Display panel driving method, driving circuit, display panel and display device

Abstract

The present application relates to a display panel driving method, a driving circuit, a display panel and a display device. The method includes: when it is necessary to drive multiple columns of light-emitting devices in a target row to emit light, determining a first light-emitting device that needs to be pulled in sections; determining a target pull-down voltage required to drive the first light-emitting device to emit light; and pulling the column line voltage of the first light-emitting device in sections through multiple voltage output units whose output voltages are all different and the output voltages are all greater than or equal to the target pull-down voltage, so as to pull the column line voltage that controls the first light-emitting device in sections to the target pull-down voltage. The present application divides the pull-down voltage of the first light-emitting device that needs to execute the segmented pull strategy into multiple sections, thereby changing the large change of the line voltage that was originally completed at one time into multiple small changes, avoiding the influence of short-term large changes on other light-emitting devices, and solving the technical problem of interference between high-brightness images and low-brightness images.

Description

Technical Field

[0001] The present application relates to the field of LED display technology, and in particular to a display panel driving method, a driving circuit, a display panel and a display device. Background Art

[0002] With the development of LED display technology, LED display screens have put forward higher requirements for row drivers. Now, more powerful multifunctional row drivers can be realized. However, the disadvantage of poor anti-interference ability is becoming more and more prominent. For example, when high and low brightness images overlap in a row, the high brightness image will interfere with the low brightness image.

[0003] Currently, no effective solution has been proposed to the problem that high-brightness images interfere with low-brightness images. Summary of the invention

[0004] The present application provides a display panel driving method, a driving circuit, a display panel and a display device to solve the technical problem that a high-brightness image interferes with a low-brightness image.

[0005] According to one aspect of an embodiment of the present application, the present application provides a method for driving a display panel, comprising: when it is necessary to drive multiple columns of light-emitting devices in a target row to emit light, determining a first light-emitting device that needs to be pulled in segments; determining a target pull-down voltage required to drive the first light-emitting device to emit light; and pulling the column line voltage of the first light-emitting device in segments through multiple voltage output units whose output voltages are all different and whose output voltages are all greater than or equal to the target pull-down voltage, so as to pull the column line voltage that controls the first light-emitting device in segments to the target pull-down voltage.

[0006] Optionally, the column line voltage of the first light-emitting device is pulled in segments through multiple voltage output units whose output voltages are all different and are all greater than or equal to the target pull-down voltage, so as to pull the column line voltage that controls the first light-emitting device in segments down to the target pull-down voltage, including: detecting a row scan signal of the target row; when it is detected that the row scan signal is turned on, turning on the transistors corresponding to each of the voltage output units in sequence from large to small according to the output voltage of the voltage output unit, so as to pull the column line voltage down to the output voltage of each of the voltage output units in sequence, until the last voltage output unit is turned on, and the column line voltage is pulled down to the target pull-down voltage.

[0007] Optionally, when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time of any one of the transistors is greater than or equal to a first time threshold, and the sum of the on-times of all the transistors is greater than a second time threshold, the first time threshold is the minimum time required to complete the pull-down process in each stage, the second time threshold is the minimum time for the line voltage change to trigger a change in the light-emitting state of the second light-emitting device, and the second light-emitting device is a light-emitting device in the target row whose grayscale value is less than the grayscale value of the first light-emitting device.

[0008] Optionally, determining the first light-emitting device that needs to be pulled in segments includes: obtaining the grayscale values ​​of all the light-emitting devices in the target row, and determining the maximum grayscale value and the minimum grayscale value among all the grayscale values; calculating the difference between the maximum grayscale value and the minimum grayscale value; if the difference is greater than a preset threshold, determining the minimum grayscale value of the relatively high grayscale according to a preset ratio, the maximum grayscale value and the minimum grayscale value; and determining the light-emitting device in the target row whose grayscale value is greater than or equal to the minimum grayscale value of the relatively high grayscale as the first light-emitting device.

