Driving circuit, driving method, and display device

Abstract

The application discloses a driving circuit for driving a display panel, which comprises a leakage current generating module and a gate low-voltage output module. The leakage current generating module is connected with any one data line in the display panel, generates leakage current and outputs the leakage current to the connected data line. The gate low-voltage output module is connected with the leakage current generating module. The gate low-voltage output module determines the voltage value of the gate low-voltage output to the data line of the display panel based on the current value of the leakage current generated by the leakage current generating module, so as to generate a corresponding gate low-voltage driving signal output to the data line of the display panel, and adjust the current value of the leakage current on the data line in the display panel to the minimum value. The application adjusts the voltage value of the gate low-voltage output to the gate line of the display panel, so that the current value of the leakage current on the data line reaches the minimum value, improves the crosstalk problem caused by the leakage current and improves the display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a driving circuit, a driving method and a display device. BACKGROUND

[0002] With the increasing size of liquid crystal display panels (LCD), the related technologies of LCD panels have been widely applied, especially in the high-end display field, important progress has been made in the technology of LCD panels. TFT liquid crystal screen (Thin Film Transistor Liquid Crystal Display) is a special type of LCD display screen. Unlike traditional LCD, TFT liquid crystal screen uses thin film transistor to control the brightness and color of each pixel. This means that each pixel has an independent transistor that can more accurately control the transmission of light, thereby achieving higher resolution and better image quality.

[0003] In recent years, people have higher and higher requirements for the quality of display screens, and the market share of large-size high-resolution displays has gradually increased. Therefore, 8K ultra-high-definition displays have emerged. Compared with 4K displays, 8K displays have a qualitative improvement in image quality, and can also be combined with 5G to bring more sensory experiences. However, high-specification products are also accompanied by more display problems, and vertical crosstalk is one of them. The phenomenon is that the display of a certain area in the vertical direction is affected by another area, resulting in distorted images. The vertical crosstalk is caused by the leakage current Ioff of the thin film transistor (TFT) when it is turned off, which causes the pixel voltage to shift, affecting the display effect. SUMMARY

[0004] The purpose of the present application is to provide a driving circuit, a driving method and a display device that can improve crosstalk and improve display effect.

[0005] The present application discloses a driving circuit for driving a display panel, the driving circuit comprising a leakage current generating module and a gate low voltage output module, the leakage current generating module being connected with any one data line in the display panel, generating a leakage current and outputting to the connected data line; the gate low voltage output module is connected with the leakage current generating module, and generates a gate low voltage based on the current value of the leakage current generated by the leakage current generating module; wherein the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generating module, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and adjust the current value of the leakage current on the data line in the display panel to a minimum value.

[0006] Optionally, the leakage current generating module comprises a first thin film transistor; the gate low voltage output module comprises a filtering unit, a current amplification unit, a resistance voltage division unit and a power chip; the control end of the first thin film transistor is connected with the power chip, the input end is connected with any data line in the display panel, and the output end is connected with the input end of the filtering unit; the output end of the filtering unit is connected with the input end of the current amplification unit, and the filtered leakage current is output to the current amplification unit; the output end of the current amplification unit is connected with the input end of the resistance voltage division unit, and the amplified leakage current is output to the resistance voltage division unit; the output end of the resistance voltage division unit is connected with the power chip, and the voltage after voltage division is output to the power chip; wherein the first thin film transistor is formed in the same process as the thin film transistor in the pixel, has the same size and model, and generates the leakage current with the same value; and the power chip generates the corresponding gate low voltage driving signal based on the voltage after voltage division and outputs the signal to the gate line of the display panel, so that the leakage current value on the data line in the display panel is minimized.

[0007] Optionally, the leakage current generating module comprises a first thin film transistor and a second thin film transistor, and the gate low voltage output module comprises a leakage current addition unit, a filtering unit, a current amplification unit, a resistance voltage division unit and a power chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are a first data line and an n-th data line; the control end of the first thin film transistor and the control end of the second thin film transistor are connected with the power chip respectively, the input end of the first thin film transistor is connected with the first data line in the display panel, and the input end of the second thin film transistor is connected with the n-th data line in the display panel; the output end of the first thin film transistor and the output end of the second thin film transistor are connected with the leakage current addition unit respectively, the leakage current collected from the first thin film transistor and the second thin film transistor is calculated by the leakage current addition unit; the output end of the leakage current addition unit is connected with the input end of the filtering unit; the output end of the filtering unit is connected with the input end of the current amplification unit, and the filtered leakage current is output to the current amplification unit; the output end of the current amplification unit is connected with the input end of the resistance voltage division unit, and the amplified leakage current is output to the resistance voltage division unit; the output end of the resistance voltage division unit is connected with the power chip, and the voltage after voltage division is output to the power chip; wherein the first thin film transistor and the second thin film transistor are formed in the same process as the thin film transistor in the pixel, have the same size and model, and generate the leakage current with the same value; and the power chip generates the corresponding gate low voltage driving signal based on the voltage after voltage division and outputs the signal to the gate line of the display panel, so that the leakage current value on the data line in the display panel is minimized.

