        Chia-Tsung Stan Hung    3F, No. 76, Sec 2, Tun-Hwa S. Rd., Taipei,
Officer                                        Taiwan, R.O.C.

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------
</TABLE>

                                      -4-
<PAGE>   12

                                   APPENDIX B

                 DIRECTORS OF UNIPAC OPTOELECTRONICS CORPORATION

The following is a list of all members of the Board of Directors of Unipac
Optoelectronics Corporation, Inc. All directors are citizens of the Republic of
China.

DIRECTORS

Name: Robert H.C. Tsao

Business Address: United Microelectronics Corporation, 13 Innovation Road I,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: Chairman, United Microelectronics Corporation

Name, principal business and address of corporation or other organization on
which employment is conducted: United Microelectronics Corporation, 13
Innovation Road I, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.


Name: John Hsuan / Ing-Dar Liu

Business Address: United Microelectronics Corporation, 13 Innovation Road I,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: Chief Executive Officer/Chief of Operation Officer of
United Microelectronics Corporation

Name, principal business and address of corporation or other organization on
which employment is conducted: United Microelectronics Corporation, 13
Innovation Road I, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.


Name: Hsing-Chien Tuan

Business Address: Unipac Optoelectronics Corporation, No.5, Li-Hsin Road 6,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: President, Unipac Optoelectronics Corporation

<PAGE>   13


Name, principal business and address of corporation or other organization on
which employment is conducted: Unipac Optoelectronics Corporation, No.5, Li-Hsin
Road 6, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.


Name: C. Y. Chen

Business Address: Chiao Tung Bank, 5F, 91, Heng Yang Rd., Taipei, Taiwan

Principal Occupation: Manager, Chiao Tung Bank

Name, principal business and address of corporation or other organization on
which employment is conducted: Chiao Tung Bank, 5F, 91, Heng Yang Rd., Taipei,
Taiwan


Name: Theodore M.H. Huang

Business Address: 1568, Sec.1, Chung Shan Rd., Kung Yin, Tao Yuang Taiwan

Principal Occupation: Chairman

Name, principal business and address of corporation or other organization on
which employment is conducted: TECO Information Systems Co., Ltd., 1568, Sec.1,
Chung Shan Rd., Kung Yin, Tao Yuang Taiwan


Name: C. Y. Wang

Business Address: 6F, 232, Pa Teh Rd., Sec.2, Taipei, Taiwan

Principal Occupation: Manager

Name, principal business and address of corporation or other organization on
which employment is conducted: Central Investment Holding Co., Ltd., 6F, 232, Pa
Teh Rd., Sec.2, Taipei, Taiwan

                                      -2-
<PAGE>   14


Name: M.H. Hung

Business Address: 10F, 57, Po I Rd., Taipei, Taiwan

Principal Occupation: Chairman

Name, principal business and address of corporation or other organization on
which employment is conducted: National Finance Corporation, Ltd., 10F, 57, Po I
Rd., Taipei, Taiwan


Name: Cheng Xin Technology Development Corp.

Business Address: 5F, 143, Min Sheng E. Rd., Sec.2, Taipei, Taiwan

Principal Occupation: President

Name, principal business and address of corporation or other organization on
which employment is conducted: Cheng Xin Technology Development Corp., 5F, 143,
Min Sheng E. Rd., Sec.2, Taipei, Taiwan


Name: David Su

Business Address: Unipac Optoelectronics Corporation, No.5, Li-Hsin Road 6,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: Vice-President of Product Development of Unipac
Optoelectronics Corporation

Name, principal business and address of corporation or other organization on
which employment is conducted: Unipac Optoelectronics Corporation, No.5, Li-Hsin
Road 6, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.


Name: Fan Luo

Business Address: Unipac Optoelectronics Corporation, No.5, Li-Hsin Road 6,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: Vice-President of Technology Development of Unipac
Optoelectronics Corporation

Name, principal business and address of corporation or other organization on
which employment is conducted: Unipac Optoelectronics Corporation, No.5, Li-Hsin
Road 6, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

                                      -3-
<PAGE>   15


Name: Sherman Shen

Business Address: Unipac Optoelectronics Corporation, No.5, Li-Hsin Road 6,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: Vice-President of Production of Unipac Optoelectronics
Corporation

Name, principal business and address of corporation or other organization on
which employment is conducted: Unipac Optoelectronics Corporation, No.5, Li-Hsin
Road 6, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.


Name: Steve Wang

Business Address: Unipac Optoelectronics Corporation, No.5, Li-Hsin Road 6,
Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

Principal Occupation: Vice-President of Sales and Marketing Unipac
Optoelectronics Corporation

Name, principal business and address of corporation or other organization on
which employment is conducted: Unipac Optoelectronics Corporation, No.5, Li-Hsin
Road 6, Science-Based Industrial Park, Hsin-Chu City, Taiwan, R.O.C.

