Domain divided liquid crystal display device with particular pre

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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359 78, G02F 11337

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active

054734550

ABSTRACT:
A liquid crystal display device comprising different liquid crystal aligning domains in each of a plurality of unit regions for improving a characteristic of a viewing angle. In at least one of the liquid crystal aligning domains, molecules of the liquid crystal near the first alignment layer are aligned in a first pretilt direction and at a first pretilt angle and molecules of the liquid crystal near the second alignment layer are aligned in a second pretilt direction generally opposite the first pretilt direction and at a second pretilt angle. The first pretilt angle is larger than the second pretilt angle so that molecules of the liquid crystal located intermediately between the first and second plates rise in accordance with the first pretilt angle when voltage is applied. This feature can be widely used in combination with a suitably selected arrangement of the other liquid crystal aligning domain for reducing rubbing steps and photolithography steps.

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Koike et al., "Late-News Paper: A full color TFT-LCD with a Domain-Divided Twisted-Nematic Structure", SID 1992 International Symposium--Digest of Technical Papers, pp. 798-802, May, 1992.
Yang, "Two-Domain Twisted Nematic and Tilted Homeotropic Liquid Crystal Displays for Active Matrix Applications", Conference Record of the 1991 International Display Research Conference, pp. 68-72, Oct. 15, 1991.
"Controlled Two-Domain and Four-Domain Twisted Nematic Liquid Crystal Displays", IBM Technical Disclosure Bulletin, pp. 199-200 vol. 33, No. 1B, Jun., 1990.

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