Dot-inversion data driver for liquid crystal display device
AssigneeFujitsu Limited
InventorsShinya Udo, Masatoshi Kokubun
Life of this patent
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Abstract
In a data driver 10A of a dot-inversion driving type, the outputs of voltage buffer amplifiers B1 to B12 are connected to respective data bus lines D1 to D12 of a LCD panel, short-circuiting switches S1, S3, S5, S7, S9 and S11 are connected between ones of every other adjacent data bus lines concerned with the same display color, and interconnecting lines on first and second rows are arranged in a staggered configuration. These short-circuiting switches are formed at one sides of every other data bus lines, and turned on by a control circuit 13 when the outputs of the voltage buffer amplifier are in a high impedance state.
Claims12
A data driver for a liquid crystal display device having data bus lines, comprising voltage buffer amplifiers each outputting an analog gradation voltage to provide to one of said data bus lines such that voltages of every nearest two of said data bus lines with respect to a same display color are opposite to each other in polarity, said data driver further comprising:
- short-circuiting switches for electrically connecting every other nearest two of said data bus lines with respect to a same display color;
- and
- a control circuit turning on said short-circuiting switches when said voltage buffer amplifiers are electrically isolated from said data bus lines.
A liquid crystal display device comprising:
- an LCD panel having a plurality of data bus lines and a plurality of scan bus lines;
- a scan driver connected to said plurality of scan bus lines;
- and
- a data driver comprising voltage buffer amplifiers each outputting an analog gradation voltage to provide to one of said data bus lines such that voltages of every nearest two of said data bus lines with respect to a same display color are opposite to each other in polarity,
- wherein said data driver further comprises:
- short-circuiting switches for electrically connecting every other nearest two of said data bus lines with respect to a same display color;
- and
- a control circuit turning on said short-circuiting switches when said voltage buffer amplifiers are electrically isolated from said data bus lines.
Dependencies are inferred from the claim text.