Display driving chip, display compensation method and display device

Abstract

The invention discloses a display driving chip, a display compensation method and a display device, and belongs to the technical field of display. The display driving chip comprises an acquisition module which is used for acquiring first display data when a target area of the display panel displays a first image of a target gray level lower than a reference gray level; the determining module is used for determining the target compensation gain of the target area when the first image is displayed based on the first display data and compensation mapping information indicating the corresponding relation between the first compensation data and the target compensation gain, the first compensation data is the compensation data of the target area when the second image of the reference gray level is displayed, and the second compensation gain is the compensation data of the target area when the second image of the reference gray level is displayed. The compensation mapping information is determined based on digital gamma data of the target area when the first image and the second image are displayed; and the calculation module is used for adjusting the first display data based on the target compensation gain to obtain second display data for displaying the first image in the target area so as to accurately compensate the image and improve the image display quality.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display driving chip, a display compensation method, and a display device. Background Art

[0002] When a display panel in a display device displays an image, due to the possible differences in the characteristics of different regions of the display panel, inaccurate problems may occur when the display panel displays an image. For example, when displaying an image of the same gray level, the brightness displayed in different regions is inconsistent. Therefore, it is necessary to compensate the images displayed in some regions of the display panel so that the brightnesses displayed in different regions approach consistency and improve the display quality of the image. Summary of the Invention

[0003] This application provides a display driving chip, a display compensation method, and a display device, which can be used to improve the image display quality. The technical solutions are as follows:

[0004] On the one hand, this application provides a display driving chip, including: an acquisition module, configured to acquire first display data of a target region of a display panel when displaying a first image of a target gray level, where the target gray level is lower than a reference gray level; a determination module, configured to determine a target compensation gain of the target region when displaying the first image based on the first display data and compensation mapping information, where the compensation mapping information indicates a correspondence between first compensation data and the target compensation gain, the first compensation data is compensation data of the target region when displaying a second image of the reference gray level, and the compensation mapping information is determined based on digital gamma data when the target region displays the first image and the second image; a calculation module, configured to adjust the first display data based on the target compensation gain to obtain second display data, and the second display data is used for the target region to display the first image.

[0005] In a possible implementation manner, the determination module is further configured to: acquire second compensation data of the target region when displaying the first image; determine the compensation mapping information based on the first compensation data and the second compensation data, and the target compensation gain is a ratio of the second compensation data to the first compensation data.

[0006] In a possible implementation, a determination module is configured to: obtain first historical digital gamma data when the first image was historically displayed in the target area, where the first historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with the reference area of the display panel as the center; obtain second historical digital gamma data when the first image was historically displayed in the target area, where the second historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with the target area as the center; and calculate the difference between the second historical digital gamma data and the first historical digital gamma data to obtain the second compensation data.

[0007] In a possible implementation, the first compensation data is determined based on a reference image, and the reference image is used to describe the display effect of the display panel on an image of a reference gray level.

[0008] In a possible implementation, the determination module is further configured to: obtain a first reference compensation data of the target area, where the first reference compensation data is determined based on a reference image, and the reference image is used to describe the display effect of the display panel on the second image; obtain a second reference compensation data of the target area, where the second reference compensation data is the difference between third historical digital gamma data and fourth historical digital gamma data when the second image was historically displayed in the target area, the third historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with the reference area of the display panel as the center, and the fourth historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with the target area as the center; and calibrate the first reference compensation data based on the second reference compensation data to obtain the first compensation data.

[0009] In a possible implementation, the target compensation gain includes a first red component gain, a first green component gain, and a first blue component gain, and the first display data includes first red component data, first green component data, and first blue component data; a calculation module is configured to: calculate second red component data in the second display data based on the first red component gain and the first red component data; calculate second green component data in the second display data based on the first green component gain and the first green component data; and calculate second blue component data in the second display data based on the first blue component gain and the first blue component data.

[0010] On the other hand, a display compensation method is provided. The method is applied to a display driving chip and includes: obtaining first display data of a target area of the display panel when displaying a first image at a target gray level, where the target gray level is lower than a reference gray level; determining a target compensation gain of the target area when displaying the first image based on the first display data and compensation mapping information, where the compensation mapping information indicates a correspondence between first compensation data and the target compensation gain, the first compensation data is compensation data of the target area when displaying a second image at the reference gray level, and the compensation mapping information is determined based on digital gamma data of the target area when displaying the first image and the second image; adjusting the first display data based on the target compensation gain to obtain second display data, and the second display data is used for the target area to display the first image.

[0011] In a possible implementation manner, the method further includes: obtaining second compensation data of the target area when displaying the first image; determining the compensation mapping information based on the first compensation data and the second compensation data, and the target compensation gain is a ratio between the second compensation data and the first compensation data.

[0012] In a possible implementation manner, the obtaining the second compensation data of the target area when displaying the first image includes: obtaining first historical digital gamma data of the target area when historically displaying the first image, where the first historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with a reference area of the display panel as the center; obtaining second historical digital gamma data of the target area when historically displaying the first image, where the second historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with the target area as the center; and taking the difference between the second historical digital gamma data and the first historical digital gamma data to obtain the second compensation data.

[0013] In a possible implementation manner, the first compensation data is determined based on a reference image, and the reference image is used to describe the display effect of the display panel on the second image.

[0014] In a possible implementation, obtaining first compensation data for a target region when displaying a second image includes: obtaining first reference compensation data for the target region, where the first reference compensation data is determined based on a reference image, and the reference image is used to describe the display effect of the display panel on the second image; obtaining second reference compensation data for the target region, where the second reference compensation data is the difference between a third historical digital gamma data and a fourth historical digital gamma data of the target region when historically displaying the second image, the third historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with a reference region of the display panel as the center, and the fourth historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with the target region as the center; calibrating the first reference compensation data based on the second reference compensation data to obtain the first compensation data.

