Mail Stop 6010


April 25, 2006


David Fyfe, Chief Executive Officer
Cambridge Display Technology, Inc.
c/o Cambridge Display Technology Limited
2020 Cambourne Business Park
Cambridge  CB2 6DW, United Kingdom



	Re:	Cambridge Display Technology, Inc.
		Form 10-K for the fiscal year ended December 31, 2005
		Forms 10-Q for 2005
		Forms 8-K for 2005
		File No. 0-51079


Dear Mr. Fyfe:

      We have reviewed your filings and have the following
comments.
We have limited our review to only your financial statements and
related disclosures, and do not intend to expand our review to
other
portions of your documents. Where indicated, we ask you to provide
us
with information so we may better understand your disclosure.
Please
be as detailed as necessary in your explanations.  After reviewing
this information, we may raise additional comments.

	Please understand that the purpose of our review process is
to
assist you in your compliance with the applicable disclosure
requirements and to enhance the overall disclosure in your filing.
We look forward to working with you in these respects.  We welcome
any questions you may have about our comments or on any other
aspect
of our review.  Feel free to call us at the telephone numbers
listed
at the end of this letter.





Mr. David Fyfe
Cambridge Display Technology, Inc.
April 25, 2006
Page 2


Form 10-K for the fiscal year ended December 31, 2005

Consolidated Statements of Operations, page F-5

1. Please tell us how you applied S-X Rule 3-09 in concluding that
is
was not necessary to provide financial statements for Litrex
through
the date of disposition.

Note 5.  Investments, page F-19
Other Investments, page F-20

2. Tell us how you applied the guidance from EITF 02-14 in
concluding
that the investment in Add-Vision is not in-substance common
stock.


Form 8-K Dated December 23, 2005

3. We see that you sold common stock and warrants with
registration
rights.  Please tell us how you considered the guidance from EITF
05-
04, SFAS 133 and EITF 00-19 in concluding how to classify and
account
for those warrants.





	As appropriate, please respond to these comments within 10
business days or tell us when you will provide us with a response.
Please furnish a response letter that keys your responses to our
comments and provides the requested information.  Detailed
response
letters greatly facilitate our review.  Please understand that we
may
have additional comments after reviewing your responses to our
comments and the requested information.

	We urge all persons who are responsible for the accuracy and
adequacy of the disclosure in the filing reviewed by the staff to
be
certain that the filing includes all information required under
the
Securities Exchange Act of 1934 and that they have provided all
information investors require for an informed decision.  Since the
company and its management are in possession of all facts relating
to
a company`s disclosure, they are responsible for the accuracy and
adequacy of the disclosures they have made.



Mr. David Fyfe
Cambridge Display Technology, Inc.
April 25, 2006
Page 3


	In connection with responding to our comments, please
provide,
in writing, a statement from the company acknowledging that

* the company is responsible for the adequacy and accuracy of the
disclosure in the filing;

* staff comments or changes to disclosure in response to staff
comments do not foreclose the Commission from taking any action
with
respect to the filing; and

* the company may not assert staff comments as a defense in any
proceeding initiated by the Commission or any person under the
federal securities laws of the United States.

In addition, please be advised that the Division of Enforcement
has
access to all information you provide to the staff of the Division
of
Corporation Finance in our review of your filing or in response to
our comments on your filing.


      You may contact Jeanne Bennett at (202) 551-3606, or me at
(202) 551-3605, if you have questions regarding our comments.  In
our
absence you may contact Brian R. Cascio, Accounting Branch Chief,
at
(202) 551-3676

      Sincerely,


      Gary R. Todd
								Reviewing Accountant



cc:	Steven Ostner, Esq.
	By Fax   (212) 909-6836