SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934


                          Universal Display Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.01 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    91347P105
                              --------------------
                                 (CUSIP Number)

                                February 25, 2003
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [   ]    Rule 13d-1(b)
         [ X ]    Rule 13d-1(c)
         [   ]    Rule 13d-1(d)

*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 the
disclosures provided in a prior cover page.

The information required in 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).





                                  SCHEDULE 13G
                              CUSIP NO. 91347P105


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

         PPG Industries, Inc.                        25-0730780
         -----------------------------------------------------------------------

2. Check the Appropriate Box if a Member of a Group

         (a)
                  ------
         (b)
                  ------

3.       SEC Use Only
                                   ---------------------------------------------

4. Citizenship or Place of Organization                          Pennsylvania
                                                                 ---------------

Number of         5.       Sole Voting Power                     1,131,088
Shares                                                           ---------------
Beneficially      6.       Shared Voting Power                           0
Owned by                                                         ---------------
Each Reporting    7.       Sole Dispositive Power                1,131,088
Person                                                           ---------------
With:             8.       Shared Dispositive Power                      0
                                                                 ---------------

9.       Aggregate Amount Beneficially Owned by Each Reporting Person

         1,131,088
         ----------------

10.      Check if the Aggregate Amount in Row (9) Excludes Certain
         Shares
                           --------


11. Percent of Class Represented by Amount in Row (9)

                                                                        5.1%
                                                                        --------

12. Type of Reporting Person                                            CO
                                                                        --------


                               Page 2 of 6 Pages



                                  SCHEDULE 13G
                              CUSIP NO. 91347P105


Item 1.

         (a)      Name of Issuer

                  Universal Display Corporation
                  --------------------------------------------------------------

         (b)      Address of Issuer's Principal Executive Offices

                  375 Phillips Boulevard, Ewing, New Jersey 08618
                  --------------------------------------------------------------


Item 2.

         (a)      Name of Persons Filing

                  PPG Industries, Inc.
                  --------------------------------------------------------------

         (b)      Address of Principal Business Office or, if none, Residence

                  One PPG Place, Pittsburgh, PA  15272
                  --------------------------------------------------------------

         (c)      Citizenship

                  Pennsylvania
                  --------------------------------------------------------------

         (d)      Title of Class of Securities

                  Common Stock, $0.01 par value
                  --------------------------------------------------------------

         (e)      CUSIP Number

                  91347P105
                  --------------------------------------------------------------



                               Page 3 of 6 Pages


                                  SCHEDULE 13G
                              CUSIP NO. 91347P105



Item 3.        If this  statement is filed  pursuant  toss.ss.  240.13d-1(b)  or
               240.13d-2(b) or (c), check whether the person filing is a:

     (a)       [ ]  Broker of dealer registered under section 15 of the Act;

     (b)       [ ]  Bank as defined in section 3(a)(6) of the Act;

     (c)       [ ]  Insurance company as defined in section 3(a)(19) of the Act;

     (d)       [ ]  Investment   company  registered  under  section  8  of  the
                    Investment Company Act of 1940;

     (e)       [ ]  An investment adviser in accordance with ss. 240.13d-1(b)(l)
                    (ii)(E);

     (f)       [ ]  An employee  benefit  plan or endowment  fund in  accordance
                    with ss. 240.13d-1(b)(1)(ii)(F);

     (g)       [ ]  A parent  holding  company or control  person in  accordance
                    with ss. 240.13d-1(b)(1)(ii)(G);

     (h)       [ ]  A savings  association  as defined  in  Section  3(b) of the
                    Federal Deposit Insurance Act;

     (i)       [ ]  A church plan that is  excluded  from the  definition  of an
                    investment  company under section 3(c)(14) of the Investment
                    Company Act of 1940;

     (j)       [ ]  Group, in accordance with ss. 240.13d- 1((b)(l)(ii)(J)


Item 4.  Ownership


         (a) Amount beneficially owned:

             1,131,088 shares of Common Stock, $0.01 par value
             -------------------------------------------------------------------

         (b) Percent of class: 5.1%
                             --------

                               Page 4 of 6 Pages




                                  SCHEDULE 13G
                              CUSIP NO. 91347P105


         (c) Number of shares as to which the person has:

             (i)   Sole power to vote or direct the vote:              1,131,088
                                                                     -----------
             (ii)  Shared power to vote or direct the vote:                    0
                                                                     -----------
             (iii) Sole power to dispose of or direct the
                   disposition of:                                     1,131,088
                                                                     -----------

             (iv)  Shared power to dispose of or direct the
                   disposition of:                                             0
                                                                     -----------


Item 5.   Ownership of Five Percent or Less of a Class


          If this  statement  is being  filed to report  the fact that as of the
date hereof,  the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following: ----------

Item 6.   Ownership of More than Five Percent on Behalf of Another Person

          Not applicable.

Item 7.   Identification and Classification of the Subsidiary Which Acquired the
          Security Being  Reported on By the Parent  Holding  Company or Control
          Person

          Not applicable.

Item 8.   Identification and Classification of Members of the Group

          Not applicable.

Item 9.  Notice of Dissolution of Group

         Not applicable.





                                  SCHEDULE 13G
                              CUSIP NO. 91347P105



Item 10.  Certification


          By  signing  below I certify  that,  to the best of my  knowledge  and
belief, the securities  referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing  the control of the
issuer of the  securities  and were not acquired and are not held in  connection
with or as a participant in any transaction having that purpose or effect.


                                    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.


                                        PPG INDUSTRIES, INC.


                                              March 6, 2003
                                        ----------------------------------------
                                                  Date


                                              /s/ William H. Hernandez
                                        ----------------------------------------
                                                    Signature


                                              William H. Hernandez
                                              Senior Vice President, Finance
                                       -----------------------------------------
                                                    Name/Title





                               Page 6 of 6 Pages