[0009] According to another aspect of an embodiment of the present application, the present application provides a driving circuit for a display panel, including a row driving unit and a column driving unit, the column driving unit including a timing controller, a plurality of voltage output units and a transistor corresponding to each of the voltage output units, wherein: the row driving unit is used to send a row scan signal to a plurality of rows of light-emitting devices; the plurality of voltage output units are used to provide a plurality of output voltages of different sizes; the timing controller is connected to each of the transistors, and is used to pull the column line voltage of the first light-emitting device on the target row in segments when the row scan signal of the target row is detected to be turned on, including: turning on the transistors corresponding to each of the voltage output units in sequence from large to small in accordance with the output voltages of the plurality of voltage output units, so as to pull down the column line voltage controlling the first light-emitting device in sequence to the output voltage of each of the voltage output units, until the last voltage output unit is turned on, and the column line voltage is pulled down to the target pull-down voltage, wherein the target pull-down voltage is the pull-down voltage required to drive the first light-emitting device to emit light.

[0010] Optionally, the timing controller is also used to control the on-time of each of the transistors, so that when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time of any one of the transistors is greater than or equal to a first time threshold, and the sum of the on-times of all the transistors is greater than a second time threshold, the first time threshold is the minimum time required to complete the pull-down process in each stage, the second time threshold is the minimum time for the line voltage change to trigger a change in the light-emitting state of the second light-emitting device, and the second light-emitting device is a light-emitting device in the target row whose grayscale value is less than the grayscale value of the first light-emitting device.

[0011] Optionally, the timing controller is also used to: obtain the grayscale values ​​of all light-emitting devices in the target row, and determine the maximum grayscale value and the minimum grayscale value among all the grayscale values; calculate the difference between the maximum grayscale value and the minimum grayscale value; if the difference is greater than a preset threshold, determine the minimum grayscale value of the relatively high grayscale based on a preset ratio, the maximum grayscale value and the minimum grayscale value.

[0012] Optionally, the column driving unit also includes a counting unit, which is connected to the timing controller, and is used to mark the light-emitting device in the target row whose grayscale value is greater than or equal to the minimum grayscale value of the relatively high grayscale as the first light-emitting device, and the timing controller is also used to determine the first light-emitting device as a light-emitting device that needs to be pulled in segments.

[0013] According to another aspect of the embodiments of the present application, the present application provides a display panel, including an array substrate, a color filter substrate, and a liquid crystal layer arranged between the array substrate and the color filter substrate, and the array substrate includes the driving circuit as described above.

[0014] According to another aspect of the embodiments of the present application, the present application provides a display device, including a backlight module and the above-mentioned display panel, wherein the backlight module is arranged on the backlight side of the array substrate for providing light source to the display panel.

[0015] The above technical solution provided by the embodiment of the present application has the following advantages compared with the related art:

[0016] The present application provides a method for driving a display panel, including: when it is necessary to drive multiple columns of light-emitting devices in a target row to emit light, determining a first light-emitting device that needs to be pulled in sections; determining a target pull-down voltage required to drive the first light-emitting device to emit light; and pulling the column line voltage of the first light-emitting device in sections through multiple voltage output units whose output voltages are all different and are all greater than or equal to the target pull-down voltage, so as to pull the column line voltage that controls the first light-emitting device in sections down to the target pull-down voltage. The present application divides the pull-down voltage of the first light-emitting device that needs to be pulled in sections into multiple sections, thereby changing the large change of the line voltage that was originally completed at one time into multiple small changes, avoiding the influence of short-term large changes on other light-emitting devices, and solving the technical problem of interference between high-brightness images and low-brightness images. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 A schematic diagram of interference caused by a high-brightness image on a low-brightness image;

[0020] Figure 2 This is a schematic diagram of a driving method of a display panel according to a first embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of a line voltage pull waveform in an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of a driving circuit of a display panel according to a second embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of the structure of the display panel of the third embodiment of the present application;

[0024] Figure 6 A schematic diagram of the structure of another display panel provided in Embodiment 3 of the present application;

[0025] Figure 7 This is a schematic diagram of the structure of the display device according to the fourth embodiment of the present application.

