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A high‐contrast front‐projection display system optimizing the projected light‐angle range
Author(s) -
Katagiri Baku,
Ooike Masanobu,
Uchida Tatsuo
Publication year - 2010
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid18.2.173
Subject(s) - viewing angle , projection (relational algebra) , optics , diffuser (optics) , contrast (vision) , contrast ratio , range (aeronautics) , materials science , reflector (photography) , physics , computer science , light source , liquid crystal display , algorithm , composite material
— The problem with front‐projection displays is that the screen contrast ratio decreases under bright‐ambient conditions. To overcome this problem, the design of a special screen, composed of the diffuser whose diffusing property shows top‐hat characteristics and a sawtooth reflector, is proposed. The screen diffuses the incident image light arriving at a projection‐angle range that is a lower‐angle range than the viewing‐angle range, and reflects the ambient light out of the viewing‐angle range. In this paper, the projection‐angle range and the viewing‐angle range was optimized to improve the contrast ratio of a front‐projection display. As a result, a special screen with the above‐mentioned diffusing property was realized, and a high‐quality front‐projection display with a high contrast ratio, even in a bright room, was achieved.