A display compensation method and device, display device and readable storage medium

Abstract

This invention provides a display compensation method, apparatus, display device, and readable storage medium. The display compensation method, applied to a display panel, includes the following steps: determining a brightness change compensation amount based on a hysteresis parameter of a target pixel in an Nth frame image; determining a target compensation amount based on the brightness change compensation amount and a second deviation compensation amount, wherein the second deviation compensation amount is determined based on second grayscale data of the target pixel in an N+1th frame image; compensating the second grayscale data according to the target compensation amount to generate third grayscale data; and driving the target pixel with the third grayscale data when displaying the N+1th frame image. Embodiments of this invention help reduce ghosting that occurs when display brightness changes.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display compensation method, apparatus, display device, and readable storage medium. Background Technology

[0002] When displaying images, the display panel sequentially inputs the display data of each frame to control it. However, the pixel driving circuit of the display panel itself has a hysteresis characteristic, such as... Figure 1 As shown, when the display brightness changes, especially when the grayscale data switches from high grayscale / low grayscale to intermediate grayscale, the display panel will produce image sticking (IS). Summary of the Invention

[0003] This invention provides a display compensation method, apparatus, display device, and readable storage medium to solve the problem of image retention on the display panel caused by changes in display brightness.

[0004] To solve the above problems, the present invention is implemented as follows:

[0005] In a first aspect, embodiments of the present invention provide a display compensation method applied to a display panel, characterized in that the method includes the following steps:

[0006] The brightness change compensation amount is determined based on the hysteresis parameter of the target pixel in the Nth frame image, where N is a positive integer;

[0007] The target compensation amount is determined based on the brightness change compensation amount and the second deviation compensation amount, wherein the second deviation compensation amount is determined based on the second grayscale data of the target pixel in the N+1 frame image;

[0008] The second grayscale data is compensated according to the target compensation amount to generate the third grayscale data;

[0009] When displaying the N+1th frame image, the target pixel is driven by the third grayscale data.

[0010] In some embodiments, the third grayscale data is located between the first grayscale data and the second grayscale data, wherein the first grayscale data is the grayscale data of the target pixel in the Nth frame image.

[0011] In some embodiments, determining the brightness change compensation amount based on the hysteresis parameter of the target pixel in the Nth frame image includes:

[0012] Obtain the brightness change of the display panel within a unit of time.

[0013] Calculate the current change and / or voltage change corresponding to the brightness change;

[0014] The brightness change compensation amount is determined based on the current change and / or voltage change.

[0015] In some embodiments, determining the target compensation amount based on the brightness change data and the second deviation compensation amount includes:

[0016] If the first deviation compensation amount is greater than the second deviation compensation amount, the sum of the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount;

[0017] If the first deviation compensation amount is less than the second deviation compensation amount, the difference between the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount.

[0018] The first deviation compensation amount is determined based on the first grayscale data.

[0019] In some embodiments, the hysteresis parameter includes the hysteresis parameter of the driving transistor of the pixel driving circuit of the target pixel.

[0020] In some embodiments, the difference between the second grayscale data and the third grayscale data is less than or equal to 5 grayscale levels.

[0021] In some embodiments, the first grayscale data is less than 30 grayscale levels or greater than 200 grayscale levels, and the difference between the first grayscale data and the second grayscale data is greater than 50 grayscale levels.

[0022] Secondly, embodiments of the present invention provide a display compensation device applied to a display panel, the device comprising:

[0023] The brightness change compensation amount determination module is used to determine the brightness change compensation amount based on the hysteresis parameter of the target pixel in the Nth frame image.

[0024] The target compensation amount determination module is used to determine the target compensation amount based on the brightness change compensation amount and the second deviation compensation amount, wherein the second deviation compensation amount is determined based on the second grayscale data of the target pixel in the N+1 frame image;

[0025] The third grayscale data generation module is used to compensate the second grayscale data according to the target compensation amount to generate the third grayscale data.

[0026] A driving module is used to drive the target pixel with the third grayscale data when displaying the N+1th frame image.

