Gamma debugging method and gamma debugging device of display panel

Abstract

The application discloses a gamma debugging method and device for a display panel. The gamma debugging method for the display panel comprises the following steps: determining a gamma value of the display panel; wherein the gamma value of the display panel gradually decreases with the increase of a gray scale; and performing gamma debugging on the display panel according to the gamma value. The embodiment of the application can improve the contrast ratio when the display panel displays a picture.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a gamma adjustment method and gamma adjustment device for a display panel. Background Technology

[0002] With the development of display technology, people have higher and higher requirements for the display performance of display panels. However, the existing display panels have low contrast when displaying images, which affects the display effect. Summary of the Invention

[0003] This invention provides a gamma adjustment method and a gamma adjustment device for a display panel to improve the contrast of the displayed image.

[0004] According to one aspect of the present invention, a gamma adjustment method for a display panel is provided, comprising:

[0005] Determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases;

[0006] Perform gamma adjustment on the display panel based on the gamma value.

[0007] Optionally, the gamma value of the display panel decreases in a stepwise manner as the grayscale increases.

[0008] Optionally, the display panel includes a first grayscale range, a second grayscale range, and a third grayscale range, wherein the minimum grayscale of the second grayscale range is greater than the maximum grayscale of the first grayscale range, and the minimum grayscale of the third grayscale range is greater than the maximum grayscale of the second grayscale range.

[0009] The gamma value of the first grayscale range is greater than the gamma value of the second grayscale range, and the gamma value of the second grayscale range is greater than the gamma value of the third grayscale range.

[0010] Optionally, the gamma value used for the second grayscale range is the preset gamma value;

[0011] Optionally, within the first grayscale range, the gamma value of the display panel gradually decreases as the grayscale increases;

[0012] Optionally, in the third grayscale range, the gamma value of the display panel gradually decreases as the grayscale increases;

[0013] Optionally, the average gamma value of all gray levels is the preset gamma value.

[0014] Optionally, the first grayscale range includes multiple first sub-grayscale ranges, with different gamma values ​​used for different first sub-grayscale ranges and the same gamma value used for the same first sub-grayscale range.

[0015] Optionally, the third grayscale range includes multiple second sub-grayscale ranges, with different gamma values ​​used for different second sub-grayscale ranges and the same gamma value used for the same second sub-grayscale range.

[0016] Optionally, the difference in gamma values ​​used for two adjacent first sub-grayscale ranges is the same, and the difference in gamma values ​​used for two adjacent second sub-grayscale ranges is the same.

[0017] Optionally, each of the first sub-grayscale ranges includes the same number of grayscale levels, and each of the second sub-grayscale ranges includes the same number of grayscale levels.

[0018] Optionally, before performing gamma adjustment on the display panel based on the gamma value, the method further includes:

[0019] Determine an auxiliary adjustment factor; wherein the auxiliary adjustment factor is used to adjust the brightness of some gray levels;

[0020] Performing gamma adjustment on the display panel based on the gamma value includes:

[0021] The display panel is gamma-adjusted based on the gamma value and the auxiliary adjustment factor.

[0022] Optionally, the auxiliary adjustment factor is used to adjust the brightness of at least a portion of the transition gray levels; wherein, the transition gray level is an adjacent gray level in two adjacent sub-gray level ranges with different gamma values ​​or an adjacent gray level in two adjacent gray level ranges with different gamma values.

[0023] Optionally, at least some transition gray levels correspond to different auxiliary adjustment factors.

[0024] Optionally, when the display panel includes a first grayscale range, a second grayscale range, and a third grayscale range, the auxiliary adjustment factor is used to reduce the brightness of some grayscale levels in the first grayscale range and increase the brightness of some grayscale levels in the third grayscale range.

[0025] Optionally, gamma adjustment of the display panel is performed based on the gamma value and the auxiliary adjustment factor, including:

[0026] The adjusted gamma formula is determined based on the gamma value and the auxiliary adjustment factor.

[0027] Perform gamma adjustment on the display panel according to the adjusted gamma formula;

[0028] The adjusted gamma formula includes:

[0029]

[0030] Where γ is the gamma value, G x For grayscale, Gmax L represents the maximum grayscale value of the display panel. x For G x The corresponding brightness, L max For G max The corresponding brightness, M and N are auxiliary adjustment factors, G1 is the first preset gray level, G2 is the second preset gray level, and G2 is greater than or equal to G1.

