Display device, backlight driving method, system, equipment and medium

Abstract

The invention discloses a display device, a backlight driving method, system and equipment and a medium, the backlight driving method is applied to the display device, and the display device comprises a display panel and a backlight module which are stacked. The backlight driving method comprises: acquiring a refresh rate of a frame to be displayed of a display panel and a parameter of the display panel (S10); determining a black insertion ratio of the frame to be displayed according to the refresh rate and a parameter of the display panel (S20); and providing a backlight driving signal for the backlight module according to the black frame insertion proportion (S30).

Description

Display apparatus, backlight driving method, system, device, and medium Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application No. 202410653564.9, filed May 22, 2024, and entitled “Backlight Driving Method and Apparatus, Display Apparatus, Electronic Device, and Storage Medium,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to a display apparatus, a backlight driving method, a system, a device, and a medium. BACKGROUND

[0003] With the continuous development of display technology, the requirements of users for display apparatuses are gradually increasing. Dynamic picture response time is a parameter that needs to be concerned. The shorter the dynamic picture response time, the clearer the picture and the less the trailing.

[0004] In related technologies, in order to shorten the dynamic picture response time, the black frame insertion method is usually used to reduce the display time of each frame of picture. However, the black frame insertion is usually the refresh rate of the previous frame signal, and the next frame signal is operated. There is a problem that the backlight signal of the backlight module does not match the refresh rate of the display panel. SUMMARY

[0005] The embodiments of the present disclosure provide a display apparatus, a backlight driving method, a system, a device, and a medium, so that the backlight driving signal matches the refresh rate of the frame to be displayed, and the display effect is improved.

[0006] Other characteristics and advantages of the present disclosure will become apparent from the following detailed description, or will be learned by practice of the present disclosure.

[0007] The first aspect of the embodiments of the present disclosure provides a backlight driving method applied to a display apparatus, the display apparatus including a display panel and a backlight module stacked, the method can include: obtaining a refresh rate of a frame to be displayed of the display panel, and parameters of the display panel; determining a black frame insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel; and providing a backlight driving signal for the backlight module according to the black frame insertion ratio.

[0008] In some embodiments, the parameters of the display panel can include a number of backlight black insertion partitions, a vertical blanking time, and a liquid crystal reaction time; and determining the black insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel can include determining a frame duration of the frame to be displayed according to the refresh rate, determining a minimum black insertion duration of the frame to be displayed according to the number of backlight black insertion partitions, the vertical blanking time, the liquid crystal reaction time, and the frame duration, and determining the black insertion ratio of the frame to be displayed according to the minimum black insertion duration and the frame duration.

[0009] In some embodiments, determining the minimum black insertion duration of the frame to be displayed according to the number of backlight black insertion partitions, the vertical blanking time, the liquid crystal reaction time, and the frame duration can include determining the minimum black insertion duration according to formula (1): T s represents the minimum black insertion duration, T f represents the frame duration, T v represents the vertical blanking time, T r represents the liquid crystal reaction time, and n represents the number of backlight black insertion partitions.

[0010] In some embodiments, determining the black insertion ratio of the frame to be displayed according to the minimum black insertion duration and the frame duration can include determining the black insertion ratio according to formula (2): T s represents the minimum black insertion duration, T f represents the frame duration, X represents the black insertion ratio, T b represents a constant, T b is greater than 0 and less than T f -T s .

[0011] In some embodiments, after determining the black insertion ratio according to the minimum black insertion duration and the frame duration, the method can further include obtaining a maximum dynamic picture response time, and determining a dynamic picture response time of the frame to be displayed according to formula (3): MPRT represents the dynamic picture response time; if the dynamic picture response time is greater than the maximum dynamic picture response time, adjusting the constant T b to correct the black insertion ratio.

[0012] In some embodiments, the display panel can include a plurality of display partitions, the backlight module can include a plurality of backlight partitions, the backlight partitions correspond to the display partitions one by one, and providing the backlight driving signal for the backlight module according to the black insertion ratio can include: providing the backlight driving signal for the backlight partitions according to the black insertion ratio, so that the backlight partitions perform black insertion for the corresponding display partitions according to the black insertion ratio.

[0013] In some embodiments, providing the backlight driving signal for the backlight partitions according to the black insertion ratio, so that the backlight partitions perform black insertion for the corresponding display partitions according to the black insertion ratio can include: providing the backlight driving signal for each of the backlight partitions at different times according to the black insertion ratio within a frame duration, so that at least two of the backlight partitions perform black insertion for the corresponding display partitions at different times according to the black insertion ratio within the frame duration.

[0014] In some embodiments, within a frame duration, the liquid crystal flipping periods of each of the display partitions are different and do not overlap with each other; the plurality of display partitions can include a first display partition and a second display partition, the second display partition being at least one other than the first display partition, the plurality of backlight partitions can include a first backlight partition and a second backlight partition, the first backlight partition corresponding to the first display partition, and the second backlight partition being at least one other than the first backlight partition; and providing the backlight driving signal for the backlight partitions according to the black insertion ratio can include: during the liquid crystal flipping of the first display partition, providing a first backlight driving signal to the first backlight partition and a second backlight driving signal to the second backlight partition according to the black insertion ratio.

[0015] In some embodiments, the first backlight driving signal is used to control the first backlight partition to perform black insertion for the first display partition during the liquid crystal flipping of the first display partition, and the second backlight driving signal is used to control the second backlight partition to provide backlight for the corresponding second display partition during the liquid crystal flipping of the first display partition; within the frame duration, the black insertion durations of the first backlight partition and the second backlight partition satisfy the black insertion ratio.

[0016] In some embodiments, the second backlight partition is one of the plurality of backlight partitions other than the first backlight partition.

[0017] In some embodiments, the second backlight partition is spaced apart from the first backlight partition.

[0018] In some embodiments, the backlight module can include a plurality of light source blocks arranged in an array, and the number of the light source blocks is an integer multiple of the number of the display partitions and / or the number of the backlight partitions.

[0019] In some embodiments, before the backlight module is provided with the backlight driving signal according to the black insertion ratio, the method can further include: determining a backlight frequency multiplication factor of the to-be-displayed frame according to the refresh rate; and the backlight module being provided with the backlight driving signal according to the black insertion ratio and the backlight frequency multiplication factor can include: providing the backlight module with the backlight driving signal according to the black insertion ratio and the backlight frequency multiplication factor.

[0020] In some embodiments, the determining of the backlight frequency multiplication factor of the to-be-displayed frame according to the refresh rate can include: when the refresh rate is less than or equal to a preset refresh rate, determining the backlight frequency multiplication factor of the to-be-displayed frame as m, m being a positive integer greater than or equal to 2, and the preset refresh rate being greater than or equal to a refresh rate of the display panel corresponding to a flicker of the backlight module.

[0021] In some embodiments, the determining of the backlight frequency multiplication factor of the to-be-displayed frame according to the refresh rate can include: obtaining a plurality of preset refresh rate ranges, each of the preset refresh rate ranges corresponding to a frequency multiplication factor, and the frequency multiplication factors corresponding to different preset refresh rate ranges being different; matching the refresh rate with the plurality of preset refresh rate ranges, and taking the frequency multiplication factor corresponding to the matched preset refresh rate range as the backlight frequency multiplication factor of the to-be-displayed frame; and the greater the minimum value of the preset refresh rate range, the smaller the corresponding frequency multiplication factor.

[0022] In some embodiments, before the backlight module is provided with the backlight driving signal according to the black insertion ratio and the backlight frequency multiplication factor, the method can further include: determining a frame duration of the to-be-displayed frame according to the refresh rate; determining a backlight sub-frame black insertion time of the to-be-displayed frame according to the frame duration, the black insertion ratio, and the backlight frequency multiplication factor; and the backlight module being provided with the backlight driving signal according to the black insertion ratio and the backlight frequency multiplication factor can include: providing the backlight module with the backlight driving signal according to the backlight sub-frame black insertion time and the backlight frequency multiplication factor.