                                      -4-
<PAGE>   16


            EXECUTIVE OFFICERS OF UNIPAC OPTOELECTRONICS CORPORATION

The following is a list of all executive officers of Unipac Optoelectronics
Corporation, excluding executive officers who are also directors. All executive
officers are citizens of the Republic of China.

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------

POSITION               NAME                    ADDRESS

- --------------------------------------------------------------------------------------------
<S>                    <C>                     <C>

- --------------------------------------------------------------------------------------------

Chief Financial        Chia-Tsung Stan Hung    3F, No. 76, Sec 2, Tun-Hwa S. Rd., Taipei,
Officer                                        Taiwan, R.O.C.

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------

- --------------------------------------------------------------------------------------------
</TABLE>


<PAGE>   17


                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Date: October 25, 1999

      -----------------


Signature: /s/ Robert Tsao

          ------------------



Name/Title: Robert Tsao, Chairman United Microelectronics Corp.


                                      -2-
<PAGE>   18


                              INDEX TO EXHIBITS

Exhibit 1: Common Stock Purchase Agreement dated February 14, 1997 between
United Microelectronics Corporation and PixTech, Inc.



<PAGE>   1

                                                                       EXHIBIT 1
          4
             STOCK PURCHASE AGREEMENT DATED 2/14/97

                         COMMON STOCK PURCHASE AGREEMENT

                                     between

                                  PIXTECH, INC.

                                       and

                          UNITED MICROELECTRONICS CORP.

                          dated as of February 14, 1997

                                TABLE OF CONTENTS

<TABLE>
<S>          <C>                                                         <C>
SECTION 1.   Authorization of Sale of the Shares........................   1
             -----------------------------------

SECTION 2.   Sale of the Shares.........................................   1
             ------------------

SECTION 3.   Delivery of the Shares at the Closing......................   1
             -------------------------------------

SECTION 4.   Representations, Warranties and Covenants
             -----------------------------------------
             of PixTech.................................................   2
             ----------
    4.1      Organization and Qualification.............................   2
             ------------------------------
    4.2      Authorized Capital Stock...................................   2
             ------------------------
    4.3      Consents; Due Execution; Delivery and Performance
             -------------------------------------------------
             of the Agreement...........................................   2
             ----------------
    4.4      Issuance, Sale and
             ------------------
             Delivery of the Shares.....................................   2
             ----------------------
    4.5      Exempt Transaction.........................................   2
             ------------------
    4.6      Compliance with Rule 144...................................   2
             ------------------------
    4.7      Disclosure.................................................   3
             ----------
    4.8      Additional Information.....................................   3
             ----------------------
    4.9      No Material Changes........................................   3
             -------------------

SECTION 5.   Representations, Warranties and Covenants
             -----------------------------------------
             of UMC.....................................................   3
             ------
    5.1      Investment Considerations..................................   3
</TABLE>


<PAGE>   2


<TABLE>
<S>          <C>                                                         <C>
             -------------------------
    5.2      Due Execution, Delivery and Performance of the
             ----------------------------------------------
             Agreement..................................................   4
             ---------

SECTION 6.   Conditions to the Obligations of the
             ------------------------------------
             Purchasers.................................................   5
             ----------
    6.1      Accuracy of Representations and Warranties.................   5
             ------------------------------------------
    6.2      Performance................................................   5
             -----------
    6.3      Opinion of Counsel.........................................   5
             ------------------
    6.4      Closing of European Offering...............................   5
             ----------------------------
    6.5      Certificates and Documents.................................   5
             --------------------------
    6.6      Other Matters..............................................   5
             -------------

SECTION 7.   Conditions to the Obligations of PixTech...................   6
             ----------------------------------------
    7.1      Accuracy of Representations and
             -------------------------------
             Warranties.................................................   6
             ----------
    7.2      Performance................................................   6
             -----------

SECTION 8.   Survival of Representations, Warranties and
             -------------------------------------------
             Agreements; Assignability of Rights........................   6
             -----------------------------------

SECTION 9.   Registration Rights........................................   6
             -------------------
    9.1      Registration of Shares.....................................   6
             ----------------------
    9.2      Indemnification............................................   7
             ---------------
    9.3      "Stand-Off" Agreement......................................   8
             ---------------------
    9.4      Termination................................................   9
             -----------

SECTION 10.  Miscellaneous..............................................   9
             -------------
   10.1      Notices....................................................   9
             -------

