Display compensation method and liquid crystal display device

Abstract

The application discloses a display compensation method and a liquid crystal display device. The display compensation method adjusts backlight brightness corresponding to backlight partitions through a backlight compensation table, can coarsely adjust brightness difference of a display panel, can improve contrast of a picture, and is beneficial to guaranteeing continuity of gray scale transition in the picture. The display compensation method adjusts gray scale data corresponding to display partitions through a display compensation table, realizes fine adjustment of brightness difference of the display panel, and can further improve uniformity of display brightness.

Description

Technical Field

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

[0002] For display panels with poor brightness uniformity, the brightness difference between different areas is too large. In the process of brightness compensation for display panels, it is necessary to consider both the brightness uniformity after compensation to meet the specified index and the continuity of grayscale transition in the image after compensation.

[0003] However, most existing brightness compensation solutions only compensate for the display brightness of the display panel. This solution cannot improve the uniformity of brightness while ensuring the continuity of grayscale transitions in the image, leading to display problems. Summary of the Invention

[0004] This application provides a display compensation method and a liquid crystal display device to alleviate the technical problem of not being able to improve brightness uniformity while ensuring the continuity of grayscale transitions in the image.

[0005] In a first aspect, this application provides a display compensation method, which includes: obtaining a first target display brightness and a first actual display brightness of each display partition; determining a backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display partition; compensating the backlight brightness of the backlight partition according to the backlight compensation table; obtaining a second target display brightness and a second actual display brightness of each display partition after compensation by the backlight compensation table; determining a display compensation table based on the brightness difference between the second target display brightness and the second actual display brightness of each display partition; and compensating the display brightness of the display partition according to the display compensation table.

[0006] In some embodiments, the step of determining the backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display partition includes: establishing a mapping relationship between the backlight partition and the display partition, wherein the backlight partition and the display partition in the mapping relationship overlap in the direction of backlight emission; calculating the brightness difference between the first target display brightness and the first actual display brightness of the display partition; determining the brightness difference as the backlight brightness compensation value of the backlight partition corresponding to the display partition; and obtaining the backlight brightness compensation value of the backlight partition corresponding to all display partitions as the backlight compensation table.

[0007] In some embodiments, the step of calculating the brightness difference between the first target display brightness and the first actual display brightness of the display partition; determining the brightness difference as the backlight brightness compensation value of the backlight partition corresponding to the display partition further includes: determining the backlight brightness compensation value of a specific backlight partition; obtaining the backlight brightness compensation values ​​of other backlight partitions besides the specific backlight partition by interpolation based on the backlight brightness compensation value of the specific backlight partition; and obtaining the backlight brightness compensation values ​​of the backlight partitions corresponding to all display partitions in a backlight compensation table further includes: compiling the backlight brightness compensation values ​​of the specific backlight partition and the backlight brightness compensation values ​​of other backlight partitions into a backlight compensation table.

[0008] In some embodiments, the step of determining the backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display partition further includes: determining the type of display grayscale of the frame to be displayed; and calling the corresponding backlight sub-compensation table according to the type of display grayscale of the frame to be displayed.

[0009] In some embodiments, after the step of compensating the backlight brightness of the backlight zones according to the backlight compensation table, the backlight brightness of each backlight zone is further smoothed.

[0010] In some embodiments, the display compensation method further includes: configuring each display partition to include a central display partition and multiple peripheral display partitions; constructing multiple peripheral display partitions around the central display partition; determining the display brightness of the central display partition as a first target display brightness, and the display brightness of the central display partition after compensation by a backlight compensation table as a second target display brightness.

[0011] In some embodiments, the step of determining a display compensation table based on the brightness difference between the second target display brightness and the second actual display brightness of each display partition includes: determining a brightness weighting coefficient for each peripheral display partition; obtaining a target brightness for the corresponding peripheral display partition based on the second target display brightness, the second actual display brightness, and the brightness weighting coefficient; determining the difference between the target brightness and the second actual display brightness of the peripheral display partition as the display brightness compensation value for the peripheral display partition; and aggregating the display brightness compensation values ​​of each peripheral display partition into a display compensation table.

[0012] In some embodiments, the step of obtaining the target brightness of the corresponding peripheral display zone based on the second target display brightness, the second actual display brightness, and the brightness weighting coefficient includes: the target brightness is obtained according to the formula W = n*center + (1-n)*other; where center, other, n, and W are the second target display brightness, the second actual display brightness, the brightness weighting coefficient, and the target brightness, respectively.