[0008] Optionally, the leakage current generating module comprises a pixel unit, the gate low voltage output module comprises a voltage storage unit, a switch control unit and a power supply chip, an input end of the switch control unit is connected with the pixel unit through a data line, and the switch control unit controls the leakage current output by the pixel unit to the data line to be input to the voltage storage unit, and the power supply chip generates a corresponding gate low voltage driving signal according to a voltage value stored in the voltage storage unit and outputs the gate low voltage driving signal to a gate line of the display panel, so that the leakage current value on the data line in the display panel is minimized.

[0009] Optionally, the driving circuit further comprises a temperature detection module and a brightness detection module, the temperature detection module and the brightness detection module are connected with the current amplification unit respectively, the temperature detection module is used for detecting a temperature value of the display panel in real time, and the amplification multiple of the current amplification unit to the leakage current is controlled through the temperature value; the brightness detection module is used for detecting a brightness value of the display panel in real time, and the amplification multiple of the current amplification unit to the leakage current is controlled through the brightness value.

[0010] Optionally, the leakage current generating module comprises a first thin film transistor and a second thin film transistor, the gate low voltage output module comprises a leakage current input control unit, a filter unit, a current amplification unit, a resistance voltage division unit and a power supply chip; along a scanning direction of a scanning line of the display panel, two data lines close to both sides of the display panel are a first data line and an n th data line respectively; the leakage current input control unit comprises a timing control circuit, a first switch and a second switch, the timing control circuit outputs a switch control signal to control conduction of the first switch and the second switch; the first switch is turned on at a low level and turned off at a high level, and the second switch is turned off at a low level and turned on at a high level; a control end of the first thin film transistor is connected with the power supply chip through the first switch, a control end of the second thin film transistor is connected with the power supply chip through the first switch, an input end of the first thin film transistor is connected with the first data line in the display panel, and an input end of the second thin film transistor is connected with the n th data line in the display panel; an output end of the first thin film transistor and an output end of the second thin film transistor are connected with an input end of the filter unit respectively; an output end of the filter unit is connected with an input end of the current amplification unit, and a filtered leakage current is output to the current amplification unit; an output end of the current amplification unit is connected with an input end of the resistance voltage division unit, and an amplified leakage current is output to the resistance voltage division unit, and an output end of the resistance voltage division unit is connected with the power supply chip, and a voltage after voltage division is output to the power supply chip; wherein the first thin film transistor and the second thin film transistor are formed in the same process as thin film transistors in the pixel, have the same type and size, and have the same leakage current value, the power supply chip generates a corresponding gate low voltage driving signal based on the filtered, amplified and voltage-divided voltage of the leakage current generated by different thin film transistors, and outputs the corresponding gate low voltage driving signal to a gate line of the display panel, so that the leakage current value of the data line in the display panel at different times is minimized.

[0011] Optionally, the driving circuit further comprises a storage module, the storage module stores a first lookup table formed based on a relationship curve between the leakage current value and the gate low voltage, and the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generating module and the first lookup table.

[0012] The application further discloses a driving method for the driving circuit and the display panel.

[0013] The driving method comprises:

[0014] The current value of the leakage current is determined to determine a voltage value of a gate low voltage output to a gate line of the display panel to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and the current value of the leakage current of the data line in the display panel is adjusted to a minimum value.

[0015] Optionally, the leakage current generating module comprises a pixel unit, and the gate low voltage output module comprises a voltage storage unit, a switch control unit and a power supply chip, an input end of the switch control unit is connected with the pixel unit through a data line.

[0016] The step of obtaining the current value of the leakage current of the data line in the display panel comprises:

[0017] In a first time period, an unadjusted gate low voltage is output to a gate line of the display panel, a gray scale data signal corresponding to a white picture is output to a data line, and the switch control unit is controlled to be turned off.

[0018] In a second time period, an unadjusted gate high voltage is output to the gate line of the display panel, a zero gray scale data signal is output to the data line, and the switch control unit is controlled to be turned on to obtain the leakage current of the data line in the display panel.

[0019] The step of determining the voltage value of the gate low voltage output to the gate line of the display panel according to the detected current value of the leakage current to generate a corresponding gate low voltage driving signal output to the gate line of the display panel to adjust the current value of the leakage current of the data line in the display panel to a minimum value comprises:

[0020] In the second time period, the voltage storage unit receives the leakage current of the data line and converts the leakage current into a corresponding voltage value.

