Display panel, driving method, driving device and brightness compensation method thereof

Abstract

The application discloses a display panel, a driving method, a driving device and a brightness compensation method. The driving method comprises the following steps: obtaining a target display gray scale corresponding to a to-be-compensated gray scale of a to-be-compensated sub-pixel, wherein the target display gray scale is a gray scale after actually compensating the to-be-compensated gray scale; calculating a gamma voltage corresponding to the target display gray scale according to a gamma voltage corresponding to the to-be-compensated gray scale and a gamma voltage corresponding to a theoretical compensation gray scale stored in the display panel, wherein the theoretical compensation gray scale is a gray scale after theoretically compensating the to-be-compensated gray scale, the to-be-compensated gray scale is greater than a set gray scale, the target display gray scale is greater than the to-be-compensated gray scale and is not greater than the theoretical compensation gray scale; and inputting the gamma voltage corresponding to the target display gray scale to the to-be-compensated sub-pixel, so that a difference between an actual display brightness of the to-be-compensated sub-pixel and a theoretical brightness corresponding to the to-be-compensated gray scale is less than a preset value. The compensation effect on high gray scale brightness of the display panel is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel and its driving method, driving device and brightness compensation method. Background Technology

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

[0003] Existing organic light-emitting diode (OLED) display panels typically include multiple sub-pixels. During image display, corresponding data needs to be provided to each sub-pixel to achieve different grayscale levels. Due to factors such as materials and manufacturing processes, some products exhibit uneven brightness (mura) in the displayed image. Current technologies typically utilize demura compensation devices, including cameras, to address this mura issue.

[0004] However, existing technologies have the problem of poor compensation for high grayscale brightness in display panels, such as 255 grayscale brightness. Summary of the Invention

[0005] This invention provides a display panel and its driving method, driving device and brightness compensation method to improve the compensation effect on high grayscale brightness of the display panel.

[0006] According to one aspect of the present invention, a method for driving a display panel is provided, comprising:

[0007] Obtain the target display gray level corresponding to the gray level to be compensated of the sub-pixel to be compensated in the display panel, wherein the target display gray level is the gray level after the gray level to be compensated is actually compensated;

[0008] The gamma voltage corresponding to the target display gray level is calculated based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level stored in the display panel; wherein, the theoretically compensated gray level is the gray level after theoretically compensating the gray level to be compensated, the gray level to be compensated is greater than a set gray level, and the target display gray level is greater than the gray level to be compensated and less than or equal to the theoretically compensated gray level.

[0009] The gamma voltage corresponding to the target display grayscale is input to the sub-pixel to be compensated, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the grayscale to be compensated is less than a preset value.

[0010] Optionally, the gamma voltage corresponding to the target display grayscale is calculated based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretically compensated grayscale stored in the display panel, including:

[0011] Based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level, the gamma voltage corresponding to the target display gray level is calculated using an interpolation algorithm.

[0012] Optionally, the grayscale to be compensated includes the maximum display grayscale of the display panel, and the theoretically compensated grayscale is greater than the maximum display grayscale of the display panel.

[0013] Optionally, the gamma voltage corresponding to the theoretically compensated gray level is determined based on the correspondence between the brightness value and the gamma voltage, the ratio of the theoretical brightness value to the actual brightness value, and the theoretical brightness value.

[0014] Optionally, before obtaining the target display grayscale of the sub-pixel to be compensated in the display panel at the grayscale to be compensated, the method further includes:

[0015] Determine the display grayscale of each sub-pixel in the display panel in the next frame of the display image;

[0016] Based on the display grayscale of each sub-pixel in the next frame, determine the sub-pixel to be compensated in the next frame; the display grayscale of the sub-pixel to be compensated in the next frame is the grayscale to be compensated.

[0017] According to another aspect of the present invention, a driving device for a display panel is provided, comprising:

[0018] The acquisition unit is used to acquire the target display gray level of the sub-pixel to be compensated in the display panel under the gray level to be compensated, wherein the target display gray level is the gray level after the gray level to be compensated is actually compensated.

[0019] The calculation unit is used to calculate the gamma voltage of the target display grayscale based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage of the theoretically compensated grayscale stored in the display panel; wherein, the theoretically compensated grayscale is the grayscale after theoretically compensating the grayscale to be compensated, the grayscale to be compensated is greater than a set grayscale, and the target display grayscale is greater than the grayscale to be compensated and less than or equal to the theoretically compensated grayscale.

[0020] The driving unit is used to input the gamma voltage corresponding to the target display grayscale to the sub-pixel to be compensated when displaying the image, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the grayscale to be compensated is less than a preset value.

[0021] According to another aspect of the present invention, a brightness compensation method for a display panel is provided, comprising:

[0022] Obtain the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated, and the theoretical brightness value corresponding to the grayscale to be compensated;

[0023] Based on the correspondence between brightness value and gamma voltage, the theoretical brightness value, and the actual brightness value, the gamma voltage corresponding to the theoretical compensation gray level of the sub-pixel to be compensated is determined; the theoretical compensation gray level is the gray level after theoretically compensating the gray level to be compensated.

[0024] Based on the theoretical compensation grayscale and its gamma voltage, the target display grayscale corresponding to the grayscale to be compensated is determined, and the gamma voltage corresponding to the theoretical compensation grayscale and the target display grayscale are stored in the display panel; wherein, the target display grayscale is the grayscale after actually compensating the grayscale to be compensated, and the difference between the brightness value of the sub-pixel to be compensated when displaying the target display grayscale and the theoretical brightness value corresponding to the grayscale to be compensated is less than a preset value; the grayscale to be compensated is greater than a set grayscale, and the target display grayscale is greater than the grayscale to be compensated and less than or equal to the theoretical compensation grayscale.

