Optical display system and method, active and passive dithering using birefringence, color image superpositioning and display enhancement with phase coordinated polarization switching
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United States of America Patent
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Nov 30, 2010
Issued Date -
N/A
app pub date -
Nov 19, 2007
filing date -
Oct 25, 1994
priority date (Note) -
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Abstract
A display apparatus is disclosed comprising a passive display; a light source to provide illumination of the passive display; a video signal input, wherein in response to a video signal the passive display modulates light from the light source to provide an image, and wherein the intensity of light provided by the light source illuminating the display is controlled based on the video signal and wherein the passive display is capable of displaying a preset range of gray levels and presenting a displayed image in response to the video signal; and a control operable to expand a range of gray levels represented in the video signal across substantially all of preset range of gray levels.
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