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Title: Improved projection optics for reflective silicon CMOS light valves
Authors: Li, H. F.
Zheng, Z. R.
Gu, P. F.
Liu, X.
Cheng, P. W.
Chen, J.
Huang, Ho-Chi
Kwok, Hoi-Sing
Keywords: Projection display
Reflective modes
Trichoric prisms
Issue Date: 1999
Citation: Projection Displays V, Proceedings of SPIE, Vol. 3634, San Jose, California, USA, 26-28 January, 1999, SPIE, Bellingham, Washington, USA, 1999, p. 123-131
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.
Rights: This paper was published in Projection Display V, Ming H. Wu, Edition, Proceedings of SPIE Vol. 3634 and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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