[0025] Optionally, based on the correspondence between luminance value and gamma voltage, the theoretical luminance value, and the actual luminance value, the gamma voltage corresponding to the theoretical compensation grayscale of the sub-pixel to be compensated is determined, including:

[0026] The compensation coefficient is determined based on the ratio of the theoretical brightness value to the actual brightness value;

[0027] The theoretical compensation brightness of the sub-pixel to be compensated is determined by multiplying the compensation coefficient by the theoretical brightness value.

[0028] The gamma voltage corresponding to the theoretically compensated gray level is determined based on the correspondence between the brightness value and the gamma voltage and the theoretically compensated brightness.

[0029] Preferably, determining the gamma voltage corresponding to the theoretically compensated grayscale based on the correspondence between luminance values ​​and gamma voltages and the theoretically compensated luminance includes:

[0030] Based on the correspondence between brightness value and gamma voltage, the gamma voltage corresponding to the theoretically compensated brightness is determined.

[0031] Determine whether the gamma voltage corresponding to the theoretically compensated brightness exceeds the maximum output voltage of the display panel;

[0032] If it does not exceed the limit, then the gamma voltage corresponding to the theoretical compensation brightness is determined as the gamma voltage of the theoretical compensation gray level;

[0033] If the voltage exceeds the limit, the maximum output voltage of the display panel is determined to be the gamma voltage of the theoretically compensated grayscale.

[0034] Optionally, the target display grayscale corresponding to the grayscale to be compensated is determined based on the theoretical compensation grayscale and the gamma voltage of the theoretical compensation grayscale, including:

[0035] Based on the minimum adjustment gradient of the grayscale of the display panel, the displayable grayscale between the theoretical compensation grayscale and the grayscale to be compensated is determined; wherein, the displayable grayscale is less than or equal to the theoretical compensation grayscale and greater than the grayscale to be compensated;

[0036] The sub-pixels to be compensated are controlled to display each of the displayable gray levels in sequence, and the displayable gray level with the smallest difference from the theoretical brightness value is determined.

[0037] The displayable grayscale with the smallest difference from the theoretical brightness value is taken as the target display grayscale corresponding to the grayscale to be compensated.

[0038] According to another aspect of the present invention, a display panel is provided, including a driving device for the display panel described in any embodiment of the present invention.

[0039] The technical solution provided in this embodiment of the invention obtains the target display gray level corresponding to the gray level to be compensated of the sub-pixel to be compensated in the display panel during the driving process. The target display gray level is the gray level after the gray level to be compensated is actually compensated. The gamma voltage corresponding to the target display gray level is calculated based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretical compensation gray level. The gamma voltage corresponding to the target display gray level is input to the sub-pixel to be compensated to drive the sub-pixel to be compensated to emit light. The theoretical compensation gray level is the gray level after the gray level to be compensated is theoretically compensated. The gray level to be compensated is a high gray level greater than a set gray level. The target display gray level is greater than the gray level to be compensated and less than or equal to the theoretical compensation gray level. Since the gamma voltage of the target display grayscale is calculated by the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretical compensation grayscale, and the gamma voltage of the theoretical compensation grayscale is determined based on the correspondence between the brightness value and the gamma voltage, the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated, and the theoretical brightness value corresponding to the grayscale to be compensated, the gamma voltage of the theoretical compensation grayscale can be adaptively adjusted according to the Mura of the sub-pixel to be compensated when displaying the grayscale to be compensated, and then the gamma voltage corresponding to the target display grayscale can be adaptively adjusted so that the compensation result is close to the target brightness of the grayscale to be compensated, thus improving the compensation effect for high grayscales in the display panel. Attached Figure Description

[0040] Figure 1 This is a schematic diagram illustrating the principle of brightness compensation provided in the prior art;

[0041] Figure 2 This is a flowchart of a driving method for a display panel provided in an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of a gamma curve provided in an embodiment of the present invention;

[0043] Figure 4 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0044] Figure 5 This is a flowchart of another display panel driving method provided in an embodiment of the present invention;

[0045] Figure 6 This is a flowchart of a brightness compensation method for a display panel provided in an embodiment of the present invention. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0047] As mentioned in the background technology, Mura is a common defect in OLED (Organic Light-Emitting Diode) display technology. It is mainly caused by the immaturity of TFT (Thin Film Transistor) technology, resulting in large differences in the characteristics of each TFT. Demura is a compensation method for mura defects. In the process of driving the display panel, the commonly used method is to change the brightness by increasing or decreasing the current grayscale value. Figure 1 This is a schematic diagram illustrating the principle of brightness compensation provided in existing technology, for reference. Figure 1A sub-pixel has a theoretical brightness of L2 when its grayscale value is x1, while its actual brightness is L1. Similarly, a sub-pixel has an actual brightness of L2 when its grayscale value is x2. Therefore, when a sub-pixel needs to display a grayscale value of x1, the grayscale value input to the sub-pixel can be increased. The increased grayscale value Δx = x2 - x1. In other words, when a sub-pixel needs to display a grayscale value of x1, by inputting a grayscale value of x2 to the sub-pixel, the actual brightness of the sub-pixel becomes L2, satisfying the Gamma 2.2 curve. When the OLED display panel is lit, it presents a display effect that best matches the visual curve. For example, when the total grayscale range is 0–255, if the actual brightness of a sub-pixel displaying a grayscale value of 239 is less than the theoretical brightness of 239, the grayscale value can be increased. This can be achieved by driving the sub-pixel with a gamma voltage at grayscale value 241, thus compensating for the sub-pixel's brightness. However, for high grayscale levels in display panels, 255 grayscale is already the maximum grayscale value, and brightness cannot be increased by adding more grayscale values. Therefore, there is a problem of difficulty in compensating for sub-pixels at the 255 grayscale level. Currently, compensation for the 255 grayscale level is achieved by virtually increasing the gamma voltage above 255 grayscale; or by calculating a gamma voltage higher than 255 grayscale through linear extrapolation, and then using the calculated gamma voltage to compensate for the 255 grayscale level. However, existing methods for compensating for high grayscale levels do not consider the specific Mura condition of the 255 grayscale level, and such compensation methods have not achieved satisfactory results.

