Gamma debugging method and device for display panel

Abstract

The embodiment of the present invention discloses a gamma debugging method and device for a display panel, by adjusting at least the compensation subframe parameters corresponding to the compensation subframe according to the actual test brightness corresponding to the original subframe grayscale adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve and the target brightness of the display grayscale to be compensated, and when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, the corresponding original subframe parameters and compensation subframe parameters of the original subframe are determined as the target gamma data of the display grayscale to be compensated. The technical solution of this embodiment can reduce the grayscale redundancy during gamma debugging, thereby improving the scanning utilization rate and improving the problem of insufficient scanning time.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technologies, and in particular, to a gamma debugging method and device for a display panel. Background Art

[0002] With the development of display technologies, in order to improve the screen image quality, it is usually necessary to perform gamma debugging on a display panel.

[0003] In the prior art, when driving a display panel in a digital driving manner, there are problems of gray-scale redundancy, low scan utilization rate, and insufficient scan time during gamma debugging. Summary of the Invention

[0004] The present invention provides a gamma debugging method and device for a display panel to reduce gray-scale redundancy, improve scan utilization rate, and increase row scan duration.

[0005] In a first aspect, an embodiment of the present invention provides a gamma debugging method for a display panel, including:

[0006] Determining a display gray level to be compensated according to a test curve and a target brightness corresponding to the display gray level; wherein the test curve is a relationship curve between the original sub-frame gray level corresponding to different relative emission durations at the original data bit and the actually measured brightness, and the original sub-frame gray levels are all integers;

[0007] Adding a compensation sub-frame in one frame, at least adjusting the compensation sub-frame parameters corresponding to the compensation sub-frame according to the coordinate points of the target brightness of the display gray level to be compensated on the test curve for the original sub-frame gray levels adjacent thereto, and when the difference between the actually debugged brightness after adjustment and the target brightness of the display gray level to be compensated is less than a set threshold, determining the relative emission duration, the data voltage of the original sub-frame, and the compensation sub-frame parameters of the original sub-frame at the display gray level to be compensated as the target gamma data of the display gray level to be compensated;

[0008] Wherein the original sub-frame parameters include the number of original sub-frames, the relative emission duration of the original sub-frames, and the data voltage corresponding to the original sub-frames; the compensation sub-frame parameters include the number of compensation sub-frames, the relative emission duration of the compensation sub-frames, and the data voltage corresponding to the compensation sub-frames.

[0009] Optionally, for the compensation sub-frame located at the m-th position, the relative emission duration of the compensation sub-frame is less than or equal to 2 m-1 times that of the original sub-frame with the shortest relative emission duration among the original sub-frames, where n < m ≤ n + q, where n represents the number of bits of the original data bit, q represents the number of compensation sub-frames, and among the compensation sub-frames, at least the relative emission duration of the compensation sub-frame at the i-th position is less than 2 i-1 times that of the shortest original sub-frame with the shortest relative emission duration among the original sub-frames, where the compensation sub-frame at the i-th position is any sub-frame among the compensation sub-frames;

[0010] The data bits where each compensation subframe is located are located after the original data bits.

[0011] Optionally, determining the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale includes:

[0012] Determine the coordinate point of the target brightness corresponding to each display grayscale on the test curve;

[0013] It is determined whether the original subframe grayscale corresponding to the coordinate point is an integer. When the original subframe grayscale corresponding to the coordinate point is not an integer, the display grayscale corresponding to the target brightness at the coordinate point is determined as the display grayscale to be compensated.

[0014] Optionally, determining the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale further includes:

[0015] Determine whether the original subframe grayscale corresponding to the coordinate point is greater than the maximum original subframe grayscale or less than the minimum original subframe grayscale. If the original subframe grayscale corresponding to the coordinate point is greater than the maximum original subframe grayscale or less than the minimum original subframe grayscale, determine the display grayscale of the target brightness at the coordinate point as the display grayscale to be compensated.

[0016] Optionally, a compensation subframe is added to a frame, and at least a compensation subframe parameter corresponding to the compensation subframe is adjusted according to the target brightness of the display grayscale to be compensated at the coordinate point of the original subframe adjacent to the coordinate point on the test curve, and when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, the original subframe parameter and the compensation subframe parameter corresponding to the original subframe at the display grayscale to be compensated are determined as the target gamma data of the display grayscale to be compensated, including:

[0017] Determine the target subframe grayscale corresponding to the display grayscale to be compensated according to the original subframe grayscales adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test relationship curve;

[0018] The data voltage corresponding to the original subframe and the compensation subframe parameters corresponding to the compensation subframe are adjusted according to the target subframe grayscale. When the difference between the actual debugging brightness after adjustment and the target brightness of the grayscale to be compensated is less than the set threshold, the relative luminous duration of the original subframe, the data voltage of the original subframe and the compensation subframe parameters are determined as the target gamma data of the grayscale to be compensated.

[0019] Optionally, the maximum number of compensation subframes is 3.

[0020] Optionally, the number of compensation subframes is 2, the relative luminous duration of one compensation subframe is less than the minimum relative luminous duration of the original subframe, and the relative luminous duration of the other compensation subframe is greater than the relative luminous duration of the set original subframe, and the original subframe is set to any subframe among the original subframes.

[0021] Optionally, a compensation subframe is added to a frame, and at least a compensation subframe parameter corresponding to the compensation subframe is adjusted according to the actual test brightness corresponding to the original subframe grayscale adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve and the target brightness of the display grayscale to be compensated. When the difference between the adjusted actual test brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, after the original subframe parameter and the compensation subframe parameter corresponding to the original subframe are determined as the target gamma data of the display grayscale to be compensated, the method further includes:

[0022] Determine the sub-pixel to be compensated according to the brightness difference of each sub-pixel of the same color at a preset gray scale;

[0023] According to the brightness difference between the sub-pixel to be compensated and other sub-pixels at the same detection grayscale, the data voltage corresponding to the sub-pixel in the original sub-frame and the compensation sub-frame parameters corresponding to the compensation sub-frame are adjusted; when the difference between the adjusted actual debugging brightness of the sub-pixel to be compensated and the brightness of other sub-pixels is less than a set threshold, the relative luminous duration of the sub-pixel to be compensated in the original sub-frame corresponding to the detection grayscale, the data voltage of the original sub-frame and the compensation sub-frame parameters are determined as the updated target gamma data of the sub-pixel to be compensated at the detection grayscale.

