Electrochromic display device

Details Electrochromic display device Electrochromic display device

1980-07-03

1982-09-14

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340713, 350357, G09G 334

Patent

active

043498183

ABSTRACT:
An electrochromic display device comprises; an electrolyte held between two substrates at least one of which is transparent. A display electrode is formed on a surface of one substrate and has an electrochromic substance film formed thereon, the surface being in contact with the electrolyte. A first counter electrode is formed on a counter surface of the other substrate in opposed spaced-apart relationship with respect to the display electrode, and a second counter electrode is formed on a face of either one of the substrates, the face being in contact with the electrolyte. Circuitry applies a first voltage between the display electrode and the first counter electrode to effect coloration of the display electrode, and applies a second voltage between the first and second counter electrodes to establish an electric field therebetween effective to remove a negative ion region which forms in the vicinity of the first counter electrode during coloration of the display electrode.

REFERENCES:
patent: 4175836 (1979-11-01), Redman et al.
patent: 4181406 (1980-01-01), Kohara et al.
patent: 4229080 (1980-10-01), Take et al.

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