[0013] Secondly, this application provides a display compensation method, which includes: compensating the backlight brightness of a backlight zone according to a backlight compensation table; and compensating the display brightness of a display zone according to a display compensation table.

[0014] In some embodiments, the display compensation table is determined based on the target display brightness after backlight compensation by the backlight compensation table and the actual display brightness of the corresponding display zone.

[0015] In some embodiments, the display compensation method further includes: first compensating the backlight brightness of the backlight zone according to the backlight compensation table; and then compensating the display brightness of the display zone according to the display compensation table.

[0016] Thirdly, this application provides a liquid crystal display device, which includes a display driver board, a display panel, a backlight module, and a backlight driver board. The display driver board includes a storage module for storing the display compensation table in at least one of the above embodiments. The display panel is connected to the display driver board. The backlight module is used to provide corresponding backlight brightness. The backlight driver board is connected to the backlight module and includes a compensation unit and a storage unit. The compensation unit is connected to the storage unit, which stores the backlight compensation table in at least one of the above embodiments. The compensation unit is used to call up the backlight compensation table during operation.

[0017] In some embodiments, the backlight driver board compensates for the backlight brightness according to a backlight compensation table, and the display driver board compensates for the display brightness of the display panel according to a display compensation table.

[0018] In some embodiments, a backlight compensation meter is used to reduce the brightness difference of the display panel and improve the screen contrast of the display panel, while a display compensation meter is used to reduce the brightness difference of the display panel.

[0019] In some embodiments, the backlight area of ​​the backlight module includes multiple backlight zones, and the backlight driver board adjusts the backlight brightness of at least one backlight zone according to a backlight compensation table.

[0020] In some embodiments, the display area of ​​the display panel includes multiple display zones, and a backlight zone provides corresponding backlight brightness for at least one display zone.

[0021] The display compensation method and liquid crystal display device provided in this application can coarsely adjust the brightness difference of the display panel by adjusting the backlight brightness of the corresponding backlight zone through the backlight compensation table, and at the same time improve the contrast of the picture, which is conducive to ensuring the continuity of grayscale transition in the picture; and finely adjust the brightness difference of the display panel by adjusting the grayscale data of the corresponding display zone through the display compensation table, which can further improve the uniformity of display brightness. Attached Figure Description

[0022] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0023] Figure 1 This is a schematic flowchart of a display compensation method provided in an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the display partition and backlight partition provided in the embodiments of this application.

[0025] Figure 3 This is another schematic flowchart illustrating the display compensation method provided in an embodiment of this application.

[0026] Figure 4 This is a schematic diagram of the structure of a liquid crystal display device provided in an embodiment of this application.

[0027] Figure 5 This is another schematic flowchart of the display compensation method provided in the embodiments of this application.

[0028] Figure 6 This is a waveform diagram of the display compensation method provided in an embodiment of this application.

[0029] Figure 7 This is a schematic diagram illustrating the discontinuity of gray levels when a display device shows a grayscale transition image in related technologies.

[0030] Figure 8 This is a schematic diagram illustrating the continuity of grayscale in the image provided in the embodiments of this application.

[0031] Figure 9 A comparative diagram of relevant test data provided in the embodiments of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] In view of the aforementioned technical problem of failing to simultaneously improve brightness uniformity and ensure the continuity of grayscale transitions in the image, this embodiment provides a display compensation method. Please refer to [link to relevant documentation]. Figures 1 to 9 ,like Figure 1 As shown, the display compensation method includes the following steps:

[0034] Step S10: Obtain the first target display brightness and the first actual display brightness of each display zone.

[0035] Step S20: Determine the backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display zone.

[0036] Step S30: Compensate the backlight brightness of the backlight zones according to the backlight compensation table.

[0037] Step S40: Obtain the second target display brightness and the second actual display brightness of each display zone after compensation by the backlight compensation table.

[0038] Step S50: Determine the display compensation table based on the brightness difference between the second target display brightness and the second actual display brightness of each display zone.

[0039] Step S60: Compensate the display brightness of the display zones according to the display compensation table.

[0040] It is understood that the display compensation method and liquid crystal display device provided in this embodiment can coarsely adjust the brightness difference of the display panel by adjusting the backlight brightness of the corresponding backlight zone through the backlight compensation table, and at the same time improve the contrast of the picture, which is conducive to ensuring the continuity of grayscale transition in the picture; and finely adjust the brightness difference of the display panel by adjusting the grayscale data of the corresponding display zone through the display compensation table, which can further improve the uniformity of display brightness.

