Electrochromic display device

Details Electrochromic display device Electrochromic display device

1977-08-23

1980-01-01

Davie, James W.

G02F 117

Patent

active

041814061

ABSTRACT:
An improved electrochromic display device having a transparent container containing an indication electrode, a counter-electrode and an electrochromic solution contacting the electrodes is disclosed. The improvement is that the counter-electrode is provided with a coating of a reduction product of the color displaying ions or an oxidation product of the color displaying ions of the electrochromic solution. By means of forming the coating of a color displaying product, when a current flows across the indication electrode and counter-electrode, the same redox reaction takes place at both electrodes but the reactions proceed in opposite directions. As a result, the redox reaction can be caused to proceed with a voltage lower than the redox potential of the reaction itself and hence, electrode contamination by additional electrolytic reaction products can be avoided thereby prolonging the life of the device.

REFERENCES:
patent: 3854794 (1974-12-01), Van Dam
patent: 3879108 (1975-04-01), Berets
patent: 3961842 (1976-06-01), Jasinski
J. Bruinink, "Electrochromic Display Devices", Nonemissive Electro-optic Displays, Plenum Press, New York, (1975), pp. 201-218.
C. J. Shoot et al., "New Electrochromic Memory Display", Appl. Phys. Lett., vol. 23, No. 2, Jul. 15, 1973, pp. 64-65.

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