[0048] Based on this, embodiments of the present invention provide a driving method for a display panel. Figure 2 This is a flowchart of a display panel driving method provided in an embodiment of the present invention, see reference. Figure 2 The driving methods for the display panel include:

[0049] S110. Obtain the target display gray level corresponding to the gray level to be compensated of the sub-pixel to be compensated in the display panel. The target display gray level is the gray level after the gray level to be compensated is actually compensated.

[0050] Specifically, the display panel includes multiple pixel units arranged in an array. Each pixel unit can include at least three sub-pixels with different emitting colors, such as red, green, and blue sub-pixels. Each sub-pixel is a light-emitting diode (LED). The sub-pixels to be compensated are those in the display screen that cannot emit light normally. A sub-pixel that cannot emit light normally can be understood as one that cannot reach the theoretical brightness value of at least one display grayscale. The grayscale where the sub-pixel to be compensated cannot emit light normally is the grayscale to be compensated. That is, the actual brightness value of the sub-pixel at the grayscale to be compensated is different from the theoretical brightness value of the grayscale to be compensated. Each sub-pixel to be compensated can have one or more grayscales to be compensated. For example, a sub-pixel to be compensated can have only grayscale 255; a sub-pixel to be compensated needs compensation for all grayscales from 239 to 255.

[0051] The grayscale to be compensated for a sub-pixel is its display grayscale in the next frame under normal conditions, i.e., the grayscale to be displayed. Compensating for the brightness of the sub-pixel by using the brightness of the target display grayscale can be understood as ensuring that the actual brightness value of the sub-pixel at the target display grayscale is the same as, or only slightly different from, the theoretical brightness value of the grayscale to be compensated. By inputting the target display grayscale to the sub-pixel, the actual brightness value of the sub-pixel to be compensated is made the same as, or only slightly different from, the theoretical brightness value of the grayscale to be compensated. The target display grayscale is pre-stored in the display panel. The specific method for determining the target display grayscale can be found in the following embodiment.

[0052] The number of sub-pixels to be compensated in the display panel may be multiple. Each sub-pixel to be compensated can have one or more gray levels to be compensated. Furthermore, different sub-pixels to be compensated can have the same or different target display gray levels at the same gray level. When different sub-pixels to be compensated have the same Mura condition at the same gray level, then the different sub-pixels to be compensated have the same target display gray level at the same gray level; when different sub-pixels to be compensated have different Mura conditions at the same gray level, then the different sub-pixels to be compensated may have different or the same target display gray levels at the same gray level. The target display gray level is determined based on the Mura condition of the sub-pixels to be compensated when displaying the gray level to be compensated.

[0053] S120. Calculate the gamma voltage corresponding to the target display gray level based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level stored in the display panel; wherein, the theoretically compensated gray level is the gray level after theoretically compensating the gray level to be compensated, the gray level to be compensated is greater than the set gray level, and the target display gray level is greater than the gray level to be compensated, but less than or equal to the theoretically compensated gray level.

[0054] Specifically, each grayscale level corresponds to a gamma voltage, and different grayscale levels correspond to different gamma voltages. Normally, after inputting a gamma voltage to a sub-pixel, the brightness value of the light emitted by the sub-pixel is equal to the theoretical brightness value of the corresponding grayscale level. However, after inputting the gamma voltage corresponding to the grayscale level to be compensated to the sub-pixel, the brightness value of the light emitted by the sub-pixel is not equal to the theoretical brightness value of that grayscale level. The actual brightness value of the sub-pixel to be compensated at the target display grayscale is the same as, or only slightly different from, the theoretical brightness value of the grayscale level to be compensated. Therefore, it is necessary to input the gamma voltage corresponding to the target display grayscale level to the sub-pixel to compensate for brightness compensation.

[0055] The theoretical compensation grayscale is a grayscale value calculated based on the actual brightness value of the sub-pixel to be compensated and the theoretical brightness value corresponding to the grayscale level to be compensated. The theoretical compensation grayscale can be set according to the actual brightness value of the sub-pixel when displaying the grayscale level to be compensated and the theoretical brightness value corresponding to the grayscale level to be compensated. Specifically, a brightness value is calculated based on the actual brightness value of the sub-pixel when displaying the grayscale level to be compensated and the theoretical brightness value corresponding to the grayscale level to be compensated; this brightness value is the theoretical brightness value corresponding to the theoretical compensation grayscale. When the theoretical brightness value corresponding to the theoretical compensation grayscale is less than or equal to the theoretical brightness value of the maximum grayscale level in the display panel, the theoretical compensation grayscale is a grayscale level within the range of the minimum and maximum grayscale levels in the display panel. When the theoretical brightness value corresponding to the theoretical compensation grayscale is greater than the theoretical brightness value of the maximum grayscale level in the display panel, the theoretical compensation grayscale is a virtual grayscale level greater than the maximum grayscale level in the display panel. The gamma voltage corresponding to the theoretical compensation grayscale is pre-stored in the display panel; that is, the display panel includes a register that records the register value of the gamma voltage of the theoretical compensation grayscale. The gamma voltage corresponding to the theoretical compensation gray level is determined based on the correspondence between the brightness value and the gamma voltage, the actual brightness value of the sub-pixel to be compensated when displaying the gray level to be compensated, and the theoretical brightness value corresponding to the gray level to be compensated.