[0023] In some embodiments, the determining of the backlight sub-frame black insertion time of the to-be-displayed frame according to the frame duration, the black insertion ratio, and the backlight frequency multiplication factor can include: determining the backlight sub-frame black insertion time according to formula (4) as follows: m formula (4); Y represents the backlight sub-frame black insertion time, m represents the backlight frequency multiplication factor, T f represents the frame duration, and X represents the black insertion ratio.

[0024] In some embodiments, before the step of providing the backlight driving signal for the backlight module according to the black frame insertion ratio, the method can further include: determining a current compensation multiple of the frame to be displayed according to the black frame insertion ratio; and the step of providing the backlight driving signal for the backlight module according to the black frame insertion ratio can include: providing the backlight driving signal for the backlight module according to the black frame insertion ratio and the current compensation multiple.

[0025] In some embodiments, the step of determining the current compensation multiple of the frame to be displayed according to the black frame insertion ratio can include: determining the current compensation multiple according to formula (5) as follows: A represents the current compensation multiple, and A is less than or equal to a maximum current compensation multiple, and X represents the black frame insertion ratio.

[0026] In some embodiments, the black frame insertion ratio ranges from 75% to 90%.

[0027] In some embodiments, after the step of obtaining the refresh rate of the frame to be displayed of the display panel, the method can further include: when the refresh rate is less than or equal to a preset refresh rate, providing a target driving signal for the backlight module, and not performing the step of determining the black frame insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel; the preset refresh rate is greater than or equal to a refresh rate of the display panel corresponding to a flicker of the backlight module, and the target driving signal is used to control the backlight module to pulse dim and / or direct current dim the display panel.

[0028] A second aspect of the embodiments of the present disclosure provides a backlight driving system applied to a display device, the display device can include a display panel and a backlight module stacked, and the system can include: a first processor and a second processor in communication with each other, the first processor is configured to be arranged in the display panel, and the second processor is configured to be arranged in the second processor; the first processor is configured to send a refresh rate of a frame to be displayed of the display panel to the second processor; the second processor is configured to obtain the refresh rate and parameters of the display panel, determine a black frame insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel, and provide a backlight driving signal for the backlight module according to the black frame insertion ratio.

[0029] A third aspect of the embodiments of the present disclosure provides a display device, which can include: a display panel and a backlight module stacked with each other, and a backlight driving system as described in the second aspect.

[0030] In a fourth aspect, an electronic device is provided, which can include a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, implements the backlight driving method of any one of the first aspect.

[0031] In a fifth aspect, a non-transitory computer-readable storage medium is provided, which stores a computer program, and the computer program, when executed by a processor, implements the backlight driving method of any one of the first aspect.

[0032] It should be understood that the general description above and the detailed description below are only exemplary and explanatory, and are not limiting of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure. It is readily apparent to one of ordinary skill in the art that the accompanying drawings only illustrate some embodiments of the present disclosure, and other drawings can be obtained by one of ordinary skill in the art without creative effort based on the accompanying drawings. In the drawings:

[0034] FIG. 1 shows a flowchart of a backlight driving method according to some embodiments of the present disclosure;

[0035] FIG. 2 shows a detailed flowchart of step S20 of FIG. 1;

[0036] FIG. 3 shows a black insertion schematic diagram of display partitions and backlight partitions according to some embodiments of the present disclosure;

[0037] FIG. 4 shows a flowchart of a backlight driving method according to some other embodiments of the present disclosure;

[0038] FIG. 5 shows a detailed flowchart of step S30A according to some embodiments of the present disclosure;

[0039] FIG. 6 shows a flowchart of a backlight driving method according to some other embodiments of the present disclosure;

[0040] FIG. 7 shows a flowchart of a backlight driving method according to some other embodiments of the present disclosure;

[0041] FIG. 8 shows a structural block diagram of a backlight driving system according to some embodiments of the present disclosure;

[0042] FIG. 9 shows a signal transmission schematic diagram according to some embodiments of the present disclosure;

[0043] FIG. 10 shows a signal black insertion schematic diagram according to some embodiments of the present disclosure;

[0044] FIG. 11 shows another signal black insertion schematic diagram according to some embodiments of the present disclosure;

[0045] FIG. 12 shows another signal insertion black diagram in the embodiments of the present disclosure;

[0046] FIG. 13 shows a structural block diagram of a display device according to some embodiments of the present disclosure;

[0047] FIG. 14 shows a structural block diagram of an electronic device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0048] The specific embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to explain and illustrate the present disclosure, and are not intended to limit the present disclosure.

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present disclosure.

[0050] Unless otherwise defined, technical terms or scientific terms used in the embodiments of the present disclosure shall have the ordinary meaning understood by those skilled in the art to which the present disclosure pertains. The terms “first”, “second”, and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, the terms “include”, “contain”, and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms “connect” or “connected” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper”, “lower”, “left”, “right”, and the like only represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0051] As used herein, "parallel," "perpendicular" include the recited condition and conditions approximating the recited condition to the extent that is within an acceptable deviation range, in some embodiments as determined by one of ordinary skill in the art taking into account the measurement at issue and the error associated with a particular measurement (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and near parallel, in some embodiments the acceptable deviation range for near parallel can be, for example, within 5°; "perpendicular" includes absolute perpendicular and near perpendicular, in some embodiments the acceptable deviation range for near perpendicular can also be, for example, within 5°.

[0052] It will be understood that when a layer or element is referred to as being "on" another layer or substrate, it can be directly on the other layer or substrate, or intervening layers can also be present. Exemplary embodiments are described herein with reference to cross-sectional and / or plan view illustrations that are idealized examples. In the drawings, the thickness of layers and regions are exaggerated for clarity. Accordingly, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. The regions illustrated in the drawings are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

[0053] With the continuous development of display technology, the requirements of users for display devices are gradually increasing. Moving Picture Response Time (MPRT) is a parameter that needs to be concerned. The shorter the Moving Picture Response Time is, the clearer the picture is, and the less the ghosting is.

[0054] Moving Picture Response Time refers to the time a pixel remains visible in a display. It can be used to reduce the ghosting and afterimage phenomenon of a picture, making the picture clearer and smoother, thereby improving user experience and comfort. Generally, MPRT is the time a frame is displayed on the screen by temporarily turning off the backlight during the color conversion process. When the color conversion is completed, the backlight is turned on again to continue displaying the next frame. This processing effectively reduces the persistence effect of the picture, i.e., the phenomenon that the previous frame is still visible when the next frame is displayed, thereby reducing the visual blur. MPRT combines GTG (Gray to Gray) and the holding time of each frame, so that the calculated MPRT can better reflect the ghosting perceived by the human eye. The calculation principle of MPRT is described below by formula:

[0055]

[0056] In some embodiments, τ represents the liquid crystal response time (or gray scale response time), T f represents the frame duration, DR represents the ratio of the decay time and the frame duration.

[0057] According to the above formula, to reduce the MPRT and improve the display effect, the display time in the frame duration can be reduced or the gray scale response time can be reduced. Taking the reduction of the display time in the frame duration as an example, the display time in the frame duration can be reduced by inserting a black frame, that is, the display is black for a period of time.

[0058] Variable refresh rate (VRR) is a display technology that allows the refresh rate of the display to be dynamically adjusted to match the frame rate output by the graphics card. Traditional displays usually have a fixed refresh rate (such as 60Hz, 75Hz, etc.), which means that the display refreshes a fixed number of times per second. However, in actual use, the frame rate output by the graphics card varies, especially when playing games or running high-performance applications. This mismatch can cause screen tearing and stuttering, etc. VRR technology dynamically adjusts the refresh rate to synchronize the refresh rate of the display with the frame rate output by the graphics card, eliminating screen tearing and stuttering, and improving the visual experience.

[0059] From the foregoing, it can be seen that when the variable refresh rate function of the display is turned on, the refresh rate of the display is in a dynamic change process, for example, the refresh rate of the previous second can be 240Hz, and the refresh rate of the next second can change to 60Hz. On this basis, if an effective backlight driving signal (such as effective black insertion) can be provided for the display in the process of dynamic change of the refresh rate, the MPRT can be effectively reduced and the display effect can be improved.