[0026] Explanation of the accompanying drawings: 1, row driving unit; 2, column driving unit; 201, timing controller; 202, voltage output unit; 203, transistor; LED1~6, light-emitting device; Scan1~3, row scanning signal; T1~3, three voltage output units; V1~3, respective output voltages of voltage output units T1~3; 100, array substrate; 200, backlight module; 300, color film substrate; 400, liquid crystal layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application and have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0029] For LED lamp drivers, such as Figure 1 As shown in the figure, if LED1 is turned off and LED2 is bright, this situation is most likely to cause high contrast interference problems. The more the ratio of high brightness to low brightness / even no brightness in a row, the more serious the interference phenomenon. The fundamental reason is that Figure 1 In the example, when LED1 is not on, the pull voltage of OUT2 driving LED2 changes too much, thus coupling to OUT1 through parasitic capacitance Cmutual. Capacitive coupling is caused by the characteristic of capacitance, that is, the voltage across the capacitor cannot change transiently. Figure 1 Theoretically, the voltage at end a will also change by the same amount as the voltage at end b. Therefore, due to the existence of capacitive coupling, if the voltage change time on one side of the capacitor is shorter and the change amplitude is larger, the other side of the capacitor will be more affected by interference.

[0030] In order to solve the problem that the high-brightness image interferes with the low-brightness image, according to one aspect of the embodiment of the present application, an embodiment of a method for driving a display panel is provided. The core idea for solving this problem is to control the voltage change within the change time in the actual display so that the LED 1 does not light up. The voltage change that can cause the LED 1 to light up can be divided into multiple sections, and then the problem can be solved.

[0031] The above-mentioned display panel driving method can be executed by a timing controller, such as Figure 2 As shown, the method may include the following steps:

[0032] Step S202, when it is necessary to drive multiple columns of light-emitting devices in a target row to emit light, determine the first light-emitting device that needs to be pulled in sections;

[0033] Step S204, determining a target pull-down voltage required to drive the first light-emitting device to emit light;

[0034] Step S206, segmentally pull the column line voltage of the first light-emitting device through multiple voltage output units whose output voltages are different and are greater than or equal to the target pull-down voltage, so as to segmentally pull down the column line voltage controlling the first light-emitting device to the target pull-down voltage.

[0035] Through the above steps S202 to S206, the present application divides the pull-down voltage of the first light-emitting device that needs to be pulled in segments into multiple segments, thereby changing the large change of the line voltage that was originally completed at one time into multiple small changes, avoiding the impact of short-term large changes on other light-emitting devices, and solving the technical problem of interference caused by high-brightness images on low-brightness images.

[0036] In step S202, the timing when the multiple columns of light-emitting devices in the target row need to be driven to emit light refers to when switching between rows, for example, after the scanning signal of the previous row is turned off and before the scanning signal of the current row is turned on. The first light-emitting device that needs to be pulled in sections is determined by the timing controller. The determination of whether the segmented pulling is required is to determine whether there is a light-emitting device with a large grayscale difference in the target row. Specifically, the first light-emitting device that needs to be pulled in sections includes:

[0037] Step 1, obtaining the grayscale values ​​of all light-emitting devices in the target row, and determining the maximum grayscale value and the minimum grayscale value among all the grayscale values;

[0038] Step 2, calculating the difference between the maximum grayscale value and the minimum grayscale value;

[0039] Step 3, if the difference is greater than a preset threshold, determining the minimum grayscale value of the relatively high grayscale according to the preset ratio, the maximum grayscale value and the minimum grayscale value;

[0040] Step 4: Determine the light-emitting device in the target row whose grayscale value is greater than or equal to the minimum grayscale value of the relatively high grayscale as the first light-emitting device.

