Pixelated compensators for twisted nematic liquid crystal displa

Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only

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Details

349118, 349120, 349126, G02F 11335, G02F 11337

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active

055899633

ABSTRACT:
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.

REFERENCES:
patent: 5179457 (1993-01-01), Hirataka et al.
Yang, "Two-Domain Twisted Nematic and Tilted Homeotropic Liquid Crystal Displays for Active Matrix Applications," IEEE International Display Research Coference, 1991, pp. 68-72.
"Normally White Negative Birefringence film Compensated Twisted Nematic Liquid Crystal Displays with Improved Optical Performance", IBM Technical Disclosure Bulletin, vol. 36, No. 09B, 1993, p. 361.
Koike et al, "Late-News Paper: A Ful-Color TFT-LCW With a Domain-Divided Twisted-Nematic Structure," SID 92 Digest, pp. 798-801, 1992.
Takatori et al, "A Complementary TN LCD with Wide-Viewing-Angle Grayscale," Proceedings 12th Int. Display Res. Conf.--Japan Display 92, pp. 591-594, 1992.

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