Display panel and gamma data determination method and driving method thereof

Abstract

The embodiment of the present application discloses a display panel and a gamma data determination method and a driving method thereof. The gamma data corresponding to the intermediate display brightness level of the target gray scale is determined according to the target gray scale and the target gamma data set, which is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art. The gamma data obtained at the virtual intermediate display brightness level binding point does not need to be adjusted, and can meet the requirements of brightness and color coordinate requirements. Compared with the prior art, the number of display brightness level binding points is small, and the gamma data corresponding to the intermediate display brightness level is obtained by interpolation based on the display brightness level binding points. The color deviation can be improved, the picture display quality can be improved, and the number of actual display brightness level binding points does not need to be increased, and the high gamma adjustment efficiency can still be ensured.

Description

Technical Field

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

[0002] With the development of display technology, users have increasingly higher requirements for the quality of screen display.

[0003] In the existing technology, the display panel can be divided into multiple display brightness levels. When performing gamma adjustment, several of the multiple display brightness levels are generally selected as binding points for gamma adjustment.

[0004] However, existing technologies suffer from severe color distortion in the displayed image at brightness levels between adjacent brightness level binding points. Summary of the Invention

[0005] This invention provides a display panel and its gamma data determination and driving method to reduce the color shift of the displayed image at adjacent display brightness level binding points and improve the display quality.

[0006] In a first aspect, embodiments of the present invention provide a method for determining gamma data of a display panel, comprising:

[0007] Obtain the target gamma data group corresponding to the second display brightness level binding point among the adjacent first display brightness level binding points and second display brightness level binding points; wherein, the brightness corresponding to the second display brightness level binding point is greater than the brightness corresponding to the first display brightness level binding point; the target gamma data group includes multiple gray levels and the gamma data corresponding to the gray levels;

[0008] Determine at least one target grayscale and at least one intermediate display brightness level under the second display brightness level binding point, wherein the target grayscale and the intermediate display brightness level correspond one-to-one, and the brightness of the target grayscale matches the brightness of the corresponding intermediate display brightness level; the intermediate display brightness level is between the first display brightness level binding point and the second display brightness level binding point.

[0009] Based on at least one target grayscale and target gamma data set, determine at least one gamma data corresponding to an intermediate display brightness level corresponding to the target grayscale; the gamma data includes gamma register values ​​or data voltages.

[0010] Optionally, the target gamma data set includes multiple bound-point grayscale values ​​and gamma data corresponding to the bound-point grayscale values;

[0011] Determining at least one target grayscale and at least one intermediate display brightness level under the second display brightness level binding point includes:

[0012] At least one grayscale point corresponding to the brightness between the first brightness and the second brightness is determined as the target grayscale; wherein the first brightness is the brightness corresponding to the first display brightness level, and the second brightness is the brightness corresponding to the second display brightness level;

[0013] Based on the first correspondence between display brightness level and brightness within the target display brightness level range, the display brightness level that matches the brightness corresponding to the target grayscale is determined as the intermediate display brightness level; the target display brightness level range is the range with the first display brightness level binding point and the second display brightness level binding point as the interval endpoints;

[0014] Optionally, based on the correspondence between display brightness levels and brightness within the target display brightness level range, the display brightness level whose brightness difference with the target grayscale is within the set range is determined as the intermediate display brightness level;

[0015] Optionally, based on the correspondence between display brightness levels and brightness within the target display brightness level range, the display brightness level that corresponds to the target grayscale is determined as the intermediate display brightness level.

[0016] Optionally, based on the first correspondence between display brightness levels and brightness within the target display brightness level range, the display brightness level that matches the brightness corresponding to the target grayscale is determined as the intermediate display brightness level, including:

[0017] Based on the brightness corresponding to the second display brightness level binding point and the second correspondence between the grayscale of the second display brightness level binding point and the brightness, determine the brightness corresponding to the target grayscale.

[0018] The intermediate display brightness level that matches the target grayscale is determined based on the brightness corresponding to the target grayscale and the first correspondence.

[0019] Optionally, before acquiring the target gamma data group corresponding to the second display brightness level binding point among adjacent first and second display brightness level binding points, the following steps are included:

[0020] Gamma adjustment is performed on multiple grayscale levels at each display brightness level. The gamma data that satisfies the target brightness and target chromaticity of the grayscale level is determined as the gamma data corresponding to the grayscale level, so as to obtain the gamma data group corresponding to each display brightness level.

[0021] Optionally, based on at least one target grayscale and target gamma data set, determine at least one gamma data corresponding to an intermediate display brightness level of the target grayscale, including:

[0022] The gamma data corresponding to the target grayscale is determined as the gamma data corresponding to the intermediate display brightness level of the target grayscale.

[0023] Optionally, after determining at least one gamma data corresponding to an intermediate display brightness level corresponding to the target grayscale based on at least one target grayscale and target gamma data set, the method further includes:

[0024] Based on the gamma data corresponding to the two adjacent display brightness level binding points, interpolation is used to calculate the gamma data corresponding to other display brightness levels between the two adjacent display brightness level binding points.