[0021] After a preset time, the voltage value of the gate low voltage output to the gate line of the display panel is determined based on the voltage value of the voltage storage unit to generate a corresponding gate low voltage driving signal output to the gate line of the display panel to adjust the current value of the leakage current of the data line in the display panel to a minimum value.

[0022] The application further discloses a display device comprising a display panel and the driving circuit as any one of the above, wherein the driving circuit drives the display panel by using the driving method as any one of the above.

[0023] Compared with the solution of adjusting the data voltage to improve the crosstalk problem, the application sets a driving circuit, obtains the current value of the leakage current on the data line in the display panel, determines the voltage value of the gate low voltage output to the gate line of the display panel according to the current value of the leakage current, generates the corresponding gate low voltage driving signal output to the gate line of the display panel, adjusts the current value of the leakage current on the data line in the display panel to the minimum value, reduces the leakage current value when the display panel displays, improves the crosstalk problem, and improves the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings included to provide a further understanding of the embodiments of the application and constitute a part of the specification, illustrate the embodiments of the application, and together with the text description, explain the principles of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0025] Figure 1 is a structural schematic diagram of a display panel and a driving circuit in the first embodiment of the application;

[0026] Figure 2 is a structural schematic diagram of a display panel and a driving circuit in the second embodiment of the application;

[0027] Figure 3 is a structural schematic diagram of a display panel and a driving circuit in the third embodiment of the application;

[0028] Figure 4 is a structural schematic diagram of a display panel and a driving circuit in the fourth embodiment of the application;

[0029] Figure 5 is a structural schematic diagram of another display panel and a driving circuit in the fourth embodiment of the application;

[0030] Figure 6 is a structural schematic diagram of a display panel and a driving circuit in the fifth embodiment of the application;

[0031] Figure 7 is a relationship curve between the gate low voltage and the leakage current in the fifth embodiment of the application;

[0032] Figure 8 is a structural schematic diagram of a display panel and a driving circuit in the sixth embodiment of the application;

[0033] Figure 9 is a structural schematic diagram of another display panel and a driving circuit in the sixth embodiment of the application;

[0034] Figure 10 is a driving method flowchart of the seventh embodiment of the present application;

[0035] Figure 11 is a driving method flowchart of the eighth embodiment of the present application;

[0036] Figure 12 is a structural diagram of the display device of the ninth embodiment of the present application.

[0037] wherein, 100, driving circuit; 110, leakage current generating module; 111, first thin film transistor; 112, second thin film transistor; 113, pixel unit; 120, gate low voltage output module; 121, filter unit; 122, current amplification unit; 123, resistance voltage division unit; 124, power supply chip; 125, leakage current addition unit; 126, leakage current input control unit; 1261, timing control circuit; 127, voltage storage unit; 128, switch control unit; 130, temperature detection module; 140, brightness detection module; 150, storage module; 160, control board; 170, flip chip; 200, display panel; 210, display area; 220, non-display area; 300, display device;

[0038] first data line-S1; nth data line-Sn; gate line-G1~Gn; gate low voltage-VGL; gate high voltage-VGH; first switch-Q1; second switch-Q2; capacitor-C; first control switch-T1. DETAILED DESCRIPTION

[0039] It should be understood that the terms used herein, the specific structures and functional details disclosed, are only for the purpose of describing specific embodiments, and are representative, but the present application can be embodied in many alternative forms, and should not be interpreted as being limited to the embodiments set forth herein.

[0040] The present application will be described in detail below with reference to the accompanying drawings and optional embodiments.

[0041] Reference Figure 1As shown, as the first embodiment of the present application, a driving circuit 100 for driving a display panel 200 is disclosed, the driving circuit 100 comprises a leakage current generating module 110 and a gate low voltage output module 120, the leakage current generating module 110 is connected with any one data line in the display panel 200, generates leakage current and outputs to the connected data line; the gate low voltage output module 120 is connected with the leakage current generating module 110, generates a gate low voltage based on the current value of the leakage current generated by the leakage current generating module 110; wherein the gate low voltage output module 120 determines the voltage value of the gate low voltage output to the gate line of the display panel 200 based on the current value of the leakage current generated by the leakage current generating module 110, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel 200, and adjust the current value of the leakage current on the data line in the display panel 200 to a minimum value.

[0042] Considering that the data line leakage current will cause unexpected flow of charges between adjacent pixels, causing vertical brightness unevenness (i.e. vertical crosstalk), the present application mainly adjusts the gate low voltage VGL dynamically, directly suppresses the data line leakage, and eliminates the crosstalk inducement from the source, specifically, by connecting the data line, the leakage current value on the data line is obtained or detected, the voltage value of the gate low voltage output to the gate line of the display panel 200 is determined based on the current value of the leakage current generated by the leakage current generating module 110, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel 200, and adjust the current value of the leakage current on the data line in the display panel 200 to a minimum value, minimizing the leakage current can reduce the invalid power loss, improve the crosstalk problem, and improve the display effect; in addition, the present application detects the leakage current in real time, and the environment changes, such as temperature and illumination intensity, will have an impact on the characteristic curve of the thin film transistor (TFT), that is, the best gate low voltage VGL is different under different environments, so the gate low voltage VGL is adjusted synchronously when the environment changes, and the leakage current corresponding to the selected gate low voltage VGL is the minimum value, then the gate low voltage VGL at this time is the best gate low voltage VGL.