   10.2    Entire Agreement............................................    9
           ----------------
   10.3    Assignment..................................................   10
           ----------
   10.4    Amendments and Waivers......................................   10
           ----------------------
   10.5    Headings....................................................   10
           --------
   10.6    Severability................................................   10
           ------------
</TABLE>


<PAGE>   3


<TABLE>
<S>          <C>                                                         <C>
   10.7    Governing Law...............................................   10
           -------------
   10.8    Counterparts................................................   10
           ------------
   10.9    Expenses....................................................   10
           --------
   10.10   Publicity...................................................   10
           ---------
   10.11   Confidentiality.............................................   11
           ---------------
</TABLE>


                         COMMON STOCK PURCHASE AGREEMENT

        THIS COMMON STOCK PURCHASE AGREEMENT dated as of February 14, 1997 (the
"Agreement") is made between PIXTECH, INC., a corporation organized under the
laws of the State of Delaware having its principal offices at Avenue Olivier
Perroy, Zone Industrielle de Rousset, 13790 Rousset France, ("PixTech"), and
United Microelectronics Corp., a corporation organized under the laws of the
Republic of China (Taiwan) having its principal offices at 2F, No. 76 Sec. 2,
Tunhwa S. Rd., Taipei, Taiwan, R.O.C. ("UMC").

                                  R E C I T A L

        PixTech desires to sell to UMC, and UMC desires to purchase from
PixTech, shares of PixTech's common stock on the terms described herein.

        NOW THEREFORE, in consideration of the premises and of the covenants
herein contained, the parties hereto mutually agree as follows:

     SECTION 1.  Authorization of Sale of the Shares.  Subject to the terms and
                 -----------------------------------
conditions of this Agreement, PixTech has authorized the sale to UMC of that
number of shares of the Common Stock, par value $0.01 per share (the "Common
Stock"), of PixTech equal to the quotient obtained by dividing $5,000,000 by the
per share price of the shares of Common Stock sold by PixTech in its European
offering (the "European Offering") pursuant to PixTech's Preliminary Prospectus
dated November 28, 1996, and any amendments or supplements thereto (the
"Prospectus"). Collectively, the shares of Common Stock which may be purchased
pursuant to this Section 1 are referred to herein as the "Shares."

     SECTION 2.  Sale of the Shares.  PixTech shall sell to UMC, and UMC shall
                 ------------------
purchase from PixTech, upon the terms and conditions hereinafter set forth, the
Shares, at a price per share equal to the price per share of the shares of
Common Stock sold by PixTech in its European Offering (as so determined, the
"Per Share Price"). The aggregate purchase price for the Shares (the "Aggregate
Purchase Price") shall be $5,000,000.

     SECTION 3.  Delivery of the Shares at the Closing.  The closing of the
                 -------------------------------------
purchase and sale of the Shares (the "Closing") shall occur on the date of the
closing of the European Offering or at such other time and date and at a place
to be agreed upon by PixTech and UMC (the "Closing Date"). Subject to the terms
and conditions of this Agreement, at the Closing, UMC shall pay to PixTech an
amount in cash or by wire transfer equal to the Aggregate Purchase Price and
PixTech shall deliver to UMC one or more stock certificates registered in the
name of UMC, or in such nominee name(s) as designated by UMC, representing the
number of Shares being purchased.

     SECTION 4.  Representations, Warranties and Covenants of PixTech.  PixTech
                 ----------------------------------------------------
hereby represents and warrants to, and covenants with, UMC as follows:


<PAGE>   4


          4.1  Organization and Qualification.  PixTech is a corporation duly
               ------------------------------
organized, validly existing and in good standing under the laws of the State of
Delaware and has all requisite corporate power and authority to conduct its
business as currently conducted.

          4.2  Authorized Capital Stock.  As of the date hereof, the authorized
               ------------------------
capital stock of PixTech consists of (a) 30,000,000 shares of common stock,
$0.01 par value per share, of which on January 27, 1996, 8,146,696 shares were
validly issued and outstanding, fully paid and non-assessable, and (b) 1,000,000
shares of undesignated preferred stock, $0.01 par value per share, none of which
are issued and outstanding.

