Driving method, driving circuit and display device

Abstract

The application discloses a driving method, a driving circuit and a display device. The driving method comprises the steps of detecting a temperature value of the display device, obtaining a VGH value corresponding to a current picture through a first temperature compensation lookup table according to the temperature value, monitoring an actual gray scale value of the current picture and comparing the actual gray scale value with an original gray scale value, cutting the VGH value according to a difference value, and driving the current picture by using the cut VGH value. The first temperature compensation lookup table comprises temperature values and corresponding VGH values, and the VGH value is a high level signal value of a scanning line of the display device. The application adjusts the temperature coefficient of the VGH value corresponding to the original gray scale value by detecting the actual gray scale value, that is, the cutting operation is performed, so that the compensation of the VGH value is not inaccurate due to the influence of the sensor temperature on the chip, and the temperature compensation failure is avoided.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a driving method, driving circuit and display device. Background Technology

[0002] As living standards improve, large-size, high-refresh-rate, and high-resolution display devices are becoming increasingly popular. However, high-specification products also come with more display problems. Affected by ambient temperature, display panels may exhibit abnormal lighting phenomena under high or low temperature conditions.

[0003] There are many reasons for abnormal lighting. Currently, the main reason is that the voltage value of the control input to the scan line in the display panel changes due to the influence of high and low temperatures. This causes the pixel's turn-on voltage VGH or turn-off voltage VGL to change, resulting in charging disorder and abnormal lighting. In order to ensure that the display panel is shipped normally, abnormal lighting has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this application is to provide a driving method, driving circuit, and display device, which aims to solve the problem of abnormal lighting of the display panel caused by the influence of ambient temperature.

[0005] This application discloses a driving method, including the following steps:

[0006] The temperature value displayed on the detection device;

[0007] The VGH value corresponding to the current screen is obtained by using the first temperature compensation lookup table based on the temperature value.

[0008] Monitor the actual grayscale value of the current image and compare it with the original grayscale value, and reduce the VGH value according to the difference;

[0009] Use the VGH value after step reduction to drive the display of the current screen;

[0010] The first temperature-compensated lookup table includes temperature values ​​and corresponding VGH values, where the VGH value is the high-level signal value of the scan line of the display device.

[0011] Optionally, the step of monitoring the actual grayscale value of the current image and comparing it with the original grayscale value, and then reducing the VGH value based on the difference, includes:

[0012] Divide the current screen into a first screen and a second screen along the data cable direction; and

[0013] The actual grayscale values ​​of the first and second images are monitored and compared with the corresponding original grayscale values. Based on the corresponding differences, the VGH values ​​corresponding to the current temperature value are reduced to obtain the reduced VGH values ​​of the first and second images.

[0014] The step of using the clipped VGH value to drive the display of the current screen includes:

[0015] The VGH value after level reduction for the first screen is used to drive the display of the corresponding first screen, and the VGH value after level reduction for the second screen is used to drive the display of the corresponding second screen.

[0016] Optionally, the number of scan lines corresponding to the first and second frames can be different.

[0017] Optionally, the step of monitoring the actual grayscale value of the current image and comparing it with the original grayscale value, and then reducing the VGH value based on the difference, includes:

[0018] Get the original grayscale value of the current image; and

[0019] The VGH value after grayscale reduction is obtained from the original grayscale value through the second temperature compensation lookup table;

[0020] The second temperature compensation lookup table includes a temperature value, an original grayscale value, and a corresponding VGH value after grayscale reduction. The second temperature compensation lookup table is generated based on the detected temperature value of the display device, the original grayscale value of the current screen, and the VGH value after grayscale reduction by comparing the detected actual grayscale value of the current screen with the difference between the original grayscale value and the grayscale value.