[0043] Reference Figure 2As shown, as the second embodiment of the present application, it is further refined and improved to the first embodiment, specifically, the leakage current generating module 110 includes a first thin film transistor 111; the gate low voltage output module 120 includes a filter unit 121, a current amplification unit 122, a resistance voltage division unit 123 and a power chip 124; the control end of the first thin film transistor 111 is connected with the power chip 124, the input end is connected with any data line in the display panel 200, and the output end is connected with the input end of the filter unit 121; the output end of the filter unit 121 is connected with the input end of the current amplification unit 122, and the filtered leakage current is output to the current amplification unit 122; the output end of the current amplification unit 122 is connected with the input end of the resistance voltage division unit 123, and the amplified leakage current is output to the resistance voltage division unit 123; the output end of the resistance voltage division unit 123 is connected with the power chip 124, and the divided voltage is output to the power chip 124; wherein the first thin film transistor 111 is formed in the same process with the thin film transistor in the pixel, and the model size is the same, and the generated leakage current value is equal, the power chip 124 generates the corresponding gate low voltage driving signal based on the divided voltage and outputs to the gate line of the display panel 200, so that the leakage current value on the data line in the display panel 200 is minimized.

[0044] In the embodiment, during the manufacturing of the display panel 200, the thin film transistor in the display panel 200 and the first thin film transistor 111 are formed by the same manufacturing process. The leakage current of the first thin film transistor 111 represents the leakage current of the thin film transistor in the display panel 200. The first thin film transistor 111 is arranged in the non-display area 220 of the display panel 200, which is equivalent to pulling out the thin film transistor in the display panel 200 to detect the leakage current of the thin film transistor. The first thin film transistor 111 is arranged at the edge of the non-display area 220 of the display panel 200. The control terminal of the first thin film transistor 111 is connected to the power chip 124 to receive the gate low voltage driving signal output by the power chip 124. The input terminal of the first thin film transistor 111 is connected to the data line. The current output by the output terminal of the first thin film transistor 111 is the leakage current Ioff. The output leakage current is input to the control board 160 through the chip on flex (COF). The filter unit 121, the current amplification unit 122, the resistance voltage division unit 123 and the power chip 124 are arranged on the control board 160. After the leakage current Ioff is input to the control board 160, the leakage current Ioff is filtered to filter out high-frequency noise. Since the leakage current Ioff of a single TFT is very small, the leakage current Ioff needs to be amplified before it can be detected. Then, the resistance voltage division unit 123 feeds back the voltage divided by the resistance to the power chip 124. The greater the voltage, the greater the leakage current. The power chip 124 adjusts the voltage value of the gate low voltage VGL based on the detected feedback voltage to minimize the leakage current.

[0045] Reference Figure 3As shown, as the third embodiment of the present application, it is further refined and improved to the first embodiment, and different from the second embodiment, the leakage current generating module 110 includes a first thin film transistor 111 and a second thin film transistor 112, the gate low voltage output module 120 includes a leakage current adding unit 125, a filter unit 121, a current amplification unit 122, a resistance voltage dividing unit 123 and a power chip 124; along the scanning direction of the scanning line of the display panel 200, the two data lines close to the two sides of the display panel 200 are the first data line and the nth data line respectively; the control end of the first thin film transistor 111 and the control end of the second thin film transistor 112 are connected with the power chip 124 respectively, the input end of the first thin film transistor 111 is connected with the first data line in the display panel 200, and the input end of the second thin film transistor 112 is connected with the nth data line in the display panel 200; the output end of the first thin film transistor 111 and the output end of the second thin film transistor 112 are connected with the leakage current adding unit 125 respectively, the leakage current adding unit 125 performs addition calculation on the leakage current collected from the first thin film transistor 111 and the second thin film transistor; the output end of the leakage current adding unit 125 is connected with the input end of the filter unit 121; the output end of the filter unit 121 is connected with the input end of the current amplification unit 122, and the filtered leakage current is output to the current amplification unit 122; the output end of the current amplification unit 122 is connected with the input end of the resistance voltage dividing unit 123, and the amplified leakage current is output to the resistance voltage dividing unit 123, the output end of the resistance voltage dividing unit 123 is connected with the power chip 124, and the divided voltage is output to the power chip 124; wherein, the first thin film transistor 111 and the second thin film transistor 112 are formed in the same process with the thin film transistor in the pixel, and have the same model size, and the generated leakage current values are equal, the power chip 124 generates the corresponding gate low voltage driving signal based on the divided voltage and outputs to the gate line of the display panel 200, so as to minimize the leakage current value on the data line in the display panel 200.

