Contrast enhanced liquid crystal display

Details Contrast enhanced liquid crystal display Contrast enhanced liquid crystal display

1983-04-08

1985-05-14

Corbin, John K.

350338, 350339D, G02F 113

Patent

active

045168342

ABSTRACT:
A contrast enhanced liquid crystal display is disclosed having two substantially identical liquid crystal displays with a transflector disposed in between such that light entering from the viewing surface of the first liquid crystal is attenuated twice by the dark areas of the first crystal, and light entering from the rear of the second crystal is attenuated twice, once by the rear liquid crystal and once by the front liquid crystal. This configuration provides an enhanced contrast for all viewing conditions ranging from bright sunlight to totally dark conditions wherein the contrast ratio is maintained relatively constant at between 9:1 and 11:1 when comparing the light areas of the display to the darkened areas when using single crystals each having a contrast ratio of between 4:1 and 4.5:1 in back lit conditions.

REFERENCES:
patent: 4208869 (1980-06-01), Hanaoka
patent: 4294518 (1981-10-01), O'Connor et al.
patent: 4364039 (1982-12-01), Penz
"Color Liquid Crystal Display", published by Stanley Electric Co., Ltd. in approximately 1981.

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