Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-05-19
1996-11-19
Fahmy, Wael
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 54, 359 55, 359 73, 359 75, G02F 11343, G02F 11335, G02F 11337
Patent
active
055768636
ABSTRACT:
Liquid crystal is encapsulated between two transparent substrates 16, 17. Pixel electrodes 13 are formed on the inner surface of the transparent substrate 17 in the form of a matrix while a common electrode 12 is formed on the inner surface of the transparent substrate 16. Each pixel electrode 13 is divided into subpixel electrodes 13.sub.1, 13.sub.2. The subpixel electrode 13.sub.1 is connected to the drain of a thin film transistor 21 formed adjacent the subpixel electrode to apply driving voltage to the electrode. The subpixel electrode 13.sub.2 is supplied with capacitance-divided driving voltage through a capacitor comprising the electrode 13.sub.1, and a control capacitor 15 connected thereto with an insulation layer 14 interposed therebetween. Each of the subpixel electrodes 13.sub.1, 13.sub.2 are divided into two domains on which are formed alignment layers 41a, 41b, 42a, 42b, in opposition to alignment layers 43a, 43b, 44a, 44b formed on the common electrode 12. One of the opposed alignment layers is adapted to impart to the liquid crystal a pretilt angle greater than the other alignment layer. One of a pair of adjacent orientating films in the same plane is adapted to impart to the liquid crystal a pretilt angle greater than the other orientating film.
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Y. Koike et al., "Late-News Paper: A Full-Color TFT-LCD with a Domain-Divided Twisted-Nematic Structure," 1992 SID International Symposium Digest of Technical Papers, May 1992, pp. 798-801.
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Aoki Shigeo
Nakagawa Takanobu
Shibazaki Minoru
Sunata Tomihisa
Ukai Yasuhiro
Abraham Fetsum
Fahmy Wael
Hosiden Corporation
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