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Proceedings Paper

Improved projection optics for reflective silicon CMOS light valves
Author(s): Hui-Feng Li; Zengrong Zheng; Peifu Gu; Liu Xu; Dennis Cheng; Jun Chen; Ho-Chi Huang; HoiSing Kwok
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Paper Abstract

The optical sub-systems for reflective mode silicon based CMOS-LCD projection display are discussed in this paper. Various methods to improve the optical efficiency of the projection system are proposed. First, new optical modes for the reflective light valve are discussed. The emphasis is on improving the reflectance. Second, a new high throughput projection system employing a 2-step process is proposed. It employs a conventional LCLV projection system capable of very high luminous output. FInally, the color separation and recombination schemes for a full color projector are discussed. A new trichroic prism assembly design is described which has the advantages of low s and p polarization splitting in the reflectance spectrum. Hence it can be used for both color separation and recombination. Thus a compact optical system for reflective projectors is possible with good light efficiency.

Paper Details

Date Published: 20 May 1999
PDF: 9 pages
Proc. SPIE 3634, Projection Displays V, (20 May 1999); doi: 10.1117/12.349350
Show Author Affiliations
Hui-Feng Li, Zhejiang Univ. (China)
Zengrong Zheng, Zhejiang Univ. (China)
Peifu Gu, Zhejiang Univ. (China)
Liu Xu, Zhejiang Univ. (China)
Dennis Cheng, Hong Kong Univ. of Science and Technology (Hong Kong)
Jun Chen, Hong Kong Univ. of Science and Technology (Hong Kong)
Ho-Chi Huang, Hong Kong Univ. of Science and Technology (Hong Kong)
HoiSing Kwok, Hong Kong Univ. of Science and Technology (Hong Kong)


Published in SPIE Proceedings Vol. 3634:
Projection Displays V
Ming Hsien Wu, Editor(s)

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