[0021] Optionally, the step of monitoring the actual grayscale value of the current image and comparing it with the original grayscale value, and then reducing the VGH value based on the difference, includes:

[0022] Monitor the actual grayscale value of all pixels in the current row of the current image and compare it with the original grayscale value. Then, reduce the VGH value based on the average of the sum of the differences between all pixels.

[0023] Optionally, the step of detecting the temperature of the display device includes:

[0024] The temperature of the TFT of each pixel in the current row of pixels in the current frame is detected, and the average temperature of all TFTs in each row of pixels is used as the temperature value.

[0025] Optionally, the step of monitoring the actual grayscale value of the current image and comparing it with the original grayscale value, and then reducing the VGH value based on the difference, includes:

[0026] Monitor the data voltage of the current row of pixels and the next row of pixels, determine the changed brightness value based on the change in data voltage, generate a temperature compensation coefficient, obtain the VGH cut-off value based on the temperature compensation coefficient, and cut the VGH value in the first lookup table.

[0027] Optionally, the display device includes a display panel and two gate driving circuits. The two gate driving circuits are respectively disposed on both sides of the display panel. The two gate driving circuits include multiple gate driving units. Two corresponding gate driving units in the two gate driving circuits are connected to both ends of the scan line of the display panel.

[0028] The step of monitoring the actual grayscale value of the current image and comparing it with the original grayscale value, and then reducing the VGH value based on the difference, includes:

[0029] Divide the current screen into a first screen and a second screen along the scan line direction; and

[0030] The actual grayscale values ​​of the first and second frames are monitored and compared with the corresponding original grayscale values. The VGH value corresponding to the first or second frame is reduced based on the average of the two differences.

[0031] The step of using the clipped VGH value to drive the display of the current screen includes:

[0032] Use the VGH value after clipping the corresponding first or second screen to drive the corresponding first and second screen.

[0033] This application also discloses a driving circuit, which is driven using any of the driving methods described above. The driving circuit includes a temperature detection module, a timing control chip, and a gate driving chip. The temperature detection module detects the temperature value of the display device. The timing control chip is connected to the temperature detection module. One end of the gate driving chip is connected to the timing control chip, and the other end is connected to a scan line. The timing control chip includes a trimming module, which trims the VGH value obtained based on a first temperature compensation lookup and outputs the trimmed VGH value to the gate driving chip. The gate driving chip outputs the trimmed VGH to the scan line to control the opening of the scan line.

[0034] This application also discloses a display device, including a driving circuit and a display panel as described above, wherein the driving circuit is used to drive the display panel.

[0035] Compared to the solution of adjusting the VGH value by monitoring the temperature of the chip where the sensor is located, this application finds that the solution is often inaccurate due to the influence of the chip's own temperature, resulting in an adjusted VGH value that is either too high or too low. Therefore, this application directly monitors the actual grayscale value, compares the actual grayscale value with the original grayscale value, and then reduces the original VGH value, i.e., lowers or increases the VGH value again. The reduced VGH value is then used to drive the display of the current image, solving the problem of abnormal display panel illumination and improving the normal shipment rate of display panels. Attached Figure Description

[0036] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0037] Figure 1 This is a flowchart illustrating a driving method according to the first embodiment of this application;

[0038] Figure 2 This is a flowchart illustrating the driving method of the second embodiment of this application;

[0039] Figure 3 This is a flowchart illustrating the driving method of the third embodiment of this application;

[0040] Figure 4 This is a flowchart illustrating the driving method of the fourth embodiment of this application;

[0041] Figure 5 This is a flowchart illustrating the driving method of the fifth embodiment of this application;

[0042] Figure 6 This is a schematic diagram of the drive circuit according to the sixth embodiment of this application;

[0043] Figure 7 This is a schematic diagram of the structure of the display device according to the seventh embodiment of this application.

