Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-12-19
1991-12-10
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 75, 359102, 359 79, G02F 113
Patent
active
050712284
ABSTRACT:
A black-white liquid crystal display (10) contains a nematic liquid crystal with a twist of 270.degree. between cell plates. The product of the liquid crystal layer thickness and anisotropy of the refractive index is about 0.38. A pretilt of about 15.degree. is present. The polarization directions (P1, P2) have an angle .beta. of 45.degree. to the orientation directions (Mo, Mu). This display features a very wide viewing angle range with relatively little dependence of the contrast on the viewing angle and there is an almost complete absence of color shift depending on the viewing angle. Due to the significant enhancement in viewing angle range in relation to contrast and color neutrality compared with all known cells, the display is called "Extended Viewing Angle" display (EVA display). It has a very high multiplexability.
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"Electro-Optical Performance of a New, Black-White and Highly Multiplexible Liquid Crystal Display", M. Schadt and F. Leenhouts, Appl. Phys. Lett. 50(5), Feb. 2, 1987, pp. 236-238.
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Borsig Stefan
Waldmann Jurgen
Mai Huy K.
Miller Stanley D.
Nokia Unterhaltungselektronik
Van Der Sluys Peter C.
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