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Proceedings Paper

A novel screen design for anti-ambient light front projection display with angle-selective absorber
Author(s): Tianju Liao; Weigang Chen; Kebo He; Zhaoyu Zhang
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Paper Abstract

Ambient light is destructive to the reflective type projection system’s contrast ratio which has great influence on the image quality. In contrast to the conventional front projection, short-throw projection has its advantage to reject the ambient light. Fresnel lens-shaped reflection layer is adapted to direct light from a large angle due to the low lens throw ratio to the viewing area. The structure separates the path of the ambient light and projection light, creating the chance to solve the problem that ambient light is mixed with projection light. However, with solely the lens-shaped reflection layer is not good enough to improve the contrast ratio due to the scattering layer, which contributes a necessarily wide viewing angle, could interfere with both light paths before hitting the layer. So we propose a new design that sets the draft angle surface with absorption layer and adds an angle-selective absorber to separate these two kinds of light. The absorber is designed to fit the direction of the projection light, leading to a small absorption cross section for the projection light and respectfully big absorption cross section for the ambient light. We have calculated the design with Tracepro, a ray tracing program and find a nearly 8 times contrast ratio improvement against the current design in theory. This design can hopefully provide efficient display in bright lit situation with better viewer satisfaction.

Paper Details

Date Published: 7 March 2016
PDF: 6 pages
Proc. SPIE 9770, Advances in Display Technologies VI, 977009 (7 March 2016); doi: 10.1117/12.2214422
Show Author Affiliations
Tianju Liao, Peking Univ. (China)
Weigang Chen, The Chinese Univ. of Hong Kong, Shenzhen (China)
Kebo He, The Chinese Univ. of Hong Kong, Shenzhen (China)
Zhaoyu Zhang, The Chinese Univ. of Hong Kong, Shenzhen (China)

Published in SPIE Proceedings Vol. 9770:
Advances in Display Technologies VI
Liang-Chy Chien; Sin-Doo Lee; Ming Hsien Wu, Editor(s)

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