[0046] In the embodiment, considering that the whole OC can be measured by detecting two ends, when the display panel 200 is very large, the environments of the left end and the right end can be different, so the gate low voltage VGL can take an intermediate value to make the sum of the drain currents of the left end and the right end minimum, therefore, a thin film transistor TFT is added at each end of the display panel 200, i.e., a first thin film transistor 111 and a second thin film transistor 112, the control ends of the two transistors are connected to the power supply chip 124 and receive the VGL output by the power supply chip 124, the input ends are respectively connected to the data lines at the two ends, the current output at the other end is the drain current Ioff, and the output drain current is input to the control panel 160 through the COF. The TFTs at the two ends of the display panel 200 are added on the control panel 160, the purpose of which is to avoid the case that the two ends of the panel are heated and illuminated unevenly, and to detect the drain current of the whole panel by addition. The drain current Ioff is filtered to filter out high-frequency noise; since the drain current Ioff of a single TFT is very small, it needs to be amplified before it can be detected; then, the voltage divided by the resistance is fed back to the power supply chip 124 (POWER IC), the greater the voltage, the greater the drain current, and the power IC adjusts the voltage value of the gate low voltage VGL to make the drain current minimum after detecting the feedback voltage.

[0047] Reference Figure 4 As shown in FIG. 4, as the fourth embodiment of the present application, which is further refined and improved on the basis of the first embodiment, different from the third embodiment, the reference 4 Figure 5As shown, the leakage current generating module 110 includes a first thin film transistor 111 and a second thin film transistor 112, the gate low voltage output module 120 includes a leakage current input control unit 126, a filter unit 121, a current amplification unit 122, a resistance voltage division unit 123 and a power supply chip 124; along the scanning direction of the scanning line of the display panel 200, the two data lines close to the two sides of the display panel 200 are a first data line and an n-th data line respectively; the leakage current input control unit 126 includes a timing control circuit 1261, a first switch and a second switch, the timing control circuit 1261 outputs a switch control signal to control the conduction of the first switch and the second switch; the first switch is turned on at low level and turned off at high level, and the second switch is turned off at low level and turned on at high level; the control end of the first thin film transistor 111 is connected with the power supply chip 124 through the first switch, the control end of the second thin film transistor 112 is connected with the power supply chip 124 through the first switch, the input end of the first thin film transistor 111 is connected with the first data line in the display panel 200, and the input end of the second thin film transistor 112 is connected with the n-th data line in the display panel 200; the output end of the first thin film transistor 111 and the output end of the second thin film transistor 112 are connected with the input end of the filter unit 121 respectively; the output end of the filter unit 121 is connected with the input end of the current amplification unit 122, and outputs the filtered leakage current to the current amplification unit 122; the output end of the current amplification unit 122 is connected with the input end of the resistance voltage division unit 123, and outputs the amplified leakage current to the resistance voltage division unit 123, and the output end of the resistance voltage division unit 123 is connected with the power supply chip 124, and outputs the voltage after voltage division to the power supply chip 124.

[0048] The first thin film transistor 111 and the second thin film transistor 112 are formed in the same process as the thin film transistor in the pixel, and have the same model size and equal leakage current value, the power supply chip 124 generates corresponding gate low voltage driving signals based on the filtered, amplified and divided voltage of the leakage current generated by different thin film transistors, and outputs the signals to the gate line of the display panel 200, so that the leakage current value of the data line in the display panel 200 is minimized at different times.

[0049] In this embodiment, two thin-film transistors are added to both ends of the display panel 200. The two thin-film transistors are independently controlled and generate VGL values ​​corresponding to the minimum leakage current at different time periods. During the first time period, the timing control circuit 1261 outputs a switch control signal to control the first switch Q1 to turn on and the second switch Q2 to turn off. The leakage current on the first data line on the left is filtered by the filter unit 121 and then output to the current amplification unit 122. The current amplification unit 122 amplifies the filtered leakage current and outputs it to the resistor voltage divider unit 123. The output terminal of the resistor voltage divider unit 123 is connected to the power chip 124 and outputs the divided voltage to the power chip 124. The power chip 124 generates a corresponding gate low voltage drive signal based on the filtered, amplified, and divided voltage of the leakage current generated by the different thin-film transistors and outputs it to the display panel. On the gate line of the display panel 200, the leakage current value of the data lines within the display panel 200 is minimized. During the second time period, the timing control circuit 1261 outputs a switch control signal to control the first switch to turn off and the second switch to turn on. The leakage current on the nth data line on the right side is filtered by the filter unit 121 and output to the current amplification unit 122. The current amplification unit 122 amplifies the filtered leakage current and outputs it to the resistor voltage divider unit 123. The output terminal of the resistor voltage divider unit 123 is connected to the power chip 124 and outputs the divided voltage to the power chip 124. The power chip 124 generates a corresponding gate low voltage drive signal based on the voltage after filtering, amplifying, and dividing the leakage current generated by different thin-film transistors and outputs it to the gate line of the display panel 200, so as to minimize the leakage current value of the data lines within the display panel 200.