[0044] Among them, 100 is the driving circuit; 110 is the temperature detection module; 120 is the timing control chip; 121 is the step-cutting module; 130 is the gate driving chip; 200 is the display panel; and 300 is the display device. Detailed Implementation

[0045] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0046] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0047] In addition, terms such as “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer” that indicate orientation or positional relationship are based on the orientation or relative positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0050] like Figure 1 As shown, as a first embodiment of this application, a driving method is disclosed, including the following steps:

[0051] S1: Detects the temperature value displayed on the device;

[0052] S2: Obtain the VGH value corresponding to the current screen using the first temperature compensation lookup table based on the temperature value;

[0053] S3: Monitor the actual grayscale value of the current image and compare it with the original grayscale value, and reduce the VGH value according to the difference;

[0054] S4: Use the VGH value after clipping to drive the display of the current screen;

[0055] The first temperature-compensated lookup table includes temperature values ​​and corresponding VGH values, where the VGH value is the high-level signal value of the scan line of the display device.

[0056] Typically, display panels contain a temperature-compensated lookup table. This table includes temperature values ​​and corresponding VGH values. This application determines the compensated VGH value of the display panel under environmental influences by detecting the temperature of the display device. Then, by monitoring the actual brightness of the current screen, an algorithm obtains the corresponding actual grayscale value. The actual grayscale value is compared with the original grayscale value, and the VGH value in the first temperature lookup table is reduced based on the difference. The VGH value can be adjusted according to the specific difference, i.e., increased or decreased. (Since VGH is the TFT turn-on voltage, the display panel operates at high temperatures...) Environmental aging tests are conducted. To reduce in-plane RC delay and avoid liquid crystal polarization, the VGH voltage needs to be reduced to 30V. This ensures that areas with abnormal brightness can display normally after receiving the VGH value after clipping. By detecting the image that needs compensation, an algorithm is used to monitor grayscale levels that are higher than the specification. Then, positive or negative clipping of the VGH value is performed. This achieves the effect of reducing temperature without affecting the overall product quality, avoiding brightness abnormalities caused by inaccurate VGH value adjustment, and further preventing abnormal liquid crystal driving voltage caused by excessively high or low VGH values. In severe cases, this can lead to liquid crystal polarization, affecting the shipment of display panels.

[0057] Furthermore, as a second embodiment of this application, in order to make the entire display screen more uniform, the adjustment of the VGH value can be adjusted in sections, further refining step S3, such as... Figure 2 As shown, the detailed steps of step S3 are as follows:

[0058] S231: Divide the current screen into a first screen and a second screen along the data cable direction; and

[0059] S232: Monitor the actual grayscale values ​​of the first and second images respectively and compare them with the corresponding original grayscale values. Based on the corresponding difference, reduce the VGH value corresponding to the current temperature value to obtain the reduced VGH value corresponding to the first image and the reduced VGH value corresponding to the second image.

[0060] Correspondingly, step S4 includes:

[0061] S241: Use the VGH value after level reduction of the first screen to drive the display of the corresponding first screen, and use the VGH value after level reduction of the second screen to drive the display of the corresponding second screen.

[0062] The current image is divided into at least two sub-images, namely, a first image and a second image. By monitoring the first and second images separately, the VGH is corrected or reduced in different regions. This avoids reducing the brightness of the entire image, which could result in excessive brightness differences in some areas after reduction. It should be noted that the current image can be divided into more sub-images. Each sub-image can be a region with one scan line or multiple scan lines. The specific method can be verified and tested again after adjustment, and further adjustments can be made based on the verification results. Generally, the number of scan lines corresponding to the first and second images are different, but they can also be different, depending on the specific image. Under limited conditions, if it is possible to detect brightness anomalies in each pixel, reduction can also be performed on the VGH value of a single pixel. For example, monitor the actual grayscale value of all pixels in the current row of pixels in the current image and compare it with the original grayscale value. Reduce the VGH value based on the difference between all pixels.

[0063] In step S3, the actual grayscale value corresponding to all pixels in the current row of the current image can also be monitored and compared with the original grayscale value. The VGH value is then reduced based on the average of the sum of the differences between all pixels.