[0041] It should be noted that in this embodiment, the backlight brightness of the corresponding backlight zone is compensated according to the backlight compensation table, and then the grayscale data of the corresponding display zone is compensated according to the display compensation table. This is one of the improvements in timing compensation in this application. It is understood that this execution order can achieve better improvement results.

[0042] Among them, the technique of compensating the grayscale data of the corresponding display partition according to the display compensation table can also be called the brightness uniformity (Demura) algorithm. It can compensate for the uneven brightness of the display panel and improve the display effect. The specific process of the brightness uniformity algorithm can be, but is not limited to: dividing the display area into N non-overlapping areas, using the brightness of the central area as a reference, and adjusting the brightness of the entire display area to be uniform. Its compensation logic can be to use a camera to collect the display brightness distribution of the display panel. When it is detected that the display brightness of a certain area is higher or lower than the display brightness of the central area, the display brightness of the central area and other areas will be weighted to calculate the target value of the area, as shown in equation (1):

[0043] W = n * center + (1 - n) * other (1)

[0044] Where center represents the display brightness of the central area; other represents the display brightness of one of the other areas; n is the brightness weighting coefficient; and W is the target brightness of one of the other areas. It can be understood that center can also represent the display brightness of a specific area.

[0045] In other words, the target brightness of the corresponding peripheral display zone is obtained based on the second target display brightness, the second actual display brightness, and the brightness weighting coefficient, which can be obtained according to the formula W = n * center + (1 - n) * other. Here, center, other, n, and W are the second target display brightness, the second actual display brightness, the brightness weighting coefficient, and the target brightness, respectively.

[0046] The choice of the value of n directly affects the compensation effect. For panels with poor in-plane uniformity, the brightness difference between other areas and the central area is too large. When n is chosen close to 1 to make the brightness of all areas move closer to the center point, the excessive brightness compensation data in the mura areas will lead to discontinuous grayscale transitions in the compensated image. When n is chosen too small, the brightness uniformity index after compensation will not be met. For example, for single-ended driven products, i.e., COF (Chip On Flex / Chip On Film) on only one side of the display area, due to RC delay, the near-COF end is fully charged, resulting in high brightness; the far-COF end is undercharged, resulting in low brightness, thus causing huge in-plane brightness differences. Therefore, if a single-ended driven product is only processed by the Demura algorithm, it will be unable to meet the problem of improving brightness uniformity while ensuring the continuity of grayscale transitions, affecting the optical quality of the product. Therefore, this embodiment improves the backlight adjustment capability by controlling the overall backlight brightness in zones, and also increases the influence of backlight brightness on display brightness / grayscale data, thereby increasing the screen contrast and ensuring the continuity of grayscale transition in the screen.

[0047] It should be noted that the difference between the target value and the actual brightness value of the area is used as the brightness compensation value for that area. By analogy, the brightness compensation values ​​for different areas can be obtained. By collecting these brightness compensation values ​​from different areas, the above-mentioned display compensation table can be obtained. Then, the display panel can optimize mild brightness unevenness by executing the display compensation table during operation.

[0048] The backlight brightness of each backlight zone can be adjusted individually to improve the flexibility of backlight brightness adjustment. The backlight brightness of each backlight zone can be adjusted by at least one of voltage, current, emission time, and duty cycle to obtain the backlight brightness of different backlight zones in this embodiment.

[0049] Backlight zone is a zone within the light-emitting area of ​​the backlight module, and backlight brightness is the brightness of the corresponding backlight zone.

[0050] Here, a display zone is a partition within the display area of ​​the display panel, and the display brightness is the brightness of the corresponding display zone. It is understood that each display zone may include one or more pixels; preferably, each display zone includes multiple pixels arranged in an array.

[0051] In this context, the backlight zones and display zones that are in a corresponding or mapping relationship overlap in the thickness direction of the display device, or the backlight zones provide corresponding backlight brightness to the display zones that are in a corresponding or mapping relationship. For example... Figure 2 As shown, the display area AA includes display partitions 01 to 09, and the backlight area BA includes backlight partitions 11 to 19. Backlight partitions 11 to 19 provide corresponding backlight brightness to display partitions 01 to 09 respectively.

