Electro-optic passive display device

Details Electro-optic passive display device Electro-optic passive display device

1977-05-13

1979-02-13

Bauer, Edward S.

350345, 350347, 350352, G02F 113

Patent

active

041392728

ABSTRACT:
An electro-optic passive display device displays information in dark characters on a light background during the day, and in light characters on a dark background during the night. The device has a polarizer, an electro-optic display cell, a quarter-wave plate, a chloesteric liquid crystal cell and an illuminator arranged in superposition on each other. These elements control the polarization of light transmitted through the device which polarization causes the changing of the displayed information from dark characters on a light background to light characters on a dark background.

REFERENCES:
patent: 3950078 (1976-04-01), Zatsky
patent: 4017156 (1977-04-01), Moriyama et al.
patent: 4019808 (1977-04-01), Scheffer
patent: 4032218 (1977-06-01), Scheffer
patent: 4043636 (1977-08-01), Eberhardt et al.

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