[0025] The display brightness level binding points include real binding points and virtual binding points. Real binding points include the first display brightness level binding point and the second display brightness level binding point, while virtual binding points include the intermediate display brightness level.

[0026] Optionally, based on at least one target grayscale and target gamma data set, determine at least one gamma data corresponding to an intermediate display brightness level of the target grayscale, including:

[0027] Based on at least one target grayscale and target gamma data set, determine at least one gamma data corresponding to the maximum grayscale at the intermediate display brightness level corresponding to the target grayscale;

[0028] After determining the gamma data corresponding to the maximum gray level at at least one intermediate display brightness level corresponding to the target gray level based on at least one target gray level and target gamma data set, the method further includes:

[0029] Based on the brightness corresponding to the intermediate display brightness level, determine the brightness corresponding to other gray levels other than the maximum gray level of the intermediate display brightness level;

[0030] Determine the corresponding gray levels of other gray levels at the intermediate display brightness level and the corresponding gray levels at the second display brightness level binding point based on the brightness of other gray levels.

[0031] Assign the gamma data of the grayscale under the second display brightness level binding point to other grayscales under the intermediate display brightness level corresponding to the grayscale under the second display brightness level binding point.

[0032] Optionally, after determining at least one gamma data corresponding to an intermediate display brightness level corresponding to the target grayscale based on at least one target grayscale and target gamma data set, the method further includes:

[0033] Store the gamma data.

[0034] In a second aspect, embodiments of the present invention also provide a display panel, wherein the display panel uses the gamma data determination method of the display panel in the first aspect to determine gamma data;

[0035] Optionally, within the target display brightness level range with the first display brightness level binding point and the second display brightness level binding point as the interval endpoints, the driving data other than the gamma data are the same for each display brightness level;

[0036] Optionally, the display panel includes multiple pixel circuits. Each pixel circuit includes a data writing module, a driving module, and a light-emitting module. The data writing module is used to write corresponding data voltages to the control terminal of the driving module. The driving module and the light-emitting module are connected between the first power line and the second power line. Other driving data includes the first power voltage on the first power line and the second power voltage on the second power line.

[0037] Optionally, the pixel circuit also includes a first initialization module, which is used to write a first initialization voltage to the control terminal of the driving module. Other driving data also include the first initialization voltage.

[0038] Optionally, the pixel circuit also includes a second initialization module, which is used to write a second initialization voltage to the light-emitting module. Other driving data also include the second initialization voltage.

[0039] Optionally, the pixel circuit also includes an emissive control module, which is connected in series with the driving module and the emissive module between the first power line and the second power line. The emissive control module is used to control the conduction state between the first power line and the second power line according to the emissive control signal. Other driving data also include the duty cycle of the emissive control signal.

[0040] Optionally, the display panel may also include a gate driving circuit, and the driving data may also include a clock signal, a power signal, and a start signal connected to the gate driving circuit.

[0041] Thirdly, embodiments of the present invention also provide a method for driving a display panel, comprising:

[0042] The display panel is driven according to the target display brightness level and the gamma data corresponding to the target display brightness level; wherein the gamma data is determined using the gamma data determination method of the display panel in the first aspect.

[0043] The display panel and its gamma data determination and driving method in this embodiment of the invention obtain the target gamma data group corresponding to the second display brightness level binding point among adjacent first display brightness level binding points and second display brightness level binding points, determine at least one target gray level and an intermediate display brightness level matching the target gray level brightness under the second display brightness level binding point; and determine the gamma data corresponding to at least one intermediate display brightness level based on at least one target gray level and target gamma data group. The technical solution of this invention, by determining the gamma data corresponding to the intermediate display brightness level of the target grayscale based on the target grayscale and the target gamma data group, is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art. Under this virtual intermediate display brightness level binding point, gamma data that better meets the brightness and color coordinate requirements can be obtained without gamma adjustment. Compared with the prior art that sets a smaller number of display brightness level binding points and interpolates the gamma data corresponding to the intermediate display brightness level based on the display brightness level binding points, it can improve color shift, enhance the display quality of the picture, and still ensure high gamma adjustment efficiency without increasing the actual number of display brightness level binding points. Attached Figure Description

[0044] Figure 1 It is a curve of color coordinates corresponding to the gamma data of the display brightness levels between DBV1 and DBV284 when interpolating the two display brightness levels using DBV1 and DBV284 as the binding points;

[0045] Figure 2 This invention provides a flowchart of a method for determining gamma data of a display panel;

[0046] Figure 3 This is a flowchart of another method for determining gamma data of a display panel provided in an embodiment of the present invention;

[0047] Figure 4 It displays the gamma curve under the brightness level binding point DBV284;

[0048] Figure 5 It is within the interval where DBV284 and DBV1 are the endpoints;

[0049] Figure 6 This is a graph showing the relationship between the display brightness level and color coordinates between DBV1 and DBV284 when the display panel is driven by the gamma data obtained by the gamma data determination method of the display panel in this embodiment of the invention.