[0015] In a possible implementation, a target compensation gain includes a first red component gain, a first green component gain, and a first blue component gain, and first display data includes first red component data, first green component data, and first blue component data; adjusting the first display data based on the target compensation gain to obtain second display data includes: calculating second red component data in the second display data based on the first red component gain and the first red component data; calculating second green component data in the second display data based on the first green component gain and the first green component data; calculating second blue component data in the second display data based on the first blue component gain and the first blue component data.

[0016] On the other hand, a display device is provided, and the display device includes a display driving chip in any of the above possible implementations.

[0017] The technical solutions provided in this application at least bring the following beneficial effects:

[0018] This application reflects the true gamma situation of the target region when displaying the first image with too low gray levels through compensation mapping information, and adjusts to obtain accurate second display data based on the first display data of the target region and the compensation gain indicated by the compensation mapping information, improving the accuracy of the displayed image and further improving the image display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram showing the relationship between gray levels and compensation values provided by the related art;

[0021] Figure 2 It is a schematic diagram of the structure of a display driving chip provided by an embodiment of the present application;

[0022] Figure 3 It is a display schematic diagram of a display panel provided by an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram showing the relationship between gray levels and digital gamma data provided by an embodiment of the present application;

[0024] Figure 5 It is a relationship diagram between first compensation data and second compensation data provided by an embodiment of the present application;

[0025] Figure 6 It is a schematic diagram showing the relationship between first compensation data and a target compensation gain provided by an embodiment of the present application;

[0026] Figure 7 It is a schematic diagram of a look-up table provided by an embodiment of the present application;

[0027] Figure 8 It is a schematic diagram showing the corresponding relationship between gray levels and different color components of digital gamma data provided by an embodiment of the present application;

[0028] Figure 9 It is a schematic diagram of a look-up table corresponding to a color component provided by an embodiment of the present application;

[0029] Figure 10 It is a schematic diagram of the process of determining target compensation data corresponding to different color components provided by an embodiment of the present application;

[0030] Figure 11 It is a schematic diagram of the flow of display compensation provided by an embodiment of the present application;

[0031] Figure 12 It is a schematic diagram of the flow of a display compensation method provided by an embodiment of the present application. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0033] A display panel is an electronic component in a display device used to display images. The smallest unit for the display panel to display an image is a pixel. The display device controls the states of each pixel on the display panel so that the display panel can display various images. For example, in a Liquid Crystal Display (LCD), the pixels in the display panel are composed of liquid crystal molecules and corresponding electrodes. When different voltages are applied to the electrodes, the orientation of the liquid crystal molecules changes, the arrangement of the liquid crystal molecules changes, and the liquid crystal molecules modulate the light from the backlight source, controlling the transmission and blocking of light, so that the pixels display different colors or different brightness levels.

[0034] Ideally, the characteristics of each part of the entire display panel should be consistent to achieve accurate control of the display panel and accurate display of images. For example, the display panel also includes Thin Film Transistors (TFTs), and the TFTs are connected to the electrodes. When no gate voltage is applied to the TFT, the current in the semiconductor layer cannot pass through; when a certain voltage is applied to the gate of the TFT, an electric field is generated, enabling the current in the semiconductor layer of the TFT to flow. Whether the current flows and its magnitude will affect the conductivity between the source and drain of the TFT, thereby controlling whether the TFT applies a voltage to the electrode and the magnitude of the applied voltage.

[0035] If the characteristics of each TFT in the display panel are consistent, the display can accurately control each pixel in the display panel through the control of the TFTs, thereby achieving accurate display of images. However, due to process and manufacturing limitations, different TFTs in the display panel may have differences in characteristics such as threshold voltage and mobility. Among them, the threshold voltage of a TFT refers to the threshold of the gate voltage required to turn on the TFT. When the gate voltage applied to the TFT exceeds the threshold voltage of the TFT, the TFT conducts, allowing current to flow between the source and drain, and the TFT applies a voltage to the electrode; conversely, when the gate voltage applied to the TFT is lower than the threshold voltage, the TFT is in the off state, and almost no current passes between the source and drain of the TFT, and the TFT does not apply a voltage to the electrode.

[0036] If the threshold voltages of the TFTs at different positions on the display panel are different, then when displaying an image of the same gray level, the same gate voltage is applied to the TFTs corresponding to each position on the display panel. However, due to the different threshold voltages of the TFTs at different positions, some TFTs at some positions on the display panel may conduct, and some TFTs may not conduct, resulting in different chromaticity and brightness levels displayed by the pixels controlled by the TFTs at different positions, making the picture display uneven and showing the mura (non-uniformity) phenomenon.

[0037] Among them, the mobility of the TFT refers to the moving speed of carriers between the source and drain of the TFT under the action of an electric field. The mobility of the TFT affects the current output ability and response speed of the TFT. The greater the mobility of the TFT, the faster the moving speed of the carriers, so that the TFT can output a larger current when the same voltage is applied, or reach a stable current state in a shorter time.

[0038] When a grayscale image is displayed, the grayscale voltages corresponding to different grayscales are different. When the TFT is turned on, the pixel is driven to emit light or the deflection angle of the liquid crystal molecules is controlled through the grayscale voltage to adjust the brightness and chromaticity. If there are differences in the mobilities of the TFTs at different positions of the display panel, then at the same grayscale voltage, when the mobility of the TFT is high, the carriers move fast in the semiconductor layer, and the pixel controlled by the TFT with high mobility can obtain a larger driving current, so that the brightness of this pixel is higher; while the pixel controlled by the TFT with low mobility obtains a smaller current and the brightness is lower, which leads to inconsistent brightness at different positions of the image. That is to say, the mura phenomenon will also occur when the mobilities of the TFTs in the display panel are different.

[0039] In the field of display technology, compensation is usually carried out for the mura phenomenon to make the display panel maintain the uniformity of brightness and chromaticity when displaying a grayscale image. For example, in the related technology, when the display panel displays an image with medium and low grayscales (the grayscale is lower than a certain value), the image displayed on the display panel is photographed to complete the acquisition of mura data. Then, according to the collected data, the compensation (offset) data is calculated, and the pixel voltage when displaying the image with medium and low grayscales is adjusted according to the compensation data to achieve the accurate display of the image with medium and low grayscales.