          4.3  Consents; Due Execution; Delivery and Performance of the
               --------------------------------------------------------
Agreement.  PixTech's execution, delivery and performance of this Agreement (a)
- ---------
has been duly authorized under Delaware law by all requisite corporate action by
PixTech, (b) will not violate any law or the Restated Certificate of
Incorporation or Restated By-laws of PixTech or any other corporation of which
PixTech owns at least 50% of the outstanding voting stock (a "PixTech
Subsidiary") or any provision of any material indenture, mortgage, agreement,
contract or other material instrument to which PixTech or any PixTech Subsidiary
is a party or by which any of their respective properties or assets is bound as
of the date hereof or (c) require any consent by any person under, constitute or
result (upon notice or lapse of time or both) in a breach of any term, condition
or provision of, or constitute a default or give rise to any right of
termination or acceleration under any such indenture, mortgage, agreement,
contract or other material instrument or result in the creation or imposition of
any lien, security interest, mortgage, pledge, charge or other encumbrance, of
any material nature whatsoever, upon any properties or assets of PixTech or any
PixTech Subsidiary. Upon its execution and delivery, and assuming the valid
execution thereof by UMC, the Agreement will constitute a valid and binding
obligation of PixTech, enforceable against PixTech in accordance with its terms,
except as enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting creditors' and contracting
parties' rights generally and except as enforceability may be subject to general
principles of equity (regardless of whether such enforceability is considered in
a proceeding in equity or at law).

          4.4  Issuance, Sale and Delivery of the Shares.  When issued and paid
               -----------------------------------------
for, the Shares to be sold hereunder by PixTech will be validly issued and
outstanding, fully paid and non-assessable.

          4.5  Exempt Transaction.  Subject to the accuracy of UMC's
               ------------------
representations in Section 5.1 of this Agreement, the issuance of the Shares
will constitute a transaction exempt from the registration requirements of
Section 5 of the Securities Act of 1933, as amended (the "Securities Act") in
reliance upon Section 4(2) of the Securities Act and the regulations promulgated
pursuant thereto.

          4.6  Compliance with Rule 144.  At the written request of UMC at any
               ------------------------
time and from time to time, PixTech shall furnish to UMC, within three days
after receipt of such request, a written statement confirming PixTech's
compliance with the filing requirements of the Securities and Exchange
Commission (the "SEC") set forth in SEC Rule 144 as amended from time to time.

          4.7  Disclosure.  Neither this Agreement, nor any other items prepared
               ----------
or supplied to UMC by or on behalf of PixTech with respect to the transactions


<PAGE>   5


contemplated hereby contain any untrue statement of a material fact or omit a
material fact necessary to make each statement contained herein or therein not
misleading. There is no fact which PixTech has not disclosed to UMC in writing
and of which any of its directors or executive officers is aware (other than
general economic conditions) and which has had or would reasonably be expected
to have a material adverse effect upon the financial condition, operating
results, assets, customer or supplier relations, employee relations or business
prospects of PixTech or PixTech Subsidiaries taken as a whole.

          4.8  Additional Information; Eligibility for Use of Form S-3.  All
               -------------------------------------------------------
reports filed by PixTech with the SEC pursuant to the reporting requirements of
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), when
filed, did not contain any untrue statement of a material fact or omit to state
any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances in which they were made, not
misleading. PixTech has made all filings with the SEC which it is required to
make, and PixTech has not received any request from the SEC to file any
amendment or supplement to any such reports. PixTech meets the eligibility
requirements set forth in paragraph I of the General Instructions to Form S-3
for the use of such Form for the registration of securities in a transaction
involving secondary offerings, as described in such General Instructions.

          4.9  No Material Changes.  As of the date hereof, there has been no
               -------------------
material adverse change in the financial condition or results of operations of
PixTech since the filing date of PixTech's last report with the Securities and
Exchange Commission pursuant to the reporting requirements of the Exchange Act.

     SECTION 5.  Representations, Warranties and Covenants of UMC.
                 ------------------------------------------------

          5.1  Investment Considerations.  UMC represents and warrants to, and
               -------------------------
covenants with, PixTech that:

               (a) UMC is knowledgeable, sophisticated and experienced in
          making, and is qualified to make, decisions with respect to
          investments in shares presenting an investment decision like that
          involved in the purchase of the Shares, including investments in
          securities issued by companies comparable to PixTech, and has
          requested, received, reviewed and considered all information it deems
          relevant in making an informed decision to purchase the Shares;

               (b) UMC is acquiring the Shares in the ordinary course of its
          business and for its own account for investment only and with no
          present intention of distributing any of such Shares or any
          arrangement or understanding with any other persons regarding the
          distribution of such Shares;

               (c) UMC understands that the Shares are "restricted securities"
          under the federal securities laws inasmuch as they are being acquired
          from PixTech in a transaction not involving a public offering and that
          under such laws and applicable regulations such securities may be
          resold without registration under the Securities Act only in certain
          limited circumstances. In this connection UMC represents that it is
          familiar with SEC Rule 144, as presently in effect, and understands
          the resale limitations imposed thereby and by the Securities Act;

               (d) UMC will not, directly or indirectly, offer, sell, pledge,
          transfer or otherwise dispose of (or solicit any offers to buy,
          purchase or otherwise acquire or take a pledge of) any of the Shares
          except in compliance with the Securities Act, and the rules and
          regulations promulgated thereunder.


