Liquid crystal display device and driving method thereof
AssigneeLG.Philips LCD Co., Ltd.
InventorsJoo-Soo Lim, In-Byeong Kang
Life of this patent
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Abstract
A liquid crystal display device and a driving method for a liquid crystal display. The liquid crystal display device is formed to have thin film transistor conductive channels having an inverted “U”-shape. A shielding plate is provided to block incident light from reaching the conductive channels of the thin film transistors. This reduces or eliminates photo-induced leakage current and picture quality degradation. To prevent pixel electrode potential fluctuations caused by subsequent scan line drive signals, the liquid crystal display device is driven by scan signals that are sequentially applied from the mth gate line up to the first gate line.
Claims19
A liquid crystal display device comprising:
- a plurality of G gate lines;
- a plurality of D data lines that are perpendicular to and that cross the gate lines;
- a gate electrode that extends from a pth gate line toward a p+1th gate line, wherein p is greater than 1 and p+1 is less than or equal to G;
- and
- a thin film transistor comprised of a semiconductor layer over the gate electrode, a source electrode that extends over the semiconductor layer from a data line, and a drain electrode, wherein an inverted “U” shaped conductive channel is formed in the semiconductor layer when a gate signal is applied to the gate electrode;
- and
- a shielding plate for blocking incident light from reaching the conductive channel;
- wherein the source electrode blocks incident light from reaching the conductive channel.
A notebook computer, comprising:
- a housing comprised of a base and of a display case having an upper edge and a bottom edge;
- and
- a transmissive/reflective liquid crystal display device in the display case, the liquid crystal display device having a top that is adjacent the upper edge, wherein the liquid crystal display device includes
- a plurality of G gate lines, wherein the first gate line is adjacent the upper edge, and wherein the Gth gate line is adjacent the bottom edge;
- a plurality of data lines that are perpendicular to and cross the gate lines;
- a gate electrode on the pth gate line that extends toward the bottom edge;
- and
- a thin film transistor comprised of a semiconductor layer over the gate electrode, a source electrode that extends over the semiconductor layer from a data line, and a drain electrode, wherein an inverted “U” shaped conductive channel is formed in the semiconductor layer when a gate signal is applied to the gate electrode;
- and
- a shielding plate for blocking incident light from reaching the conductive channel;
- wherein the source electrode also blocks incident light from reaching the conductive channel.
A method of driving a liquid crystal display device comprised of gate lines G1 though GM, comprising:
- applying a gate signal voltage pulse to a p+1th gate line so as to form a plurality of inverted “U” shaped channels;
- and
- sequentially applying a gate signal voltage pulse to the pth gate line so as to form a plurality of inverted “U” shaped channels;
- and
- sequentially applying a gate signal voltage pulse to the p−1th gate line so as to form a plurality of inverted “U” shaped channels;
- wherein p+1 is less than or equal to M;
- and
- wherein p−1 is greater than or equal to 1.
Dependencies are inferred from the claim text.