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Proceedings Paper

Recent progress in liquid crystal projection displays
Author(s): Hiroshi Hamada
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Paper Abstract

An LC-projector usually contains 3 monochrome TFT-LCDs with a 3-channel dichroic system or a single TFT-LCD with a micro color filter. The liquid crystal operation mode adopted in a TFT-LCD is TN. The optical throughput of an LC-projector is reduced by a pair of polarizers, an aperture ratio of a TFT- LCD and a color filter in a single-LCD projector. In order to eliminate absorption loss by a color filter, a single LCD projection system which consists of a monochrome LCD with a microlens array and a color splitting system using tilted dichroic mirrors or another optical element such as a holographic optical element or a blazed grating has been developed. And LC rear projection TVs have started to challenge CRT-based rear projection TVs. In addition to this system, new technologies to improve optical throughput have been developed to the practical stage such as an active- matrix-addressed PDLC and a reflective type LCD on a Si-LSI chip. Merits and technical issues of newly developed systems and conventional systems including a-Si TFT-LCDs and p-Si TFT-LCDs are discussed mainly in terms of optical throughput.

Paper Details

Date Published: 8 May 1997
PDF: 10 pages
Proc. SPIE 3013, Projection Displays III, (8 May 1997); doi: 10.1117/12.273882
Show Author Affiliations
Hiroshi Hamada, Sharp Corp. (Japan)

Published in SPIE Proceedings Vol. 3013:
Projection Displays III
Ming Hsien Wu, Editor(s)

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