Indicator device having electro-optical light valve unit

Details Indicator device having electro-optical light valve unit Indicator device having electro-optical light valve unit

1979-07-06

1981-04-28

Bauer, Edward S.

350334, 350339D, 350339F, 350338, G02F 1133

Patent

active

042641470

ABSTRACT:
An indicating device having an electro-optical light valve unit such as in a liquid crystal cell arranged behind a plate containing fluorescent particles characterized by a contrast filter disposed behind the plate and unit in the direction of viewing and a reflector disposed behind the contrast filter. The contrast filter will pass light of the spectrum which excites the fluorescent particles of the fluorescent plate but absorbs the emitted fluorescent light and a majority of the other light so that a background is either dark or of a specific color. The energized light valves cause a bright image on the dark or colored background.

REFERENCES:
patent: 4111534 (1978-09-01), Cirkler et al.
patent: 4113360 (1978-09-01), Baur et al.
patent: 4142781 (1979-03-01), Baur et al.

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