Black frame insertion method for display picture and display device

Abstract

The invention discloses a black frame insertion method for a display picture and a display device, and relates to the technical field of display. The display method comprises the following steps: for each frame of display picture, acquiring a picture average level of the display picture; wherein the picture average level is used for indicating the brightness level value of the display picture; determining a black insertion pulse width corresponding to the brightness level value; according to the black frame insertion pulse width, black frames are inserted in the display process of the display picture. According to the embodiment of the invention, the pulse width of the black insertion operation is associated with the brightness level value of the display picture, and when the brightness of the display picture is different, the pulse width of the black insertion operation is also different. According to the embodiment of the invention, the method achieves the targeted execution of the black insertion operation for the display images with different brightness, improves the accuracy of the black insertion operation, and effectively reduces the flicker conditions under different brightness.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a black insertion method for a display screen and a display device. Background Art

[0002] With the development of display technology, users have higher and higher requirements for display effects. Due to the leakage of display panels, the brightness of two adjacent display images is suddenly turned off and then raised. Figure 1 As shown in FIG. 1 , the brightness change causes flickering visible to the naked eye. In order to reduce the flickering phenomenon caused by leakage of the display panel, the related art proposes a black insertion operation. Figure 2 As shown, the display brightness is increased by writing pulses, and black frames are inserted in the display process by inserting black pulses. The black insertion operation can increase the flicker frequency. When the flicker frequency is high enough, the naked eye will hardly notice the flicker. However, the pulse width of the black insertion pulse in the related art is fixed and cannot adapt to different flicker situations. Summary of the invention

[0003] The embodiments of the present application provide a method for black insertion of a display screen and a display device, which achieve targeted black insertion operations for display screens of different brightness, improve the accuracy of the black insertion operations, and effectively reduce flickering at different brightnesses.

[0004] In a first aspect, an embodiment of the present application provides a method for inserting black in a display screen, the method comprising:

[0005] For each frame of a displayed picture, an average level of the displayed picture is obtained; wherein the average level of the displayed picture is used to indicate a brightness level value of the displayed picture;

[0006] Determine a black insertion pulse width corresponding to the brightness level value;

[0007] According to the black insertion pulse width, a black frame is inserted during the display process of the display picture.

[0008] Optionally, obtaining the average picture level of the displayed picture includes: obtaining a brightness characteristic value of each pixel in the displayed picture; performing a gamma transform on the brightness characteristic value of the pixel to obtain a correction value of the pixel; and determining the average value of the correction values ​​of multiple pixels in the displayed picture as the average picture level.

[0009] Optionally, acquiring the brightness characteristic value of each pixel in the display picture includes: determining the brightness characteristic value of the pixel according to the pixel value of the pixel.

[0010] Optionally, determining the brightness characteristic value of the pixel based on the pixel value of the pixel includes: selecting the pixel value that meets a target condition from pixel values ​​of multiple sub-pixels of the pixel as the brightness characteristic value of the pixel.

[0011] Optionally, the target condition includes that the pixel value is maximum.

[0012] Optionally, determining the brightness characteristic value of the pixel according to the pixel value of the pixel includes: performing brightness conversion on the pixel according to pixel values ​​of multiple sub-pixels of the pixel to obtain the brightness characteristic value of the pixel.

[0013] Optionally, the pixel includes a first sub-pixel, a second sub-pixel and a third sub-pixel with different colors; and the brightness conversion of the pixel is performed according to the pixel values ​​of the multiple sub-pixels of the pixel to obtain the brightness characteristic value of the pixel, including: summing the product of the pixel value of the first sub-pixel and a first coefficient, the product of the pixel value of the second sub-pixel and the second coefficient, and the product of the pixel value of the third sub-pixel and the third coefficient to obtain the brightness characteristic value of the pixel; wherein the sum of the first coefficient, the second coefficient and the third coefficient is one.

[0014] Optionally, multiple frames of the display screen are displayed at a variable refresh rate, and at least two frames of the display screen have different average levels of the screen; determining the black insertion pulse width corresponding to the brightness level value includes: determining the black insertion pulse width corresponding to the brightness level value according to a first mapping relationship; wherein the first mapping relationship includes a mapping relationship between different average levels of the screen and different black insertion pulse widths.

[0015] Optionally, in the first mapping relationship, there is a negative correlation between the black insertion pulse width and the average level of the picture.