[0056] The specific method for determining the gamma voltage corresponding to the theoretical compensation grayscale can include: obtaining the theoretical brightness value of the grayscale to be compensated, and obtaining the actual brightness value of the sub-image to be compensated when displaying the grayscale to be compensated through a precision measurement camera; calculating the theoretical compensation brightness value of the theoretical compensation grayscale based on the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated and the theoretical brightness value corresponding to the grayscale to be compensated; determining the gamma voltage corresponding to the theoretical compensation grayscale based on the theoretical brightness value of the theoretical compensation grayscale and the correspondence between the brightness value and the gamma voltage. The specific method for determining the target display grayscale can include: inputting the gamma voltage corresponding to the theoretical compensation grayscale to the sub-pixel to be compensated, and detecting the actual brightness value of the sub-pixel to be compensated; decreasing the gamma voltage input to the sub-pixel to be compensated according to a preset gradient, and detecting the actual brightness value of the sub-pixel to be compensated after each input of gamma voltage; determining the display grayscale corresponding to the brightness with the smallest difference from the theoretical brightness value of the grayscale to be compensated, and recording it as the target display grayscale when the sub-pixel to be compensated displays the grayscale to be compensated.

[0057] In this invention, the grayscale to be compensated is greater than a set grayscale. The grayscale to be compensated in this embodiment is for large grayscale values ​​in the display panel, enabling compensation when the actual brightness value is lower than the theoretical brightness value at high grayscale levels. The grayscale value of the target display grayscale and the grayscale value of the theoretical compensation grayscale can be greater than the maximum display grayscale of the display panel. In this embodiment, the gamma voltage corresponding to the target display grayscale is calculated based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretical compensation grayscale. The gamma voltage of the theoretical compensation grayscale is determined based on the correspondence between brightness value and gamma voltage, the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated, and the theoretical brightness value corresponding to the grayscale to be compensated. Therefore, the gamma voltage of the theoretical compensation grayscale can be adaptively adjusted according to the Mura intensity of the sub-pixel to be compensated when displaying the grayscale to be compensated, thereby adaptively adjusting the gamma voltage corresponding to the target display grayscale. This enables adaptive compensation for different grayscale to be compensated, preventing grayscale confusion.

[0058] S130. Input the gamma voltage corresponding to the target display gray level to the sub-pixel to be compensated, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the gray level to be compensated is less than a preset value.

[0059] Specifically, based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretically compensated grayscale, the gamma voltage corresponding to the target display grayscale is calculated. The calculated gamma voltage is then input to the corresponding sub-image to be compensated, causing the sub-pixel to emit light according to the calculated gamma voltage. This allows for the adjustment of the brightness of the sub-image to meet the requirement that it can display the theoretical brightness value of the grayscale to be compensated, or a value close to it.

[0060] The technical solution provided by this invention involves obtaining the target display grayscale corresponding to the grayscale to be compensated of the sub-pixel to be compensated in the display panel; calculating the gamma voltage corresponding to the target display grayscale based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretical compensation grayscale; and inputting the gamma voltage corresponding to the target display grayscale to the sub-pixel to be compensated to drive the sub-pixel to emit light. The grayscale to be compensated is a high grayscale greater than a set grayscale, and the target display grayscale is greater than the grayscale to be compensated and less than or equal to the theoretical compensation grayscale. Since the gamma voltage of the target display grayscale is calculated by the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretical compensation grayscale, and the gamma voltage of the theoretical compensation grayscale is determined based on the correspondence between the brightness value and the gamma voltage, the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated, and the theoretical brightness value corresponding to the grayscale to be compensated, the gamma voltage of the theoretical compensation grayscale can be adaptively adjusted according to the Mura of the sub-pixel to be compensated when displaying the grayscale to be compensated, and then the gamma voltage corresponding to the target display grayscale can be adaptively adjusted so that the compensation result is close to the theoretical brightness of the grayscale to be compensated, i.e., the target brightness, thus improving the compensation effect for high grayscales in the display panel.

[0061] Optionally, in this embodiment of the invention, the driving method is applicable to the largest display grayscale in the display panel, that is, the grayscale to be compensated includes the largest display grayscale of the display panel, and the theoretical compensation grayscale and the target display grayscale are greater than the largest display grayscale of the display panel. Figure 3 This is a schematic diagram of a gamma curve provided in an embodiment of the present invention, for reference. Figure 3 For example, the full grayscale of the display panel is 0-255, meaning the maximum grayscale is 255. The grayscale to be compensated is 255, and the theoretical compensation grayscale and the target display grayscale are both greater than 255. The gamma voltage corresponding to the theoretical compensation grayscale of 256 is determined based on the correspondence between brightness value and gamma voltage, the actual brightness value of the sub-pixel to be compensated when displaying 255 grayscale, and the theoretical brightness value corresponding to 255 grayscale, and is stored in the display panel. This is equivalent to extending the gamma curve to 256 grayscale based on the Mura condition of the sub-pixel to be compensated at 255 grayscale, and then using the grayscale between 256 and 255 grayscale to compensate for the brightness of the 255 grayscale.

[0062] Because the gamma voltage of the theoretical compensation gray level corresponding to the gray level to be compensated needs to be stored in advance, if the method provided in this embodiment is used for every gray level to be compensated for every sub-pixel, the number of registers in the display panel will be extremely large. Therefore, for gray levels to be compensated that are lower than the maximum gray level, compensation can be achieved by increasing or decreasing the gray level value, that is, by using the original voltage data of the display panel. For the maximum display gray level of the display panel, the gamma voltage corresponding to the target display gray level can be calculated based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretical compensation gray level.

[0063] Figure 4 This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 4 The driving methods for the display panel include:

[0064] S210. Obtain the target display gray level corresponding to the gray level to be compensated of the sub-pixel to be compensated in the display panel. The target display gray level is the gray level after the gray level to be compensated is actually compensated.

