Apparatus for driving liquid crystal display device wherein the

Details Apparatus for driving liquid crystal display device wherein the Apparatus for driving liquid crystal display device wherein the

1975-10-03

1977-08-30

Curtis, Marshall M.

Communications: electrical

Systems

Portable self-contained

350160LC, 340336, G09F 932

Patent

active

040457915

ABSTRACT:
Apparatus driving liquid crystal display device including a liquid crystal layer provided with electrodes on its two opposite surfaces, comprising means for applying a first signal for designating the electrode position and a voltage signal having a higher frequency to the electrodes on one surface, and for applying an input signal and the signal of said higher frequency to the electrodes on the other surface. The signals are controlled by another signal of different frequency to drive the display device with an ac voltage. Temperature compensation can be performed by varying the magnitude or the frequency of the voltage signal according to the temperature level.

REFERENCES:
patent: 3410999 (1968-11-01), Fergason et al.
patent: 3524726 (1970-08-01), DeKoster
patent: 3529156 (1970-09-01), Fergason et al.
patent: 3551026 (1970-12-01), Heilmeier
patent: 3725898 (1973-04-01), Canton

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