Method and apparatus for adjusting light intensity
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United States of America Patent
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Mar 25, 2008
Grant Date -
N/A
app pub date -
Dec 16, 2004
filing date -
Dec 16, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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