Electrochromic display device exhibiting uniform coloration dens

Details Electrochromic display device exhibiting uniform coloration dens Electrochromic display device exhibiting uniform coloration dens

1980-07-03

1983-08-30

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340713, 340763, 340811, 350357, 358239, G09G 334

Patent

active

044019831

ABSTRACT:
A driving circuit for an electrochromic display device in which electric charges for coloration in a colored segment group are transferred to a bleached segment group to change the display state by the application of a voltage between the colored segment group and the bleached segment group comprises an electric charge transfer control circuit for producing an electric charge transfer signal only when the display information displayed by the electrochromic display device is being changed, and an electric charge transfer-time control circuit for setting the electric charge transfer-time at a time more than the maximum transfer time required by the electrochromic display device both during low temperature operation and during electric charge transfer using the maximum number of segments for which electric charge transfer can be carried out by the electrochromic display device.

REFERENCES:
patent: 3972040 (1976-07-01), Hilsum et al.
patent: 4092637 (1978-05-01), Barclay et al.
patent: 4210907 (1980-07-01), Hamada et al.
patent: 4210909 (1980-07-01), Hamada et al.
patent: 4228431 (1980-10-01), Barclay et al.
patent: 4242681 (1980-12-01), Tabata

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