[0052] In one embodiment, step S20 includes: establishing a mapping relationship between backlight partitions and display partitions, wherein the backlight partitions and display partitions in the mapping relationship overlap in the direction of backlight emission; calculating the brightness difference between the first target display brightness and the first actual display brightness of the display partition; determining the brightness difference as the backlight brightness compensation value of the backlight partition corresponding to the display partition; and obtaining the backlight brightness compensation value of the backlight partition corresponding to all display partitions as a backlight compensation table.

[0053] It should be noted that in the same mapping relationship, one backlight zone can correspond to one or more display zones. In other words, the area of ​​the display zone can be smaller than that of the backlight zone. In this way, the degree of fine compensation for the display brightness of the display zone can be improved when using the display compensation table for compensation.

[0054] Among them, the brightness difference between the display brightness of different zones of the display panel and the target display brightness is used as the corresponding backlight brightness compensation value, which can better improve the contrast of the display screen. The more obvious the contrast, the better the continuity of grayscale transition. Thus, under the effect of bidirectional compensation, not only can the uniformity of display brightness be improved, but the continuity of grayscale transition in the screen can also be guaranteed.

[0055] In one embodiment, the step of calculating the brightness difference between the first target display brightness and the first actual display brightness of the display partition; determining the brightness difference as the backlight brightness compensation value of the backlight partition corresponding to the display partition further includes: determining the backlight brightness compensation value of a specific backlight partition; obtaining the backlight brightness compensation values ​​of other backlight partitions besides the specific backlight partition by interpolation based on the backlight brightness compensation value of the specific backlight partition; and obtaining the backlight brightness compensation values ​​of the backlight partitions corresponding to all display partitions in a backlight compensation table further includes: compiling the backlight brightness compensation values ​​of the specific backlight partition and the backlight brightness compensation values ​​of other backlight partitions into a backlight compensation table.

[0056] Specifically, a specific backlight zone can be one or more of all backlight zones, and other backlight zones can be the remaining backlight zones among all backlight zones. Both specific backlight zones and other backlight zones can be specified as needed. The brightness compensation value of a specific backlight zone is the brightness difference between the first target display brightness and the first actual display brightness of the display zone corresponding to that specific backlight zone.

[0057] The backlight compensation table can include backlight compensation values ​​for different backlight zones. These backlight compensation values ​​can be distributed in a certain form in the table, such as one row with multiple columns, multiple rows with one column, or multiple rows with multiple columns, etc. Each backlight compensation value can be a brightness data, such as 0.5 nit, 1.0 nit, 2 nit, or 5 nit, etc. The backlight driver board converts the backlight compensation values ​​or directly superimposes them onto the original backlight data, and then adjusts the final backlight brightness of the corresponding backlight zone based on the superimposition result.

[0058] It should be noted that this embodiment can generate backlight brightness compensation values ​​for all backlight zones with fewer backlight brightness compensation values, which can reduce the number of backlight brightness compensation values ​​required for other backlight zones in the early exploration process, and also reduce the complexity of the backlight compensation table manufacturing process.

[0059] It should be noted that there are many types of interpolation methods in the related technologies. The improvers of the technical solutions can adaptively select the corresponding interpolation method according to the particularity of the technical solutions themselves. This requires creative work based on the general technical personnel to obtain the inventive concept of this embodiment.

[0060] In one embodiment, the step of determining the backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display partition further includes: determining the type of display grayscale of the frame to be displayed; and calling the corresponding backlight sub-compensation table according to the type of display grayscale of the frame to be displayed.

[0061] Specifically, the backlight compensation table may include two of the following: a low grayscale backlight compensation table, a medium grayscale backlight compensation table, and a high grayscale backlight compensation table. For example, a low grayscale backlight compensation table and a medium grayscale backlight compensation table, or a low grayscale backlight compensation table and a high grayscale backlight compensation table, or a medium grayscale backlight compensation table or a high grayscale backlight compensation table.

[0062] The grayscale of the frame to be displayed corresponds to the average brightness of the frame to be displayed, and the average brightness of the frame to be displayed is equal to the sum of the brightness of each sub-pixel in the frame to be displayed divided by the number of each sub-pixel.

[0063] It should be noted that in this embodiment, the backlight compensation table is split into two backlight sub-compensation tables corresponding to different grayscale ranges. Calling the corresponding grayscale backlight sub-compensation table according to the display grayscale type of the frame to be displayed can more accurately compensate for the display brightness.

