Gradation potential generation circuit, data driver of display device and the display device

A technology for generating circuits and display devices, applied in static indicators, instruments, etc., can solve the problems of switching noise, deterioration of display image quality, etc., and achieve the effect of reducing circuit area and high display quality

Inactive Publication Date: 2008-07-23
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, when the switches S1 to S64 are changed from open to closed, switching noise is generated due to sudden high impedance
Then, the quality of the displayed image deteriorates significantly due to switching noise generated while the voltage is being written to the pixel

Method used

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  • Gradation potential generation circuit, data driver of display device and the display device
  • Gradation potential generation circuit, data driver of display device and the display device
  • Gradation potential generation circuit, data driver of display device and the display device

Examples

Experimental program
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no. 1 example

[0029] A display device according to the present embodiment will now be explained with reference to FIG. 1 . FIG. 1 is a block diagram showing the structure of a liquid crystal display device. This liquid crystal display device is constituted by a timing controller IC1 , a gate driver (a gate-side liquid crystal drive circuit) IC2 , a data driver (a source-side liquid crystal drive circuit) IC3 , and a liquid crystal panel 4 . A plurality of gate driver ICs 2 are provided along one side of the liquid crystal panel 4 . Similarly, a plurality of data driver ICs 3 are provided along the other side of the liquid crystal panel 4 . That is, both terminals of the gate driver IC2 and the data driver IC3 are connected to the liquid crystal panel 4 . Also, the other end opposite to the end of the gate driver IC2 and the data driver IC3 connected to the liquid crystal panel 4 are connected to substrates 7 and 8 such as flexible printed circuits (FPC). The substrate 8 connected to the ...

no. 2 example

[0046] As the display device according to the present embodiment, the liquid crystal display device of the first embodiment can be used. A liquid crystal display device according to the embodiment is explained with reference to FIG. 7 . FIG. 7 is a block diagram showing the structure of the liquid crystal display device. The liquid crystal display device is composed of a timing controller IC1, a gate driver IC2, a data driver IC3, a liquid crystal panel 4 and a reference potential generating IC40. It is to be noted that elements in the liquid crystal display device of the present embodiment are the same as those of the first embodiment except for the reference potential generating IC 40, and thus their descriptions are omitted. In this embodiment, a reference potential generating IC 40 for generating reference potentials V0 to V8 is included. Next, common V0 to V8 are supplied to each data driver IC3 through the substrates 9 and 8 of the liquid crystal display device.

[00...

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PUM

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Abstract

The invention relates to a gray scale potential generating circuit, a data driver and a display device of a display device. The gray-scale potential generating circuit includes: a first gradient resistance circuit, the first and second reference voltages are provided at both ends thereof to generate j gray-scale potentials (j is an integer of 2 or greater) and the generated The j grayscale potentials of are output to j first nodes, wherein the j grayscale potentials are generated by dividing the first and second reference voltages; the second gradient resistance circuit is generated from the j grayscale potentials generated by the first gradient resistance circuit k gray-scale potentials (where j>k) are generated in the potentials, and k switches, according to the first control signal, the k gray-scale potentials generated by the second gradient resistance circuit are provided to k of the j first nodes the first node.

Description

technical field [0001] The present invention relates to a gradation potential generating circuit of a display device, a data driver and a display device. Background technique [0002] In the information and communication age, liquid crystal display devices (LCDs) are widely used in OA, consumer and industrial fields as an indispensable flat panel display device due to their slimness, thinness and low power consumption. Generally, in such a liquid crystal display device, a liquid crystal display IC (liquid crystal drive circuit) having a grayscale potential generating circuit is arranged. A plurality of gray-scale potentials are generated by such a gray-scale potential generating circuit. Next, according to the image data signal, one of the plurality of gray scale potentials is selected by the decoding circuit. The current of the gray scale potential selected by the decoding circuit is amplified by the voltage follower. The amplified grayscale potential is supplied to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
CPCG09G3/3648G09G3/3688G09G3/2011G09G2300/0426G09G2320/0276
Inventor 梅田谦吾土弘
Owner RENESAS ELECTRONICS CORP
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