[0060] In the related art, in order to shorten the dynamic picture response time, the black frame insertion method is usually used to reduce the display time of each frame of picture. However, the black frame insertion is usually the refresh rate of the previous frame signal, and the next frame signal is operated, for example, the backlight is provided for the next frame according to the refresh rate information of the current frame of the display panel, which causes the mismatch between the provided backlight of the next frame and the refresh rate of the next frame of the liquid crystal panel, and the difference between them is always one frame of time. For example, the refresh rate of the current frame of the display panel is 60HZ, and the refresh rate of the next frame is 120HZ. The related art uses the refresh rate of 60HZ to obtain the backlight signal provided by the backlight module of the next frame, for example, the refresh rate of the backlight signal is obtained according to the refresh rate of 60HZ of the liquid crystal panel, thereby causing the mismatch between the refresh rate of the backlight provided by the backlight module of the next frame and the refresh rate of 120HZ of the liquid crystal panel, and resulting in poor display effect.

[0061] Therefore, the first aspect of the embodiments of the present disclosure provides a backlight driving method, which can match the backlight driving signal with the refresh rate of the frame to be displayed to some extent, and improve the display effect.

[0062] The backlight driving method of the embodiments of the present disclosure will be described below in combination with specific drawings.

[0063] Referring to FIG. 1, a flowchart of a backlight driving method according to some embodiments of the present disclosure is shown.

[0064] The first aspect of the embodiments of the present disclosure provides a backlight driving method applied to a display device, wherein the display device comprises a display panel and a backlight module stacked.

[0065] It can be understood that the display device as a display component of an electronic device has been widely applied to various electronic products. For example, the display device can be a display screen, a mobile phone, a notebook computer, a tablet computer, a wearable display device (such as a smart watch, smart glasses, etc.), a television, a digital photo frame, or any electronic product or component with display function.

[0066] According to different display principles, the display panel can be an organic light emitting diode (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, a micro light emitting diode (Mini-LED or Micro-LED) display panel, or a liquid crystal panel (LCD). The following will be described taking the liquid crystal panel as an example.

[0067] Exemplarily, the backlight module includes a backlight source, and the type of the backlight source can be an LED (Light Emitting Diode), a Mini-LED, a QLED (Quantum Dot Light Emitting Diodes), or the like. In the present embodiment, the LED is taken as an example for illustration without any limitation.

[0068] The backlight driving method of the present embodiment can be executed in a controller of the backlight module, for example, a backlight MCU (Microcontroller Unit). The method includes but is not limited to the following steps.

[0069] Step S10. Obtain the refresh rate of the to-be-displayed frame of the display panel and the parameter of the display panel.

[0070] It should be noted that the to-be-displayed frame can be the frame picture to be displayed by the display panel next time. Exemplarily, the display panel is provided with a processor (for example, a Scaler IC, a Tcon IC, or the like), and the processor sends the refresh rate of the to-be-displayed frame of the display panel to the backlight MCU. Thus, the backlight MCU can perform subsequent analysis and processing according to the refresh rate of the to-be-displayed frame, which will be described below.

[0071] It can be understood that generally, after receiving the image information, the processor determines the brightness data of the to-be-displayed frame according to the image information and sends the brightness data to the backlight MCU, so that the backlight MCU controls the backlight module to provide backlight with a corresponding brightness according to the brightness data. That is, in the present embodiment, the processor can send the brightness data and the refresh rate of the to-be-displayed frame to the backlight MCU.

[0072] It should be noted that the parameter of the display panel can be a parameter related to the dynamic response time, that is, a parameter affecting the dynamic response time, or a parameter affecting the black frame insertion, for example, a black frame insertion ratio, a black frame insertion time, or the like, such as a liquid crystal reaction time (gray scale response time), a vertical blanking time, or the like.

[0073] In some embodiments, the parameter of the display panel includes the number of backlight black frame insertion partitions, the vertical blanking time, and the liquid crystal reaction time.

[0074] It should be noted that the backlight module includes a plurality of light source blocks arranged in an array, each light source block includes at least one LED lamp, and thus each light source block constitutes a lamp area. In order to improve the display effect and realize fine or delicate control of each sub-region of the display area of the display panel, each lamp area of the backlight module can be controlled or driven individually. Exemplarily, the backlight module includes 1152 lamp areas, 2304 lamp areas, or the like.

[0075] When the backlight module provides backlight or black insertion for the display panel, in order to improve the display effect, the display panel and the backlight module can also be divided into partitions, for example, according to the width direction of the display panel (or the pixel row direction in the display panel), the display panel is divided into a plurality of display partitions, and the backlight module is divided into a plurality of backlight partitions, one display partition can correspond to one backlight partition, and each backlight partition is used to provide backlight or perform black insertion for the corresponding display partition. For example, the number of display partitions and backlight partitions is 4, 5, 6, 7, 8, 9, 10, etc., which can be set according to actual needs, for example, the number of display partitions and backlight partitions can be determined by the number of lamp areas (light source blocks), for example, the number of lamp areas is an integer multiple of the number of display partitions and the number of backlight partitions, so as to facilitate calculation, that is, one backlight partition can include a plurality of lamp areas.

[0076] Therefore, the driving current of the LED in each backlight partition can be adjusted according to the pixel information (such as the gray value) of the frame to be displayed on the display panel, so as to realize independent adjustment of the brightness of each backlight partition in the backlight module. The backlight module is driven by the backlight area adjustment technology, which not only can reduce the power consumption of the display panel, but also can realize dynamic dimming of the backlight module. For high-brightness picture area, the brightness of the corresponding backlight partition can be increased, and for dark picture area, the brightness of the corresponding backlight partition can be reduced, or the backlight can be turned off (black insertion), so as to improve the contrast of the display image and improve the display effect of the display panel.

[0077] Based on the above introduction, it can be known that the number of backlight black insertion partitions in the embodiment of the present disclosure can be the number of backlight partitions or the number of display partitions. That is, in the embodiment of the present disclosure, the number of backlight black insertions, the number of backlight partitions and the number of display partitions are consistent.

[0078] It can be understood that each frame of picture of the display panel can include a plurality of basic pixels, each pixel can have independent color information, and the pixels are displayed by being scanned line by line by an electron gun. On this basis, the vertical blanking time of the embodiment of the present disclosure can be the time when the electron gun returns to the corner (for example, the upper left corner) of the display screen after drawing all the scanning lines to prepare for the next screen (frame) drawing.

[0079] The liquid crystal response time of the embodiment of the present disclosure can refer to the gray scale response time, that is, the time for a pixel in the display panel to switch from one gray value (that is, a certain brightness) to another gray value.

[0080] Step S20. According to the refresh rate and the parameters of the display panel, the black insertion ratio of the frame to be displayed is determined.

[0081] It should be noted that the black insertion ratio can be: the ratio between the black insertion time length and the frame time length in the frame time length (the holding time length of each frame of picture, which is the sum of the display time length and the black insertion time length). For example: 1 frame time length is 10ms, and the black insertion time length is 5ms, and the black insertion ratio is 0.5; for another example: 1 frame time length is 16ms, and the black insertion time length is 12ms, and the black insertion ratio is 0.75.

[0082] In some embodiments, the black insertion ratio is in the range of 75%-90%, for example, 75%, 78%, 80%, 85%, 88%, 90%, etc.

[0083] Referring to FIG. 2, a detailed flowchart of step S20 of FIG. 1 is shown.

[0084] In some embodiments, the black insertion ratio is in the range of 75%-90%, for example, 75%, 78%, 80%, 85%, 88%, 90%, etc.

[0085] Step S21. Determine the frame time length of the to-be-displayed frame according to the refresh rate;

[0086] It can be understood that the frame time length can be the inverse of the refresh rate. For example, the refresh rate of the to-be-displayed frame is 60HZ, and the frame time length of the to-be-displayed frame is 16.67ms. For another example, the refresh rate of the to-be-displayed frame is 100Hz, and the frame time length of the to-be-displayed frame is 10ms.