[0064] In one embodiment, the display compensation method further includes: configuring a backlight compensation table including a low grayscale backlight sub-compensation table, a medium grayscale backlight sub-compensation table, and a high grayscale backlight compensation table; determining the display grayscale type of the frame to be displayed; and calling the corresponding backlight sub-compensation table according to the display grayscale type of the frame to be displayed.

[0065] It should be noted that in this embodiment, the backlight compensation table is split into three backlight sub-compensation tables corresponding to three different grayscale ranges. Calling the corresponding grayscale backlight sub-compensation table according to the display grayscale type of the frame to be displayed can further compensate for the display brightness more accurately.

[0066] In one embodiment, the display compensation method further includes: configuring the display grayscale type of the frame to be displayed to include low grayscale, medium grayscale and high grayscale; determining that the display grayscale type of the frame to be displayed belongs to low grayscale; and calling the low grayscale backlight compensation table.

[0067] It should be noted that, in this embodiment, the display brightness can be further compensated more accurately by calling the low grayscale backlight compensation table when the display grayscale type of the frame to be displayed is low grayscale.

[0068] In one embodiment, the display compensation method further includes: configuring the display grayscale type of the frame to be displayed to include low grayscale, medium grayscale and high grayscale; determining that the display grayscale type of the frame to be displayed belongs to medium grayscale; and calling the medium grayscale backlight compensation table.

[0069] It should be noted that, in this embodiment, the display brightness can be further compensated more accurately by calling the medium grayscale backlight compensation table when the display grayscale type of the frame to be displayed is medium grayscale.

[0070] In one embodiment, the display compensation method further includes: configuring the display grayscale type of the frame to be displayed to include low grayscale, medium grayscale and high grayscale; determining that the display grayscale type of the frame to be displayed belongs to high grayscale; and calling the high grayscale backlight compensation table.

[0071] It should be noted that, in this embodiment, the display brightness can be further compensated more accurately by calling the high grayscale backlight compensation table when the display grayscale type of the frame to be displayed is high grayscale.

[0072] In one embodiment, after the step of compensating the backlight brightness of the backlight zones according to the backlight compensation table, the method further includes: smoothing the backlight brightness of each backlight zone.

[0073] It should be noted that smoothing the backlight brightness after compensation by the backlight compensation table can further adjust the overall distribution of backlight brightness, thereby further reducing the difference in display brightness.

[0074] In one embodiment, the display compensation method further includes: configuring each display partition to include a central display partition and multiple peripheral display partitions; constructing multiple peripheral display partitions around the central display partition; determining the display brightness of the central display partition as a first target display brightness, and the display brightness of the central display partition after compensation by a backlight compensation table as a second target display brightness.

[0075] It is understandable that the first target display brightness can be any display brightness that can improve the uniformity of brightness in the display area. However, this embodiment uses the display brightness of the central display zone as the first target display brightness, which is more in line with the needs of single-end driven products. Using the display brightness of the central display zone as the first target display brightness means that it can be regarded as a central area regardless of the vertical and / or vertical orientation of the display panel. The value is more moderate, and less adjustment is needed during the compensation process to approach brightness uniformity.

[0076] In one embodiment, the step of determining a display compensation table based on the brightness difference between the second target display brightness and the second actual display brightness of each display partition includes: determining a brightness weighting coefficient for each peripheral display partition; obtaining a target brightness for the corresponding peripheral display partition based on the second target display brightness, the second actual display brightness, and the brightness weighting coefficient; determining the difference between the target brightness and the second actual display brightness of the peripheral display partition as the display brightness compensation value for the peripheral display partition; and collecting the display brightness compensation values ​​of each peripheral display partition to form a display compensation table.

[0077] In one embodiment, such as Figure 3 As shown, this embodiment provides a display compensation method, which includes the following steps:

[0078] Step S100: Execute the backlight compensation table and display compensation table.

[0079] Step S200: Compensate the backlight brightness of the backlight zones according to the backlight compensation table.

[0080] Step S300: Compensate the display brightness of the display zones according to the display compensation table.

[0081] It should be noted that, with Figure 1 Compared to the technical solution shown, which focuses on the manufacturing process of the backlight compensation table and display compensation table, this embodiment stores the manufactured backlight compensation table and display compensation table in the liquid crystal display device. When the display device is powered on and initialized, and enters the display state, the backlight compensation table and display compensation table are executed. During the execution of the backlight compensation table and display compensation table, the display compensation method provided in this embodiment adjusts the backlight brightness of the corresponding backlight zones through the backlight compensation table, which can coarsely adjust the brightness differences of the display panel and improve the contrast of the image, thus helping to ensure the continuity of grayscale transitions in the image. Furthermore, by adjusting the grayscale data of the corresponding display zones through the display compensation table, fine-tuning of the brightness differences of the display panel can be achieved, thereby further improving the uniformity of display brightness.