[0031] Optionally, gamma adjustment of the display panel is performed according to the adjusted gamma formula, including:

[0032] The target brightness of multiple binding point gray levels is determined based on the adjusted gamma formula;

[0033] The display panel is adjusted according to the target brightness to determine the driving data corresponding to the grayscale of the bound point;

[0034] Optionally, the display panel is adjusted according to the target brightness to determine the driving data corresponding to the grayscale of the bound dots, including:

[0035] Input the initial driving data corresponding to the grayscale of the binding point into the display panel;

[0036] Obtain the measured brightness of the display panel;

[0037] The driving data input to the display panel is adjusted based on the difference between the measured brightness and the target brightness. After each adjustment of the driving data, the measured brightness of the display panel is re-acquired until the difference between the measured brightness and the target brightness is less than a preset brightness threshold.

[0038] According to another aspect of the present invention, a gamma adjustment device for a display panel is provided, comprising:

[0039] A gamma determination module is used to determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases;

[0040] The gamma adjustment module is used to perform gamma adjustment on the display panel based on the gamma value.

[0041] The gamma adjustment method provided in this invention adjusts the display panel's gamma value to gradually decrease as the grayscale level increases. This results in a higher gamma value for lower grayscale levels and a lower gamma value for higher grayscale levels, thereby increasing the brightness difference between high and low grayscale levels and improving the contrast of the displayed image. Furthermore, the solution implemented in this invention does not cause the overall image to be too bright or too dark, fundamentally improving the actual contrast of the image. It is applicable to all display panels, requires no complex algorithms, and does not increase the cost of the display panel.

[0042] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a gamma debugging method for a display panel provided in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of a gamma curve provided in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of a low grayscale gamma curve provided in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of a high grayscale gamma curve provided in an embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of a gamma debugging method for a display panel provided in an embodiment of the present invention;

[0049] Figure 6 This is a flowchart of another gamma debugging method for a display panel provided in an embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of a gamma debugging device for a display panel provided in an embodiment of the present invention. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] As mentioned in the background section, existing display panels exhibit low contrast, impacting display quality. The inventors discovered that this issue stems from the fact that current display panel gamma calibration largely relies on gamma formulas, aiming for a gamma value of 2.2. This method lacks flexibility, particularly noticeable in high-brightness environments where contrast is significantly insufficient. Related technologies that adjust gamma values ​​across the entire spectrum towards a single target to improve contrast in lighting conditions can lead to overly bright or dark images, failing to fundamentally address the actual contrast problem. Furthermore, some display panels enhance contrast by incorporating High Dynamic Range (HDR) functionality. While effective, this approach is costly and computationally complex, requiring the display panel to support higher color gamuts and depths, as well as dedicated algorithm IPs on the driver board. This limitation applies only to certain display panels and cannot resolve the low contrast issue prevalent in most displays.

[0054] Based on this, embodiments of the present invention provide a gamma adjustment method for a display panel. Figure 1 This is a schematic diagram of a gamma debugging method for a display panel provided in an embodiment of the present invention. (Refer to...) Figure 1 The gamma adjustment methods for the display panel include:

[0055] S110. Determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases.

[0056] Among them, as the gray level increases, the gamma value of the display panel gradually decreases. This can be a linear decrease in the gamma value of the display panel as the gray level increases, a step-like decrease in the gamma value of the display panel as the gray level increases, a linear decrease in the gamma value corresponding to some gray levels and a step-like decrease in the gamma value corresponding to some gray levels, or a curve-like decrease in the gamma value of the display panel as the gray level increases.

[0057] The gamma formula is γ is the gamma value, G x For grayscale, G max L represents the maximum grayscale value of the display panel. x For G x The corresponding brightness, L max For G max The corresponding brightness. The maximum grayscale and maximum brightness (the brightness corresponding to the maximum grayscale) of the display panel can be predetermined according to the panel requirements. After the maximum grayscale and maximum brightness of the display panel are determined, the brightness of each grayscale can be determined using the gamma formula. Different gamma values ​​result in different brightness values ​​determined by the gamma formula. The larger the gamma value, the smaller the brightness corresponding to the same grayscale determined by the gamma formula; conversely, the smaller the gamma value, the larger the brightness corresponding to the same grayscale determined by the gamma formula.

[0058] Specifically, when the entire display panel uses the same gamma value, the brightness of the display panel gradually increases as the grayscale increases. By setting the gamma value to gradually decrease as the grayscale increases, the lower the grayscale, the larger the gamma value, and the higher the grayscale, the smaller the gamma value. This results in the brightness of high grayscale being increased compared to using the same gamma value, and the brightness of low grayscale being decreased compared to using the same gamma value. The brightness difference between high and low grayscale is increased, thus improving the contrast of the display panel when displaying the image.