[0041] If there are light-emitting devices with too large grayscale differences in the same row, it is easy to cause the high-grayscale light-emitting devices to interfere with the low-grayscale light-emitting devices. Therefore, the size of the preset threshold can be determined according to actual conditions or actual needs. The size of the preset threshold is inversely proportional to the anti-interference sensitivity, that is, the smaller the preset threshold, the higher the anti-interference sensitivity.

[0042] In the embodiment of the present application, the height of the grayscale is relative. For example, when a light-emitting device with a grayscale value of 30 is compared with a light-emitting device with a grayscale value of 120, 120 is a relatively high grayscale of 30, while when a light-emitting device with a grayscale value of 119 is compared with a light-emitting device with a grayscale value of 120, 120 is not a relatively high grayscale of 119. Therefore, the preset ratio can be set, such as 60%, and the sum of 60% of the grayscale difference and the minimum grayscale value can be used as the minimum grayscale value of the relatively high grayscale, such as the grayscale value of the light-emitting device in the target row. The maximum grayscale value is 120, the minimum grayscale value is 30, and the grayscale difference is 90, then 90*60%+30=84 is the minimum grayscale value of the relatively high grayscale in the target row, that is, in the target row, the grayscale values ​​between 84 and 120 all belong to the relatively high grayscale in the row. In order to reduce the interference of the relatively high grayscale light-emitting devices on the relatively low grayscale light-emitting devices, the relatively high grayscale light-emitting devices need to be segmented and pulled, and the light-emitting devices between 84 and 120 can be determined as the first light-emitting devices.

[0043] In step S204, the target pull-down voltage required by each light-emitting device may be the same voltage value, or different voltage values ​​may be set according to actual conditions or component characteristics of each light-emitting device.

[0044] In step S206, the step of pulling the column line voltage of the first light-emitting device in sections by using a plurality of voltage output units whose output voltages are all different and whose output voltages are all greater than or equal to the target pull-down voltage, so as to pull down the column line voltage controlling the first light-emitting device in sections to the target pull-down voltage, comprises:

[0045] Step 1, detecting a row scanning signal of the target row;

[0046] Step 2, when it is detected that the row scan signal is turned on, the transistors corresponding to each of the voltage output units are turned on in sequence from large to small in the order of the output voltage of the voltage output unit, so as to pull the column line voltage down to the output voltage of each of the voltage output units in sequence, until the last voltage output unit is turned on, and the column line voltage is pulled down to the target pull-down voltage.

[0047] In the embodiment of the present application, the segmented pull-down of the column line voltage is achieved by using multiple voltage output units with different output voltages. The timing controller controls each voltage output unit to be connected to the signal line of the target column one by one in the order of output voltage from large to small. The target column is the column where the first light-emitting device is located, so that the column line voltage of the target column is gradually reduced in a step-like manner. Finally, the column line voltage is pulled down to the target pull-down voltage by the last voltage output unit. At this time, the first light-emitting device on this column can be displayed normally. Since the pull-down voltage of the column line voltage on the column is divided into multiple sections, the total pull-down time is extended. Both the single voltage change and the total change time are insufficient to interfere with the low-grayscale light-emitting device, thereby solving the technical problem that the high-brightness picture interferes with the low-brightness picture.

[0048] Take three voltage output units as an example, the output voltages are V1, V2, and V3 from large to small, and the transistors corresponding to each voltage output unit are T1, T2, and T3. Figure 3 As shown in the waveform, Gn is the row scan signal of the target row. When Gn generates a rising edge, it indicates that the row scan signal of the target row is turned on. Sn is the pull-down scheme of the column line voltage in the related art, that is, directly pulling the column line voltage down to the minimum. This short-term and large-amplitude voltage change is very likely to interfere with low-grayscale light-emitting devices. The column line voltage pull-down waveform of the technical solution of the present application is as shown in Sn'. The timing controller first turns on the transistor T1, turns off T2 and T3, to pull the column line voltage down to V1. After time t1, the timing controller turns on the transistor T2, turns off T1 and T3, to pull the column line voltage down to V2. After time t2, the timing controller turns on the transistor T3, turns off T1 and T2, to pull the column line voltage down to the target pull-down voltage V3, and the first light-emitting device on the column starts to display normally.

[0049] In practical applications, the number of voltage output units and paired transistors can be set according to actual needs. At the same time, multiple groups of voltage output units and paired transistors can be set, each group corresponding to a column of light-emitting devices, or one group of voltage output units and paired transistors can be set to regulate the column line voltage of each column through a group of voltage output units and paired transistors.

[0050] In the embodiment of the present application, when the transistor corresponding to any of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time of any of the transistors is greater than or equal to the first time threshold, and the sum of the on-times of all the transistors is greater than the second time threshold, the first time threshold is the minimum time required to complete the pull-down process of each stage, and the second time threshold is the minimum time for the line voltage change to trigger the change of the light-emitting state of the second light-emitting device, and the second light-emitting device is a light-emitting device in the target row whose grayscale value is less than the grayscale value of the first light-emitting device. The second time threshold can be set according to actual conditions. The present application can divide the pull-down voltage of the high-grayscale light-emitting device into multiple sections and extend the pull-down time, so that neither the single voltage change nor the total change time is sufficient to interfere with the low-grayscale light-emitting device, thereby solving the technical problem that the high-brightness picture causes interference to the low-brightness picture.

[0051] According to another aspect of the embodiment of the present application, the present application provides a driving circuit of a display panel, such as Figure 4 As shown, it includes a row driving unit 1 and a column driving unit 2, wherein the column driving unit 2 includes a timing controller 201, a plurality of voltage output units 202 and a transistor 203 corresponding to each of the voltage output units, wherein:

[0052] The row driving unit 1 is used to send row scanning signals (Scan1, Scan2, Scan3, etc.) to multiple rows of light emitting devices LED;

[0053] The multiple voltage output units 202 are used to provide multiple output voltages of different magnitudes;

[0054] The timing controller 201 is connected to each of the transistors 203, and is used to pull the column line voltage of the first light-emitting device on the target row in segments when it is detected that the row scan signal of the target row is turned on, including: turning on the transistors corresponding to each of the voltage output units in sequence from large to small according to the output voltages of the multiple voltage output units, so as to pull down the column line voltage controlling the first light-emitting device to the output voltage of each of the voltage output units in sequence, until the last voltage output unit is turned on, and the column line voltage is pulled down to the target pull-down voltage, wherein the target pull-down voltage is the pull-down voltage required to drive the first light-emitting device to emit light.

[0055] In the embodiment of the present application, the segmented pull-down of the column line voltage is achieved by using multiple voltage output units with different output voltages. The timing controller controls each voltage output unit to be connected to the signal line of the target column one by one in the order of output voltage from large to small. The target column is the column where the first light-emitting device is located, so that the column line voltage of the target column is gradually reduced in a step-like manner. Finally, the column line voltage is pulled down to the target pull-down voltage by the last voltage output unit. At this time, the first light-emitting device on this column can be displayed normally. Since the pull-down voltage of the column line voltage on the column is divided into multiple sections, the total pull-down time is extended. Both the single voltage change and the total change time are insufficient to interfere with the low-grayscale light-emitting device, thereby solving the technical problem that the high-brightness picture interferes with the low-brightness picture.

[0056] Optionally, the timing controller is also used to control the on-time of each of the transistors, so that when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time of any one of the transistors is greater than or equal to a first time threshold, and the sum of the on-times of all the transistors is greater than a second time threshold, the first time threshold is the minimum time required to complete the pull-down process in each stage, the second time threshold is the minimum time for the line voltage change to trigger a change in the light-emitting state of the second light-emitting device, and the second light-emitting device is a light-emitting device in the target row whose grayscale value is less than the grayscale value of the first light-emitting device.

[0057] In the embodiment of the present application, the second time threshold can be set according to the actual situation. The present application can divide the pull-down voltage of the high grayscale light-emitting device into multiple sections and extend the pull-down time, so that neither the single voltage change nor the total change time is sufficient to interfere with the low grayscale light-emitting device, thereby solving the technical problem that the high-brightness picture interferes with the low-brightness picture.

[0058] Optionally, the timing controller is also used to: obtain the grayscale values ​​of all light-emitting devices in the target row, and determine the maximum grayscale value and the minimum grayscale value among all the grayscale values; calculate the difference between the maximum grayscale value and the minimum grayscale value; if the difference is greater than a preset threshold, determine the minimum grayscale value of the relatively high grayscale based on a preset ratio, the maximum grayscale value and the minimum grayscale value.

[0059] Optionally, the column driving unit also includes a counting unit, which is connected to the timing controller, and is used to mark the light-emitting device in the target row whose grayscale value is greater than or equal to the minimum grayscale value of the relatively high grayscale as the first light-emitting device, and the timing controller is also used to determine the first light-emitting device as a light-emitting device that needs to be pulled in segments.

[0060] Below Figure 5The driving method and driving circuit of the display panel provided in the present application are described by taking the example.

[0061] like Figure 5 As shown, in the driving circuit of the display panel, the column driving unit includes a voltage output unit with output voltages V1, V2, and V3, each voltage output unit corresponds to a transistor T1, T2, and T3, and also includes a counting unit and a timing controller.

[0062] During the driving process of the display panel, when switching between rows (for example, after Scan1 is turned off and before Scan2 is turned on), the timing controller calculates the difference between the highest grayscale and the lowest grayscale in the Scan2 row. Once this difference exceeds the preset threshold, the counting unit marks the high-grayscale light-emitting device in the Scan2 row and sends an enable signal to the timing controller, and the segmented pull-down function is turned on for this row. After Scan2 is turned on, the timing controller first sends a signal to turn on T1, turn off T2 and T3, and the column line voltage is equal to V1. After time t1, a signal is first sent to turn on T2, turn off T1 and T3, and the column line voltage is equal to V2. After time t2, a signal is first sent to turn on T3, turn off T1 and T2, and the column line voltage is equal to V3, at which time this column begins to display normally. Because the amount of voltage change each time is not enough to cause the low-grayscale light-emitting device to be triggered by mistake, the technical problem of interference between the high-brightness picture and the low-brightness picture is solved.

[0063] According to another aspect of the embodiments of the present application, the present application provides an embodiment of a display panel, such as Figure 6 As shown, the display panel includes an array substrate 100 , a color filter substrate 300 , and a liquid crystal layer 400 disposed between the array substrate 100 and the color filter substrate 300 , and the array substrate 100 includes the driving circuit as described above.

[0064] According to another aspect of the embodiments of the present application, the present application provides an embodiment of a display device, such as Figure 7 As shown, the display device includes a backlight module 200 and the above-mentioned display panel. The backlight module 200 is arranged on the backlight side of the array substrate 100 to provide light source to the display panel.

[0065] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for driving a display panel, characterized in that: include: When it is necessary to drive multiple columns of light-emitting devices in a target row to emit light, determining a first light-emitting device that needs to be pulled in sections; determining a target pull-down voltage required to drive the first light-emitting device to emit light; The column line voltage of the first light-emitting device is pulled in sections by a plurality of voltage output units whose output voltages are all different and are all greater than or equal to the target pull-down voltage, so as to pull down the column line voltage controlling the first light-emitting device in sections to the target pull-down voltage; The first light emitting device that is determined to be pulled in sections comprises: Obtaining grayscale values ​​of all light-emitting devices in the target row, and determining a maximum grayscale value and a minimum grayscale value among all grayscale values; Calculating a difference between the maximum grayscale value and the minimum grayscale value; If the difference is greater than a preset threshold, determining a minimum grayscale value of a relatively high grayscale according to a preset ratio, the maximum grayscale value, and the minimum grayscale value; A light-emitting device having a grayscale value greater than or equal to the minimum grayscale value of the relatively high grayscale in the target row is determined as the first light-emitting device.

