Electrochromic display and method for making same

Details Electrochromic display and method for making same Electrochromic display and method for making same

1978-12-28

1980-12-02

Davie, James W.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

29570, 427 77, G02F 117

Patent

active

042367921

ABSTRACT:
Disclosed is an electrochromic display having an electrolyte of optimized cationic mobility and a counter electrode of optimized electronic mobility. Preferably the display comprises (a) a front substrate with selectively actuable transparent electrodes and image-forming electrochromic layers thereon, (b) an acidified aqueous electrolyte containing a sufficient quantity of highly mobile hydrogen ions for coloration of the electrochromic layers and (c) a rear substrate spaced from the front substrate carrying a counter electrode in contact with the electrolyte, the counter electrode being in the form of a layer comprising predominantly an alkali tungsten bronze, preferably sodium and or potassium tungsten bronze, in the high temperature heat treated condition which exhibits enhanced electronic mobility. A process for making the display is also disclosed.

REFERENCES:
patent: 4012831 (1977-03-01), Leibowitz
patent: 4106862 (1978-08-01), Bayard
E. O. Brimm et al., "Sodium and Potassium Tungsten Bronzes," Journal of the American Chemical Society, vol. 73, pp. 5427-5732, Nov. 1951.

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