[0064] In step S1, detecting the temperature of the display device can be achieved by detecting the temperature of the TFT of each pixel in the current row of pixels in the current frame, obtaining the temperature value of each TFT by setting a temperature sensor for each TFT, or by fitting the temperature of the sensor to the position of the corresponding TFT to obtain the temperature value of each TFT, or by measuring the temperature value of the TFT at different positions using an infrared temperature sensor. Typically, after obtaining the temperature value of the TFT of each pixel, the average temperature of all TFTs in each row of pixels is usually used as the temperature value. Of course, the average temperature of all TFTs in each sub-frame can also be used as the temperature value, and the setting can be selected according to the actual situation of the screen.

[0065] By detecting the temperature of the TFT of each pixel, the temperature value can be made closer to the actual required temperature value. This avoids the situation where directly measuring the temperature of the power driver chip causes the temperature sensor on the power driver chip to rise, leading to an overall increase in the temperature of the control board. The temperature compensation circuit detects a higher temperature than the actual temperature, causing temperature compensation failure. This results in an inaccurate VGH value, which affects the driving voltage of the pixels, causing asymmetry in the driving voltage, forming an internal bias electric field, affecting the deflection of the liquid crystal, and causing liquid crystal polarization problems. When the grayscale voltage is high, if the compensation value is too large, it will further increase the brightness difference, resulting in an excessively high pixel charging voltage, causing the corresponding TFT to break down, leading to excessive metal line current, excessive temperature, and damage. In severe cases, it may even cause the polarizer to burn out.

[0066] like Figure 3 As shown, in the third embodiment of this application, unlike the embodiments described above, step S3 includes:

[0067] S331: Monitor the data voltage of the current row of pixels and the next row of pixels, determine the changed brightness value based on the change in data voltage, generate a temperature compensation coefficient, obtain the VGH cut-off value based on the temperature compensation coefficient, and cut the VGH value in the first lookup table.

[0068] The data voltage of pixels in different rows is different. Under normal screen conditions, the voltage jumps from 0 to 255. For 2160 rows, the number of jumps is 2160. After the temperature compensation circuit of this application is turned on, the screen is divided into multiple sub-screens. At the same time, the timing control chip detects the grayscale change of 0-255 in each screen. According to the change of data voltage between the upper and lower rows, the compensation of VGH is adjusted for each sub-screen, that is, the level reduction operation is performed to realize the change of temperature compensation coefficient. The temperature coefficient is determined by the change between different grayscale values, and then the level reduction value is controlled.

[0069] It should be noted that the reduction or compensation for changing from 0 grayscale to 255 grayscale and changing from 255 grayscale to 0 grayscale are different. These two compensations are also different in low temperature and high temperature environments. At high temperature, VGH should be reduced, i.e., positive reduction, while at low temperature, VGH should be increased, i.e., negative reduction.

[0070] like Figure 4 As shown, the fourth embodiment of this application is a further refinement of the first embodiment described above, wherein step S3 further includes:

[0071] S431: Obtain the original grayscale value of the current image; and

[0072] S432: Obtain the VGH value after grayscale reduction based on the original grayscale value using the second temperature compensation lookup table;

[0073] The second temperature compensation lookup table includes a temperature value, an original grayscale value, and a corresponding VGH value after grayscale reduction. The second temperature compensation lookup table is generated based on the detected temperature value of the display device, the original grayscale value of the current screen, and the VGH value after grayscale reduction by comparing the detected actual grayscale value of the current screen with the difference between the original grayscale value and the grayscale value.

