CAMBRIDGE, United Kingdom, May 21, 2007 (PRIME NEWSWIRE) -- Cambridge Display Technology (CDT) (Nasdaq:OLED) and Sumation(r) are pleased to announce new and improved results for green and blue P-OLED materials.

Data from spin coated devices using a common cathode and a recently developed solution processable green P-OLED material demonstrate lifetimes(1) of 50,000 hours from an initial luminance of 1000 candelas per square meter, or cd/sq.m. This is equivalent(2) to over 285,000 hours from an operating brightness of 400cd/sq.m for this material and represents a 40% increase in lifetime compared to results announced on March 27, 2007.

Blue materials have now been developed with a demonstrated lifetime(1) of 10,000 hours from an initial luminance of 1000 cd/sq.m (or 62,000 hours from an operating brightness of 400cd/sq.m) and a deeper color.
CIE chromaticity coordinates for previously reported blues were x=0.14, y=0.21, whereas the latest materials are much deeper (x=0.14, y=0.19).
Developing red, green and blue materials with the right color point is particularly important for full color display applications from which richness of color is increasingly being expected and demanded by consumers.

Chief Executive Officer of CDT, David Fyfe commented, "The rapid progress on materials developed at Sumation, CDT's joint venture with Sumitomo Chemical, continues unabated. We are delighted to see further improvements in lifetime and color and look forward to keeping you updated on our progress."

Executive Vice President of Sumation, Scott Brown added, "We are extremely pleased with the progress we have made since our last announcement in the first quarter of 2007 and with the increased interest in our solution-processable materials from customers. We believe this is a testament to the strength in our ability to quickly innovate and deliver materials that meet customer needs. We are now receiving detailed customer feedback on the performance characteristics that our materials have to meet in commercial products in terms not only of material lifetime, but also of color point, power efficiency and driving voltage. Our development program is making rapid progress in improving performance measured against all of these characteristics."

Notes to editors:

 (1) When 'lifetime' is discussed here, it refers to the time taken for
     the display/pixel to fall to half its initial stated luminance.
     Lifetime estimates are based on accelerated testing of simple test
     devices at several very high initial luminance levels, and use of
     these data to calculate predicted lifetimes at lower brightness
     levels. Translation of this single pixel data into performance in
     a full color display system depends on a number of factors and
     requires a complex calculation and knowledge of the precise system
     design parameters such as aperture ratio, brightness, ink
     formulation and relative pixel areas.

 (2) Acceleration factors to convert lifetime from one brightness to
     another have been determined for green and blue materials using
     various initial luminances between 6000 cd/sq.m and 800 cd/sq.m
     and found to be equal to 1.9 for green and 2 for blue. These
     acceleration factors were used to predict lifetimes at 400
     cd/sq.m. It should be noted that due to the long lifetimes at 400
     cd/sq.m, lifetime predictions at this brightness are susceptible
     to greater errors than the lifetimes quoted at 1,000 cd/sq.m

About CDT
Cambridge Display Technology is a pioneer in the development of polymer organic light emitting diodes (P-OLEDs) and their use in a wide range of electronic display products used for information management, communications and entertainment. P-OLEDs are part of the family of OLEDs, which are thin, lightweight and power efficient devices that emit light when an electric current flows. P-OLEDs offer an enhanced visual experience and superior performance characteristics compared with other flat panel display technologies such as liquid crystal displays, and have the key advantage that they can be applied in solution using printing processes. Founded in 1992, the company is headquartered in Cambridge, UK and listed on the U.S. NASDAQ Global Market under the symbol 'OLED.' In 2005, CDT and Sumitomo Chemical established a joint venture called Sumation(r) which develops, manufactures and sells P-OLED materials to the display industry. More information on CDT can be found at: www.cdtltd.co.uk

About Sumation
Sumation is a 50:50 joint venture between Cambridge Display Technology Ltd. and Sumitomo Chemical Co. Ltd. Sumation was formed in November of 2005 and is headquartered in Tokyo, Japan. Sumation develops, manufactures and sells P-OLED materials to the display and lighting industry. More information on Sumation can be found at: www.sumation.co.uk