[0016] Optionally, the display process of the display picture includes a frame holding stage; and inserting a black frame in the display process of the display picture according to the black insertion pulse width includes: inserting the black frame in the frame holding stage of the display picture according to the black insertion pulse width.

[0017] In a second aspect, an embodiment of the present application provides a display device, which is used to execute the above-mentioned black insertion method of the display screen.

[0018] The beneficial effects provided by the embodiments of the present application include at least:

[0019] The embodiment of the present application indicates the brightness level of the display screen through the average level of the display screen, determines the black insertion pulse width corresponding to the brightness level value, and then inserts a black frame in the display process of the display screen according to the black insertion pulse width. The embodiment of the present application associates the pulse width of the black insertion operation with the brightness level value of the display screen. The brightness of the display screen is different, and the pulse width of the black insertion operation is also different. The embodiment of the present application implements the targeted execution of the black insertion operation for display screens of different brightness, improves the accuracy of the black insertion operation, and effectively reduces the flickering under different brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of leakage of a display panel;

[0021] Figure 2 It is a schematic diagram of a black insertion operation;

[0022] Figure 3 It is a flow chart of a method for inserting black in a display screen provided in an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of a first mapping relationship provided in an embodiment of the present application;

[0024] Figure 5 It is a schematic diagram of another first mapping relationship provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0026] In addition, the "plurality" in the embodiments of the present application refers to two or more. The "first" and "second" in the embodiments of the present application are used to distinguish different technical features, and do not indicate any order, quantity or importance.

[0027] The various embodiments provided in this application are similar, and features in different embodiments may be combined with each other.

[0028] The order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0029] See also Figure 3 , Figure 3 1 is a flow chart of a method for inserting black in a display screen provided in an embodiment of the present application. Figure 3 As shown, the method for inserting black in a display screen may include the following steps:

[0030] Step 100: for each frame of the display picture, obtaining the average level of the display picture; wherein the average level of the display picture is used to indicate the brightness level value of the display picture;

[0031] Step 200: Determine a black insertion pulse width corresponding to a brightness level value;

[0032] Step 300: inserting a black frame during the display process of the display image according to the black insertion pulse width.

[0033] The average picture level (Average Picture Level, APL) is used to indicate the brightness level value of the display picture. In some embodiments, there may be a mapping relationship between the average picture level and the brightness level value, for example, the brightness level value may be high, medium or low, and each average picture level may be mapped to a corresponding brightness level value. Of course, the brightness level value may also be equal to the average picture level, that is, the average picture level may also be referred to as the brightness level value. The average picture level and the brightness level value may be used to indicate the brightness of the display picture. Optionally, there is a positive correlation between the average picture level and the brightness of the display picture and / or between the brightness level value and the brightness of the display picture, that is, the larger the average picture level, the higher the brightness of the display picture and / or the larger the brightness level value, the higher the brightness of the display picture; the smaller the average picture level, the lower the brightness of the display picture and / or the smaller the brightness level value, the lower the brightness of the display picture. Of course, the embodiment of the present application does not exclude the possibility of a negative correlation between the average picture level and the brightness of the display picture and / or between the brightness level value and the brightness of the display picture. For each frame of the display picture, the display device may obtain the average picture level of the frame of the display picture. Optionally, the display device can directly obtain the average level of the picture. For example, the average level of the picture is encapsulated in the video stream. When the display device parses the video stream to obtain each frame of the display picture, the average level of the picture of the display picture can be obtained at the same time. Optionally, the display device can also further determine the average level of the picture according to the display parameters of the display picture. For example, when the display device obtains each frame of the display picture, it can obtain the display parameters such as the brightness value and pixel value of each pixel in the display picture, and then calculate the average level of the picture based on the obtained display parameters.

[0034] In some embodiments, the above step 100 may include the following steps:

[0035] Step 110: Obtaining the brightness characteristic value of each pixel in the display image;

[0036] Step 120: performing a gamma transformation on the brightness characteristic value of the pixel to obtain a correction value of the pixel;

[0037] Step 130: Determine the average value of the correction values ​​of a plurality of pixels in the display image as the image average level of the display image.

