SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


Date of report (Date of earliest event reported): April 4, 2005 (March 30, 2005)
                                                  ------------------------------


                          Universal Display Corporation
                 -----------------------------------------------
                 (Exact Name of Registrant Specified in Charter)

         Pennsylvania                      1-12031              23-2372688
-------------------------------          ------------       -------------------
(State or Other Jurisdiction of          (Commission         (I.R.S. Employer
        Incorporation)                   File Number)       Identification No.)

         375 Phillips Boulevard
           Ewing, New Jersey                                       08618
----------------------------------------                  ---------------------
(Address of Principal Executive Offices)                         (Zip Code)


       Registrant's telephone number, including area code: (609) 671-0980
                                                           --------------

Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2 below):

[_]  Written communications pursuant to Rule 425 under the Securities Act (17
     CFR 230.425)

[_]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
     240.14a-12)

[_]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))

[_]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4(c))





ITEM 1.01   ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT.

         On March 30, 2005, the Registrant entered into a Sixth Amendment to its
Development and License Agreement with PPG Industries, Inc. Under that
agreement, a team of PPG Industries' scientists and engineers assists the
Registrant in developing and commercializing various materials for use in
organic light emitting devices (OLEDs). PPG Industries also supplies the
Registrant with OLED materials that it qualifies and resells for evaluation
purposes.

         The Sixth Amendment amends the Development and License Agreement with
regard to the date of expiration of that Agreement. The amendment also modifies
the Development and License Agreement with regard to the timing of the
Registrant's issuance to PPG Industries and registration for resale by PPG
Industries of shares of the Registrant's common stock that will be issued to PPG
Industries in partial consideration of the work performed by PPG Industries
under the agreement.














                                      -2-



                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                                UNIVERSAL DISPLAY CORPORATION


                                                By: /s/ Sidney D. Rosenblatt
                                                    --------------------------
                                                    Sidney D. Rosenblatt
                                                    Executive Vice President,
                                                    Chief Financial Officer,
                                                    Treasurer and Secretary



Dated: April 4, 2005













                                       -3-