Electrochromic display devices

Details Electrochromic display devices Electrochromic display devices

1981-05-29

1983-08-16

Trafton, David L.

Communications: electrical

Visual indication

Movable

340763, 340785, 350357, G09G 316

Patent

active

043994369

ABSTRACT:
An electrochromic display device comprises a plurality of display segmented electrodes and first additional electrodes, a layer of an electrochromic material in contact with each of the display segmented electrodes and the first additional electrodes, a first connecting circuit for selectively connecting each of the display segmented electrodes into one of two groups, depending on a display pattern to be indicated, a counting circuit for counting the electrodes and determining the difference in display area between the two groups of display segmented electrodes, a circuit responsive to the difference in display area for connecting each of the first additional electrodes into one of the two groups of the display segmented electrodes, a power supply for supplying power to each of the two groups of the first additional electrodes and the display segmented electrodes, and a second additional electrode for keeping the total amount of charge for coloring all the display electrodes constant.

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

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