Drive device for driving a matrix-type LCD apparatus
AssigneeSharp Kabushiki Kaisha
InventorsYoshiharu Kanatani, Hirofumi Fukuoka, Shigeyuki Uehira
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Abstract
A drive device for driving a matrix-type LCD apparatus comprises a voltage signal supply means for outputting a plurality of voltage signals with different levels. The voltage signals have alternately positive and negative levels with respect to an AC reference voltage applied to a counter-electrode of the LCD apparatus. The AC reference voltage is approximately 180.degree. out-of-phase with the voltage signals. The drive device also comprises a signal electrode drive means which selects one of the voltage signals depending upon an input digital video signal, and which supplies the selected voltage signal to a signal electrode of the LCD apparatus.
Claims10
In a drive device for driving a display apparatus having a display unit, said display unit including a plurality of signal electrodes arranged in juxtaposition and at least one counter electrode,
- said drive device comprises:
- a voltage signal supply means for outputting a plurality of voltage signals with different levels, said plurality of voltage signals having alternately positive and negative levels with respect to an AC reference voltage applied to said counter electrode, said AC reference voltage being approximately 180 degrees out-of-phase with said plurality of voltage signals;
- and
- a signal electrode drive means for selecting one of said plurality of voltage signals in accordance with an input digital video signal, and for supplying said selected voltage signal to one of said signal electrodes.
In a drive device for driving a display apparatus having a display unit, said display unit including:
- a plurality of signal electrodes arranged in juxtaposition;
- a plurality of scanning electrodes intersecting said signal electrodes;
- a plurality of pixel electrodes which are disposed respectively at the intersections of said signal electrodes and said scanning electrodes;
- at least one counter electrode opposing said pixel electrodes;
- and supplemental capacitance electrodes for forming capacitors in cooperation with said pixel electrodes,
- said drive device comprises:
- a voltage applying means for applying an AC voltage to said counter electrode;
- a signal electrode drive means for AC-driving said signal electrodes, the level of the AC voltage varying and having phases which are in-phase or approximately 180 degrees out-of-phase from that of said AC voltage applied to said counter electrode;
- and
- a supplemental capacitance electrode drive means for applying an AC voltage to said counter electrode and driving said supplemental capacitance electrodes including a drive means composed of said voltage applying means, the drive of said supplemental electrodes being in phase of said AC voltage.
Dependencies are inferred from the claim text.