2. The method according to claim 1, characterized in that The step of pulling the column line voltage of the first light-emitting device in sections by using a plurality of voltage output units whose output voltages are all different and are all greater than or equal to the target pull-down voltage, so as to pull down the column line voltage controlling the first light-emitting device in sections to the target pull-down voltage, comprises: Detecting a row scanning signal of the target row; When it is detected that the row scan signal is turned on, the transistors corresponding to each of the voltage output units are turned on in sequence from large to small according to the output voltage of the voltage output unit, so as to pull the column line voltage down to the output voltage of each of the voltage output units in sequence, until the last voltage output unit is turned on, and the column line voltage is pulled down to the target pull-down voltage.

3. The method according to claim 2, characterized in that When the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time of any one of the transistors is greater than or equal to a first time threshold, and the sum of the on-times of all the transistors is greater than a second time threshold, the first time threshold is the minimum time required to complete the pull-down process in each stage, the second time threshold is the minimum time for the line voltage change to trigger a change in the light-emitting state of the second light-emitting device, and the second light-emitting device is a light-emitting device in the target row whose grayscale value is less than the grayscale value of the first light-emitting device.

4. A driving circuit for a display panel, comprising a row driving unit and a column driving unit, characterized in that: The column driving unit includes a timing controller, a plurality of voltage output units, and a transistor corresponding to each of the voltage output units, wherein: The row driving unit is used to send row scanning signals to multiple rows of light emitting devices; The multiple voltage output units are used to provide multiple output voltages of different magnitudes; The timing controller is connected to each of the transistors, and is used to pull the column line voltage of the first light-emitting device on the target row in sections when the row scan signal of the target row is detected to be turned on, including: sequentially turning on the transistors corresponding to each of the voltage output units in order from large to small according to the output voltages of the multiple voltage output units, so as to sequentially pull down the column line voltage controlling the first light-emitting device to the output voltage of each of the voltage output units, until the last voltage output unit is turned on, and the column line voltage is pulled down to the target pull-down voltage, wherein the target pull-down voltage is the pull-down voltage required to drive the first light-emitting device to emit light; The timing controller is also used to: obtain the grayscale values ​​of all light-emitting devices in the target row, and determine the maximum grayscale value and the minimum grayscale value among all the grayscale values; calculate the difference between the maximum grayscale value and the minimum grayscale value; if the difference is greater than a preset threshold, determine the minimum grayscale value of the relatively high grayscale based on a preset ratio, the maximum grayscale value and the minimum grayscale value.

5. The driving circuit according to claim 4, characterized in that: The timing controller is also used to control the on-time of each of the transistors, so that when the transistor corresponding to any one of the voltage output units is turned on, the transistors corresponding to the other voltage output units are turned off, the on-time of any one of the transistors is greater than or equal to a first time threshold, and the sum of the on-times of all the transistors is greater than a second time threshold, the first time threshold is the minimum time required to complete the pull-down process of each stage, the second time threshold is the minimum time for the line voltage change to trigger a change in the light-emitting state of the second light-emitting device, and the second light-emitting device is a light-emitting device in the target row whose grayscale value is less than the grayscale value of the first light-emitting device.

6. The driving circuit according to claim 4, characterized in that: The column driving unit also includes a counting unit, which is connected to the timing controller. The counting unit is used to mark the light-emitting device in the target row whose grayscale value is greater than or equal to the minimum grayscale value of the relatively high grayscale as a first light-emitting device. The timing controller is also used to determine the first light-emitting device as a light-emitting device that needs to be pulled in segments.

7. A display panel comprising an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate, characterized in that: The array substrate comprises the driving circuit as claimed in any one of claims 4 to 6.

8. A display device, characterized in that: It comprises a backlight module and the display panel as claimed in claim 7, wherein the backlight module is arranged on the backlight side of the array substrate and is used to provide light source to the display panel.

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