[0059] S120. Perform gamma adjustment on the display panel based on the gamma value.

[0060] Specifically, the target brightness corresponding to each grayscale level can be determined based on the gamma value and gamma formula. Taking a single grayscale level as an example, when performing gamma adjustment on a display panel, first input the initial driving data corresponding to that grayscale level into the display panel, measure the actual brightness of the display panel, adjust the initial driving data based on the difference between the actual brightness and the target brightness, input the adjusted driving data into the display panel, and measure the actual brightness of the display panel again until the difference between the actual brightness and the target brightness is less than a preset threshold. The last driving data input into the display panel is then used as the driving data corresponding to that grayscale level. This process is repeated for each grayscale level to determine the corresponding driving data, thus completing the gamma adjustment.

[0061] The gamma adjustment method provided in this invention adjusts the display panel's gamma value to gradually decrease as the grayscale level increases. This results in a higher gamma value for lower grayscale levels and a lower gamma value for higher grayscale levels, thereby increasing the brightness difference between high and low grayscale levels and improving the contrast of the displayed image. Furthermore, the solution implemented in this invention does not cause the overall image to be too bright or too dark, fundamentally improving the actual contrast of the image. It is applicable to all display panels, requires no complex algorithms, and does not increase the cost of the display panel.

[0062] Based on the above embodiments, optionally, the gamma value of the display panel decreases in a stepwise manner as the grayscale increases.

[0063] In this process, the gamma value of the display panel decreases in a stepwise manner as the gray level increases. For example, the display panel may include multiple gray level ranges, each with the same gamma value, but different gamma values ​​for different gray level ranges. Along the direction of increasing gray level, the gamma value corresponding to each gray level range decreases sequentially.

[0064] By setting the gamma value of the display panel to decrease in a stepwise manner as the grayscale increases, the brightness difference between high and low grayscale levels is increased, thereby improving the contrast of the display panel when displaying the image. At the same time, the difficulty of gamma adjustment can be reduced and the adjustment efficiency can be improved.

[0065] Based on the above embodiments, optionally, the display panel includes a first grayscale range, a second grayscale range and a third grayscale range, wherein the minimum grayscale of the second grayscale range is greater than the maximum grayscale of the first grayscale range, and the minimum grayscale of the third grayscale range is greater than the maximum grayscale of the second grayscale range.

[0066] The gamma value of the first grayscale range is greater than the gamma value of the second grayscale range, and the gamma value of the second grayscale range is greater than the gamma value of the third grayscale range.

[0067] The first grayscale range can be the low grayscale range of the display panel, and the third grayscale range can be the high grayscale range of the display panel. The maximum grayscale level in the first grayscale range is 'a', and the minimum grayscale level in the third grayscale range is 'b'. When the maximum grayscale level of the display panel is 255, 'a' can be a grayscale level less than 127, and 'b' can be a grayscale level greater than 127, for example, a = 120, b = 130, or a = 126, b = 128, etc.

[0068] The gamma value of the first grayscale range is greater than that of the second grayscale range, and the gamma value of the second grayscale range is greater than that of the third grayscale range. This results in the largest gamma value in the first grayscale range (which has lower grayscale levels), leading to lower brightness. Conversely, the smallest gamma value in the third grayscale range (which has higher grayscale levels) leads to higher brightness. This increases the brightness difference between low and high grayscale levels, thereby improving the contrast of the display panel when showing the image.

[0069] Based on the above embodiments, optionally, the gamma value used for the second grayscale range is a preset gamma value.

[0070] This means that all gray levels within the second grayscale range use the same gamma value, i.e., the preset gamma value. The preset gamma value can be the gamma value that the display panel needs to meet. The gamma value of the first grayscale range is greater than the preset gamma value, and the gamma value of the third grayscale range is less than the preset gamma value, so that the average gamma value of all grayscale levels of the display panel is close to or equal to the preset gamma value. This ensures that while improving the contrast of the displayed image, the average gamma of the display panel across all grayscale levels meets the requirements.

[0071] Based on the above embodiments, optionally, within the first grayscale range, the gamma value of the display panel gradually decreases as the grayscale increases.

[0072] This setting results in higher gamma values ​​and lower brightness at lower gray levels within the first grayscale range, further improving the contrast of the displayed image. Simultaneously, by further adjusting the gamma values ​​of each gray level within the first grayscale range, the brightness of each gray level within that range can be flexibly adjusted, making the brightness of each gray level better meet the contrast requirements and other display requirements of the display panel, thus further enhancing the display effect.