[0082] It should be noted that step S100 is optional. That is, steps S200 and S300 can be performed directly without step S100. According to the description of this application, it can also improve the uniformity of display brightness.

[0083] Specifically, during operation, the display device can acquire raw backlight data and raw display data. Then, it superimposes backlight compensation data from the backlight compensation table onto the raw backlight data to control backlight brightness, and superimposes display compensation data from the display compensation table onto the raw display data to control display brightness. It can be understood that the raw backlight data and / or backlight compensation data can be used to adjust backlight brightness; the raw display data and / or display compensation data can be used to adjust display brightness.

[0084] In one embodiment, the display compensation table is determined based on the target display brightness after backlight compensation by the backlight compensation table and the actual display brightness of the corresponding display zone.

[0085] It should be noted that this embodiment explains the order and internal logic of the creation of the backlight compensation table and the display compensation table. It can be understood that this is beneficial to simultaneously improve the uniformity of display brightness and the continuity of grayscale transitions in the image.

[0086] In one embodiment, the display compensation method further includes: first compensating the backlight brightness of the backlight zone according to the backlight compensation table; and then compensating the display brightness of the display zone according to the display compensation table.

[0087] It should be noted that the execution order of the backlight compensation table and the display compensation table can be random or not in any particular order, but executing the backlight compensation table first and then the display compensation table can be a preferred embodiment.

[0088] In one embodiment, such as Figure 4 As shown, this embodiment provides a liquid crystal display device, which includes a display driver board 200, a display panel 300, a backlight driver board 400, and a backlight module 500. The display driver board 200 includes a storage module 210, which stores the display compensation table in at least one embodiment described above. The display panel 300 is connected to the display driver board 200; the backlight driver board 400 is connected to the backlight module 500, and the backlight driver board 400 includes a compensation unit 410 and a storage unit 420, which are connected together. The backlight module 500 provides corresponding backlight brightness; the storage unit 420 stores the backlight compensation table in at least one embodiment described above, and the compensation unit 410 calls the backlight compensation table during operation.

[0089] It is understood that the liquid crystal display device provided in this embodiment can coarsely adjust the brightness difference of the display panel 300 by adjusting the backlight brightness of the corresponding backlight zone through the backlight compensation table, and at the same time improve the contrast of the picture, which is conducive to ensuring the continuity of grayscale transition in the picture; and finely adjust the brightness difference of the display panel 300 by adjusting the grayscale data of the corresponding display zone through the display compensation table, which can further improve the uniformity of display brightness.

[0090] Either the storage unit 420 or the storage module 210 can be a storage chip, such as flash memory.

[0091] In one embodiment, the liquid crystal display device further includes a system-on-a-chip 100, which is connected to the display driver board 200 and the backlight driver board 400.

[0092] In one embodiment, the backlight driver board 400 compensates for the backlight brightness according to a backlight compensation table, and the display driver board compensates for the display brightness of the display panel 300 according to a display compensation table.

[0093] In one embodiment, the backlight compensation meter is used to reduce the brightness difference of the display panel 300 and improve the screen contrast of the display panel 300. The display compensation meter is used to reduce the brightness difference of the display panel 300.

[0094] In one embodiment, the backlight module 500 includes a plurality of backlight zones, and the backlight driver board 400 adjusts the backlight brightness of at least one backlight zone according to a backlight compensation table.

[0095] In one embodiment, the display area of ​​the display panel 300 includes multiple display zones, and a backlight zone provides corresponding backlight brightness for at least one display zone.

[0096] It should be noted that the inventive concept of the above-mentioned display compensation method can be expressed as follows: Figure 5 As shown, firstly, the image displayed on the display panel is photographed. Then, the coordinates and brightness values ​​of the corresponding sub-pixels are obtained by analyzing the image. Subsequently, backlight compensation data is calculated according to some steps of the aforementioned display compensation method. Then, the backlight compensation data of each sub-pixel is collected to obtain the corresponding backlight compensation table, i.e., backlight compensation data. Then, the backlight compensation effect is judged. If the backlight compensation effect does not meet the predetermined index, the backlight compensation steps in the above method are repeated until the index is met. If the backlight compensation effect meets the predetermined index, display compensation, i.e., the Demura algorithm, is executed. It is understood that in this process, both backlight compensation and display compensation need to be performed to obtain the technical effects of the corresponding embodiments in this application.

