Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1994-02-10
1997-04-22
Fahmy, Wael
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349132, 349138, G02F 11337, G02F 11333
Patent
active
056233540
ABSTRACT:
A liquid crystal display with an array of pixels comprises a liquid crystal layer having transparent electrodes on either side thereof with an alignment layer disposed on each of the electrodes and in contact with opposite surfaces of the liquid crystal layer. The alignment layers are capable of inducing a predetermined pre-tilt angle on the molecules of the liquid crystal. The pre-tilt angle inducing ability of at least one of the alignment layers, which is formed with only one alignment direction, has been selectively altered so that pre-tilt angle inducing ability in the altered area differs in the magnitude of the angle from the pre-tilt angle inducing ability of the unaltered area. With the liquid crystal molecules having at least two different pre-tilt angles, more than one domain is created when voltage is applied across the electrodes. The change in the pre-tilt angle inducing ability in the altered areas is achieved by exposure to a beam, such as ultra violet light, of sufficient energy. In the preferred embodiment, the display is an active type with twisted nematic liquid crystals.
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Y. Koike, T. Kamada, K. Okamoto, M. Ohashi, I. Tomita, M. Okabe, "Late-News Paper: A Full-Color TFT-LCD with a Domain-Divided Twisted-Nematic Structure", Fujitsu Ltd., Atsugi, Japan, SID 92 Digest, pp. 798-801 (1992) .
Angelopoulos Marie
John Richard A.
Lien Shui-Chih A.
Abraham Fetsum
Aker David
Fahmy Wael
International Business Machines - Corporation
Sbrollini Jay P.
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