[0074] The VGH value after grayscale reduction is obtained by comparing the original grayscale value with the actual grayscale value. This VGH value is then used to drive the display device. Considering that the calculation process will still increase the response time of signal transmission, a lookup table can be established after obtaining the VGH value, namely the second temperature compensation lookup table, which is the previous temperature value and the original grayscale value. After detecting the temperature value or the original grayscale value, the VGH value after grayscale reduction is obtained directly by looking up the second temperature compensation lookup table with the temperature value and the original grayscale value. This VGH value is then used to drive the display device, reducing the need for manual detection of changes in the temperature compensation circuit and improving work efficiency.

[0075] As a fifth embodiment of this application, the display device includes a display panel and two gate driving circuits. The two gate driving circuits are respectively disposed on both sides of the display panel. Each gate driving circuit includes multiple gate driving units, and two corresponding gate driving units in the two gate driving circuits are connected to both ends of a scan line on the display panel. Figure 5 As shown, step S3 includes:

[0076] S531: Divide the current screen into a first screen and a second screen along the scan line direction; and

[0077] S532: Monitor the actual grayscale values ​​of the first and second images respectively and compare them with the corresponding original grayscale values. Based on the average of the two differences, reduce the VGH value of the first or second image.

[0078] Step S4 includes:

[0079] S541: Use the VGH value after clipping the corresponding first or second screen to drive the corresponding first or second screen.

[0080] This embodiment mainly targets a dual-side driven display device. Two gate driving circuits are respectively located on both sides of the display panel. The high-level signal value of the scan line, i.e., VGH, is output from the gate driving unit in the two gate driving circuits. The first and second frames along the scan line direction correspond to the driving signals of the two gate driving circuits, respectively. The same scan line receives the driving signals from the gate driving units at both ends. Therefore, the high-level signal value of the driving signal output by the two gate driving circuits, i.e., VGH, can use the same clipped VGH value. The clipped VGH value is mainly obtained by monitoring the actual grayscale value of the first and second frames and comparing it with the corresponding original grayscale value. The VGH value corresponding to the first or second frame is clipped based on the average of the two differences. Of course, the first and second frames can also be driven with different clipped VGH values, which can be calculated according to the specific changes in actual brightness and target brightness.

[0081] It should be noted that the above-mentioned clipping of the high-level signal VGH of the scan line signal also applies to the clipping of the low-level signal VGL of the scan line signal. The clipping can be adjusted or modified according to the changes in the ambient temperature, referring to the corresponding temperature compensation coefficient of VGH, i.e., positive clipping and negative clipping.

[0082] like Figure 6 As shown, as the sixth embodiment of this application, this embodiment is a driving circuit 100 corresponding to the above-described driving method. The driving circuit 100 disclosed in this application is driven using the driving method described in any of the above embodiments. The driving circuit 100 includes a temperature detection module 110, a timing control chip 120, and a gate driving chip 130. The temperature detection module 110 detects the temperature value of the display device. The timing control chip 120 is connected to the temperature detection module 110. One end of the gate driving chip 130 is connected to the timing control chip 120, and the other end is connected to the scan line. The timing control chip 120 includes a trimming module 121. The trimming module 121 trims the VGH value obtained according to the first temperature compensation lookup and outputs the trimmed VGH value to the gate driving chip 130. The gate driving chip 130 outputs the trimmed VGH to the scan line to control the opening of the scan line.

[0083] Unlike existing temperature compensation circuits, this application employs a grayscale reduction module 121 within the timing control chip 120 to monitor the actual grayscale value of the current image and compare it with the original grayscale value. Based on the difference, the VGH value is reduced, and the reduced VGH value is used to drive the display of the current image. This avoids the inaccuracy of temperature values ​​detected by existing temperature compensation circuits, which leads to inaccurate VGH values ​​and abnormal brightness caused by inaccurate adjustments. Furthermore, it avoids abnormal liquid crystal driving voltage caused by excessively large or small VGH values, which in severe cases can lead to liquid crystal polarization, affecting the shipment of display panels and causing cost losses.

[0084] like Figure 7 As shown, this application also discloses a display device 300, which includes a driving circuit 100 and a display panel 200 as described above. The driving circuit 100 can use the driving method described in any of the above embodiments to drive the display panel 200.