[0097] It should be noted that, Figure 5 The Demura algorithm and backlight compensation shown can be used in any order during the manufacturing process. However, it is preferable to execute them synchronously to achieve the best display effect.

[0098] Figure 6 This is a waveform diagram illustrating the display compensation method provided in this application embodiment. Curve S1 represents the display brightness waveform trend before any compensation, curve S2 represents the display brightness waveform trend after backlight compensation based on curve S1, curve S3 represents the display brightness waveform trend after display compensation, and curve S4 represents the set target display brightness. It should be noted that after backlight compensation as shown in curve S2 and display compensation as shown in curve S3, the brightness of the display panel can reach a relatively constant or unchanging brightness as shown in curve S4, thus improving the uniformity of display brightness.

[0099] like Figure 6As shown, X represents the position, where X=0 represents the center point of the central area of ​​the display panel, and Y represents the pure grayscale brightness distribution of the display panel. Curve S1 represents the original brightness distribution, and curve S4 represents the target display brightness. It can be seen that as X moves further away from the brightness center point corresponding to X=0, the brightness of the corresponding area decreases. Directly using the Demura algorithm for compensation will result in discontinuous grayscale transitions in the image. This application first raises the brightness value shown in curve S1 to the brightness value shown in curve S2 through backlight compensation; then, it uses the Demura algorithm to make fine adjustments to the uneven brightness, such as dimming bright areas and brightening dark areas. The compensation amount adjusted in the Demura algorithm is shown in curve S2. That is to say, based on curve S1, backlight compensation can be used to adjust to the brightness value shown in curve S2, and then the compensation amount shown in curve S3 is superimposed to achieve the brightness value shown in curve S4.

[0100] Regarding the aforementioned technical issue of failing to simultaneously improve brightness uniformity and maintain the continuity of grayscale transitions in the image, further explanation is provided here regarding the discontinuity of grayscale transitions in the image, such as... Figure 7 As shown, the drop in grayscale here is also manifested as a discontinuity in the grayscale transition. Specifically, noticeable black bands can be seen in the areas indicated by the arrows on the left and right sides of the display area. The grayscale division in the area containing the black bands is discontinuous compared to the grayscale division outside the black bands, making the discontinuity in the grayscale transition even more pronounced.

[0101] Figure 8 This is a schematic diagram of grayscale continuity in the image provided in the embodiments of this application. Figure 8 As can be seen, there are obvious black bands on the left and right sides of the display area. Compared with the tomography, the grayscale continuity between the two areas, where the black bands are located and the grayscale division outside the black bands, has been significantly improved.

[0102] Figure 9 This is a comparative diagram of relevant experimental data provided in the embodiments of this application, wherein, Figure 9 The values ​​25, 60, 128, and 240 shown are specific gray levels. X represents the horizontal coordinate of the selected sub-pixel at the corresponding gray level, and Y represents the vertical coordinate of the selected sub-pixel at the corresponding gray level. Figure 9 The first table from top to bottom shows the initial luminance and chromaticity, and the perceptible difference ΔE, which represents the luminance value of the specific sub-pixel for which any compensation is applied. Figure 9 The second table from the top shows the data on brightness and chromaticity after display compensation, as well as the perceptible difference ΔE, which represents the brightness value of a specific sub-pixel after display compensation. Figure 9The third table from the top shows the data on the brightness and color saturation and the perceptible difference ΔE after backlight compensation and display compensation, respectively. This represents the brightness value of a specific sub-pixel after display compensation and backlight compensation. As can be seen from the figure, Figure 9 The perceptible difference ΔE in the first, second, and third tables from top to bottom continuously decreases, indicating that the brightness difference of the corresponding sub-pixels can be minimized after display compensation and backlight compensation.

[0103] The perceptible difference ΔE represents the difference between the displayed color and the original color of the input content. The smaller the value, the more accurate the color and the smaller the corresponding brightness difference; the larger the value, the greater the color difference and the greater the corresponding brightness difference.

