Method for setting gamma extreme value parameters of display panel and display panel

Abstract

The present application relates to the field of display panel technology and specifically discloses a method for setting gamma extreme value parameters of a display panel and a display panel, wherein the method for setting gamma extreme value parameters of the display panel includes: setting gamma extreme value parameters corresponding to each brightness value; obtaining multiple grayscale intervals of the display panel based on the set brightness value and gamma standard parameter value corresponding to the extreme grayscale; determining the corresponding gamma extreme value adjustment strategy based on different grayscale intervals, and adjusting the gamma extreme value parameters corresponding to each grayscale interval. In this way, the method for setting gamma extreme value parameters in the present application can reasonably set the gamma debugging range of the display panel.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to a method for setting gamma extreme value parameters of a display panel and a display panel. Background Art

[0002] Currently, due to the large process fluctuations and complexity of AMOLED (Active Matrix / Organic Light Emitting Diode) panels, it is impossible to guarantee good display effects by sharing a single set of gamma (display parameters) like LCD (Liquid Crystal Display). Instead, each AMOLED module needs to be debugged, and multiple sets of gamma adjustments are required from brightest to darkest.

[0003] Among them, gamma needs to be debugged in the module factory and then burned into the display module chip before being released to the customer. Customers usually have clear requirements for gamma. For example, the minimum, standard, and maximum values ​​of gamma need to correspond to gamma2.0min, 2.2typ, 2.4max, or 1.9min, 2.2typ, 2.5max. When debugging gamma within the factory, the corresponding brightness spec (brightness extreme value parameter) generally takes into account both effect and time. If the brightness spec setting range is too small, it will lead to a very long gamma debugging time and affect production capacity. If the brightness spec is set too wide, it will affect the display effect.

[0004] The brightness spec and gamma settings in existing solutions are all based on factory experience, which often results in some products having gamma exceeding the specifications (exceeding the maximum or minimum gamma values) or the production line taking too long to debug gamma. Summary of the Invention

[0005] The present application provides a method for setting gamma extreme value parameters of a display panel and a display panel, so as to reasonably set the gamma debugging range of the display panel.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a method for setting the gamma extreme value parameters of a display panel, the setting method including: setting the gamma extreme value parameters corresponding to each brightness value; obtaining multiple grayscale intervals of the display panel according to the set brightness value and gamma standard parameter value corresponding to the extreme grayscale; determining the corresponding gamma extreme value adjustment strategy according to different grayscale intervals, and adjusting the gamma extreme value parameters corresponding to each grayscale interval.

[0007] Among them, the step of setting the gamma extreme value parameters corresponding to each brightness value includes: setting the gamma extreme value parameters corresponding to multiple reference brightness values; determining the gamma extreme value parameters corresponding to any brightness value between the two adjacent reference brightness values ​​based on the gamma extreme value parameters corresponding to the two adjacent reference brightness values; and setting the gamma extreme value parameters corresponding to the brightness interval greater than the reference brightness maximum value, and setting the gamma extreme value parameters corresponding to the brightness interval less than the reference brightness minimum value.

[0008] The step of determining the gamma extreme value parameter corresponding to any brightness value between the two adjacent reference brightness values ​​based on the gamma extreme value parameters corresponding to the two adjacent reference brightness values ​​includes:

[0009] The gamma maximum value corresponding to any brightness value is calculated by formula (1):

[0010]

[0011] The gamma minimum value corresponding to any brightness value is calculated by calculation formula (2):

[0012]

[0013] Where p and q are two adjacent reference brightness values, and l is any brightness value between p and q.

[0014] Among them, the step of obtaining multiple grayscale intervals of the display panel based on the set brightness value and gamma standard parameter value corresponding to the extreme grayscale includes: setting the set brightness value and gamma standard parameter value corresponding to the extreme grayscale; determining multiple binding point grayscales; determining the grayscale brightness value of each binding point grayscale based on the set brightness value and gamma standard parameter value corresponding to the extreme grayscale; obtaining the maximum gamma value and minimum gamma value of each binding point grayscale based on the gamma extreme value parameter corresponding to the grayscale brightness value of each binding point grayscale; determining the target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale; and determining the multiple grayscale intervals based on the target boundary grayscale.

[0015] The step of determining the grayscale brightness value of each binding point grayscale based on the set brightness value corresponding to the extreme grayscale and the gamma standard parameter value includes:

[0016] The grayscale brightness value of each binding point grayscale is calculated by calculation formula (3):

[0017]

[0018] Wherein, n is the grayscale value of the maximum grayscale, i is the grayscale value of the grayscale of the binding point, γ is the gamma standard parameter value, Ln is the set brightness value corresponding to the maximum grayscale.

[0019] Among them, the step of determining the target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales includes: obtaining the difference between the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales based on the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales; based on the difference between the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales, determining, among all binding point grayscales whose difference between the maximum gamma value and the minimum gamma value is greater than a preset difference, the binding point grayscale adjacent to the binding point grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference as the target boundary grayscale of the display panel.

[0020] Among them, the step of determining the target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales includes: performing a fitting operation on the maximum gamma value corresponding to each of the binding point grayscales, and obtaining a first fitting function curve; performing a fitting operation on the minimum gamma value corresponding to each of the binding point grayscales, and obtaining a second fitting function curve; based on the first fitting function curve and the second fitting function curve, determining, among all grayscales whose difference between the maximum gamma value and the minimum gamma value is greater than a preset difference, a grayscale adjacent to the grayscale whose difference between the maximum gamma value and the minimum gamma value is less than a preset difference, as the target boundary grayscale of the display panel.

