Liquid crystal display cell having capacitance compensation

Details Liquid crystal display cell having capacitance compensation Liquid crystal display cell having capacitance compensation

1981-12-14

1984-01-10

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340713, 340784, 350334, G09G 336

Patent

active

044250274

ABSTRACT:
A liquid crystal display cell with thermal compensation of the degree of contrast comprises a measuring capacitor 12, 13 and a reference capacitor formed by two constituent reference capacitors 13, 15 and 14, 15 connected in series. The areas of the surfaces of the electrodes are so selected that the capacitances of the measuring and reference capacitors are approximately equal. The measuring and reference capacitors of the cell can be operated by excitation voltages of the same amplitude. The voltages which then appear at the terminals of the constituent reference capacitors are of lower amplitudes, corresponding to a region of the characteristics in which the capacitance is independent of temperature.

REFERENCES:
patent: 3705310 (1972-12-01), Wild
patent: 4278325 (1981-07-01), Kondo et al.
patent: 4298866 (1981-11-01), Hodemaekers
patent: 4390874 (1983-06-01), Woodside et al.

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