[0027] Thirdly, embodiments of the present invention provide a display device configured to perform the display compensation method described in any of the above claims.

[0028] Fourthly, embodiments of the present invention provide a readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the display compensation method as described in any of the preceding claims.

[0029] In this embodiment of the invention, by introducing a brightness change compensation amount determined according to the hysteresis parameter, and compensating the target pixel according to the brightness change compensation amount and the second deviation compensation amount for the second grayscale data, the brightness change caused by hysteresis in the Nth frame image can be reflected in the N+1th frame image, thereby reducing the amount of brightness change, which helps to shorten the response time and reduce or eliminate the afterimage caused by brightness change. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a diagram illustrating the display brightness switching of the display panel;

[0032] Figure 2 This is a flowchart illustrating the display compensation method provided in an embodiment of the present invention;

[0033] Figure 3A This is a schematic diagram of the time and current relationship of a target pixel in one embodiment of the present invention;

[0034] Figure 3B This is an enlarged view of region A in Figure 3;

[0035] Figure 4A This is a schematic diagram of brightness change in one embodiment of the present invention;

[0036] Figure 4B yes Figure 4A Enlarged view of region B in the middle;

[0037] Figure 5A This is a schematic diagram of pixel grayscale switching in related technologies;

[0038] Figure 5B This is a schematic diagram of grayscale switching of a target pixel in one embodiment of the present invention;

[0039] Figure 6A This is a schematic diagram of pixel grayscale switching in related technologies;

[0040] Figure 6B This is another grayscale switching diagram of the target pixel in one embodiment of the present invention;

[0041] Figure 6C This is another grayscale switching diagram of the target pixel in one embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the compensation effect provided in an embodiment of the present invention;

[0043] Figure 8 This is a structural diagram of the display compensation device provided in an embodiment of the present invention. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the embodiments of this invention, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices. Additionally, the use of "and / or" in this application indicates at least one of the connected objects, such as A and / or B and / or C, representing seven possibilities: including A alone, B alone, C alone, and the presence of both A and B, both B and C, both A and C, and the presence of A, B, and C.

[0046] This invention provides a display compensation method.

[0047] The display compensation method in this embodiment is applied to a display panel, which may be a liquid crystal display panel.

[0048] The display panel includes multiple pixels, and each pixel includes a pixel driving circuit. The pixel driving circuit itself can refer to existing pixel driving circuits, for example, it can be a pixel driving circuit of different specifications such as 3T1C (3 transistors and 1 storage capacitor), 5T1C, 7T1C, 8T1C, etc. In implementation, compensation can be performed on a pixel-by-pixel basis or on the entire display panel. In some embodiments, the display panel can also be divided into multiple regions and compensation can be performed on each region.

[0049] like Figure 2 As shown, in one embodiment, the method includes the following steps:

[0050] Step 201: Determine the brightness change compensation amount based on the hysteresis parameter of the target pixel in the Nth frame image.

[0051] It is important to understand that during the display process, bias compensation is required for the display panel to ensure display quality. In this embodiment, the bias compensation data corresponding to the Nth frame (Frame N) is the first bias compensation amount, and the bias compensation data corresponding to the (N+1)th frame (Frame N+1) is the second bias compensation amount. Here, the Nth frame is any frame in the image to be displayed, and the (N+1)th frame is the frame following the Nth frame.

[0052] In this embodiment, the brightness change compensation amount is determined based on the brightness change caused by the hysteresis parameter during the writing of the first grayscale data. More specifically, the hysteresis parameter includes the hysteresis parameter of the driving transistor of the pixel driving circuit of the target pixel.

[0053] like Figure 3A and Figure 3B As shown, where, Figure 3B correspond Figure 3A Area A in the middle Figure 3A Curve 301 represents the change in driving current during the process of switching the display grayscale of the target pixel from grayscale 255 to grayscale 63, and curve 302 represents the change in driving current during the process of switching the display grayscale of the target pixel from grayscale 0 to grayscale 63.

