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US 4,309,081 AGranted
Display devices
AssigneeBell Telephone Laboratories, Incorporated
InventorsIrfan Camlibel, Shobha Singh, LeGrand G. Van Uitert, George J. Zydzik
Life of this patent
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Abstract
Display devices are described which contain organic quinones or diones as active material. These devices exhibit high optical contrast, pleasing and striking colors and unusually low power consumption. Particularly advantageous is the fact that these display devices may exhibit non-linear behavior (sharp thresholds) which permit multiplexing. This is highly advantageous in display device applications.
Claims26
An electrochemical display device comprising
- (a) positive and negative electrodes
- (b) electrochemical solution comprising organic solvent with pKa greater than 9, active species which change color under the influence of an electrical signal and electrolyte consisting essentially of ammonium halide characterized in that the active species comprises organic quinone selected from the group consisting of benzoquinone, naphthaquinone, anthraquinone, benzanthrenequinone, diphenylquinone, dibenzanthraquinone, phenanthrenequinones, benz[.alpha.]anthracene-7,12dione, ethylanthraquinone, tertiarybutylanthraquinone, isoviolanthrone, pyrenequinone, perylenequinone, chrysenequinone, benzpyrenequinone, pyranthrone, flavanthrone and anthanthrone.
Dependencies are inferred from the claim text.