Method and apparatus to achieve a neutral dark state in image devices
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United States of America Patent
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Issued Date -
Jun 21, 2007
app pub date -
Dec 21, 2005
filing date -
Dec 21, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An absorptive layer is added to an image system. The absorptive layer is selected to compensate for tint in a black state of the image. The absorptive layer is inserted in an image light stream (or light chain) and then tilted or rotated to precisely tune the band [bandwidth] of the absorptive layer to produce a desired neutral dark state. In a Liquid Crystal On Silicon (LCOS) based light engine, blue wavelengths may cause a predominate tint in black portions of an image (or an entirely black image is tinted blue), and the absorptive layer is calculated to absorb an amount of blue equivalent to the tint. The absorptive layer is, for example, a yellow notch filter. The absorptive layer may also be placed in camera image chain.
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