Brightness compensation method for display devices and display devices

Abstract

The application provides a display device brightness compensation method and a display device. The compensation method of the display device comprises the following steps: obtaining a target display frequency and a target display gray scale of a display panel of the display device; obtaining an initial compensation coefficient according to the target display frequency and the target display gray scale; obtaining initial compensation data according to the target display gray scale and a reference display frequency; calculating target compensation data according to the initial compensation coefficient and the initial compensation data; and compensating the display panel based on the target compensation data. In the compensation method provided by the application, the target compensation data calculated according to the initial compensation coefficient and the initial compensation data is used to compensate the display panel, so that the display panel can display the same or similar brightness when displaying the corresponding target compensation data at different target display frequencies with the same target display gray scale.

Description

Technical Field

[0001] This application relates to the field of display technology, and specifically to a brightness compensation method and display device for a display device. Background Technology

[0002] Because the discharge time of the liquid crystal capacitor is different at different display frequencies, the rotation angle of the liquid crystal molecules in the display panel is different. The different rotation angle of the liquid crystal molecules will lead to different light transmittance, and thus the brightness performance of the liquid crystal display panel will be different at different display frequencies.

[0003] To solve the problem of inconsistent brightness of display panels at different display frequencies, the current common practice is to manually adjust the brightness of LCD panels at different display frequencies. However, this adjustment method is cumbersome and the process is complicated. Summary of the Invention

[0004] This application provides a brightness compensation method and a display device to improve the phenomenon of inconsistent brightness of the display panel at different display frequencies.

[0005] In a first aspect, this application provides a brightness compensation method for a display device, comprising:

[0006] Obtain the target display frequency of the display panel of the display device;

[0007] Obtain the target display grayscale of the display panel;

[0008] An initial compensation coefficient is obtained based on the target display frequency and the target display grayscale, wherein the initial compensation coefficient corresponds one-to-one with the target display frequency and the first binding point grayscale;

[0009] Initial compensation data is obtained based on the target display grayscale and the reference display frequency;

[0010] The target compensation data is calculated based on the initial compensation coefficient and the initial compensation data.

[0011] The display panel is compensated based on the target compensation data.

[0012] In the brightness compensation method for a display device provided in this application, the step of calculating the target compensation data based on the initial compensation coefficient and the initial compensation data includes:

[0013] The target compensation coefficient is calculated based on the target display grayscale and the initial compensation coefficient.

[0014] The target compensation data is calculated based on the initial compensation data and the target compensation coefficient.

[0015] In the brightness compensation method for the display device provided in this application, the step of calculating the target compensation coefficient based on the target display grayscale and the initial compensation coefficient includes:

[0016] Compare the grayscale value of the target display grayscale with the grayscale value of the first binding point grayscale;

[0017] Based on the comparison result of the grayscale value of the first binding point grayscale being equal to the grayscale value of the target display grayscale, the initial compensation coefficient is assigned the target compensation coefficient.

[0018] In the brightness compensation method for the display device provided in this application, the step of calculating the target compensation coefficient based on the target display grayscale and the initial compensation coefficient further includes:

[0019] Based on the comparison result that the grayscale value of the first binding point grayscale is not equal to the grayscale value of the target display grayscale, the target compensation coefficient is calculated using the first binding point grayscale, the target display grayscale, and the initial compensation coefficient.

[0020] In the brightness compensation method for a display device provided in this application, the step of calculating the target compensation data based on the initial compensation data and the target compensation coefficient includes:

[0021] The target compensation data is calculated based on the first preset relation, the initial compensation data, and the target compensation coefficient. The first preset relation is: D tc =A t *D c ;

[0022] Among them, D tc For the target compensation data, A t Let D be the target compensation coefficient. c The initial compensation data is referred to here.

[0023] In the brightness compensation method for the display device provided in this application, the step of obtaining initial compensation data based on the target display grayscale and the reference display frequency includes:

[0024] The initial compensation data is calculated based on the target display grayscale, the second binding point grayscale, and the preset compensation data, wherein the preset compensation data corresponds one-to-one with the second binding point grayscale and the reference display frequency.

[0025] In the brightness compensation method for the display device provided in this application, the step of obtaining the initial compensation coefficient based on the target display frequency and the target display grayscale includes:

[0026] An initial compensation coefficient is obtained from multiple preset compensation coefficients based on the target display frequency and the target display grayscale, wherein the preset compensation coefficient corresponds one-to-one with the preset display frequency and the first binding point grayscale.

[0027] The brightness compensation method for the display device provided in this application further includes, before the step of obtaining an initial compensation coefficient from a plurality of preset compensation coefficients based on the target display frequency and the target display grayscale:

[0028] The first brightness value of the first display area of ​​the display panel is obtained when the first display area displays the grayscale of the first bound point at the preset display frequency, and the second brightness value of the second display area of ​​the display panel is obtained when the second display area displays the grayscale of the first bound point at the reference display frequency, wherein the first display area and the second display area are arranged along the scan line arrangement direction of the display panel;

[0029] The preset compensation coefficient is calculated based on the second preset formula, the first brightness value, and the second brightness value. The second preset formula is: A1 = L1 / L2, where A1 is the preset compensation coefficient, L1 is the first brightness value, and L2 is the second brightness value.