[0050] refer to Figure 6 As shown, the fifth embodiment of this application is a further refinement and improvement of the second to fourth embodiments described above. (Refer to...) Figure 6 and Figure 7 As shown, the driving circuit 100 further includes a storage module 150, which stores a curve relating leakage current and gate low voltage. Figure 7 In the table, the horizontal axis represents the gate low voltage input to the gate line, and the vertical axis represents the corresponding leakage current value Ioff. The gate low voltage output module 120 determines the gate low voltage value output to the gate line of the display panel 200 based on the leakage current value generated by the leakage current generation module 110 and the first lookup table. After obtaining the leakage current value, the optimal gate low voltage VGL can be found by looking up the table. The optimal gate low voltage VGL is found and the corresponding gate low voltage drive signal is generated and output to the gate line in the display panel 200, thereby minimizing the leakage current on the data line.

[0051] In addition, the driving circuit 100 further comprises a temperature detection module 130 and a brightness detection module 140, which are connected with the current amplification unit 122 respectively. The temperature detection module 130 is used to detect the temperature value of the display panel 200 in real time, and the amplification multiple of the current amplification unit 122 to the leakage current is controlled by the temperature value. The brightness detection module 140 is used to detect the brightness value of the display panel 200 in real time, and the amplification multiple of the current amplification unit 122 to the leakage current is controlled by the brightness value. Considering that both temperature and illumination will affect the leakage current, although the leakage current obtained in this embodiment is real-time, which means that the leakage current value has been affected by temperature or illumination and other factors, considering that sometimes the temperature or illumination is strong, and the current value of the leakage current is relatively large, therefore, the amplification multiple of the current amplification unit 122 to the leakage current is controlled by the temperature value or the brightness value, so as to avoid that when the temperature is too large, the leakage current is too large, and when amplifying, the maximum amplification limit of the current amplification unit 122 is exceeded, resulting in that the result after amplification is inaccurate. The leakage current of the TFT is detected, and the voltage value of the gate low voltage is adjusted, so that the leakage current of the TFT of the display panel 200 is minimized under different temperatures and illuminations.

[0052] Reference Figure 8 As shown in FIG. 6, as the sixth embodiment of the present application, which is further refined and improved on the basis of the first embodiment, reference is made to FIG. 1. Figure 8 and Figure 9 As shown in FIG. 6, the leakage current generation module 110 comprises a pixel unit 113, the gate low voltage output module 120 comprises a voltage storage unit 127, a switch control unit 128 and a power supply chip 124, the input end of the switch control unit 128 is connected with the pixel unit 113 through a data line, and the leakage current output by the pixel unit 113 to the data line is input to the voltage storage unit 127 under the control of the switch control unit 128, and the power supply chip 124 generates a corresponding gate low voltage driving signal according to the voltage value stored in the voltage storage unit 127, and outputs the signal to the gate line of the display panel 200, so as to minimize the leakage current value on the data line in the display panel 200. The voltage storage unit 127 comprises a capacitor, and the switch control unit 128 comprises a first control switch.

[0053] In this embodiment, different from the second embodiment, the leakage current corresponding to the pixel unit 113 is directly collected, the leakage current on the data line is introduced into the voltage storage unit 127 on the control board 160, and is converted into a corresponding voltage value, and the power supply chip 124 adjusts the VGL according to the capacitor voltage in the voltage storage unit 127 to minimize the leakage current on the data line, thereby improving the vertical crosstalk problem.

[0054] Reference Figure 10 As shown in FIG. 11, as a seventh embodiment of the present application, a driving method is disclosed for driving the driving circuit 100 as described in any of the above embodiments to drive the display panel 200, the driving method comprising:

[0055] S1: obtaining the current value of the leakage current on the data line in the display panel;

[0056] S2: determining the voltage value of the gate low voltage output to the gate line of the display panel according to the current value of the leakage current, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and adjusting the current value of the leakage current on the data line in the display panel 200 to a minimum value.

[0057] Reference Figure 1 and Figure 10 As shown in FIG. 11, in the present embodiment, the driving method is implemented to drive the display panel 200 based on the above-described driving circuit 100, by monitoring the leakage current on the data line in real time, the system can dynamically perceive the leakage state of the pixel circuit, dynamically adjust the voltage value of the gate low voltage based on the current value of the leakage current, make the off state of the pixel circuit close to the theoretical optimal value, and realize the minimization of the leakage current.