[0087] Step S22. Determine the minimum black insertion time length of the to-be-displayed frame according to the number of backlight black insertion partitions, the vertical blanking time, the liquid crystal reaction time, and the frame time length;

[0088] It can be understood that when the display panel is in a variable refresh rate (VRR), although the refresh rate is in a dynamic change process, the refresh rate is always within a preset refresh rate range, i.e., between a maximum refresh rate (e.g., 240Hz, 300Hz, etc.) and a minimum refresh rate (e.g., 60Hz, 48Hz, etc.). In order to ensure that the display panel still has a good display effect, the minimum black insertion time length needs to be determined, i.e., the black insertion time length of the backlight module for a frame of picture at least needs to meet the minimum black insertion time length.

[0089] In some embodiments, the minimum black insertion time length of the to-be-displayed frame is determined according to the number of backlight black insertion partitions, the vertical blanking time, the liquid crystal reaction time, and the frame time length, including:

[0090] The minimum black insertion time length is determined according to formula (1):

[0091]

[0092] In some embodiments, Ts T represents the minimum black insertion duration. f T represents the frame duration. v T represents the vertical blanking time. r The value represents the liquid crystal response time, and n represents the number of backlight black insertion zones.

[0093] As can be seen from formula (1), in the same display device, the number of backlight black insertion zones, the vertical blanking time, and the liquid crystal response time are all fixed values. Therefore, the minimum black insertion time of the frame to be displayed can be determined by the frame duration of the frame to be displayed.

[0094] Step S23. Determine the black insertion ratio of the frame to be displayed based on the minimum black insertion duration and the frame duration.

[0095] In some embodiments, determining the black insertion ratio of the frame to be displayed based on the minimum black insertion duration and the frame duration includes:

[0096] The insertion ratio is determined according to formula (2):

[0097]

[0098] In some implementations, T s T represents the minimum black insertion duration. f X represents the frame duration, X represents the black insertion ratio, and T represents the black insertion ratio. b T represents a constant. b Greater than 0 and less than T f -T s .

[0099] It should be noted that T s +T b This represents the total black insertion duration of the frames to be displayed. It's understandable that a larger total black insertion duration means a larger black insertion ratio, resulting in shorter display time within the frame duration. This leads to shorter dynamic image response time, clearer images, less ghosting, and better display quality. However, excessively long black insertion durations can also negatively impact display quality. Therefore, the constant T needs to be adjusted. b It is limited to a certain range.

[0100] In some embodiments, after determining the black insertion ratio based on the minimum black insertion duration and the frame duration, the method further includes:

[0101] Step S24. Obtain the maximum response time of the dynamic image;

[0102] For example, the maximum dynamic picture response time is 1 ms, that is, the dynamic picture response time less than 1 ms has excellent display effect. In some other embodiments, the maximum dynamic picture response time can be other values, for example, 3 ms, 5 ms, etc., which can be designed according to the specific use requirements of the display device, and is not limited here.

[0103] Step S25. Determine the dynamic picture response time of the frame to be displayed according to formula (3):

[0104]

[0105] In some embodiments, MPRT represents the dynamic picture response time;

[0106] It can be understood that the constant T b is a known preset value.

[0107] Step S26. If the dynamic picture response time is greater than the maximum dynamic picture response time, adjust the constant T b to correct the black insertion ratio.

[0108] It can be understood that if the dynamic picture response time is greater than the maximum dynamic picture response time, it means that the currently calculated dynamic picture response time cannot have good display effect. On the basis that the minimum black insertion duration and the frame duration are determined, the size of the black insertion ratio is related to the constant T b . In order to simplify the calculation, the black insertion ratio can be corrected by adjusting the constant T b until the dynamic picture response time of the frame to be displayed is less than the maximum dynamic picture response time. If the dynamic picture response time of the frame to be displayed is less than the maximum dynamic picture response time, the constant T b can remain as a preset value.

[0109] In some embodiments, the black insertion ratio of each frame in the display device is the same, that is, the black insertion ratio can be a fixed value. Only need to ensure that the dynamic picture response time is less than the maximum dynamic picture response time under the fixed value of multiple refresh rates to ensure the display effect of the display device. When the black insertion ratio in the display device is a fixed value, the black insertion ratio can still be determined by formula (1) to formula (3), only need to ensure that the dynamic picture response time corresponding to the maximum refresh rate and the minimum refresh rate of the display device is less than the maximum dynamic picture response time.

[0110] Step S30. Provide a backlight driving signal for the backlight module according to the black insertion ratio.

[0111] It can be understood that, on the basis of determining the black insertion ratio, the backlight MCU can determine the time length of black insertion for the frame to be displayed in a frame of the display panel according to the black insertion ratio, so as to determine the on time and off time of the LED in each backlight partition. That is, the backlight driving signal can be the on time signal and off time signal of the LED in the backlight partition.

[0112] Referring to FIG. 3, a structure schematic diagram of display partitions and backlight partitions of an embodiment of the present disclosure is shown.

[0113] In some embodiments, the display panel includes a plurality of display partitions 1, and the backlight module includes a plurality of backlight partitions 2, which correspond to the display partitions 1 one by one.

[0114] It should be noted that the black area in FIG. 3 represents that the backlight partition 2 performs black insertion on the display partition 1, and the white area represents that the backlight partition 2 provides backlight for the display partition 1.

[0115] For example, the backlight driving signal provided for the backlight module according to the black insertion ratio includes:

[0116] Step S31. The backlight driving signal is provided for the backlight partition according to the black insertion ratio, so that the backlight partition performs black insertion on the corresponding display partition according to the black insertion ratio.

[0117] It can be understood that, in order to improve the display effect, each backlight partition of the embodiment of the present disclosure can perform black insertion on the corresponding display partition according to the black insertion ratio respectively. Then, in the display time length of a frame, different backlight partitions can be controlled to perform black insertion and provide backlight according to the different light and dark requirements of different regions of the frame.

[0118] In some embodiments, the backlight driving signal is provided for the backlight partition according to the black insertion ratio, so that the backlight partition performs black insertion on the corresponding display partition according to the black insertion ratio, including:

[0119] In a frame time length, the backlight driving signal is provided for each backlight partition according to the black insertion ratio at different times, so that at least two backlight partitions perform black insertion on the corresponding display partition according to the black insertion ratio at different times in the frame time length, for example, each backlight partition performs black insertion on the corresponding display partition according to the black insertion ratio at different times.

[0120] It should be noted that the backlight driving signal provided by the backlight MCU for each backlight partition at different times according to the black insertion ratio can be a black insertion driving signal. That is, although at least two backlight partitions do not perform black insertion at different times, the black insertion time length of each backlight partition still satisfies the black insertion ratio within one frame time. For example, if the black insertion ratio is 0.8, within a frame time of 10 ms, backlight partition A performs black insertion from the 1st ms to the 8th ms, backlight partition B performs black insertion from the 2nd ms to the 9th ms, and backlight partition C performs black insertion from the 3rd ms to the 10th ms.

[0121] It can be understood that the backlight MCU provides a black insertion driving signal for each backlight partition at different times, which can be realized by the backlight MCU providing different signal forms to each backlight partition. For example, the backlight partitions include backlight partition A, backlight partition B, and backlight partition C, and the frame time is 10 ms. Within the first 1 / 4 frame time, the signal form provided to backlight partition A is "1", and the signal forms provided to backlight partitions B and C are "0". In some embodiments, 1 represents providing backlight, and 0 represents performing black insertion. Thus, the black insertion time periods of the backlight partitions are staggered, and at least part of the screen of the display panel is always in a bright screen state, thereby keeping the display screen from being completely black, and thereby avoiding affecting the user experience.

[0122] In some embodiments, within one frame time, the liquid crystal flipping time periods of the display partitions are different and do not overlap.

[0123] It should be noted that the liquid crystal flipping in the display panel is performed row by row from the top left corner to the bottom right corner of the screen. It takes 1 frame time to flip from the first row to the last row. As known from the foregoing, the display panel is divided into multiple display partitions in the row direction in the embodiments of the present disclosure. Since the liquid crystal flipping is performed row by row, within one frame time, the liquid crystal flipping time periods of the display partitions are different and do not overlap. For example, the frame time is 16 ms, and there are 4 display partitions. The first display partition flips from the 1st ms to the 4th ms, the second display partition flips from the 5th ms to the 8th ms, the third display partition flips from the 9th ms to the 12th ms, and the fourth display partition flips from the 13th ms to the 16th ms.