[0104] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0105] The display compensation method and liquid crystal display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A display compensation method, characterized in that, include: Obtain the display brightness of the first target and the first actual display brightness of each display zone; A backlight compensation table is determined based on the brightness difference between the first target display brightness and the first display brightness of each display zone; The backlight brightness of the backlight zones is compensated according to the backlight compensation table. Obtain the second target's display brightness and the second actual display brightness of each display zone after compensation by the backlight compensation table; A display compensation table is determined based on the brightness difference between the second target display brightness and the second actual display brightness of each display zone. The display brightness of the display zones is compensated according to the aforementioned display compensation table; The display compensation method further includes: configuring each display partition to include a central display partition and multiple peripheral display partitions; constructing the multiple peripheral display partitions to surround the central display partition; determining the display brightness of the central display partition as the first target display brightness, and the display brightness of the central display partition after compensation by the backlight compensation table as the second target display brightness.

2. The display compensation method according to claim 1, characterized in that, The step of determining the backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display zone includes: Establish a mapping relationship between backlight zones and display zones, where the backlight zones and display zones in the mapping relationship overlap in the direction of backlight emission; Calculate the brightness difference between the first target's display brightness and the first actual display brightness of the display zone; The brightness difference is determined to be the backlight brightness compensation value of the backlight zone corresponding to the display zone; Obtain the backlight brightness compensation values ​​of the backlight zones corresponding to all the display zones from the backlight compensation table.

3. The display compensation method according to claim 2, characterized in that, The calculation is performed to determine the brightness difference between the first target's display brightness and the first actual display brightness of the display zone. The step of determining the brightness difference as the backlight brightness compensation value of the backlight zone corresponding to the display zone further includes: Determine the backlight brightness compensation value for a specific backlight zone; Based on the backlight brightness compensation value of the specific backlight zone, the backlight brightness compensation values ​​of other backlight zones besides the specific backlight zone are obtained by interpolation. The step of obtaining the backlight brightness compensation values ​​of all the backlight zones corresponding to the display zones from the backlight compensation table further includes: The backlight brightness compensation values ​​of the specific backlight zone and the backlight brightness compensation values ​​of the other backlight zones are collected in the backlight compensation table.

4. The display compensation method according to claim 1, characterized in that, The step of determining the backlight compensation table based on the brightness difference between the first target display brightness and the first display brightness of each display zone further includes: Determine the type of grayscale for the frame to be displayed; The corresponding backlight compensation table is called based on the type of grayscale displayed in the frame to be displayed.

5. The display compensation method according to claim 1, characterized in that, After the step of compensating the backlight brightness of the backlight zones according to the backlight compensation table, the method further includes: Smooth the backlight brightness of each backlight zone.

6. The display compensation method according to claim 1, characterized in that, The step of determining the display compensation table based on the brightness difference between the second target display brightness and the second actual display brightness of each display zone includes: Determine the brightness weighting coefficient for each of the peripheral display zones; The target brightness of the corresponding peripheral display zone is obtained based on the second target display brightness, the second actual display brightness, and the brightness weighting coefficient. The difference between the target brightness of the peripheral display zone and the second actual display brightness is determined as the display brightness compensation value of the peripheral display zone; The display brightness compensation values ​​of each peripheral display zone are collected in the display compensation table.

7. The display compensation method according to claim 6, characterized in that, The step of obtaining the target brightness of the corresponding peripheral display zone based on the second target display brightness, the second actual display brightness, and the brightness weighting coefficient includes: The target brightness is obtained according to the formula W=n*center+(1-n)*other; Wherein, center, other, n, and W are the second target display brightness, the second actual display brightness, the brightness weighting coefficient, and the target brightness, respectively.

8. A liquid crystal display device, characterized in that, include: The display driver board includes a storage module for storing the display compensation table in the display compensation method as described in any one of claims 1 to 7. The display panel is connected to the display driver board; A backlight module, wherein the backlight module is used to provide corresponding backlight brightness; A backlight driver board is connected to the backlight module. The backlight driver board includes a compensation unit and a storage unit. The compensation unit is connected to the storage unit. The storage unit is used to store the backlight compensation table in the display compensation method as described in any one of claims 1 to 7. The compensation unit is used to call the backlight compensation table during operation.

9. The liquid crystal display device according to claim 8, characterized in that, The backlight compensation meter is used to reduce the brightness difference of the display panel and improve the screen contrast of the display panel. The display compensation meter is used to reduce the brightness difference of the display panel.

10. The liquid crystal display device according to claim 8, characterized in that, The backlight module includes multiple backlight zones, and the backlight driver board adjusts the backlight brightness of at least one backlight zone according to the backlight compensation table. The display panel includes multiple display zones, and one of the backlight zones provides a corresponding backlight brightness for at least one of the display zones.

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