Liquid crystal display device
First Claim
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1. A liquid crystal display device comprising:
- a liquid crystal cell forming an image display area;
a driver applying a voltage to said liquid crystal cell; and
an overdrive controller controlling said driver to apply an overdrive voltage that exceeds a targeted pixel value to said liquid crystal cell;
wherein said overdrive controller predicts a capacitance value of a pixel at one frame period later when applying a predetermined voltage to the pixel with a certain capacitance value and stores the predicted capacitance value of each pixel and calculates said overdrive voltage based on the predicted capacitance value, wherein the predicted capacitance value accounts for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell.
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Abstract
A liquid crystal display drive circuit includes capacitance predicting section for predicting a capacitance value each pixel will reach at one refresh cycle later when applying a predetermined voltage for targeted brightness, a frame buffer for storing the predicted capacitance value, and overdrive voltage calculating section for calculating a voltage to be applied to each pixel based on targeted brightness at one refresh cycle later and the stored capacitance value in frame buffer.
239 Citations
18 Claims
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1. A liquid crystal display device comprising:
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a liquid crystal cell forming an image display area; a driver applying a voltage to said liquid crystal cell; and an overdrive controller controlling said driver to apply an overdrive voltage that exceeds a targeted pixel value to said liquid crystal cell;
wherein said overdrive controller predicts a capacitance value of a pixel at one frame period later when applying a predetermined voltage to the pixel with a certain capacitance value and stores the predicted capacitance value of each pixel and calculates said overdrive voltage based on the predicted capacitance value, wherein the predicted capacitance value accounts for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell. - View Dependent Claims (2, 3, 4, 16)
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5. A liquid crystal display device comprising:
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a liquid crystal cell displaying an image when a voltage is applied to each pixel having a TFT structure a driver applying a voltage to each pixel of said liquid crystal cell; and
acontroller controlling the driver to apply a voltage that exceeds an applied voltage to said liquid crystal cell when displaying targeted brightness on said liquid crystal cell, wherein said controller comprises voltage calculating means for calculating a voltage to be applied to said liquid crystal cell based on targeted brightness at one refresh cycle later corresponding to a pixel value to be displayed this time and a present capacitance value of the pixel that is predicted in advance, said controller further comprising; capacitance predicting means for predicting a capacitance value of the pixel that will be reached after the refresh cycle when applying said voltage calculated by said voltage calculating means to the pixel with the present capacitance value, the predicted capacitance value accounting for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell; and storage means for storing said capacitance value predicted by said capacitance predicting means, wherein the voltage calculating means calculates the voltage to be applied and the capacitance predicting means predicts the capacitance value, respectively, based on said capacitance value stored in said storage means. - View Dependent Claims (6, 7, 8)
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9. A liquid crystal display drive circuit comprising:
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capacitance predicting means for predicting a capacitance value where each pixel will reach at one refresh cycle later when applying a predetermined voltage for targeted brightness, the predicted capacitance value accounting for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell; storage means for storing the predicted capacitance value; and
voltage calculatingmeans for calculating a voltage to be applied to each pixel based on targeted brightness at one refresh cycle later and the stored capacitance value. - View Dependent Claims (10, 11)
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12. A method for driving a liquid crystal display, wherein an input pixel value is overdriven to output a modified pixel value, the method comprising the steps of:
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predicting a capacitance value where each pixel will reach at one refresh cycle later when applying a predetermined voltage for the input pixel value, the predicted capacitance value accounting for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell; storing the predicted capacitance value; and calculating an overdrive voltage to be applied to each pixel based on an input pixel value at one refresh cycle later and the stored capacitance value. - View Dependent Claims (13, 17)
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14. A method for driving a liquid crystal display wherein a brightness change delays relative to a capacitance change, the method comprising the steps of:
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predicting a capacitance value of each pixel of said liquid crystal display when applying a predetermined voltage, the predicted capacitance value accounting for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell; calculating a voltage exceeding the targeted pixel value based on an input targeted pixel value with using said predicted capacitance value as a parameter; and supplying a predetermined voltage to said liquid crystal display based on said calculated voltage. - View Dependent Claims (18)
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15. A program for directing a computer to drive a liquid crystal display device, the program comprising the functions of:
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predicting a capacitance value where each pixel will reach at one refresh cycle later when applying a predetermined voltage to the liquid crystal display device, the predicted capacitance value accounting for dynamic changes in capacitance resulting from prior applications of voltages to said liquid crystal cell; storing the predicted capacitance value in a buffer of the computer; and
calculating a voltage to be applied to each pixel based on a pixel value to be displayedat one refresh cycle later and the stored capacitance value.
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Specification