[0085] It should be noted that the limitations on each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be considered to fall within the scope of protection of this application.

[0086] It should be noted that the inventive concept of this application can form many embodiments, but due to the limited space of the application documents, they cannot all be listed. Therefore, without conflict, the embodiments described above or the technical features can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effect will be enhanced.

[0087] The technical solution of this application can be widely used in various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, and MVA (Multi-Domain Vertical Alignment) display panels. Of course, it can also be used in other types of display panels, such as OLED (Organic Light-Emitting Diode) display panels, all of which are applicable to the above solution.

[0088] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A driving method characterized by comprising: The method comprises the steps of: detecting a temperature value of a display device; obtaining a VGH value corresponding to a current picture according to the temperature value through a first temperature compensation lookup table; monitoring actual gray scale values of the current picture and comparing them with original gray scale values, and cutting the VGH value according to a difference value; using the cut VGH value to drive the display of the current picture; wherein the first temperature compensation lookup table comprises temperature values and corresponding VGH values, and the VGH values are high level signal values of scan lines of the display device; the step of monitoring actual gray scale values of the current picture and comparing them with original gray scale values, and cutting the VGH value according to a difference value comprises: dividing the current picture into a first picture and a second picture along a data line direction; and respectively monitoring actual gray scale values of the first picture and the second picture and comparing them with corresponding original gray scale values, and cutting the VGH value corresponding to the current temperature value according to corresponding difference values to obtain a cut VGH value corresponding to the first picture and a cut VGH value corresponding to the second picture; the step of using the cut VGH value to drive the display of the current picture comprises: using the cut VGH value corresponding to the first picture to drive the display of the corresponding first picture, and using the cut VGH value corresponding to the second picture to drive the display of the corresponding second picture.

2. The driving method of claim 1, wherein, The number of scan lines corresponding to the first picture and the second picture is different.

3. A driving method, characterized by, The method comprises the steps of: detecting a temperature value of a display device; obtaining a VGH value corresponding to a current picture according to the temperature value through a first temperature compensation lookup table; monitoring actual gray scale values of the current picture and comparing them with original gray scale values, and cutting the VGH value according to a difference value; using the cut VGH value to drive the display of the current picture; wherein the first temperature compensation lookup table comprises temperature values and corresponding VGH values, and the VGH values are high level signal values of scan lines of the display device; the display device comprises a display panel and two gate drive circuits, the two gate drive circuits are respectively arranged on two sides of the display panel, the two gate drive circuits comprise a plurality of gate drive units, and corresponding two gate drive units in the two gate drive circuits are connected to two ends of a scan line of the display panel; the step of monitoring actual gray scale values of the current picture and comparing them with original gray scale values, and cutting the VGH value according to a difference value comprises: dividing the current picture into a first picture and a second picture along a scan line direction; and respectively monitoring actual gray scale values of the first picture and the second picture and comparing them with corresponding original gray scale values, and cutting the VGH value corresponding to the first picture or the second picture according to an average value of two difference values; the step of using the cut VGH value to drive the display of the current picture comprises: using the cut VGH value corresponding to the first picture or the second picture to drive the corresponding first picture and the second picture.

4. A drive circuit driven using the drive method according to any one of claims 1 to 3, characterized by The driving circuit comprises: a temperature detection module for detecting a temperature value of a display device; a timing control chip connected with the temperature detection module; and a gate drive chip connected with one end of the timing control chip and connected with a scan line at the other end. The timing control chip comprises a chopping module, the chopping module obtains a VGH value according to a first temperature compensation search to perform chopping, and outputs the chopped VGH value to a gate drive chip, and the gate drive chip outputs the chopped VGH to the scanning line to control opening of the scanning line.

5. A display device comprising the driving circuit according to claim 4 and a display panel, wherein the driving circuit is used to drive the display panel.

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