EXHIBIT 23.1
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                           Morgan, Lewis & Bockius LLP
                               1701 Market Street
                             Philadelphia, PA 19103

December 10, 2001

Universal Display Corporation
375 Phillips Boulevard
Ewing, NJ  08618

Re:   Universal Display Corporation
      Registration Statement on Form S-3 Relating to the
      Registration of 2,147,460 shares of Common Stock, $.01 par value
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Ladies and Gentlemen:

We have acted as counsel to Universal Display Corporation, a Pennsylvania
corporation (the "Company"), in connection with the preparation of the
above-referenced Registration Statement on Form S-3 (the "Registration
Statement") to be filed with the Securities and Exchange Commission pursuant to
the Securities Act of 1933, as amended (the "Act"), and the rules and
regulations promulgated thereunder, relating to 2,147,460 shares (the "Shares")
of the Company's common stock, par value $.01 per share (the "Common Stock"), to
be sold by the selling shareholders named in the Registration Statement (the
"Selling Shareholders").

The Shares consist of shares of Common Stock that are issuable upon the
conversion of promissory notes, each dated as of August 22, 2001, and in the
aggregate principal amount of $15 million (collectively, the "Notes").

In rendering the opinion set forth below, we have examined the Registration
Statement and the exhibits thereto, certain records of the Company's corporate
proceedings as reflected in its minute books and such statutes, records and
other documents as we have deemed relevant. In our examination, we have assumed:
(i) that the Shares will be issued in accordance with the terms of the Notes;
and (ii) the genuineness of documents submitted to us as originals and the
genuineness of, and conformity with, the original of all documents submitted to
us as copies thereof.

Based upon the foregoing, we are of the opinion that the Shares issuable upon
the conversion of the Notes are duly authorized and, when issued in accordance
with the terms of the Notes, will be validly issued, fully paid and
non-assessable.


The opinion set forth above is limited to the laws of the Commonwealth of
Pennsylvania. We hereby consent to the use of this opinion as an exhibit to the
Registration Statement and further consent to the reference to our firm under
the caption "Legal Opinion" in the prospectus included in the Registration
Statement. In giving such consent, we do not thereby admit that we are acting
within the category of persons whose consent is required under section 7 of the
Act or the rules or regulations of the Securities and Exchange Commission
thereunder.


Very truly yours,

/s/ Morgan, Lewis & Bockius LLP
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