Justin W. Chairman                                  Morgan, Lewis & Bockius LLP
215-963-5061
jchairman@morganlewis.com


March 21, 2005

VIA EDGAR AND OVERNIGHT COURIER

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC 20549
Attn: Barbara C. Jacobs, Esquire
Assistant Director, Division of Corporation Finance

Re:   Universal Display Corporation
      Registration Statement on Form S-3 -- File No. 333-120737
      ---------------------------------------------------------

Dear Ms. Jacobs:

This letter is being submitted in response to the comments given by the staff of
the Division of Corporation Finance of the Securities and Exchange Commission
(the "Commission") as set forth in your letter to Steven V. Abramson, President
and Chief Operating Officer of Universal Display Corporation (the "Company"),
dated February 24, 2005, with respect to the above-referenced registration
statement (the "Registration Statement"). We have been authorized by the Company
to provide the responses contained in this letter on behalf of the Company.

Where indicated below, requested changes have been included in Amendment No. 2
to the Registration Statement ("Amendment No. 2"), which is being filed
contemporaneously with this response.

For your convenience, we set forth each comment in italicized typeface and
include each response below the relevant comment.

GENERAL

1.    In future amendments of your Form S-3 consider the consider the age of
      financial statements requirements of Rules 3-01(c) and 3-12(b) of
      Regulation S-X.

      The Company notes the Staff's comment. The Company advises the Staff that
      the Company's Annual Report on Form 10-K for the year ended December 31,
      2004, containing the financial statements of the Company as of and for the
      year ended December 31, 2004, was filed with the Commission on March 14,
      2005 and is incorporated by reference in the Registration Statement.

2.    We continue to review your requests for confidential treatment. Any
      comments we may have will follow promptly. You will need to resolve any
      such comments before you can be declared effective on the above
      registrations statement.

      The Company notes the Staff's comment.

3.    Prior comment 2. Your response does not address our concern that PPG
      appears to maintain discretion in determining the number of shares it will
      acquire. We continue to refer you to Articles 10.1 and 10.2 to the
      Development and License Agreement, which you did not address in your
      response. In order to register the resale of securities that have not yet
      been issued, the investor must be irrevocably bound to purchase a set
      number of securities for a set purchase price that is not based on market
      price or a fluctuating ratio, either at the time of effectiveness of the
      resale registration statement or at any subsequent date. See Telephone
      Interpretation 3S to the March 1999 supplement to the Telephone
      Interpretations Manual. We disagree with your assertion that because the





Securities and Exchange Commission
March 21, 2005
Page 2


      consideration in your transaction is services as part of a commercial
      relationship, offering completion analysis is not pertinent. Please
      provide us with your analysis as to why PPG is "irrevocably bound" to
      purchase a set number of securities within the meaning of 3S.

      Amendment No. 2 reflects the fact that the Registration
      Statement has been amended so that it no longer seeks to register the
      resale of any shares for PPG Industries. Thus, while the Company will
      consider the Staff's comment in connection with any future registration
      statement it might file to register the resale of shares issued to PPG
      Industries, it is not addressing the comment in connection with the filing
      of Amendment No. 2.

4.    Furthermore, we note your response to prior comment 2 that on December 22,
      2004, the Company and PPG Industries entered into a fifth amendment, which
      modifies certain aspects of how the number of shares of common stock
      delivered to PPG with respect to any given period is calculated. Please
      provide your analysis as to why you believe that at the date the
      registration statement was initially filed, PPG was "irrevocably bound to
      purchase a set number of securities for a set purchase price" as set forth
      in Telephone Interpretation 3S. Furthermore, please provide us with a
      detailed analysis as to why the renegotiation of the terms of the security
      should not be viewed as a separate transaction conducted without
      registration and whether this transaction should be part of a single
      transaction that includes the public resales. What consideration, if any,
      have you given to the potential consequences to the company and its
      shareholders as a result of the conduct of the unregistered transaction
      while your registration statement for the public resales was on file?