[0038] The display device can directly or indirectly obtain the brightness characteristic value of each pixel in the display image. In some embodiments, the display device can obtain the pixel value of each pixel, and further determine the brightness characteristic value of each pixel. That is, the above step 110 may include: for each pixel in the display image, according to the pixel value of the pixel, determine the brightness characteristic value of the pixel. Among them, the pixel value of the pixel may refer to the grayscale value of the pixel. For a grayscale image, the pixel value of a pixel may be an integer between 0 and 255 to represent the intensity of the grayscale, where 0 represents black and 255 represents white. For a color image, each pixel may contain three color components of red, green, and blue, so that the pixel value of the pixel contains the pixel values ​​of the three color components, and the pixel value of each color component may be an integer between 0 and 255.

[0039] The embodiments of the present application do not limit the specific method for determining the brightness characteristic value. Optionally, a mapping relationship between different pixel values ​​and different brightness characteristic values ​​is preset in the display device, and the brightness characteristic value of each pixel can be obtained from the mapping relationship according to the pixel value of each pixel. Optionally, each pixel includes multiple sub-pixels, and a pixel value that meets the target condition can be selected from the pixel values ​​of the multiple sub-pixels of each pixel as the brightness characteristic value of the pixel. Optionally, each pixel includes multiple sub-pixels, and the brightness conversion of the pixel can be performed according to the pixel values ​​of the multiple sub-pixels of the pixel to obtain the brightness characteristic value of the pixel. Optionally, the brightness conversion includes weighted averaging of the pixel values ​​of the multiple sub-pixels. For example, a pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different colors; the above-mentioned brightness conversion of the pixel according to the pixel values ​​of multiple sub-pixels of the pixel to obtain the brightness characteristic value of the pixel includes: summing the product of the pixel value of the first sub-pixel and the first coefficient, the product of the pixel value of the second sub-pixel and the second coefficient, and the product of the pixel value of the third sub-pixel and the third coefficient to obtain the brightness characteristic value of the pixel; wherein the sum of the first coefficient, the second coefficient, and the third coefficient is one.

[0040] Exemplarily, each pixel includes three sub-pixels, corresponding to R (Red), G (Green) and B (Blue). A pixel value that meets the target condition can be selected from the pixel values ​​of the three sub-pixels R, G, and B as the brightness characteristic value of the pixel. Optionally, the target condition includes the maximum pixel value, that is, the brightness characteristic value of the pixel Y=Max(R,G,B). Of course, the target condition can also include the minimum pixel value, or the pixel value is located at the median, etc.

[0041] Exemplarily, each pixel includes three sub-pixels, corresponding to R, G and B respectively, and the first sub-pixel mentioned above can be R, the second sub-pixel can be G, and the third sub-pixel can be B. According to the pixel values ​​of the three sub-pixels R, G, and B, the pixel can be converted into brightness to obtain the brightness characteristic value of the pixel. Among them, the brightness conversion can be based on YCbCr, and the brightness characteristic value of the pixel can be the weighted average of the pixel values ​​of the three sub-pixels R, G, and B. During the weighted average processing, the sum of the coefficients corresponding to the three sub-pixels R, G, and B is one. For example, the brightness characteristic value of the pixel Y=0.299*R+0.587*G+0.114*B. Of course, the three coefficients of 0.299, 0.587 and 0.114 can also be implemented as other values, which can be flexibly set in combination with needs in practical applications, and the embodiments of the present application are not limited to this.

[0042] In practical applications, the brightness characteristic values ​​of pixels are usually gamma transformed to compensate for the nonlinear characteristics of the display device so that the displayed image presents a consistent display effect in different display devices. Therefore, after obtaining the brightness characteristic value of each pixel, the embodiment of the present application can first perform a gamma transform on the brightness characteristic value of each pixel to obtain a correction value for each pixel.

[0043] For example, taking the brightness characteristic value of a pixel ranging from 0 to 255 as an example, the correction value of the pixel can be obtained by the formula Y'=(Y / 255) GAM ×255. Wherein, Y' is the correction value of the pixel, Y is the brightness characteristic value of the pixel, and GAM is the gamma value of the display panel.

[0044] For example, taking the brightness characteristic value of a pixel ranging from 0 to 1023 as an example, the correction value of the pixel can be obtained by the formula Y'=(Y / 1023) GAM ×1023. Wherein, Y' is the correction value of the pixel, Y is the brightness characteristic value of the pixel, and GAM is the gamma value of the display panel.

