Active matrix liquid crystal display
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Accused Products
Abstract
An active matrix liquid crystal display apparatus that is adaptive for eliminating a flicker and a residual image as well as simplifying the circuit configuration thereof. In the apparatus, a plurality of pixels each includes a switching transistor having a second electrode connected to a gate electrode, a first electrode and a pixel electrode. Each of pluralities of data signal lines is connected to the second electrode associated with any one of the transistors, and each of pluralities of gate signal lines is connected to the gate electrode associated with any one of the transistors. A gate driver is connected to the plurality of gate signal lines, and it receives first and second voltages and outputs any one of the first and second voltages to drive the gate signal lines sequentially. The first voltage changes prior to exciting of successive gate signal lines.
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Citations
42 Claims
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1-9. -9. (canceled)
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10. An active matrix liquid crystal display apparatus, comprising:
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a plurality of pixels including switching transistors each having a gate electrode, a first electrode and a second electrode connected to a pixel electrode;
a plurality of data signal lines each connected to the first electrode associated with any one of the transistors;
a plurality of gate signal lines each connected to the gate electrode associated with any one of the transistors; and
a gate driver connected to the plurality of the gate signal lines, said gate driver receiving a first gate voltage and a second gate voltage and outputting any one of the first gate voltage and the second gate voltage to drive the gate signal lines sequentially, said first gate voltage reducing a voltage level substantially to a threshold voltage level but enough to maintain an on-state of the switching transistor prior to transitioning to the second gate voltage, wherein the second gate voltage has a voltage level that turns off the switching transistor. - View Dependent Claims (11, 12, 13, 14, 15, 19, 20, 21, 22, 23, 24)
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16. A method of driving an active matrix liquid crystal display apparatus including pixels defined by gate lines and signal lines, thin film transistors connected to the gate lines and the signal lines, and a gate driver connected to the gate lines and having a shift register, said method comprising:
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applying a first gate voltage and a second gate voltage;
the first gate voltage having a voltage level that turns on the switching transistor and the second gate voltage having a voltage level that turns off the switching transistor; and
supplying the first gate voltage and the second gate voltage selectively via a switching device, to the gate lines, said switching device being controlled by the shift register, said first gate voltage reducing a voltage level substantially to a threshold voltage level but enough to maintain an on-state of the switching transistor prior to transitioning to the second gate voltage. - View Dependent Claims (17, 18)
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25. A liquid crystal display (LCD) device, comprising:
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a plurality of pixels arranged in rows and columns, each pixel including, a pixel electrode, and a switching device having a control electrode, a first electrode, and a second electrode connected to the pixel electrode;
a plurality of data signal lines each connected to the first electrode of the switching device of each pixel in one of the columns;
a plurality of scanning signal lines each connected to the control electrode of the switching device of each pixel in one of the rows; and
a gate driver connected to the plurality of scanning signal lines, said gate driver receiving first and second control voltages and a scanning clock signal and, in response to the scanning clock signal, successively outputting the first control voltage to the scanning signal lines to drive the scanning signal lines, wherein the switching device of each pixel responds to the first control voltage to connect the first electrode with the pixel electrode, and responds to the second control voltage to disconnect the first electrode from the pixel electrode, wherein a voltage level of the first control voltage received by the gate driver changes during a period of the scanning clock signal prior to the driver selecting a successive scanning line, and wherein the voltage level of the first control voltage turns on the switching device and the voltage level of the first control voltage is reduced substantially to a threshold voltage level but enough to maintain an on-state of the switching device during the period of the scanning clock signal prior to the driver selecting the successive scanning line. - View Dependent Claims (26, 27, 28, 29)
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30. A method of driving a liquid crystal display device, having a plurality of gate electrodes, a plurality of contact electrodes, and a plurality of pixel electrodes connected to the plurality of gate electrodes, the method comprising:
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providing a plurality of first lines and a plurality of scanning lines that are arranged in a matrix pattern, wherein the plurality of first lines connect to the plurality of contact electrodes, and wherein the plurality of scanning lines connect to the plurality of gate electrodes;
sequentially applying a first voltage to each of the plurality of scanning lines, wherein the first voltage electrically connects the plurality of contact electrodes to the plurality of pixel electrodes; and
sequentially applying a second voltage to each of the plurality of scanning lines, wherein the second voltage electrically disconnects the plurality of contact electrodes from the plurality of pixel electrodes, wherein the second voltage is sequentially applied to each of the plurality of scanning lines after the application of the first voltage to each of the plurality of scanning lines but prior to the sequential application of the first voltage to another one of the plurality of scanning lines, said first voltage reducing a voltage level substantially to a threshold voltage level but enough to maintain a connection between the plurality of contact electrodes to the plurality of pixel electrodes prior to applying the second gate voltage. - View Dependent Claims (31, 32, 33, 34, 35)
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36. An active matrix liquid crystal display apparatus, comprising:
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a pixel having a pixel electrode and a switching transistor, the switching transistor including a gate electrode, a source electrode, and a drain electrode connected to the pixel electrode;
a data signal line connected to the source electrode;
a gate signal line connected to the gate electrode;
a gate driver connected to the gate signal line and outputting a gate signal having first and second voltage levels for driving the gate signal lines sequentially;
a high level gate voltage generator and a low level gate voltage generator electrically connected to the gate driver and outputting the first and second voltage levels to the gate driver, respectively, the high level gate voltage generator including a means for modulating the first voltage level of the gate signal; and
a data driver connected to the data signal line for applying a data signal to the data signal line. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification