1. A voltage compensation method of a liquid crystal display device is characterized by comprising the following steps:

driving the common electrode by an alternating voltage to generate a common electrode voltage, and driving the pixel electrode by the alternating voltage to generate a pixel voltage;

when the voltage of the common electrode is converted and before the pixel voltage of the pixel electrode is updated, generating a pixel voltage difference on the pixel electrode; and

and providing a common electrode compensation voltage to compensate the pixel voltage difference, so that the voltage difference between the pixel electrode and the common electrode is the same.

2. The voltage compensation method of claim 1, wherein the step of compensating the common electrode compensation voltage to the pixel voltage difference is performed by supplying the common electrode compensation voltage while the common electrode voltage and the common electrode compensation voltage are varied.

3. The voltage compensation method of claim 1, wherein the step of compensating the common electrode compensation voltage to the pixel voltage difference provides the common electrode compensation voltage in a voltage variation state in which the common electrode voltage is varied first.

4. The method as claimed in claim 1, wherein the step of compensating the common electrode compensation voltage to the pixel voltage difference provides the common electrode compensation voltage to the pixel electrode in a voltage variation state where the common electrode compensation voltage is first varied.

5. A voltage compensation circuit for a liquid crystal display device, comprising:

the thin film transistor comprises a grid electrode, a source electrode and a drain electrode, wherein the grid electrode is used for receiving a voltage signal, the voltage signal drives the thin film transistor to be switched on or switched off, and the drain electrode is coupled with the pixel electrode;

a storage capacitor including a first terminal coupled to the pixel electrode and a second terminal coupled to the common electrode;

the liquid crystal capacitor comprises a first end and a second end, wherein the first end is coupled with the pixel electrode, the second end is coupled with the common electrode, and the liquid crystal capacitor is connected with the storage capacitor in parallel and receives the common electrode voltage of the common electrode together; and

the compensation capacitor comprises a first end and a second end, wherein the first end is coupled with the pixel electrode, the second end is used for receiving a common electrode compensation voltage, the storage capacitor is connected with the liquid crystal capacitor in parallel, the compensation capacitor is coupled with the storage capacitor and the liquid crystal capacitor, and the compensation capacitor provides the common electrode compensation voltage to compensate the voltage difference generated at the two ends of the liquid crystal capacitor when the common electrode voltage is converted and before the pixel voltage of the pixel electrode is updated, so that the voltage difference of the pixel electrode and the common electrode is the same.

6. The voltage compensation circuit of claim 5, wherein the common electrode compensation voltage is supplied to the pixel electrode while the common electrode voltage and the common electrode compensation voltage vary in voltage.

7. The voltage compensation circuit of claim 5, wherein the common electrode compensation voltage is provided to the pixel electrode in a voltage variation state in which the common electrode voltage is varied first.

8. The voltage compensation circuit of claim 5, wherein the common electrode compensation voltage compensation is provided to the pixel electrode in a voltage variation state in which the common electrode compensation voltage is first varied.

9. The voltage compensation circuit of claim 5, wherein the common electrode compensation voltage is greater than the common electrode voltage.

10. A voltage compensation circuit for a liquid crystal display device, comprising:

the thin film transistor comprises a grid electrode, a source electrode and a drain electrode, wherein the grid electrode is used for receiving a voltage signal, the voltage signal drives the thin film transistor to be switched on or switched off, and the drain electrode is coupled with the pixel electrode;

a storage capacitor including a first terminal coupled to the pixel electrode and a second terminal for receiving a common electrode compensation voltage; and

the liquid crystal capacitor comprises a first end and a second end, wherein the first end is coupled with the pixel electrode, the second end is coupled with a common electrode and receives a common electrode voltage, the liquid crystal capacitor is connected with the storage capacitor in parallel, and the storage capacitor correspondingly provides the common electrode compensation voltage according to the pixel voltage change of the pixel electrode to compensate the voltage difference generated at the two ends of the liquid crystal capacitor, so that the voltage difference between the pixel electrode and the common electrode is the same.

11. The voltage compensation circuit of a liquid crystal display device of claim 10, wherein the common electrode compensation voltage is greater than the common electrode voltage.

12. The voltage compensation circuit of a liquid crystal display device according to claim 10, wherein the common electrode compensation voltage is supplied while the common electrode voltage and the common electrode compensation voltage are varied in voltage.

13. The voltage compensation circuit of claim 10, wherein the common electrode compensation voltage is provided to the pixel electrode in a voltage variation state in which the common electrode voltage is varied first.

14. The voltage compensation circuit of claim 10, wherein the common electrode compensation voltage compensation is provided to the pixel electrode in a voltage variation state in which the common electrode compensation voltage is first varied.

Background

Accordingly, in response to the increasing popularity of the current handheld mobile devices, the demand for low power consumption lcd screens is increasing, and therefore, it is necessary to use the method of driving the common electrode with ac voltage to reduce the output voltage range of the data driving Integrated Circuit (IC), thereby achieving the demand of reducing power consumption. However, when the common electrode is driven by an ac voltage, the voltage difference between the two ends of the liquid crystal capacitor is changed by the capacitive coupling effect caused by the voltage change of the common electrode, which affects the display effect. Therefore, how to use the ac voltage to drive the common electrode is an urgent problem to be solved to compensate the voltage difference between the two ends of the liquid crystal capacitor and improve the display effect.

Disclosure of Invention

The application provides a common electrode voltage compensation circuit and a method thereof, which are used for solving the problems that the voltage difference at two ends of a liquid crystal capacitor can be changed and the display effect is influenced due to the capacitance coupling effect caused by the change of the common electrode voltage.

In order to solve the above problems, the present application is implemented as follows: the application provides a voltage compensation method of a liquid crystal display device, which comprises the steps that a common electrode is driven by alternating voltage to generate common electrode voltage, and pixel electrodes are driven by the alternating voltage to generate pixel voltage; when the voltage of the common electrode is converted and before the pixel voltage of the pixel electrode is updated, the pixel voltage difference is generated on the pixel electrode, and at the moment, the compensation voltage of the common electrode is provided to compensate the pixel voltage difference generated on the pixel electrode, so that the voltage difference between the pixel electrode and the common electrode is the same.

In this embodiment, the present application provides a voltage compensation circuit of a liquid crystal display device, including a thin film transistor, a storage capacitor, a liquid crystal capacitor, and a compensation capacitor. The thin film transistor comprises a grid, a source electrode and a drain electrode, wherein the grid is used for receiving a voltage signal, the voltage signal drives the thin film transistor to be switched on or switched off, and the drain electrode is coupled with the pixel electrode. The storage capacitor comprises a first end and a second end, wherein the first end of the storage capacitor is coupled with the pixel electrode, and the second end of the storage capacitor is coupled with the common electrode. The liquid crystal capacitor comprises a first end and a second end, wherein the first end of the liquid crystal capacitor is coupled with the pixel electrode, the second end of the liquid crystal capacitor is coupled with the common electrode, and the liquid crystal capacitor is connected with the storage capacitor in parallel and receives the common electrode voltage of the common electrode together. The compensation capacitor comprises a first end and a second end, the first end of the compensation capacitor is coupled with the pixel electrode, the second end of the compensation capacitor is used for receiving the common electrode compensation voltage, the storage capacitor is connected with the liquid crystal capacitor in parallel, the compensation capacitor is coupled with the storage capacitor and the liquid crystal capacitor, and when the common electrode voltage is converted and before the pixel electrode is updated, the common electrode compensation voltage is provided to compensate the voltage difference reduced by the two ends of the liquid crystal capacitor, so that the voltage difference of the pixel electrode and the common electrode is the same.

In this embodiment, the present application further provides a voltage compensation circuit of a liquid crystal display device, including a thin film transistor, a storage capacitor and a liquid crystal capacitor. The thin film transistor comprises a grid, a source electrode and a drain electrode, wherein the grid is used for receiving a voltage signal, the voltage signal drives the thin film transistor to be switched on or switched off, and the drain electrode is coupled with the pixel electrode. The storage capacitor comprises a first end and a second end, wherein the first end of the storage capacitor is coupled with the pixel electrode, and the second end of the storage capacitor is used for receiving the common electrode compensation voltage. The liquid crystal capacitor comprises a first end and a second end, the first end of the liquid crystal capacitor is coupled with the pixel electrode, the second end of the liquid crystal capacitor is coupled with the common electrode and receives the voltage of the common electrode, and the liquid crystal capacitor is connected with the storage capacitor in parallel. The storage capacitor correspondingly provides the reduced voltage difference at two ends of the compensation liquid crystal capacitor according to the pixel voltage change of the pixel electrode, so that the voltage difference between the pixel electrode and the common electrode is the same.

In the embodiments of the present application, the voltage compensation circuit and the method thereof of the liquid crystal display device mainly aim to compensate the voltage difference between two ends of the liquid crystal capacitor under the condition of using the alternating voltage to drive the common electrode and before the pixel electrode is updated, thereby improving the visual effect.

Drawings

FIG. 1 is a flow chart of the steps of the present application.

Fig. 2 is a circuit diagram of a first embodiment of the present application.

Fig. 3 is a circuit diagram of a second embodiment of the present application.

Fig. 4 is a voltage waveform diagram of the present application.

Fig. 5 is a voltage waveform diagram of the present application.

Fig. 6 is a voltage waveform diagram of the present application.

Description of reference numerals:

S10-S14

10 thin film transistor

102 grid

104 source electrode

106 drain electrode

12 storage capacitor

14 liquid crystal capacitor

16 compensating capacitance

18 pixel electrode

20 common electrode

VCOM _ COPM common electrode compensation voltage

Delta Vp1 voltage variation

Delta Vp2 voltage variation

Delta VCOM voltage variation

Detailed Description

For further understanding and appreciation of the features and advantages achieved by the present application, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings, in which:

in the basic structure of a liquid crystal display device, the liquid crystal display device is mainly composed of an upper substrate and a lower substrate (glass substrates), wherein the upper substrate is provided with a color filter structure which comprises a black matrix for shielding light leakage, color light layers (red, green and blue) for forming colors, and an upper electrode for providing a common electrode. The lower substrate is provided with an Array side, the thin film transistor is arranged on a lower substrate Array (Array), the Array side of the lower substrate is also provided with a scanning Line (Scan Bus Line) and a Data Line (Data Bus Line) which are in a matrix shape, the grid Electrode (Gate) of the thin film transistor is connected to the scanning Line, the Source Electrode (Source) of the thin film transistor is connected to the Data Line, and the Drain Electrode (Drain) of the thin film transistor is connected to a Pixel Electrode (Pixel Electrode). In order to improve the voltage holding operation and achieve the display quality, a storage capacitor is connected in parallel to the liquid crystal capacitor. An alignment film is covered on the upper side of the lower substrate array side to make the liquid crystal have a pretilt angle. A Spacer (Spacer) for maintaining the distance between the two substrates is disposed between the upper and lower substrates, and liquid crystal is injected into the upper and lower substrates and fixed in the display panel by frame glue. The upper part of the upper substrate and the lower part of the lower substrate are adhered with polaroids to enable light rays to be polarized into linear polarized light, a backlight module is arranged below the polaroid of the lower substrate, and the light source of the liquid crystal display device is mainly emitted by the backlight module. The structure of the liquid crystal display device is designed in the prior art, and will not be described herein.

Due to the effect of the parasitic capacitance of the lcd device itself and the stray capacitance between the electrodes, the effective voltage applied to the lcd device varies, which causes the display to Flicker (Flicker), display non-uniformity, crosstalk (Cross Talk), Image Sticking (Image Sticking), and Gray-Scale Inversion (Gray-Scale Inversion), which affect the quality of the display. Therefore, the present application provides a method for improving the poor picture quality, please refer to fig. 1, which is a flowchart illustrating the steps of the present application. The voltage compensation method of the liquid crystal display device includes step S10, driving the common electrode by the ac voltage to generate a common electrode voltage, and driving a pixel electrode by the ac voltage to generate a pixel voltage. In step S12, a pixel voltage difference is generated on the pixel electrode during the common electrode voltage transition and before the pixel voltage of the pixel electrode is updated, i.e. before the pixel data is updated. Next, step S14 is executed to provide a common electrode compensation voltage to compensate the pixel voltage difference, that is, a voltage difference is generated between two ends of the liquid crystal capacitor in the pixel electrode, which is a pixel voltage lost on the pixel electrode, and further affects the display performance of the display frame.

For further details of the operation of the voltage compensation circuit, please refer to fig. 2, which is a circuit diagram of a first embodiment of the present application. The voltage compensation circuit of the liquid crystal display device includes a thin film transistor 10, a storage capacitor 12, a liquid crystal capacitor 14 and a compensation capacitor 16. The thin film transistor 10 includes a gate 102, a source 104 and a drain 106, and the drain 106 is coupled to a pixel electrode 18. The storage capacitor 12 includes a first terminal and a second terminal, the first terminal of the storage capacitor 12 is coupled to the pixel electrode 18, and the second terminal of the storage capacitor 12 is coupled to a common electrode 20. The liquid crystal capacitor 14 includes a first terminal and a second terminal, the first terminal of the liquid crystal capacitor 14 is coupled to the pixel electrode 18, the second terminal of the liquid crystal capacitor 14 is coupled to a common electrode 20, and the liquid crystal capacitor 14 is connected in parallel with the storage capacitor 12 and commonly receives a common electrode voltage of the common electrode 20. The compensation capacitor 16 includes a first terminal and a second terminal, the first terminal of the compensation capacitor 16 is coupled to the pixel electrode 18, and the second terminal of the compensation capacitor 16 is used for receiving a common electrode compensation voltage (VCOM _ COPM). The storage capacitor 12 is connected in parallel with the liquid crystal capacitor 14, and the compensation capacitor 16 is coupled to the storage capacitor 12 and the liquid crystal capacitor 14, in the first embodiment, the circuit is designed such that the storage capacitor 12, the liquid crystal capacitor 14 and the compensation capacitor 16 are connected in parallel, although the present application is not limited to the circuit connection manner of the compensation capacitor 16. When the common electrode voltage of the compensation capacitor 16 is switched and before the pixel voltage of the pixel electrode is updated, the compensation capacitor 16 provides the common electrode compensation voltage to compensate the voltage difference generated at the two ends of the liquid crystal capacitor 14, i.e. the pixel voltage difference, so that the voltage difference between the pixel electrode 18 and the common electrode 20 is the same.

In detail, each tft 10 is coupled to a liquid crystal capacitor 14, and a circuit of the storage capacitor 12 in parallel represents a display point, and a basic Pixel (Pixel) requires three display points, which represent three primary colors of red, green, and blue. Taking a 1024 × 768 resolution display panel as an example, there are 1024 × 768 pixels in total, and each pixel has three display points, so there are 1024 × 768 × 3 display points in total, and about 236 ten thousand thin film transistors 10 are on the lower substrate array side. The capacitance of the liquid crystal capacitor 14 is about 0.1pF, since the liquid crystal capacitor 14 cannot hold the voltage until the next frame data is updated, in other words, the frame rate of 60Hz is taken as an example, about 16ms is required, but the charged liquid crystal capacitor 14 cannot hold the voltage until the next time the tft 10 is recharged, so that the voltage variation is unstable and the displayed gray scale is incorrect. Therefore, the storage capacitor 12 in this circuit functions to keep the charged voltage until the next frame refresh. The tft 10 is used as a switch to determine whether the voltage on the source 104 is charged to a predetermined gray level, i.e., the liquid crystal alignment direction is controlled by the output voltage of the tft 10, which affects the transmittance and generates the gray level color effect.

When the voltage on the scan line is raised from a low voltage to a high voltage (scan state), the gate 102 of the tft 10 receives a high voltage signal and is driven to turn on (on state), and the voltage on the data line enters the pixel electrode through a channel formed by the source 104 and the drain 106 of the tft 10. When the voltage on the scan line is reduced from a high voltage to a low voltage, the thin film transistor 10 receives a low voltage signal and is in an off state, the ac voltage drives the common electrode 20 to generate a common electrode voltage, the ac voltage drives the pixel electrode 18 to generate a pixel voltage, the liquid crystal capacitor 14 and the storage capacitor 12 together receive the common electrode voltage of the common electrode 20, the voltage division effect of the liquid crystal capacitor 14 and the storage capacitor 12 and the capacitive coupling effect of the liquid crystal capacitor 14 and the storage capacitor 12, the voltage variation of the common electrode 20 generates a Feed-through voltage (Feed through voltage) to the pixel electrode 18 which is smaller than the voltage difference when the common electrode 20 is varied, that is, the voltage difference between the first terminal and the second terminal of the liquid crystal capacitor 14 is varied, and before the pixel voltage of the pixel electrode 18 is updated, the first terminal and the second terminal of the liquid crystal capacitor 14 maintain an erroneous voltage difference, thereby affecting the display of the display screen. It should be noted that, in the first embodiment, before the pixel electrode 18 is refreshed, the compensation capacitor 16 receives the common electrode compensation voltage, and the common electrode compensation voltage compensates the pixel voltage lost on the pixel electrode 18, that is, compensates the voltage difference between the first terminal and the second terminal of the liquid crystal capacitor 14, so as to make the voltage difference between the pixel electrode 18 and the common electrode 20 the same.

In addition to the above-mentioned voltage compensation circuit design, please refer to fig. 3, which is a circuit diagram of a second embodiment of the present application. The voltage compensation circuit of the liquid crystal display device includes a thin film transistor 10, a storage capacitor 12 and a liquid crystal capacitor 14. The thin film transistor 10 includes a gate 102, a source 104 and a drain 106, the gate 102 is used for receiving a voltage signal and driving to turn on or off correspondingly, and the drain 104 is coupled to a pixel electrode 18. The storage capacitor 12 includes a first terminal and a second terminal, the first terminal of the storage capacitor 12 is coupled to the pixel electrode 18, and the second terminal of the storage capacitor 12 is used for receiving a common electrode compensation voltage. The liquid crystal capacitor 14 includes a first terminal and a second terminal, the first terminal of the liquid crystal capacitor 14 is coupled to the pixel electrode 18, the second terminal of the liquid crystal capacitor 14 is coupled to a common electrode 20 and receives a common electrode voltage, and the liquid crystal capacitor 14 is connected in parallel with the storage capacitor 12. The storage capacitor 12 compensates the voltage difference generated across the liquid crystal capacitor 14 by providing a common electrode compensation voltage according to the pixel voltage variation of the pixel electrode 18, so that the voltage difference between the pixel electrode 18 and the common electrode 20 is the same. In detail, the voltage level setting of the pixel electrode is not started from the zero voltage level (except for the initial power-on), but is started from the voltage level set at the previous screen update. When the polarity of the voltage level at the previous time is negative, the liquid crystal capacitor 14 is discharged, and the polarity of the voltage level set for the image update at this time is positive, so that the liquid crystal capacitor 14 is charged. Due to the capacitive coupling effect generated by the voltage variation of the common electrode through the storage capacitor 12 and the liquid crystal capacitor 14, a voltage difference between the first terminal and the second terminal of the liquid crystal capacitor 14 is varied. Therefore, before the next frame update, the common electrode compensation voltage is provided to the liquid crystal capacitor 14 through the storage capacitor 12, that is, the voltage difference between the first terminal and the second terminal of the liquid crystal capacitor 14 is compensated, so that the voltage difference between the pixel electrode 18 and the common electrode 20 is the same.

In the circuit diagram architecture of the first and second embodiments, the common electrode compensation voltage compensation is provided to the pixel electrode 18 when the common electrode voltage and the common electrode compensation voltage change, or in any voltage change state where the common electrode compensation voltage changes first, so that the voltage difference between the pixel electrode 18 and the common electrode 20 is the same before the gate 102 is turned on, that is, before the next frame update.

Please refer to fig. 4, which is a voltage waveform diagram of the present application. In this embodiment, a voltage change state in which the common electrode voltage changes first is described as an example. The common electrode 20 is driven by the ac voltage, the common electrode 20 changes from a low voltage level to a high voltage level, the voltage change amount of the common electrode 20 is Δ VCOM, because of the capacitive coupling effect generated by the liquid crystal capacitor 14 and the storage capacitor 12, the voltage of the pixel electrode 18 cannot be raised to the same high voltage level of the common electrode 20, so that the voltage variation of the pixel electrode 18 is Δ Vp1 smaller than the voltage variation Δ VCOM of the common electrode 20, i.e. the voltage difference generated between the first terminal and the second terminal of the liquid crystal capacitor 14 is compensated, the compensation capacitor 16 provides the common electrode compensation voltage to compensate the voltage variation Δ Vp2 on the pixel electrode 18, i.e. the voltage difference between the first terminal and the second terminal of the liquid crystal capacitor 14 is compensated, so that the voltage variation Δ Vp1+ Δ Vp2 on the pixel electrode 18 is the same as the voltage variation Δ VCOM on the common electrode 20, thereby achieving the same effect of the voltage difference between the pixel electrode 18 and the common electrode 20. Similarly, the voltage variation of the common electrode 20 is Δ VCOM when the common electrode 20 is changed from the high voltage level to the low voltage level, so that the voltage of the pixel electrode 18 cannot be pulled down to the low voltage level of the common electrode 20 to be consistent, the voltage variation of the pixel electrode 18 is Δ Vp1 smaller than the voltage variation of the common electrode 20 to be Δ VCOM, that is, the voltage difference generated between the first end and the second end of the compensation liquid crystal capacitor 14 is compensated, the common electrode compensation voltage VCOM _ COPM is provided through the compensation capacitor 16 to compensate the voltage variation Δ Vp2 on the pixel electrode 18, and the voltage variation Δ Vp1+ Δ Vp2 on the pixel electrode 18 is the same as the voltage variation Δ VCOM on the common electrode 20, so as to achieve the same effect of the voltage difference between the pixel electrode 18 and the common electrode 20. The common electrode compensation voltage is greater than the voltage of the common electrode 20, so that the common electrode 20 can convert the capacitance coupling effect generated on the pixel electrode 18 to compensate the capacitance coupling effect to achieve the best effect.

In another embodiment, please also add fig. 5, which is a voltage waveform diagram of the present application. In the present embodiment, the common electrode voltage and the voltage variation of the common electrode compensation voltage are exemplified. The common electrode 20 is driven by the ac voltage, and the common electrode 20 provides the common electrode compensation voltage compensation to the pixel electrode 18 via the compensation capacitor 16 while changing the voltage variation Δ VCOM of the common electrode 20 from the low voltage level to the high voltage level, and the common electrode voltage and the common electrode compensation voltage are simultaneously changed, such that the voltage variation Δ Vp1+ Δ Vp2 on the pixel electrode 18 is the same as the voltage variation Δ VCOM of the common electrode 20, thereby making the voltage difference between the pixel electrode 18 and the common electrode 20 the same. Similarly, the common electrode 20 is changed from the high voltage level to the low voltage level, and the compensation capacitor 16 provides the common electrode compensation voltage to compensate the voltage variation Δ Vp2 on the pixel electrode 18, so that the voltage variation Δ Vp1+ Δ Vp2 on the pixel electrode 18 is the same as the voltage variation Δ VCOM on the common electrode 20, thereby making the voltage difference between the pixel electrode 18 and the common electrode 20 the same.

In another embodiment, please also add fig. 6, which is a voltage waveform diagram of the present application. In this embodiment, a voltage change state in which the common electrode compensation voltage changes first is described as an example. When the common electrode 20 is driven by the ac voltage, before the voltage of the common electrode 20 changes from the low voltage level state to the high voltage level state, the compensation capacitor 16 provides the common electrode compensation voltage to compensate the voltage change Δ Vp2 on the pixel electrode 18, so that the voltage change Δ Vp1+ Δ Vp2 on the pixel electrode 18 is the same as the voltage change Δ VCOM of the common electrode 20, i.e. the voltage difference between the first terminal and the second terminal of the liquid crystal capacitor 14 is compensated, thereby making the voltage difference between the pixel electrode 18 and the common electrode 20 the same. Similarly, before the common electrode 20 changes from the high voltage level to the low voltage level, the voltage variation Δ VCOM of the common electrode 20 is not able to be pulled down to the low voltage level of the common electrode 20 by the capacitive coupling effect, that is, the first terminal and the second terminal of the compensation liquid crystal capacitor 14 generate a voltage difference, the compensation voltage is provided to the common electrode via the compensation capacitor 16 to compensate the voltage variation Δ Vp2 on the pixel electrode 18, and the voltage variation Δ Vp1+ Δ Vp2 on the pixel electrode 18 is the same as the voltage variation Δ VCOM of the common electrode 20, so that the voltage difference between the pixel electrode 18 and the common electrode 20 is the same.

To sum up, the present application is applicable to the design of a low power consumption liquid crystal display device, and under the condition that an alternating voltage is used to drive a common electrode and a pixel electrode in a voltage compensation circuit, when the voltage of the common electrode is converted, and before the pixel voltage of the pixel electrode is updated, the common electrode compensation voltage is provided to compensate the voltage difference reduced at two ends of a liquid crystal capacitor due to the capacitive coupling effect, and after the common electrode compensation voltage is provided, the voltage difference between the pixel electrode and the common electrode is the same, namely, the voltage difference is equal before and after the voltage conversion of the common electrode, so that the cross voltage on the liquid crystal capacitor corresponds to the gray scale to be displayed, and the visual effect problem can be improved.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all equivalent changes and modifications in the shape, structure, characteristics and spirit described in the claims of the present application should be included in the scope of the claims of the present application.