[0021] Among them, the step of determining the multiple grayscale intervals based on the target boundary grayscale includes: dividing all grayscales between any two adjacent target boundary grayscales into the same grayscale interval, dividing all grayscales greater than the maximum target boundary grayscale into the same grayscale interval, and dividing all grayscales less than the minimum target boundary grayscale into the same grayscale interval.

[0022] Among them, the step of determining the corresponding gamma extreme value adjustment strategy according to different grayscale intervals and adjusting the gamma extreme value parameters corresponding to each grayscale interval includes: determining a first grayscale interval in which the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the grayscale interval is greater than a preset difference, and a second grayscale interval in which the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the grayscale interval is less than a preset difference; adjusting the gamma extreme value parameters corresponding to the first grayscale interval according to the first gamma extreme value adjustment strategy; adjusting the gamma extreme value parameters corresponding to the second grayscale interval according to the second gamma extreme value adjustment strategy.

[0023] Among them, the step of adjusting the gamma extreme value parameters corresponding to the first grayscale interval according to the first gamma extreme value adjustment strategy includes: reducing the maximum gamma value corresponding to each grayscale in the first grayscale interval, and / or increasing the minimum gamma value corresponding to each grayscale in the first grayscale interval; or, maintaining the gamma extreme value parameters corresponding to the first grayscale interval unchanged; the step of adjusting the gamma extreme value parameters corresponding to the second grayscale interval according to the second gamma extreme value adjustment strategy includes: increasing the maximum gamma value corresponding to each grayscale in the second grayscale interval, and / or reducing the minimum gamma value corresponding to each grayscale in the second grayscale interval.

[0024] Among them, the setting method also includes: setting a brightness error threshold corresponding to each brightness range; determining the brightness extreme value corresponding to each grayscale based on the gamma extreme value parameter corresponding to each grayscale; determining the brightness range in which the grayscale brightness value of each grayscale is located and the brightness error value of the grayscale brightness value of each grayscale according to the brightness extreme value corresponding to each grayscale; determining all grayscales whose brightness error value of the grayscale brightness value is less than the brightness error threshold corresponding to the brightness range in which the grayscale brightness value is located as the target grayscale; increasing the brightness error value of the grayscale brightness value of the target grayscale to adjust the gamma extreme value parameter corresponding to the target grayscale.

[0025] The step of determining the brightness extreme value corresponding to each grayscale based on the gamma extreme value parameters corresponding to each grayscale includes:

[0026] The maximum brightness value corresponding to each grayscale is calculated by formula (4):

[0027]

[0028] The minimum brightness value corresponding to each grayscale is calculated by formula (5):

[0029]

[0030] Among them, n is the grayscale value of the maximum grayscale, j is the grayscale value of each grayscale, gammajmax is the gamma maximum value corresponding to gray level j, gammajmin is the minimum gamma value corresponding to gray level j.

[0031] To solve the above technical problems, another technical solution adopted in this application is: providing a display panel, which includes a memory and a processor coupled to each other, and the processor is used to execute program instructions stored in the memory to implement a method for setting the gamma extreme value parameters of any of the above display panels.

[0032] The beneficial effect of the present application is that, different from the prior art, the method for setting the gamma extreme value parameters of the display panel in the present application can obtain multiple grayscale intervals of the display panel according to the set brightness value and the gamma standard parameter value corresponding to the extreme grayscale after setting the gamma extreme value parameters corresponding to each brightness value, and then determine the corresponding gamma extreme value adjustment strategy according to different grayscale intervals, and adjust the gamma extreme value parameters corresponding to each grayscale interval, so that the gamma debugging range of the display panel can be set to a reasonable range, which can not only ensure that the gamma specifications are met when the gamma is debugged, but also ensure that the production line debugging is passed in one go. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0034] Figure 1 1 is a flow chart of an embodiment of a method for setting gamma extreme value parameters of a display panel of the present application;

[0035] Figure 2 yes Figure 1 A flow chart of an embodiment of step S11;

[0036] Figure 3 yes Figure 1 A flow chart of an embodiment of step S12;

[0037] Figure 4 yes Figure 3 A flow chart of an embodiment of step S125;

[0038] Figure 5 yes Figure 3 A schematic flow chart of another embodiment of step S125;

[0039] Figure 6 yes Figure 1 A flow chart of an embodiment of step S13;

[0040] Figure 7 This is a schematic diagram of the division of grayscale intervals in an application scenario;

[0041] Figure 8 1 is a flow chart of another embodiment of a method for setting gamma extreme value parameters of a display panel of the present application;

[0042] Figure 9 It is a structural diagram of an embodiment of a display panel of the present application. DETAILED DESCRIPTION

[0043] In order to make the technical problems solved by this application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0044] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] See also Figure 1 , Figure 1 1 is a flow chart of an embodiment of a method for setting gamma extreme value parameters of a display panel of the present application. This embodiment includes the following steps:

[0046] S11: Set the gamma extreme value parameters corresponding to each brightness value.

[0047] It is understandable that in order to ensure a good display effect of the display panel, the brightness of the display panel needs to be set, and the brightness setting needs to be achieved by debugging the gamma value of the display panel. However, when debugging the gamma value, due to the accuracy of the acquisition equipment, the instability of the screen brightness of the display panel, etc., it is impossible to debug the brightness corresponding to each grayscale to achieve the brightness corresponding to the gamma standard value. Therefore, it is necessary to set a brightness range, that is, the brightness spec. As long as the brightness is debugged within the brightness spec, the customer specifications can be met. Since the brightness debugging needs to be achieved by debugging the gamma value, it is actually possible to set a gamma value range, that is, the gamma spec. As long as the gamma is debugged within the gamma spec, the customer specifications can be met.