      Please see the response to Comment #3.

5.    Prior comment 3. We note your response that pursuant to the fifth
      amendment to the development and license agreement, issuances of 560,000
      shares will be made to PPG on a quarterly basis in installments in each of
      April 2005, July 2005, October 2005 and January 2006. We further note that
      you expect to issue 36,000 of the shares registered for resale by Motorola
      in March 2005. As we stated previously, where the parties are not
      contractually required to close promptly following the effective date, we
      view the parties as retaining discretion as to material terms of the
      proposed investments and more specifically with respect to the closing
      dates. Accordingly, it appears that you are not eligible to register the
      resale of these shares on this registration statement at this time. Please
      remove these shares from your registration statement.

      Please see the response to Comment #3. Additionally, the Company notes
      that Amendment No. 2 reflects the fact that the Registration Statement has
      been amended so that it no longer seeks to register the resale of the
      referenced 36,000 shares issuable to Motorola. Thus, while the Company
      will consider the Staff's comment in connection with any future
      registration statement it might file to register the resale of shares
      issued to Motorola, it is not addressing the comment in connection with
      the filing of Amendment No. 2.




Securities and Exchange Commission
March 21, 2005
Page 3


6.    In consideration of the above comments, please provide us with your
      analysis as to why it is appropriate to register the resale of these
      shares on this form at this time. Specifically, tell us the transaction
      requirement you satisfy for each transaction. To the extent the
      transaction requirement you are relying on requires that the shares are
      "outstanding," please explain why you believe the shares in each
      transaction "outstanding."

      Please see the responses to Comments #3 and #5.

SELLING SHAREHOLDERS

7.    Prior comment 5. Your registration statement continues to lack a
      materially complete description of the issuance to Motorola and the
      Warrant Agreements with Mssrs. Seligsohn and the other remaining selling
      shareholders which are "material relationships" within the meaning of Item
      507 of Regulation S-K. An understanding of these material relationships is
      necessary to understand the nature of the transaction you propose and the
      plan of distribution. Please expand your disclosure to describe the terms
      of the license agreement between the company and Motorola. Also, describe
      the terms of the "certain warrants" held by Mssrs. Seligsohn and the
      "other selling shareholders." Please note, we are unable to locate the
      license agreement with Motorola which you state you filed as an exhibit to
      your registration statement.

      The disclosure requested by the Staff in Comment #7 has been added on page
      18 of the prospectus. The Company notes that as amended, the Registration
      Statement no longer seeks to register sales of shares issuable to Motorola
      under the referenced license agreement, and therefore no discussion of
      said agreement has been included in Amendment No. 2. However, the Company
      confirms for the Staff that such license agreement is filed as Exhibit
      10.1 to the Company's Quarterly Report on Form 10-Q for the fiscal quarter
      ended September 30, 2000, as amended.

8.    Prior comment 7. Please disclose whether Dillon Capital LLC acquired its
      shares in the ordinary course of business and whether, at the time of the
      purchase of the securities to be resold, the seller had any agreements,
      plants or understandings, directly or indirectly, with any person to
      distribute the securities.

      To the Company's knowledge, after inquiry of Dillon Capital, LLC, Dillon
      Capital, LLC received its warrant as compensation for the performance of
      investment banking or similar services in the ordinary course of its
      business, and at the time it received the warrant, Dillon Capital, LLC had
      no agreements, plans or understandings, directly or indirectly, with any
      person to distribute the warrant or the shares of Common Stock issuable
      upon the exercise thereof. Disclosure in this regard has been added on
      page 19 of the prospectus.

Please do not hesitate to contact the undersigned at 215-963-5061 if you should
have any questions or comments with regard to these responses.

Very truly yours,

/s/ Justin W. Chairman

Justin W. Chairman

cc:    Mr. Steven V. Abramson
       Scott C. Bovino, Esquire