Recent progress in liquid crystal projection displays

Hiroshi Hamada

doi:10.1117/12.273882

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8 May 1997 Recent progress in liquid crystal projection displays

Hiroshi Hamada

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Proceedings Volume 3013, Projection Displays III; (1997) https://doi.org/10.1117/12.273882
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

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.

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Hiroshi Hamada "Recent progress in liquid crystal projection displays", Proc. SPIE 3013, Projection Displays III, (8 May 1997); https://doi.org/10.1117/12.273882

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