[0054] Depend on Figure 3A and Figure 3B It is known that when driven by AC hysteresis, the hysteresis of the driving transistor (DTFT) will cause a brightness difference in the display panel when switching from high grayscale to medium grayscale and from low grayscale to medium grayscale, resulting in image retention. Specifically, image retention occurs when switching from a black or white screen to a gray screen.

[0055] In some embodiments, the first grayscale data is less than 30 grayscale levels or greater than 200 grayscale levels, and the difference between the first grayscale data and the second grayscale data is greater than 50 grayscale levels. That is, the high grayscale level is greater than 200 grayscale levels, while the low grayscale level is less than 30 grayscale levels, and the difference between the medium grayscale level and the high or low grayscale level is greater than 50 grayscale levels. In this case, the ghosting effect is more obvious. Applying the technical solution of this embodiment helps to significantly reduce the ghosting effect and the duration of the ghosting.

[0056] Figure 3B In the diagram, curve 303 represents the implementation of a compensable decay curve during the transition from low to medium grayscale. The dashed line in curve 303 represents the curve that minimizes the decay by introducing a bias voltage, based on the compensable decay curve. Curve 304 represents the implementation of a compensable decay curve during the transition from high to medium grayscale. The dashed line in curve 304 represents the curve that minimizes the decay by introducing a bias voltage, based on the compensable decay curve. Curve 305 represents the decay time variation curve. In curve 305, the difference between the solid and dashed lines on the horizontal axis represents the time change Δt, and the difference on the vertical axis represents the current change ΔI.

[0057] In one embodiment, step 201 specifically includes:

[0058] Obtain the brightness change of the display panel within a unit of time.

[0059] Calculate the current change and / or voltage change corresponding to the brightness change;

[0060] The brightness change compensation amount is determined based on the current change and / or voltage change.

[0061] like Figure 4A and Figure 4B As shown, Figure 4A This is a diagram illustrating the brightness changes of the display panel. Figure 4B for Figure 4A The enlarged view of region B shows that curves 401 and 402 represent the correspondence between brightness / current and time under different grayscale change states, respectively, and curve 403 represents the decay time change curve.

[0062] In this embodiment, the brightness attenuation can be fitted using the following formula:

[0063]

[0064] In the above formula, L is the brightness that decays over time after grayscale switching, and L1 and L2 are the fitting results of the brightness function at time T in the decay functions of τ1 and τ2, respectively. T The brightness accumulated before time T.

[0065] Figure 4B In this context, 1 frame represents the duration of one frame, and its vertical axis represents the change in brightness ΔL, which corresponds to the change in current or voltage.

[0066] During implementation, based on the change in display brightness within a unit of time, the change in current and / or voltage can be calculated, and the brightness change compensation amount can be further determined.

[0067] Step 202: Determine the target compensation amount based on the brightness change compensation amount and the second deviation compensation amount, wherein the second deviation compensation amount is determined based on the second grayscale data of the target pixel in the N+1 frame image.

[0068] In the technical solution of this embodiment, by introducing a brightness change compensation amount, it can be understood that after the Nth frame image is written to the display panel, the brightness change caused by the decay function of the driving transistor in the display panel is reflected in the N+1 frame DTFT bias, thereby reducing the brightness change.

[0069] Please also refer to Figure 4A and Figure 4B , Figure 4A This is the existing display brightness switching method. Figure 4B The display brightness switching method in this embodiment is determined by... Figure 4A and Figure 4B As can be seen, in the brightness switching method of this embodiment, when switching from grayscale 255 to output grayscale 63, the actual switched grayscale is between grayscale 63 and grayscale 255, for example, it may be grayscale 65. When switching from grayscale 0 to output grayscale 63, the actual switched grayscale is between grayscale 63 and grayscale 0, for example, it may be grayscale 61. This is equivalent to introducing the drift of the threshold voltage of the target pixel's driving transistor for display compensation, which helps reduce the amount of brightness change and thus helps reduce image retention.

[0070] In some embodiments, step 202 includes:

[0071] If the first deviation compensation amount is greater than the second deviation compensation amount, the sum of the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount;

[0072] If the first deviation compensation amount is less than the second deviation compensation amount, the difference between the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount.

