Washington, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1 )*

                        Cambridge Display Technology Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                 (CUSIP Number)

                                December 31, 2007
             (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

                                  SCHEDULE 13G

CUSIP No. 132193103

1.   Names of Reporting Persons. I.R.S. Identification Nos. of above persons
     (entities only).
     Invesco Ltd.
          PowerShares Capital Management LLC
2.   Check the Appropriate Box if a Member of a Group (see Instructions)

     (a) [ ]
     (b) [ ]
3.   SEC Use Only

4.   Citizenship or Place of Organization
     Invesco Ltd.  - Bermuda
          PowerShares Capital Management LLC - US
                     5.   Sole Voting Power: 0 Such shares are held by the
                          following entities in the respective amounts listed:

                          PowerShares Capital Management LLC - 0
                     6.   Shared Voting Power

 Number of Shares         -0-
Beneficially Owned   -----------------------------------------------------------
 by Each Reporting   7.   Sole Dispositive Power: 0 Such shares are held by the
    Person With           following entities in the respective amounts listed:

                          PowerShares Capital Management LLC - 0
                     8.   Shared Dispositive Power

9.   Aggregate Amount Beneficially Owned by Each Reporting Person:

10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares

     (See Instructions) N/A
11.  Percent of Class Represented by Amount in Row (9)

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:

          Cambridge Display Technology Inc.

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

          Building 2020
          Cambourne Business Park
          United Kingdom

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:


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

  (g) [X] A parent holding company or control person in accordance with section

          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 [X]

Item 6    Ownership of More than Five Percent on Behalf of Another Person:


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

Item 8    Identification and Classification of Members of the Group:


Item 9    Notice of Dissolution of a Group:


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.


          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.


                                        Invesco Ltd.

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