[0030] Secondly, this application also provides a display device, comprising:

[0031] Display panel;

[0032] A target display frequency acquisition module, wherein the target display frequency acquisition module is used to acquire the target display frequency of the display panel;

[0033] A target display grayscale acquisition module is used to acquire the target display grayscale of the display panel.

[0034] The compensation storage module is used to store a preset display frequency, a first binding point grayscale, and preset compensation coefficients that correspond one-to-one with the preset display frequency and the first binding point grayscale, and to store a reference display frequency, a second binding point grayscale, and preset compensation data that correspond one-to-one with the reference display frequency and the second binding point grayscale.

[0035] The compensation module is used to obtain initial compensation coefficients and initial compensation data from the compensation storage module based on the target display grayscale, the target display frequency, and the reference display frequency; calculate target compensation data based on the initial compensation coefficients and the initial compensation data; and compensate the display panel based on the target compensation data.

[0036] In the display device provided in this application, the grayscale values ​​of the first binding point grayscale and the second binding point grayscale stored in the compensation storage module are the same.

[0037] The brightness compensation method for the display device provided in this application compensates the display panel based on the target compensation data calculated from the initial compensation coefficient and the initial compensation data. As a result, the display panel displays based on the target compensation data. Since the target compensation coefficients corresponding to the same target display grayscale are not the same for different target display frequencies, the display panel can achieve the same or nearly the same brightness when displaying the same target display grayscale at different target display frequencies with corresponding target compensation data. This automatically adjusts the brightness of the display panel when displaying the same target display grayscale at different target display frequencies, thereby improving the brightness consistency of the display panel when displaying the same target display grayscale at different target display frequencies. Attached Figure Description

[0038] Figure 1 A schematic diagram of a first flow of a brightness compensation method for a display device provided in an embodiment of this application;

[0039] Figure 2 for Figure 1 A flowchart of step S104 in the process;

[0040] Figure 3 for Figure 1 A flowchart of step S105 in the process;

[0041] Figure 4 for Figure 3 A flowchart of step S1051 in the process;

[0042] Figure 5 for Figure 1 A flowchart of step S103 in the process;

[0043] Figure 6 for Figure 1 A schematic diagram of the planar structure of the display panel of the display device in the image;

[0044] Figure 7 for Figure 6 A schematic diagram of the display area of ​​the display panel in the image;

[0045] Figure 8 A schematic diagram of the compensation coefficient lookup table

[0046] Figure 9 This is a block diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. The described embodiments are only used to explain the ideas of the present invention and should not be regarded as limiting the scope of protection of this application.

[0048] In some embodiments provided in this application, such as Figure 1 As shown, the brightness compensation method 100 of the display device includes steps S101, S102, S103, S104, S105 and S106.

[0049] In step S101, the target display frequency of the display panel of the display device is obtained.

[0050] Step S101 specifically involves obtaining the target display frequency of the display panel based on the data to be displayed on the display panel. The data to be displayed includes the target display frequency of the display panel and the target display grayscale corresponding to the image to be displayed on the display panel.

[0051] The display frequency of a display panel, also known as the display frame rate or refresh rate, refers to the number of times the image displayed on the display panel is refreshed per second. Generally, the preset display frequency of a display panel can include, but is not limited to, 60 Hz, 120 Hz, and 180 Hz. For example, when the display frequency of the display panel is 60 Hz, it means that the display panel 201 refreshes the image displayed on the display panel once every 16.6 milliseconds (16.6 milliseconds = 1000 milliseconds / 60).

[0052] In step S101, it is necessary to determine the specific value of the target display frequency of the display panel from the preset display frequencies. Common preset display frequencies of display panels are 60 Hz, 120 Hz, and 180 Hz. Therefore, step S101 needs to determine which of these three frequencies is the target display frequency of the display panel: 60 Hz, 120 Hz, and 180 Hz.

[0053] In step S102, the target display grayscale of the display panel is obtained.

[0054] Step S102 specifically involves obtaining the target display grayscale of the display panel based on the data to be displayed. The data to be displayed includes the target display frequency of the display panel and the target display grayscale corresponding to the image to be displayed. In step S102, it is necessary to determine the specific value of the target display grayscale corresponding to the image to be displayed, that is, to determine the target display grayscale of the image to be displayed for each pixel unit.

[0055] Taking an 8-bit grayscale display range as an example, the brightness of the display panel can be divided into 256 grayscale levels (L0 to L255) from the darkest to the brightest. The darkest grayscale is L0, and the brightest grayscale is L255. Therefore, the range of grayscale levels to be displayed on the display panel is L0 to L255. Step S104 determines which of the grayscale levels L0 to L255 corresponds to the target display grayscale level of the image to be displayed on the display panel.

