Liquid crystal display device
AssigneeIBM Corporation
InventorsKazuo Sekiya, Hajime Nakamura
Life of this patent
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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.
Claims17
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 stores a predicted capacitance value of each pixel and calculates said overdrive voltage based on the predicted capacitance value.
A liquid crystal display device comprising:
- 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
- a controller 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.
A liquid crystal display drive circuit comprising:
- 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;
- storage means for storing the predicted capacitance value;
- and
- voltage calculating means for calculating a voltage to be applied to each pixel based on targeted brightness at one refresh cycle later and the stored capacitance value.
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:
- predicting a capacitance value where each pixel will reach at one refresh cycle later when applying a predetermined voltage for the input pixel value;
- 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.
A method for driving a liquid crystal display wherein a brightness change delays relative to a capacitance change, the method comprising the steps of:
- predicting a capacitance value of each pixel of said liquid crystal display when applying a predetermined voltage;
- 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.
A program for directing a computer to drive a liquid crystal display device, the program comprising the functions of:
- 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;
- 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 displayed at one refresh cycle later and the stored capacitance value.
Dependencies are inferred from the claim text.