[0040] However, due to the performance limitations of the camera, the generation and capture efficiency of photons by the camera's image sensor will decrease in low-light environments. Therefore, when the camera takes pictures of images with low gray levels displayed on the display panel, it may not be able to distinguish signals from noise, and the exposure time is long, resulting in a large amount of noise components in the collected data, making it difficult to obtain accurate mura data. Therefore, related technologies will predict compensation data at low gray levels based on mura data at medium and low gray levels. However, since the relationship between the brightness of the image and the compensation data is usually not a simple linear relationship, at high gray levels, the relationship between the brightness of the image and the compensation data may be relatively stable, but at low gray levels, the relationship between the brightness of the image and the compensation data may change. For example, at low gray levels, the response characteristics of liquid crystal molecules may change non-linearly, making the compensation data at low gray levels linearly predicted based on mura data at medium and low gray levels unable to well match the actual mura situation at low gray levels. That is to say, the compensation data predicted by related technologies is difficult to accurately reflect the actual compensation situation, so the compensation effect at low gray levels is not ideal.

[0041] For example, refer to Figure 1 , which shows a schematic diagram of the relationship between gray levels and compensation values provided by related technologies. The horizontal axis in the figure is the gray level, including gray levels from 0 to 255, such as gray levels 8, 132, 64, 192, 224, and 255. Different gray levels are divided into different gray scales. For example, gray levels from 0 to 32 belong to the low (LW) gray scale, gray level 64 belongs to the middle (MD) gray scale, gray levels from 33 to 63 belong to the medium-low gray scale, gray levels from 65 to 191 belong to the medium-high gray scale, and gray levels from 192 to 255 belong to the high (HG) gray scale. The vertical axis in the figure is the change value (delta), that is, the compensation value.

[0042] Taking the photographing gray levels of 32, 64, and 192 in the demura (de-mura) process as examples, pictures are taken at these three gray levels respectively, and the mura data of the images displayed on the display panel are collected. The compensation values at the three gray levels of 32, 64, and 192 are obtained through the demura algorithm. For low gray levels below gray level 32 and high gray levels above gray level 192, the compensation values corresponding to each gray level at low and high gray levels are obtained by prediction. From Figure 1 it can be seen that the compensation values corresponding to each gray level at low and high gray levels are obtained by linear prediction. The predicted compensation values are difficult to accurately reflect the actual compensation situation, and the compensation effect at low gray levels is not ideal, with deviations in brightness and chromaticity.

[0043] An embodiment of the present application provides a display driving chip, which can improve the accuracy of the determined compensation data and the image display quality after compensation. The display driving chip can be a chip including a timing controller (TCON), or can also be a chip including both TCON and at least one of a source driver or a gate driver. Refer to Figure 2 , which shows a schematic structural diagram of a display driving chip provided by an embodiment of the present application. Figure 2 The structure shown inside the display driving chip can be deployed inside the TCON. The display driving chip includes: an acquisition module 201, configured to acquire first display data of a target area of the display panel when displaying a first image at a target gray level, where the target gray level is lower than a reference gray level; a determination module 202, configured to determine a target compensation gain of the target area when displaying the first image at the target gray level based on the first display data and compensation mapping information, where the compensation mapping information indicates the correspondence between first compensation data and the target compensation gain, the first compensation data is the compensation data of the target area when displaying a second image at the reference gray level, and the compensation mapping information is determined based on digital gamma data of the target area when displaying the first image and the second image; a calculation module 203, configured to adjust the first display data based on the target compensation gain to obtain second display data, and the second display data is used for the target area to display the first image.

[0044] Among them, the target area can be any area including abnormal pixels in the display panel, and an abnormal pixel refers to a pixel with characteristics different from those of most pixels in the display panel. For example, when displaying a picture at the same gray level, the brightness displayed by most pixels in the display panel is brightness 1, while the brightness displayed by pixel a is brightness 2, then pixel a is an abnormal pixel, and the target area can include pixel a. The number of pixels included in the target area is not limited in the embodiment of the present application.

[0045] The reference gray level refers to the gray level at which compensation data can be accurately determined by taking a picture, and can also be called the lowest picture-taking gray level or the lowest picture-taking gray scale. For example, when the gray level is 32, accurate compensation data can be determined by the above-mentioned picture-taking method, and when the gray level is less than 32, there are obvious errors in the compensation data determined by the picture-taking method, or it is difficult to determine the compensation data by the picture-taking method, then 32 is the lowest picture-taking gray level, that is, the reference gray level.

[0046] The target gray level is any gray level lower than the reference gray level. The first display data includes data such as red green blue (RGB) data, gray value, or digital gamma data when the target area displays the first image with the target gray level. The digital gamma data can also be referred to as gamma correction data or gamma correction value. The embodiments of the present application do not limit the manner of obtaining the first display data. Taking the first display data including the RGB data of the target area as an example, the obtaining module 201 can receive video signals from the main board connected to the display chip or other video sources. These video signals contain the RGB data of the image and other control signals such as synchronization signals and enable signals. The obtaining module 201 analyzes the received video signals, separating the RGB data and related control information. Optionally, during the analysis process, the obtaining module 201 can perform some signal processing such as decoding, denoising, and format conversion. Then, the obtaining module 201 determines the pixel data of each frame of the image according to the synchronization signal and control information in the video signal, parses the continuous video data stream into the RGB data of each pixel according to a certain timing and rule, and determines the RGB data corresponding to each pixel according to the specifications of the display panel, so as to obtain the RGB data of each pixel in the target area and realize the acquisition of the first display data. Or, the obtaining module 201 can also realize the acquisition of the first display data by receiving the first display data sent by the image processor connected to the display driver chip.

[0047] Taking the first display data including the gray value corresponding to each pixel as an example, a gray value lookup table can be pre-stored inside the display driver chip. The gray level lookup table is generated according to the characteristics and requirements of the display panel during the production calibration process, and records the gray values corresponding to different RGB data. When the obtaining module 201 receives the RGB data, the obtaining module 201 will look up the corresponding gray value in the gray level lookup table to realize the acquisition of the first display data.

