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20.2: New Front‐Projection Screen Comprised of Cholesteric‐LC Films
Author(s) -
Umeya Masanori,
Hatano Masahiro,
Egashira Noritaka
Publication year - 2004
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1821402
Subject(s) - optics , front (military) , high contrast , materials science , projection (relational algebra) , wavelength , contrast (vision) , polarization (electrochemistry) , cholesteric liquid crystal , optoelectronics , liquid crystal , physics , chemistry , computer science , algorithm , meteorology
Abstract A new front‐projection screen made with cholesteric‐liquid‐crystal films has been developed. The films selectively reflect light with a particular polarization and wavelength, and the light diffusion properties are controlled. Consequently, the screen displays a bright, high‐contrast image, even in a bright room. It has almost ten times the contrast ratio of a conventional front‐projection screen in a bright room with polarized ambient light.