[0124] In some embodiments, the multiple display partitions include a first display partition and a second display partition, the second display partition being at least one other than the first display partition, and the multiple backlight partitions include a first backlight partition and a second backlight partition, the first backlight partition corresponding to the first display partition, and the second backlight partition being at least one other than the first backlight partition.

[0125] For example, in FIG. 3, there are 4 display partitions and 4 backlight partitions in the direction from top to bottom, the first display partition is taken as the first display partition, and at least one of the second to fourth display partitions is taken as the second display partition; the first backlight partition is taken as the first backlight partition, and at least one of the second to fourth backlight partitions is taken as the second backlight partition.

[0126] For example, the method further includes:

[0127] In the liquid crystal flipping process of the first display partition, the first backlight driving signal is provided to the first backlight partition according to the black insertion ratio, and the second backlight driving signal is provided to the second backlight partition; in some embodiments, the first backlight driving signal is used to control the first backlight partition to perform black insertion for the first display partition in the liquid crystal flipping process of the first display partition; the second backlight driving signal is used to control the second backlight partition to provide backlight for the corresponding second display partition in the liquid crystal flipping process of the first display partition; and the black insertion time length of the first backlight partition and the second backlight partition in the frame time length satisfies the black insertion ratio.

[0128] It can be understood that MPRT is used to improve trailing, and the reason for the existence of trailing is that: assuming that a video is divided into a static image, 60Hz is to display 60 static images in one second, and the object in the image changes 60 times in one second when moving at high speed, and the liquid crystal of the display panel also flips 60 times correspondingly; if the backlight module provides backlight in the liquid crystal flipping process, that is, the backlight exists in brightness, the backlight will be mapped to the eyeball of the user through the display panel, thereby causing the problem of dynamic blur.

[0129] Therefore, in order to eliminate dynamic blur and achieve better display effect, in the liquid crystal flipping process of the first display partition, the backlight of the corresponding first backlight partition is controlled to remain off, that is, black insertion is performed, and the second backlight partition is controlled to provide backlight, the second backlight partition being at least one of the backlight partitions other than the first backlight partition, that is, at least one of the other backlight partitions provides backlight for the display partition when the first backlight partition performs black insertion, so that at least part of the display partitions in the display screen maintain brightness, thereby avoiding black screen and affecting user experience.

[0130] It can be understood that when black insertion is performed in the first backlight sub-area, the more the number of the second backlight sub-area providing backlight, the greater the backlight brightness that can be provided for the whole display panel. Different numbers of the second backlight sub-area providing backlight result in different brightness losses. Therefore, the current of the LED in the backlight sub-area can be different when the number of the second backlight sub-area is different. For example, the more the number of the second backlight sub-area, the smaller the current in each second backlight sub-area can be. The current can be adjusted as required, which is not limited herein.

[0131] It can be understood that, as shown in FIG. 3, when the display sub-area is 4, the liquid crystal flipping duration of the first display sub-area is 1 / 4 of the frame duration, and the black insertion time of the first backlight sub-area during the duration corresponds to the liquid crystal flipping duration, which is also 1 / 4 of the frame duration. Assuming that the black insertion ratio is 3 / 4 of the frame duration, then in one frame duration, the first backlight sub-area needs to perform black insertion for another 2 / 4 frame duration in addition to the black insertion during the liquid crystal flipping duration of the first display sub-area, to meet the black insertion ratio.

[0132] In some embodiments, the second backlight sub-area is one of the plurality of backlight sub-areas except the first backlight sub-area.

[0133] It can be understood that when the second backlight sub-area provides backlight, the backlight in the second backlight sub-area diffuses outward, and the more the number of the second backlight sub-area, the greater the range of outward diffusion, which can diffuse to the first backlight sub-area. Therefore, during the liquid crystal flipping process of the first display sub-area, the backlight transmits from the first display sub-area and is mapped to the eyeball of a person, thereby causing a certain degree of dynamic blur. Therefore, in order to improve the display effect, the second backlight sub-area is set to one in the embodiments of the present disclosure, thereby reducing the influence on the first display sub-area. In order to prevent the backlight provided by the second backlight sub-area from diffusing to the first backlight sub-area, the second backlight sub-area and the first backlight sub-area are spaced from each other, that is, at least one backlight sub-area is spaced between the second backlight sub-area and the first backlight sub-area.

[0134] For example, one frame of picture of the display panel is divided into n display sub-areas (n is an integer >= 4), and the backlight scanning scheme corresponds to n-1, as follows:

[0135] Backlight scanning scheme 1: when the liquid crystal flips the i-th display sub-area (i<=n), the i+1-th backlight sub-area is turned on; when i+1>n, the i+1-n-th backlight sub-area is turned on.

[0136] Backlight scanning scheme 2: when the liquid crystal flips the i-th display sub-area (i<=n), the i+2-th backlight sub-area is turned on; when i+2>n, the i+2-n-th backlight sub-area is turned on.

[0137] Backlight scanning scheme 3: when the liquid crystal flips to the ith display partition (i<=n), the (i+3)th backlight partition is lit up; when i+3>n, the (i+3-n)th backlight partition is lit up.

[0138] For example: when n=4, when the liquid crystal flips to the 1st display partition, the 3rd backlight partition is lit up; when the liquid crystal flips to the 2nd display partition, the 4th backlight partition is lit up; when the liquid crystal flips to the 3rd display partition, the 1st backlight partition is lit up; when the liquid crystal flips to the 4th display partition, the 2nd backlight partition is lit up.

[0139] In order to understand the corresponding different second backlight partition lighting schemes in the liquid crystal flipping of the first display partition in the embodiments of the present disclosure, the following exemplary illustrates each scheme in the form of a table. In Table 1, B11-B16 refer to each first display partition, and B21-B16 refer to each second display partition.

[0140] Table 1: second backlight partition lighting scheme table

[0141]

[0142] Therefore, through the foregoing introduction, the embodiments of the present disclosure determine the black insertion ratio of the to-be-displayed frame by the refresh rate of the to-be-displayed frame and the parameters of the display panel, that is, according to the refresh rate of the next frame of picture to be displayed by the display panel, a backlight driving signal, such as a black insertion time length and a backlight providing time length signal, is provided for the backlight module, so that the backlight driving signal matches the refresh rate of the to-be-displayed frame, for example, the black insertion ratio matches the refresh rate of the to-be-displayed frame, or the refresh rate of the backlight driving signal matches the refresh rate of the to-be-displayed frame, thereby improving the display effect. In some embodiments, the refresh rate of the backlight driving signal matches the refresh rate of the to-be-displayed frame, which can be that the refresh rate of the backlight driving signal is consistent with the refresh rate of the to-be-displayed frame, or the refresh rate of the backlight driving signal is an integral multiple of the refresh rate of the to-be-displayed frame. In addition, the embodiments of the present disclosure stagger the black insertion time period of each backlight partition, so that at least part of the area of the display panel is always in a bright screen state, thereby keeping the display screen from being completely black, and avoiding affecting the user experience. In some embodiments, in order to eliminate dynamic blur and achieve better display effect. In the liquid crystal flipping process of the first display partition, the backlight of the corresponding first backlight partition is controlled to remain off, that is, black insertion, and the second backlight partition is controlled to provide backlight, the second backlight partition being at least one other than the first backlight partition, that is, at least one of the other backlight partitions provides backlight for the display partition when the first backlight partition is black inserted, so that at least part of the display partition of the display screen maintains brightness, avoiding black screen and affecting the user experience.

[0143] Based on the foregoing introduction, it can be known that the display time of each frame picture is reduced, i.e., the MPRT time is reduced, and the problem of dynamic blur is overcome by the method of inserting black frames. However, in the process of dynamic change of the refresh rate of the display panel, the refresh rate cannot be avoided to be at a lower refresh rate, for example, below 90 Hz. If the MPRT function of the display panel is turned on, i.e., the screen is controlled to be bright for a period of time and dark for a period of time by PWM (Pulse-Width Modulation) dimming, backlight flicker will occur at low frequency, for example, backlight flicker will occur when the frequency is below 90 Hz. In view of this, how to solve the problem of backlight flicker on the basis of variable refresh rate and MPRT is described below.