<PAGE>   6


               (e) UMC qualifies as an "accredited investor" within the meaning
          of Rule 501(a)(3) of Regulation D promulgated under the Securities Act
          and is not a resident of any of the United States of America; and

               (f) It is understood that the certificates evidencing the Shares
          shall bear the following legend unless and until the resale of the
          Shares pursuant to an effective Registration Statement or until the
          Shares may be sold under Rule 144 without restrictions:

     THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933.
     THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE
     ABSENCE OF A REGISTRATION STATEMENT IN EFFECT WITH RESPECT TO THE
     SECURITIES UNDER SUCH ACT OR, IF REQUESTED BY PIXTECH, AN OPINION OF
     COUNSEL REASONABLY SATISFACTORY TO PIXTECH AND ITS COUNSEL, THAT SUCH
     REGISTRATION IS NOT REQUIRED UNDER SUCH ACT.

          5.2  Due Execution, Delivery and Performance of the Agreement.  UMC
               --------------------------------------------------------
further represents and warrants to, and covenants with, PixTech that (a) UMC is
a corporation duly organized, validly existing and in good standing under the
laws of the Republic of China (Taiwan) and has full right, power, authority and
capacity to enter into this Agreement and to consummate the transactions
contemplated hereby and has taken all necessary action to authorize the
execution, delivery and performance of this Agreement, (b) the execution,
delivery and performance of this Agreement will not violate any law or the
charter documents of UMC or any other corporation of which UMC owns at least 50%
of the outstanding voting stock (a "UMC Subsidiary") or any provision of any
material indenture, mortgage, agreement, contract or other material instrument
to which UMC or any UMC Subsidiary is a party or by which UMC, any UMC
Subsidiary, or any of their respective properties or assets is bound as of the
date hereof, or result in a breach of or constitute (upon notice or lapse of
time or both) a default under any such indenture, mortgage, agreement, contract
or other material instrument or result in the creation or imposition of any
lien, security interest, mortgage, pledge, charge or encumbrance, of any
material nature whatsoever, upon any assets of UMC or any UMC Subsidiary, and
(c) upon the execution and delivery of this Agreement, and assuming the valid
execution thereof by PixTech, this Agreement shall constitute a valid and
binding obligation of UMC enforceable in accordance with its terms, except as
enforceability may be limited by applicable bankruptcy, insolvency,
reorganization, moratorium or similar laws affecting creditors' and contracting
parties' rights generally and except as enforceability may be subject to general
principles of equity (regardless of whether such enforceability is considered in
a proceeding in equity or at law).

     SECTION 6.  Conditions to the Obligations of the Purchasers.
                 -----------------------------------------------
          The obligations of UMC under this Agreement are subject to the
fulfillment, or the waiver by UMC, of the conditions set forth in this Section 6
on or before the Closing Date.

          6.1 Accuracy of Representations and Warranties. Each representation
               ------------------------------------------
and warranty of PixTech contained in this Agreement shall be true on and as of
the Closing Date with the same effect as though such representation and warranty
had been made on and as of that date.

          6.2  Performance.  PixTech shall have performed and complied with all
               -----------
agreements and conditions contained in this Agreement required to be performed
or complied with by PixTech prior to or at the Closing.

          6.3  Opinion of Counsel.  UMC shall have received an opinion from
               ------------------


<PAGE>   7


Palmer & Dodge LLP, counsel to PixTech, dated as of the Closing Date, addressed
to UMC, and substantially in the form attached hereto as Exhibit A.
                                                         ---------

          6.4  Closing of European Offering.  The European Offering shall have
               ----------------------------
closed.

          6.5  Certificates and Documents.  PixTech shall have delivered to
               --------------------------
counsel to UMC:

          (a) a certificate of the Secretary or Assistant Secretary of PixTech
dated as of the Closing Date, certifying as to (i) the incumbency of officers of
PixTech executing this Agreement and all other documents executed and delivered
in connection herewith, (ii) a copy of the By-Laws of PixTech, as in effect on
and as of the Closing Date, and (iii) a copy of the resolutions of the Board of
Directors of PixTech authorizing and approving PixTech's execution, delivery and
performance of this Agreement, all matters in connection with this Agreement,
and the transactions contemplated thereby.

          (b) a certificate, executed by the President of PixTech as of the
Closing Date, certifying to the fulfillment of all of the conditions to UMC's
obligations under this Agreement, as set forth in this Section 6.