[0056] In step S103, an initial compensation coefficient is obtained based on the target display frequency and the target display grayscale, wherein the initial compensation coefficient corresponds one-to-one with the target display frequency and the grayscale of the first binding point.

[0057] The first binding point grayscale is a grayscale preset by those skilled in the art based on the grayscale range of the grayscale to be displayed on the display panel. This embodiment does not specifically limit the number of first binding point grayscales or the size of their grayscale values, as long as the grayscale value of the first binding point grayscale is between the minimum and maximum grayscale values ​​of the grayscale to be displayed. For example, if the grayscale range of the grayscale to be displayed is 8 bits, i.e., the grayscale range L0 to L255, the first binding point grayscale is at least one of the minimum grayscale value L0 and the maximum grayscale value L255.

[0058] In some specific embodiments, step S103 specifically includes:

[0059] Step S1031: Obtain initial compensation coefficients from multiple preset compensation coefficients based on the target display frequency and target display grayscale. Each preset compensation coefficient corresponds one-to-one with the preset display frequency and the first binding point grayscale.

[0060] In step S1031, the one-to-one correspondence between the preset compensation coefficient, the preset display frequency, and the grayscale of the first binding point means that multiple preset display frequencies correspond one-to-one with multiple grayscales of the first binding point, and multiple preset compensation coefficients correspond one-to-one with multiple grayscales of the first binding point, and multiple preset display frequencies correspond one-to-one with multiple preset compensation coefficients.

[0061] The preset compensation coefficient, preset display frequency, and first binding point grayscale in step S1031 can form a compensation coefficient lookup table, which is stored in a readable storage medium, such as a flash memory chip. The readable storage medium storing the target coefficient compensation lookup table can be located on the control circuit board (C-Board) of the display device. The control circuit board is connected to the driver circuit board to control the display panel. After the display panel and the control circuit board are connected, the control circuit board reads the data stored in the readable storage medium on the driver circuit board through a bidirectional two-wire synchronous serial bus (Inter-Integrated Circuit, I2C) or a serial peripheral interface (Serial Peripheral Interface, SPI), processes it, and then provides it to the display panel.

[0062] In step S104, initial compensation data is obtained based on the target display grayscale and the reference display frequency.

[0063] In step S104, the reference display frequency is one of multiple preset display frequencies. The initial compensation data corresponds one-to-one with the reference display frequency and one-to-one with the grayscale of the second binding point.

[0064] Since the actual display frequency of the display panel 201 can be, but is not limited to, 60 Hz, 120 Hz and 180 Hz, the preset display frequency is at least one of 60 Hz, 120 Hz and 180 Hz. The reference display frequency is used as the reference display frequency among the preset display frequencies. The reference display frequency is also one of 60 Hz, 120 Hz and 180 Hz. The frequency value of the second display frequency can be the same as or different from the frequency value of the first display frequency.

[0065] For example, in some embodiments provided in this application, the reference display frequency may be 60 Hz, and the preset display frequency may be at least one of 120 Hz and 180 Hz. For example, in other embodiments provided in this application, the reference display frequency may be 60 Hz, and the preset display frequency may be at least one of 180 Hz, 120 Hz, and 60 Hz.

[0066] Since the brightness value of the grayscale to be displayed when the display panel displays at a display frequency of 60 Hz is the minimum brightness value of the display panel when displaying the same grayscale to be displayed at all preset display frequencies, it is impossible to increase the brightness value of the display panel displaying the grayscale to be displayed at 60 Hz. However, the brightness value of the display panel displaying the same grayscale to be displayed at 120 Hz or 180 Hz can be reduced compared to the brightness value of the same grayscale to be displayed at 60 Hz. Therefore, the preferred reference display frequency is 60 Hz.

[0067] Specifically, initial compensation data refers to the grayscale compensation data required for the display panel to display the target grayscale when it is displaying at the reference display frequency. Grayscale compensation data, on the other hand, refers to the compensation grayscale required for the pixels in the display panel to display the target grayscale when it is displaying at the reference display frequency, obtained through the Demura (to make the display uniform) compensation algorithm in related technologies.

[0068] For example, assuming the reference display frequency is 60Hz, the initial compensation data refers to the grayscale compensation data required for the display panel to display the target grayscale when it is displaying at 60Hz. Specifically, the grayscale compensation lookup table (Demura table) for displaying at 60Hz is obtained, the target display grayscale is obtained based on the image to be displayed on the display panel, and then the initial compensation data corresponding to the target display grayscale is found in the Demura table based on the target display grayscale.

[0069] The grayscale compensation lookup table is used to characterize the relationship between the grayscale to be displayed and the grayscale compensation data of a display panel that displays at a reference display frequency. The grayscale to be displayed in the grayscale compensation lookup table includes a second preset grayscale and non-second preset grayscale. The grayscale compensation data corresponding to the second preset grayscale is obtained by actual detection and calculation. The grayscale compensation data corresponding to non-second preset grayscale is calculated by linear interpolation or non-linear interpolation of the corresponding second preset grayscale and the grayscale compensation data corresponding to the second preset grayscale.

[0070] In the compensation method 100 for the display device provided in this application, a grayscale compensation lookup table is stored in a computer-readable storage medium, such as a flash memory chip, and the computer-readable storage medium storing the grayscale compensation lookup table can be disposed on the driver circuit board (X-Board) of the display device. The driver circuit board is electrically connected to the display panel for driving the display panel.

[0071] In some embodiments provided in this application, such as Figure 2 As shown, step S104 specifically includes:

[0072] Step S1041: Calculate initial compensation data based on the target display grayscale, the second binding point grayscale, and preset compensation data. The preset compensation data corresponds one-to-one with the second binding point grayscale and the reference display frequency.

[0073] Specifically, such as Figure 2 As shown, step S1041 includes:

[0074] Step S10411: Compare the grayscale value of the target display grayscale with the grayscale value of the second binding point grayscale.

[0075] Step S10412: Based on the comparison result that the grayscale value of the target display grayscale is equal to the grayscale value of the second binding point grayscale, the preset compensation data is assigned as the initial compensation data.

[0076] Step S10413: Based on the comparison result that the gray level value of the target display gray level is not equal to the gray level value of the second binding point gray level, the initial compensation data is calculated by interpolation based on the preset compensation data corresponding to the second binding point gray level whose gray level value is less than the target display gray level, the preset compensation data corresponding to the second binding point gray level whose gray level value is greater than the target display gray level, the second binding point gray level, and the target display gray level.

[0077] In step S105, the target compensation data is calculated based on the initial compensation coefficient and the initial compensation data.

[0078] In some embodiments provided in this application, such as Figure 3 As shown, step S105 specifically includes step S1051 and step S1052.

[0079] Step S1051: Calculate the target compensation coefficient based on the target display grayscale and the initial compensation coefficient. In step S1051, the target compensation coefficient is related not only to the target display grayscale but also to the initial compensation coefficient.

[0080] Specifically, such as Figure 4 As shown, step S1051 includes:

[0081] Step S10511: Compare the grayscale value of the target display grayscale with the grayscale value of the first binding point grayscale. In step S10511, the first binding point grayscale is one or more of the grayscale values ​​to be displayed on the display panel.

[0082] Step S10512: Based on the comparison result that the grayscale value of the first binding point grayscale is equal to the grayscale value of the target display grayscale, the initial compensation coefficient is assigned as the target compensation coefficient.

[0083] When the grayscale value of the first binding point is equal to the grayscale value of the target display grayscale, the initial compensation coefficient that corresponds one-to-one between the grayscale value of the first binding point and the target display frequency is the target compensation coefficient.

[0084] Step S10513: Based on the comparison result that the gray level value of the first binding point gray level is not equal to the gray level value of the target display gray level, the target compensation coefficient is calculated by the first binding point gray level, the target display gray level and the initial compensation coefficient.

[0085] Specifically, the steps for calculating the target compensation coefficient using the first binding point grayscale, the target display grayscale, and the initial compensation coefficient include:

[0086] The target compensation coefficient is calculated based on the third preset relation, the grayscale of the first binding point, the target display grayscale, and the initial compensation coefficient. The third preset relation is:

[0087] A2 = A 10 + [(A 11 -A 10 )*(L X -L X0 )] / (L X1 -L X0 (1);

[0088] In the third preset relation (1), A2 is the target compensation coefficient, L X To display grayscale for the target, L X0 For the first binding point gray level where the gray level value is less than the target display gray level, L X1 For the first binding point gray level where the gray level value is greater than the target display gray level, A 10 A is the initial compensation coefficient corresponding to the first binding point gray level where the gray level value is less than the target display gray level. 11 The initial compensation coefficient is the gray level of the first binding point that is greater than the gray level of the target display.

[0089] In other words, in the embodiments provided in this application, as can be seen from the above-mentioned third preset relation (3), the target compensation coefficient is calculated by linear interpolation of the first binding point gray level corresponding to the target display gray level and the initial compensation coefficient corresponding to the first binding point gray level.

[0090] Of course, in other embodiments provided in this application, the target compensation coefficient can also be calculated by nonlinear interpolation using the first binding point gray level corresponding to the target display gray level and the initial compensation coefficient corresponding to the first binding point gray level.

[0091] Since the target compensation coefficient corresponding to the target display grayscale at the target display frequency is obtained by linear or nonlinear interpolation of the corresponding initial compensation coefficient, the display device does not need to store the brightness values ​​of the display panel displaying non-first-binding-point grayscales at the preset display frequency and the reference display frequency, respectively. Therefore, it does not need to store the detection and calculation of compensation coefficients corresponding to non-first-binding-point grayscales based on the display panel at the preset display frequency and the target display frequency, saving the storage space required to store compensation coefficients other than the initial compensation coefficient corresponding to the first-binding-point grayscale. In some embodiments provided in this application, to save storage space, the grayscale values ​​of the first-binding-point grayscale and the second-binding-point grayscale are equal.

[0092] Step S1052: Calculate the target compensation data based on the initial compensation data and the target compensation coefficient.

[0093] Specifically, the target compensation data is calculated based on the first preset relation, the initial compensation data, and the target compensation coefficient. The first preset relation is:

[0094] D tc =A t *D c (2);

[0095] In the first preset relation (2), D tc For the target compensation data, A t D is the target compensation coefficient. c This is the initial compensation data.

[0096] In step S106, the display panel is compensated based on the target compensation data. That is, the image data to be displayed on the display panel is compensated based on the target compensation data, so that the display panel displays the image data to be displayed based on the compensated image data.

[0097] The brightness compensation method for the display device provided in this embodiment compensates the display panel based on the target compensation data calculated from the initial compensation coefficient and the initial compensation data, so as to automatically adjust the brightness of the display panel when displaying the same target display grayscale at different display frequencies, thereby improving the brightness consistency of the display panel when displaying the same target display grayscale at different display frequencies.

[0098] In some embodiments provided in this application, such as Figure 5 As shown, before step S1031, step S103 further includes:

[0099] Step S10301: Obtain a first brightness value of the first display area of ​​the display panel displaying the first grayscale of the first bound point at a preset display frequency, and obtain a second brightness value of the second display area of ​​the display panel displaying the first grayscale of the bound point at a reference display frequency. The first and second display areas are arranged along the scan line layout direction of the display panel.

[0100] The reference display frequency can be the same as one of a plurality of preset display frequencies, or it can be different from any of the plurality of preset display frequencies. That is, the first display area is controlled to display the first preset grayscale at a preset display frequency, and the second display area is controlled to display the first preset grayscale at the reference display frequency.

[0101] Step S10302: Calculate the preset compensation coefficient based on the second preset formula, the first brightness value, and the second brightness value. The second preset formula is:

[0102] A1 = L1 / L2 (3);

[0103] In the second preset relationship (3), A1 is the preset compensation coefficient, L1 is the first brightness value, and L2 is the second brightness value.

[0104] As can be seen from the above second preset relationship (3), the first target coefficient is the ratio between the first brightness value and the second brightness value. That is, the preset compensation coefficient is the ratio between the brightness value of the first display area of ​​the display panel displaying the first preset grayscale at a preset display frequency and the brightness value of the second display area of ​​the display panel displaying the first preset grayscale at a reference display frequency.

[0105] Specifically, such as Figure 6 As shown, the display panel 201 includes a display area aa and a non-display area na surrounding the display area aa. In the display area aa, multiple scan lines SL extend along a first direction d1 and are arranged along a second direction d2, and multiple data lines DL extend along the second direction d2 and are arranged along the first direction d1. The multiple scan lines SL and the multiple data lines DL define multiple pixel regions. Each pixel region is provided with a pixel unit p, and each pixel unit p is electrically connected to a scan line SL and a data line DL.

[0106] Along the arrangement direction of scan lines SL, i.e., along the second direction d2, display area aa includes at least a first display area a1 and a second display area a2. The first display area a1 includes at least one scan line and a plurality of pixel units p electrically connected to the at least one scan line. The second display area a2 includes at least one scan line and a plurality of pixel units p electrically connected to the at least one scan line. The first brightness value is the brightness value of the first display area a1 when displaying a first preset grayscale at a preset display frequency, and the second brightness value is the brightness value of the second display area a2 when displaying the first preset grayscale at a reference display frequency.

[0107] In this embodiment, the display area aa is divided into at least a first display area a1 and a second display area a2 along the arrangement direction of the scan line SL. Therefore, the pixel units p in the first display area a1 and the second display area a2 are respectively connected to different scan lines SL. The conduction period of the transistors of the pixel units p in the first display area a1 and the second display area a2 can be controlled respectively. Thus, the first display area a1 can be independently controlled to display at a preset display frequency and the second display area a2 can be independently controlled to display at a reference display frequency. In this way, the brightness values ​​of the same display grayscale displayed at different display frequencies can be obtained based on the same frame display image of the display panel 201.

[0108] The first brightness value can be the average brightness value of all pixel units p in the first display area a1 displaying the first preset grayscale, and the second brightness value can be the average brightness value of all pixel units p in the second display area a2 displaying the first preset grayscale.

[0109] The first binding point brightness value can be the mode of multiple brightness values ​​among all pixel units p in the first display area a1 for displaying the grayscale of the first binding point, and the second binding point brightness value can be the mode of multiple brightness values ​​among all pixel units p in the second display area a2 for displaying the grayscale of the first binding point.

[0110] Of course, there are other ways to determine the first and second brightness values, and this application does not impose specific limitations. To ensure the accuracy of the obtained first and second brightness values ​​and to conform to the sample reference, the number of pixel units p in the first display area a1 is the same as the number of pixel units p in the second display area a2.

[0111] Furthermore, in some embodiments provided in this application, the first binding point grayscale includes a first number of preset sub-grayscales.

[0112] like Figure 6 As shown, the first display area a1 includes a first number of first sub-display areas a11. Each first sub-display area a11 displays a preset sub-grayscale at a preset display frequency. That is, the first number of preset sub-grayscales corresponds one-to-one with the first number of first sub-display areas a11, and any preset sub-grayscale corresponds to a first sub-display area a11 for display.

[0113] Specifically, such as Figure 7 As shown, the first binding point grayscale includes four preset sub-grayscales. For example, the four preset sub-grayscales are L25, L60, L128, and L255. The first sub-display area a11_1 is displayed based on the first preset sub-grayscale L25, the second sub-display area a11_2 is displayed based on the second preset sub-grayscale L60, the third sub-display area a11_3 is displayed based on the third preset sub-grayscale L128, and the fourth sub-display area a11_4 is displayed based on the fourth preset sub-grayscale L255.

[0114] The second display area a2 includes a first number of second sub-display areas a21. Each second sub-display area a21 displays a preset sub-grayscale at a reference display frequency. That is, the first number of preset sub-grayscales corresponds one-to-one with the first number of second sub-display areas a21, and any preset sub-grayscale corresponds to a second sub-display area a21 for display.

[0115] like Figure 7As shown, the first preset grayscale includes four preset sub-grayscales, namely L25, L60, L128 and L255. The first second sub-display area a21_1 is displayed based on the first preset sub-grayscale L25, the second second sub-display area a21_2 is displayed based on the second preset sub-grayscale L60, the third second sub-display area a21_3 is displayed based on the third preset sub-grayscale L128, and the fourth second sub-display area a21_4 is displayed based on the fourth preset sub-grayscale L255.

[0116] Based on controlling the first display area to display a first number of preset sub-grayscales at a preset display frequency and the second display area to display the first number of preset sub-grayscales at a reference display frequency, the brightness value of the display panel displaying the first number of bound-dot sub-grayscales at different display frequencies can be obtained based on a frame of the display image of the display panel.

[0117] To ensure the accuracy of the obtained preset sub-brightness value and reference sub-brightness value, the number of pixel units in any two first sub-display areas a11 is the same, the number of pixel units in any two second sub-display areas a21 is the same, and the number of pixel units in any first sub-display area a11 is the same as the number of pixel units in any second sub-display area a21.

[0118] Furthermore, in order to determine the brightness value of the first bound point grayscale displayed on the display panel at all preset display frequencies by using only one frame of the display panel image, the display area is divided into a second number of display sub-areas according to a second number of preset display frequencies along the arrangement direction of the scan lines. Each display sub-area displays the first bound point grayscale at a preset display frequency, ensuring that the second number of display sub-areas and the second number of first bound point grayscales have a one-to-one display relationship.

[0119] Taking a reference display frequency of 60 Hz as an example, and taking the first preset grayscale as L25, L60, L128, and L255 as an example, Figure 8 As shown, the target compensation coefficient is 1 for a target display frequency of 60 Hz and a target display grayscale of L25, 0.988989 for a target display frequency of 120 Hz and a target display grayscale of L25, and 0.88476 for a target display frequency of 180 Hz and a target display grayscale of L25.

[0120] The brightness compensation method for the display device provided in this embodiment establishes a compensation coefficient lookup table and provides target compensation data to the display panel based on the compensation coefficient lookup table, so as to automatically adjust the brightness of the display panel when displaying the same target display grayscale at different display frequencies, thereby improving the brightness consistency of the display panel when displaying the same target display grayscale at different display frequencies.

[0121] In a second aspect of this application, embodiments of this application also provide a display device. For example... Figure 9 As shown, the display device 200 includes a display panel 201, a target display frequency acquisition module 202, a target display grayscale acquisition module 203, a compensation storage module 204, and a compensation module 205.

[0122] The target display frequency acquisition module 202 is used to acquire the target display frequency of the display panel 201.

[0123] The target grayscale acquisition module 203 is used to acquire the target display grayscale of the display panel 201.

[0124] The compensation storage module 204 is used to store the preset display frequency, the first binding point gray level and the preset compensation coefficient corresponding to the preset display frequency and the first binding point gray level, and to store the reference display frequency, the second binding point gray level and the preset compensation data corresponding to the reference display frequency and the second binding point gray level.

[0125] The compensation coefficients stored in the compensation storage module 204 are related not only to the preset display frequency of the display panel 201, but also to the display grayscale of the display panel 201. In other words, only when the target display frequency and the target display grayscale of the display panel 201 are determined can the target compensation coefficients corresponding one-to-one with the target display frequency and the target display grayscale be determined.

[0126] Even if the target display grayscale is the same, the target compensation coefficient may differ depending on the target display frequency. Similarly, even if the target display frequency is the same, the target compensation coefficient may differ depending on the target display grayscale.

[0127] The compensation module 205 is used to obtain the initial compensation coefficient and initial compensation data from the compensation storage module 204 based on the target display grayscale, target display frequency and reference display frequency, calculate the target compensation data based on the initial compensation coefficient and initial compensation data, and compensate the image to be displayed on the display panel based on the target compensation data.

[0128] The display device 200 provided in this embodiment stores the preset display frequency and the preset compensation coefficient corresponding to the first binding point gray level of the display panel 201, as well as the preset compensation data corresponding to the reference display frequency and the second binding point gray level, through the compensation storage module 204. Then, the compensation module 205 calculates the target compensation data based on the initial compensation coefficient and the initial compensation data, and compensates the display panel based on the target compensation data. Since the target compensation coefficients corresponding to the same target display gray level are not the same for different target display frequencies of the display panel 201, the target compensation data corresponding to the same target display gray level of the display panel 201 are not the same for different target display frequencies. Thus, the display panel 201 can display based on different target compensation data at different target display frequencies to achieve the same display brightness, so that the brightness of the display panel 201 is close to consistent when displaying the same display gray level at different display frequencies.

[0129] In this embodiment, the compensation storage module 204 stores grayscale compensation data that corresponds one-to-one with the second binding point grayscale and the reference display frequency, based on Demura (brightness uniformity) adjustment technology to compensate each pixel unit in the display panel 201. When the reference display frequency is determined, the display panel 201 displays based on the corresponding grayscale compensation data to ensure the uniformity of the screen brightness when the display panel 201 displays at the reference display frequency.

[0130] The grayscale compensation data corresponding to the second binding point grayscale stored in the compensation storage module 204 is obtained by actual detection calculation. The grayscale compensation data corresponding to grayscale other than the second binding point grayscale is calculated by linear interpolation or nonlinear interpolation of the corresponding second binding point grayscale and the grayscale compensation data corresponding to the second binding point grayscale.

[0131] Since the grayscale compensation data corresponding to the non-second preset grayscale is obtained by linear interpolation or non-linear interpolation of the corresponding second preset grayscale and the grayscale compensation data corresponding to the second preset grayscale, the display device 200 does not need to detect and store the grayscale compensation data of the detected display panel 201 corresponding to the non-second binding point grayscale, thereby saving the storage space of the display device 200.

[0132] In some embodiments provided in this application, the grayscale value of the first binding point grayscale stored in the storage module 204 is equal to the grayscale value of the second binding point grayscale stored in the storage module 204. That is, the first binding point grayscale and the second binding point grayscale are the same. For example, if the grayscale range to be displayed in the display panel 201 is L0 to L255, the first binding point grayscale in the grayscale to be displayed stored in the compensation storage module 204 is L25, L60, L128 and L255, and the second binding point grayscale in the grayscale to be displayed stored in the compensation storage module 204 is also L25, L60, L128 and L255.

[0133] In the display device 200 provided in this embodiment, since the first binding point grayscale and the second binding point grayscale stored in the compensation storage module 204 are the same, the first binding point grayscale stored in the compensation storage module 204 can be determined based on the second binding point grayscale stored in the compensation storage module 204, thereby saving the storage space required for the compensation storage module 204 to store the first binding point grayscale.

[0134] In some embodiments provided in this application, the compensation module 205 is further configured to calculate the target compensation coefficient based on the target display grayscale and the initial compensation coefficient, and to calculate the target compensation coefficient based on the initial compensation data and the target compensation coefficient.

[0135] Specifically, the compensation module 205 is used to calculate the target compensation data based on the first preset relation, the initial compensation data, and the target compensation coefficient.

[0136] The first presupposed relation is:

[0137] D tc =A t *D c (2);

[0138] In the first presupposed relation (2) above, D tc For the target compensation data, A t D is the target compensation coefficient. c This is the initial compensation data.

[0139] As can be seen from the first preset relationship (2) above, the target compensation data provided to the display panel 201 is the product of the target compensation coefficient and the initial compensation data. Therefore, under different target display frequencies, the target coefficients corresponding to the same target display grayscale are not the same. Based on the different target coefficients, even if the grayscale compensation data corresponding to the same target display grayscale is the same under different target display frequencies of the display panel 201, the target compensation data corresponding to the same target display grayscale is not the same. Thus, the display panel 201 can display under different target display frequencies based on different target compensation data to achieve a display brightness that tends to be the same or completely the same under different display frequencies.

[0140] Of course, this application may have other various embodiments. Without departing from the spirit and essential points of this application, those skilled in the art can make various corresponding changes and modifications based on this application, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A brightness compensation method of a display device, characterized by, The method comprises the following steps: obtaining a target display frequency of a display panel of the display device; obtaining a target display gray scale of the display panel; obtaining an initial compensation coefficient according to the target display frequency and the target display gray scale, wherein the initial compensation coefficient corresponds to the target display frequency and a first binding point gray scale in a one-to-one manner; obtaining initial compensation data according to the target display gray scale and a reference display frequency; calculating target compensation data according to the initial compensation coefficient and the initial compensation data; compensating the display panel based on the target compensation data. The step of obtaining the initial compensation coefficient according to the target display frequency and the target display gray scale comprises the following steps: obtaining the initial compensation coefficient from a plurality of preset compensation coefficients according to the target display frequency and the target display gray scale, wherein the preset compensation coefficients correspond to preset display frequencies and the first binding point gray scale in a one-to-one manner. Before the step of obtaining the initial compensation coefficient from a plurality of preset compensation coefficients according to the target display frequency and the target display gray scale, the method further comprises the following steps: obtaining a first luminance value of the first binding point gray scale displayed by a first display area of the display panel at the preset display frequency, and obtaining a second luminance value of the first binding point gray scale displayed by a second display area of the display panel at the reference display frequency, wherein the first display area and the second display area are arranged along a scanning line arrangement direction of the display panel; calculating the preset compensation coefficient according to a second preset relationship, the first luminance value and the second luminance value, wherein the second preset relationship is A1=L1 / L2, wherein A1 is the preset compensation coefficient, L1 is the first luminance value, and L2 is the second luminance value.

2. The brightness compensation method of a display device according to claim 1, wherein The step of calculating the target compensation data according to the initial compensation coefficient and the initial compensation data comprises the following steps: calculating a target compensation coefficient according to the target display gray scale and the initial compensation coefficient; calculating the target compensation data according to the initial compensation data and the target compensation coefficient.

3. The brightness compensation method of a display device according to claim 2, wherein The step of calculating the target compensation coefficient according to the target display gray scale and the initial compensation coefficient comprises the following steps: comparing the gray scale value of the target display gray scale with the gray scale value of the first binding point gray scale; according to the comparison result that the gray scale value of the first binding point gray scale is equal to the gray scale value of the target display gray scale, assigning the initial compensation coefficient as the target compensation coefficient.

4. The brightness compensation method of a display device according to claim 3, wherein The step of calculating the target compensation coefficient according to the target display gray scale and the initial compensation coefficient further comprises the following steps: according to the comparison result that the gray scale value of the first binding point gray scale is not equal to the gray scale value of the target display gray scale, calculating the target compensation coefficient through the first binding point gray scale, the target display gray scale and the initial compensation coefficient.

5. The brightness compensation method of a display device according to claim 2, wherein The step of calculating the target compensation data according to the initial compensation data and the target compensation coefficient comprises the following steps: The target compensation data is calculated according to a first preset relationship, the initial compensation data and the target compensation coefficient, the first preset relationship is: D tc =A t *D c ; wherein D tc is the target compensation data, A t is the target compensation coefficient, D c is the initial compensation data.

6. The brightness compensation method of a display device according to claim 1, wherein The step of obtaining the initial compensation data according to the target display gray scale and a reference display frequency comprises the following steps: The initial compensation data is calculated according to the target display gray scale, the second binding point gray scale and preset compensation data, wherein the preset compensation data corresponds to the second binding point gray scale and the reference display frequency one by one.

7. A display device, characterized by comprising: The display panel comprises: a target display frequency acquisition module, configured to acquire a target display frequency of the display panel; a target display gray scale acquisition module, configured to acquire a target display gray scale of the display panel; a compensation storage module, configured to store a preset display frequency, a first binding point gray scale, preset compensation coefficients corresponding to the preset display frequency and the first binding point gray scale one by one, and a reference display frequency, a second binding point gray scale and preset compensation data corresponding to the reference display frequency and the second binding point gray scale one by one; a compensation module, configured to acquire initial compensation coefficients and initial compensation data from the compensation storage module based on the target display gray scale, the target display frequency and the reference display frequency, calculate target compensation data according to the initial compensation coefficients and the initial compensation data, and compensate the display panel based on the target compensation data; the compensation module is further configured to acquire a first luminance value of the first binding point gray scale displayed by a first display area of the display panel at the preset display frequency, and acquire a second luminance value of the first binding point gray scale displayed by a second display area of the display panel at the reference display frequency, wherein the first display area and the second display area are arranged along a scanning line arrangement direction of the display panel; the compensation module is further configured to calculate the preset compensation coefficients according to a second preset relationship and the first luminance value and the second luminance value, wherein the second preset relationship is A1=L1 / L2, wherein A1 is the preset compensation coefficient, L1 is the first luminance value and L2 is the second luminance value; the compensation module is further configured to acquire initial compensation coefficients from a plurality of preset compensation coefficients according to the target display frequency and the target display gray scale, wherein the preset compensation coefficients correspond to the preset display frequency and the first binding point gray scale one by one. The compensation storage module stores the same gray scale value of the first binding point gray scale and the second binding point gray scale.

8. The display device according to claim 7, wherein ​

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