Liquid crystal display apparatus and drive circuitry used in the

Details Liquid crystal display apparatus and drive circuitry used in the Liquid crystal display apparatus and drive circuitry used in the

1997-08-14

2000-05-02

Saras, Steven J.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 98, 327108, G09G 336

Patent

active

06057819&

ABSTRACT:
A liquid crystal display apparatus is provided in which crosstalk (after-image extending from a line displayed on the screen) is eliminated. Drive circuitry used in the above type of apparatus is also provided. A delay circuit divides an alternating-current (AC) signal generated by an alternating-current (AC) signal circuit into two signals, i.e., a common AC signal (DF COM) and a segment AC signal (DF SEG). One signal is delayed later than the other. When the common AC signal is delayed later than the segment AC signal, white crosstalk (which is a white bar having a brightness level higher than a white background, appearing on the line extending from a narrow black bar displayed on the screen) is eliminated from the screen. On the other hand, when the segment AC signal is delayed later than the common AC signal, black crosstalk (which is a black bar having a brightness level slightly lower than a white background, emerging on the line extending from a thick black bar displayed on the screen) is removed from the screen. An integrating circuit or a delay line is employed as a delay function of the delay circuit.

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patent: 5489910 (1996-02-01), Kuwata et al.
patent: 5534892 (1996-07-01), Tagawa
patent: 5635865 (1997-06-01), Moon et al.

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