Inorganic thin film compensator for improved gray scale performance in twisted nematic liquid crystal displays and method of making
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United States of America Patent
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Jun 10, 1997
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app pub date -
Sep 30, 1994
filing date -
Apr 4, 1994
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Abstract
An optical O-plate compensation device, in accordance with the invention, uses an inorganic thin film which is grown by physical vapor deposition at oblique incidence. The resulting thin film exhibits a biaxial form birefringence and performs, in a liquid crystal display (LCD), in a similar manner to uniaxial films with its extraordinary axis oriented obliquely at about 45.degree. with respect to the surface of the film. The invention makes possible a significant improvement in the gray scale properties and contrast ratios of liquid crystal displays (LCDs) over a wide range of viewing angles.
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