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Liquid crystal display device and driving method thereof

  • US 7,724,228 B2
  • Filed: 06/24/2005
  • Issued: 05/25/2010
  • Est. Priority Date: 11/29/2004
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal display device comprising:

  • a liquid crystal panel having horizontal lines and vertical lines arranged in a matrix configuration;

    a controller for receiving interlace pixel data every frame and generating a control signal including a gate shift pulse signal, each frame including an odd field and an even field, and dummy pixel data being generated from the interlace pixel data at each field;

    a polar signal generator for generating a unipolar signal and a bipolar signal in response to the gate shift pulse signal, the unipolar signal having one of a low voltage and a high voltage at each field, and a polarity of the bipolar signal being inverted by a unit of at least two fields;

    a gamma voltage generator for changing positive and negative gamma voltages that have different value using the unipolar signal at each field, the positive and negative gamma voltage each increasing as much as a high voltage of the unipolar signal for an odd field and decreasing as much as a low voltage of the unipolar signal for an even field;

    a gate driver for supplying a scan signal to the horizontal lines; and

    a data driver for inverting polarities of the interlace pixel data and the dummy pixel data by the unit of at least two fields according to the bipolar signal, converting the interlace pixel data and the dummy pixel data into the changed positive gamma voltage or the changed negative gamma voltage from the gamma voltage generator for at least two fields, and supplying the changed gamma voltage to the vertical lines,wherein the data driver gamma-converts the interlace pixel data according to the gamma voltage increases as much as the high voltage for the odd field and gamma-converts the dummy pixel data according to the gamma voltage decreases as much as the low voltage for the even field,wherein the gamma voltage generator includes a positive polar gamma voltage generator and a negative polar gamma voltage generator,wherein the positive gamma voltage generator changes the positive gamma voltage using the unipolar signal at each field, the positive gamma voltage increasing as much as a high voltage when the unipolar signal has the high voltage for the odd field and decreasing as much as a low voltage when the unipolar signal has the low voltage for the even field,wherein the negative gamma voltage generator changes the negative gamma voltage using the unipolar signal at each field, the negative gamma voltage increasing as much as a high voltage when the unipolar signal has the high voltage for the odd field and decreasing as much as a low voltage when the unipolar signal has the low voltage for the even field.

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