Electrochromic display device

Details Electrochromic display device Electrochromic display device

1979-12-17

1981-10-27

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340785, 340166EL, 350357, G02F 117

Patent

active

042976952

ABSTRACT:
An electrochromic display device is operated by the selective application of electrical signals to first and second electrode matrix addressing means, the potential of the signals being sufficient to produce local color changes in an electrochromic material. Each local color change may be brought about by a short `expose` pulse with a potential above a threshold for coloration, but with insufficient charge to cause coloration, followed by a longer `develop` pulse which is below the threshold potential. The first and second matrix addressing means respectively provide these pulses. The electrodes for the two sets of pulses needed to produce an image are multiplexed to substantially reduce the number of driving circuits required.

REFERENCES:
patent: 3811072 (1974-05-01), Purchase
patent: 3891306 (1975-06-01), Mitomo et al.
patent: 3982239 (1976-09-01), Sherr
patent: 3989355 (1976-11-01), Wilmer

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