[0073] The first deviation compensation amount is determined based on the first grayscale data.

[0074] like Figure 6AAs shown, in the prior art, during grayscale switching, each pixel in each row and column is driven independently, and in practice, compensation is performed directly based on its bias compensation result.

[0075] like Figure 6B As shown, in the technical solution of this embodiment, when switching grayscale, not only the base voltage of the driving transistor is considered, but also the unnecessary current change in the transistor is considered. At the same time, the voltage value corresponding to the change is compensated in the next frame image before being input, so as to improve the afterimage phenomenon.

[0076] like Figure 6C As shown, in this embodiment, when compensating for voltage V3, if the first deviation compensation amount is greater than the second deviation compensation amount, the sum of the second deviation compensation amount and the brightness change compensation amount is used as the target compensation amount; if the first deviation compensation amount is less than the second deviation compensation amount, the difference between the second deviation compensation amount and the brightness change compensation amount is used as the target compensation amount. This can be understood as follows: if the bias voltage of frame N+1 is greater than the bias voltage of frame N, the target compensation amount is obtained by subtracting the brightness change compensation amount from the bias voltage compensation result of frame N+1; if the bias voltage of frame N+1 is less than the bias voltage of frame N, the target compensation amount is obtained by adding the brightness change compensation amount to the bias voltage compensation result of frame N+1.

[0077] Step 203: Compensate the second grayscale data according to the target compensation amount to generate the third grayscale data.

[0078] After determining the target compensation amount, the second grayscale data is compensated according to the target compensation amount. In some embodiments, the third grayscale data is located between the first and second grayscale data, where the first grayscale data is the grayscale data of the target pixel in the Nth frame of the image. In some embodiments, the difference between the second and third grayscale data is less than or equal to 5 grayscale levels.

[0079] Step 204: When displaying the N+1th frame image, drive the target pixel with the third grayscale data.

[0080] After determining the third grayscale data, the target pixel is driven to display the image using the third grayscale data, which can reduce the ghosting effect during image switching.

[0081] like Figure 7 As shown, the upper part represents the grayscale switching effect of the prior art, and the lower part represents the grayscale switching effect of the embodiment of the present invention. It can be seen that, compared with the prior art, the embodiment of the present invention has a smaller brightness change range and a shorter time to stabilize brightness when performing grayscale switching.

[0082] This invention also provides a display compensation device applied to a display panel.

[0083] like Figure 8 As shown, in one embodiment, the display compensation device 800 includes:

[0084] The brightness change compensation amount determination module 801 is used to determine the brightness change compensation amount based on the hysteresis parameter of the target pixel in the Nth frame image.

[0085] The target compensation amount determination module 802 is used to determine the target compensation amount based on the brightness change compensation amount and the second deviation compensation amount, wherein the second deviation compensation amount is determined based on the second grayscale data of the target pixel in the N+1 frame image;

[0086] The third grayscale data generation module 803 is used to compensate the second grayscale data according to the target compensation amount to generate the third grayscale data, wherein the third grayscale data is located between the first grayscale data and the second grayscale data, and the first grayscale data is the grayscale data of the target pixel in the Nth frame image.

[0087] The driving module 804 is used to drive the target pixel with the third grayscale data when displaying the N+1th frame image.

[0088] In some embodiments, the third grayscale data is located between the first grayscale data and the second grayscale data, wherein the first grayscale data is the grayscale data of the target pixel in the Nth frame image.

[0089] In some embodiments, the brightness change compensation amount determination module includes:

[0090] The acquisition submodule is used to acquire the brightness change of the display panel within a unit of time.

[0091] The calculation submodule is used to calculate the current change and / or voltage change corresponding to the brightness change.

[0092] A determination submodule is used to determine the brightness change compensation amount based on the current change and / or voltage change.

[0093] In some embodiments, the target compensation amount determination module is specifically used for:

[0094] If the first deviation compensation amount is greater than the second deviation compensation amount, the sum of the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount;

[0095] If the first deviation compensation amount is less than the second deviation compensation amount, the difference between the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount.

