Uniform coloration control in an electrochromic display of the s

Details Uniform coloration control in an electrochromic display of the s Uniform coloration control in an electrochromic display of the s

1978-04-04

1980-07-01

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340763, 340811, 350357, G06F 314, G09F 932

Patent

active

042109078

ABSTRACT:
A driving system is provided for an electrochromic display device in which the coloration state is maintained for several hours through several days of the removal of the coloration voltage as long as the electrochromic display device is held in an electrically opened state. The electrochromic display device includes a predetermined number of display segments, each of the combinations of the display segments defining a different one of the desired display patterns. The display segments placed in the coloration state are electrically connected to each other during the memory period in order to uniform the coloration degree of each of the selected display segments. In a preferred form, a detection means is provided for detecting the potential of the selected display segments, which are held in the memory coloration state. The write-in, or, coloration operation is again conducted when the potential of the selected display segments becomes higher than a preselected level.

REFERENCES:
patent: 3950077 (1976-04-01), Jasinski
patent: 4057739 (1977-11-01), Otake

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