Liquid crystal display apparatus and a driving method thereof
First Claim
1. A liquid crystal display in two or more line inversion, the liquid crystal display comprising:
- a liquid crystal panel having a plurality of gate lines and a plurality of data lines intersecting each other, and a plurality of pixels provided near the intersections of the gate lines and the data lines;
a gate driver for sequentially scanning the gate lines of the liquid crystal panel with a gate-on voltage and a gate-off voltage;
a data driver for selecting gray voltages corresponding to image data, and applying the selected gray voltages to the data lines of the liquid crystal panel;
a voltage generator for generating and outputting the gate-on voltage and the gate-off voltage for the gate driver and the gray voltages for the data driver; and
a timing controller for generating control signals required for the gate driver and the data driver, and converting data format of the input image data from an external graphics source suitable for the data driver, wherein the timing controller controls polarity of the image data to be reversed every two or more rows, combines the image data for the pixels with the polarity inversion and compensation data for excessive charging of the pixels by a predetermined level, and outputs the combined data.
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Abstract
The present invention relates to a liquid crystal display with two or more line inversion. The timing controller of the liquid crystal display controls polarity of the image data to be reversed every two or more rows, combines the image data for the pixels with the polarity inversion and compensation data for excessive charging of the pixels by a predetermined level, and outputs the combined data. For this purpose, the timing controller includes a vector table for storing the number of frames and lines to be compensated for a frequency of a clock signal, a frame frequency, and a line frequency. In order to apply voltages for excessive charging of the pixel with polarity inversion, the compensation data stored in the vector table is combined with the image data from the external graphics source, and the liquid crystal panel is driven using the combined data. The compensation data are determined in advance in consideration of the brightness difference at the difference locations on the display panel and the frame charge level compensation for frames.
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Citations
12 Claims
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1. A liquid crystal display in two or more line inversion, the liquid crystal display comprising:
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a liquid crystal panel having a plurality of gate lines and a plurality of data lines intersecting each other, and a plurality of pixels provided near the intersections of the gate lines and the data lines;
a gate driver for sequentially scanning the gate lines of the liquid crystal panel with a gate-on voltage and a gate-off voltage;
a data driver for selecting gray voltages corresponding to image data, and applying the selected gray voltages to the data lines of the liquid crystal panel;
a voltage generator for generating and outputting the gate-on voltage and the gate-off voltage for the gate driver and the gray voltages for the data driver; and
a timing controller for generating control signals required for the gate driver and the data driver, and converting data format of the input image data from an external graphics source suitable for the data driver, wherein the timing controller controls polarity of the image data to be reversed every two or more rows, combines the image data for the pixels with the polarity inversion and compensation data for excessive charging of the pixels by a predetermined level, and outputs the combined data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A liquid crystal display two or more line inversion, the liquid crystal display comprising:
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a liquid crystal panel having a plurality of gate lines and a plurality of data lines intersecting each other, and a plurality of pixels provided near the intersections of the gate lines and the data lines;
a gate driver for sequentially scanning the gate lines of the liquid crystal panel with a gate-on voltage and a gate-off voltage;
a data driver for selecting gray voltages corresponding to image data, and applying the selected gray voltages to the data lines of the liquid crystal panel;
a voltage generator for generating and outputting the gate-on voltage and the gate-off voltage for the gate driver and the gray voltages for the data driver; and
a timing controller for generating control signals required for the gate driver and the data driver, and converting data format of the input image data from an external graphics source suitable for the data driver, wherein the timing controller controls the polarity of the image data to be reversed every two or more rows, and combines image data and compensation data for the image data such that the pixels with polarity changing from negative to positive are supplied with voltages having a level higher than initial gray voltages and the pixels with polarity changing from positive to negative are supplied with voltages having a level lower than initial gray voltages. - View Dependent Claims (9, 10)
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11. A method of driving a liquid crystal display, the method comprising:
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counting the number of frames for input RGB data using a synchronization signal;
determining whether a current frame is a compensation frame;
reading out compensation data previously stored in a vector table in case it is determined that the current frame is the compensation frame;
recognizing that the current frame is a normal frame in case it is determined that the current frame is not the compensation frame; and
combining the compensation data with the RGB data and outputting the compensation data obtained in the reading out and the normal frame data obtained in the recognition. - View Dependent Claims (12)
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Specification