[0058] As shown in FIG. 11, as a seventh embodiment of the present application, a driving method is disclosed for driving the driving circuit 100 as described in any of the above embodiments to drive the display panel 200, the driving method comprising: Figure 8 、 Figure 9 and Figure 11 As shown in FIG. 11, the step S1 comprises:

[0059] S11: outputting an unadjusted gate low voltage to the gate line of the display panel 200 in a first time period, outputting a gray scale data signal corresponding to a white picture to the data line, and controlling the switch control unit 128 to be off;

[0060] S12: outputting an unadjusted gate high voltage to the gate line of the display panel 200 in a second time period, outputting a zero gray scale data signal to the data line, and controlling the switch control unit 128 to be on, to obtain the leakage current on the data line in the display panel 200;

[0061] The step S2 comprises:

[0062] S21: in the second time period, the voltage storage unit receives the leakage current on the data line and converts the leakage current into a corresponding voltage value;

[0063] S22: After a preset time, a voltage value of a gate low voltage output to a gate line of the display panel 200 is determined based on a voltage value of the voltage storage unit, so as to generate a corresponding gate low voltage driving signal output to the gate line of the display panel 200, and a current value of the leakage current of the data line in the display panel 200 is adjusted to a minimum value.

[0064] In the embodiment, in a first time period, any data line on the display panel 200 is led back to the control panel 160 to charge the capacitor, and at the same time, the line passes through the control switch unit, the gate of the panel outputs the gate low voltage VGL, and the data line outputs the white picture, at this time, the storage capacitor is charged under the influence of the leakage current, and the switch control unit 128 on the control panel 160 is in the off state; the gate of the panel outputs the gate high voltage VGH, and the data line outputs 0, the switch control unit 128 on the control panel 160 is in the on state, and the charge of the storage capacitor flows to the capacitor on the control panel 160. After a preset time, the POWER IC detects the voltage of the capacitor, and the greater the voltage, the greater the leakage current, so that the POWER IC adjusts the gate low voltage VGL according to the voltage of the capacitor to minimize the leakage current.

[0065] Reference Figure 12 As shown in FIG. 9, as a ninth embodiment of the present application, a display device 300 is disclosed, which comprises a display panel 200 and a driving circuit 100 as described in any of the above, the driving circuit 100 drives the display panel 200 by using the driving method as described in any of the above.

[0066] It should be noted that the definition of each step in the present scheme does not limit the order of the steps, i.e., the steps written in the front can be executed first, or executed later, or even executed simultaneously, as long as the present scheme can be implemented, which should be considered as falling within the protection scope of the present application. The inventive concept of the present application can form very many embodiments, but the length of the application file is limited, and therefore, on the premise of not conflicting, the above-described embodiments or technical features can be combined to form new embodiments, and the combination of each embodiment or technical feature will enhance the original technical effect.

[0067] The above is a further detailed description of the present application in combination with specific optional embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or replacements can be made without departing from the concept of the present application, which should be considered as falling within the protection scope of the present application.

Claims

1. A drive circuit for driving a display panel, characterized by comprising: The driving circuit comprises: A leakage current generation module connected with any one data line in the display panel, generates leakage current and outputs to the connected data line; and A gate low voltage output module connected with the leakage current generation module, generates a gate low voltage based on the current value of the leakage current generated by the leakage current generation module; Wherein, the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generation module, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and adjusts the current value of the leakage current on the data line in the display panel to a minimum value. The leakage current generation module comprises a first thin film transistor and a second thin film transistor, and the gate low voltage output module comprises a leakage current addition unit, a filter unit, a current amplification unit, a resistance voltage division unit and a power supply chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are a first data line and an n-th data line respectively. The control end of the first thin film transistor and the control end of the second thin film transistor are connected with the power supply chip respectively, the input end of the first thin film transistor is connected with the first data line in the display panel, and the input end of the second thin film transistor is connected with the n-th data line in the display panel. The output end of the first thin film transistor and the output end of the second thin film transistor are connected with the leakage current addition unit respectively, and the leakage current addition unit performs addition calculation on the leakage current collected from the first thin film transistor and the second thin film transistor. The output end of the leakage current addition unit is connected with the input end of the filter unit, the output end of the filter unit is connected with the input end of the current amplification unit, and the filtered leakage current is output to the current amplification unit; the output end of the current amplification unit is connected with the input end of the resistance voltage division unit, and the amplified leakage current is output to the resistance voltage division unit; the output end of the resistance voltage division unit is connected with the power supply chip, and the divided voltage is output to the power supply chip. Wherein, the first thin film transistor and the second thin film transistor are formed in the same process as the thin film transistor in the pixel, and have the same model size and equal leakage current value; the power supply chip generates a corresponding gate low voltage driving signal output to the gate line of the display panel based on the divided voltage, so that the leakage current value on the data line in the display panel is minimized.

