Method of driving liquid crystal matrix display device to obtain

Details Method of driving liquid crystal matrix display device to obtain Method of driving liquid crystal matrix display device to obtain

1976-11-17

1978-07-11

Curtis, Marshall M.

Communications: electrical

Systems

Portable self-contained

340336, 350333, G09F 932

Patent

active

041005406

ABSTRACT:
A method of driving a liquid crystal display matrix, in which digit drive signals are applied to digit electrodes and segment drive signals are applied to segment electrodes. Each of the digit drive signals has first pulse components of a first pulse width varying at a plurality of voltage potentials in a first predetermined sequence during each cycle, and a second pulse component of a second pulse width having a selected one of the voltage potentials during each half cycle. Each of the segment drive signals has first pulse components of the first pulse width varying at at least two of the voltage potentials in a second predetermined sequence, and a second pulse component of the second pulse width having a voltage potential equal to that of the second pulse component of the digit drive signal. The second pulse components of the digit and segment drive signals are in synchronism with each other, whereby the potential difference across the electrodes will be zero to reduce the root-mean-square voltage applied to the liquid crystal display matrix. The duty cycles of the digit drive signals and the segment drive signals are varied in dependence on an ambient temperature.

REFERENCES:
patent: 3891307 (1975-06-01), Tsukamoto et al.
patent: 3921162 (1975-11-01), Fukai et al.
patent: 3922667 (1975-11-01), Ueda et al.
patent: 3949242 (1976-04-01), Hirasawa et al.
patent: 3955187 (1976-05-01), Bigelow
patent: 3976362 (1976-08-01), Kawakami

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