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Pixelated-compensators-for-twisted-nematic-liquid-crystal-displays

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Pixelated compensators for twisted nematic liquid crystal displays

Details

Inventors: Gunning, III, William J.; Winker, Bruce K.; Koch, Gene C.;
Assignee:
Primary Examiner: Sikes; William L.
Assistant Examiner: Trice; Ron
Attorney, Agent or Firm: Williams; Gregory G., Murrah; M. Lee, Montanye; G. A.

A novel normally-white dual-domain twisted nematic liquid crystal display exhibits dramatically improved contrast and gray scale linearity stability over a wide range of viewing angles as compared to conventional dual-domain twisted nematic displays. The display incorporates one or more pixelated compensator layers internal to the liquid crystal cell. A pixelated compensator layer has a pattern wherein the orientation or retardation of the compensator layer varies according to the tilt domain structure of the display's liquid crystal material. Such a pixelated compensator layer allows optimal compensation for each of the differently oriented liquid crystal tilt domains. The pixelated compensator layer(s), and possibly one or more non-pixelated compensator layers, may be deposited on either a display's active matrix substrate or its (passive) color filter substrate, or a combination thereof.

DETAILED DESCRIPTION A novel normally-white dual-domain twisted nematic liquid crystal display exhibits dramatically improved contrast and gray scale linearity stability over a wide range of viewing angles as compared to conventional dual-domain twisted nematic displays.
The display incorporates one or more pixelated compensator layers internal to the liquid crystal cell.
A pixelated compensator layer has a pattern wherein the orientation or retardation of the compensator layer vanes according to the tilt domain structure of the display's liquid crystal material.
Such a pixelated compensator layer allows optimal compensation for each of the differently oriented liquid crystal tilt domains.
The pixelated compensator layer(s), and possibly one or more non-pixelated compensator layers, may be deposited on either a display's active matrix substrate or its (passive) color filter substrate, or a combination thereof.

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