Liquid crystal matrix display device with polarity inversion of

Details Liquid crystal matrix display device with polarity inversion of Liquid crystal matrix display device with polarity inversion of

1988-11-28

1990-03-06

Moore, David K.

Communications: electrical

Land vehicle alarms or indicators

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

340784, 340805, G09G 300

Patent

active

049069845

ABSTRACT:
A liquid crystal display device includes a plurality of scanning electrodes, a plurality of signal electrodes, and a plurality of picture element electrodes connected to intersections of scanning and signal electrodes via a plurality of switching transistors. A plurality of counter electrodes are arranged opposite to the picture element electrodes. The polarity of display signals applied to the signal electrodes is inverted for a period equal to an integer multiple of a pulse width of a scanning pulse applied to the scanning electrodes. Signals of alternating polarity are applied to the counter electrodes in synchronism with the polarity inversion of the display signals. In this way, non-uniform display contrast along the signal electrode direction of the display screen is avoided by eliminating the stray capacitance timing differences according to the position of picture element electrodes along the signal electrode direction of the display screen.

REFERENCES:
patent: 4413256 (1983-11-01), Yasuda
patent: 4571585 (1986-02-01), Stein
patent: 4591848 (1986-05-01), Morozumi et al.
patent: 4626841 (1986-12-01), Togashi
patent: 4638310 (1987-01-01), Ayliffe
patent: 4710768 (1987-12-01), Takeda et al.

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