[0024] Optionally, after determining the sub-pixel to be compensated according to the brightness difference of each sub-pixel of the same color under a preset gray scale, it also includes: determining the compensation parameter corresponding to the sub-pixel to be compensated according to the brightness of the sub-pixel to be compensated and the brightness of other sub-pixels under different display gray scales; after determining the updated target gamma data of the sub-pixel to be compensated under the detected gray scale, it also includes: establishing a corresponding relationship between the compensation parameter of the sub-pixel to be compensated and the updated target gamma data.

[0025] Optionally, before determining the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale, the method further includes: determining the target brightness corresponding to each grayscale according to the gamma curve of the display panel.

[0026] In a second aspect, an embodiment of the present invention further provides a gamma adjustment device for a display panel, comprising:

[0027] The display grayscale determination module to be compensated is used to determine the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale; wherein the test curve is a relationship curve between the original subframe grayscale corresponding to different relative luminous durations under the original data bit and the actual test brightness, and the original subframe grayscales are all integers;

[0028] A target gamma data determination module is used to add a compensation subframe in a frame, and adjust at least the compensation subframe parameters corresponding to the compensation subframe according to the target brightness of the display grayscale to be compensated at the coordinate point of the original subframe adjacent to the coordinate point on the test curve, and when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, the original subframe parameters and the compensation subframe parameters corresponding to the original subframe at the display grayscale to be compensated are determined as the target gamma data of the display grayscale to be compensated;

[0029] The original subframe parameters include the number of original subframes, the relative luminous duration of the original subframes and the data voltage corresponding to the original subframes; the compensated subframe parameters include the number of compensated subframes, the relative luminous duration of the compensated subframes and the data voltage corresponding to the compensated subframes.

[0030] The gamma debugging method and device of the display panel provided by the embodiment of the present invention adjust at least the compensation subframe parameters corresponding to the compensation subframe according to the actual test brightness corresponding to the original subframe grayscale adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve and the target brightness of the display grayscale to be compensated. When the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, the original subframe parameters and the compensation subframe parameters corresponding to the original subframe at the display grayscale to be compensated are determined as the target gamma data of the display grayscale to be compensated; and then the compensation subframe parameters that need to be performed can be determined according to the actual test curve of the display panel. The display grayscale is obtained, and when performing gamma debugging, a compensation subframe is introduced, and the number of compensation subframes and the relative luminous duration can be adjusted according to the target brightness of the display grayscale to be compensated, so that the relative luminous duration of the compensation subframe can match the relative luminous duration corresponding to the target brightness of the display grayscale to be compensated, that is, in the compensation subframe, the relative luminous duration does not have to increase at an exponential level. Therefore, compared with the prior art, the method of increasing the data bit and increasing the luminous duration of different subframes at an exponential level for gamma debugging is beneficial to reducing grayscale redundancy during gamma debugging, thereby improving the scanning utilization rate and improving the problem of insufficient scanning time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of a gamma debugging method for a display panel provided by an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of a test curve provided by an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of a gamma curve provided by an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of sub-frame division for driving a pixel circuit in a display panel within a frame in the prior art;

[0035] Figure 5 It is a schematic diagram of sub-frame division for driving a pixel circuit in a display panel within a frame provided by an embodiment of the present invention;

[0036] Figure 6 is a flow chart of another gamma debugging method for a display panel provided by an embodiment of the present invention;

[0037] Figure 7 is a flow chart of another gamma debugging method for a display panel provided by an embodiment of the present invention;

[0038] Figure 8 It is a structural schematic diagram of a gamma debugging device for a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] As described in the background technology, in the prior art, when the display panel is driven by a digital driving method, there are problems such as grayscale redundancy, low scanning utilization rate, and insufficient scanning time during gamma debugging. The inventors have found that the reason for the above problems is that there are many uncontrollable factors in the process of forming the display panel, such as the backplane, LED chip production, transfer, repair and other processes and the presence of dust particles, which cause the grayscale value to jump. The grayscale value jump needs to be solved by increasing the number of bits (data bits) of display data when the digitally driven display panel is gamma debugged. However, the way to increase the number of bits of display data is to increase the scanning subframe in one frame. For example, when the display panel driven by a digital driving method needs to display 256 grayscales, one frame can be divided into 8 subframes (corresponding to 8 bits of display data). However, if the display panel has a jump in grayscale value, a frame needs to be divided into more subframes for gamma debugging, and the luminous duration of different subframes increases exponentially. For example, it is divided into 10 subframes (the corresponding display data bit number is 10 bits, and the corresponding grayscale number is 1024). When gamma debugging is performed, 256 values ​​are mainly selected from 1024 discrete brightness values. Therefore, the utilization rate of the scanning time is 256 / 1024=1 / 4 when the number of bits (data bits) of the display data is 8 bits, and the scanning time of each row is also correspondingly changed to 1 / 4 when the number of bits of the display data is 8 bits, resulting in grayscale redundancy, low scanning utilization, and insufficient scanning time during gamma debugging. In the prior art, some display panels use a digital-analog hybrid drive method to reduce the problems of grayscale redundancy and low scanning utilization, but the digital-analog hybrid drive method has complex timing control, high power consumption, and a relatively large size of the driver chip.

[0041] Based on the above reasons, this embodiment provides a gamma adjustment method for a display panel. Figure 1 is a flowchart of a gamma debugging method for a display panel provided by an embodiment of the present invention, with reference to Figure 1 , the gamma debugging method of the display panel includes:

[0042] Step 110, determine the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale; wherein the test curve is a relationship curve between the original subframe grayscale corresponding to different relative luminous durations under the original data bit and the actual test brightness, and the original subframe grayscale is an integer.