[0048] Or, taking the first display data including digital gamma data as an example, the obtaining module 201 determines the digital gamma data corresponding to the RGB data of each pixel in the target area according to the received RGB data and the preset digital gamma data, and realizes the acquisition of the first display data.

[0049] After the obtaining module 201 obtains the first display data, it can transmit the first display data to the determining module 202, or send a signal indicating that the first display data has been obtained to the determining module 202, so that the determining module 202 reads the first display data obtained by the obtaining module 201. Then, the determining module 202 determines the target compensation gain when the target area displays the first image with the target gray level based on the first display data and the compensation mapping information.

[0050] Among them, the compensation mapping information indicates the correspondence between the first compensation data and the target compensation gain. The compensation mapping information is the compensation data of the target area when displaying the second image of the reference gray level, and the compensation mapping information is determined based on the digital gamma data of the target area when displaying the first image and the second image.

[0051] Regarding the manner in which the determination module 202 obtains the compensation mapping information before determining the target compensation gain based on the first display data and the compensation mapping information, the embodiments of the present application do not make any limitations. Exemplarily, the determination module 202 may obtain the second compensation data of the target area when displaying the first image; determine the compensation mapping information based on the first compensation data and the second compensation data, and the target compensation gain is the ratio between the second compensation data and the first compensation data.

[0052] Among them, the first compensation data is the compensation data of the target area when displaying the second image of the reference gray level, that is, the first compensation data is the difference between the digital gamma data of the target area when displaying the second image and the digital gamma data of the reference area when displaying the second image.

[0053] Optionally, the reference area is an area without mura phenomenon or with a less severe mura phenomenon. For example, referring to Figure 3 the display schematic diagram of the display panel shown, when displaying images of the same gray level, the display brightness and chromaticity of most areas of the display panel are consistent. For example, the display brightness and chromaticity of area C and area X are consistent, so area C and area X can be used as reference areas. However, the display brightness and chromaticity of area A and area B are significantly inconsistent with those of most areas of the display panel, so area A and area B cannot be used as reference areas.

[0054] Exemplarily, there are multiple ways to obtain the first compensation data. Here, taking Method 1 to Method 3 as examples, the ways to obtain the first compensation data will be described exemplarily.

[0055] Method 1: The first compensation data is determined based on a reference image, and the reference image is used to describe the display effect of the display panel on the second image.

[0056] When the second image is displayed full-screen on the display panel, that is, when each pixel on the display panel displays the brightness corresponding to the reference gray level, the display panel is photographed to obtain a reference image. Then, the gray values of each pixel reflected by the reference image are detected pixel by pixel, and the gray values of each pixel in the target area are converted into the detected brightness values of each pixel. According to the specifications and design requirements of the display panel, the target brightness value of each pixel in the target area is determined when the gray level is the reference gray level. The target brightness value is usually the brightness that the display panel should present under the reference gray level in an ideal situation. The target brightness value can be obtained by theoretical calculation, experimental measurement, or referring to the brightness data of a standard display panel, etc.

[0057] Compare the detected brightness value of each pixel in the target area with the target brightness value, and calculate the brightness difference. According to the brightness difference, the difference in the digital gamma data corresponding to the brightness difference can be further calculated, so as to obtain the first compensation data. The first compensation data can be calculated by the determination module 202, or can be calculated by other devices connected to the driving display chip and then sent to the determination module 202.

[0058] The compensation algorithm for calculating the first compensation data based on the brightness difference can be a linear compensation algorithm, a non-linear compensation algorithm, a model-based compensation algorithm, etc. If the detected brightness value of the target area is higher than the target brightness value, the first compensation data is negative data, and vice versa.

[0059] For example, see Figure 3 , taking the reference gray level as 32 as an example, Figure 3 the display brightness of each pixel in Figure 3 is the display brightness corresponding to 32 gray levels. It can be seen from Figure 3 that when displaying images based on the same gray level, the display brightness of different areas of the displayed image is inconsistent. For example, the display brightness of area A is too low, and the display brightness of area B is too high, which is the occurrence of the mura phenomenon. Since the display brightness of most areas in the image is the same as that of area C, area C is determined as the reference area, and the display brightness of area C is determined as the target display brightness.

[0060] Perform brightness detection on area A, area B, and area C to obtain the detected brightness value of area A, the detected brightness value of area B, and the detected brightness value of area C. Subtract the detected brightness value of area A from the detected brightness value of area C to obtain the brightness difference of area A, and subtract the detected brightness value of area B from the detected brightness value of area C to obtain the brightness difference of area B.

[0061] Perform gamma tuning on the brightness difference of region A, or in other words, perform gamma correction on the brightness difference of region A to obtain the compensation data offset_A for region A, where offset_A is positive compensation data. Perform gamma correction on the brightness difference of region B to obtain the compensation data offset_B for region B, where offset_B is negative compensation data. If the target region is region A, the compensation data offset_A for region A is the first compensation data; if the target region is region B, the compensation data offset_B for region B is the first compensation data.

[0062] Method 2: Obtain the third historical digital gamma data and the fourth historical digital gamma data when the second image was historically displayed in the target region; subtract the fourth historical digital gamma voltage data from the third historical digital gamma data to obtain the first compensation data.

[0063] Among them, the third historical digital gamma data is obtained by performing gamma adjustment calculation on an image of the reference gray level with the reference region of the display panel as the center, and the fourth historical digital gamma data is obtained by performing gamma adjustment calculation on an image of the reference gray level with the target region as the center.

[0064] The relationship between the gray level of a pixel, the brightness, and the digital gamma data of a single one satisfies the following formula (1).

[0065] Gary gamma =L (1)

[0066] Gray in formula (1) is the gray level of the pixel, gamma is the digital gamma data, and L is the brightness. When displaying an image of the reference gray level, substituting the reference gray level and the brightness displayed by the pixels in the reference region into formula (1) can obtain the third historical digital gamma data calculated by performing gamma adjustment with the reference region as the center; substituting the reference gray level and the brightness displayed by the pixels in the target region into formula (1) can obtain the fourth historical digital gamma data calculated by performing gamma adjustment with the target region as the center. Subtracting the fourth historical digital gamma data from the third historical digital gamma data can obtain the first compensation data, and the first compensation data can be positive data or negative data.