[0045] After gamma transforming the brightness characteristic values ​​of multiple pixels in the display image according to the above method, the average level of the image can be determined according to the correction values ​​of the multiple pixels in the display image. For example, the average level of the image is determined according to the correction values ​​of all pixels in the display image. Of course, the embodiment of the present application does not exclude the technical solution of "determining the average level of the image according to the correction values ​​of some pixels in the display image". The embodiment of the present application can perform average processing or weighted average processing on the correction values ​​of multiple pixels in the display image to obtain the average level of the image.

[0046] Exemplarily, the calculation formula of the average level of the picture may be as follows:

[0047]

[0048] Among them, APL is the average level of the picture, m is the number of pixel rows of the display picture, n is the number of pixel columns of the display picture, and Y' ij is the correction value of the pixel in the i-th row and j-th column in the display image. m is a positive integer, i is a positive integer less than or equal to m. n is a positive integer, j is a positive integer less than or equal to n.

[0049] In the embodiment of the present application, the average level of the picture may indicate the brightness level value of the display picture. After the average level of the picture of the display picture is obtained, the black insertion pulse width corresponding to the brightness level value indicated by the average level of the picture is determined to adapt to different picture brightnesses. In some embodiments, the mapping relationship between different average levels of the picture and different black insertion pulse widths may be preset in the display device, and the black insertion pulse width corresponding to the brightness level value indicated by the average level of the picture may be obtained by looking up the table. Thus, the above step 200 may include: determining the black insertion pulse width corresponding to the brightness level value according to the first mapping relationship. Among them, the first mapping relationship includes the mapping relationship between different average levels of the picture and different black insertion pulse widths. It should be understood that the average levels of the picture of different display pictures may be different, so that for different display pictures, the black insertion pulse width determined based on the first mapping relationship may also be different. Therefore, in the process of displaying the picture by the display device, if the average level of the picture of the display picture changes, the black insertion pulse width may also change accordingly to reduce the flickering under different brightness.

[0050] Taking two different display pictures, a first display picture and a second display picture, as examples, if the average picture level of the first display picture is the same as the average picture level of the second display picture, then the black insertion pulse width of the first display picture determined according to the first mapping relationship is also the same as the black insertion pulse width of the second display picture; if the average picture level of the first display picture is different from the average picture level of the second display picture, then the black insertion pulse width of the first display picture determined according to the first mapping relationship is also different from the black insertion pulse width of the second display picture.

[0051] The average level of the picture in the first mapping relationship can be a value or a range of values. Figure 4 is a schematic diagram of a first mapping relationship provided by an embodiment of the present application, in which each screen average level in the first mapping relationship is a numerical value, and after the screen average level of the display screen is calculated, the black insertion pulse width corresponding to the screen average level can be directly determined from the first mapping relationship. For example, Figure 5is a schematic diagram of another first mapping relationship provided by an embodiment of the present application. Each screen average level in the first mapping relationship is a numerical interval. After the screen average level of the display screen is calculated, the interval to which the screen average level belongs can be determined from the first mapping relationship, and then the black insertion pulse width corresponding to the interval can be obtained. Due to differences in different screen processes, the specific content of the first mapping relationship may also be different for different display devices. In actual applications, the first mapping relationship can be obtained by combining the screen process of the display device and other tests, and the first mapping relationship can be preset in the display device.

[0052] It should be understood that the black insertion method of the display screen provided in the embodiment of the present application can be applied to a display scenario with a fixed refresh rate or a display scenario with a variable refresh rate. For example, the display device can display multiple frames of display screens at a fixed refresh rate, or the display device can display multiple frames of display screens at a variable refresh rate.

[0053] Because under variable refresh rate, for display screens with high grayscale brightness, the write pulse is inserted deeper and for a shorter time; for display screens with low grayscale brightness, the write pulse is inserted shallower and for a longer time. In order to make the brightness change more uniform and regular under different brightness of variable refresh rate, in some embodiments, there is a negative correlation between the black insertion pulse width and the average level of the picture in the first mapping relationship. The larger the average level of the picture, the smaller the black insertion pulse width; the smaller the average level of the picture, the larger the black insertion pulse width. The larger the average level of the picture, the higher the brightness of the display screen, the deeper the write pulse is inserted, so the black insertion pulse can also be inserted deeper, and the black insertion pulse width can be set smaller. The smaller the average level of the picture, the lower the brightness of the display screen, the shallower the write pulse is inserted, so the black insertion pulse can also be inserted shallower, and the black insertion pulse width can be set larger.

