Addressing liquid crystal cells

Details Addressing liquid crystal cells Addressing liquid crystal cells

1988-07-01

1990-04-17

James, Andrew J.

Communications: electrical

Land vehicle alarms or indicators

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

350331T, 350350S, 340713, 340805, G02F 113, G09G 302

Patent

active

049174690

ABSTRACT:
The working temperature range of a 2 .mu.m thick negative dielectric anisotropy smectic C phase filled ferroelectric liquid crystal cell that is addressed on a matrix basis with balanced bipolar data pulses and unipolar strobe pulses is extended by the inclusion of a temperature sensor to use the temperature of the cell to control the magnitudes of the data and strobe pulse waveforms and to provide, at least at high temperatures, a stabilization waveform with a frequency twice the fundamental frequency of the data pulse waveform.

REFERENCES:
patent: 4045791 (1972-08-01), Fukai et al.
patent: 4100540 (1978-07-01), Fujita et al.
patent: 4242679 (1980-12-01), Morozumi et al.
patent: 4586039 (1986-04-01), Nonomura et al.
patent: 4625204 (1986-11-01), Clerc
patent: 4705345 (1987-11-01), Ayliffe

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