Simultaneous color and bleach of ECD

Details Simultaneous color and bleach of ECD Simultaneous color and bleach of ECD

1978-12-20

1981-03-17

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340701, 350357, G09F 900

Patent

active

042570468

ABSTRACT:
Driving circuitry is disclosed for electrochromic displays, the driving circuits providing specific characteristics necessary for such displays. Particularly, apparatus is provided to minimize variations in the optical density and in the contrast between the various segments of a device. Further, simultaneous coloring and bleaching signals are provided to the display, thereby avoiding an undesired visual effect of unsynchronized formation for a character on a display device. The circuitry moreover includes components to prevent repeated energization of a segment in a display device. Additionally, circuitry is provided for generating bleach and color signals for the display. Additionally, a power supply for electrochromic displays, requiring bipolar outputs, is disclosed utilizing a single, unipolar, unregulated source therein.

REFERENCES:
patent: 3987433 (1976-10-01), Kennedy
patent: 4096412 (1978-06-01), Sekiya et al.
patent: 4117475 (1978-09-01), Ebihara et al.

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