CDT Achieves 100,000 Hour Blue Polymer Lifetime
CAMBRIDGE, England, May 23 /PRNewswire-FirstCall/ -- Cambridge Display Technology (CDT) [Nasdaq: OLED] announces the achievement of another important milestone with the development of blue polymers for light emitting devices with 100,000 hours lifetime* from an initial luminance of 100cd/m2.
This latest announcement is one of a series which CDT has made to enable the industry to chart its progress on this key parameter. Figures of 30,000, 70,000 and 80,000 hours (all from 100cd/m2) were published in May, October and December 2004.
Lifetime is one of the most important parameters which have governed the rate at which PLED technology is adopted commercially, and there is much industry interest in such figures. For this reason CDT has, for the first time, made available a wider range of data around its latest achievement, and included lifetime data for higher initial luminance levels.
Lifetimes for devices made using the new blue materials at 200cd/m2, 300cd/m2 and 400cd/m2 are greater than 25,000 hours, 10,000 hours and 6,000 hours respectively.
Higher lifetimes are already available with red and green polymers, and so this increased blue lifetime will allow yet more applications to be realized using PLED technology, including full colour displays for digital cameras, PDAs and DVD players. PLED display applications will ultimately include large flat panel televisions.
For CDT, Dr David Fyfe, CEO noted that the performance of materials in an actual display system will depend on a number of factors other than simply brightness to the viewer, such as whether the devices are top-emitting or bottom-emitting, the aperture ratio, the sub-pixel aperture ratio, average pixel brightness, choice of circular polarizer and so on. Fyfe says: "CDT intends to press for industry standards which reflect these realities and which will also allow calculations to be made of system performance at any level, enabling materials to be compared and the practical significance of quoted lifetimes to be exemplified.
"I am delighted to be reporting these new levels of blue lifetime, levels which are consistent with our rapid yet consistent progress over the last two years. We believe the disclosure of lifetime data at more challenging luminance levels will give additional meaning to these results and help designers and display makers to predict more accurately the performance of our technology in real life applications."
* Note to editors: 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. |
