Electro-optical device for the display of dark symbols composed

Details Electro-optical device for the display of dark symbols composed Electro-optical device for the display of dark symbols composed

1979-04-05

1980-12-23

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340756, 350336, G09F 935

Patent

active

042413443

ABSTRACT:
An electro-optical display for the display of dark symbols against a bright background, wherein except for fine separation lines the front and rear cell plates are almost entirely covered with isolated electrode elements. The regions of overlap between these various front and rear electrode elements define the areas of the selectable display segments. The display employs an electro-optic media requiring no polarizers, for example, cholesteric liquid crystals to which has been added pleochroic dyes, or electrophoretic suspensions. The display device is addressed through the application of appropriate signals to the electrodes so that a vanishingly small potential difference lies across the liquid crystal layer in the region of the selected display segments which remain dark. In all the other regions of the display, however, there exists a potential difference which is larger than the transition voltage of the electro-optical medium, and these regions therefore appear as a bright background. The addressing is preferably carried out using unipolar pulsed signals which are applied to the electrode elements of the front and rear cell plates, with those electrodes corresponding to optically selected display segments receiving signals having the same phase and amplitude.

REFERENCES:
patent: 3647280 (1972-03-01), Klein et al.
patent: 3740717 (1973-06-01), Huener et al.
patent: 3891306 (1975-06-01), Mitomo et al.
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3930719 (1976-01-01), Madrid et al.
patent: 4035060 (1977-07-01), Tsunoda et al.
patent: 4105297 (1978-08-01), Shimizu
patent: 4153344 (1979-05-01), Hamada et al.

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