[0065] S220. Based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level stored in the display panel, calculate the gamma voltage corresponding to the target display gray level through an interpolation algorithm; wherein, the theoretically compensated gray level is the gray level after theoretically compensating the gray level to be compensated, the gray level to be compensated is greater than the set gray level, and the target display gray level is greater than the gray level to be compensated, and less than or equal to the theoretically compensated gray level.

[0066] Specifically, in the process of calculating the gamma voltage corresponding to the target display gray level based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level, the gamma voltage corresponding to the target display gray level can be calculated by interpolation algorithm.

[0067] When calculating the gamma voltage corresponding to the target display grayscale using an interpolation algorithm, the register value of the gamma voltage of the grayscale to be compensated and the register value of the gamma voltage of the theoretically compensated grayscale can be obtained first. Then, the register value of the target display grayscale can be calculated using linear interpolation. The interpolation calculation can be based on the following formula:

[0068] D N =D A *(NB) / (AB)+D B *(AN) / (AB),

[0069] Where A, B, and N are the theoretical compensation grayscale, the grayscale to be compensated, and the target display grayscale, respectively; D A D B D N These are the register values ​​corresponding to the theoretically compensated grayscale, the register value corresponding to the grayscale to be compensated, and the register value corresponding to the target display grayscale. The display panel can output the corresponding gamma voltage based on the register value corresponding to the target display grayscale.

[0070] S230. Input the gamma voltage corresponding to the target display gray level to the sub-pixel to be compensated, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the gray level to be compensated is less than a preset value.

[0071] The technical solution provided by this invention, based on the above embodiments, calculates the gamma voltage corresponding to the target display gray level through an interpolation algorithm according to the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level. While realizing the adaptive adjustment of the gamma voltage corresponding to the target display gray level according to the Mura weight of the sub-pixels, it simplifies the calculation method of the gamma voltage corresponding to the target display gray level.

[0072] Optionally, the gamma voltage corresponding to the theoretically compensated grayscale is determined based on the correspondence between luminance value and gamma voltage, the ratio of theoretical luminance value to actual luminance value, and the theoretical luminance value itself. Specifically, this can be achieved by detecting the actual luminance value of the sub-pixel to be compensated when displaying the grayscale to be compensated; determining the compensation coefficient based on the ratio of the theoretical luminance value to the actual luminance value of the grayscale to be compensated; determining the theoretical compensated luminance of the sub-pixel to be compensated based on the product of the compensation coefficient and the theoretical luminance value; and determining the gamma voltage corresponding to the theoretically compensated grayscale based on the correspondence between luminance value and gamma voltage and the theoretical compensated luminance.

[0073] The compensation coefficient can be adjusted according to the severity of the mura (mura) of the sub-pixel being compensated when displaying the grayscale to be compensated. When the mura is heavier, the compensation coefficient will increase, and vice versa. This embodiment can adaptively adjust the compensation coefficient according to the changes in the mura severity, thus providing better compensation for the sub-pixel.

[0074] Figure 5 This is a flowchart of another display panel driving method provided in an embodiment of the present invention, see reference. Figure 5 The driving methods for the display panel include:

[0075] S310. Determine the display grayscale of each sub-pixel in the display panel in the next frame of the display screen, and determine the sub-pixel to be compensated in the next frame of the display screen based on the display grayscale of each sub-pixel in the next frame of the display screen; the display grayscale of the sub-pixel to be compensated in the next frame of the display screen is the grayscale to be compensated.

[0076] Specifically, the display panel includes multiple arrayed sub-pixels, so the number of sub-pixels to be compensated may be multiple. The grayscale of the sub-pixel to be compensated in the next frame is the grayscale to be compensated. The grayscale to be compensated for different sub-pixels can be the same or different. For example, the grayscale to be compensated for the sub-pixel located at the first position is grayscale 255, and the grayscale to be compensated for the sub-pixel located at the second position is grayscale 241. After determining the grayscale of each sub-pixel in the display panel in the next frame, it can be determined whether there are any sub-pixels that need compensation. For example, if the next frame is a 255 grayscale image, then all sub-pixels in the display panel will have a grayscale of 255 in the next frame. The display panel stores the position information, the corresponding target grayscale, and the gamma voltage of the theoretical compensation grayscale for sub-pixels that have a difference between their actual brightness value and theoretical brightness value at grayscale 255 (i.e., sub-pixels to be compensated).

[0077] Different sub-pixels to be compensated can have the same or different target display grayscale levels at the same grayscale level. When different sub-pixels to be compensated have the same Mura condition at the same grayscale level, then the target display grayscale and the gamma voltage corresponding to the theoretically compensated grayscale are the same. When different sub-pixels to be compensated have different Mura conditions at the same grayscale level, then the gamma voltage corresponding to the theoretically compensated grayscale is different, and the target display grayscale may be the same or different, and the gamma voltage corresponding to the target display grayscale is different.

[0078] S320. Obtain the target display gray level corresponding to the gray level to be compensated of the sub-pixel to be compensated in the display panel. The target display gray level is the gray level after the gray level to be compensated is actually compensated.

[0079] S330. Calculate the gamma voltage corresponding to the target display gray level based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level stored in the display panel; wherein, the theoretically compensated gray level is the gray level after theoretically compensating the gray level to be compensated, the gray level to be compensated is greater than the set gray level, and the target display gray level is greater than the gray level to be compensated and less than or equal to the theoretically compensated gray level.

[0080] S340. Input the gamma voltage corresponding to the target display gray level to the sub-pixel to be compensated, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the gray level to be compensated is less than a preset value.

[0081] The technical solution provided in this embodiment of the invention, based on the above embodiments, further includes, before obtaining the target display grayscale corresponding to the grayscale of the sub-pixel to be compensated in the display panel,: determining the display grayscale of each sub-pixel in the display panel in the next frame of the display image, and determining the sub-pixel to be compensated in the next frame of the display image based on the display grayscale of each sub-pixel in the next frame of the display image. By determining all sub-pixels to be compensated in the next frame of the display panel and performing corresponding compensation on each sub-pixel to be compensated, the display effect of the entire display image can be improved.

