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Public voltage compensation circuit and method, and liquid crystal display device

A common voltage and compensation method technology, applied in the direction of adjusting electrical variables, static indicators, instruments, etc., can solve the problems of reducing circuit accuracy, affecting the display effect, and inability to compensate and adjust the common voltage, so as to achieve signal interference suppression and accurate compensation. The effect of high degree and improved display effect

Active Publication Date: 2012-12-26
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors found that the above-mentioned common voltage compensation circuit is mainly realized by an analog circuit, and the analog circuit itself tends to produce some drifts in the environment changes, resulting in a reduction in the circuit accuracy, thus causing the common voltage compensation circuit to be unable to accurately adjust the common voltage. Compensation adjustment, affecting the display effect

Method used

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  • Public voltage compensation circuit and method, and liquid crystal display device
  • Public voltage compensation circuit and method, and liquid crystal display device
  • Public voltage compensation circuit and method, and liquid crystal display device

Examples

Experimental program
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Effect test

Embodiment 1

[0048] An embodiment of the present invention provides a common voltage compensation method, such as figure 2 As shown, the common voltage compensation method includes:

[0049] Step 201, compare the feedback signal with the reference common voltage value Vref output by the common voltage generating circuit, and output the comparison result, the feedback signal is the common voltage actually obtained by the common electrode;

[0050] The liquid crystal display device includes: a liquid crystal panel and a common voltage generating circuit, the liquid crystal panel is provided with a common electrode, one end of the common electrode is connected to the common voltage generating circuit as an input end, and the other end of the common electrode is used as a feedback end, and the actual voltage of the common electrode is output. The obtained common voltage is used as a feedback voltage for controlling compensation. Comparing the feedback voltage (that is, the common voltage act...

Embodiment 2

[0060] A schematic structural diagram of a common voltage compensation circuit provided by an embodiment of the present invention, as shown in image 3 As shown, the common voltage compensation circuit 3 is provided with two input terminals and an output terminal, the input terminals are respectively connected to the common voltage generation circuit 2 and the common electrode 11 arranged on the liquid crystal panel, and the output terminal is also connected to the common electrode 11 , the common voltage compensation circuit 3 includes:

[0061] The comparison unit 31 is configured to receive the feedback voltage Vpanel and the reference common voltage Vref output by the common voltage generating circuit 2, compare the feedback voltage Vpanel with the reference common voltage Vref, and output the comparison result, the feedback voltage Vpanel is actually obtained on the common electrode 11 public voltage;

[0062] The logic unit 32 generates a compensation control signal acc...

specific Embodiment 3

[0080] Such as Figure 6 As shown, it is the third specific embodiment of the compensation unit of the public voltage compensation circuit of the present invention, and the compensation unit 33 includes:

[0081] N-type field effect transistor and P-type field effect transistor form a complementary symmetrical structure;

[0082] The gates of the N-type field effect transistor and the P-type field effect transistor are all connected to the logic unit 32, the source (input terminal) of the N-type field effect transistor inputs the first level signal V1, and the source of the P-type field effect transistor The second level signal V2 is input, and the drains (output terminals) of the N-type field effect transistor and the P-type field effect transistor are connected to the common electrode.

[0083] Wherein, the compensation control signal output by the logic unit 32 is any one of the first control signal, the second control signal and the third control signal. The voltage of t...

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Abstract

The invention discloses a public voltage compensation circuit, a public voltage compensation method and a liquid crystal display (LCD) device, belonging to the display field. According to the public voltage compensation circuit, the public voltage compensation method and the liquid crystal display device,, the compensation accuracy is high, more stable public voltages can be acquired, phenomena such as residual images, abnormal gray scale display, crosstalk and the like caused by public voltage offset can be avoided, and the display effect is improved. The public voltage compensation method comprises the following steps: comparing a feedback voltage with a reference public voltage output by a public voltage generation circuit; generating a compensation control signal according to a comparison result; and according to the compensation control signal, compensating a public voltage. The public voltage compensation circuit comprises a comparison unit, a logic unit and a compensation unit.

Description

technical field [0001] The invention relates to the display field, in particular to a common voltage compensation circuit, a method and a liquid crystal display device. Background technique [0002] Liquid crystal display devices are widely used in electronic equipment, such as monitors, televisions, mobile phones, and electronic photo frames, due to their unique advantages such as light weight, small size, low power consumption, and low radiation. [0003] The liquid crystal display device uses the pixel electrode and the common electrode to apply a driving voltage difference to the liquid crystal layer sandwiched therebetween, so that the liquid crystal molecules in the liquid crystal layer are rotated, and the passing amount of light is controlled to display the picture. The driving voltage difference is relative to the potential (common voltage) applied to the common electrode. Therefore, a stable common voltage is required to drive the liquid crystal display, but due to...

Claims

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Application Information

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IPC IPC(8): G09G3/20G09G3/36
CPCG09G3/3655G09G2320/0209G09G3/3696G05F1/10
Inventor 张春兵
Owner BOE TECH GRP CO LTD
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