2. The drive circuit of claim 1, wherein The driving circuit further comprises a temperature detection module and a brightness detection module, the temperature detection module and the brightness detection module are connected with the current amplification unit respectively, the temperature detection module is used for detecting the temperature value of the display panel in real time, and the amplification multiple of the current amplification unit to the leakage current is controlled by the temperature value; the brightness detection module is used for detecting the brightness value of the display panel in real time, and the amplification multiple of the current amplification unit to the leakage current is controlled by the brightness value.

3. A drive circuit for driving a display panel, the drive circuit comprising: The driving circuit comprises: The leakage current generation module is connected with any one data line in the display panel, generates leakage current and outputs to the connected data line; and The gate low voltage output module is connected with the leakage current generation module, generates gate low voltage based on the current value of the leakage current generated by the leakage current generation module; The gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generation module, generates the corresponding gate low voltage driving signal output to the gate line of the display panel, and adjusts the current value of the leakage current on the data line in the display panel to the minimum value. The leakage current generation module includes a first thin film transistor and a second thin film transistor, and the gate low voltage output module includes a leakage current input control unit, a filter unit, a current amplification unit, a resistance voltage division unit and a power supply chip; along the scanning direction of the scanning line of the display panel, the two data lines close to the two sides of the display panel are a first data line and an n-th data line respectively; the leakage current input control unit includes a timing control circuit, a first switch and a second switch, and the timing control circuit outputs a switch control signal to control the conduction of the first switch and the second switch; the first switch is turned on at low level and turned off at high level, and the second switch is turned off at low level and turned on at high level; The control end of the first thin film transistor is connected with the power supply chip through the first switch, the control end of the second thin film transistor is connected with the power supply chip through the first switch, the input end of the first thin film transistor is connected with the first data line in the display panel, and the input end of the second thin film transistor is connected with the n-th data line in the display panel; The output end of the first thin film transistor and the output end of the second thin film transistor are connected with the input end of the filter unit respectively; the output end of the filter unit is connected with the input end of the current amplification unit, and the filtered leakage current is output to the current amplification unit; the output end of the current amplification unit is connected with the input end of the resistance voltage division unit, and the amplified leakage current is output to the resistance voltage division unit; the output end of the resistance voltage division unit is connected with the power supply chip, and the voltage after voltage division is output to the power supply chip; The first thin film transistor and the second thin film transistor are formed in the same process as the thin film transistor in the pixel, have the same model size, generate the leakage current with the same value, and the power supply chip generates the corresponding gate low voltage driving signal output to the gate line of the display panel based on the filtered, amplified and divided voltage of the leakage current generated by different thin film transistors, so that the leakage current value of the data line in the display panel is minimized at different times.

4. The drive circuit of claim 1, wherein The driving circuit further comprises a storage module, the storage module stores a first lookup table formed based on a relationship curve between the leakage current value and the gate low voltage, the gate low voltage output module determines the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current generated by the leakage current generation module and the first lookup table.

5. A driving method for driving the driving circuit according to any one of claims 1 to 4, wherein The driving method comprises: obtaining the current value of the leakage current on the data line in the display panel; determining the voltage value of the gate low voltage output to the gate line of the display panel based on the current value of the leakage current, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and to adjust the current value of the leakage current on the data line in the display panel to a minimum value.

6. The driving method of claim 5, wherein, The leakage current generation module comprises a pixel unit, and the gate low voltage output module comprises a voltage storage unit, a switch control unit and a power supply chip, the input end of the switch control unit is connected with the pixel unit through the data line; The step of obtaining the current value of the leakage current on the data line in the display panel comprises: in a first time period, outputting an unadjusted gate low voltage to the gate line of the display panel, outputting a gray scale data signal corresponding to a white picture to the data line, and controlling the switch control unit to be turned off; in a second time period, outputting an unadjusted gate high voltage to the gate line of the display panel, outputting a zero gray scale data signal to the data line, and controlling the switch control unit to be turned on, to obtain the leakage current on the data line in the display panel; The step of determining the voltage value of the gate low voltage output to the gate line of the display panel based on the detected current value of the leakage current, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and to adjust the current value of the leakage current on the data line in the display panel to a minimum value comprises: in the second time period, the voltage storage unit receives the leakage current on the data line, and converts the leakage current into a corresponding voltage value; after a preset time, determining the voltage value of the gate low voltage output to the gate line of the display panel based on the voltage value of the voltage storage unit, to generate a corresponding gate low voltage driving signal output to the gate line of the display panel, and to adjust the current value of the leakage current on the data line in the display panel to a minimum value.

7. A display device, characterized by comprising: The display device comprises a display panel and the driving circuit according to any one of claims 1-4, and the driving circuit drives the display panel by using the driving method according to any one of claims 5-6.

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