LEAP project to increase light output of LEP displays - Embedded.com

LEAP project to increase light output of LEP displays


Cambridge Display Technology (CDT) has been awarded a grant from the UK Department of Trade and Industry for a collaborative project called Light Emission from Active Polymers (LEAP) between the National Physical Laboratory (NPL), Sheffield University and CDT, all based in the UK. The project is intended to increase the amount of light generated by a light emitting polymer (LEP) display device that is coupled out through the front surface of the device.

The project partners will first model the effects of different structures such as micro-cavities, aerogels, and nano-scale lateral patterning that modify the emission modes of LEP devices. Structures will then be fabricated within the display devices using the results from the initial modelling work. The displays produced in the program will be fully characterised at CDT and NPL, including the measurement of device performance enhancements, uniformity of emission over device area, aging effects and assessment of characteristics such as viewability and contrast.

Dr. Karl Heeks. CDT's Director of Business Development, said, “The amount of light trapped in current LEP devices is very significant. The challenge is to improve the performance of these displays by capturing the 'lost light' that is trapped at interfaces within the display and is internally absorbed or emerges at the edges. To be useful, this must not be accompanied by any reduction in the visibility or colour balance of the display.”

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