[0048] The range of gamma values ​​is determined by the maximum gamma value and the minimum gamma value, which are gamma extreme value parameters. The gamma extreme value parameters can be understood as the parameters of the allowable error range of the corresponding gamma value when the display panel achieves a preset brightness value.

[0049] S12: Acquire multiple grayscale intervals of the display panel according to the set brightness value and the gamma standard parameter value corresponding to the extreme grayscale.

[0050] Furthermore, by performing statistical analysis on the correspondence between the grayscales and brightness values ​​achievable by the display panel, it is possible to determine the grayscales that have a greater impact on the brightness value and the grayscales that have a smaller impact on the brightness value. For example, the set brightness value and gamma standard parameter value corresponding to the extreme grayscale of the display panel are first obtained, while the brightness values ​​corresponding to other grayscales increase with increasing grayscale and decrease with decreasing grayscale, thereby obtaining the brightness values ​​corresponding to the other grayscales. Since brightness adjustment is achieved by adjusting the gamma value, the brightness value corresponding to each grayscale is associated with a gamma extreme parameter, that is, a maximum gamma value and a minimum gamma value. Therefore, the gamma value range between the maximum gamma value and the minimum gamma value corresponding to the grayscale that has a greater impact on the brightness value is larger, while the gamma value range between the maximum gamma value and the minimum gamma value corresponding to the grayscale that has a smaller impact on the brightness value is smaller. Therefore, all grayscales can be divided into multiple grayscale intervals based on the size of the gamma value range corresponding to each grayscale. In other words, multiple grayscale intervals of the display panel can be obtained based on the set brightness value and gamma standard parameter value corresponding to the extreme grayscale.

[0051] S13: Determine corresponding gamma extreme value adjustment strategies according to different grayscale intervals, and adjust the gamma extreme value parameters corresponding to each grayscale interval.

[0052] It can be understood that in step S12, all grayscales are divided into multiple grayscale intervals according to the size of the gamma value range corresponding to each grayscale. For grayscales with a larger gamma value range, the actual production line gamma debugging time may be too long, and for grayscales with a smaller gamma value range, it is easy for the debugged module gamma to exceed customer specifications during production line gamma debugging. Therefore, the corresponding gamma extreme value adjustment strategy can be determined according to different grayscale intervals, and the gamma extreme value parameters corresponding to the grayscale in each grayscale interval can be adjusted according to the corresponding gamma extreme value adjustment strategy.

[0053] In the above scheme, after setting the gamma extreme value parameters corresponding to each brightness value, multiple grayscale intervals of the display panel can be obtained according to the set brightness value corresponding to the extreme grayscale and the gamma standard parameter value, and then the corresponding gamma extreme value adjustment strategy is determined according to different grayscale intervals, and the gamma extreme value parameters corresponding to each grayscale interval are adjusted, so that the gamma debugging range of the display panel can be set to a reasonable range, which can not only ensure that the gamma specifications are met when the gamma is debugged, but also ensure that the production line debugging is passed in one go.

[0054] Please combine Figure 2 , Figure 2 yes Figure 1 Flowchart of an embodiment of step S11 in FIG. In one embodiment, the above-mentioned S11 may specifically include the following steps:

[0055] S111: Setting gamma extreme value parameters corresponding to a plurality of reference brightness values.

[0056] It is understandable that in order to set the gamma extreme value parameters corresponding to each brightness value of the display panel, the gamma extreme value parameters corresponding to a specific brightness value may be first expanded.

[0057] Specifically, you can select 100nit (nit, brightness unit), 10nit, 1nit, 0.1nit, 0.01nit and 0.001nit as reference brightness values, set the gamma extreme value parameters corresponding to each reference brightness value, and the gamma extreme value parameters corresponding to the reference brightness value include the gamma maximum value and gamma minimum value corresponding to the reference brightness value. For example, since the larger the gamma value, the darker the screen display, and the smaller the gamma value, the brighter the screen display, setting the minimum brightness value (Lspec) of 100nit min ) is the brightness value corresponding to the gamma value of 2.21 (L gamma2.21 ), set the maximum brightness value of 100nit (Lspec max ) is the brightness value corresponding to the gamma value of 2.19 (L gamma2.19 ), that is, the gamma maximum value corresponding to 100nit is set to gamma2.21, and the gamma minimum value is gamma2.19; similarly, the gamma maximum value corresponding to 10nit can be set to gamma2.215, and the gamma minimum value can be set to gamma2.185, the gamma maximum value corresponding to 1nit can be set to gamma2.22, and the gamma minimum value can be set to gamma2.18, the gamma maximum value corresponding to 0.1nit can be set to gamma2.24, and the gamma minimum value can be set to gamma2.16, the gamma maximum value corresponding to 0.01nit can be set to gamma2.26, and the gamma minimum value can be set to gamma2.14, the gamma maximum value corresponding to 0.001nit can be set to gamma2.28, and the gamma minimum value can be set to gamma2.12. In other embodiments, the above-mentioned reference brightness values ​​can also be any other reasonable brightness values, and there can also be more or fewer reference brightness values, and the corresponding gamma extreme value parameters can also be any other reasonable values, which is not limited in this application.

[0058] S112: Based on the gamma extreme value parameters corresponding to two adjacent reference brightness values, determine the gamma extreme value parameter corresponding to any brightness value between the two adjacent reference brightness values.

[0059] Specifically, after setting a plurality of reference brightness values ​​and their corresponding gamma extreme value parameters, the gamma extreme value parameter corresponding to any brightness value between two adjacent reference brightness values ​​can be obtained by interpolation based on the gamma extreme value parameters corresponding to the two adjacent reference brightness values.