[0067] Method 3: Obtain the first reference compensation data, which is determined based on a reference image used to describe the display effect of the display panel for an image of the reference gray level; obtain the second reference compensation data for the target region, which is the difference between the third historical digital gamma data and the fourth historical digital gamma data when the target region historically displayed the reference gray level; calibrate the first reference compensation data based on the second reference compensation data to obtain the first compensation data.

[0068] Among them, the first reference compensation data may be the first compensation data obtained based on Method 1, and the second reference compensation data may be the first compensation data obtained based on Method 2. The processes of obtaining the first reference compensation data and the second reference compensation data will not be elaborated here.

[0069] Theoretically, the first reference compensation data and the second reference compensation data should be equal. However, since errors may occur in the process of determining the first compensation data through different methods, the first reference compensation data and the second reference compensation data can be calibrated to obtain more accurate reference compensation data. Since usually the first reference compensation data obtained through Method 1 is more in line with the human eye's acquisition effect of the image, the first reference compensation data can be used as a benchmark, and calibrated based on the second reference compensation data to adjust the first reference compensation data to obtain more accurate first compensation data.

[0070] For example, if the difference between the first reference compensation data and the second reference compensation data is less than or equal to the difference threshold, it means that the difference between the reference compensation data obtained through two different methods is not significant, so the first reference compensation data can be directly used as the final first compensation data. If the difference between the first reference compensation data and the second reference compensation data is greater than the difference threshold, it means that the difference between the reference compensation data obtained through two different methods is relatively large, and the average value of the first reference compensation data and the second reference compensation data can be used as the final first compensation data.

[0071] Or, if both the first reference compensation data and the second reference compensation data include the first compensation data corresponding to multiple pixels in the target area, the difference between the first compensation data corresponding to each pixel can be determined respectively, and the reference compensation data corresponding to the pixels in the first reference compensation data with a difference greater than the difference threshold can be adjusted to obtain the final first compensation data including the adjusted compensation data of multiple pixels.

[0072] In addition, the embodiments of the present application do not limit the method for the determination module 202 to obtain the second compensation data. Exemplarily, the determination module 202 may obtain the first historical digital gamma data when the target area historically displays an image of the target gray level, and the first historical digital gamma data is obtained by performing gamma adjustment calculation on the image of the target gray level with the reference area of the display panel as the center; obtain the second historical digital gamma data when the target area historically displays an image of the target gray level, and the second historical digital gamma data is obtained by performing gamma adjustment calculation on the image of the target gray level with the target area as the center; subtract the second historical digital gamma data from the first historical digital gamma data to obtain the second compensation data.

[0073] For example, the determination module 202 substitutes the brightness and the target gray level when the target area historically displays an image with the target gray level into the above formula (1) to obtain the second historical digital gamma data when the target area historically displays an image with the target gray level; substitutes the brightness and the target gray level when the reference area historically displays an image with the target gray level into the above formula (1) to obtain the first historical digital gamma data when the reference area historically displays an image with the target gray level.

[0074] Among them, the brightness when the target area historically displays an image with the target gray level and the brightness when the reference area historically displays an image with the target gray level can be detected by other devices and transmitted to the determination module 202. The first historical digital gamma data when the reference area historically displays an image with the target gray level can also be a set default value. Therefore, the determination module 202 can obtain the first historical digital gamma data by reading the first historical digital gamma data stored in the driving display chip.

[0075] Since the accuracy of the image displayed in the reference area is relatively high, the accuracy of the first historical digital gamma data used to control the image display in the reference area is relatively high. Then, the first historical digital gamma data can be used as a reference to determine the difference between the second historical digital gamma data used to control the image display in the target area and the first historical digital gamma data. This difference can reflect the difference between the first historical digital gamma data and the second historical digital gamma data, thereby reflecting the compensation requirement for the target area. That is, the second compensation data obtained by taking the difference can reflect the compensation requirement for the target area when displaying an image with the target gray level.

[0076] Exemplarily, referring to Figure 4 shows a schematic diagram of the relationship between the gray level and the digital gamma data provided by an embodiment of the present application. Figure 4 The horizontal axis of is the gray level, including each gray level from 0 to 32, and the vertical axis is the value of the digital gamma data. Different curves represent the relationship between the gray level and the digital gamma data in different regions. For example, the curve corresponding to A reflects the digital gamma data of area A in the display panel when the gray level of the displayed image is different gray levels. The center C represents that area C is the central area of the display panel, and the curve corresponding to the center C reflects the digital gamma data of area C when the gray level of the displayed image is different gray levels. The curve corresponding to B reflects the digital gamma data of area B in the display panel when the gray level of the displayed image is different gray levels.

[0077] Taking the target gray level as 16, the target area as area A, and the reference area as area C as an example, when the image with a gray level of 16 is displayed on the display panel, the digital gamma data of area A is the second historical digital gamma data, the digital gamma data of area C is the first historical digital gamma data, and the difference between the second historical digital gamma data and the first historical digital gamma data is the second compensation data Gamma_offset A of area A. Correspondingly, if the target area is area B, when the image with a gray level of 16 is displayed on the display panel, the digital gamma data of area B is the second historical digital gamma data, the digital gamma data of area C is the first historical digital gamma data, and the difference between the second historical digital gamma data and the first historical digital gamma data is the second compensation data Gamma_offset B of area B.

[0078] After obtaining the first compensation data and the second compensation data, the compensation mapping information can be determined. In the process of generating the compensation mapping information, first, the target compensation gain between the first compensation data and the second compensation data can be determined, and the target compensation gain is the ratio of the second compensation data to the first compensation data.

[0079] Taking the target area as area A as an example, the target compensation gain gain A is Gamma_offset A / offset A. Where Gamma_offset A is the second compensation data of area A and offset A is the first compensation data of area A. Taking the target area as area B as an example, the target compensation gain gain B is Gamma_offset B / offset B. Where Gamma_offset B is the second compensation data of area B and offset B is the first compensation data of area B.

