Morgan, Lewis & Bockius LLP
                                                               Counselors at Law

1701 Market Street
Philadelphia, PA 19103-2921
215-963-5000
Fax: 215-963-5299

Justin W. Chairman
215-963-5061
e-mail: jchairman@morganlewis.com

                                                     June 23, 2005

VIA EDGAR AND OVERNIGHT COURIER
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.  20549
Attn: Mark P. Shuman, Esquire
Branch Chief-Legal, Division of Corporation Finance

Re:      Universal Display Corporation
         Registration Statement on Form S-3 -- File No. 333-124306
         ---------------------------------------------------------

Dear Mr. Shuman:

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 May 19, 2005, with respect to the above-referenced registration statement
(the "Registration Statement"), as well as to the Company's Registration
Statement on Form S-3 (File No. 333-120737). 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. 1
to the Registration Statement ("Amendment No. 1"), 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.   Please include disclosure in both Forms S-3 regarding the other pending
     offering. To put the cover page references to the secondary distribution in
     each prospectus in an appropriate context, this information about the
     concurrent secondary offering under the other filing should be included.

     A section entitled "Concurrent Offering," which contains information
     regarding the other pending offering, has been added to the prospectus.

WHERE YOU CAN FIND MORE INFORMATION

2.   We note that you filed your form 10-Q for the quarter ended March 31, 2005
     after filing registration statement number 333-124306 and that you have
     additionally filed two Forms 8-K since filing the last amendment to
     registration statement number 333-120737. Please revise you filings to
     update this section accordingly and ensure that any future filings that are
     required to be incorporated by reference are properly reflected prior to
     effectiveness. See Interp. H.69 of the July 1997 CF Manual of Publicly
     Available Telephone Interpretations.




     In accordance with the Staff's comment, Amendment No. 3 incorporates by
     reference the Company's Quarterly Report on Form 10-Q and two Current
     Reports on Form 8-K referenced by the Staff. In addition, the Company has
     included in Amendment No. 3 the language referenced in Interp. H.69
     regarding the incorporation by reference of additional filings the Company
     makes under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange
     Act of 1934, as amended, made between the date of the initial registration
     and prior to the effectiveness of the registration statement. In accordance
     with Interp. H.69, following effectiveness the Company will file, pursuant
     to Rule 424(b) under the Securities Act of 1933, as amended, a prospectus
     identifying any such filings and removing the statement referenced above.

PENDING REVIEW OF CONFIDENTIAL TREATMENT REQUESTS

3.   We note that there are currently two pending confidential treatment
     requests regarding Company documents. Please be advised that your
     registration statements will not be declared effective until all issues on
     such confidential treatment requests have been resolved. Additionally,
     please ensure that registration statement number 333-124306 is updated to
     include the revised version of Exhibit 10.6.

     The Company notes the Staff's comment. The Registration Statement has been
     updated as per the Staff's request.

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:  Sara Kalin, Esquire
     Mr. Steven V. Abramson
     Scott C. Bovino, Esquire