Liquid crystal display having holographic diffuser for preconditioning light incidient upon a liquid crystal medium
OwnerCharles M. Peterson, Thomas A. Sederinventors
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Abstract
A twisted nematic liquid crystal display utilizes a premodifying or contouring circuit to provide inverse characteristics of the LCD. The contouring circuit compensates for the non-Lambertian characteristics of the liquid crystal display. This system provides a superior contrast ratio, gray-scale performance and stable chromaticity. The contour circuit can include a holographic diffuser.
Claims20
A twisted nematic liquid crystal display system having a field of view, the liquid crystal display system comprising:
- a Lambertian light source;
- a first polarizer;
- a color liquid crystal cell having a particular output distribution;
- a second polarizer disposed in front of the liquid crystal cell;
- and
- a holographic diffuser disposed between the first polarizer and the second polarizer, whereby the diffuser is tuned to contour the light from the Lambertian light source in accordance with an inverse of the output distribution.
A liquid crystal display system, comprising:
- a light source;
- a color liquid crystal cell having a response and disposed in front of the light source;
- and
- means for contouring light from the light source inversely to the response, whereby the liquid crystal display system provides a Lambertian output.
A method of optimizing a field of view of a color liquid crystal display, the method comprising:
- providing a light from a light source;
- contouring light distribution of the light in accordance with an inverse of characteristics of a liquid crystal cell;
- providing the light distribution through the liquid crystal cell, whereby output light distribution from the liquid crystal cell is Lambertian.
Dependencies are inferred from the claim text.