[0082] This invention also provides a driving device for a display panel, used to execute the driving method for the display panel described in any of the above embodiments; the driving device for the display panel includes:

[0083] The acquisition unit is used to acquire the target display gray level of the sub-pixel to be compensated in the display panel under the gray level to be compensated. The target display gray level is the gray level after the gray level to be compensated is actually compensated.

[0084] The calculation unit is used to calculate the gamma voltage of the target display gray level based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage of the theoretically compensated gray level stored in the display panel. The theoretically compensated gray level is the gray level after theoretically compensating the gray level to be compensated. The gray level to be compensated is greater than the set gray level. The target display gray level is greater than the gray level to be compensated and less than or equal to the theoretically compensated gray level.

[0085] The driving unit is used to input the gamma voltage corresponding to the target display grayscale to the sub-pixel to be compensated when displaying the image, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the grayscale to be compensated is less than a preset value.

[0086] Optionally, the calculation unit is also used to calculate the gamma voltage corresponding to the target display gray level by means of an interpolation algorithm, based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level.

[0087] Optionally, the grayscale to be compensated includes the maximum display grayscale of the display panel, and the theoretically compensated grayscale is greater than the maximum display grayscale of the display panel.

[0088] Optionally, the gamma voltage corresponding to the theoretically compensated gray level is determined based on the correspondence between the brightness value and the gamma voltage, the ratio of the theoretical brightness value to the actual brightness value, and the theoretical brightness value.

[0089] Optionally, the driving device for the display panel also includes:

[0090] The sub-pixel to be compensated determination unit is used to determine the display grayscale of each sub-pixel in the display panel in the next frame of the display image; and to determine the sub-pixel to be compensated in the next frame of the display image based on the display grayscale of each sub-pixel in the next frame of the display image; the display grayscale of the sub-pixel to be compensated in the next frame of the display image is the grayscale to be compensated.

[0091] This invention also provides a brightness compensation method for a display panel, used to obtain the gamma voltage of the target display grayscale and the theoretical compensation grayscale in the brightness compensation method of the display panel described in any of the above embodiments; Figure 6 This is a flowchart of a brightness compensation method for a display panel provided in an embodiment of the present invention, see reference. Figure 6 The brightness compensation methods for display panels include:

[0092] S410. Obtain the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated, and the theoretical brightness value corresponding to the grayscale to be compensated.

[0093] Specifically, by taking pictures of the display screen with a precision camera, the actual brightness value of each sub-pixel can be obtained. It is then determined whether the actual brightness value of each sub-pixel is the same as the theoretical brightness value of the corresponding display grayscale. If they are different, the sub-pixel to be compensated can be identified, and its actual brightness value can be determined simultaneously.

[0094] S420. Based on the correspondence between brightness value and gamma voltage, theoretical brightness value and actual brightness value, determine the gamma voltage corresponding to the theoretical compensation gray level of the sub-pixel to be compensated; the theoretical compensation gray level is the gray level after theoretically compensating the gray level to be compensated.

[0095] Specifically, inputting different gamma voltages to a sub-pixel will result in the sub-pixel emitting light of different brightness; that is, there is a corresponding curve relationship between the brightness value and the gamma voltage. It should be noted that the curve relationship between the brightness value and the gamma voltage here refers to the curve relationship between the theoretical brightness value and the gamma voltage. Therefore, by determining the theoretical brightness value of the theoretically compensated grayscale, and based on the theoretical brightness value of the theoretically compensated grayscale and the correspondence between the brightness value and the gamma voltage, the gamma voltage corresponding to the theoretically compensated grayscale can be determined. The theoretical brightness value of the theoretically compensated grayscale can be determined based on the theoretical brightness value and the actual brightness value of the grayscale to be compensated.

[0096] S430. Based on the theoretical compensation grayscale and the gamma voltage of the theoretical compensation grayscale, determine the target display grayscale corresponding to the grayscale to be compensated, and store the gamma voltage corresponding to the theoretical compensation grayscale and the target display grayscale in the display panel; wherein, the target display grayscale is the grayscale after the grayscale to be compensated is actually compensated, and the difference between the brightness value of the sub-pixel to be compensated when displaying the target display grayscale and the theoretical brightness value corresponding to the grayscale to be compensated is less than a preset value; the grayscale to be compensated is greater than the set grayscale, and the target display grayscale is greater than the grayscale to be compensated, and less than or equal to the theoretical compensation grayscale.

[0097] Specifically, the gamma voltage corresponding to the theoretical compensation gray level is input to the sub-pixel to be compensated, and the actual brightness value of the sub-pixel to be compensated is detected; the gamma voltage input to the sub-pixel to be compensated is reduced multiple times, and the actual brightness value of the sub-pixel to be compensated is detected after each adjustment of the gamma voltage; the display gray level corresponding to the brightness with the smallest difference from the theoretical brightness value of the gray level to be compensated is determined during the adjustment process from the gamma voltage of the theoretical compensation gray level to the gamma voltage of the gray level to be compensated, and recorded as the target display gray level when the sub-pixel to be compensated displays the gray level to be compensated.

[0098] Optionally, in step S420, based on the correspondence between luminance value and gamma voltage, the theoretical luminance value, and the actual luminance value, the gamma voltage corresponding to the theoretical compensation grayscale of the sub-pixel to be compensated is determined, including:

[0099] The compensation coefficient is determined based on the ratio of the theoretical brightness value to the actual brightness value;

[0100] The theoretical compensation brightness of the sub-pixel to be compensated is determined by multiplying the compensation coefficient by the theoretical brightness value.