[0050] Figure 7 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0052] As described in the background section, existing technologies suffer from significant color shifts at display brightness levels between adjacent brightness level binding points. The inventors have discovered that this problem arises because, in existing technologies, gamma calibration typically selects several display brightness levels as binding points. For other brightness levels, gamma data is usually calculated through interpolation, such as linear interpolation, based on the gamma data corresponding to the binding points. Due to efficiency requirements in gamma calibration, the number of selected brightness level binding points is limited. Furthermore, the characteristics of different display panels vary, and the gamma data obtained through interpolation cannot perfectly match the panel characteristics, resulting in severe color shifts at display brightness levels between adjacent brightness level binding points. Figure 1 This is a curve showing the color coordinates corresponding to the gamma data of the display brightness levels between DBV1 and DBV284 obtained by interpolation using DBV1 and DBV284 as two display brightness levels as binding points. Among them, Figure 1 The horizontal axis represents the display brightness level, and the vertical axis represents the y-axis of the color coordinate system (CIE-y). Figure 1 It can be seen that when the gamma data corresponding to the display brightness level between the two display brightness level binding points is obtained by interpolation, the y-coordinate in the color coordinate is significantly offset, resulting in severe color distortion when the screen is displayed.

[0053] To address the above problems, embodiments of the present invention provide a flowchart of a method for determining gamma data of a display panel, as shown in the reference. Figure 1 The method for determining the gamma data of the display panel includes:

[0054] Step 110: Obtain the target gamma data group corresponding to the second display brightness level binding point among the adjacent first display brightness level binding points and second display brightness level binding points.

[0055] Specifically, mobile phones, computers, and other display devices typically include brightness adjustment buttons. Users use these buttons to adjust the overall display brightness, with each press corresponding to an input brightness level. Each brightness level corresponds to the brightness of the maximum grayscale level on the display panel. Changing the brightness of the maximum grayscale level will also change the brightness of the other grayscale levels. Specifically, increasing the brightness of the maximum grayscale level increases the brightness of the other grayscale levels; conversely, decreasing the brightness of the maximum grayscale level decreases the brightness of the other grayscale levels.

[0056] During gamma tuning, multiple display brightness level binding points are selected, and gamma tuning is performed under different display brightness level binding points. For example, the number of selected display brightness level binding points is n, optionally an integer greater than or equal to 8 and less than or equal to 12. The selected display brightness level binding points are arranged in ascending order of their corresponding brightness as DBV1, DBV2...DBVn, where DBVi and DBV(i+1) are two adjacent display brightness level binding points, and n is a positive integer greater than or equal to 1 and less than or equal to n-1. For any two adjacent display brightness level binding points, the one corresponding to the lower brightness is designated as the first display brightness level binding point, and the one corresponding to the higher brightness is designated as the second display brightness level binding point. That is, the brightness corresponding to the second display brightness level binding point is greater than the brightness corresponding to the first display brightness level binding point. For example, in DBVi and DBV(i+1), DBVi is the first display brightness level binding point, and DBV(i+1) is the second display brightness level binding point. Here, the brightness corresponding to the display brightness level is the brightness corresponding to the maximum grayscale level at that display brightness level. Correspondingly, the brightness corresponding to the display brightness level binding point is the brightness corresponding to the maximum grayscale level at that display brightness level binding point.

[0057] Gamma adjustment is performed at each display brightness level binding point. During gamma adjustment, multiple binding point grayscales can be selected to obtain the gamma data corresponding to each binding point grayscale. This results in a gamma data set for each display brightness level binding point, comprising multiple grayscales and their corresponding gamma data. In this step, for any two adjacent display brightness level binding points, the gamma data set corresponding to the second display brightness level is obtained as the target gamma data set.

[0058] Step 120: Determine at least one target grayscale and at least one intermediate display brightness level under the second display brightness level binding point, wherein the target grayscale and the intermediate display brightness level correspond one-to-one, and the brightness of the target grayscale matches the brightness of the corresponding intermediate display brightness level; the intermediate display brightness level is between the first display brightness level binding point and the second display brightness level binding point.

[0059] Because multiple grayscale levels are selected for gamma adjustment under each display brightness level binding point, within the display brightness level interval with the first and second display brightness level binding points as endpoints, the brightness corresponding to the second display brightness level binding point is the highest. That is, within this display brightness level interval, the maximum grayscale level corresponding to the second display brightness level binding point has the highest brightness. Therefore, under the second display brightness level, at least one target grayscale can be selected. The brightness corresponding to this target grayscale matches the brightness of the intermediate display brightness level, which is lower than the brightness of the second display brightness level binding point. In some optional embodiments of this invention, matching the brightness of the target grayscale with the brightness of the intermediate display brightness level can mean that the difference between the brightness of the target grayscale and the brightness of the intermediate display brightness level is less than a set threshold. The difference in brightness can be a difference in brightness, a ratio, or a value obtained based on other preset algorithms. This embodiment of the invention does not specifically limit this.

[0060] Step 130: Based on at least one target grayscale and target gamma data group, determine at least one gamma data corresponding to an intermediate display brightness level corresponding to the target grayscale; the gamma data includes gamma register value or data voltage.