          6.6  Other Matters.  All corporate and other proceedings in connection
               -------------
with the transactions contemplated at the Closing by this Agreement, and all
documents and instruments incident to such transactions, shall be reasonably
satisfactory in substance and form to UMC and its counsel, and UMC and its
counsel shall have received all such counterpart originals or certified or other
copies of such documents as they may reasonably request.

     SECTION 7.  Conditions to the Obligations of PixTech.
                 ----------------------------------------

          The obligations of PixTech under this Agreement are subject to the
fulfillment, or the waiver by PixTech, of the conditions set forth in this
Section 7 on or before the Closing Date.

          7.1 Accuracy of Representations and Warranties. Each representation
               ------------------------------------------
and warranty of UMC contained in this Agreement shall be true on and as of the
Closing Date with the same effect as though such representations and warranties
had been made on and as of that date.

          7.2  Performance.  UMC shall have performed and complied with all
               -----------
agreements and conditions contained in this Agreement required to be performed
or complied with by UMC prior to or at the Closing.

     SECTION 8.  Survival of Representations, Warranties and Agreements;
                 -------------------------------------------------------
Assignability of Rights.  Notwithstanding any investigation made by any party to
- -----------------------
this Agreement, all covenants, agreements, representations and warranties made
by PixTech and UMC herein, except as otherwise provided herein, shall survive
the execution of this Agreement, the delivery to UMC of the Shares being
purchased and the payment therefor. Except as otherwise provided herein, (i) the
covenants, agreements, representations and warranties of the Company made herein
shall bind the Company's successors and assigns and shall insure to the benefit
of UMC's successors and assigns and (ii) the covenants, agreements,
representations and warranties of UMC made herein shall bind UMC's successors
and assigns and shall insure to the benefit of PixTech's successors and assigns.

     SECTION 9.  Registration Rights.
                 -------------------


<PAGE>   8


          9.1  Registration of Shares.  PixTech covenants and agrees that it
               ----------------------
will:

               (a) promptly following the Closing, prepare and file a
          registration statement on one or more Forms S-3 covering the resale of
          the Shares by UMC (or, if PixTech is not then eligible to use such
          Form, on any other form of registration statement promulgated by the
          SEC which would cover the resale of the Shares), and use its best
          efforts to cause such registration statement to become effective in
          order that UMC may sell its Shares in accordance with the proposed
          plan of distribution;

               (b) prepare and file with the Securities and Exchange Commission
          such amendments and supplements to such registration statement(s) and
          the prospectus used in connection therewith as may be necessary to
          keep such registration statement effective and to comply with the
          provisions of the Securities Act with respect to the resale of the
          Shares covered by such registration statement(s) until such time as
          UMC no longer holds any of the Shares;

               (c) furnish UMC such number of copies of such prospectus as it
          may reasonably request in order to facilitate the resale of the
          Shares;

               (d) file documents required of PixTech for blue sky clearance in
          states specified in writing by UMC; provided, however, that PixTech
          shall not be required to qualify to do business or consent to service
          of process in any jurisdiction in which it is now not so qualified or
          has not so consented; and

               (e) bear all expenses in connection with the procedures set forth
          in paragraphs (a) through (d) of this Section 9 and the registration
          of the Shares pursuant to the registration statement, other than fees
          and expenses, if any, of counsel or other advisors to UMC.

          9.2  Indemnification.  For the purpose of this Section 9.2,
               ---------------

               (a) the term "Selling Stockholder" shall mean UMC and any
          officer, director, employee, agent, affiliate or person deemed to be
          in control of UMC within the meaning of Section 15 of the Securities
          Act or Section 20 of the Exchange Act;

               (b) the term "Registration Statement" shall mean any final
          prospectus, exhibit, supplement or amendment included in or relating
          to the registration statement referred to in Section 9.1; and

               (c) the term "untrue statement" shall mean any untrue statement
          or alleged untrue statement of, or any omission or alleged omission to
          state, in the Registration Statement a material fact required to be
          stated therein or necessary to make the statements therein, in the
          light of the circumstances under which they were made, not misleading.

     PixTech agrees to indemnify and hold harmless each Selling Stockholder from
and against any losses, claims, damages or liabilities to which such Selling
Stockholder may become subject (under the Securities Act or otherwise) insofar
as such losses, claims, damages or liabilities (or actions or proceedings in
respect thereof) arise out of, or are based upon, any untrue statement of a
material fact contained in the Registration Statement on the effective date
thereof, or arise out of any failure by PixTech to fulfill any undertaking
included in the Registration Statement and PixTech will reimburse such Selling
Stockholder for any reasonable legal or other expenses reasonably incurred in
investigating, defending or preparing to defend any such action, proceeding or


<PAGE>   9


claim; provided, however, that PixTech shall not be liable in any such case to
       --------  -------
the extent that such loss, claim, damage or liability arises out of, or is based
upon, an untrue statement made in such Registration Statement in reliance upon
and in conformity with written information furnished to PixTech by or on behalf
of such Selling Stockholder specifically for use in preparation of the
Registration Statement, or any statement or omission in any Prospectus that is
corrected in any subsequent Prospectus that was delivered to UMC prior to the
pertinent sale or sales by UMC.

