Apparatus and method for a high contrast, wide angle, color, flat panel, liquid crystal display
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United States of America Patent
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Aug 17, 1993
Issued Date -
N/A
app pub date -
Jan 30, 1992
filing date -
Dec 18, 1989
priority date (Note) -
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Abstract
In order to provide a high contrast, wide angle, color, liquid crystal display, the pixel elements each have subpixel color cells fabricated with a thickness of liquid crystal material through which light perpendicular to the display panel is transmitted that is less than the liquid crystal thickness for minimizing optical transmission when the subpixel cell is in an off-state. Using a thickness less than the thickness of liquid crystal material for minimizing off-state optical transmission on the axis perpendicular to the plane of the display panel (and component subpixel color cells) results in the minimum optical transmission at an off-axis viewing angle. By permitting a small amount of off-state optical transmission along the axis of the display (as a result of using a liquid crystal thickness less than the thickness required for minimizing undesired transmittance), a relatively small undesired transmittance of light for the liquid crystal cell display can be achieved over wide viewing angle. This thickness of liquid crystal for each pixel color is combined with an arrangement of color component cells for each pixel which minimizes the perceptible display image spatial noise.
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