Electrochromic display driver having interleaved write and erase

Details Electrochromic display driver having interleaved write and erase Electrochromic display driver having interleaved write and erase

1975-09-02

1976-10-19

Curtis, Marshall M.

Communications: electrical

Systems

With specific power supply

340324M, 58 23R, 58 50R, 350160R, G09F 932

Patent

active

039874338

ABSTRACT:
A driving circuit for an electrochromic display cell wherein write and erase of a segment is effected by an alternating or pulse signal. A write or erase potential is applied across a segment and common electrode during a half cycle of the alternating/pulse signal which is predetermined to have a (activation) period less than that which is required to effect complete coloring or bleaching of the segment. Therefore, several cycles of the alternating/pulse signal are necessary to effect complete coloring or bleaching of the segment.
The electrochromic display is caused to have the appearance of simultaneous writing and erasing of a plurality of segments by applying a write or erase potential to the selected segments during each alternate half cycle of the alternating/pulse signal. For example, the write potential is applied to one segment during the first half cycle and the erase potential is applied to another segment during the second half cycle of one alternating/pulse signal. In this manner, gradual fade-in and fade-out of those segments being updated is effected over a several cycle period.

REFERENCES:
patent: 3476460 (1969-11-01), Hansen et al.
patent: 3839857 (1974-10-01), Berets et al.
patent: 3878537 (1975-04-01), Roncillat et al.
patent: 3895372 (1975-07-01), Kaji et al.

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