     UMC agrees to indemnify and hold harmless PixTech (and each person, if any,
who controls PixTech within the meaning of Section 15 of the Securities Act,
each officer of PixTech who signs the Registration Statement and each director
of PixTech) from and against any losses, claims, damages or liabilities to which
PixTech (or any such officer, director or controlling person) may become subject
(under the Securities Act or otherwise), insofar as such losses, claims, damages
or liabilities (or actions or proceedings in respect thereof) arise out of, or
are based upon, any untrue statement of a material fact contained in the
Registration Statement on the effective date thereof if such untrue statement
was made in reliance upon and in conformity with written information furnished
by or on behalf of UMC specifically for use in preparation of the Registration
Statement, and UMC will reimburse PixTech (or such officer, director or
controlling person, as the case may be), for any legal or other expenses
reasonably incurred in investigating, defending, or preparing to defend any such
action, proceeding or claim; provided, however, that UMC shall not be liable for
                             --------  -------
any statement or omission in any Prospectus that is corrected in any subsequent
Prospectus that was delivered to UMC prior to the pertinent sale or sales by
UMC.

     Promptly after receipt by any indemnified person of a notice of a claim or
the commencement of any action in respect of which indemnity is to be sought
against an indemnifying person pursuant to this Section 9.2, such indemnified
person shall notify the indemnifying person in writing of such claim or of the
commencement of such action, and, subject to the provisions hereinafter stated,
in case any such action shall be brought against an indemnified person and such
indemnifying person shall have been notified thereof, such indemnifying person
shall be entitled to participate therein, and, to the extent it shall wish, to
assume the defense thereof, with counsel reasonably satisfactory to such
indemnified person; provided, however, that the indemnifying person shall not
                    --------  -------
agree to a settlement of any such action without the consent of the indemnified
person, which consent shall not be unreasonably withheld. After notice from the
indemnifying person to such indemnified persons of its election to assume the
defense thereof, such indemnifying person shall not be liable to such
indemnified person for any legal expenses subsequently incurred by such
indemnified person in connection with the defense thereof; provided, however,
                                                           --------  -------
that if there exists or shall exist a conflict of interest that would make it
inappropriate, in the opinion of counsel to the indemnified person, for the same
counsel to represent both the indemnified person and such indemnifying person or
any officer, director, employee, agent, affiliate or person deemed to be in
control of such indemnifying person within the meaning of either Section 15 of
the Securities Act or Section 20 of the Exchange Act, the indemnified person
shall be entitled to retain its own counsel at the expense of such indemnifying
person. It is understood, however, that PixTech shall, in connection with any
one such action, suit or proceeding or separate but substantially similar or
related actions, suits, or proceedings in the same jurisdiction arising out of
the same general allegations or circumstances, be liable for the reasonable fees
and expenses of only one separate firm of attorneys (in addition to any local
counsel) at any time for all such indemnified parties not having actual or
potential differing interests with PixTech or among themselves.

          9.3  "Stand-Off" Agreement.  If UMC holds any Shares at such time as
               ---------------------


<PAGE>   10


PixTech proposes, at any time after the Closing Date, to offer shares of its
Common Stock or other securities for sale in a registered underwritten public
offering, then UMC agrees not to sell or otherwise transfer or dispose of any
such Shares or other securities of PixTech held by it during the period
commencing 10 days prior to, and expiring 180 days after, such registered public
offering has become effective, provided, that all executive officers and
directors of PixTech enter into similar agreements. PixTech may impose stop
transfer instructions with respect to the Shares or other securities subject to
the foregoing restriction until the end of any stand-off period.

          9.4  Termination.  UMC's registration rights hereunder shall terminate
               -----------
as to any Shares upon the earlier of (i) three years after the Closing Date or
(ii) such time as no such Shares are held by UMC.

     SECTION 10.  Miscellaneous.
                  -------------

          10.1 Notices. Any consent, notice or report required or permitted to
               -------
be given or made under this Agreement by one of the parties hereto to the other
shall be in writing, delivered personally or by facsimile (and promptly
confirmed by telephone, personal delivery or courier) or courier, postage
prepaid (where applicable), addressed to such other party at its address
indicated below, or to such other address as the addressee shall have last
furnished in writing to the addressor and shall be effective upon receipt by the
addressee.