[0060] Furthermore, the above step S112 may specifically include:

[0061] The gamma maximum value corresponding to any brightness value is calculated by formula (1):

[0062]

[0063] The gamma minimum value corresponding to any brightness value is calculated by calculation formula (2):

[0064]

[0065] Where p and q are two adjacent reference brightness values, and l is any brightness value between p and q.

[0066] Specifically, p and q are two adjacent reference brightness values, and l is any brightness value between p and q. Therefore, the following formula can be obtained by interpolation:

[0067]

[0068] By transforming the above formula, we can get the corresponding formulas (1) and (2). For example, p is 10nit, q is 100nit, 10nit≤l≤100nit, since the gamma maximum value corresponding to 100nit is gamma2.21, the gamma minimum value is gamma2.19, and the gamma maximum value corresponding to 10nit is gamma2.215, the gamma minimum value is gamma2.185, therefore, the gamma maximum value corresponding to the brightness value l is Gamma minimum corresponding to brightness value l Therefore, when l is 55nit, substituting it into the formula, we can get: the gamma maximum value corresponding to 55nit is gamma2.2125, and the gamma minimum value corresponding to 55nit is gamma2.1875. The gamma extreme value parameters corresponding to other brightness values ​​can be obtained similarly.

[0069] S113: Setting gamma extreme value parameters corresponding to a brightness interval greater than a reference brightness maximum value, and setting gamma extreme value parameters corresponding to a brightness interval less than a reference brightness minimum value, wherein the reference brightness maximum value is the maximum reference brightness value, and the reference brightness minimum value is the minimum reference brightness value.

[0070] It is understandable that in step S112, the gamma extreme value parameters corresponding to any brightness value between two adjacent reference brightness values ​​can be obtained by interpolation. However, the gamma extreme value parameters corresponding to all brightness values ​​greater than the reference brightness maximum value and all brightness values ​​less than the reference brightness minimum value cannot be obtained by interpolation. Therefore, it is necessary to set the gamma extreme value parameters corresponding to the brightness interval greater than the reference brightness maximum value, and set the gamma extreme value parameters corresponding to the brightness interval less than the reference brightness minimum value. For example, when 100 nit is the reference brightness maximum value and 0.001 nit is the reference brightness minimum value, the gamma maximum value corresponding to all brightness values ​​greater than 100 nit can be set to gamma2.21 and the gamma minimum value can be set to gamma2.19, and the gamma maximum value corresponding to less than 0.001 nit can be set to gamma2.35 and the gamma minimum value can be set to gamma2.05.

[0071] Please combine Figure 3 , Figure 3 yes Figure 1 Flowchart of an embodiment of step S12 in FIG. In one embodiment, the above-mentioned S12 may further include the following steps:

[0072] S121: Setting a set brightness value and a gamma standard parameter value corresponding to the extreme grayscale.

[0073] It is understandable that in order to perform statistical analysis on the correspondence between the grayscale and gamma value of the display panel, it is first necessary to expand it based on specific parameters.

[0074] Specifically, based on the maximum and minimum values ​​of the grayscale that the display panel can achieve, that is, the extreme grayscale, a corresponding set brightness value is first set, such as any reasonable value such as the maximum or minimum value of the brightness that the display panel can achieve, and a corresponding gamma standard parameter value is determined, such as gamma2.2typ, gamma2typ, gamma2.4typ, etc. In addition, due to the screen conditions of the display panel itself and other reasons, it is generally necessary to set multiple groups of gamma to ensure that the display effect of the screen is OK under the entire brightness bar, and it must be based on the user's actual application scenarios. For example, the maximum and minimum values ​​of the brightness bar of the mobile phone need to be set with a gamma group. Therefore, 3 groups of gamma can be set under the entire brightness bar of the screen, namely gamma1~3. At this time, the set brightness value of the 255 grayscale corresponding to gamma1 can be set to 700nit, the set brightness value of the 255 grayscale corresponding to gamma2 can be set to 350nit, and the set brightness value of the 255 grayscale corresponding to gamma3 can be set to 5nit. The set brightness value of the 0 grayscale corresponding to gamma1~3 can be uniformly set to 0 or below 0.0005nit.

[0075] S122: Determine multiple binding point grayscales.

[0076] It is understandable that, in order to facilitate setting and analyzing the grayscale of the display panel, a plurality of specific binding point grayscales are usually defined based on the maximum grayscale of the display panel and the number of groups.

[0077] For example, when the grayscale implementation range of the display panel is 0 to 255 and 10 specific binding point grayscales need to be divided, the 10 binding point grayscales can be determined in sequence as follows: GammaGray1=0, GammaGray2=4, GammaGray3=8, GammaGray4=17, GammaGray5=32, GammaGray6=63, GammaGray7=100, GammaGray8=183, GammaGray9=222, GammaGray10=255.

[0078] S123: Determine the grayscale brightness value of each binding point grayscale based on the set brightness value corresponding to the extreme grayscale and the gamma standard parameter value.

[0079] Specifically, when multiple binding point grayscales are determined, the grayscale brightness value of each binding point grayscale can be calculated based on the set brightness value corresponding to the extreme grayscale and the gamma standard parameter value according to the setting function corresponding to the brightness and gamma value.

[0080] S124: Acquire a maximum gamma value and a minimum gamma value of each binding point grayscale based on a gamma extreme value parameter corresponding to the grayscale brightness value of each binding point grayscale.

[0081] Furthermore, when the grayscale brightness value of each binding point grayscale is obtained, the gamma extreme value parameters corresponding to the grayscale brightness value of each binding point grayscale can be determined. Specifically, because each gamma extreme value parameter is set specifically corresponding to each brightness value, when the grayscale brightness value of each binding point grayscale is determined, the gamma extreme value parameters corresponding to the grayscale brightness value of each binding point grayscale can be determined, that is, the maximum gamma value and minimum gamma value of each binding point grayscale can be obtained.

