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Proceedings Paper

High-resolution projection valve with amorphous silicon AMLCD technology
Author(s): F. Maurice; H. Lebrun; N. Szydlo; U. Rossini; R. Chaudet
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Paper Abstract

Two kinds of LCD light valves are presently used in LCD projectors: HT poly valves, with an aperture higher than 50 percent, but with limited size due to a specific high cost of the technology, and amorphous silicon valves with a much more attractive dollar per square inch figure, but with much higher sizes due to a limited resolution capability. We have broken this a-Si:H valve resolution limit by developing high performance short channel length BCE TFTs, high aperture pixels with black matrix underneath the TFT array and ITO pixels on the top, placed spacers to optimize uniformity and shield the TFT against light, high tilt polyimide/liquid crystal combination, and integrated drivers made of the same amorphous silicon TFTs. We will present our solutions, which can be implemented in any a-Si:H production line, with emphasis on those related to the integration of drivers. Driver integration with a-Si:H TFTs can be achieved without any compromise on performance nor on reliability, and we will report on actual life times above 10 khrs for valves operating under high thermal stress. As a result we have opened the door to a new and broad a-Si:H valve family providing optimized performance and cost figures for sizes between 1 and 6 inches in diagonal.

Paper Details

Date Published: 17 April 1998
PDF: 8 pages
Proc. SPIE 3296, Projection Displays IV, (17 April 1998); doi: 10.1117/12.305512
Show Author Affiliations
F. Maurice, Thomson LCD (France)
H. Lebrun, Thomson LCD (France)
N. Szydlo, Thomson LCD (France)
U. Rossini, Thomson LCD (France)
R. Chaudet, Thomson LCD (France)

Published in SPIE Proceedings Vol. 3296:
Projection Displays IV
Ming Hsien Wu, Editor(s)

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