UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                               (Amendment No. _ )*

                          Universal Display Corporation
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                                (Name of Issuer)

                                  Common Stock
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                         (Title of Class of Securities)

                                    91347P105
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                                 (CUSIP Number)

                                December 31, 2007
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             (Date of Event Which Requires Filing of this Statement)

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

      [X]   Rule 13d-1(b)

      [ ]   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

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

                PowerShares Capital Management LLC

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      2.    Check the Appropriate Box if a Member of a Group (see Instructions)
            (a)
            (b)

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      3.    SEC Use Only ____________________________________

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      4.    Citizenship or Place of Organization Invesco Ltd. - Bermuda

                PowerShares Capital Management LLC - US

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                        5.    Sole Voting Power 2,647,539: Such shares are held
                              by the following entities in the respective
                              amounts listed:

                                 PowerShares Capital Management LLC - 2,647,539

Number of Shares        --------------------------------------------------------
Beneficially Owned
by Each Reporting       6.    Shared Voting Power -0-
Person With
                        --------------------------------------------------------

                        7.    Sole Dispositive Power 2,647,539: Such shares are
                              held by the following entities in the respective
                              amounts listed:

                                 PowerShares Capital Management LLC - 2,647,539

                        --------------------------------------------------------

                        8.    Shared Dispositive Power -0-

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      9.    Aggregate Amount Beneficially Owned by Each Reporting Person:
            2,647,539

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      10.   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
            (See Instructions) N/A

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      11.   Percent of Class Represented by Amount in Row (9) 7.51%

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      12.   Type of Reporting Person (See Instructions) IA, HC. See Items 2 and
            3 of this statement.



                                  SCHEDULE 13G

Item 1(a)          Name of Issuer:

                   Universal Display Corp

Item 1(b)          Address of Issuer's Principal Executive Offices:

                      375 Phillips Boulevard
                      Ewing, NJ 08618
                      United States

Item 2(a)          Name of Person Filing:

                   Invesco Ltd.

                   In accordance with Securities and Exchange Commission Release
                   No. 34-39538 (January 12, 1998), this statement on Schedule
                   13G or amendment thereto is being filed by Invesco Ltd.
                   ("Invesco"), a Bermuda Company, on behalf of itself and its
                   subsidiaries listed in Item 4 of the cover of this statement.
                   Invesco through such subsidiaries provides investment
                   management services to institutional and individual investors
                   worldwide.

                   Executive officers and directors of Invesco or its
                   subsidiaries may beneficially own shares of the securities of
                   the issuer to which this statement relates (the "Shares"),
                   and such Shares are not reported in this statement. Invesco
                   and its subsidiaries disclaim beneficial ownership of Shares
                   beneficially owned by any of their executive officers and
                   directors. Each of Invesco's direct and indirect subsidiaries
                   also disclaim beneficial ownership of Shares beneficially
                   owned by Invesco and any other subsidiary.

Item 2(b)          Address of Principal Business Office:

                   1360 Peachtree Street NE
                   Atlanta, GA 30309
                   United States

Item 2(c)          Citizenship:

                   See the response to Item 2(a) of this statement.


Item 2(d)          Title of Class of Securities:

                   Common Stock, $.01 par value per share

Item 2(e)          CUSIP Number:

                   91347P105

Item 3             If this statement is filed pursuant to ss240.13d-1(b) or
                   240.13d-2(b) or (c), check whether the person filing is a:

          (e) [x]  An investment adviser in accordance with section
                   240.13d-1(b)(1)(ii)(E)

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

                   As noted in Item 2 above, Invesco is making this filing on
                   behalf of its subsidiaries listed herein. Each of these
                   entities is either an investment adviser registered with the
                   United States Securities and Exchange Commission under
                   Section 203 of the Investment Advisers Act of 1940, as
                   amended, or under similar laws of other jurisdictions.
                   Invesco is a holding company.



Item 4          Ownership:

                Please see responses to Items 5-8 on the cover of this
                statement, which are incorporated herein by reference.

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:

                N/A

Item 7          Identification and Classification of the Subsidiary Which
                Acquired the Security Being reported on By the Parent Holding
                Company:

                Please see Item 3 of this statement, which is incorporated
                herein by reference.

Item 8          Identification and Classification of Members of the Group:

                N/A

Item 9          Notice of Dissolution of a Group:

                N/A

Item 10         Certification:

                By signing below I certify that, to the best of my knowledge
                and belief, the securities referred to above were acquired and
                are held in the ordinary course of business and 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.

                                                   02/09/2008
                                  --------------------------------------------
                                                      Date

                                  Invesco Ltd.

                                  By: /s/ Lisa Brinkley
                                      ----------------------------------------
                                  Lisa Brinkley
                                  Global Compliance Director