[0073] Based on the above embodiments, optionally, in the third grayscale range, the gamma value of the display panel gradually decreases as the grayscale increases.

[0074] This setting results in smaller gamma values ​​and greater brightness at higher gray levels within the third grayscale range, further improving the contrast of the displayed image. Simultaneously, by further adjusting the gamma values ​​of each gray level within the third grayscale range, the brightness of each gray level can be flexibly adjusted, making the brightness of each gray level better meet the contrast requirements and other display requirements of the display panel, thereby further enhancing the display effect.

[0075] Based on the above embodiments, optionally, the average gamma value of all gray levels is a preset gamma value, so that while improving the contrast of the display panel, the average gamma of the display panel across all gray levels meets the requirements.

[0076] Based on the above embodiments, optionally, the first grayscale range includes multiple first sub-grayscale ranges, with different gamma values ​​used for different first sub-grayscale ranges, and the same gamma value used for the same first sub-grayscale range.

[0077] Specifically, multiple gray levels within the same first sub-grayscale range use the same gamma value. During gamma adjustment, one or more bound-point gray levels can be selected within the same first sub-grayscale range for adjustment, eliminating the need to adjust all gray levels. By further dividing the first grayscale range into multiple first sub-grayscale ranges, the gamma values ​​of these ranges gradually decrease. This ensures high contrast on the display panel while reducing the number of gray levels required for gamma adjustment and shortening the adjustment time.

[0078] It should be noted that each first sub-grayscale range can include more than one grayscale level. The number of grayscale levels in different first sub-grayscale ranges can be the same or different. The difference in gamma value between adjacent first sub-grayscale ranges can be the same or different. The specific settings can be made according to the brightness requirements.

[0079] Based on the above embodiments, optionally, the third grayscale range includes multiple second sub-grayscale ranges, with different gamma values ​​used for different second sub-grayscale ranges and the same gamma value used for the same second sub-grayscale range.

[0080] Specifically, multiple gray levels within the same second sub-grayscale range use the same gamma value. During gamma adjustment, one or more bound-point gray levels can be selected within the same second sub-grayscale range for adjustment, eliminating the need to adjust all gray levels. By further dividing the third grayscale range into multiple second sub-grayscale ranges, the gamma values ​​of these ranges gradually decrease. This ensures high contrast on the display panel while reducing the number of gray levels required for gamma adjustment and shortening the adjustment time.

[0081] It should be noted that each second sub-grayscale range can include more than one grayscale level. The number of grayscale levels in different second sub-grayscale ranges can be the same or different. The difference in gamma value between adjacent second sub-grayscale ranges can be the same or different. The specific settings can be made according to the brightness requirements.

[0082] Based on the above embodiments, optionally, the difference in gamma values ​​used for two adjacent first sub-grayscale ranges is the same.

[0083] This setting ensures that the gamma values ​​of adjacent first sub-grayscale ranges change in the same way, and the brightness changes of adjacent first sub-grayscale ranges are similar, resulting in a smooth transition of brightness between each grayscale level within the first grayscale range. This guarantees that the display panel has a good display effect and optimizes the display effect perceived by the human eye.

[0084] Optionally, two adjacent second sub-grayscale ranges may use the same difference in gamma values.

[0085] This setting ensures that the gamma values ​​of adjacent second sub-grayscale ranges change in the same way, and the brightness changes of adjacent second sub-grayscale ranges are similar, resulting in a smooth transition of brightness between each grayscale level within the third grayscale range. This guarantees that the display panel has a good display effect and optimizes the display effect perceived by the human eye.

[0086] Based on the above embodiments, optionally, each first sub-grayscale range includes the same number of grayscale levels, and each second sub-grayscale range includes the same number of grayscale levels.

[0087] This setting ensures that the gamma value changes uniformly with the grayscale, resulting in a smoother transition between grayscale levels, guaranteeing a better display effect for the display panel, and optimizing the display effect perceived by the human eye.

