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Common voltage generation circuit, source drive circuit and liquid crystal display device

A common voltage and generating circuit technology, which is applied in the field of source drive circuits, liquid crystal display devices, and common voltage generating circuits, can solve problems such as reverse color of liquid crystal display panels, and achieve the effect of avoiding reverse color phenomenon

Active Publication Date: 2018-11-23
KUSN INFOVISION OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a common voltage generation circuit, a source drive circuit and a liquid crystal display device, which can solve the problem of reverse color phenomenon on the liquid crystal display panel

Method used

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  • Common voltage generation circuit, source drive circuit and liquid crystal display device
  • Common voltage generation circuit, source drive circuit and liquid crystal display device
  • Common voltage generation circuit, source drive circuit and liquid crystal display device

Examples

Experimental program
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Effect test

no. 1 example

[0025] Please refer to figure 1 , figure 1 It is a schematic connection diagram of a common voltage generating circuit of an embodiment. Such as figure 1 As shown, the common voltage generating circuit of this embodiment includes a common voltage generating circuit 100, the common voltage generating circuit 100 receives the first common voltage VCOM1 and the second common voltage VCOM2, and reverses the polarity according to the output of the source driving circuit 200 The control signal POL outputs the first AC common voltage ACVCOM1 and the second AC common voltage ACVCOM2 with opposite polarities, and the first AC common voltage ACVCOM1 or the second AC common voltage ACVCOM2 and the source driving circuit 200 output on the corresponding data line data signal ( figure 1 S1, S2 . . . Sn) have the same polarity, and the data signal and the AC common voltage with the same polarity as the data signal act together on the same pixel unit of the display panel 300 .

[0026] Sp...

no. 2 example

[0032] figure 2 It is a circuit connection diagram of a common voltage generating circuit of an embodiment. Such as figure 2 As shown, this embodiment provides a specific circuit connection of the common voltage generating circuit 100 in the common voltage generating circuit. The common voltage generating circuit 100 includes a first switching element T1 , a second switching element T2 , a third switching element T3 , a fourth switching element T4 and a first inverting element 101 . The first switch element T1 includes a first control terminal, a first channel terminal and a second channel terminal, the first control terminal of the first switch element T1 receives the polarity inversion control signal POL, and the second channel terminal of the first switch element T1 Receive the second common voltage VCOM2. The second switch element T2 includes a second control terminal, a third channel terminal, and a fourth channel terminal. The second control terminal of the second s...

no. 3 example

[0042] image 3 It is a related waveform diagram of the output voltage of the common voltage generating circuit of an embodiment. In this example, the polarity of the first AC common voltage ACVCOM1 is the same as that of the data signal output by the source driver circuit 200 on the data lines of odd columns, and the second AC common voltage ACVCOM2 is consistent with the polarity of the data signals output by the source driver circuit 200 on the data lines of even columns. The polarity of the output data signal on the same, and can be obtained as image 3 The waveform diagram shown.

[0043] Specifically, the polarities of the first AC common voltage ACVCOM1 and the second AC common voltage ACVCOM2 follow each polarity reversal of the polarity reversal control signal POL, and, through the first AC common voltage ACVCOM1 and the source The polarity of the data signal Odd Source output by the electrode drive circuit 200 on the data lines of odd columns is consistent, so that...

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Abstract

The present invention provides a common voltage generation circuit. The common voltage generation circuit receives a first common voltage and a second common voltage, outputs a first alternating current common voltage and a second alternating current common voltage with opposite poles according to polarity-reversal control signals, and polarities of data signals output on corresponding data linesof the first alternating current common voltage or the second alternating current common voltage and the source drive circuit are consistent, and the data signals and the alternating current common voltages with the consistent polarity to the data signals are commonly acted the same pixel unit of a display panel. The present invention further provides a source drive circuit and a liquid crystal display device. The common voltage generation circuit, the source drive circuit and the liquid crystal display device allow the polarities of data signals output on corresponding data lines of the firstalternating current common voltage or the second alternating current common voltage and the source drive circuit to be consistent so as to avoid the generation of the inverse phenomenon on the liquidcrystal display panel.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a common voltage generating circuit, a source driving circuit and a liquid crystal display device. Background technique [0002] A liquid crystal display (Liquid Crystal Display, LCD) has many advantages such as thinness, energy saving, and no radiation, so it has gradually replaced the traditional cathode ray tube (CRT) display. Currently, liquid crystal displays are widely used in high-definition digital televisions, desktop computers, personal digital assistants (PDAs), notebook computers, mobile phones, digital cameras and other electronic devices. [0003] At present, in order to meet people's various needs for liquid crystal display performance, liquid crystal displays include display modes such as wide viewing angle display mode and narrow viewing angle display mode. The common voltages applied to the common electrodes in different display modes are not exactly the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3614G09G3/3688G09G3/3696
Inventor 王晴闫小能张若男吴二平
Owner KUSN INFOVISION OPTOELECTRONICS
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