Method of turning off the display in electrochromic display devi

Details Method of turning off the display in electrochromic display devi Method of turning off the display in electrochromic display devi

1977-05-19

1979-09-04

Davie, James W.

Communications: electrical

Land vehicle alarms or indicators

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

340785, G02F 117

Patent

active

041666763

ABSTRACT:
The display in a diffusion type electrochromic display device is turned off with high response by applying an A.C. input voltage having a frequency of one to ten times as high as the cut-off frequency. The diffusion type electrochromic display device is an EC display device which uses an EC composition consisting of an EC compound coloring in a reduced state and a solvent in which the solubility of the compound to the solvent is 10.sup.-2 mol/(100 g solvent) or more in a reduced state and 10.sup.-1 mol/(100 g solvent) or more in an oxidized state. The cut-off frequency is a critical frequency at a freqency higher than which the oxidization or reduction of the EC compound cannot follow the change in the input voltage, which is normally 20 to 50 Hz.

REFERENCES:
patent: 3987433 (1976-10-01), Kennedy

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