[0082] S125: Determine a target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale.

[0083] It can be understood that after obtaining the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale, the grayscale whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference, and the grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference can be determined by analyzing the difference between the maximum gamma value and the minimum gamma value. Therefore, among all grayscales whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference, the grayscale or binding point grayscale adjacent to the grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference can be determined as the target boundary grayscale of the display panel.

[0084] S126: Determine the plurality of grayscale intervals based on the target boundary grayscale.

[0085] Specifically, after the target boundary grayscale is acquired, all grayscales between two adjacent target boundary grayscales may be divided into a grayscale interval, thereby determining a plurality of grayscale intervals.

[0086] Furthermore, in one embodiment, the above step S123 may specifically include: calculating the grayscale brightness value of each binding point grayscale by using the calculation formula (3):

[0087]

[0088] Wherein, n is the grayscale value of the maximum grayscale, i is the grayscale value of the grayscale of the binding point, γ is the gamma standard parameter value, L n is the set brightness value corresponding to the maximum grayscale.

[0089] For ease of understanding, the grayscale value n of the maximum grayscale is 255, and its corresponding set brightness value L 255 =500nit, and the gamma standard parameter value γ is 2.2 as an example, it can be seen that the grayscale brightness value of the binding point grayscale i is: When the binding point grayscale i is set to 255, 222, 183, 100, 63, 32, 17, 8, 4, and 0 in sequence, the grayscale brightness value of each binding point grayscale can be calculated.

[0090] It can be understood that the set brightness value L corresponding to the maximum grayscale 255 255 It can also be any other reasonable parameter, such as 2nit or 5nit, and the corresponding calculation process is the same as above, which will not be repeated here.

[0091] Please combine Figure 4 , Figure 4 yes Figure 3 In one embodiment, the above step S125 may include the following steps:

[0092] S1251a: Based on the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale, obtain a difference between the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale.

[0093] S1252a: Based on the difference between the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales, determine, among all the binding point grayscales whose difference between the maximum gamma value and the minimum gamma value is greater than a preset difference, the binding point grayscale adjacent to the binding point grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference, as the target boundary grayscale of the display panel.

[0094] Specifically, after obtaining the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale, the difference between the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale can be calculated, and then the difference between the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale can be compared with the preset difference to determine the binding point grayscale whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference, and the binding point grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference. Then, among all the binding point grayscales whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference, the binding point grayscales adjacent to the binding point grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference are obtained, and these binding point grayscales are used as the boundaries for dividing the grayscale intervals, that is, the target boundary grayscales of the display panel. In this embodiment, the target boundary grayscales are selected from the binding point grayscales.

[0095] Please combine Figure 5 , Figure 5 yes Figure 3 In another embodiment of the process flow diagram of step S125, the above-mentioned step S125 may specifically include the following steps:

[0096] S1251b: Perform a fitting operation on the maximum gamma value corresponding to each binding point grayscale, and obtain a first fitting function curve.

[0097] S1252b: Perform a fitting operation on the minimum gamma value corresponding to each binding point grayscale to obtain a second fitting function curve.

[0098] Specifically, after determining the maximum gamma value corresponding to each binding point grayscale, a suitable coordinate system can be established based on the maximum gamma values ​​corresponding to all binding point grayscales, and a fitting operation can be performed on the coordinate system to obtain a corresponding first fitting function curve. The first fitting function curve can reflect the maximum gamma values ​​corresponding to all grayscales. Similarly, a fitting operation can be performed on the minimum gamma value corresponding to each binding point grayscale to obtain a second fitting function curve. The second fitting function curve can reflect the minimum gamma values ​​corresponding to all grayscales.

[0099] S1253b: Based on the first fitting function curve and the second fitting function curve, determine, among all gray scales in which the difference between the maximum gamma value and the minimum gamma value is greater than a preset difference, a gray scale adjacent to the gray scale in which the difference between the maximum gamma value and the minimum gamma value is less than a preset difference, as the target boundary gray scale of the display panel.

[0100] Therefore, since the first fitting function curve and the second fitting function curve can respectively reflect the maximum gamma value and the minimum gamma value corresponding to each gray scale, the difference between the maximum gamma value and the minimum gamma value corresponding to each gray scale can be calculated, and then the difference between the maximum gamma value and the minimum gamma value corresponding to each gray scale is compared with the preset difference to determine the gray scale whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference, and the gray scale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference. Then, among all gray scales whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference, the gray scales adjacent to the gray scale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference are obtained, and these gray scales are used as the boundaries for dividing the gray scale intervals, that is, the target boundary gray scales of the display panel. In this embodiment, the target boundary gray scales are selected from all gray scales.

[0101] In one embodiment, step S126 may specifically include: dividing all grayscales between any two adjacent target boundary grayscales into the same grayscale interval, dividing all grayscales greater than a maximum target boundary grayscale into the same grayscale interval, and dividing all grayscales less than a minimum target boundary grayscale into the same grayscale interval. The maximum target boundary grayscale is the target boundary grayscale with the largest grayscale value, and the minimum target boundary grayscale is the target boundary grayscale with the smallest grayscale value.

[0102] It can be understood that, since the difference between the maximum gamma value and the minimum gamma value corresponding to all grayscales between two adjacent target boundary grayscales is greater than the preset difference, or is less than the preset difference, all grayscales between any two adjacent target boundary grayscales can be divided into the same grayscale interval. Through the above division method, all grayscales between the target boundary grayscales are formed into different grayscale intervals; wherein, all grayscales between two adjacent target boundary grayscales can be further divided into a first grayscale interval and a second grayscale interval based on whether the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale is greater than or less than the preset difference. In addition, it is necessary to divide all grayscales greater than the maximum target boundary grayscale into one grayscale interval, and to divide all grayscales less than the minimum target boundary grayscale into one grayscale interval, so that all grayscales are divided into different grayscale intervals.