[0101] The gamma voltage corresponding to the theoretical compensation grayscale is determined based on the correspondence between the brightness value and the gamma voltage, as well as the theoretical compensation brightness.

[0102] Specifically, the compensation coefficient can be adjusted based on the severity of the mura (duration) of the sub-pixel being compensated when displaying the grayscale to be compensated. When the mura is heavier, the compensation coefficient increases. The product of the compensation coefficient and the theoretical brightness value determines the theoretical compensation brightness of the sub-pixel being compensated; a higher theoretical compensation brightness leads to a higher gamma voltage corresponding to the theoretical compensation grayscale, based on the relationship between brightness value and gamma voltage, thus enhancing the compensation effect. Conversely, when the mura is lighter, the compensation coefficient decreases. The product of the compensation coefficient and the theoretical brightness value determines the theoretical compensation brightness of the sub-pixel being compensated; a lower theoretical compensation brightness leads to a lower gamma voltage corresponding to the theoretical compensation grayscale, based on the relationship between brightness value and gamma voltage. The compensation coefficient can be adaptively adjusted according to the changes in mura severity to achieve a reasonable optimal solution for the compensation result.

[0103] Optionally, the gamma voltage corresponding to the theoretical compensation grayscale is determined based on the correspondence between the luminance value and the gamma voltage and the theoretical compensation luminance, including:

[0104] Based on the correspondence between luminance value and gamma voltage, the gamma voltage corresponding to the theoretically compensated luminance is determined.

[0105] Determine whether the gamma voltage corresponding to the theoretically compensated brightness exceeds the maximum output voltage of the display panel;

[0106] If it does not exceed the limit, the gamma voltage corresponding to the theoretical compensation brightness will be determined as the gamma voltage of the theoretical compensation gray level.

[0107] If the value is exceeded, the maximum output voltage of the display panel will be determined as the theoretically compensated grayscale gamma voltage.

[0108] This can be understood as follows: since the display panel's output voltage has a maximum value, if the gamma voltage corresponding to the theoretically compensated brightness exceeds the display panel's maximum output voltage, the display panel cannot output the gamma voltage corresponding to the theoretically compensated brightness. In this case, the display panel's maximum output voltage is determined as the gamma voltage for the theoretically compensated grayscale. If the gamma voltage corresponding to the theoretically compensated brightness does not exceed the display panel's maximum output voltage, and the display panel can output the gamma voltage corresponding to the theoretically compensated brightness, then the gamma voltage corresponding to the theoretically compensated brightness is determined as the gamma voltage for the theoretically compensated grayscale.

[0109] Optionally, in step S430, the target display gray level corresponding to the gray level to be compensated is determined based on the theoretical compensation gray level and its gamma voltage, including:

[0110] Based on the minimum adjustment gradient of the grayscale of the display panel, determine the displayable grayscale between the theoretical compensation grayscale and the grayscale to be compensated; wherein, the displayable grayscale is less than or equal to the theoretical compensation grayscale and greater than the grayscale to be compensated.

[0111] Control the sub-pixels to be compensated to display each displayable gray level in sequence, and determine the displayable gray level with the smallest difference from the theoretical brightness value;

[0112] The displayable grayscale with the smallest difference from the theoretical brightness value is taken as the target display grayscale corresponding to the grayscale to be compensated.

[0113] Specifically, based on the minimum adjustment gradient of the grayscale of the display panel, the displayable grayscale between the theoretically compensated grayscale and the grayscale to be compensated is determined, with each displayable grayscale corresponding to a gamma voltage. The gamma voltages of each displayable grayscale are sequentially input to the sub-pixel to be compensated to drive it to display each displayable grayscale, and the actual brightness value of each displayable grayscale is detected. The displayable grayscale corresponding to the actual brightness value with the smallest difference from the theoretical brightness value of the grayscale to be compensated among the displayable grayscale between the theoretically compensated grayscale and the grayscale to be compensated is determined and recorded as the target display grayscale when the sub-pixel to be compensated displays that grayscale to be compensated.

[0114] For example, the gray level to be compensated is gray level 255, and the theoretical compensation gray level is gray level 256. Starting from gray level 256, the gradient of the gray level is adjusted according to the register value, with the smallest unit being 0.25 gray levels. This adjusts the gray level input to the sub-pixel to be compensated, finding the gray level with the best compensation effect. For example, if the gray level with the best compensation effect is 255.5, then the gray level value of 255.5 is saved; and the gamma voltage of gray level 256 is written into the register. During the display panel display process, when the sub-pixel of this Mura displays the gray level to be compensated, gray level 255, the gamma voltage corresponding to gray level 255 is calculated based on the gamma voltage corresponding to gray level 255 and the saved gamma voltage of gray level 256, using an interpolation algorithm. Then, the gamma voltage corresponding to gray level 255.5 is input to the sub-pixel of this Mura, thereby achieving compensation for gray level 255.

[0115] This invention also provides a display panel, including the driving device for the display panel described in any embodiment of this invention. It has the same technical effects and will not be repeated here.

[0116] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A driving method for a display panel, characterized in that, include: Obtain the target display gray level corresponding to the gray level to be compensated of the sub-pixel to be compensated in the display panel, wherein the target display gray level is the gray level after the gray level to be compensated is actually compensated; The gamma voltage corresponding to the target display gray level is calculated based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level stored in the display panel; wherein, the theoretically compensated gray level is the gray level after theoretically compensating the gray level to be compensated, the gray level to be compensated is greater than a set gray level, and the target display gray level is greater than the gray level to be compensated and less than or equal to the theoretically compensated gray level. The gamma voltage corresponding to the target display grayscale is input to the sub-pixel to be compensated, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the grayscale to be compensated is less than a preset value.