[0088] Figure 2 This is a schematic diagram of a gamma curve provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of a low grayscale gamma curve provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of a high grayscale gamma curve provided in an embodiment of the present invention. (Reference) Figures 2-4 The gamma value of grayscale 127 is 2.2. The gamma value is set to increase by 0.01 every three grayscale levels from 126 to 0, and decrease by 0.01 every three grayscale levels from 128 to 255. That is, the gamma value for grayscale 126-124 is 2.21, for 123-121 it is 2.22, ..., for 128-130 it is 2.19, for 131-133 it is 2.18, ... Figure 2 This is a schematic diagram of the γ curve using the above gamma value and the γ curve using a gray level of 2.2 for all gray levels. Figure 2 The orange curve is the traditional gamma curve with a gamma value of 2.2, while the green curve is the gamma curve of this embodiment. Figure 3 yes Figure 2 A schematic diagram of the low grayscale portion of the two γ curves. Figure 3 The orange curve is the low grayscale gamma curve in this embodiment. Figure 4 yes Figure 2 A schematic diagram of the high grayscale portion of the two γ curves. Figure 4 The orange curve is the high grayscale gamma curve in this embodiment. (Reference) Figures 2-4 As can be seen, the solution in this embodiment has a greater brightness difference between low and high gray levels compared to the traditional γ curve with a gamma value of 2.2, resulting in higher contrast.

[0089] This implementation optimizes the above embodiments. Specifically, before performing gamma adjustment on the display panel based on the gamma value, the following is added: determining an auxiliary adjustment factor; wherein the auxiliary adjustment factor is used to adjust the brightness of some gray levels. The gamma adjustment of the display panel based on the gamma value is optimized to: performing gamma adjustment on the display panel based on both the gamma value and the auxiliary adjustment factor. Figure 5 This is a schematic diagram of a gamma debugging method for a display panel provided in an embodiment of the present invention, for reference. Figure 5 The optimized gamma debugging method for the display panel includes:

[0090] S110. Determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases.

[0091] S111. Determine the auxiliary adjustment factor; wherein, the auxiliary adjustment factor is used to adjust the brightness of some gray levels.

[0092] Specifically, if, after determining the gamma value, the brightness of some grayscale levels still fails to meet the contrast requirements, or the brightness transition of some grayscale levels is not smooth, the brightness of these grayscale levels can be adjusted using an auxiliary adjustment factor. The auxiliary adjustment factors corresponding to the grayscale levels that need adjustment can be the same or different.

[0093] S121. Perform gamma adjustment on the display panel based on the gamma value and auxiliary adjustment factor.

[0094] Specifically, the gamma formula can be adjusted using an auxiliary adjustment factor to determine the adjusted gamma formula. The target brightness for each grayscale level can then be determined based on the adjusted gamma formula. Alternatively, the target brightness for each grayscale level can be directly calculated using the gamma value and the gamma formula. Then, the target brightness for the grayscale levels requiring brightness adjustment is adjusted using an auxiliary adjustment factor to determine the final target brightness for each grayscale level. Finally, the driving data input to the display panel is adjusted based on the target brightness so that when displaying each grayscale level, the difference between the actual brightness displayed by the display panel under the driving data and the target brightness is less than a set brightness threshold.

[0095] In this embodiment of the invention, by setting an auxiliary adjustment factor, after adjusting the brightness of each gray level through the gamma value, the brightness of some gray levels is further adjusted through the auxiliary adjustment factor, so as to further ensure that the brightness of each gray level meets the contrast requirements and further improve the matching between the display effect of the display panel and human eye perception.

[0096] Based on the above embodiments, optionally, an auxiliary adjustment factor is used to adjust the brightness of at least some transition gray levels; wherein, the transition gray level is an adjacent gray level in two adjacent sub-gray level ranges with different gamma values ​​or an adjacent gray level in two adjacent gray level ranges with different gamma values.

[0097] In this context, if the first and second grayscale ranges are two adjacent grayscale ranges with different gamma values, then the adjacent grayscale levels within the first and second grayscale ranges are considered transitional grayscale levels. Similarly, if the second and third grayscale ranges are two adjacent grayscale ranges with different gamma values, then the adjacent grayscale levels within the second and third grayscale ranges are considered transitional grayscale levels. If adjacent first sub-grayscale ranges have different gamma values, then the adjacent grayscale levels within the two adjacent first sub-grayscale ranges are considered transitional grayscale levels. Similarly, if adjacent second sub-grayscale ranges have different gamma values, then the adjacent grayscale levels within the two adjacent second sub-grayscale ranges are considered transitional grayscale levels.