[0043] The original data bits are data bits corresponding to the total number of grayscales that can be displayed in the display panel. For example, when the total number of grayscales that can be displayed by the display panel is 256, the original data bits are 8 bits, and the corresponding number of original subframes is 8. The original subframe grayscale can be calculated by the following formula:

[0044] Gray s=h1*data1+h2*data2+……+h n *data n ,

[0045] Among them, Gray s Indicates the original subframe grayscale, h1, h2...h n represents the time ratio of the first original subframe, the second original subframe...the nth original subframe in a frame, data1 represents the data voltage corresponding to the first original subframe, data2 represents the data voltage corresponding to the second original subframe...data n represents the data voltage corresponding to the nth original subframe, wherein n represents the total number of original subframes included in one frame.

[0046] Among them, this embodiment is applicable to the gamma adjustment of the digital drive display panel, so the data voltage has only two cases of 0 and 1, wherein the data voltage 0 corresponds to the voltage that can turn off the driving transistor in the pixel circuit of the display panel, and the data voltage 1 corresponds to the voltage that can turn on the driving transistor in the pixel circuit of the display panel. Still taking the total number of gray scales that the display panel can display as 256, the original data bit is 8 bits, and the corresponding original sub-frame number is 8 as an example, the luminous time ratio of the 8 sub-frames is 1:2:2 2 :2 3 :2 4 :2 5 :2 6 :2 7 By controlling the data voltage of each subframe, different original subframe grayscales can be obtained. For example, when the data voltages of 8 subframes are 1, 0, 0, 0, 0, 0, 0, respectively, the corresponding original subframe grayscale is 1; when the data voltages of 8 subframes are 1, 0, 0, 1, 0, 0, 0, 0, respectively, the corresponding original subframe grayscale is 9.

[0047] Specifically, the test curve can be obtained by testing the display panel when the data bits correspond to the original data bits, and the actual test brightness corresponding to the grayscale of each original subframe is obtained by controlling the data in each original subframe, thereby obtaining the test curve. Figure 2It is a schematic diagram of the test curve provided by an embodiment of the present invention, wherein the horizontal axis Grays represents the original sub-frame grayscale, and the vertical axis LV represents the brightness. Under an ideal display effect, the test curve should be a straight line. Since the human eye's perception of brightness is nonlinear, it is necessary to perform gamma debugging on the display panel for correction. When performing gamma debugging, it is first necessary to determine the target brightness of each display grayscale based on the gamma curve (a curve of display grayscale Grayz and brightness percentage LV%, where the brightness percentage is equal to the ratio of the brightness corresponding to the display grayscale to the brightness corresponding to the maximum display grayscale), and then determine whether the target brightness of the display grayscale can find the original sub-frame grayscale corresponding to the same brightness on the test curve. If it can be found, then there is no need to compensate for the display grayscale; if it cannot be found, then the display grayscale needs to be compensated, and the grayscale that needs to be compensated is the display grayscale to be compensated.

[0048] It should be noted here that the display grayscale may not be equal to the original sub-frame grayscale. The correspondence between the display grayscale and the original sub-frame grayscale needs to be determined based on the brightness. For example, when the display grayscale is 64, the corresponding target brightness is determined to be 30nit according to the gamma curve. In the test curve, the original sub-frame grayscale corresponding to the brightness of 30nit is 30, so the display grayscale of 64 corresponds to the original sub-frame grayscale of 30.

[0049] Figure 3 is a schematic diagram of a gamma curve provided by an embodiment of the present invention, and the gamma curve may be a Gamma2.2 curve. For example, the grayscale displayed is 125 grayscales ( Figure 3 When the target brightness is 60 nit, the gamma curve determines that the corresponding target brightness is 60 nit. According to the target brightness 60 nit, the coordinate point can be found on the test curve. Figure 2 The original subframe grayscale corresponding to the N point in the middle) is between the 62 grayscale and the 63 subframe grayscale, and the original subframe grayscales are all integers, so the original subframe grayscale corresponding to the 60nit brightness cannot be found on the test curve, that is, under the original data bit, by controlling the data of each original subframe, the brightness display of 60nit cannot be achieved. Therefore, the 125 display grayscale can be determined as the display grayscale to be compensated. On the contrary, if for a certain display grayscale, its corresponding target brightness can find the corresponding original subframe grayscale on the test curve, then the display grayscale is not determined as the display grayscale to be compensated. Exemplarily, for the 230 display grayscale, if its corresponding target brightness is determined to be 250nit according to the gamma curve, and on the test curve, the original subframe grayscale corresponding to the brightness of 250nit (235 original subframe grayscale) can be found, then the 230 grayscale is not determined as the display grayscale to be compensated.

[0050] Continue to refer Figure 2, the slope of the test curve between the first line P1 and the second line P2 suddenly changes, and the slope of the test curve between the third line P3 and the fourth line P4 also suddenly changes. Therefore, when the target brightness falls on the test curve between the first line P1 and the second line P2 and the test curve between the third line P3 and the fourth line P4, the probability that the display grayscale corresponding to the target brightness is the grayscale that needs to be compensated is relatively high. Therefore, it is also possible to preferentially find the brightness range corresponding to the slope sudden change on the test curve, and determine whether the brightness range is between the brightness corresponding to the two adjacent original subframes; if so, determine whether the target brightness corresponding to the display grayscale is within the brightness range; if so, determine the display grayscale as the display grayscale to be compensated, and then quickly find the display grayscale to be compensated.

[0051] Step 120, adding a compensation subframe to a frame, and adjusting at least the compensation subframe parameters corresponding to the compensation subframe according to the original subframe grayscale adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve; when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, the original subframe parameters and the compensation subframe parameters corresponding to the original subframe at the display grayscale to be compensated are determined as the target gamma data of the display grayscale to be compensated.

[0052] The original subframe parameters include the number of original subframes, the relative luminous duration of the original subframes and the data voltage corresponding to the original subframes; the compensated subframe parameters include the number of compensated subframes, the relative luminous duration of the compensated subframes and the data voltage corresponding to the compensated subframes.

[0053] The number of original subframes and the relative luminous duration of the original subframes are fixed, and the number of original subframes and the relative luminous duration of the original subframes in the target gamma data can be preset.

[0054] In this embodiment, when the target brightness corresponding to the grayscale to be compensated cannot be achieved by controlling the original subframe data (i.e., data voltage) under the original data bit, the compensation subframe can be introduced, and at least one of the number of compensation subframes, the relative luminous duration of the compensation subframes, and the data voltage corresponding to the compensation subframe included in the compensation subframe parameters can be adjusted to enable the display panel to display the target brightness corresponding to the grayscale to be compensated. Specifically, the original subframe grayscale actually corresponding to the target brightness can be determined according to the coordinate point of the target brightness of the grayscale to be compensated on the test curve (the original subframe grayscale cannot be achieved by controlling the data voltage of each original subframe, hereinafter referred to as the target subframe grayscale), and then the original subframe grayscale adjacent to the target subframe grayscale that can be achieved by controlling the data of each original subframe is determined, and the data voltage of the original subframe grayscale in each original subframe is determined, and the number of original subframes, the relative luminous duration of each original subframe, and the determined data voltage of each original subframe are determined as the original subframe data in the target gamma data. Finally, according to the determined distance between the original subframe grayscale adjacent to the target subframe grayscale and the target subframe grayscale, at least one of the number of compensation subframes included in the compensation subframe parameters, the relative luminous duration of the compensation subframes and the data voltage corresponding to the compensation subframes is adjusted, so that the relative luminous duration within a frame matches the display grayscale to be compensated through the combination of the compensation subframe parameters and the original subframe parameters (that is, when the difference between the actual debugging brightness of the display panel after adjustment and the target brightness of the display grayscale to be compensated is less than the set threshold, it is considered that the relative luminous duration within a frame matches the display grayscale to be compensated), so that the display panel can achieve the display of the target brightness.

[0055] When adjusting the number of compensation subframes, the relative light emitting duration of the compensation subframes and the corresponding data voltage, a specific example of adjusting according to the distance between the target subframe grayscale and the adjacent original subframe grayscale is as follows. For example, for a certain display grayscale to be compensated, the original sub-frame grayscale (hereinafter referred to as the target sub-frame grayscale) corresponding to the corresponding coordinate point on the test curve corresponding to the target brightness falls between the first original sub-frame grayscale Gray1 and the second original sub-frame grayscale Gray2 (1+Gray1), then the range of the target sub-frame grayscale is determined according to the distance between the brightness corresponding to the target sub-frame grayscale and the first original sub-frame grayscale Gray1, and the distance between the brightness corresponding to the target sub-frame grayscale and the second original sub-frame grayscale Gray2. For example, when the distance between the target sub-frame grayscale and the first original sub-frame grayscale is greater than the distance between the target sub-frame grayscale and the second original sub-frame grayscale Gray2, it can be determined that the target sub-frame grayscale is closer to Gray1, and the range of the target sub-frame grayscale can be determined to be (Gray1, 0.5+Gray1), and then the relative luminous duration range of the compensation sub-frame can be determined by adding a compensation sub-frame. is (0, 0.5), and then the original subframe grayscale is still the data corresponding to the first original subframe grayscale Gray1 (the number of original subframes, the relative luminous duration of the original subframes and the data voltage of the first original subframe grayscale Gray1 in each original subframe are the original subframe data in the target gamma data), and the above-mentioned compensation subframe is added (it can be one or more than one), and the luminous duration of the compensation subframe is adjusted within the above-mentioned relative luminous duration range, and the data voltage of the compensation subframe is controlled to be 1, and the display brightness of the display panel is detected in real time until the difference between the display brightness and the target brightness is less than the set threshold, and the relative luminous duration of the compensation subframe is no longer adjusted. When the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than the set threshold, the number of supplementary subframes, the relative luminous duration and the data voltage of the compensation subframe are the compensation subframe data in the target gamma data. The set threshold can be set in advance in the driver chip that drives the display panel. Figure 4 It is a schematic diagram of sub-frame division for driving a pixel circuit in a display panel within a frame in the prior art; Figure 5 1 is a schematic diagram of sub-frame division for driving a pixel circuit in a display panel within a frame provided by an embodiment of the present invention. Figure 4 and Figure 5 In the figure, the horizontal axis time represents the relative light emission duration, and the vertical axis ROW represents the pixel row in the display panel. Figure 4 and Figure 5 , where Frame represents a frame, F1, F2, F3, and F4 can correspond to the 4 original subframes under the original data bits (4 bits), and F5 is a compensation subframe. After adding the compensation subframe, the data bits become 5 bits, and regardless of the original subframe and the compensation subframe, as the data bits increase, the relative luminous duration increases exponentially. For example, for Figure 4 In the example, the relative luminous duration ratios of the four original subframes F1, F2, F3, F4 and the compensation subframe F5 are 1:2:4:8:16. Figure 5 In the embodiment, the relative luminous duration of the compensation subframe F5 can be continuously adjusted according to the target brightness of the grayscale to be compensated and the actual display brightness of the display panel when the display panel is gamma debugged. When the difference between the adjusted actual debugged brightness and the target brightness of the grayscale to be compensated is less than the set threshold, the relative luminous duration of the compensation subframe, the data voltage of the compensation subframe, and the number of compensation subframes (one when there is only F5) are determined as the compensation subframe data in the target gamma data. Compared with the prior art, the relative luminous duration of the compensation subframe does not necessarily increase exponentially, but can be a smaller relative luminous duration, which is conducive to reducing grayscale redundancy during gamma debugging. In the present embodiment, when performing gamma debugging, compensation subframes are introduced, and the number of compensation subframes and the relative luminous duration can be adjusted according to the target brightness of the grayscale to be compensated, so that the relative luminous duration of the compensation subframe can match the relative luminous duration corresponding to the target brightness of the grayscale to be compensated, that is, in the compensation subframe, the relative luminous duration does not have to increase at an exponential level. Therefore, compared with the prior art of increasing data bits, the method of performing gamma debugging by increasing the luminous duration of different subframes at an exponential level can reduce grayscale redundancy during gamma debugging, thereby improving scanning utilization and improving the problem of insufficient scanning time.

[0056] It should be noted that in order to clearly indicate the relationship between the luminous durations of each subframe, this embodiment and the following embodiments are described using relative luminous durations, wherein the relative luminous duration of the subframe with the shortest luminous duration in the original subframe can be defined as 1.

[0057] The above description only takes the addition of one compensation subframe as an example. More compensation subframes may be added to achieve the target brightness display by controlling the data of the original subframe and combining the duration of the compensation subframe and the data voltage.

[0058] The gamma debugging method of the display panel in this embodiment adjusts at least the compensation sub-frame parameters corresponding to the compensation sub-frame according to the actual test brightness corresponding to the original sub-frame gray level adjacent to the coordinate point of the target brightness of the display gray level to be compensated on the test curve and the target brightness of the display gray level to be compensated. When the difference between the adjusted actual debugging brightness and the target brightness of the display gray level to be compensated is less than the set threshold, the original sub-frame parameters and the compensation sub-frame parameters corresponding to the original sub-frame are determined as the target gamma data of the display gray level to be compensated; furthermore, the display gray levels that need to be compensated can be determined according to the actual test curve of the display panel, and when performing gamma debugging, a compensation sub-frame is introduced, and the number and relative emission duration of the compensation sub-frame can be adjusted according to the target brightness of the display gray level to be compensated, so that the relative emission duration of the compensation sub-frame can match the relative emission duration corresponding to the target brightness of the display gray level to be compensated, that is, in the compensation sub-frame, the relative emission duration does not necessarily increase exponentially. Therefore, compared with the prior art method of increasing the data bits and the emission duration of different sub-frames increasing exponentially for gamma debugging, it is beneficial to reduce the gray level redundancy during gamma debugging, thereby improving the scanning utilization rate and improving the problem of insufficient scanning time. And there is no need to drive the display panel in a digital-analog hybrid driving mode, no complex driving timing, and no high power consumption and increase in the volume of the driving chip.

[0059] Based on the above technical solution, optionally, for the compensation sub-frame located at the m-th bit, the relative emission duration of the compensation sub-frame is less than or equal to 2 m-1 times that of the original sub-frame with the shortest relative emission duration in the original sub-frames, where n < m ≤ n + q, where n represents the number of bits of the original data, q represents the number of compensation sub-frames, and in each compensation sub-frame, at least the relative emission duration of the compensation sub-frame at the i-th bit is less than 2 i-1 times that of the shortest original sub-frame with the shortest relative emission duration in the original sub-frames, where the compensation sub-frame at the i-th bit is any sub-frame among the compensation sub-frames; and the data bits where each compensation sub-frame is located are after the original data bits.

[0060] Specifically, after adding q compensation sub-frames, the number of sub-frames included in one frame is n + q, where n is the number of sub-frames of the original sub-frame. Correspondingly, the number of data bits changes from n bits to n + q bits, and each compensation sub-frame is located at the (n + 1)-th to (n + q)-th bits respectively. In the gamma debugging method of the prior art, for the compensation sub-frame located at the m-th bit, the relative emission duration of the compensation sub-frame is equal to 2 m-1 times that of the shortest original sub-frame with the shortest relative emission duration in the original sub-frames, while in this embodiment, for the compensation sub-frame located at the m-th bit, the relative emission duration of the compensation sub-frame is less than or equal to 2 m-1 times that of the shortest original sub-frame with the shortest relative emission duration in the original sub-frames, and there is a compensation sub-frame at the i-th bit whose relative emission duration is less than 2 i-1times, where \(n < i \leq n + q\). Compared with the prior art, the total relative emission duration of the added compensation sub-frame becomes shorter, which is conducive to reducing the redundancy of gray levels and improving the scanning efficiency.

[0061] Figure 6 is a flowchart of another gamma debugging method for a display panel provided by an embodiment of the present invention. Refer to Figure 6 and the gamma debugging method for the display panel includes:

[0062] Step 111: Determine the coordinate points of the target brightness corresponding to each display gray level on the test curve.

[0063] Specifically, when determining the coordinate points of the target brightness corresponding to a certain display gray level on the test curve, a point with the same brightness as the target brightness can be found on the test curve as the coordinate points of the target brightness corresponding to the display gray level on the test curve. Exemplarily, if the target brightness corresponding to a certain display gray level is 60 nit, then the coordinate point with a brightness of 60 nit found on the test curve is the coordinate point of the target brightness corresponding to the display gray level on the test curve.

[0064] Step 112: Determine whether the original sub-frame gray level corresponding to the coordinate point is an integer. When the original sub-frame gray level corresponding to the coordinate point is not an integer, determine the display gray level of the target brightness at the coordinate point as the display gray level to be compensated.

[0065] After the coordinate points are determined, the range of the target sub-frame gray level corresponding to the coordinate points can be determined. When the target sub-frame gray level corresponding to the coordinate points is not an integer, it cannot be obtained through the data combination of the original sub-frame gray levels under the original data bits, that is, the target brightness cannot be obtained through the data combination of the original sub-frame gray levels. Therefore, when the original sub-frame gray level corresponding to the coordinate points is not an integer, determine the display gray level corresponding to the coordinate points as the display gray level to be compensated, where the display gray level corresponding to the coordinate points is the display gray level with the brightness value of the coordinate points as the target brightness.

[0066] Step 113: Determine whether the original sub-frame gray level corresponding to the coordinate point is greater than the maximum original sub-frame gray level or less than the minimum original sub-frame gray level. If the original sub-frame gray level corresponding to the coordinate point is greater than the maximum original sub-frame gray level or less than the minimum original sub-frame gray level, determine the display gray level of the target brightness at the coordinate point as the display gray level to be compensated.

[0067] Specifically, when the original subframe grayscale corresponding to the coordinate point is greater than the maximum original subframe grayscale or less than the minimum original subframe grayscale, the original subframe grayscale of the coordinate point cannot be reached by the data combination of the original subframe grayscale under the original data position, and therefore the target brightness corresponding to the display grayscale cannot be obtained by the data combination of the original subframe grayscale. Therefore, when the coordinate point corresponds to a grayscale greater than the maximum original subframe grayscale or less than the minimum original subframe grayscale, the display grayscale corresponding to the coordinate point is determined as the display grayscale to be compensated, wherein the display grayscale corresponding to the coordinate point is the display grayscale with the brightness value of the coordinate point as the target brightness.

[0068] Step 121, determining a target sub-frame grayscale corresponding to the display grayscale to be compensated according to the original sub-frame grayscales adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test relationship curve;

[0069] Specifically, the range of the target subframe grayscale can be determined based on the adjacent original subframe grayscales of the coordinate point of the target brightness of the displayed grayscale to be compensated on the test relationship curve. Specifically, the range of the target subframe grayscale can be determined based on the distance between the coordinate point of the target brightness of the displayed grayscale to be compensated on the test relationship curve and the adjacent original subframe grayscales (because the original subframe grayscales are all integers, the adjacent original subframe grayscales are adjacent integer original subframe grayscales).

[0070] Step 122, adjust the data voltage corresponding to the original subframe and the compensation subframe parameters corresponding to the compensation subframe according to the target subframe grayscale, and when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, determine the original subframe parameters and the compensation subframe parameters as the target gamma data of the display grayscale to be compensated.

[0071] After the target subframe grayscale range is determined, not only the number of compensation subframes, the relative luminous duration of the compensation subframes and the data voltage corresponding to the compensation subframes can be adjusted, but also the data voltage corresponding to the original subframe can be adjusted, so that the target subframe grayscale can be approached through the data combination of the original subframe parameters and the compensation subframe parameters, thereby enabling the display panel to achieve the target brightness display.

[0072] It should be noted that, in the present embodiment, step 112 and step 113 are two parallel steps. In other optional embodiments of the present invention, after executing step 111, only step 112 may be executed, and then step 121 and step 122 may be executed; or only step 113 may be executed after executing step 111, and then step 121 and step 122 may be executed; when both step 112 and step 113 are executed after executing step 111, the present embodiment does not specifically limit the execution order of step 112 and step 113, for example, step 112 may be executed first and then step 113, or step 112 may be executed after step 113, or step 112 and step 113 may be executed simultaneously, and after both step 112 and step 113 are executed, step 121 and step 122 are executed.

[0073] Based on the above technical solution, optionally, the maximum number of compensation subframes is 3.

[0074] Too many compensation subframes will still lead to a certain degree of grayscale redundancy, so the maximum number of compensation subframes is set to 3 to ensure that the brightness of each grayscale can be displayed during gamma debugging, while reducing grayscale redundancy and ensuring that the display panel has a high scanning efficiency. Optionally, the relative luminous duration of the compensation subframe is not equal to the relative luminous duration of each original subframe, so that the target brightness can be displayed more easily by combining the data of the original subframe and the compensation subframe.

[0075] Optionally, the number of compensation subframes is 2, the relative luminous duration of one compensation subframe is less than the minimum relative luminous duration of the original subframe, and the relative luminous duration of the other compensation subframe is greater than the relative luminous duration of the set original subframe, and the original subframe is set to any subframe among the original subframes.

[0076] Specifically, when the number of compensation subframes is 2, the relative luminous durations of the two compensation subframes can be different, wherein the relative luminous duration of one compensation subframe can be shorter, and the relative luminous duration of the other compensation subframe can be longer. Further, when the target brightness is slightly different from the grayscale of the adjacent original subframe at the coordinate point on the test curve, the combination of the compensation subframe with a smaller relative luminous duration and the original subframe (at this time, the data voltage corresponding to the compensation subframe with a smaller relative luminous duration needs to be controlled to be 1) can be used to realize the display of the target brightness. When the target brightness is slightly different from the grayscale of the adjacent original subframe at the coordinate point on the test curve, the combination of the compensation subframe with a larger relative luminous duration and the original subframe (at this time, the data voltage corresponding to the compensation subframe with a larger relative luminous duration needs to be controlled to be 1) can be used to realize the display of the target brightness.

[0077] The above embodiments are all applicable to gamma debugging of the display panel as a whole. Due to uncontrollable factors in the process, individual sub-pixels may be defective, resulting in a difference in display brightness between the individual sub-pixels and most other sub-pixels, causing mura. After gamma debugging of the whole, it is also necessary to demura the individual sub-pixels with defects so that the display panel can achieve a better display effect. Figure 7 is a flowchart of another gamma adjustment method for a display panel provided by an embodiment of the present invention, referring to Figure 7 , the gamma debugging method of the display panel includes:

[0078] Step 210: Determine the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale; wherein the test curve is a curve of the relationship between the original subframe grayscale corresponding to the luminous duration corresponding to different data combinations under the original data bit and the actual test brightness, and the original subframe grayscale is an integer. This step 210 is the same as the process of step 110 in the above embodiment, and will not be repeated here.

[0079] Step 220, add the original subframe to a frame, adjust at least the compensation subframe parameters corresponding to the compensation subframe according to the target brightness of the grayscale to be compensated at the coordinate point of the original subframe adjacent to the coordinate point on the test curve, and when the difference between the adjusted actual debugging brightness and the target brightness of the grayscale to be compensated is less than the set threshold, determine the original subframe parameters and compensation subframe parameters corresponding to the original subframe at the grayscale to be compensated as the target gamma data of the grayscale to be compensated. This step 220 is the same as the process of step 120 in the above embodiment, and will not be repeated here.

[0080] Step 230, determining the sub-pixel to be compensated according to the brightness difference of each sub-pixel of the same color at a preset gray scale;

[0081] Specifically, the brightness of each pixel color sub-pixel in the display panel can be obtained through a brightness acquisition instrument, such as a CCD camera, and then the brightness difference between different sub-pixels can be determined. When determining the sub-pixel to be compensated, the sub-pixel whose brightness is significantly lower than the brightness of most sub-pixels in the display panel under a preset gray scale can be determined as the sub-pixel to be compensated, or the sub-pixel whose brightness is significantly higher than the brightness of most sub-pixels in the display panel can be determined as the sub-pixel to be compensated.

[0082] Step 240, according to the brightness of the sub-pixel to be compensated and other sub-pixels under the same detection grayscale, adjust the data voltage corresponding to the sub-pixel in the original sub-frame and the compensation sub-frame parameters corresponding to the compensation sub-frame; when the difference between the adjusted actual debugging brightness of the sub-pixel to be compensated and the brightness of other sub-pixels is less than a set threshold, determine the original sub-frame parameters and the compensation sub-frame parameters corresponding to the sub-pixel to be compensated under the detection grayscale as the updated target gamma data of the sub-pixel to be compensated under the detection grayscale.

[0083] Specifically, after the above step 220 is completed, the target gamma data corresponding to the sub-pixels of the same color in the display panel at a display grayscale to be compensated are all equal. In this step, the data voltage corresponding to the sub-pixel in the original sub-frame, the number of compensation sub-frames, the relative luminous duration of the compensation sub-frame, and the data voltage corresponding to the compensation sub-frame are adjusted according to the brightness difference between the sub-pixel to be compensated and other sub-pixels at the same detection grayscale, so that the difference between the adjusted actual debugging brightness of the sub-pixel to be compensated and the brightness of other sub-pixels is less than the set threshold, and when the difference between the adjusted actual debugging brightness of the sub-pixel to be compensated and the brightness of other sub-pixels is less than the set threshold, the data voltage corresponding to the original sub-frame and the data voltage corresponding to the compensation sub-frame are determined as the updated target gamma data of the sub-pixel to be compensated at the detection grayscale. When the detection grayscale is equal to the display grayscale to be compensated, the target gamma data of the sub-pixel to be compensated (the same gamma data of each sub-pixel of the same color obtained in step 220) can be updated with the updated target gamma data, thereby improving the mura phenomenon of the display panel.

[0084] The preset grayscale in step 230 and the detected grayscale in step 240 both refer to display grayscale.

[0085] Based on the above technical solution, optionally, after step 230, the following further steps are included:

[0086] Determine the compensation parameter corresponding to the sub-pixel to be compensated according to the brightness of the sub-pixel to be compensated and other sub-pixels under different display grayscales; after the above step 240, it also includes: establishing a corresponding relationship between the compensation parameter of the sub-pixel to be compensated and the updated target gamma data.

[0087] In this step, the brightness of the sub-pixel to be compensated and other sub-pixels under at least two different display grayscales needs to be obtained, and optionally, the brightness of the sub-pixel to be compensated and other sub-pixels under three different display grayscales need to be obtained. Exemplarily, the compensation function of the actual display grayscale corresponding to the target grayscale and the brightness of the sub-pixel to be compensated can be determined according to the brightness of the sub-pixel to be compensated and the brightness of other sub-pixels under different display grayscales. Exemplarily, when the compensation function is Y=AX+B, A and B are compensation parameters; when the compensation function is Y=AX 2 +BX+C, A, B, C are compensation parameters; where Y in the compensation function represents the target grayscale of the sub-pixel to be compensated, and X represents the actual display grayscale of the sub-pixel to be compensated. After the compensation parameters are determined, a mapping relationship between the compensation parameters of the sub-pixel to be compensated and the updated target gamma data can be established, and then in the subsequent normal display process after gamma debugging, the display panel is driven to display according to the mapping relationship.

[0088] The embodiment of the present invention further provides a gamma adjustment device for a display panel. Figure 8is a schematic diagram of the structure of a gamma adjustment device for a display panel provided by an embodiment of the present invention, with reference to Figure 8 , the gamma debugging device of the display panel comprises:

[0089] The display grayscale determination module 310 to be compensated is used to determine the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale; wherein the test curve is a relationship curve between the original subframe grayscale corresponding to different relative luminous durations under the original data bit and the actual test brightness, and the original subframe grayscales are all integers;

[0090] The target gamma data determination module 320 is used to add a compensation subframe in a frame, and at least adjust the compensation subframe parameters corresponding to the compensation subframe according to the original subframe grayscale adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve; when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, the original subframe parameters and the compensation subframe parameters corresponding to the original subframe at the display grayscale to be compensated are determined as the target gamma data of the display grayscale to be compensated; wherein the original subframe parameters include the number of original subframes, the relative luminous duration of the original subframes and the data voltage corresponding to the original subframes; the compensation subframe parameters include the number of compensation subframes, the relative luminous duration of the compensation subframes and the data voltage corresponding to the compensation subframes.

[0091] The gamma debugging device for a display panel of this embodiment can be used to execute the gamma debugging method for a display panel provided by any of the above embodiments of the present invention, and has the same technical effect as the gamma debugging method for a display panel in the above embodiments.

[0092] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A gamma adjustment method for a display panel, characterized in that: include: Determine the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale; wherein the test curve is a relationship curve between the original subframe grayscale corresponding to different relative luminous durations under the original data bit and the actual test brightness, and the original subframe grayscales are all integers; Add a compensation subframe in a frame, adjust at least the compensation subframe parameters corresponding to the compensation subframe according to the target brightness of the display grayscale to be compensated, and when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, determine the original subframe parameters corresponding to the original subframe and the compensation subframe parameters at the display grayscale to be compensated as the target gamma data of the display grayscale to be compensated; The original subframe parameters include the number of original subframes, the relative luminous duration of the original subframes, and the data voltage corresponding to the original subframes; the compensation subframe parameters include the number of compensation subframes, the relative luminous duration of the compensation subframes, and the data voltage corresponding to the compensation subframes; For the compensation sub-frame located at the m-th position, the relative light-emitting duration of the compensation sub-frame is less than or equal to 2 times that of the original sub-frame with the shortest relative light-emitting duration in the original sub-frames, where n < m ≤ n + q, n represents the number of bits of the original data bits, q represents the number of compensation sub-frames, and in each of the compensation sub-frames, at least the relative light-emitting duration of the compensation sub-frame at the i-th position is less than 2 times that of the shortest original sub-frame with the shortest relative light-emitting duration in the original sub-frames, where the compensation sub-frame at the i-th position is any one of the compensation sub-frames; m-1 times, where n < m ≤ n + q, n represents the number of bits of the original data bits, q represents the number of compensation sub-frames, and in each of the compensation sub-frames, at least the relative light-emitting duration of the compensation sub-frame at the i-th position is less than 2 times that of the shortest original sub-frame with the shortest relative light-emitting duration in the original sub-frames; i-1 times, where the compensation sub-frame at the i-th position is any one of the compensation sub-frames; The data bits where the compensation subframes are located are located after the original data bits.

2. The gamma adjustment method of a display panel according to claim 1, characterized in that: Determine the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale, including: Determine the coordinate point of the target brightness corresponding to each of the display grayscales on the test curve; It is determined whether the original subframe grayscale corresponding to the coordinate point is an integer. When the original subframe grayscale corresponding to the coordinate point is not an integer, the display grayscale of the target brightness at the coordinate point is determined as the display grayscale to be compensated.

