Method and apparatus for adjusting light intensity

Details Method and apparatus for adjusting light intensity Method and apparatus for adjusting light intensity

2004-12-16

2008-03-25

Qi, Mike (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S096000, C349S005000, C349S009000

Reexamination Certificate

active

07349048

ABSTRACT:
A variable retarder and linear polarizer are placed in series in a polarized light path. A transmission axis of the linear polarizer is parallel to an axis of a polarization of the polarized light. An amount of retardation dialed into the variable retarder causes an amount of the light to have a component with an amount of off axis polarization. The off-axis components do not pass the linear polarizer, causing a reduction in the brightness of the polarized light. The combined variable retarder and linear polarizer operate as a light shutter that may be utilized, for example, to increase contrast ratio and bit depth regardless of light level in a video projection system (e.g., LCoS light engines).

REFERENCES:
patent: 5187603 (1993-02-01), Bos
patent: 5347377 (1994-09-01), Revelli et al.
patent: 5412500 (1995-05-01), Fergason
patent: 2004/0008267 (2004-01-01), Chen et al.
patent: 2004/0051830 (2004-03-01), Kashima
patent: 2005/0099564 (2005-05-01), Wang et al.

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