[0098] Two adjacent grayscale ranges with different gamma values ​​can have a transition grayscale level set in only one grayscale range, or both grayscale ranges can have a transition grayscale level set. A grayscale range can include one, two, or more transition grayscale levels. For example, the first grayscale range is 0 to a, and the second grayscale range is a+1 to b-1. The grayscale levels adjacent to the first grayscale range and the second grayscale range (i.e., transition grayscale levels) can include a, a-1, a-2, etc. If grayscale levels a, a-1, a-2, etc. all require brightness adjustment, then each of grayscale levels a, a-1, a-2 uses an auxiliary adjustment factor to adjust its brightness. Similarly, two adjacent sub-grayscale ranges can have a transition grayscale level set in only one sub-grayscale range, or both sub-grayscale ranges can have a transition grayscale level set. A sub-grayscale range can include one, two, or more transition grayscale levels.

[0099] By using an auxiliary adjustment factor to adjust the brightness of some transition gray levels, the brightness transition between adjacent sub-gray level ranges and between adjacent gray level ranges is smoother, ensuring that the display panel has a better display effect and optimizing the display effect perceived by the human eye.

[0100] Based on the above embodiments, optionally, at least some transition gray levels correspond to different auxiliary adjustment factors.

[0101] This setting allows the auxiliary adjustment factor to specifically adjust the brightness of each transition gray level, ensuring that the brightness of each transition gray level meets the requirements, and making the brightness transition between adjacent sub-gray level ranges and adjacent gray level ranges smoother.

[0102] Based on the above embodiments, optionally, when the display panel includes a first grayscale range, a second grayscale range, and a third grayscale range, the auxiliary adjustment factor is used to reduce the brightness of some grayscale levels in the first grayscale range and increase the brightness of some grayscale levels in the third grayscale range.

[0103] Specifically, the auxiliary adjustment factor can also adjust the brightness of non-transition gray levels in the first and second gray level ranges to improve the contrast between low and high gray levels.

[0104] This embodiment is optimized on the basis of the above embodiments, specifically, the performing gamma debugging on the display panel according to the gamma value and the auxiliary adjustment factor is optimized as: determining an adjusted gamma formula according to the gamma value and the auxiliary adjustment factor; performing gamma debugging on the display panel according to the adjusted gamma formula; wherein the adjusted gamma formula includes: wherein γ is the gamma value, G x is the gray scale, G max is the maximum gray scale of the display panel, L x is the brightness corresponding to G x , L max is the brightness corresponding to G max , M and N are auxiliary adjustment factors, G1 is a first preset gray scale, G2 is a second preset gray scale, and G2 is greater than or equal to G1. Figure 6 is a flowchart of still another gamma debugging method for a display panel provided in the embodiments of the present invention, with reference to Figure 6 , the optimized gamma debugging method for a display panel includes:

[0105] S110: Determine a gamma value of a display panel; wherein as the gray scale increases, the gamma value of the display panel gradually decreases.

[0106] S111: Determine an auxiliary adjustment factor; wherein the auxiliary adjustment factor is configured to adjust the brightness of partial gray scales.

[0107] S1211: Determine an adjusted gamma formula according to the gamma value and the auxiliary adjustment factor.

[0108] wherein the adjusted gamma formula includes:

[0109]

[0110] wherein γ is the gamma value, G x is the gray scale, G max is the maximum gray scale of the display panel, L x is the brightness corresponding to G x , L max is the brightness corresponding to G max , M and N are auxiliary adjustment factors, G1 is a first preset gray scale, G2 is a second preset gray scale, and G2 is greater than or equal to G1.

[0111] Specifically, G x <G1 is a first gray scale range, G1≤G x ≤G2 is a second gray scale range, G x >G2 is a third gray scale range. The auxiliary adjustment factors M and N can finely adjust the brightness of each gray scale, so that the brightness transition of each gray scale is smoother while ensuring good contrast between high gray scales and low gray scales.

[0112] Furthermore, for gray levels that do not require brightness adjustment, M and N are 0, while for gray levels that do require brightness adjustment, M and N can be the same or different.

[0113] S1212. Perform gamma adjustment on the display panel according to the adjusted gamma formula.

[0114] Specifically, the target brightness of each gray level is determined according to the adjusted gamma formula, and the display panel is adjusted according to the target brightness to determine the driving data corresponding to each gray level.

[0115] This embodiment adjusts the gamma formula by using an auxiliary adjustment factor, which can fine-tune the brightness of each gray level. While ensuring good contrast between high and low gray levels, it also makes the brightness transition of each gray level smoother.

[0116] Based on the above embodiments, optionally, gamma adjustment of the display panel is performed according to the adjusted gamma formula, including:

[0117] The target brightness of multiple binding point gray levels is determined based on the adjusted gamma formula;

[0118] The display panel is adjusted according to the target brightness to determine the driving data corresponding to the grayscale of the bound points.

