Liquid crystal display with patterned retardation films
First Claim
1. A normally white twisted nematic liquid crystal display having a wide viewing angle comprising:
- a liquid crystal layer for twisting at least one normally incident wavelength of light from about 82-100 degrees when said liquid crystal layer is in the off state thereby defining a twisted nematic display;
first and second polarizers located on opposite sides of said liquid crystal layer and oriented relative to one another so as to define the normally white display;
a first colored pixel having a first retardation means including an optical axis oriented in a first direction;
a second colored pixel having a second retardation means including an optical axis oriented in a second direction, wherein said first and second pixels are of different colors and said first and second directions are different so as to widen the viewing angle of the display;
a first color filter in said first pixel and a second is color filter in said second pixel, said first and second color filters being of said different colors;
a backlight for directing non-colored light through said first polarizer and toward said liquid crystal layer; and
wherein said first and second retardation means are oriented so that they do not substantially color the light from said backlight so that light exiting said first and second retardation means is substantially the same color as light entering said first and second retardation means respectively, wherein said first and second retardation means improve viewing characteristics of the display at wide viewing angles.
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Abstract
A multi-colored pixel for a twisted nematic liquid crystal display including red, green, and blue subpixels, wherein each subpixel includes a pair of substrates, a pair of polarizers, opposing electrodes, and a color personalized retardation film which compensates for the different wavelength of each color. The personalized retardation films of the different color subpixels results in elimination of the multi-gap approach and substantially eliminates the problem of different color leakages at different viewing angles, including normal. Also, one polymer based element, preferably a polyimide, functions as both a color filter and a retardation film in certain embodiments of this invention.
100 Citations
10 Claims
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1. A normally white twisted nematic liquid crystal display having a wide viewing angle comprising:
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a liquid crystal layer for twisting at least one normally incident wavelength of light from about 82-100 degrees when said liquid crystal layer is in the off state thereby defining a twisted nematic display; first and second polarizers located on opposite sides of said liquid crystal layer and oriented relative to one another so as to define the normally white display; a first colored pixel having a first retardation means including an optical axis oriented in a first direction; a second colored pixel having a second retardation means including an optical axis oriented in a second direction, wherein said first and second pixels are of different colors and said first and second directions are different so as to widen the viewing angle of the display; a first color filter in said first pixel and a second is color filter in said second pixel, said first and second color filters being of said different colors; a backlight for directing non-colored light through said first polarizer and toward said liquid crystal layer; and wherein said first and second retardation means are oriented so that they do not substantially color the light from said backlight so that light exiting said first and second retardation means is substantially the same color as light entering said first and second retardation means respectively, wherein said first and second retardation means improve viewing characteristics of the display at wide viewing angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification