Display unevenness compensation method of display panel, display panel and display device

Abstract

The invention discloses a display unevenness compensation method of a display panel, the display panel and a display device. The display unevenness compensation method comprises the steps of obtaining a display unevenness compensation value of a to-be-displayed picture of a display panel; according to the display non-uniform compensation value, gray scale characteristic parameters are determined; searching a comparison table of the gray scale characteristic parameters and gain parameters according to the gray scale characteristic parameters, and determining gain parameter values corresponding to the gray scale characteristic parameters; according to the display non-uniformity compensation value and the gain parameter value, performing display non-uniformity compensation on a display picture of the display panel; wherein the gray scale characteristic parameter and gain parameter comparison table is pre-stored in the display panel. According to the invention, the gray scale characteristic parameters are calculated by designing a display unevenness compensation value calculation method, the gray scale characteristic parameters are used for measuring the Mura degrees of different display panels in the same batch, and the display panels are compensated by using the corresponding gain parameters according to the different Mura degrees, so that the Demura compensation precision is improved, and the display quality of the display panels is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to display technology, and more particularly to a display unevenness compensation method of a display panel, a display panel and a display device. Background Art

[0002] Due to the influence of materials and processes during the manufacturing process of the display panel, there will be differences in the light-emitting elements, and the display panel will have a display unevenness (Mura) phenomenon. In order to improve the display effect, it is usually necessary to use display unevenness compensation (Demura) technology to compensate for the brightness differences between pixels.

[0003] The current demura compensation scheme currently uses a joint compensation method of display unevenness compensation value and compensation gain parameter. The product of the two is the grayscale brightness adjustment value of the mura area. By lowering the grayscale brightness of the bright mura area and increasing the grayscale brightness of the dark mura area, the overall brightness of the display is made consistent. However, heavier mura requires raising or lowering more grayscale, and the display unevenness compensation data of each display panel is certain, so compensating for heavier mura requires increasing the compensation gain parameter. However, the larger the compensation gain parameter, the more over-compensation will occur for lighter mura.

[0004] Therefore, it is necessary to improve the existing Demura technology to enhance the display unevenness compensation effect of the display panel. Summary of the invention

[0005] The embodiments of the present invention provide a display unevenness compensation method, a display panel, and a display device of a display panel. A display unevenness compensation value calculation method is designed to calculate grayscale characteristic parameters, and the grayscale characteristic parameters are used to measure the Mura degree of different display panels in the same batch. The display panel is compensated for different Mura degrees using corresponding gain parameters, thereby improving the Demura compensation accuracy and enhancing the display quality of the display panel.

[0006] In a first aspect, an embodiment of the present invention provides a method for compensating uneven display of a display panel, comprising:

[0007] Obtaining a display unevenness compensation value of a picture to be displayed on the display panel;

[0008] Determining grayscale characteristic parameters according to the display unevenness compensation value;

[0009] According to the grayscale characteristic parameter, searching a grayscale characteristic parameter and gain parameter comparison table to determine a gain parameter value corresponding to the grayscale characteristic parameter;

[0010] Performing display unevenness compensation on a display picture of the display panel according to the display unevenness compensation value and the gain parameter value;

[0011] Wherein, the grayscale characteristic parameter and gain parameter comparison table is pre-stored in the display panel.

[0012] In a second aspect, an embodiment of the present invention further provides a display panel, which uses the display unevenness compensation method described in the first aspect to improve display uniformity during display.

[0013] In a third aspect, an embodiment of the present invention further provides a display device, comprising the display panel described in the second aspect.

[0014] The display unevenness compensation method of the display panel provided by the embodiment of the present invention first obtains the display unevenness compensation value of the display panel to be displayed; then determines the grayscale characteristic parameter according to the display unevenness compensation value; then searches the grayscale characteristic parameter and gain parameter comparison table according to the grayscale characteristic parameter to determine the gain parameter value corresponding to the grayscale characteristic parameter; performs display unevenness compensation on the display screen of the display panel according to the display unevenness compensation value and the gain parameter value; wherein the grayscale characteristic parameter and gain parameter comparison table is pre-stored in the display panel. The technical solution of the embodiment of the present invention calculates the grayscale characteristic parameter by designing a display unevenness compensation value calculation method, uses the grayscale characteristic parameter as a measure of the Mura degree of different display panels in the same batch, and uses the corresponding gain parameter to compensate the display panel for different Mura degrees, thereby improving the Demura compensation accuracy and improving the display quality of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a comparison diagram of a display panel with normal Mura before and after compensation;

[0016] Figure 2 This is a comparison diagram of a display panel with severe Mura before and after compensation;

[0017] Figure 3 This is a comparison diagram of a display panel with lighter Mura before and after compensation;

[0018] Figure 4 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0019] Figure 5 A schematic diagram of a flow chart of a method for compensating uneven display of a display panel provided by an embodiment of the present invention;

[0020] Figure 6 A schematic diagram of a flow chart for obtaining a display unevenness compensation value provided by an embodiment of the present invention;

[0021] Figure 7 A flow chart of a method for determining a display unevenness compensation value provided by an embodiment of the present invention;

[0022] Figure 8 A schematic diagram of a flow chart of a method for determining grayscale characteristic parameters provided by an embodiment of the present invention;

[0023] Fig. 9 A schematic flow chart of another method for compensating uneven display of a display panel provided by an embodiment of the present invention;

[0024] Fig.10 A schematic diagram of a process for calibrating a grayscale characteristic parameter and a gain parameter comparison table provided in an embodiment of the present invention;

[0025] Fig.11 A schematic flow chart of another method for compensating uneven display of a display panel provided by an embodiment of the present invention;

[0026] Fig.12 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0027] Fig.13 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0028] Fig.14 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0029] Fig.15 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0030] Fig.16 A schematic diagram of the structure of another display panel provided by the present invention;

[0031] Fig.17 for Fig.16 A partial enlarged schematic diagram of the display panel in the middle M area;

[0032] Fig.18 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be directly formed "on" or "under" another element, but also indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second" and the like are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] Existing Demura technology usually includes the following steps: first, the display panel is set on the Demura station machine, the display panel is controlled to display a preset test screen, and an industrial camera is used to take a picture of the display panel to obtain the brightness data of different positions of the display panel; then the Demura algorithm is called to calculate the compensation data; the compensation data is processed into a bin or hex burning file, and burned into the external flash chip (Flash IC) of the main flexible circuit board (FPC) of the display panel module; when Demura is working, the compensation data will be loaded into the memory of the display driver chip (DDIC), combined with the display unevenness gain coefficient (Gain) value, and the product of the two is used as the grayscale brightness adjustment value of the Mura area, and the grayscale brightness of the bright Mura area is lowered and the grayscale brightness of the dark Mura area is increased, so that the overall brightness of the display panel is consistent.

[0036] In the current compensation scheme, all display panels of the same batch are compensated with the same compensation parameters. The same compensation parameters can only compensate for ordinary mura display panels well; for display panels with severe mura and display panels with less mura, the compensation effect is poor. For display panels with severe mura, under-compensation will occur; for display panels with less mura, over-compensation will occur. For example, Figure 1 This is a schematic diagram comparing the display panel with ordinary Mura before and after compensation. The left picture is before compensation, and the right picture is after compensation. For the display panel with ordinary Mura, the display uniformity is significantly improved after compensation than before compensation. Figure 2 This is a schematic diagram comparing a display panel with severe Mura before and after compensation. The left picture is before compensation, and the right picture is after compensation. For a display panel with severe Mura, uneven display still exists after compensation due to insufficient compensation. Figure 3This is a schematic diagram comparing the display panel with lighter Mura before and after compensation. The left picture is before compensation, and the right picture is after compensation. For the display panel with lighter Mura, due to the over-compensation phenomenon, more serious display unevenness will occur after compensation.

[0037] In order to solve the above problems, an embodiment of the present invention provides a display unevenness compensation method for a display panel, which first obtains a display unevenness compensation value of a picture to be displayed on the display panel; then, according to the display unevenness compensation value, a grayscale characteristic parameter is determined; then, according to the grayscale characteristic parameter, a grayscale characteristic parameter and gain parameter comparison table is searched to determine the gain parameter value corresponding to the grayscale characteristic parameter; according to the display unevenness compensation value and the gain parameter value, the display picture of the display panel is compensated for the display unevenness; wherein, the grayscale characteristic parameter and gain parameter comparison table is pre-stored in the display panel.

[0038] By adopting the above technical solution, the grayscale characteristic parameters are calculated by designing a display unevenness compensation value calculation method. The grayscale characteristic parameters are used to measure the Mura degree of different display panels in the same batch. The display panels are compensated for different Mura degrees using corresponding gain parameters, thereby improving the Demura compensation accuracy and the display quality of the display panels.

[0039] The above is the core idea of ​​the present invention. The technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Figure 4 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention. Figure 4 As shown, an embodiment of the present invention provides a display panel. When displaying, the display panel adopts any one of the display unevenness compensation methods of the display panel provided by the embodiments of the present invention to improve display uniformity.

[0041] Specifically, refer to Figure 4As shown, the display panel 10 may include an organic light emitting diode (OLED) display panel, an active-matrix organic light emitting diode (AMOLED) display panel, a quantum dot light emitting diode (QLED) display panel, a light emitting diode (LED) display panel, a micro light emitting diode (Micro LED) display panel, a submillimeter light emitting diode (Mini LED) display panel, etc. The embodiment of the present invention does not impose any specific restrictions on the type of the display panel 10.

[0042] The display panel 10 includes a display area AA and a non-display area NA, wherein a plurality of sub-pixels 20 are arranged in the display area AA, the display area AA is used to display images, and the non-display area NA is provided with a source driving circuit, a gate driving circuit and other structures. For example, Figure 4 Only three sub-pixels 20 are shown in the figure, and more sub-pixels 20 are not shown one by one here.

[0043] It should be noted that the display panel 10 provided in the embodiment of the present invention also includes other film layer regions below the display area AA, such as a substrate and a sub-pixel driving circuit layer ( Figure 4 The sub-pixel driving circuit may be a 2T1C (two transistors and one capacitor), 4T1C, 7T1C, 7T2C, 8T1C, 8T2C, or other circuit structure. The sub-pixel driving circuit includes a plurality of thin film transistors (TFT), storage capacitors, metal wiring, and other film layer structures, which are used to provide a driving current to the sub-pixel 20 to drive the sub-pixel 20 to emit light. The film layer structures of the sub-pixel driving circuit are not shown one by one in the embodiment of the present invention.

[0044] Figure 5 A flow chart of a method for compensating uneven display of a display panel provided by an embodiment of the present invention, referring to Figure 5 As shown, the display unevenness compensation method of the display panel provided by the embodiment of the present invention includes:

[0045] S110 , obtaining a display unevenness compensation value of a picture to be displayed on a display panel.

[0046] Among them, for the display panels of the same batch, the display unevenness compensation values ​​of each display screen of the display panel can be tested experimentally. For each display screen, there are multiple display unevenness compensation values. For example, in a certain embodiment, a sub-pixel can be set to correspond to a display unevenness compensation value; in another embodiment, a pixel area can be set to correspond to a display unevenness compensation value (this compensation value can be understood as the average value of the area). It can be understood that the more the number of display unevenness compensation values, the better the compensation effect, but it may take up more storage space. The specific implementation can be designed according to actual conditions. The display unevenness compensation value is then written into the storage unit of the display panel in a specific format (such as hexadecimal data). Optionally, the display panel includes a storage unit, Figure 6 A schematic diagram of a flow chart of obtaining a display unevenness compensation value provided by an embodiment of the present invention, referring to Figure 6 As shown, obtaining a display unevenness compensation value of a picture to be displayed on a display panel includes:

[0047] S111 . Acquire display unevenness compensation data stored in a storage unit.

[0048] The storage unit of the display panel may be Flash, which may store the display unevenness compensation data in a preset storage method, such as binary or hexadecimal, etc. Different data may store different display unevenness compensation values.

[0049] S112: Decompress the display unevenness compensation data to obtain a display unevenness compensation value.

[0050] Since the display unevenness compensation data stored in the storage unit is not necessarily the actual display unevenness compensation value, the display unevenness compensation data needs to be decompressed and transmitted to the driver chip of the display panel, and the driver chip is used to further process the display unevenness compensation value.

[0051] Optionally, the display unevenness compensation value is the difference between the actual display brightness and the expected display brightness. Figure 7 A flow chart of a method for determining a display unevenness compensation value provided by an embodiment of the present invention, referring to Figure 7 As shown, the method for determining the display unevenness compensation value includes:

[0052] S1101, controlling the display panel to display a test screen.

[0053] When the display panel is controlled to display the test screen, the sub-pixel driving circuit of the display panel provides a driving current to the light-emitting element of the sub-pixel in the display area AA, and the sub-pixel in the display area AA lights up the light-emitting element to display the test screen. Optionally, controlling the display panel to display the test screen includes at least one of the following:

[0054] In a feasible embodiment, the display panel is controlled to display monochrome test pictures at different refresh frequencies.

[0055] For example, a monochrome test picture of the display panel is controlled at a refresh rate of 120 Hz or 60 Hz.

[0056] Among them, the monochrome test picture refers to that when the display panel displays, only sub-pixels of the same luminous color are lit at the same time, such as a red display picture, a green display picture, a blue display picture, etc.

[0057] In another feasible implementation manner, the display panel is controlled to display monochrome test images at different maximum brightnesses.

[0058] Exemplarily, a monochrome test picture of a sub-pixel of a display panel under different maximum brightness (DBV) is controlled, for example, a monochrome display picture under conditions of maximum brightness of 30%, 50%, 80%, etc.

[0059] In another feasible implementation manner, the display panel is controlled to display monochrome test images at different grayscales.

[0060] For example, the sub-pixels of the display panel are controlled to display monochrome test images at different grayscales, such as 16, 32, 128 grayscales, etc.

[0061] S1102: Use a camera to shoot a test picture to obtain shooting data of the test picture.

[0062] Exemplarily, the captured data may be the grayscale value of each sub-pixel in the display area AA. For example, taking the case where 2048×2048 sub-pixels are set in the display area AA and the grayscale value range of each sub-pixel is 0 to 255, a device such as a CCD (Charge Coupled Device, CCD) camera or a CMOS (Complementary Metal Oxide Semiconductor, CMOS) camera is used to capture the display test screen of the display panel, and the data is output and recorded as the grayscale value of each sub-pixel in the display area AA.

[0063] In other embodiments, the maximum brightness value of each sub-pixel in the display area AA may be output and recorded as data, wherein the larger the grayscale value of the sub-pixel is, the higher its brightness is.

[0064] S1103. Calculate the difference between the actual display brightness and the expected display brightness according to the shooting data.

[0065] The actual display brightness is obtained through testing, the expected display brightness is a preset known quantity, and the difference between the actual display brightness and the expected display brightness is calculated to obtain the display unevenness compensation value.

[0066] S120 , determining grayscale characteristic parameters according to the display unevenness compensation value.

[0067] In this embodiment, a grayscale characteristic parameter calculation method can be set in the driver chip to calculate the grayscale characteristic parameter, and the parameter is used to measure the Mura degree of different display panels in the same batch. The display panel is compensated for different Mura degrees using corresponding gain parameters, thereby improving the Demura compensation accuracy and the display quality of the display panel.

[0068] Figure 8 A flowchart of a method for determining grayscale characteristic parameters provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, optionally, determining the grayscale characteristic parameter according to the display unevenness compensation value includes:

[0069] S121, obtain the maximum value offset in the display unevenness compensation value max and minimum offset min .

[0070] In specific implementation, a set of intermediate values ​​of compensation parameters can be preset in the driver chip as the initial maximum value and minimum value. Each set of compensation parameters is compared with the maximum value to obtain the maximum value in the offset compensation parameter. The maximum value is subtracted from the minimum value to obtain the grayscale characteristic parameter of the difference. Optionally, the larger the value of the grayscale characteristic parameter, the larger the value of the gain parameter. That is, the higher the characteristic parameter, the more serious the Mura degree; the lower the characteristic parameter, the lighter the Mura degree.

[0071] S122, determine the grayscale characteristic parameter as offset max -offset min .

[0072] A grayscale characteristic parameter calculation program can be preset in the driver chip to extract the maximum and minimum values ​​of the offset, and then subtract them to obtain the grayscale characteristic parameters.

[0073] S130 , searching a grayscale characteristic parameter and gain parameter comparison table according to the grayscale characteristic parameter, and determining a gain parameter value corresponding to the grayscale characteristic parameter.

[0074] Among them, the higher the characteristic parameter, the more serious the Mura degree; the lower the characteristic parameter, the lighter the Mura degree. For example, Table 1 is a grayscale characteristic parameter and gain parameter comparison table provided in an embodiment of the present invention. Optionally, the value of the grayscale characteristic parameter is less than or equal to 32, and the value of the gain parameter is less than or equal to 1.6.

[0075] Table 1 Grayscale characteristic parameters and gain parameters comparison table

[0076] Grayscale characteristic parameters Gain parameter value 32 1.6 30 1.5 28 1.4 …… …… 2 0.1 0 0

[0077] In other embodiments, a grayscale characteristic parameter and gain parameter comparison table may be designed according to actual conditions, and the embodiment of the present invention is not limited to this.

[0078] S140 , performing display unevenness compensation on a display image of a display panel according to the display unevenness compensation value and the gain parameter value.

[0079] The grayscale characteristic parameter and gain parameter comparison table is pre-stored in the display panel.

[0080] After determining the corresponding gain parameter value according to the grayscale characteristic parameter and gain parameter comparison table, the display unevenness compensation value and the corresponding gain parameter value are used to perform display unevenness compensation. Compared with the prior art using the same gain parameter value, the accuracy of display unevenness compensation can be significantly improved and the display effect can be enhanced.

[0081] Optionally, performing display unevenness compensation on a display screen of a display panel according to the display unevenness compensation value and the gain parameter value includes:

[0082] According to gray on =gray off +Gain×offset is used to compensate for display unevenness.

[0083] Among them gray on Indicates the brightness after compensation, gray off Indicates the brightness before compensation, Gain indicates the gain parameter value, and offset indicates the display unevenness compensation value.

[0084] Specifically, a CCD camera or a CMOS camera or other device can be used to capture the display test screen of the display panel, and the data is output and the brightness value of each sub-pixel in the display area AA is recorded, that is, the brightness gray value of the display test screen before compensation. off ; Then obtain the display unevenness compensation value offset and the corresponding gain parameter value Gain, according to the formula gray on =gray off +Gain×offset is used to compensate for display unevenness.

[0085] Fig. 9 A flow chart of another method for compensating uneven display of a display panel provided by an embodiment of the present invention, referring to Fig. 9 As shown, the display unevenness compensation method includes:

[0086] S210 , performing a gain parameter determination experiment using a plurality of display panels, and calibrating a grayscale characteristic parameter and gain parameter comparison table.

[0087] It is understandable that before compensating for the display unevenness of the display panel, it is necessary to first determine a comparison table of grayscale characteristic parameters and gain parameters, and pre-store the comparison table in the display panel.

[0088] Optionally, the grayscale characteristic parameter and gain parameter comparison table includes grayscale characteristic parameter values ​​of multiple gradient distributions and corresponding gain parameters. Fig.10 A schematic diagram of a flow chart for calibrating a grayscale characteristic parameter and a gain parameter comparison table provided in an embodiment of the present invention, referring to Fig.10 As shown, a gain parameter determination experiment is performed using multiple display panels to calibrate a grayscale characteristic parameter and a gain parameter comparison table, including:

[0089] S211 . Perform display unevenness compensation tests on multiple display panels under a gradient of a certain grayscale characteristic parameter, and record multiple sets of gain compensation values.

[0090] S212, averaging the multiple groups of gain compensation values ​​to determine the gain parameter value under the grayscale characteristic parameter gradient.

[0091] Exemplarily, a gain parameter value determination experiment can be performed using 5 display panels at each grayscale characteristic parameter gradient. At each gradient, the grayscale characteristic value is determined according to the grayscale characteristic parameter calculation method, and the 5 display panels are respectively adjusted to the optimal display effect, and the 5 groups of gain compensation values ​​are recorded, and the average value is obtained as the optimal gain parameter value under the grayscale characteristic parameter gradient.

[0092] S213, performing the same experiment under all grayscale characteristic parameter gradients, recording the average value of each gain compensation value as the corresponding gain parameter value, and obtaining a grayscale characteristic parameter and gain parameter comparison table.

[0093] Repeat the same experiment under the grayscale characteristic parameter gradient, record the average optimal compensation gain value of every 5 display panels, and finally obtain a grayscale characteristic parameter and gain parameter value comparison table. Exemplarily, in a certain embodiment, display panels with different grayscale characteristic parameters are burned with corresponding gain parameters, and visual effect judgment is performed. If the compensated display panel has no abnormal over-compensation or under-compensation, a grayscale characteristic parameter and gain parameter value comparison table with better effect is obtained.

[0094] S220 , obtaining a display unevenness compensation value of a picture to be displayed on the display panel.

[0095] S230 , determining grayscale characteristic parameters according to the display unevenness compensation value.

[0096] S240 . According to the grayscale characteristic parameter, search for a grayscale characteristic parameter and gain parameter comparison table to determine a gain parameter value corresponding to the grayscale characteristic parameter.

[0097] S250 , performing display unevenness compensation on a display image of a display panel according to the display unevenness compensation value and the gain parameter value.

[0098] The technical solution of the embodiment of the present invention calculates grayscale characteristic parameters by designing a display unevenness compensation value calculation method, uses the grayscale characteristic parameters as a measure of the Mura degree of different display panels in the same batch, and uses corresponding gain parameters to compensate the display panel for different Mura degrees, thereby improving the Demura compensation accuracy and enhancing the display quality of the display panel.

[0099] Fig.11 A flow chart of another method for compensating uneven display of a display panel provided by an embodiment of the present invention, referring to Fig.11 As shown, the display unevenness compensation method includes:

[0100] S310: Obtain a display unevenness compensation value of a picture to be displayed on a display panel.

[0101] S320: Determine grayscale characteristic parameters according to the display unevenness compensation value.

[0102] S330 , searching a grayscale characteristic parameter and gain parameter comparison table according to the grayscale characteristic parameter, and determining a gain parameter value corresponding to the grayscale characteristic parameter.

[0103] S340 , performing display unevenness compensation on the display screen of the display panel according to the display unevenness compensation value and the gain parameter value.

[0104] S350, testing the compensated display screen, if uneven display still exists, adjusting the gain parameter value to compensate for uneven display again until the compensation requirement is met.

[0105] If the display screen after compensation is over-compensated after testing, the gain parameter value is reduced; if the display screen after compensation is under-compensated after testing, the gain parameter value is increased. The gain parameter value can be adjusted multiple times until the compensation requirement is met. In addition, if multiple display panels are tested to have uneven display after compensation, there may be an inaccurate grayscale characteristic parameter and gain parameter comparison table, and the grayscale characteristic parameter and gain parameter comparison table can be recalibrated through experiments.

[0106] The technical solution of this embodiment can verify the display unevenness compensation effect by testing the compensated display picture. If the compensation effect cannot meet the requirements, compensation can be performed again to improve the display effect.

[0107] In some embodiments, different display areas of the display panel may have different Mura levels. Optionally, the display area of ​​the display panel is divided into at least two sub-display areas, and the at least two sub-display areas correspond to different grayscale characteristic parameter and gain parameter comparison tables.

[0108] Fig.12 A schematic diagram of another display panel provided by an embodiment of the present invention, referring to Fig.12 As shown, the display area AA is pre-divided into at least two sub-display areas, for example, Fig.12 In the embodiment, the display area AA can be divided into 9 sub-display areas according to the long side (Y direction) and the short side (X direction), such as the first sub-display area V1, the second sub-display area V2, the third sub-display area V3, the fourth sub-display area V4, the fifth sub-display area V5, the sixth sub-display area V6, the seventh sub-display area V7, the eighth sub-display area V8, and the ninth sub-display area V9.

[0109] Among them, the number of sub-pixels in each sub-display area can be the same or different; the number of sub-pixels in each sub-display area can be one or more. When the number of sub-pixels in the sub-display area is one, the embodiment of the present invention can also compensate for the display brightness of a single sub-pixel to achieve precise compensation of display brightness at the sub-pixel level.

[0110] Based on the above embodiments, continue to refer to Fig.12 As shown, optionally, the method for dividing the display area includes:

[0111] The display area is divided into a plurality of sub-display areas arranged in an array, and the sub-display areas have the same area.

[0112] Specifically, refer to Fig.12 As shown, in some embodiments, the display area AA can be divided into a plurality of sub-display areas arranged in an array, and the sub-display areas have the same area. For example, the display area AA is divided into 9 sub-display areas of the same area, V1 to V9. The number of sub-pixels 1 in the 9 sub-display areas can be the same or different.

[0113] Fig.13 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention. Based on the above embodiment, optionally, the method for dividing the display area further includes:

[0114] The display area is divided into a plurality of sub-display areas arranged in an array, and at least two of the sub-display areas have different areas.

[0115] Specifically, refer to Fig.13 As shown, in some embodiments, the display area AA can be divided into a plurality of sub-display areas arranged in an array, and each sub-display area has a different area. For example, the display area AA is divided into 9 sub-display areas with different areas, V1 to V9. The number of sub-pixels in the 9 sub-display areas can be the same or different.

[0116] Fig.14FIG. 1 is a schematic diagram of a structure of another display panel provided by an embodiment of the present invention. Fig.14 As shown, the display area AA of the display panel 10 is rectangular. Optionally, the method for dividing the display area further includes:

[0117] The display area is divided into at least two sub-display areas arranged along the diagonal direction of the rectangle, and at least one sub-display area includes a first sub-display area extending along a first direction and a second sub-display area along a second direction.

[0118] The first direction (such as Fig.14 X direction) and the second direction (such as Fig.14 The Y direction) is parallel to the side length of the rectangle.

[0119] Specifically, refer to Fig.14 As shown, the display area AA is divided into 5 sub-display areas, namely the first sub-display area V1, the second sub-display area V2, the third sub-display area V3, the fourth sub-display area V4, and the fifth sub-display area V5. Taking the third sub-display area V3 as an example, the third sub-display area V3 is composed of the first sub-display area V31 extending along the X direction in the figure and the second sub-display area V32 extending along the Y direction in the figure, that is, V3 = V31 + V32. Among them, the coordinate parameters of the sub-display areas V1 to V5 are shown in Table 2.

[0120] Table 2 shows the coordinate parameters of the sub-display areas V1 to V5.

[0121] V1_XS V1_XE V1_YS V1_YE V2_XS V2_XE V2_YS V2_YE V3_XS V3_XE V3_YS V3_YE V4_XS V4_XE V4_YS V4_YE

[0122] Among them, V3_XS refers to the coordinates of the starting sub-pixel of the third sub-display area V3 along the X direction in the figure, V3_XE refers to the coordinates of the ending sub-pixel of the third sub-display area V3 along the X direction in the figure: V3_YS refers to the coordinates of the starting sub-pixel of the third sub-display area V3 along the Y direction in the figure, and V3_YE refers to the coordinates of the ending sub-pixel of the third sub-display area V3 along the Y direction in the figure. By analogy, the embodiment of the present invention can freely define the block size and position according to the display uniformity, and the corresponding grayscale characteristic parameter and gain parameter comparison table can be set separately for the custom block.

[0123] Fig.15 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention. On the basis of the above embodiment, the display area AA of the display panel 10 is a rectangle. Optionally, the method for dividing the display area further includes:

[0124] A plurality of sub-display areas are divided from the center of the display area to the edge in sequence, and a corresponding grayscale characteristic parameter and gain parameter comparison table is independently set for each sub-display area.

[0125] Specifically, refer to Fig.15 As shown, the display area AA is divided into four nested sub-display areas, V1 to V4, and a corresponding grayscale characteristic parameter and gain parameter comparison table is set in each sub-display area. According to the display unevenness compensation method provided in the above embodiment, the display of the display area AA can be uniformly compensated to ensure the display uniformity of the display panel.

[0126] Fig.16 A schematic diagram of the structure of another display panel provided by the present invention, Fig.17 for Fig.16 FIG. 1 is a partial enlarged schematic diagram of a display panel in the middle M region. Fig.16 and Fig.17 As shown, the display area AA of the display panel 10 includes a first area A1 and a second area A2, and the first area A1 includes a plurality of fan-out lines F1. The fan-out lines F1 are respectively connected to the driver chip IC and the sub-pixel 20, and are used to transmit one or more of the voltage signal, data signal, scanning signal, etc. provided by the driver chip IC, and the embodiment of the present invention does not make specific restrictions. Optionally, the method for dividing the display area also includes:

[0127] The first area and the second area are divided into two sub-display areas respectively.

[0128] Specifically, refer to Fig.16 and Fig.17 As shown, in order to meet the application requirements of the narrow frame of the display panel 10, in some embodiments, a part of the fan-out wiring F1 is arranged between two adjacent sub-pixels 20 in the first area A1 of the display area AA, and is connected to the sub-pixel 20 in the second area A2 of the display area AA by winding or the like. However, in the arrangement of the fan-out wiring F1, if the entire display panel 10 adopts the same grayscale characteristic parameter and gain parameter comparison table, when displaying at low brightness and low grayscale 100%, due to the influence of the fan-out wiring F1 between the adjacent sub-pixels 20, an "eight"-shaped Mura problem is prone to occur, that is, the display in the first area A1 is uneven, affecting the display effect. However, if the Demura in the prior art is used to compensate for the Mura, over-compensation will occur in the high grayscale, and it is difficult to solve the "eight"-shaped Mura problem.

[0129] Based on this, the embodiment of the present invention can divide the display area AA into at least two areas according to the area of ​​'eight'-shaped Mura, the first area A1 can also be called an 'eight'-shaped Mura area, and the second area A2 can also be called a non-'eight'-shaped Mura area, and the first area A1 and the second area A2 are respectively divided into two sub-display areas, for example, the first area A1 is divided into a first sub-display area V10, and the second area A2 is divided into a second sub-display area V11, and according to the display unevenness of each area, a grayscale characteristic parameter and a gain parameter comparison table are respectively set for the first sub-display area V10 and the second sub-display area V11 to achieve the optimal brightness compensation effect.

[0130] On the basis of the above embodiment, the second area A2 can be further divided into a plurality of sub-display areas. According to the display unevenness of each area, a corresponding grayscale characteristic parameter and gain parameter comparison table is set for each sub-display area to achieve the best brightness compensation effect.

[0131] Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel provided by the above embodiment. Fig.18 A schematic diagram of a display device according to an embodiment of the present invention is provided. Fig.18 As shown, the display device 100 includes any one of the display panels 10 provided in the above embodiments. Therefore, the display device also has the beneficial effects of the display panels in the above embodiments. The similarities can be understood by referring to the above explanation of the display panel, which will not be repeated here.

[0132] The display device 100 provided in the embodiment of the present invention can be Fig.18 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, industrial control equipment, medical display screens, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0133] Continue to refer Fig.18 As shown, optionally, the display device also includes a driver chip IC, in which a grayscale characteristic parameter and gain parameter comparison table is pre-stored. The driver chip IC is used to determine the gain parameter value according to the grayscale characteristic parameter and gain parameter comparison table when the display panel 10 displays, so as to compensate for the uneven display of the display panel 10.

[0134] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for compensating uneven display of a display panel, characterized in that: include: Obtaining a display unevenness compensation value of a picture to be displayed on the display panel; Determining grayscale characteristic parameters according to the display unevenness compensation value; According to the grayscale characteristic parameter, searching a grayscale characteristic parameter and gain parameter comparison table to determine a gain parameter value corresponding to the grayscale characteristic parameter; Performing display unevenness compensation on a display picture of the display panel according to the display unevenness compensation value and the gain parameter value; Wherein, the grayscale characteristic parameter and gain parameter comparison table is pre-stored in the display panel.

2. The display unevenness compensation method of a display panel according to claim 1, characterized in that: The display panel includes a storage unit, and obtaining a display unevenness compensation value of a picture to be displayed on the display panel includes: Acquiring display unevenness compensation data stored in the storage unit; The display unevenness compensation data is decompressed to obtain the display unevenness compensation value.

3. The display unevenness compensation method of a display panel according to claim 2, characterized in that: The display unevenness compensation value is the difference between the actual display brightness and the expected display brightness, and the display unevenness compensation value is determined in the following manner: Control the display panel to display the test screen; Using a camera to shoot the test screen to obtain shooting data of the test screen; The difference between the actual display brightness and the expected display brightness is calculated according to the photographing data.

4. The method for compensating uneven display of a display panel according to claim 3, characterized in that: Controlling the display panel to display a test screen includes at least one of the following: Control the monochrome test screen of the display panel at different refresh rates; Control the monochrome test screen of the display panel at different maximum brightness; Controls the monochrome test images of the display panel at different grayscales.

5. The display unevenness compensation method of a display panel according to claim 1, characterized in that: Determining grayscale characteristic parameters according to the display unevenness compensation value includes: Get the maximum value offset of the display unevenness compensation value max and minimum offset min ; Determine the grayscale characteristic parameter as offset max -offset min .

6. The method for compensating uneven display of a display panel according to claim 1, characterized in that: Before obtaining the display unevenness compensation value of the picture to be displayed on the display panel, the method further includes: A gain parameter determination experiment is performed using multiple display panels to calibrate the grayscale characteristic parameter and gain parameter comparison table.

7. The method for compensating uneven display of a display panel according to claim 6, wherein: The grayscale characteristic parameter and gain parameter comparison table includes a plurality of grayscale characteristic parameter values ​​of gradient distribution and corresponding gain parameters, and a gain parameter determination experiment is performed using a plurality of display panels to calibrate the grayscale characteristic parameter and gain parameter comparison table, including: Under a gradient of a certain grayscale characteristic parameter, performing a display unevenness compensation test on a plurality of the display panels, and recording a plurality of groups of gain compensation values; Averaging the multiple groups of gain compensation values ​​to determine the gain parameter value under the grayscale characteristic parameter gradient; The same experiment is performed under all grayscale characteristic parameter gradients, and the average value of each gain compensation value is recorded as the corresponding gain parameter value to obtain a grayscale characteristic parameter and gain parameter comparison table.

8. The method for compensating uneven display of a display panel according to claim 1, wherein: The larger the value of the grayscale characteristic parameter is, the larger the value of the gain parameter is.

9. The method for compensating uneven display of a display panel according to claim 8, characterized in that: The value of the grayscale characteristic parameter is less than or equal to 32, and the value of the gain parameter is less than or equal to 1.

6.

10. The display unevenness compensation method of a display panel according to claim 1, characterized in that: According to the display unevenness compensation value and the gain parameter value, performing display unevenness compensation on the display picture of the display panel includes: According to gray on =gray off +Gain×offset to compensate for uneven display; Among them gray on Indicates the brightness after compensation, gray off represents the brightness before compensation, Gain represents the gain parameter value, and offset represents the display unevenness compensation value.

11. The display unevenness compensation method of a display panel according to claim 1, characterized in that: After performing display unevenness compensation on the display screen of the display panel according to the display unevenness compensation value and the gain parameter value, the method further includes: The compensated display screen is tested, and if uneven display still exists, the gain parameter value is adjusted to perform uneven display compensation again until the compensation requirement is met.

12. The display unevenness compensation method of a display panel according to claim 1, characterized in that: The display area of ​​the display panel is divided into at least two sub-display areas, and the at least two sub-display areas correspond to different grayscale characteristic parameter and gain parameter comparison tables respectively.

13. A display panel, characterized in that: The display panel adopts the display unevenness compensation method according to any one of claims 1 to 12 to improve display uniformity during display.

14. A display device, characterized in that: Comprising the display panel as claimed in claim 13.

15. The display device according to claim 14, characterized in that: It also includes a driving chip, which pre-stores a grayscale characteristic parameter and gain parameter comparison table. The driving chip is used to determine the gain parameter value according to the grayscale characteristic parameter and gain parameter comparison table when the display panel displays, so as to compensate for the uneven display of the display panel.

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