3. The gamma adjustment method of a display panel according to claim 1, characterized in that: Determining the display grayscale to be compensated according to the test curve and the target brightness corresponding to the display grayscale, further comprising: Determine whether the original subframe grayscale corresponding to the coordinate point is greater than the maximum original subframe grayscale or less than the minimum original subframe grayscale; if the original subframe grayscale corresponding to the coordinate point is greater than the maximum original subframe grayscale or less than the minimum original subframe grayscale, determine the display grayscale of the target brightness at the coordinate point as the display grayscale to be compensated.

4. The gamma adjustment method of a display panel according to claim 1, characterized in that: The method of adding a compensation subframe to a frame, adjusting at least a compensation subframe parameter corresponding to the compensation subframe at an original subframe grayscale adjacent to a coordinate point on the test curve according to the target brightness of the display grayscale to be compensated, and determining the corresponding original subframe parameter of the original subframe and the compensation subframe parameter at the display grayscale to be compensated as target gamma data of the display grayscale to be compensated when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, comprises: Determine the target subframe grayscale corresponding to the display grayscale to be compensated according to the original subframe grayscales adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve; The data voltage corresponding to the original subframe and the compensation subframe parameters corresponding to the compensation subframe are adjusted according to the target subframe grayscale. When the difference between the actual debugging brightness after adjustment and the target brightness of the display grayscale to be compensated is less than a set threshold, the original subframe parameters and the compensation subframe parameters are determined as the target gamma data of the display grayscale to be compensated.

5. The gamma adjustment method of a display panel according to claim 1, characterized in that: The maximum number of the compensation subframes is 3.

6. The gamma adjustment method of a display panel according to claim 5, characterized in that: The number of compensation subframes is 2, wherein the relative luminous duration of one compensation subframe is less than the minimum relative luminous duration of the original subframe, and the relative luminous duration of the other compensation subframe is greater than the relative luminous duration of the set original subframe, wherein the set original subframe is any subframe among the original subframes.

7. The gamma adjustment method of a display panel according to claim 1, characterized in that: The method further comprises: adding a compensation subframe to a frame, adjusting at least a compensation subframe parameter corresponding to the compensation subframe according to the actual test brightness corresponding to the original subframe grayscale adjacent to the coordinate point of the target brightness of the display grayscale to be compensated on the test curve and the target brightness of the display grayscale to be compensated, and when the difference between the adjusted actual test brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, determining the original subframe parameter corresponding to the original subframe and the compensation subframe parameter as the target gamma data of the display grayscale to be compensated, and further comprising: Determine the sub-pixel to be compensated according to the brightness difference of each sub-pixel of the same color at a preset gray scale; The data voltage corresponding to the sub-pixel in the original sub-frame and the compensation sub-frame parameters corresponding to the compensation sub-frame are adjusted according to the brightness difference between the sub-pixel to be compensated and other sub-pixels at the same detection grayscale; when the difference between the adjusted actual debugging brightness of the sub-pixel to be compensated and the brightness of other sub-pixels is less than a set threshold, the original sub-frame parameters and the compensation sub-frame parameters corresponding to the sub-pixel to be compensated at the detection grayscale are determined as the updated target gamma data of the sub-pixel to be compensated at the detection grayscale.

8. The gamma adjustment method of a display panel according to claim 7, characterized in that: After determining the sub-pixel to be compensated according to the brightness difference of each sub-pixel of the same color under the preset gray scale, the method further includes: Determine a compensation parameter corresponding to the sub-pixel to be compensated according to the brightness of the sub-pixel to be compensated and the brightness of other sub-pixels under different display grayscales; After determining the updated target gamma data of the sub-pixel to be compensated at the detected grayscale, the method further includes: A corresponding relationship between the compensation parameter of the sub-pixel to be compensated and the updated target gamma data is established.

9. A gamma adjustment device for a display panel, characterized in that: include: A display grayscale determination module to be compensated is used to determine the display grayscale to be compensated according to a test curve and a target brightness corresponding to the display grayscale; wherein the test curve is a relationship curve between the original subframe grayscale corresponding to different relative luminous durations under the original data bit and the actual test brightness, and the original subframe grayscales are all integers; A target gamma data determination module, for adding a compensation subframe in a frame, adjusting at least the compensation subframe parameters corresponding to the compensation subframe at the original subframe grayscale adjacent to the coordinate point on the test curve according to the target brightness of the display grayscale to be compensated, and when the difference between the adjusted actual debugging brightness and the target brightness of the display grayscale to be compensated is less than a set threshold, determining the original subframe parameters corresponding to the original subframe and the compensation subframe parameters at the display grayscale to be compensated as the target gamma data of the display grayscale to be compensated; wherein the original subframe parameters include the number of original subframes, the relative luminous duration of the original subframes and the data voltage corresponding to the original subframes; and the compensation subframe parameters include the number of compensation subframes, the relative luminous duration of the compensation subframes and the data voltage corresponding to the compensation subframes; Among them, for the compensation sub-frame located at the m-th position, the relative light-emitting duration of the compensation sub-frame is less than or equal to 2 times that of the original sub-frame with the shortest relative light-emitting duration in the original sub-frames, where n < m ≤ n + q, n represents the number of bits of the original data bits, q represents the number of compensation sub-frames, and in each of the compensation sub-frames, at least the relative light-emitting duration of the compensation sub-frame at the i-th position is less than 2 times that of the shortest original sub-frame with the shortest relative light-emitting duration in the original sub-frames, where the compensation sub-frame at the i-th position is any one of the compensation sub-frames; m-1 times, where n < m ≤ n + q, n represents the number of bits of the original data bits, q represents the number of compensation sub-frames, and in each of the compensation sub-frames, at least the relative light-emitting duration of the compensation sub-frame at the i-th position is less than 2 times that of the shortest original sub-frame with the shortest relative light-emitting duration in the original sub-frames; i-1 times, where the compensation sub-frame at the i-th position is any one of the compensation sub-frames; The data bits where the compensation subframes are located are located after the original data bits.

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