[0061] Specifically, after the target grayscale is determined, the gamma data corresponding to the target grayscale can be determined based on the target grayscale and the target gamma data set. Then, the gamma data corresponding to the intermediate display brightness level corresponding to the target grayscale can be determined based on the gamma data. The gamma data can include gamma register values ​​or data voltages. The gamma register contains the internal register values ​​of the display panel's driver chip, while the data voltage is the data voltage supplied to the pixel circuits in the display panel.

[0062] As mentioned above, during gamma tuning, multiple grayscale levels are set for each display brightness level binding point. Gamma tuning requires meeting the brightness and color coordinate requirements corresponding to the binding point grayscale. Therefore, the gamma data corresponding to the binding point grayscale determined at each display brightness level binding point can guarantee the display effect at that binding point grayscale. Since the number of binding point grayscales is relatively large, the gamma data calculated from the gamma data corresponding to the binding point grayscale will also generally conform to the corresponding brightness and color coordinate requirements. Therefore, in this embodiment, by determining the gamma data corresponding to the intermediate display brightness level of the target grayscale based on the target grayscale and the target gamma data group, it is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art. Under this virtual intermediate display brightness level binding point, gamma adjustment is not required, and gamma data that better meets the brightness and color coordinate requirements can be obtained. Compared with the prior art, which sets a smaller number of display brightness level binding points and interpolates the gamma data corresponding to the intermediate display brightness level based on the display brightness level binding points, color shift can be improved, the display quality of the picture can be improved, and high gamma adjustment efficiency can still be guaranteed without increasing the actual number of display brightness level binding points.

[0063] Optionally, after step 130 above, the method further includes: storing the gamma data. After storing the gamma data, when driving the display panel, the gamma data corresponding to the display brightness level can be directly used.

[0064] The gamma data determination method for the display panel in this embodiment obtains the target gamma data group corresponding to the second display brightness level binding point from among adjacent first and second display brightness level binding points. It then determines at least one target grayscale and an intermediate display brightness level matching the target grayscale brightness under the second display brightness level binding point. Based on the at least one target grayscale and the target gamma data group, it determines the gamma data corresponding to at least one intermediate display brightness level. This embodiment's technical solution, by determining the gamma data corresponding to the intermediate display brightness level based on the target grayscale and the target gamma data group, is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art. Under this virtual intermediate display brightness level binding point, gamma data that better meets the brightness and color coordinate requirements can be obtained without gamma adjustment. Compared to the prior art which sets a smaller number of display brightness level binding points and interpolates the gamma data corresponding to the intermediate display brightness level based on these binding points, it can improve color shift and enhance image display quality. Furthermore, it does not require increasing the actual number of display brightness level binding points, thus maintaining high gamma adjustment efficiency.

[0065] Based on the above technical solution, optionally, the target gamma data group includes multiple bound point gray levels and gamma data corresponding to the bound point gray levels.

[0066] Figure 3 This is a flowchart of another method for determining gamma data of a display panel provided in an embodiment of the present invention, see reference. Figure 3 Optionally, the method for determining the gamma data of the display panel includes:

[0067] Step 210: Perform gamma adjustment on multiple grayscale points at each display brightness level. Determine the gamma data that satisfies the target brightness and target chromaticity corresponding to the grayscale point as the gamma data corresponding to the grayscale point, so as to obtain the gamma data group corresponding to each display brightness level.

[0068] The gamma data set corresponding to the display brightness level includes multiple bound-point grayscales and the gamma data corresponding to each bound-point grayscale. The gamma data corresponding to other grayscales besides the bound-point grayscales can be calculated by interpolation based on the gamma data corresponding to the bound-point grayscales. During gamma adjustment at the bound-point grayscales, the display panel can be driven to display the image corresponding to the bound-point grayscale. Then, the brightness and color coordinates of the displayed image are adjusted by adjusting the gamma data. The gamma data at which the target brightness and target color coordinates corresponding to the bound-point grayscale are obtained. The display panel can include sub-pixels of various emitting colors. Sub-pixels of different emitting colors can be gamma-adjusted separately to obtain the corresponding gamma data for the bound-point grayscales. For example, when the display panel includes red, green, and blue sub-pixels, the gamma data sets corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel at each display brightness level can be obtained respectively. In subsequent steps, when processing the gamma data corresponding to the intermediate display brightness level, the gamma data corresponding to different colored sub-pixels at the intermediate display brightness level can also be determined based on the different colored sub-pixels.

[0069] Step 220: Obtain the target gamma data group corresponding to the second display brightness level binding point among the adjacent first display brightness level binding points and second display brightness level binding points; this step is the same as the process of step 110 in the above embodiment, and will not be described again here.

[0070] Step 230: Determine at least one binding point grayscale corresponding to the brightness between the first brightness and the second brightness as the target grayscale; wherein the first brightness is the brightness corresponding to the first display brightness level, and the second brightness is the brightness corresponding to the second display brightness level.

[0071] As described above, multiple gray levels are set for gamma adjustment under each display brightness level binding point. When performing gamma adjustment, the brightness and color coordinate requirements corresponding to the binding point gray level need to be met. In this embodiment, the binding point gray level is determined as the target gray level, so that when the gamma data corresponding to the intermediate display brightness level is determined according to the target gray level, the brightness of the screen at the intermediate display brightness level is accurate and the color coordinate offset is also improved.