[0054] In the case where multiple frames of display images are displayed at a variable refresh rate, taking two different display images, a first display image and a second display image, as examples, if the average picture level of the first display image is greater than the average picture level of the second display image, the black insertion pulse width of the first display image may be smaller than the black insertion pulse width of the second display image; if the average picture level of the first display image is smaller than the average picture level of the second display image, the black insertion pulse width of the first display image may be larger than the black insertion pulse width of the second display image.

[0055] In step 300, the display device inserts a black frame in the display process of the display picture according to the black insertion pulse width determined in step 200. Among them, the display device can insert a black frame in any time period during the display process of the display picture, and the embodiment of the present application is not limited to this. It can be flexibly set in combination with needs in actual applications. Usually, since the display time of one frame of the display picture includes a writing frame stage and at least one holding frame stage, data needs to be written in the writing frame stage, but no data needs to be written in the holding frame stage, so the black insertion operation can be performed in the holding frame stage. Based on this, in some embodiments, the above step 300 may include: inserting a black frame in the holding frame stage of the display picture according to the black insertion pulse width. Among them, the display process of the display picture includes the holding frame stage.

[0056] In summary, the black insertion method of the display screen provided in the embodiment of the present application indicates the brightness level value of the display screen through the average level of the display screen, determines the black insertion pulse width corresponding to the brightness level value, and then inserts a black frame in the display process of the display screen according to the black insertion pulse width. The embodiment of the present application associates the pulse width of the black insertion operation with the brightness level value of the display screen. The brightness of the display screen is different, and the pulse width of the black insertion operation is also different. The embodiment of the present application realizes the targeted execution of the black insertion operation for display screens of different brightness, improves the accuracy of the black insertion operation, and effectively reduces the flickering under different brightness.

[0057] In addition, under variable refresh rate, for display screens with high grayscale brightness, the write pulse is inserted deeper and for a shorter time; for display screens with low grayscale brightness, the write pulse is inserted shallower and for a longer time. Based on the black insertion method provided in the embodiment of the present application, under variable refresh rate, for display screens with high grayscale brightness, the black insertion pulse is inserted deeper and for a shorter time; for display screens with low grayscale brightness, the black insertion pulse is inserted shallower and for a longer time. Thus, under different brightness of variable refresh rate, the brightness change can be made more uniform and regular, effectively reducing the flickering under different brightness of variable refresh rate.

[0058] The embodiment of the present application also provides a display device, which can be used to perform the black insertion method of the above display screen. The display device provided in the embodiment of the present application includes but is not limited to: AMOLED (Active Matrix Organic Light Emitting Diode, active matrix organic light emitting diode) display, Micro LED (Micro Light Emitting Diode, micro light emitting diode) display, Mini Led (Miniature Light Emitting Diode, mini light emitting diode) display, etc.

[0059] In an embodiment of the present application, the display device is used to: obtain an average picture level of the display picture for each frame of the display picture; wherein the average picture level is used to indicate a brightness level value of the display picture; determine a black insertion pulse width corresponding to the brightness level value; and insert a black frame during the display process of the display picture according to the black insertion pulse width.

[0060] In some embodiments, the display device is also used to: obtain a brightness characteristic value of each pixel in the display image; perform a gamma transform on the brightness characteristic value of the pixel to obtain a correction value of the pixel; and determine an average value of the correction values ​​of multiple pixels in the display image as the average level of the image.

[0061] In some embodiments, the display device is further used to determine the brightness characteristic value of the pixel based on the pixel value of the pixel.

[0062] In some embodiments, the display device is further used to: select the pixel value that meets the target condition from the pixel values ​​of multiple sub-pixels of the pixel as the brightness characteristic value of the pixel.

[0063] In some embodiments, the target condition includes the pixel value being maximum.

[0064] In some embodiments, the display device is further used to: perform brightness conversion on the pixel according to pixel values ​​of multiple sub-pixels of the pixel to obtain the brightness characteristic value of the pixel.