[0144] In some embodiments, after the refresh rate of the display panel is acquired, the method further comprises:

[0145] When the refresh rate is less than or equal to a preset refresh rate, a target driving signal is provided to the backlight module, and the step of determining the black insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel is not performed. In some embodiments, the preset refresh rate is greater than or equal to the refresh rate of the display panel corresponding to the flicker of the backlight module. The target driving signal is used to control the backlight module to pulse (PWM) dim and / or direct current (DC) dim the display panel.

[0146] For example, the refresh rate of the display panel corresponding to the flicker of the backlight module is 80 Hz, 90 Hz, etc. The preset refresh rate can be set to be slightly greater than the refresh rate corresponding to the flicker of the backlight module, for example, 100 Hz, to ensure that when the refresh rate is greater than the preset refresh rate, the problem of backlight flicker does not occur.

[0147] Therefore, after the backlight MCU of the display panel receives the refresh rate of the frame to be displayed, if the refresh rate is less than or equal to the preset refresh rate, the backlight MCU no longer controls the backlight module to insert black for the frame to be displayed, and pulse (PWM) dimming and / or direct current (DC) dimming is used at low frequency, thereby overcoming the problem of backlight flicker.

[0148] Referring to FIG. 4, a flowchart of a backlight driving method according to some embodiments of the present disclosure is shown.

[0149] In some embodiments, before the backlight driving signal is provided to the backlight module according to the black insertion ratio, the method further comprises:

[0150] Step S30A. Determine the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate;

[0151] It should be noted that the backlight frequency multiplication factor refers to the number of times the backlight in the backlight partition is turned on within a frame duration. For example, when the backlight frequency multiplication factor is 2, the backlight partition is turned on twice within a frame duration, and the corresponding display partition presents the effect that the display partition can be bright once, dark once, bright once, and dark once within a frame duration.

[0152] In some embodiments, the determining the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate comprises:

[0153] When the refresh rate is less than or equal to a preset refresh rate, the backlight frequency multiplication factor of the frame to be displayed is determined as m, and in some embodiments, m is a positive integer greater than or equal to 2, and the preset refresh rate is greater than or equal to the refresh rate of the display panel corresponding to the backlight module flickering.

[0154] It can be understood that when the refresh rate is less than or equal to the preset refresh rate, the frequency of the light emitting device of the backlight module can be improved by performing frequency multiplication processing on the frame to be displayed, thereby avoiding the problem of low-frequency flickering.

[0155] It can be understood that when the refresh rate is less than or equal to the preset refresh rate, the backlight frequency multiplication factor of the frame to be displayed can be set according to actual needs, for example, it can be adjusted step by step until the backlight flickering no longer occurs.

[0156] Referring to FIG. 5, a detailed flowchart of step S30A of the embodiment of the present disclosure is shown. Referring to FIG. 6, a flowchart of a backlight driving method according to yet some embodiments of the present disclosure is shown.

[0157] In some embodiments, the determining the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate comprises:

[0158] Step S30A1. Obtain a plurality of preset refresh rate ranges, each of the preset refresh rate ranges corresponds to a frequency multiplication factor, and the frequency multiplication factors corresponding to different preset refresh rate ranges are different;

[0159] Step S30A2. Match the refresh rate with the plurality of preset refresh rate ranges, and take the frequency multiplication factor corresponding to the matched preset refresh rate range as the backlight frequency multiplication factor of the frame to be displayed;

[0160] In some embodiments, the larger the minimum value of the preset refresh rate range is, the smaller the corresponding frequency multiplication factor is.

[0161] That is, the smaller the refresh rate of the frame to be displayed is, the greater the backlight frequency multiplication factor is. For example, referring to FIG. 6, there are three preset refresh rate ranges, which are a first preset refresh rate range, a second preset refresh rate range and a third preset refresh rate range. First, it is determined whether the refresh rate of the frame to be displayed is within the first preset refresh rate range. If the refresh rate of the frame to be displayed is within the first preset refresh rate range, the backlight frequency multiplication factor is a first factor. If the refresh rate of the frame to be displayed is not within the first preset refresh rate range, it is determined whether the refresh rate of the frame to be displayed is within the second preset refresh rate range. If the refresh rate of the frame to be displayed is within the second preset refresh rate range, the backlight frequency multiplication factor is a second factor. If the refresh rate of the frame to be displayed is not within the second preset refresh rate range, it is determined whether the refresh rate of the frame to be displayed is within the third preset refresh rate range. The backlight frequency multiplication factor is a third factor. In some embodiments, other ways can be used to determine in which preset refresh rate range the refresh rate of the frame to be displayed is, which is not specifically limited here. In some embodiments, the preset refresh rate range can also be of other quantities, which is only taken three as an example here, and the specific quantity is not specifically limited.

[0162] It should be noted that, on the basis of frequency multiplication of the frame to be displayed, the backlight partition will be turned on at least twice within a frame duration, that is, the total black insertion duration is divided into at least two backlight subframe black insertion times. The backlight subframe black insertion time refers to the time for the backlight partition to insert black into the frame to be displayed once within a frame duration. For example, the frame duration is 20 ms, the black insertion ratio is 3 / 4, and the total black insertion duration is 15 ms. Assuming that the backlight frequency multiplication factor is 3, the backlight subframe black insertion time is 15 / 3 = 5 ms.

[0163] In some embodiments, before the backlight driving signal is provided for the backlight module according to the black insertion ratio and the backlight frequency multiplication factor, the method further includes:

[0164] Step S30A3. determining the frame duration of the frame to be displayed according to the refresh rate;

[0165] It can be understood that the frame duration can be the reciprocal of the refresh rate.

[0166] Step S30A4. determining the backlight subframe black insertion time of the frame to be displayed according to the frame duration, the black insertion ratio and the backlight frequency multiplication factor;

[0167] In some embodiments, the determination of the backlight subframe black insertion time of the frame to be displayed according to the frame duration, the black insertion ratio and the backlight frequency multiplication factor includes:

[0168] The backlight subframe black insertion time is determined according to the following formula (4):

[0169]

[0170] In some embodiments, Y represents the backlight subframe black insertion time, m represents the backlight frequency multiplication factor, T f represents the frame duration, X represents the black insertion ratio.

[0171] In step S30, the backlight driving signal is provided for the backlight module according to the black insertion ratio, including:

[0172] Step S40. The backlight driving signal is provided for the backlight module according to the black insertion ratio and the backlight frequency multiplication factor, for example, the backlight driving signal is provided for the backlight module according to the backlight subframe black insertion time and the backlight frequency multiplication factor.

[0173] Therefore, on the basis of inserting black into the frame to be displayed to overcome the problem of dynamic blur, the backlight frequency of the frame to be displayed is multiplied, thereby avoiding the backlight flicker problem that occurs at low frequency under variable refresh rate.

[0174] Based on the foregoing introduction, it can be known that the method of inserting black frame is used to reduce the display time of each frame picture, i.e. to reduce the MPRT time, and to overcome the problem of dynamic blur. In addition, the backlight frequency of the frame to be displayed is multiplied, thereby avoiding the backlight flicker problem that occurs at low frequency under variable refresh rate. However, the method of inserting black frame into the frame to be displayed shortens the backlight lighting time, resulting in reduced picture brightness. Therefore, the following description of the embodiments of the present disclosure explains how to solve the brightness reduction problem under the condition of inserting black frame.

[0175] Referring to FIG. 7, a flowchart of a backlight driving method according to some other embodiments of the present disclosure is shown.

[0176] In some embodiments, before the backlight driving signal is provided for the backlight module according to the black insertion ratio, the method further includes:

[0177] Step S30B. The current compensation factor of the frame to be displayed is determined according to the black insertion ratio.

[0178] It can be understood that, during the insertion of black, because the light-emitting time of the light-emitting device (LED) in the backlight module is shortened, the brightness will be suddenly reduced under the condition that the current is unchanged, at this time, the brightness can be ensured not to be reduced by increasing the current of the light-emitting device, therefore, the display brightness can be improved by multiplying the current of the light-emitting device. The current compensation multiple of the frame to be displayed refers to the multiple of the multiplication of the current of the frame to be displayed. During the process of the partition scanning, the average current during the insertion of black is not reduced and the brightness is not reduced by increasing the current of the backlight partition. At the same time, due to the partition scanning, the total instantaneous power consumption of the backlight is not increased. It should be noted that, during the partition scanning, the current of the backlight partition is increased when the backlight partition is lighted.