[0080] In addition to the target area, the first compensation data of the pixel points in other areas at the reference gray level and the second compensation data at the target gray level can also be determined in a similar way, so as to form the compensation mapping information corresponding to the target gray level.

[0081] Exemplarily, the relationship between the first compensation data and the second compensation data can be constructed based on the first compensation data and the second compensation data corresponding to the pixel points in multiple areas as shown in Figure 5 the relationship diagram between the first compensation data and the second compensation data. Figure 5 In the horizontal axis offset represents different first compensation data, the vertical axis Gmma_offset represents different second compensation data, and any point on the curve is the target compensation gain gain between a corresponding set of first compensation data and second compensation data.

[0082] For Figure 5Perform deformation to obtain the correspondence between different target compensation gains and different first compensation data, as Figure 6 shown. Figure 6 In [Figure 1], the horizontal axis represents different first compensation data offsets, and the vertical axis represents the target compensation gains corresponding to the first compensation data. Similarly, based on the above process, the correspondence between the target compensation gains corresponding to multiple gray levels lower than the reference gray level and different first compensation data can also be obtained and organized into a lookup table (Lookup Table, LUT) as Figure 7 shown. This lookup table includes compensation mapping information.

[0083] Figure 7 In [Figure 2], the horizontal axis represents different first compensation data offsets, and the vertical axis represents the digital gamma data corresponding to different gray levels. Different points in the two-dimensional image correspond to different target compensation gains. For example, Figure 7 in [Figure 2], point f represents a target compensation gain. The abscissa of point f is the first compensation data offset corresponding to this target compensation gain, and the ordinate of point f is the digital gamma data corresponding to this target compensation gain.

[0084] The process of obtaining the compensation mapping information described above can occur before the acquisition module 201 acquires the first display data or after the acquisition module 201 acquires the first display data. After the determination module 202 acquires the compensation mapping information and the first display data, it determines the target compensation gain when the target area displays an image with the target gray level.

[0085] Based on the above description, it can be known that a set of first compensation data and digital gamma data in the compensation mapping information corresponds to a unique target compensation gain. Therefore, before determining the target compensation gain based on the first display data and the compensation mapping information, the determination module 202 determines the first compensation data and digital gamma data corresponding to the first display data based on the first display data.

[0086] Among them, the first compensation data can be determined in the manner described above and stored in the memory corresponding to the determination module 202. The determination module 202 realizes the acquisition of the first compensation data by reading the first compensation data corresponding to the first display data. The memory corresponding to the determination module 202 can be the internal memory of the determination module 202 or the memory connected to the determination module 202.

[0087] The manner in which the determination module 202 determines the digital gamma data corresponding to the first display data is related to the content of the first display data. For example, if the first display data includes the digital gamma data of the target area when displaying an image at the target gray level, the digital gamma data included in the first display data can be directly used as the digital gamma data for determining the target compensation gain. If the first display data does not include the digital gamma data of the target area when displaying an image at the target gray level, and the first display data includes the RGB data of each pixel in the target area, the determination module 202 reads the digital gamma data corresponding to the RGB data of each pixel in the target area stored in the memory corresponding to the determination module 202, and uses the digital gamma data of the target area as the digital gamma data for determining the target compensation gain.

[0088] Then, the calculation module 203 can adjust the first display data based on the target compensation gain to obtain the second display data, which is used to display an image at the target gray level in the target area. For example, if the first display data includes the digital gamma data for displaying an image at the target gray level in the target area, the digital gamma data is multiplied by the target compensation gain to obtain the adjusted digital gamma data, and the adjusted digital gamma data is the second display data. In this case, the target compensation gain can compensate for the display brightness of the target area.

[0089] In a possible implementation, the target compensation gain can also be used for chromaticity compensation. When the target compensation gain is used for chromaticity compensation, the target compensation gain can include a red component gain, a green component gain, and a blue component gain. Among them, the red component gain is used to compensate the red component pixel data of the RGB data, the green component gain is used to compensate the green component pixel data of the RGB data, and the blue component gain is used to compensate the blue component pixel data of the RGB. If the target compensation gain includes component gains corresponding to different color components, both the first compensation data and the second compensation data involved in the process of generating the compensation mapping information include component compensation data corresponding to different color components.

[0090] Exemplarily, the digital gamma data of different regions can be calculated to obtain the red component of the digital gamma data, the green component of the digital gamma data, and the blue component of the digital gamma data. Among them, the manner of calculating different color components of the digital gamma data can be determined based on the weights of pixel data of different color components in the RGB data. For example, according to the weights of different color components, Figure 4 the relationship between the gray levels of the shown regions and the digital gamma data is split to obtain Figure 8 the corresponding relationship between the gray levels of the shown regions and different color components of the digital gamma data. Figure 8The Gamma_offsetA red component represents the difference between the digital gamma data red component of region A when displaying an image of a certain gray level and the digital gamma data red component of the central C region when displaying the image of the same gray level. The Gamma_offsetB red component represents the difference between the digital gamma data red component of region B when displaying an image of a certain gray level and the digital gamma data red component of the central C region when displaying the image of the same gray level. The Gamma_offsetA green component represents the difference between the digital gamma data green component of region A when displaying an image of a certain gray level and the digital gamma data green component of the central C region when displaying the image of the same gray level. The Gamma_offsetB green component represents the difference between the digital gamma data green component of region B when displaying an image of a certain gray level and the digital gamma data green component of the central C region when displaying the image of the same gray level. The Gamma_offsetA blue component represents the difference between the digital gamma data blue component of region A when displaying an image of a certain gray level and the digital gamma data blue component of the central C region when displaying the image of the same gray level. The Gamma_offsetB blue component represents the difference between the digital gamma data blue component of region B when displaying an image of a certain gray level and the digital gamma data blue component of the central C region when displaying the image of the same gray level.

