1 August 1990 High-brightness liquid-crystal light-valve projector using a new polarization converter
Author Affiliations +
Proceedings Volume 1255, Large-Screen and Projection Displays II; (1990); doi: 10.1117/12.19866
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States
Abstract
A high-brightness liquid crystal light valve (LCLV) projector, in which three amorphous Si TFT-addressed LCLVs are used, has been developed for laroe screen displays. By using a newly developed polarization converter, about twice the brightness has been realized compared to using a conventional sheet polarizer. The polarization converter principle is to efficiently convert an unpolarized light from a light source into a linearly polarized light, used to illuminate a twisted nematic LCLV. The LCLV has 240 x 756 pixels in the 4.3 inch diagonal area. High-brightness full-color images with 120 ft-L brightness have been obtained, when projected onto a 5.0 gain 80 inch diagonal screen using a 300W Xenon arc lamp.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Masao Imai, Mikio Sakamoto, Keiichi Kubota, Yuji Kato, Nobuo Nishida, "High-brightness liquid-crystal light-valve projector using a new polarization converter", Proc. SPIE 1255, Large-Screen and Projection Displays II, (1 August 1990); doi: 10.1117/12.19866; https://doi.org/10.1117/12.19866
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KEYWORDS
Polarization

Projection systems

Light

Liquid crystals

Polarizers

Light sources

Prisms

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