Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-04-22
1994-05-10
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 74, G02F 11333, G02F 11335
Patent
active
053113403
ABSTRACT:
Disclosed is a liquid crystal display device including a liquid crystal cell in which a twisted nematic liquid crystal is interposed between a pair of transparent electrodes disposed opposite to each other, a pair of polarizers, an optically compensating element having a maximum refractive index in a direction in the plane thereof, and a thin film having a maximum refractive index in the direction of the thickenss thereof, the optically compensating element and the thin film being interposed between the liquid crystal cell and the polarizer so as to substantially satisfy specific conditions. This liquid crystal display device offers an improved viewing angle and is advantageously used in a black and white liquid crystal display.
REFERENCES:
patent: 5138474 (1992-08-01), Arakawa
patent: 5184236 (1993-02-01), Miyashita et al.
patent: 5212819 (1993-05-01), Wada
patent: 5227903 (1993-07-01), Miyazawa et al.
patent: 5235450 (1993-08-01), Yoshimura et al.
Suguru Yamamoto et al., "Retardation Film for LCD," in Nitto Giho, vol. 28, No. 2, pp. 105-113 (Oct. 1990).
Murata Makoto
Nakajima Akihiko
Yoshida Eiichi
Gross Anita P.
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
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