[0119] Specifically, the bound-point grayscale is the grayscale used for gamma adjustment. The display panel can be set with multiple bound-point grayscales. For example, bound-point grayscales may include 8, 16, 32, 48, 64, 96, 128, 144, 168, 196, 200, 216, etc. The bound-point grayscale is input into the adjusted gamma formula to determine the target brightness corresponding to the bound-point grayscale. Based on the target brightness, the driving data input to the display panel is determined, and the display brightness of the display panel is measured. The driving data is adjusted based on the difference between the measured brightness and the target brightness until the display brightness is the same as or close to the target brightness.

[0120] Based on the above embodiments, optionally, the display panel is adjusted according to the target brightness to determine the driving data corresponding to the grayscale of the bound points, including:

[0121] Input the initial driving data corresponding to the grayscale of the binding points into the display panel;

[0122] Obtain the measured brightness of the display panel;

[0123] The driver data input to the display panel is adjusted based on the difference between the measured brightness and the target brightness. After each adjustment of the driver data, the measured brightness of the display panel is re-acquired until the difference between the measured brightness and the target brightness is less than the preset brightness threshold.

[0124] Specifically, the measured brightness is the actual display brightness of the display panel measured by optical equipment. The driving data input to the display panel is adjusted based on the difference between the measured brightness and the target brightness. After each adjustment, the measured brightness of the display panel is reacquired, and the driving data input to the display panel is adjusted again based on the difference between the measured brightness and the target brightness until the difference between the measured brightness and the target brightness is less than a preset brightness threshold. The driving data at this point is then determined as the driving data corresponding to the grayscale of the bound point.

[0125] This invention also provides a gamma adjustment device for a display panel. Figure 7 This is a schematic diagram of a gamma debugging device for a display panel provided in an embodiment of the present invention, for reference. Figure 7 The gamma adjustment device for the display panel includes:

[0126] The gamma determination module 210 is used to determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases.

[0127] The gamma debugging module 220 is used to perform gamma debugging on the display panel based on the gamma value.

[0128] Optionally, the gamma debugging device also includes:

[0129] An adjustment factor determination module is used to determine an auxiliary adjustment factor before performing gamma adjustment on the display panel based on the gamma value; wherein the auxiliary adjustment factor is used to adjust the brightness of some gray levels;

[0130] The gamma adjustment module 220 is specifically used to perform gamma adjustment on the display panel according to the gamma value and the auxiliary adjustment factor.

[0131] Optionally, the gamma debugging module 220 includes:

[0132] The Gamma Formula Determination Submodule is used to determine the adjusted gamma formula based on the gamma value and the auxiliary adjustment factor.

[0133] The debugging submodule is used to perform gamma debugging on the display panel according to the adjusted gamma formula.

[0134] The adjusted gamma formula includes:

[0135]

[0136]

[0137] Where γ is the gamma value, G x For grayscale, G max L represents the maximum grayscale value of the display panel. x For G x The corresponding brightness, Lmax For G max The corresponding brightness, M and N are auxiliary adjustment factors, G1 is the first preset gray level, G2 is the second preset gray level, and G2 is greater than or equal to G1.

[0138] Optionally, the debug submodule includes:

[0139] The target brightness determination unit is used to determine the target brightness of multiple bound point gray levels according to the adjusted gamma formula.

[0140] The driving data determination unit is used to adjust the display panel according to the target brightness and determine the driving data corresponding to the grayscale of the binding point.

[0141] Optionally, the driving data determination unit includes:

[0142] An initial drive data input subunit is used to input the initial drive data corresponding to the grayscale of the binding point to the display panel;

[0143] The measured brightness acquisition subunit is used to acquire the measured brightness of the display panel;

[0144] The drive data adjustment subunit is used to adjust the drive data input to the display panel according to the difference between the measured brightness and the target brightness. After each adjustment of the drive data, the measured brightness of the display panel is re-acquired until the difference between the measured brightness and the target brightness is less than a preset brightness threshold.

[0145] The gamma adjustment device for the display panel provided in this embodiment belongs to the same inventive concept as the gamma adjustment method for the display panel provided in any embodiment of the present invention, and has corresponding beneficial effects. For technical details not covered in this embodiment, please refer to the gamma adjustment method for the display panel described in any embodiment of the present invention.

[0146] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0147] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A gamma adjustment method for a display panel, characterized in that, include: Determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases; Perform gamma adjustment on the display panel based on the gamma value.