[0103] Please combine Figure 6 , Figure 6yes Figure 1 Flowchart of an embodiment of step S13 in FIG. In one embodiment, the above-mentioned S13 may specifically include the following steps:

[0104] S131: Determine a first grayscale interval in which the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the grayscale interval is greater than a preset difference, and a second grayscale interval in which the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the grayscale interval is less than a preset difference.

[0105] S132: Adjust the gamma extreme value parameter corresponding to the first grayscale interval according to a first gamma extreme value adjustment strategy.

[0106] S133: Adjust the gamma extreme value parameter corresponding to the second grayscale interval according to a second gamma extreme value adjustment strategy.

[0107] Specifically, all grayscales whose difference between the maximum gamma value and the minimum gamma value is greater than the preset difference are divided into a first grayscale interval, and all grayscales whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference are divided into a second grayscale interval, that is, the gamma value range corresponding to each grayscale in the first grayscale interval is larger, and the gamma value range corresponding to each grayscale in the second grayscale interval is smaller. Since for grayscales with a larger gamma value range, the actual production line gamma debugging time may be too long, and for grayscales with a smaller gamma value range, it is easy for the debugged module gamma to exceed the specification range of the standard gamma value required by the customer during production line gamma debugging. Therefore, different gamma extreme value adjustment strategies need to be used to adjust the gamma extreme value parameters corresponding to the first grayscale interval and the gamma extreme value parameters corresponding to the second grayscale interval, so that the gamma debugging range of all positions of the display panel can be set within a reasonable range.

[0108] In one embodiment, the above-mentioned step S132 may specifically include: reducing the maximum gamma value corresponding to each grayscale in the first grayscale interval, and / or increasing the minimum gamma value corresponding to each grayscale in the first grayscale interval; or maintaining the gamma extreme value parameters corresponding to the first grayscale interval unchanged.

[0109] Specifically, because the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the first grayscale interval is greater than the preset difference, that is, the gamma value range corresponding to each grayscale in the first grayscale interval is relatively large, the actual production line gamma debugging time may be longer, so it is possible to consider appropriately reducing the gamma value range, or keeping the gamma value range unchanged. The gamma value range can be reduced by only reducing the maximum gamma value corresponding to each grayscale in the first grayscale interval, or by only increasing the minimum gamma value corresponding to each grayscale in the first grayscale interval, or by reducing the maximum gamma value corresponding to each grayscale in the first grayscale interval while increasing the minimum gamma value corresponding to each grayscale in the first grayscale interval.

[0110] In one embodiment, the step S133 may specifically include: increasing the maximum gamma value corresponding to each grayscale in the second grayscale interval, and / or decreasing the minimum gamma value corresponding to each grayscale in the second grayscale interval.

[0111] Specifically, because the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the second grayscale interval is less than the preset difference, that is, the gamma value range corresponding to each grayscale in the second grayscale interval is small, it is easy for the debugged module gamma to exceed the standard gamma value specification range required by the customer during gamma debugging on the production line. Therefore, it is possible to consider appropriately expanding the gamma value range. The gamma value range can be expanded by only increasing the maximum gamma value corresponding to each grayscale in the second grayscale interval, or only decreasing the minimum gamma value corresponding to each grayscale in the second grayscale interval, or increasing the maximum gamma value corresponding to each grayscale in the second grayscale interval while decreasing the minimum gamma value corresponding to each grayscale in the second grayscale interval.

[0112] Please combine Figure 7 , Figure 7 This is a schematic diagram of the division of grayscale intervals in an application scenario. Figure 7The three curves for gamma 2.0, gamma 2.2, and gamma 2.4 are shown. It can be seen that the brightness difference at low and high grayscale locations is very small, while the brightness difference in the intermediate grayscale region is relatively large. Therefore, all grayscales can be divided into three grayscale intervals. For example, all grayscales below grayscale 31 are divided into grayscale interval 1, grayscales 31 to grayscale 241 are divided into grayscale interval 2, and all grayscales above grayscale 241 are divided into grayscale interval 3. It is more reasonable to use different gamma spec settings for each of the three grayscale intervals. Therefore, for all grayscales in grayscale intervals 1 and 3, the maximum gamma value can be increased by 0.05 and the minimum gamma value can be decreased by 0.05 based on the originally set gamma spec. This will expand the gamma spec corresponding to all grayscales below grayscale 31 and all grayscales above grayscale 241. For all grayscales in grayscale interval 2, the originally set gamma spec can be maintained unchanged, or the difference between the maximum gamma value and the minimum gamma value can be appropriately reduced.

[0113] See also Figure 8 , Figure 8 FIG. 1 is a flow chart of another embodiment of a method for setting gamma extreme value parameters of a display panel of the present application. This embodiment includes the following steps:

[0114] S81: Set the gamma extreme value parameters corresponding to each brightness value.

[0115] S82: Acquire multiple grayscale intervals of the display panel according to the set brightness value and the gamma standard parameter value corresponding to the extreme grayscale.

[0116] S83: Determine corresponding gamma extreme value adjustment strategies according to different grayscale intervals, and adjust the gamma extreme value parameters corresponding to each grayscale interval.

[0117] Steps S81 to S83 in this embodiment are substantially the same as steps S11 to S13 in the above embodiment, and are not described again here.

[0118] This embodiment also includes the following steps:

[0119] S84: Setting the brightness error threshold corresponding to each brightness range.