[0179] It should be noted that, when the display device does not perform the insertion of black, each backlight partition has a basic current, for example, 4 mA, 5 mA, 10 mA, etc. When the display device performs the insertion of black, the lighting time of each backlight partition is reduced, so the current of the backlight partition is increased when the backlight partition is lighted, and the current compensation multiple can refer to the multiple of the multiplication of the basic current, for example, 4 times, 5 times, 6 times, etc.

[0180] In some embodiments, the current compensation multiple of the frame to be displayed is determined according to the insertion of black ratio, comprising:

[0181] The current compensation multiple is determined according to the following formula (5):

[0182]

[0183] In some embodiments, A represents the current compensation multiple, and A is less than or equal to the maximum current compensation multiple, and X represents the insertion of black ratio.

[0184] It can be understood that, because the light-emitting device will be damaged under a large current and the light conversion efficiency is less than 1, the current compensation multiple is set to A times, which may not actually reach A times, therefore, in actual application, the current compensation multiple can be increased on the basis of A times to keep the brightness unchanged.

[0185] That is, when the insertion of black ratio is determined, the influence of the insertion of black ratio on the maximum current compensation multiple and the maximum response time of the dynamic picture should be considered. Because the larger the insertion of black ratio is, the longer the total insertion of black time is, the smaller the dynamic picture response time is, and the better the visual effect is, but the longer the total insertion of black time is, the greater the brightness decrease is, in order to ensure that the brightness does not decrease, the current needs to be increased, the current compensation multiple is proportional to the insertion of black ratio, and the current compensation multiple needs to be less than or equal to the maximum current compensation multiple due to the limitation of the chip and the circuit design, therefore, a suitable insertion of black ratio needs to be found to ensure that the dynamic picture response time is less than the maximum response time of the dynamic picture and the current does not exceed the standard.

[0186] In some embodiments, the providing the backlight driving signal for the backlight module according to the black insertion ratio comprises:

[0187] Step S50. Providing the backlight driving signal for the backlight module according to the black insertion ratio and the current compensation multiple.

[0188] In some embodiments, the providing the backlight driving signal for the backlight module according to the black insertion ratio comprises:

[0189] Providing the backlight driving signal for the backlight module according to the black insertion ratio, the backlight frequency multiplication multiple and the current compensation multiple.

[0190] In order to understand the corresponding relationship between the refresh rate, frame duration, total black insertion duration, backlight frequency multiplication multiple, backlight refresh rate (frequency of light emitting device in the backlight module), backlight sub-frame black insertion time and current compensation in the embodiments of the present disclosure, the following is exemplarily explained by Table 2.

[0191] Thus, on the basis of inserting black into the to-be-displayed frame to overcome the problem of dynamic blur, the embodiments of the present disclosure avoid the backlight flicker problem that occurs when the backlight is at a low frequency under variable refresh rate by multiplying the backlight of the to-be-displayed frame, and also overcome the problem of brightness reduction of the backlight partition caused by black insertion by increasing the current of the backlight partition.

[0192] Referring to FIG. 8, a structural block diagram of a backlight driving system according to some embodiments of the present disclosure is shown.

[0193] The second aspect of the embodiments of the present disclosure provides a backlight driving system 200 applied to a display device, the display device comprising a display panel and a backlight module stacked, the system 200 comprising: a first processor 201 and a second processor 202 in communication with each other, the first processor 201 being configured to be arranged on the display panel, and the second processor 202 being configured to be arranged on the second processor;

[0194] The first processor 201 is configured to send a refresh rate of a to-be-displayed frame of the display panel to the second processor 202.

[0195] The second processor 202 is configured to obtain the refresh rate and parameters of the display panel, determine a black insertion ratio of the to-be-displayed frame according to the refresh rate and the parameters of the display panel, and provide a backlight driving signal for the backlight module according to the black insertion ratio.

[0196] Exemplarily, the first processor 201 is a chip Scaler IC, and the second processor 202 is a backlight MCU. The communication interaction process of the first processor and the second processor is described.

[0197] Referring to FIG. 9, a signal transmission schematic diagram in the embodiment of the present disclosure is shown.

[0198] As shown in FIG. 9, after the chip Scaler IC receives the image information, the chip Scaler IC sends the data update identification signal Vsync and the MOSI signal to the backlight MCU through the SPI protocol. In some embodiments, the MOSI signal includes the brightness data of the frame to be displayed and the refresh rate data of the frame to be displayed. The backlight MCU analyzes the MOSI signal to obtain the control signal TX_DI, and sends the control signal TX_DI to the LED driver. The LED driver analyzes the control signal TX_DI, and transmits the backlight driving signal RX_CH to the LED lamp bead, so that the LED lamp bead is turned on or off according to the signal provided by the backlight driving signal RX_CH. In some embodiments, when RX_CH = H, the LED lamp bead is turned off; and when RX_CH = L, the LED lamp bead is turned on.

[0199] For example, in the test link, the OC (display panel) refresh rate is quickly switched from a low refresh rate to a high refresh rate (for example, 60 Hz is switched to 180 Hz). An oscilloscope is used to measure the waveform diagram when the refresh rate is switched, and whether the waveform is synchronized to change from 60 Hz to 180 Hz is observed. If yes, it proves that the Scalar IC / TCON sends the frame refresh rate information to the backlight MCU synchronously.

[0200] It can be understood that, after the chip Scaler IC receives the image information, the backlight brightness signal and the frame frequency signal (the refresh rate of the frame to be displayed) can be formed by encoding, and the MOSI signal and the Vsync signal are sent to the backlight MCU through the specified SPI format and timing requirements. In some embodiments, the MOSI signal includes the backlight brightness signal and the frame frequency signal, and the Vsync is a data update identification signal. The Vsync signal is used as a flag of frame picture update to notify the backlight MCU. The backlight MCU forms the control signal TX_DI by decoding, and sends the control signal TX_DI to the LED driver.

[0201] It should be noted that the chip Scaler IC can first send the frame frequency signal Vsync to the backlight MCU, and then send the MOSI signal to the backlight MCU through the SPI protocol. In some embodiments, when the data update identification signal Vsync changes from low level to high level, it means that the next frame signal is coming.

[0202] FIGS. 10-12 show the black insertion diagram of RX_CH when the refresh rate of the frame to be displayed is in different ranges. In FIGS. 10-12, when the high and low levels in RX_CH alternate, it is a normal display period, and when the high level signal lasts in a frame, it is a black insertion period.

[0203] In FIG. 10, when the refresh rate of the frame to be displayed is in a first preset refresh rate range, for example, greater than or equal to 48HZ and less than or equal to 60HZ, and the backlight frequency multiplication number is 3, RX_CH has three black insertions, three displays, and each black insertion lasts for 1 / 4 of the frame time of the frame to be displayed, and each display lasts for 1 / 12 of the frame time of the frame to be displayed. The backlight is multiplied in order to increase the frequency of the backlight to avoid the human eye from seeing the backlight flicker.

[0204] For example, in the test link, the refresh rate of the display panel can be adjusted to below 100Hz, an oscilloscope is used for testing, the output pin of the LED Driver (drive) of the light area backlight is controlled, and the waveform is observed. If the waveform in a frame is a waveform of a fixed frequency or a fixed value, it can be determined that the DC / PWM dimming mode is turned on. If the signal in a frame fluctuates n times, it can be determined that n frequency multiplication is turned on, for example, in FIG. 10, it can be seen that the waveform of the output pin (RX-IC) of the LED Driver oscillates three times in 1 frame (Frame) time, which indicates that it is 3 frequency multiplication.

[0205] In FIG. 11, when the refresh rate of the frame to be displayed is in a second preset refresh rate range, for example, greater than or equal to 61HZ and less than or equal to 99HZ, and the backlight frequency multiplication number is 2, RX_CH has two black insertions, two displays, and each black insertion lasts for 3 / 8 of the frame time of the frame to be displayed, and each display lasts for 1 / 8 of the frame time of the frame to be displayed. The backlight is multiplied in order to increase the frequency of the backlight to avoid the human eye from seeing the backlight flicker.