[0091] Similarly, in the way described in the previous text, the second compensation data corresponding to different color components can be determined, so as to determine the relationship between the different color components in the second compensation data corresponding to the pixel points in multiple regions and the different color components in the first compensation data. Thus, the compensation gain gain between the first compensation data and the second compensation data corresponding to the same color component is determined, and then the corresponding relationship between the reference compensation data and the compensation gain corresponding to the same color component is obtained, and they are respectively organized into look-up tables corresponding to different color components. As Figure 9 shown, one color component corresponds to one look-up table, and one look-up table is the sub-mapping information corresponding to one color component in the compensation mapping information.

[0092] Figure 9 In the look-up table corresponding to the red component in , a set of first compensation data offset corresponding to the red component and the digital gamma data red component correspond to a unique compensation gain gain red component. Figure 9 In the look-up table corresponding to the green component in , a set of first compensation data offset corresponding to the green component and the digital gamma data green component correspond to a unique compensation gain gain green component. Figure 9In the lookup table corresponding to the blue component, a first compensation data offset corresponding to a set of blue components and digital gamma data blue components correspond to a unique compensation gain blue component.

[0093] During the chromaticity compensation process, the red compensation gain, green compensation gain, and blue compensation gain corresponding to the first red component data, first green component data, and first blue component data in the first display data can be determined respectively, and then the target compensation data corresponding to the red component, green component, and blue component can be determined respectively to compensate the first red component data, first green component data, and first blue component data in the first data.

[0094] See Figure 10 The process of determining the target compensation data corresponding to different color components shown Figure 10 In the figure, a two-dimensional (2D) compensation gain lookup table (2D_gain_LUT) is used as an example for the lookup table. During the process of determining the second display data, first, the first display data and the first compensation data need to be obtained. The first display data includes the RGB data or digital gamma data of the first region, and the first compensation data can be obtained by reading the data stored in the SRAM (Static Random Access Memory) corresponding to the determination module 202. Based on the first red component data in the obtained first display data and the first compensation data, look up the red component gain in the lookup table corresponding to the red component. Based on the first green component data and the first compensation data, look up the green component gain in the lookup table corresponding to the green component. Based on the first blue component data and the first compensation data, look up the blue component gain in the lookup table corresponding to the blue component.

[0095] Then, the first compensation data can be multiplied by the red component gain to obtain the target compensation data corresponding to the red component, multiplied by the green component gain to obtain the target compensation data corresponding to the green component, and multiplied by the blue component gain to obtain the target compensation data corresponding to the blue component.

[0096] See Figure 11 , which shows a schematic flowchart of a display compensation shown in an embodiment of the present application. Taking the lowest photographing gray level as 32 as an example, in the 0 - 32 gray level range, gamma adjustment calculations are respectively performed with Figure 3 the A region in the figure as the center, the B region as the center, the C region as the center, and the X region as the center to obtain the digital gamma data of the A, B, C, and X regions in the 0 - 32 gray level range. And perform Figure 4For the calculations shown in the relevant processes, the second compensation data for several typical regions A, B, and X at gray levels 0 - 31 are obtained respectively. For example, taking region A as an example, the digital gamma data a1 obtained by performing gamma adjustment calculation with region A as the center at gray level 16, the digital gamma data a2 obtained by performing gamma adjustment calculation with region C (reference region) as the center at gray level 16 are calculated, and the difference between a1 and a2 is calculated to obtain the second compensation data of region A at gray level 16.

[0097] Figure 11 The offset(A - C) in it represents the second compensation data of region A, offset(B - C) represents the second compensation data of region B, and offset(B - C) represents the second compensation data of region A. Then, the first compensation data of regions A, B, and X at the reference gray level stored in the SRAM are read. According to the conversion method as Figures 8 to 9 shown, the compensation gain lookup tables corresponding to the red component (R 2D_gain_LUT), the green component (G 2D_gain_LUT), and the blue component (B 2D_gain_LUT) are obtained respectively.

[0098] During the process of performing chromaticity compensation on a certain region at a certain gray level, according to the process as Figure 10 shown, the target compensation data corresponding to the red component, the target compensation data corresponding to the green component, and the target compensation data corresponding to the blue component of the region at the gray level are obtained. Then, based on the obtained target compensation data of different color components, the input digital gamma data is compensated to obtain the data finally used for image display at the gray level.

[0099] Taking the first region at the first gray level as an example, after obtaining the target compensation data corresponding to the red component data, the target compensation data corresponding to the green component, and the target compensation data corresponding to the blue component according to the process as Figure 10 shown, the first red component data is added to the target compensation data corresponding to the red component to obtain the second red component data, the first green component data is added to the target compensation data corresponding to the green component to obtain the second green component data, and the first blue component data is added to the target compensation data corresponding to the blue component to obtain the second blue component data.

[0100] In summary, based on the gamma voltage data of each region when displaying images at too low gray levels and the reference gray level, this application constructs compensation mapping information to reflect the true gamma situation of each region when displaying images at too low gray levels, and adjusts to obtain accurate second display data based on the display data of the target region and the compensation gain indicated by the compensation mapping information, improving the accuracy of the displayed image, and thus enhancing the image display quality.

[0101] In an exemplary embodiment, a display compensation method is provided, which is applied to a display driving chip for controlling a display panel to perform image display. As Figure 12 shown, the method includes but is not limited to S1201 to S1203 as follows.

[0102] S1201, obtaining first display data of a target area of the display panel when displaying a first image at a target gray level, where the target gray level is lower than a reference gray level.

[0103] S1202, determining a target compensation gain of the target area when displaying the first image based on the first display data and compensation mapping information, where the compensation mapping information indicates a correspondence between first compensation data and the target compensation gain, the first compensation data is compensation data of the target area when displaying a second image at the reference gray level, and the compensation mapping information is determined based on digital gamma data of the target area when displaying the first image and the second image.

[0104] In a possible implementation manner, the method further includes: obtaining second compensation data of the target area when displaying the first image; determining the compensation mapping information based on the first compensation data and the second compensation data, and the target compensation gain is a ratio of the second compensation data to the first compensation data.

