Uniform contrast liquid crystal display with varied liquid cryst

Details Uniform contrast liquid crystal display with varied liquid cryst Uniform contrast liquid crystal display with varied liquid cryst

1990-07-30

1992-03-10

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 76, 359 87, 359 93, G02F 113

Patent

active

050953788

ABSTRACT:
A liquid crystal display is described incorporating a front electrode, a rear electrode and a liquid crystal material assembled to provide various optical path differences. The invention overcomes the problem of variation in contrast ratio and black level (background color) as a function of the viewing angle. The surfaces of the liquid crystal form an angle between 5.times.10.sup.-5 to 5.times.10.sup.-4 degrees.

REFERENCES:
patent: 4398803 (1983-08-01), Pohl et al.
patent: 4521080 (1985-06-01), Funada et al.
patent: 4712877 (1987-12-01), Okada et al.
Ludeman et al., "Liquid Crystal Cell Having Nonuniform Thickness", IBM Technical Disclosure Bulletin, vol. 15, No. 4, 9/72, pp. 1349-1350.

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