Optical display device

Details Optical display device Optical display device

1977-04-27

1978-09-05

Bauer, Edward S.

350347, G02F 113

Patent

active

041115341

ABSTRACT:
An optical display device having a high contrast in the light intensity of the image being displayed relative to the background light characterized by a liquid crystal cell having a layer of liquid crystal material interposed between spaced front and rear transparent carrier plates which have transparent electrodes on their inner surfaces facing the layer and a fluorescent plate of material, which has an index of refraction greater than 1, and fluorescent centers creating fluorescent light from an ambient light, being disposed behind the liquid crystal cell in the direction of viewing with the surface of the fluorescent plate being in direct contact with an outer surface of the rear carrier plate. In this device, a selective application of voltage to the selected electrodes of the cell will cause a change in the optical properties of the liquid crystal layer to decouple light from the display with an intensity substantially greater than the intensity of the background of the display. Preferably, the liquid crystal cell is received within a recess in the plate so that the outer surface of the front plate is flush with the remaining surface of the fluorescent plate. If desired, an additional illuminating device may be encapsulated within the plate to provide an additional source of light.

REFERENCES:
patent: 3781087 (1973-12-01), Nagasaki
patent: 3838908 (1974-10-01), Channin
patent: 3864905 (1975-02-01), Richardson
patent: 3918794 (1975-11-01), Milton
patent: 3950078 (1976-04-01), Zatsky
patent: 3963310 (1976-06-01), Giallorenzi et al.
patent: 3980395 (1976-09-01), Giallorenzi et al.
patent: 4043636 (1977-08-01), Eberhardt et al.
patent: 4054362 (1977-10-01), Baues
Bush et al.: "Liquid Crystal Display Device," IBM Tech. Disc. Bull., vol. 14, p. 223, Jun., 1971.

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