Drive system for electrochromic display cell

Details Drive system for electrochromic display cell Drive system for electrochromic display cell

1982-12-10

1984-09-04

Miska, Vit W.

Horology: time measuring systems or devices

Displays or display device details

Optical

340785, 350357, G04C 1700, C09F 900, G02F 117

Patent

active

044694490

ABSTRACT:
A system for driving elements of an ECD cell, whereby each of at least two different color density states can be selectively designated for each element so that two different functions can be indicated by a single element. The selective designation is accomplished by comparing a command signal indicating the required current display state of an element with the contents of a memory circuit which stores the previous display state, the memory being capable of storing data representing at least two different display states. Any required change in the display state is thereby detected, and a predetermined amount of charge is accordingly supplied to or taken from the display element such as to produce the desired change in density state.

REFERENCES:
patent: Re28199 (1974-10-01), Deb et al.
patent: 3950936 (1976-04-01), Oguey et al.
patent: 3987433 (1976-10-01), Kennedy
patent: 4034550 (1977-07-01), Kouchi et al.
patent: 4057739 (1977-11-01), Otake
patent: 4077032 (1978-02-01), Volkman
patent: 4205903 (1980-06-01), Inami et al.

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