[0120] It is understandable that due to the accuracy of the test photoelectric probe, the stability of the screen, and other reasons, there is a certain error in the brightness of the screen display. Therefore, a brightness error threshold can be set. That is, it is necessary to ensure that the difference between the maximum brightness and the minimum brightness corresponding to each brightness value is not less than the corresponding brightness error threshold to avoid debugging during the brightness specification debugging process. In addition, different brightness error thresholds can be set for different brightness ranges. For example, when the brightness value is greater than 100nit, the brightness error threshold is set to 0.1nit. When the brightness value is between 100nit and 10nit, the brightness error threshold is set to 0.08nit. The same applies to other brightness ranges.

[0121] S85: Determine the brightness extreme value corresponding to each gray scale based on the gamma extreme value parameter corresponding to each gray scale.

[0122] Since the brightness adjustment is achieved by adjusting the gamma value, there is a correlation between the gamma extreme value parameters corresponding to the grayscale and the corresponding brightness extreme value. Therefore, since the gamma extreme value parameters corresponding to each grayscale have been obtained in the above steps, the brightness extreme value corresponding to each grayscale can be determined.

[0123] Furthermore, the above step S85 may specifically include:

[0124] The maximum brightness value corresponding to each grayscale is calculated by formula (4):

[0125]

[0126] The minimum brightness value corresponding to each grayscale is calculated by calculation formula (5):

[0127]

[0128] Among them, n is the grayscale value of the maximum grayscale, j is the grayscale value of each grayscale, gamma jmax is the gamma maximum value corresponding to grayscale j, gamma jmin is the minimum gamma value corresponding to gray level j.

[0129] S86: Determine the brightness range of the grayscale brightness value of each grayscale and the brightness error value of the grayscale brightness value of each grayscale according to the brightness extreme value corresponding to each grayscale.

[0130] After determining the brightness extreme values ​​corresponding to each grayscale, since the brightness extreme values ​​include the brightness maximum value and the brightness minimum value, the difference between the brightness maximum value and the brightness minimum value can be calculated to obtain the brightness error value of the grayscale brightness value of each grayscale, and determine the brightness range of the grayscale brightness value of each grayscale.

[0131] S87: Determine all grayscales whose brightness error values ​​of the grayscale brightness values ​​are smaller than the brightness error threshold value corresponding to the brightness range in which the grayscale brightness values ​​are located, as target grayscales.

[0132] S88: Increasing the brightness error value of the grayscale brightness value of the target grayscale to adjust the gamma extreme value parameter corresponding to the target grayscale.

[0133] After determining the brightness range of the grayscale brightness value of each grayscale and the brightness error value of the grayscale brightness value of each grayscale, the brightness error value of the grayscale brightness value of each grayscale can be compared with the brightness error threshold corresponding to the brightness range of the grayscale brightness value. If it is found that the brightness error value of the grayscale brightness value of the target grayscale is less than the brightness error threshold corresponding to the brightness range of the grayscale brightness value, the brightness error value of the grayscale brightness value of the target grayscale can be increased to appropriately relax the brightness error value of the grayscale brightness value of the target grayscale. It can be understood that appropriately relaxing the brightness error value of the grayscale brightness value of the target grayscale is actually appropriately relaxing the gamma spec, that is, adjusting the gamma extreme value parameters corresponding to the target grayscale to ensure the pass rate of the gamma spec debugging.

[0134] This application also provides a display panel, see Figure 9 , Figure 9 FIG2 is a schematic diagram of the structure of an embodiment of a display panel of the present application. The display panel 91 in this embodiment includes a processor 911 and a memory 912. The memory 912 stores a program, and the processor 911 calls the program stored in the memory to execute any of the above-mentioned methods for setting the gamma extreme value parameters of the display panel.

[0135] The beneficial effect of the present application is that, different from the prior art, the method for setting the gamma extreme value parameters of the display panel in the present application can obtain multiple grayscale intervals of the display panel according to the set brightness value and the gamma standard parameter value corresponding to the extreme grayscale after setting the gamma extreme value parameters corresponding to each brightness value, and then determine the corresponding gamma extreme value adjustment strategy according to different grayscale intervals, and adjust the gamma extreme value parameters corresponding to each grayscale interval, so that the gamma debugging range of the display panel can be set to a reasonable range, which can not only ensure that the gamma specifications are met when the gamma is debugged, but also ensure that the production line debugging is passed in one go.

[0136] The above is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for setting gamma extreme value parameters of a display panel, characterized in that: The setting method includes: Setting the gamma extreme value parameters corresponding to each brightness value, wherein the gamma extreme value parameters include a maximum gamma value and a minimum gamma value; Acquire multiple grayscale intervals of the display panel according to a set brightness value corresponding to the extreme grayscale and a gamma value range consisting of the maximum gamma value and the minimum gamma value; determine corresponding gamma extreme value adjustment strategies according to different grayscale intervals, and adjust the gamma extreme value parameters corresponding to each grayscale interval; The step of setting the gamma extreme value parameters corresponding to each brightness value includes: Set the gamma extreme value parameters corresponding to multiple reference brightness values; determining, based on the gamma extreme value parameters corresponding to two adjacent reference brightness values, the gamma extreme value parameters corresponding to any brightness value between the two adjacent reference brightness values; and Set the gamma extreme value parameters corresponding to the brightness interval greater than the reference brightness maximum value, and set the gamma extreme value parameters corresponding to the brightness interval less than the reference brightness minimum value; The step of determining the corresponding gamma extreme value adjustment strategy according to different grayscale intervals and adjusting the gamma extreme value parameters corresponding to each grayscale interval includes: Determine a first grayscale interval in which the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the grayscale interval is greater than a preset difference, and a second grayscale interval in which the difference between the maximum gamma value and the minimum gamma value corresponding to each grayscale in the grayscale interval is less than a preset difference; adjusting the gamma extreme value parameter corresponding to the first grayscale interval according to a first gamma extreme value adjustment strategy; The gamma extreme value parameter corresponding to the second grayscale interval is adjusted according to a second gamma extreme value adjustment strategy.