2. The gamma debugging method according to claim 1, characterized in that: As the grayscale increases, the gamma value of the display panel decreases in a stepwise manner.

3. The gamma debugging method according to claim 1, characterized in that: The display panel includes a first grayscale range, a second grayscale range, and a third grayscale range. The minimum grayscale level of the second grayscale range is greater than the maximum grayscale level of the first grayscale range, and the minimum grayscale level of the third grayscale range is greater than the maximum grayscale level of the second grayscale range. The gamma value of the first grayscale range is greater than the gamma value of the second grayscale range, and the gamma value of the second grayscale range is greater than the gamma value of the third grayscale range. Preferably, the gamma value used in the second grayscale range is the preset gamma value; Preferably, within the first grayscale range, the gamma value of the display panel gradually decreases as the grayscale increases; Preferably, in the third grayscale range, the gamma value of the display panel gradually decreases as the grayscale increases; Preferably, the average gamma value of all gray levels is the preset gamma value.

4. The gamma debugging method according to claim 3, characterized in that: The first grayscale range includes multiple first sub-grayscale ranges, with different gamma values ​​used for different first sub-grayscale ranges and the same gamma value used for the same first sub-grayscale range. Preferably, the third grayscale range includes multiple second sub-grayscale ranges, with different gamma values ​​used in different second sub-grayscale ranges and the same gamma value used in the same second sub-grayscale range. Preferably, the difference in gamma values ​​used for two adjacent first sub-grayscale ranges is the same, and the difference in gamma values ​​used for two adjacent second sub-grayscale ranges is the same. Preferably, each of the first sub-grayscale ranges includes the same number of grayscale levels, and each of the second sub-grayscale ranges includes the same number of grayscale levels.

5. The gamma debugging method according to any one of claims 1-4, characterized in that, Before performing gamma adjustment on the display panel based on the gamma value, the following steps are also included: Determine an auxiliary adjustment factor; wherein the auxiliary adjustment factor is used to adjust the brightness of some gray levels; Performing gamma adjustment on the display panel based on the gamma value includes: The display panel is gamma-adjusted based on the gamma value and the auxiliary adjustment factor.

6. The gamma debugging method according to claim 5, characterized in that: The auxiliary adjustment factor is used to adjust the brightness of at least some transition gray levels; wherein, the transition gray level is an adjacent gray level in an adjacent sub-gray level range with two different gamma values ​​or an adjacent gray level in an adjacent gray level range with two different gamma values. Preferably, at least some of the transition gray levels correspond to different auxiliary adjustment factors.

7. The gamma debugging method according to claim 5, characterized in that: When the display panel includes a first grayscale range, a second grayscale range, and a third grayscale range, the auxiliary adjustment factor is used to reduce the brightness of some grayscale levels within the first grayscale range and increase the brightness of some grayscale levels within the third grayscale range.

8. The gamma debugging method according to claim 5, characterized in that, Gamma adjustment of the display panel based on the gamma value and the auxiliary adjustment factor includes: The adjusted gamma formula is determined based on the gamma value and the auxiliary adjustment factor. Perform gamma adjustment on the display panel according to the adjusted gamma formula; The adjusted gamma formula includes: Where γ is the gamma value, G x For grayscale, G max L represents the maximum grayscale value of the display panel. x For G x The corresponding brightness, L max For G max The corresponding brightness, M and N are auxiliary adjustment factors, G1 is the first preset gray level, G2 is the second preset gray level, and G2 is greater than or equal to G1.

9. The gamma debugging method according to claim 8, characterized in that, Perform gamma calibration on the display panel according to the adjusted gamma formula, including: The target brightness of multiple binding point gray levels is determined based on the adjusted gamma formula; The display panel is adjusted according to the target brightness to determine the driving data corresponding to the grayscale of the bound point; Preferably, the display panel is adjusted according to the target brightness to determine the driving data corresponding to the grayscale of the bound dots, including: Input the initial driving data corresponding to the grayscale of the binding point into the display panel; Obtain the measured brightness of the display panel; The driving data input to the display panel is adjusted based on the difference between the measured brightness and the target brightness. After each adjustment of the driving data, the measured brightness of the display panel is re-acquired until the difference between the measured brightness and the target brightness is less than a preset brightness threshold.

10. A gamma adjustment device for a display panel, characterized in that, include: A gamma determination module is used to determine the gamma value of the display panel; wherein, as the grayscale increases, the gamma value of the display panel gradually decreases; The gamma adjustment module is used to perform gamma adjustment on the display panel based on the gamma value.

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