[0065] In some embodiments, the pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel of different colors; the display device is also used to: sum the product of the pixel value of the first sub-pixel and a first coefficient, the product of the pixel value of the second sub-pixel and the second coefficient, and the product of the pixel value of the third sub-pixel and the third coefficient to obtain the brightness characteristic value of the pixel; wherein the sum of the first coefficient, the second coefficient, and the third coefficient is one.

[0066] In some embodiments, multiple frames of the display screen are displayed at a variable refresh rate, and at least two frames of the display screen have different average levels of the screen; the display device is also used to: determine the black insertion pulse width corresponding to the brightness level value according to a first mapping relationship; wherein the first mapping relationship includes a mapping relationship between different average levels of the screen and different black insertion pulse widths.

[0067] In some embodiments, in the first mapping relationship, there is a negative correlation between the black insertion pulse width and the average level of the picture.

[0068] In some embodiments, the display process of the display picture includes a frame holding stage; the display device is further used to: insert the black frame in the frame holding stage of the display picture according to the black insertion pulse width.

[0069] For a detailed description of the steps performed by the display device and the corresponding beneficial effects, please refer to the detailed description of the black insertion method of the display screen above, which will not be elaborated here.

[0070] The above is a detailed introduction to a black insertion method and a display device for a display screen provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for inserting black in a display screen, characterized in that: The black insertion method comprises: For each frame of a displayed picture, an average level of the displayed picture is obtained; wherein the average level of the displayed picture is used to indicate a brightness level value of the displayed picture; Determine a black insertion pulse width corresponding to the brightness level value; According to the black insertion pulse width, a black frame is inserted during the display process of the display picture.

2. The black insertion method according to claim 1, characterized in that: The step of obtaining an average level of the displayed picture includes: Obtaining a brightness characteristic value of each pixel in the display image; Performing a gamma transformation on the brightness characteristic value of the pixel to obtain a correction value of the pixel; An average value of the correction values ​​of a plurality of the pixels in the display picture is determined as the picture average level.

3. The black insertion method according to claim 2, characterized in that: The obtaining of the brightness characteristic value of each pixel in the display picture includes: The brightness characteristic value of the pixel is determined according to the pixel value of the pixel.

4. The black insertion method according to claim 3, characterized in that: Determining the brightness characteristic value of the pixel according to the pixel value of the pixel includes: From the pixel values ​​of a plurality of sub-pixels of the pixel, the pixel value that satisfies a target condition is selected as the brightness characteristic value of the pixel.

5. The black insertion method according to claim 4, characterized in that: The target condition includes that the pixel value is maximum.

6. The black insertion method according to claim 3, characterized in that: Determining the brightness characteristic value of the pixel according to the pixel value of the pixel includes: The pixel is subjected to brightness conversion according to the pixel values ​​of a plurality of sub-pixels of the pixel to obtain the brightness characteristic value of the pixel.

7. The black insertion method according to claim 6, characterized in that: The pixel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different colors; and performing brightness conversion on the pixel according to the pixel values ​​of the plurality of sub-pixels of the pixel to obtain the brightness characteristic value of the pixel includes: The product of the pixel value of the first sub-pixel and the first coefficient, the product of the pixel value of the second sub-pixel and the second coefficient, and the product of the pixel value of the third sub-pixel and the third coefficient are summed to obtain the brightness characteristic value of the pixel; wherein the sum of the first coefficient, the second coefficient and the third coefficient is one.

8. The black insertion method according to claim 1, characterized in that: The multiple frames of the display pictures are displayed at a variable refresh rate, and at least two frames of the display pictures have different average levels; The determining of the black insertion pulse width corresponding to the brightness level value comprises: According to a first mapping relationship, a black insertion pulse width corresponding to the brightness level value is determined; wherein the first mapping relationship includes a mapping relationship between different average levels of the picture and different black insertion pulse widths.

9. The black insertion method according to claim 8, characterized in that: In the first mapping relationship, there is a negative correlation between the black insertion pulse width and the average level of the picture.

10. The black insertion method according to claim 1, characterized in that: The display process of the display picture includes a frame holding stage; The step of inserting a black frame during display of the display picture according to the black insertion pulse width includes: The black frame is inserted in the frame holding phase of the display image according to the black insertion pulse width.

11. A display device, characterized in that: The display device is used to execute the black insertion method for display images as described in any one of claims 1 to 10.

Images