     If to PixTech:  PixTech, Inc.
                     Avenue Olivier Perroy
                     Zone Industrielle de Rousset
                     13790 Rousset France
                     Telephone:  011 334 4229 1000
                     Telecopy:   011 334 4229 0509

     with a copy to: Palmer & Dodge LLP
                     One Beacon Street
                     Boston, Massachusetts 02108
                     Attention:  Michael Lytton, Esq.
                     Telephone:  (617) 573-0100
                     Telecopy:  (617) 227-4420

     If to UMC:      United Microelectronic Corp.
                     2F, No. 76 Sec 2, Tunhwa S. Rd.
                     Taipei, Taiwan, R.O.C.
                     Attn:  Stan Hung
                     Telephone:  886-2-7006999, ext. 6966.6911
                     Telecopy:   886-2-7033839

    with a copy to:  Peter J. Courture, Esq.
                     Law +
                     993 Highland Circle
                     Los Altos, California  94024
                     Telephone: (415) 968-8855
                     Telecopy:  (415) 968-8885

          10.2 Entire Agreement.  This Agreement contains the entire
               ----------------
understanding of the parties with respect to the subject matter hereof and
supersedes the Letter of Intent dated January 9, 1997 addressed to PixTech by
UMC. All express or implied agreements and understandings, either oral or
written, heretofore made are expressly merged in and made a part of this
Agreement.

          10.3 Assignment.  Neither this Agreement nor any of the rights and
               ----------


<PAGE>   11


obligations contained herein may be assigned or otherwise transferred by either
party without the consent of the other party; provided, however, that either
PixTech or UMC may, without such consent, assign its rights and obligations
under this Agreement (i) to any Affiliate, all or substantially all of the
equity interest of which is owned and controlled by such party or its direct or
indirect parent corporation, or (ii) in connection with a merger, consolidation
or sale of substantially all of such party's assets to an unrelated third party;
provided, however, that such party's rights and obligations under this Agreement
shall be assumed by its successor in interest in any such transaction and shall
not be transferred separate from all or substantially all of its other business
assets, including those business assets. Any purported assignment in violation
of the preceding sentence shall be void. Any permitted assignee shall assume all
obligations of its assignor under this Agreement.

          10.4 Amendments and Waivers.  This Agreement may not be modified or
               ----------------------
amended except pursuant to an instrument in writing signed by PixTech and UMC.
The waiver by either party hereto of any right hereunder or the failure to
perform or of a breach by the other party shall not be deemed a waiver of any
other right hereunder or of any other breach or failure by said other party
whether of a similar nature or otherwise.

          10.5 Headings.  The headings of the various sections of this Agreement
               --------
have been inserted for convenience of reference only and shall not be deemed to
be part of this Agreement.

          10.6 Severability.  In case any provision contained in this Agreement
               ------------
should be invalid, illegal or unenforceable in any respect, the validity,
legality and enforceability of the remaining provisions contained herein shall
not in any way be affected or impaired thereby.

          10.7   Governing Law.  This Agreement shall be governed by and
                 -------------
construed in accordance with the laws of the State of Delaware (without giving
effect to the choice of law provisions thereof) and the federal law of the
United States of America.

          10.8   Counterparts.  This Agreement may be executed in two or more
                 ------------
counterparts, each of which shall constitute an original, but all of which, when
taken together, shall constitute but one instrument, and shall become effective
when one or more counterparts have been signed by each party hereto and
delivered to the other parties.

          10.9   Expenses.  Except as otherwise specifically provided herein,
                 --------
each party shall bear its own expenses in connection with this Agreement.

          10.10  Publicity.  Neither party hereto shall issue any press releases
                 ---------
or otherwise make any public statement with respect to the transactions
contemplated by this Agreement without the prior written consent of the other
party, except as may be required by applicable law or regulation.

          10.11  Confidentiality.  UMC acknowledges and agrees that any
                 ---------------
information or data it has acquired from PixTech, not otherwise properly in the
public domain, was and will be treated pursuant to the confidentiality
provisions of the Memorandum of Understanding between Unipac Optoelectronics
Corp. and PixTech.


<PAGE>   12


            [The remainder of this page is intentionally left blank]

     IN WITNESS WHEREOF, the parties hereto have caused this Common Stock
Purchase Agreement to be executed by their duly authorized representatives as of
the day and year first above written.

PIXTECH, INC.

By:   /s/ Jean-Luc Grand-Clement
     -------------------------------
     Jean-Luc Grand-Clement
     President and Chief Executive Officer

UNITED MICROELECTRONIC CORP.

By:  /s/ Robert Tsao
   ------------------------------------------

Title:   Chairman
      ---------------------------------------



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