Electrochromic display device

Details Electrochromic display device Electrochromic display device

1980-10-10

1983-08-30

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340763, 340811, 350357, G09G 334

Patent

active

044019840

ABSTRACT:
An electrochromic display device has an electrolyte contained between two spaced-apart substrates. A set of display elements including first and second display elements are disposed on the surface of at least one of the substrates in contact with the electrolyte, and a counter electrode is disposed on the surface of the other substrate in contact with the electrolyte. Each of the display elements comprises a transparent electrode and an electrochromic layer disposed on the transparent electrode such that the display element exhibits either colored or bleached states depending on the amount of electric charge held by the display element. A charge transfer voltage is selectively applied between preselected bleached and colored display elements to effect transfer of electric charges through the electrolyte to thereby change the display state. Deterioration of the coloration exhibited by the colored display elements is compensated by applying a constant voltage between the first display element and the counter electrode, the value of the constant voltage being lower than that of the charge transfer voltage, and control circuitry controls the application of the constant voltage such that the constant voltage is applied before each predetermined number of transfers of electric charge held by the first display element to the second display element thereby maintaining the degree of coloration of the colored display elements.

REFERENCES:
patent: 4092637 (1978-05-01), Barclay et al.
patent: 4181406 (1980-01-01), Kohara et al.
patent: 4205903 (1980-06-01), Inami et al.
patent: 4229080 (1980-10-01), Take et al.
patent: 4242681 (1980-12-01), Tabata
patent: 4256380 (1981-03-01), Barclay et al.

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