[0105] Exemplarily, obtaining the second compensation data of the target area when displaying the first image includes: obtaining first historical digital gamma data of the target area when historically displaying the first image, where the first historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with a reference area of the display panel as the center; obtaining second historical digital gamma data of the target area when historically displaying the first image, where the second historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with the target area as the center; and taking a difference between the second historical digital gamma data and the first historical digital gamma data to obtain the second compensation data.

[0106] Optionally, the first compensation data is determined based on a reference image, and the reference image is used to describe the display effect of the display panel on the second image.

[0107] Alternatively, obtaining first compensation data for a target region when displaying a second image includes: obtaining first reference compensation data for the target region, where the first reference compensation data is determined based on a reference image for describing the display effect of the display panel on the second image; obtaining second reference compensation data for the target region, where the second reference compensation data is the difference between a third historical digital gamma data and a fourth historical digital gamma data of the target region when historically displaying the second image, the third historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with a reference region of the display panel as the center, and the fourth historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with the target region as the center; calibrating the first reference compensation data based on the second reference compensation data to obtain the first compensation data.

[0108] S1203. Adjust the first display data based on the target compensation gain to obtain second display data for displaying the first image in the target region.

[0109] In a possible implementation, the target compensation gain includes a first red component gain, a first green component gain, and a first blue component gain, and the first display data includes a first red component data, a first green component data, and a first blue component data; adjusting the first display data based on the target compensation gain to obtain second display data includes: calculating the second red component data in the second display data based on the first red component gain and the first red component data; calculating the second green component data in the second display data based on the first green component gain and the first green component data; calculating the second blue component data in the second display data based on the first blue component gain and the first blue component data.

[0110] In an exemplary embodiment, a display device is provided, and the display device includes any one of the possible display driving chips described above.

[0111] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.), and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant laws, regulations, and standards of relevant countries and regions. For example, the voltages involved in this application are obtained under full authorization.

[0112] It should be understood that the term "a plurality of" mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0113] It should be noted that the terms "first", "second", etc. (if any) in the description and claims of this application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0114] The above are only exemplary embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the principles of this application shall be included within the protection scope of this application.

Claims

1. A display driving chip, characterized in that, The display driving chip includes: An acquisition module, configured to acquire first display data of a target area of a display panel when displaying a first image at a target gray level, where the target gray level is lower than a reference gray level; A determination module, configured to determine a target compensation gain of the target area when displaying the first image based on the first display data and compensation mapping information, where the compensation mapping information indicates a correspondence between first compensation data and the target compensation gain, the first compensation data is compensation data of the target area when displaying a second image at the reference gray level, and the compensation mapping information is determined based on digital gamma data of the target area when displaying the first image and the second image; A calculation module, configured to adjust the first display data based on the target compensation gain to obtain second display data, where the second display data is used for the target area to display the first image.

2. The display driving chip according to claim 1, wherein The determination module is further configured to: Acquire second compensation data of the target area when displaying the first image; Determine the compensation mapping information based on the first compensation data and the second compensation data, where the target compensation gain is a ratio between the second compensation data and the first compensation data.

3. The display driving chip according to claim 2, wherein The determination module is configured to: Acquire first historical digital gamma data of the target area when historically displaying the first image, where the first historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with a reference area of the display panel as the center; Acquire second historical digital gamma data of the target area when historically displaying the first image, where the second historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with the target area as the center; Subtract the second historical digital gamma data from the first historical digital gamma data to obtain the second compensation data.

4. The display driving chip according to any one of claims 1-3, characterized in that, The first compensation data is determined based on a reference image, and the reference image is used to describe a display effect of the display panel on the second image.

5. The display driving chip according to any one of claims 1-4, characterized in that The determination module is further configured to: Acquire first reference compensation data of the target area, where the first reference compensation data is determined based on a reference image, and the reference image is used to describe a display effect of the display panel on the second image; Acquire second reference compensation data of the target area, where the second reference compensation data is a difference between third historical digital gamma data and fourth historical digital gamma data of the target area when historically displaying the second image, the third historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with a reference area of the display panel as the center, and the fourth historical digital gamma data is obtained by performing gamma adjustment calculation on the second image with the target area as the center; Calibrate the first reference compensation data based on the second reference compensation data to obtain the first compensation data.

6. The display driving chip according to any one of claims 1-5, characterized in that, The target compensation gain includes a first red component gain, a first green component gain, and a first blue component gain, and the first display data includes first red component data, first green component data, and first blue component data; the calculation module is configured to: Calculate the second red component data in the second display data based on the first red component gain and the first red component data; Calculate the second green component data in the second display data based on the first green component gain and the first green component data; Calculate the second blue component data in the second display data based on the first blue component gain and the first blue component data.

7. A display compensation method, characterized in that, The method is applied to a display driving chip, and the display driving chip is configured to control a display panel to perform image display. The method includes: Obtain first display data of a target area of the display panel when displaying a first image at a target gray level, where the target gray level is lower than a reference gray level; Determine a target compensation gain of the target area when displaying the first image based on the first display data and compensation mapping information, where the compensation mapping information indicates a correspondence between first compensation data and the target compensation gain, the first compensation data is compensation data of the target area when displaying a second image at the reference gray level, and the compensation mapping information is determined based on digital gamma data of the target area when displaying the first image and the second image; Adjust the first display data based on the target compensation gain to obtain second display data, where the second display data is used for the target area to display the first image.

8. The method according to claim 7, characterized in that The method further includes: Obtain second compensation data of the target area when displaying the first image; Determine the compensation mapping information based on the first compensation data and the second compensation data, and the target compensation gain is a ratio between the second compensation data and the first compensation data.

9. The method according to claim 8, wherein The obtaining the second compensation data of the target area when displaying the first image includes: Obtain first historical digital gamma data of the target area when historically displaying the first image, where the first historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with a reference area of the display panel as the center; Obtain second historical digital gamma data of the target area when historically displaying the first image, where the second historical digital gamma data is obtained by performing gamma adjustment calculation on the first image with the target area as the center; Take the difference between the second historical digital gamma data and the first historical digital gamma data to obtain the second compensation data.

10. A display device, characterized in that, The display device includes the display driving chip according to any one of claims 1-6.

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