Amendment Number 1, Dated July 4, 2006, To The Contract Research Agreement

Exhibit 10.19.1

CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS OF THIS DOCUMENT HAVE BEEN REDACTED AND HAVE BEEN SEPARATELY FILED WITH THE COMMISSION.

Amendment Number 1 to the Research Agreement and Licence Agreement

Amendment Number 1 dated July 4, 2006 (" Effective Date" ) between Cambridge Display Technology Limited of Building 2020, Cambourne Business Park, Cambridgeshire, CB3 6DW (" CDT" ) and Merck OLED Materials GmbH (formerly known as Covion Organic Semiconductors GmbH) of Industriepark Hoechst, Gebe4ude F821, D-65926, Frankfurt am Main, Germany (" MOM" ).

WHEREAS A. In order to conduct specific research and development on behalf of MOM in the field of organic semiconductor technology, CDT International Limited of PO Box HM1556, Corner House Church, Parliament Street, Hamilton HMFX, Bermuda (" CDT International" ) and MOM entered into a Contract Research Agreement dated 14 December 2001 (the " Research Agreement" ). B. The rights and obligations of CDT International under the Research Agreement were novated to CDT in March 2003. C. Following discussions concerning the Research Agreement and in order to clarify certain terms in the Research Agreement, MOM and CDT (together the " Parties" ) entered into a side letter to amend the terms of the Research Agreement on 7 October 2004 (" CRA Side Letter" ).

D. CDT and MOM entered into a Patent and Know-How Licence agreement dated 14 December 2001 (the " Licence Agreement" ). E. Following discussions concerning the Licence Agreement and in order to clarify certain terms in the Licence Agreement, the Parties entered into a side letter dated 7 October 2004 to amend the terms of the Licence Agreement (" Licence Side Letter" ).

F. The Parties wish to amend the Research Agreement and Licence Agreement in the terms in the manner set out below G. Terms used but not defined herein shall have the meaning given to them in the Licence Agreement or the Licence Side Letter. NOW, THEREFORE, the parties agree as follows:

1. Termination of the Research Agreement

1.1. Notwithstanding the terms of Clause 11 of the Research Agreement, the Parties agree to terminate the Research Agreement and that such termination shall be deemed to have been effective from 1 June 2005 (" Termination Date" ). Each Party releases the other from all claims, liens, demands, causes of action, obligations, damages and liabilities arising directly as a result of the termination of the Research Agreement. 1.2. The Parties hereby agree that MOM will have no further royalty obligation to CDT under Clause 4 of the Research Agreement after the Termination Date, but for the avoidance of doubt, MOM will continue to pay royalties to CDT pursuant to clause 11 of Licence Agreement.

1.3. It is expressly agreed by MOM that:

(a). of the unpublished patent applications and invention disclosures set out in Annexe 1 hereto together with any patents and/or patent applications within CDT' s control which were published as at 1 December 2005, no other patents or inventions fall within the definition of Future Patents; and

(b). MOM' s right to any inventions made after 1 December 2005 is governed solely by the terms of this Amendment No 1. 1.4. MOM reserves the right to assert that any patent and/or patent application in respect of an invention made by an employee of CDT prior to 1 June 2005, which was not either (1) published as at 1 December 2005 or (2) listed in Annexe 1, is a Future Patent. If any such assertion is made by MOM, the Parties shall use all reasonable endeavours to resolve any question arising from such assertion.

2. Amendment to the Licence Agreement

2.1. The Parties agree that the Licence Agreement shall be amended in the following respects: (a). Add new definitions as follows:

Additional Patents Means the patent/applications set out in Schedule 8 and any and all patents, therefrom, including any continuations, divisionals and reissues of any of the foregoing, or foreign counterparts or equivalents thereof; Supplementa ...