2. The setting method according to claim 1, wherein: The step of determining the gamma extreme value parameter corresponding to any brightness value between the two adjacent reference brightness values ​​based on the gamma extreme value parameters corresponding to the two adjacent reference brightness values ​​includes: The gamma maximum value corresponding to any brightness value is calculated by formula (1): The gamma minimum value corresponding to any brightness value is calculated by calculation formula (2): Where p and q are two adjacent reference brightness values, and l is any brightness value between p and q.

3. The setting method according to claim 1, wherein: The step of obtaining a plurality of grayscale intervals of the display panel according to a set brightness value corresponding to an extreme grayscale and a gamma range consisting of the maximum gamma value and the minimum gamma value comprises: Setting the set brightness value and gamma standard parameter value corresponding to the extreme grayscale; Determine the grayscale of multiple binding points; Determining the grayscale brightness value of each of the binding point grayscales based on the set brightness value corresponding to the extreme grayscale and the gamma standard parameter value; Based on the gamma extreme value parameters corresponding to the grayscale brightness value of each binding point grayscale, obtaining the maximum gamma value and the minimum gamma value of each binding point grayscale; determining a target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales; The plurality of grayscale intervals are determined based on the target boundary grayscale.

4. The setting method according to claim 3, characterized in that: The step of determining the grayscale brightness value of each binding point grayscale based on the set brightness value corresponding to the extreme grayscale and the gamma standard parameter value includes: The grayscale brightness value of each binding point grayscale is calculated by calculation formula (3): Wherein, n is the grayscale value of the maximum grayscale, i is the grayscale value of the grayscale of the binding point, γ is the gamma standard parameter value, L n is the set brightness value corresponding to the maximum grayscale.

5. The setting method according to claim 3, wherein: The step of determining the target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales includes: Obtaining a difference between the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale based on the maximum gamma value and the minimum gamma value corresponding to each binding point grayscale; Based on the difference between the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales, the binding point grayscale adjacent to the binding point grayscale whose difference between the maximum gamma value and the minimum gamma value is less than the preset difference is determined as the target boundary grayscale of the display panel.

6. The setting method according to claim 3, characterized in that: The step of determining the target boundary grayscale of the display panel based on the maximum gamma value and the minimum gamma value corresponding to each of the binding point grayscales includes: Performing a fitting operation on the maximum gamma value corresponding to the grayscale of each binding point to obtain a first fitting function curve; Performing a fitting operation on the minimum gamma value corresponding to the grayscale of each binding point to obtain a second fitting function curve; Based on the first fitting function curve and the second fitting function curve, a gray scale adjacent to a gray scale having a difference between the maximum gamma value and the minimum gamma value less than a preset difference among all gray scales having a difference between the maximum gamma value and the minimum gamma value greater than a preset difference is determined as a target boundary gray scale of the display panel.

7. The setting method according to claim 3, wherein: The step of determining the plurality of grayscale intervals based on the target boundary grayscale includes: All grayscales between any two adjacent target boundary grayscales are divided into the same grayscale interval, all grayscales greater than the maximum target boundary grayscale are divided into the same grayscale interval, and all grayscales less than the minimum target boundary grayscale are divided into the same grayscale interval.

8. The setting method according to claim 1, wherein: The step of adjusting the gamma extreme value parameter corresponding to the first grayscale interval according to the first gamma extreme value adjustment strategy includes: reducing the maximum gamma value corresponding to each grayscale in the first grayscale interval, and / or increasing the minimum gamma value corresponding to each grayscale in the first grayscale interval; Or, maintaining the gamma extreme value parameter corresponding to the first grayscale interval unchanged; The step of adjusting the gamma extreme value parameter corresponding to the second grayscale interval according to the second gamma extreme value adjustment strategy includes: The maximum gamma value corresponding to each grayscale in the second grayscale interval is increased, and / or the minimum gamma value corresponding to each grayscale in the second grayscale interval is decreased.

9. The setting method according to any one of claims 1 to 8, characterized in that: The setting method further includes: Set the brightness error threshold corresponding to each brightness range; Determine the brightness extreme value corresponding to each grayscale based on the gamma extreme value parameters corresponding to each grayscale; Determining the brightness range of the grayscale brightness value of each grayscale and the brightness error value of the grayscale brightness value of each grayscale according to the brightness extreme value corresponding to each grayscale; Determine all grayscales whose brightness error values ​​of the grayscale brightness values ​​are less than the brightness error threshold value corresponding to the brightness range in which the grayscale brightness values ​​are located as target grayscales; The brightness error value of the grayscale brightness value of the target grayscale is increased to adjust the gamma extreme value parameter corresponding to the target grayscale.

10. The setting method according to claim 9, characterized in that: The step of determining the brightness extreme value corresponding to each grayscale based on the gamma extreme value parameters corresponding to each grayscale includes: The maximum brightness value corresponding to each grayscale is calculated by formula (4): The minimum brightness value corresponding to each grayscale is calculated by formula (5): Among them, n is the grayscale value of the maximum grayscale, j is the grayscale value of each grayscale, gamma jmax is the gamma maximum value corresponding to grayscale j, gamma jmin is the minimum gamma value corresponding to gray level j.

11. A display panel, characterized in that: The display panel includes a memory and a processor coupled to each other, and the processor is used to execute program instructions stored in the memory to implement the method for setting gamma extreme value parameters of the display panel according to any one of claims 1 to 10.

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