Liquid crystal display element and laminated retardation film ap

Details Liquid crystal display element and laminated retardation film ap Liquid crystal display element and laminated retardation film ap

1995-05-12

1996-11-12

Hellner, Mark

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359 53, 359 96, 359 93, G02F 103, G02F 1137

Patent

active

055745938

ABSTRACT:
A bright reflective liquid-crystal display element with high contrast which does not require a polarizer is provided together with a laminated retardation film applied thereto. Row electrodes are formed on the surface of an upper substrate, and on the surface of a lower substrate, a column electrode is formed. On top of the row electrodes and the column electrode, an alignment film is printed, and both substrates are subject to rubbing process from the right side of the paper face to the left side. Then, these substrates are joined together to form a blank cell. Chiral nematic liquid crystals are made by mixing a trace of chiral dopant to nematic liquid crystals, and 1% of black dichroic dye made by mixing a several colors of anthraquinone dichroic dye is dissolved in the chiral nematic liquid crystals to form guest host liquid crystals. The gest host liquid crystals are injected into the blank cell, thereby forming a liquid crystal panel. Under the liquid crystal panel, a retardation film is positioned, which is a quarter wavelength plate giving retardation of 140 nm against incident light with the wavelength of 550 nm. Then, a reflection plate is positioned under the retardation film.

REFERENCES:
patent: 4556286 (1985-12-01), Uchida et al.
patent: 5212819 (1993-05-01), Wada
patent: 5303075 (1994-04-01), Wada et al.
Cole et al., A new reflective dichroic Liquid-crystal display device, Applied Physics Letters, vol. 30 No. 12, Jun. 1977.
Fujimura et al., Optical Properties of Retardation Films for STN-LCDs, SID 91 Digest, pp. 739-742, 1991.
Mitsui et al., Late-News Paper: Bright Reflective Multicolor LCDs Addressed by a-Si TFTs, SID 92 Digest, pp. 437-440, 1992.

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