Dual mode light valve display

Details Dual mode light valve display Dual mode light valve display

1978-11-30

1981-10-13

Davie, James W.

350335, 350353, 350359, 350362, G02F 117

Patent

active

042945186

ABSTRACT:
An improved dual mode display optimized for image contrast in both the active and passive modes is described herein. The dual mode display comprises two tandemly disposed light valves in which a semi-transparent reflective surface disposed behind the first light valve display reflects incident light in the passive mode and transmits light from a back illuminating light source in the active mode. The optical density of the electro-responsive material in the first light valve is selected to optimize the image contrast of the image formed by reflected incident light and the optical density of the electro-responsive material of the second light valve cooperates with the electro-responsive material of the first light valve to optimize the contrast of the transmitted image in the active mode of operation.

REFERENCES:
patent: 1955923 (1934-04-01), Land
patent: 1963496 (1934-06-01), Land
patent: 3512876 (1970-05-01), Marks
patent: 3743382 (1973-07-01), Rosenberg
patent: 3799650 (1974-03-01), Saxe
patent: 3807832 (1974-04-01), Castellion
patent: 3897137 (1975-07-01), Dobbins
patent: 4093356 (1978-06-01), Bigelow
patent: 4104627 (1978-08-01), Thuler
patent: 4135790 (1979-01-01), Takahashi et al.

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