[0096] The first deviation compensation amount is determined based on the first grayscale data.

[0097] In some embodiments, the hysteresis parameter includes the hysteresis parameter of the driving transistor of the pixel driving circuit of the target pixel.

[0098] In some embodiments, the difference between the second grayscale data and the third grayscale data is less than or equal to 5 grayscale levels.

[0099] In some embodiments, the first grayscale data is less than 30 grayscale levels or greater than 200 grayscale levels, and the difference between the first grayscale data and the second grayscale data is greater than 50 grayscale levels.

[0100] The display compensation device 800 of this embodiment can implement all the steps of the above-described display compensation method embodiment and can achieve the same or similar technical effects, which will not be repeated here.

[0101] This invention also provides a display device configured to perform the display compensation method described in any of the above embodiments.

[0102] This invention also provides a readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the display compensation method described in any of the preceding embodiments.

[0103] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A display compensation method, applied to a display panel, characterized in that, The method includes the following steps: The brightness change compensation amount is determined based on the hysteresis parameter of the target pixel in the Nth frame image, where N is a positive integer; The target compensation amount is determined based on the brightness change compensation amount and the second deviation compensation amount, wherein the second deviation compensation amount is determined based on the second grayscale data of the target pixel in the N+1 frame image; The second grayscale data is compensated according to the target compensation amount to generate the third grayscale data; When displaying the N+1th frame image, the target pixel is driven by the third grayscale data; The brightness change compensation amount is determined based on the hysteresis parameter of the target pixel in the Nth frame image, including: Obtain the brightness change of the display panel within a unit of time. Calculate the current change and / or voltage change corresponding to the brightness change; The brightness change compensation amount is determined based on the current change and / or voltage change.

2. The method according to claim 1, characterized in that, The third grayscale data is located between the first grayscale data and the second grayscale data, and the first grayscale data is the grayscale data of the target pixel in the Nth frame image.

3. The method according to claim 2, characterized in that, The target compensation amount is determined based on the brightness change compensation amount and the second deviation compensation amount, including: If the first deviation compensation amount is greater than the second deviation compensation amount, the sum of the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount; If the first deviation compensation amount is less than the second deviation compensation amount, the difference between the second deviation compensation amount and the brightness change compensation amount shall be used as the target compensation amount. The first deviation compensation amount is determined based on the first grayscale data.

4. The method according to claim 2, characterized in that, The hysteresis parameter includes the hysteresis parameter of the driving transistor of the pixel driving circuit of the target pixel.

5. The method according to any one of claims 2 to 4, characterized in that, The difference between the second grayscale data and the third grayscale data is less than or equal to 5 grayscale levels.

6. The method according to any one of claims 2 to 4, characterized in that, The first grayscale data is less than 30 grayscale levels or greater than 200 grayscale levels, and the difference between the first grayscale data and the second grayscale data is greater than 50 grayscale levels.

7. A display compensation device, applied to a display panel, characterized in that, The device includes: The brightness change compensation amount determination module is used to determine the brightness change compensation amount based on the hysteresis parameter of the target pixel in the Nth frame image. The target compensation amount determination module is used to determine the target compensation amount based on the brightness change compensation amount and the second deviation compensation amount, wherein the second deviation compensation amount is determined based on the second grayscale data of the target pixel in the N+1 frame image; The third grayscale data generation module is used to compensate the second grayscale data according to the target compensation amount to generate the third grayscale data. A driving module is used to drive the target pixel with the third grayscale data when displaying the N+1th frame image; The brightness change compensation determination module is specifically used to obtain the brightness change of the display panel within a unit time period; calculate the current change and / or voltage change corresponding to the brightness change; and determine the brightness change compensation amount based on the current change and / or voltage change.

8. A display device, characterized in that, Configured to perform the display compensation method as described in any one of claims 1 to 6.

9. A readable storage medium, characterized in that, The readable storage medium stores a computer program that, when executed by a processor, implements the steps of the display compensation method as described in any one of claims 1 to 6.

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