[0072] Step 240: Based on the first correspondence between display brightness level and brightness within the target display brightness level range, determine the display brightness level that matches the brightness corresponding to the target grayscale as the intermediate display brightness level; the target display brightness level range is the range with the first display brightness level binding point and the second display brightness level binding point as the interval endpoints.

[0073] In some optional embodiments of the present invention, the display brightness level within a set range of brightness differences corresponding to the target grayscale can be determined as an intermediate display brightness level based on the correspondence between display brightness levels and brightness within the target display brightness level range. In another optional embodiment of the present invention, the display brightness level equal to the brightness corresponding to the target grayscale can be determined as an intermediate display brightness level based on the correspondence between display brightness levels and brightness within the target display brightness level range.

[0074] Optionally, step 240 above may include:

[0075] Based on the brightness corresponding to the second display brightness level binding point and the second correspondence between grayscale and brightness under the second display brightness level binding point, the brightness corresponding to the target grayscale is determined; based on the brightness corresponding to the target grayscale and the first correspondence, the intermediate display brightness level matching the target grayscale is determined.

[0076] As mentioned above, the brightness corresponding to the second display brightness level binding point is the brightness corresponding to the maximum grayscale level under the second display brightness level binding point. Under the second display brightness level binding point, the brightness corresponding to other grayscale levels besides the maximum grayscale level can be obtained according to the preset algorithm and the brightness corresponding to the maximum grayscale level. The preset algorithm is obtained based on the gamma curve satisfied by the display panel. Figure 4 This is the gamma curve under the DBV284 brightness level binding point, where the horizontal axis represents grayscale (Gray) and the vertical axis represents brightness (Lv), with units of nits. The maximum grayscale value of 255 under DBV284 corresponds to a brightness of 7 nits. For example, when the standard gamma curve is met (where the exponent parameter for calculating the corresponding brightness based on grayscale is 2.2 under the standard gamma curve), the brightness corresponding to the target grayscale can be calculated using the following formula. Lv i Lv represents the brightness corresponding to the target grayscale. DBVThis indicates the brightness corresponding to the binding point of the display brightness level (that is, the brightness corresponding to the maximum gray level at this display brightness level). Grayi represents the target gray level, and Graymax represents the maximum gray level. For example, if there are three target gray levels, namely the binding point gray levels 232, 207, and 175, the brightness corresponding to gray level 232 is (7*(239 / 255)^2.2)=6.07nit, and the corresponding brightness levels of gray levels 207 and 175 are 4.424nit and 3.058nit, respectively.

[0077] Figure 5 This is a graph showing the relationship between display brightness level and brightness within the interval with DBV284 and DBV1 as the endpoints. The maximum gray level 255 under DBV1 corresponds to a brightness of 2 nits. The horizontal axis represents the display brightness level DBV, and the vertical axis represents the brightness Lv, with the unit being nits. Figure 5 The illustration shows an example of brightness varying linearly with display brightness levels. After determining the brightness corresponding to the target grayscale, this brightness can be substituted into the first correspondence between display brightness levels and brightness to determine the display brightness level that corresponds to the target grayscale brightness as the intermediate display brightness level. Specifically, DBV284 and DBV1 are adjacent display brightness level binding points; of these two binding points, DBV1 is the first display brightness level binding point, and DBV284 is the second display brightness level binding point. Figure 5 Taking the linear change in brightness with display brightness level as an example, the brightness at the intermediate display brightness level DBV232 is: If the brightness of grayscale 232 under DBV284 is equal to that of grayscale 232 under DBV284, then the intermediate display brightness level corresponding to grayscale 232 under DBV284 is DBV232. Correspondingly, the intermediate display brightness level corresponding to grayscale 207 under DBV284 is DBV138, and the intermediate display brightness level corresponding to grayscale 175 under DBV284 is DBV61.

[0078] Step 250: Determine the gamma data corresponding to the target grayscale as the gamma data corresponding to the intermediate display brightness level of the target grayscale.

[0079] During gamma debugging, under each binding point of display brightness level, multiple binding point grayscales are set for gamma debugging. Gamma debugging needs to meet the requirements of brightness and color coordinates corresponding to the binding point grayscales. Therefore, the gamma data corresponding to the binding point grayscales determined under each binding point of display brightness level can ensure the display effect corresponding to the binding point grayscales. Since the number of binding point grayscales is relatively large, the gamma data for other grayscales calculated based on the gamma data corresponding to the binding point grayscales will also relatively meet the corresponding requirements of brightness and color coordinates. Therefore, in this embodiment, determining the gamma data corresponding to the target grayscale as the gamma data corresponding to the intermediate display brightness level corresponding to the target grayscale is equivalent to inserting a virtual intermediate display brightness level binding point between two adjacent display brightness level binding points in the prior art. Gamma debugging is not required under this virtual intermediate display brightness level binding point, and gamma data that better meets the requirements of brightness and color coordinates can be obtained. Compared with the prior art where a small number of display brightness level binding points are set and the gamma data corresponding to the intermediate display brightness level is obtained through interpolation based on the display brightness level binding points, the present invention can improve color shift, enhance picture display quality, does not need to increase the actual number of display brightness level binding points, and can still ensure high gamma debugging efficiency. Moreover, directly determining the gamma data corresponding to the target grayscale as the gamma data corresponding to the intermediate display brightness level corresponding to the target grayscale can obtain the gamma data corresponding to the intermediate display brightness level without additional calculations, thereby improving the efficiency of the gamma data determination method. In addition, since gamma debugging is performed at the binding point grayscale, when the target grayscale is equal to the binding point grayscale, the step of interpolating to determine the gamma data corresponding to the target grayscale when other grayscales except the binding point grayscale are determined as the target grayscale is reduced, so that the color shift of the display picture under the gamma data corresponding to the intermediate display brightness level is smaller, and the brightness is also more matched.

[0080] Figure 6 It is a graph of the relationship between display brightness levels and color coordinates between DBV1 and DBV284 when the display panel is driven by gamma data obtained by the gamma data determination method for display panels according to an embodiment of the present invention. Wherein, the brightness corresponding to DBV1 is equal to the brightness corresponding to 145 grayscale under DBV284. A plurality of intermediate display brightness levels are randomly determined between DBV1 and DBV284, Figure 6 three intermediate display brightness levels are schematically shown, namely DBVa, DBVb and DBV232, wherein a < b < 232. According to the gamma data determination method of the above embodiments of the present invention, it can be found that the corresponding grayscale of DBV232 under DBV284 is 239 grayscale (i.e. Figure 6 239gray in), the corresponding grayscale of DBVb under DBV284 is q grayscale (i.e. Figure 6 grayq in), the corresponding grayscale of DBVa under DBV284 is p grayscale (i.e. Figure 6in grayp), where p<q<239. With reference to Figure 6 , it can be seen that when the display panel is driven by gamma data obtained by the gamma data determining method for a display panel according to the embodiment of the present invention, the color coordinate shift at the intermediate display brightness level corresponding to the target gray scales (239, grayp and grayq) under the second display brightness level binding point DBV284 is pulled back to normal, so that color shift can be improved, and the color shift at each intermediate display brightness level between DBV1 and DBV284 is relatively small.

[0081] Based on the above embodiments, optionally, after the foregoing step 130 and step 250, the method further comprises: performing interpolation calculation on gamma data corresponding to other display brightness levels between two adjacent display brightness level binding points according to gamma data corresponding to the two adjacent display brightness level binding points; wherein the display brightness level binding points comprise real binding points and virtual binding points, the real binding points comprise a first display brightness level binding point and a second display brightness level binding point, and the virtual binding points comprise intermediate display brightness levels. Specifically, the intermediate display brightness level included in the virtual binding point is the intermediate display brightness level matched with the target gray scale brightness determined in the foregoing embodiment.

[0082] In this embodiment, since the gamma data corresponding to the virtual binding point (that is, the intermediate display brightness level corresponding to the target gray scale) can improve color shift compared with the prior art, when gamma data corresponding to other display brightness levels between two adjacent display brightness level binding points is calculated according to the difference of adjacent display brightness level binding points including real binding points and virtual binding points, the color shift of the display screen under other display brightness levels can also be improved.

[0083] Based on the above embodiments, optionally, the foregoing step 130 may comprise: determining gamma data corresponding to the maximum gray scale at the intermediate display brightness level corresponding to at least one target gray scale according to at least one target gray scale and a target gamma data group. For example, the gamma data corresponding to the target gray scale may be determined from the target gray scale and the target gamma data group; then the gamma data corresponding to the target gray scale is determined as the gamma data corresponding to the maximum gray scale at the intermediate display brightness level.

[0084] Optionally, after determining gamma data corresponding to a maximum gray scale at an intermediate display brightness level corresponding to at least one target gray scale according to the at least one target gray scale and a target gamma data group, the method further comprises:

[0085] Based on the brightness corresponding to the intermediate display brightness level, determine the brightness corresponding to other gray levels other than the maximum gray level of the intermediate display brightness level; based on the brightness corresponding to other gray levels, determine the gray levels corresponding to other gray levels under the intermediate display brightness level under the second display brightness level binding point; assign the gamma data of the gray levels under the second display brightness level binding point to the other gray levels under the intermediate display brightness level corresponding to the gray levels under the second display brightness level binding point.

[0086] Specifically, based on the brightness corresponding to the intermediate display brightness level, the brightness corresponding to other gray levels besides the maximum gray level of the intermediate display brightness level is determined. That is, based on the brightness corresponding to the maximum gray level under the intermediate display brightness level, the brightness corresponding to other gray levels under the intermediate display brightness level is determined. This can be determined based on the gamma curve satisfied by the display panel. After determining the brightness corresponding to other gray levels under the intermediate display brightness level, the gray level whose brightness is equal to that of the other gray levels under the intermediate display brightness level is found under the second display brightness level binding point. The gamma data corresponding to this gray level is then assigned to the other gray levels under the intermediate display brightness level corresponding to the gray level under the second display brightness level binding point, thereby improving the color shift at the other gray levels under the intermediate display brightness level.

[0087] Based on the above embodiments, optionally, within the target display brightness level range with the first display brightness level binding point and the second display brightness level binding point as the interval endpoints, all driving data except gamma data are the same at each display brightness level, thereby eliminating the influence of other driving data besides gamma data, ensuring that when at least one gamma data corresponding to the intermediate display brightness level corresponding to the target gray level is determined based on at least one target gray level and target gamma data group, the display effect of the display panel is improved.

[0088] This invention also provides a display panel that uses the gamma data determination method of any of the above embodiments of the present invention to determine gamma data.

[0089] Optionally, the display panel includes multiple pixel circuits. Figure 7 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention, for reference. Figure 7 Optionally, the pixel circuit includes a data writing module 310, a driving module 320, and a light-emitting module 330. The data writing module 310 is used to write the corresponding data voltage Data to the control terminal of the driving module 320. The driving module 320 and the light-emitting module 330 are connected between the first power line VDD and the second power line VSS. Other driving data include the first power supply voltage on the first power line VDD and the second power supply voltage on the second power line VSS.

[0090] Optionally, the pixel circuit also includes a first initialization module 340, which is used to write a first initialization voltage Vref1 to the control terminal of the driving module 320. Other driving data also include the first initialization voltage Vref1.

[0091] Optionally, the pixel circuit also includes a second initialization module 350, which is used to write a second initialization voltage Vref2 to the light-emitting module 330. Other driving data also include the second initialization voltage Vref2.

[0092] Optionally, the pixel circuit also includes an emissive control module 360, which is connected in series with the driving module 320 and the emissive module 330 between the first power line VDD and the second power line VSS. The emissive control module 360 ​​is used to control the conduction state between the first power line VDD and the second power line VSS according to the emissive control signal EM. Other driving data also include the duty cycle of the emissive control signal EM.

[0093] Optionally, the display panel also includes a gate driving circuit, and the driving data includes a clock signal, a power signal, and a start signal input to the gate driving circuit. The gate driving circuit includes a scanning circuit and a light-emitting control driving circuit. The scanning circuit generates a scanning signal based on the clock signal, the power signal, and the start signal. Figure 7 In the pixel circuit shown, the first scan signal Scan1 and the second scan signal Scan2 can be generated by the scanning circuit. The light emission control circuit is used to generate signals based on the clock signal, power signal, and start signal. Figure 7 The light-emitting control module 360 ​​shown is connected to the light-emitting control signal EM. The clock signals connected to the scanning circuit and the light-emitting control circuit can be the same or different; the power signals connected to the scanning circuit and the light-emitting control circuit can be the same or different; and the power signals connected to the scanning circuit and the light-emitting control circuit can be different.

[0094] This invention also provides a method for driving a display panel, which includes driving the display panel according to a target display brightness level and gamma data corresponding to the target display brightness level; wherein the gamma data is determined using the gamma data determination method for display panels in any of the above embodiments of this invention. Accordingly, when driving the display panel using the method of this embodiment, the color shift of the display panel can be improved at the intermediate display brightness level between the first display brightness level binding point and the second display brightness level binding point.

[0095] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for determining gamma data of a display panel, characterized in that, include: Among adjacent first and second display brightness level binding points, obtain the target gamma data group corresponding to the second display brightness level binding point; wherein the brightness corresponding to the second display brightness level binding point is greater than the brightness corresponding to the first display brightness level binding point; the target gamma data group includes multiple gray levels and the gamma data corresponding to the gray levels. Determine at least one target grayscale and at least one intermediate display brightness level under the second display brightness level binding point, wherein the target grayscale and the intermediate display brightness level correspond one-to-one, and the brightness of the target grayscale matches the brightness of the corresponding intermediate display brightness level; the intermediate display brightness level is between the first display brightness level binding point and the second display brightness level binding point. Based on at least one target grayscale and the target gamma data group, at least one gamma data corresponding to an intermediate display brightness level of the target grayscale is determined; the gamma data includes a gamma register value or a data voltage; the target gamma data group includes multiple bound-point grayscales and gamma data corresponding to the bound-point grayscales. Determining at least one target grayscale and at least one intermediate display brightness level under the second display brightness level binding point includes: The target grayscale is determined by at least one of the binding point grayscales corresponding to the brightness between the first brightness and the second brightness; wherein the first brightness is the brightness corresponding to the first display brightness level, and the second brightness is the brightness corresponding to the second display brightness level; Based on the first correspondence between the display brightness level and the brightness within the target display brightness level range, the display brightness level that matches the brightness corresponding to the target grayscale is determined as the intermediate display brightness level; the target display brightness level range is the range with the first display brightness level binding point and the second display brightness level binding point as the interval endpoints; Before acquiring the target gamma data group corresponding to the second display brightness level binding point in the process of acquiring adjacent first and second display brightness level binding points, the process includes: Gamma adjustment is performed on multiple grayscale levels of the binding points under each of the display brightness levels. The gamma data that satisfies the target brightness and target chromaticity corresponding to the grayscale level of the binding point is determined as the gamma data corresponding to the grayscale level of the binding point, so as to obtain the gamma data group corresponding to each display brightness level. The number of selected display brightness level binding points is n, where n is an integer greater than or equal to 8 and less than or equal to 12.

2. The method for determining gamma data of a display panel according to claim 1, characterized in that, Based on the correspondence between the display brightness level and the brightness within the target display brightness level range, the display brightness level whose brightness difference with the target grayscale is within a set range is determined as the intermediate display brightness level.

3. The method for determining gamma data of a display panel according to claim 1, characterized in that, Based on the correspondence between the display brightness level and the brightness within the target display brightness level range, the display brightness level that corresponds to the brightness of the target grayscale is determined as the intermediate display brightness level.

4. The method for determining gamma data of a display panel according to claim 1, characterized in that, The step of determining the intermediate display brightness level as the display brightness level that matches the brightness corresponding to the target grayscale based on the first correspondence between the display brightness level and the brightness within the target display brightness level range includes: Based on the brightness corresponding to the second display brightness level binding point, and the second correspondence between grayscale and brightness under the second display brightness level binding point, the brightness corresponding to the target grayscale is determined; The intermediate display brightness level that matches the target grayscale is determined based on the brightness corresponding to the target grayscale and the first correspondence.

5. The method for determining gamma data of a display panel according to claim 1, characterized in that, The step of determining at least one gamma data corresponding to an intermediate display brightness level of the target grayscale based on at least one target grayscale and the target gamma data group includes: The gamma data corresponding to the target grayscale is determined as the gamma data corresponding to the intermediate display brightness level of the target grayscale.

6. The method for determining gamma data of a display panel according to claim 1, characterized in that, After determining at least one gamma data corresponding to an intermediate display brightness level of the target grayscale based on at least one target grayscale and the target gamma data set, the method further includes: Based on the gamma data corresponding to the two adjacent display brightness level binding points, interpolation is used to calculate the gamma data corresponding to other display brightness levels between the two adjacent display brightness level binding points. The display brightness level binding points include real binding points and virtual binding points. The real binding points include a first display brightness level binding point and a second display brightness level binding point, and the virtual binding points include the intermediate display brightness level.

7. The method for determining gamma data of a display panel according to claim 1, characterized in that, Based on at least one target grayscale and the target gamma data set, determine at least one gamma data corresponding to an intermediate display brightness level of the target grayscale, including: Based on at least one target grayscale and the target gamma data group, determine at least one gamma data corresponding to the maximum grayscale at the intermediate display brightness level corresponding to the target grayscale; After determining the gamma data corresponding to the maximum gray level at at least one intermediate display brightness level corresponding to the target gray level based on at least one target gray level and the target gamma data group, the method further includes: Based on the brightness corresponding to the intermediate display brightness level, determine the brightness corresponding to other gray levels other than the maximum gray level of the intermediate display brightness level; Based on the brightness corresponding to the other gray levels, determine the gray levels corresponding to the other gray levels at the intermediate display brightness level at the second display brightness level binding point; The gamma data of the grayscale under the second display brightness level binding point is assigned to other grayscales under the intermediate display brightness level corresponding to the grayscale under the second display brightness level binding point.

8. The method for determining gamma data of a display panel according to claim 1, characterized in that, After determining at least one gamma data corresponding to an intermediate display brightness level of the target grayscale based on at least one target grayscale and the target gamma data set, the method further includes: The gamma data is stored.

9. A display panel, characterized in that, The gamma data is determined using the gamma data determination method for the display panel according to any one of claims 1-8.

10. The display panel according to claim 9, characterized in that, Within the target display brightness level range with the first display brightness level binding point and the second display brightness level binding point as the interval endpoints, the driving data other than the gamma data are the same for each display brightness level.

11. The display panel according to claim 10, characterized in that, The display panel includes multiple pixel circuits, each pixel circuit including a data writing module, a driving module, and a light-emitting module. The data writing module is used to write the corresponding data voltage to the control terminal of the driving module. The driving module and the light-emitting module are connected between a first power line and a second power line. The other driving data includes a first power voltage on the first power line and a second power voltage on the second power line.

12. The display panel according to claim 11, characterized in that, The pixel circuit further includes a first initialization module, which is used to write a first initialization voltage to the control terminal of the driving module. The other driving data also includes the first initialization voltage.

13. The display panel according to claim 11, characterized in that, The pixel circuit further includes a second initialization module, which is used to write a second initialization voltage to the light-emitting module. The other driving data also includes the second initialization voltage.

14. The display panel according to claim 11, characterized in that, The pixel circuit further includes a light emission control module, which is connected in series with the driving module and the light emission module between the first power line and the second power line. The light emission control module is used to control the conduction state between the first power line and the second power line according to the light emission control signal. The other driving data also includes the duty cycle of the light emission control signal.

15. The display panel according to claim 10, characterized in that, The display panel further includes a gate driving circuit, and the driving data also includes a clock signal, a power signal, and a start signal connected to the gate driving circuit.

16. A driving method for a display panel, characterized in that, include: The display panel is driven according to the target display brightness level and the gamma data corresponding to the target display brightness level; wherein the gamma data is determined by the gamma data determination method of the display panel according to any one of claims 1-8.

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