2. The driving method for the display panel according to claim 1, characterized in that, The gamma voltage corresponding to the target display grayscale is calculated based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage corresponding to the theoretically compensated grayscale stored in the display panel, including: Based on the gamma voltage corresponding to the gray level to be compensated and the gamma voltage corresponding to the theoretically compensated gray level, the gamma voltage corresponding to the target display gray level is calculated using an interpolation algorithm.

3. The driving method for the display panel according to claim 1, characterized in that, The grayscale to be compensated includes the maximum display grayscale of the display panel, and the theoretically compensated grayscale is greater than the maximum display grayscale of the display panel.

4. The driving method for a display panel according to claim 1, characterized in that, The gamma voltage corresponding to the theoretical compensation grayscale is determined based on the correspondence between the brightness value and the gamma voltage, the ratio of the theoretical brightness value corresponding to the grayscale to be compensated to the actual brightness value when the sub-pixel to be compensated displays the grayscale to be compensated, and the theoretical brightness value.

5. The driving method for a display panel according to claim 1, characterized in that, Before obtaining the target display grayscale of the sub-pixel to be compensated in the display panel at the grayscale to be compensated, the method further includes: Determine the display grayscale of each sub-pixel in the display panel in the next frame of the display image; Based on the display grayscale of each sub-pixel in the next frame, determine the sub-pixel to be compensated in the next frame; the display grayscale of the sub-pixel to be compensated in the next frame is the grayscale to be compensated.

6. A driving device for a display panel, characterized in that, include: The acquisition unit is used to acquire the target display gray level of the sub-pixel to be compensated in the display panel under the gray level to be compensated, wherein the target display gray level is the gray level after the gray level to be compensated is actually compensated. The calculation unit is used to calculate the gamma voltage of the target display grayscale based on the gamma voltage corresponding to the grayscale to be compensated and the gamma voltage of the theoretically compensated grayscale stored in the display panel; wherein, the theoretically compensated grayscale is the grayscale after theoretically compensating the grayscale to be compensated, the grayscale to be compensated is greater than a set grayscale, and the target display grayscale is greater than the grayscale to be compensated and less than or equal to the theoretically compensated grayscale. The driving unit is used to input the gamma voltage corresponding to the target display grayscale to the sub-pixel to be compensated when displaying the image, so that the difference between the actual display brightness of the sub-pixel to be compensated and the theoretical brightness corresponding to the grayscale to be compensated is less than a preset value.

7. A brightness compensation method for a display panel, characterized in that, include: Obtain the actual brightness value of the sub-pixel to be compensated when displaying the grayscale to be compensated, and the theoretical brightness value corresponding to the grayscale to be compensated; Based on the correspondence between brightness value and gamma voltage, the theoretical brightness value, and the actual brightness value, the gamma voltage corresponding to the theoretical compensation gray level of the sub-pixel to be compensated is determined; the theoretical compensation gray level is the gray level after theoretically compensating the gray level to be compensated. Based on the theoretical compensation grayscale and its gamma voltage, the target display grayscale corresponding to the grayscale to be compensated is determined, and the gamma voltage corresponding to the theoretical compensation grayscale and the target display grayscale are stored in the display panel; wherein, the target display grayscale is the grayscale after actually compensating the grayscale to be compensated, and the difference between the brightness value of the sub-pixel to be compensated when displaying the target display grayscale and the theoretical brightness value corresponding to the grayscale to be compensated is less than a preset value; the grayscale to be compensated is greater than a set grayscale, and the target display grayscale is greater than the grayscale to be compensated and less than or equal to the theoretical compensation grayscale.

8. The brightness compensation method for a display panel according to claim 7, characterized in that, Based on the correspondence between luminance value and gamma voltage, the theoretical luminance value, and the actual luminance value, the gamma voltage corresponding to the theoretical compensation grayscale of the sub-pixel to be compensated is determined, including: The compensation coefficient is determined based on the ratio of the theoretical brightness value to the actual brightness value; The theoretical compensation brightness of the sub-pixel to be compensated is determined by multiplying the compensation coefficient by the theoretical brightness value. The gamma voltage corresponding to the theoretically compensated gray level is determined based on the correspondence between the brightness value and the gamma voltage, as well as the theoretically compensated brightness.

9. The brightness compensation method for a display panel according to claim 8, characterized in that, Determining the gamma voltage corresponding to the theoretically compensated grayscale based on the correspondence between luminance values ​​and gamma voltages, and the theoretically compensated luminance, includes: Based on the correspondence between brightness value and gamma voltage, the gamma voltage corresponding to the theoretically compensated brightness is determined. Determine whether the gamma voltage corresponding to the theoretically compensated brightness exceeds the maximum output voltage of the display panel; If it does not exceed the limit, then the gamma voltage corresponding to the theoretical compensation brightness is determined as the gamma voltage of the theoretical compensation gray level; If the voltage exceeds the limit, the maximum output voltage of the display panel is determined to be the gamma voltage of the theoretically compensated grayscale.

10. The brightness compensation method for a display panel according to claim 7, characterized in that, Based on the theoretically compensated grayscale and the gamma voltage of the theoretically compensated grayscale, the target display grayscale corresponding to the grayscale to be compensated is determined, including: Based on the minimum adjustment gradient of the grayscale of the display panel, the displayable grayscale between the theoretical compensation grayscale and the grayscale to be compensated is determined; wherein, the displayable grayscale is less than or equal to the theoretical compensation grayscale and greater than the grayscale to be compensated; The sub-pixels to be compensated are controlled to display each of the displayable gray levels in sequence, and the displayable gray level with the smallest difference from the theoretical brightness value is determined. The displayable grayscale with the smallest difference from the theoretical brightness value is taken as the target display grayscale corresponding to the grayscale to be compensated.

11. A display panel, characterized in that, The driving device includes the display panel as described in claim 6.

Images