A Nematic-Cholesteric Bistable Liquid Crystal Display For Projectors

A. Mochizuki; M. Iwasaki; Y. Yamagishi; H. Gondo; H. Yamaguchi

doi:10.1117/12.940113

20 April 1987 A Nematic-Cholesteric Bistable Liquid Crystal Display For Projectors

A. Mochizuki, M. Iwasaki, Y. Yamagishi, H. Gondo, H. Yamaguchi

Proceedings Volume 0760, Large Screen Projection Displays; (1987) https://doi.org/10.1117/12.940113
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

An electrically writable bistable liquid crystal projection display has been developed. This projection display uses the bistable effect of nematic-cholesteric liquid crystal phase transition under an electric field. The nematic-cholesteric liquid crystal has some advantages in application for a projection display. These are a bright screen with no need for polarizers, a high information content, thanks to the bistable memory effect, a compact system written by only electric field, and a low cost projection system using a simple matrix panel. The newly developed liquid crystal projector has 640x400 pixels, and has good contrast under the bright ambient light of a normal office environment. It takes 1.6 seconds to write all the pixels and 100 milliseconds to type in a 16x16-dot letter. It operates satisfactorily between 5 to 45 T. Use of the nematic-cholesteric liquid crystal results in the total size of the projection system to that of a portable overhead projector. Writing by an electric field makes it quite easy to connect with floppy disk systems, key boards and communication equipment systems.

Citation Download Citation

A. Mochizuki, M. Iwasaki, Y. Yamagishi, H. Gondo, and H. Yamaguchi "A Nematic-Cholesteric Bistable Liquid Crystal Display For Projectors", Proc. SPIE 0760, Large Screen Projection Displays, (20 April 1987); https://doi.org/10.1117/12.940113

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