[0206] In FIG. 12, when the refresh rate of the frame to be displayed is in a third preset refresh rate range, for example, greater than or equal to 100HZ and less than or equal to 240HZ, and the backlight frequency multiplication number is 1, RX_CH has one black insertion, one display, and each black insertion lasts for 3 / 4 of the frame time of the frame to be displayed, and each display lasts for 1 / 4 of the frame time of the frame to be displayed. That is, in the third preset refresh rate range, the backlight is no longer multiplied.

[0207] It should be noted that the first preset refresh rate range, the second preset refresh rate range, and the third preset refresh rate range defined above are only illustrative examples, and in some embodiments, the number of preset refresh rate ranges, the range of preset refresh rates, and the corresponding backlight frequency multiplication factor are not specifically limited here, and can be designed according to the use requirements in some embodiments.

[0208] Referring to FIG. 13, a structural block diagram of a display device according to some embodiments of the present disclosure is shown.

[0209] The third aspect of the embodiments of the present disclosure provides a display device 300, comprising a display panel and a backlight module stacked with each other, and the backlight driving system 200 as described in the second aspect. The display device 300 can be a mobile phone, a television, a display, a tablet computer, a navigator, or the like, which is a product or a component having a display function.

[0210] Referring to FIG. 14, a structural block diagram of an electronic device according to some embodiments of the present disclosure is shown.

[0211] According to still another aspect of the present disclosure, an electronic device is provided, comprising a memory 902 and a processor 901, wherein the memory 902 stores a computer program, and the computer program is executed by the processor to implement the backlight driving method described above.

[0212] In some embodiments, the processor 901 is a device having data processing capability, including but not limited to a central processing unit (CPU) and the like; the memory 902 is a device having data storage capability, including but not limited to a random access memory (RAM, more specifically SDRAM, DDR, and the like), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory (FLASH).

[0213] In some optional embodiments, the electronic device further comprises one or more I / O interfaces 903 connected between the processor and the memory, configured to realize data interaction between the processor and the memory. The I / O interface (read-write interface) 903 is connected between the processor 901 and the memory 902, and can realize data interaction between the processor 901 and the memory 902, including but not limited to a data bus (Bus) and the like.

[0214] In some embodiments, the processor 901, the memory 902 and the I / O interface 903 are connected to each other through a bus, and further connected to other components of the computing device.

[0215] In some other embodiments, the present disclosure provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the backlight driving method described above.

[0216] Those of ordinary skill in the art will realize and understand, all or certain steps in the methods, modules / units in the systems and apparatuses disclosed above can be implemented as software, firmware, hardware and appropriate combination thereof. In hardware implementation, the division between the modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Certain physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, it is well known to those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and can include any information delivery media.

[0217] It should be noted that the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusions, such that a process, method, article or apparatus that comprises a list of elements does not necessarily include only those elements in the list, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, an element defined by the phrase "comprising a" does not exclude the presence of the same element in the process, method, article or apparatus including the element in some embodiments.

[0218] It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps other than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices, apparatuses or means can be listed, comprising means for carrying out a certain task. The use of the term "means" in a claim is intended to refer to a combination of means for performing a task, even if such means are not explicitly recited in the claim. The word "first", "second", "third", etc. does not necessarily indicate any order. These words can be understood as names.

[0219] The foregoing is merely illustrative of the principles of this disclosure and various modifications can be made by those skilled in the art without departing from the scope of the disclosure. The above-described embodiments are presented for purposes of illustration and not limitation, and the present disclosure is limited only by the claims.

Claims

1. A backlight driving method applied to a display device, the display device comprising a display panel and a backlight module stacked, the method comprising: obtaining a refresh rate of a frame to be displayed of the display panel, and a parameter of the display panel; determining a black frame insertion ratio of the frame to be displayed according to the refresh rate and the parameter of the display panel; and providing a backlight driving signal for the backlight module according to the black frame insertion ratio. The parameter of the display panel comprises a number of backlight black frame insertion partitions, a vertical blanking time and a liquid crystal response time. The determining of the black frame insertion ratio of the frame to be displayed according to the refresh rate and the parameter of the display panel comprises: determining a frame duration of the frame to be displayed according to the refresh rate; determining a minimum black frame duration of the frame to be displayed according to the number of backlight black frame insertion partitions, the vertical blanking time, the liquid crystal response time and the frame duration; and determining the black frame insertion ratio of the frame to be displayed according to the minimum black frame duration and the frame duration. The determining of the minimum black frame duration of the frame to be displayed according to the number of backlight black frame insertion partitions, the vertical blanking time, the liquid crystal response time and the frame duration comprises: determining a maximum black frame duration of the frame to be displayed according to the number of backlight black frame insertion partitions, the vertical blanking time and the liquid crystal response time; and determining the minimum black frame duration of the frame to be displayed according to the maximum black frame duration and the frame duration. The determining of the black frame insertion ratio of the frame to be displayed according to the minimum black frame duration and the frame duration comprises: determining the black frame insertion ratio of the frame to be displayed according to the minimum black frame duration and the frame duration.

2. The method of claim 1, wherein, 5.The method of claim 4, after the determining of the black frame insertion ratio according to the minimum black frame duration and the frame duration, the method further comprises: obtaining a maximum response time of a dynamic picture; the MPRT represents the response time of the dynamic picture; and the display panel comprises a plurality of display partitions, the backlight module comprises a plurality of backlight partitions, the backlight partitions correspond to the display partitions one by one, the providing of the backlight driving signal for the backlight module according to the black frame insertion ratio comprises: providing the backlight driving signal for the backlight partitions according to the black frame insertion ratio, so that the backlight partitions perform black frame insertion for the corresponding display partitions according to the black frame insertion ratio. The providing of the backlight driving signal for the backlight partitions according to the black frame insertion ratio, so that the backlight partitions perform black frame insertion for the corresponding display partitions according to the black frame insertion ratio comprises: providing the backlight driving signal for each of the backlight partitions at different times according to the black frame insertion ratio within a frame duration, so that at least two of the backlight partitions perform black frame insertion for the corresponding display partitions according to the black frame insertion ratio at different times within the frame duration. The liquid crystal flipping periods of each of the display partitions are different and do not overlap within a frame duration. The display partitions comprise a first display partition and a second display partition, the second display partition being at least one other than the first display partition, the backlight partitions comprise a first backlight partition and a second backlight partition, the first backlight partition corresponding to the first display partition, the second backlight partition being at least one other than the first backlight partition. The providing of the backlight driving signal for the backlight partitions according to the black frame insertion ratio comprises:

3. The method of claim 2, wherein, ​ determining the minimum sparsification duration according to formula (1): In some embodiments, T s represents the minimum black insertion duration, T f represents the frame duration, T v represents the vertical blanking time, T r represents the liquid crystal response time, and n represents the number of backlight black insertion partitions.

4. The method of claim 2, wherein, ​ The black insertion ratio is determined according to formula (2): In some embodiments, T s represents the minimum black insertion duration, T f represents the frame duration, X represents the black insertion ratio, T b represents a constant, T b is greater than 0 and less than T f -T s . ​ ​ determining a dynamic picture response time of the frame to be displayed according to formula (3): ​ ​ if the dynamic picture response time is greater than the dynamic picture maximum response time, then adjust constant T b to correct the black insertion ratio.

6. The method of any one of claims 1-5, wherein, ​ ​ 7. The method of claim 6, wherein, ​ ​ 8. The method of claim 6, wherein, ​ ​ ​ In a liquid crystal flipping process of the first display partition, a first backlight driving signal is provided to the first backlight partition according to the black insertion ratio, and a second backlight driving signal is provided to the second backlight partition; The first backlight driving signal is used to control the first backlight partition to perform black insertion for the first display partition in the liquid crystal flipping process of the first display partition; the second backlight driving signal is used to control the second backlight partition to provide backlight for the corresponding second display partition in the liquid crystal flipping process of the first display partition; and the black insertion time length of the first backlight partition and the second backlight partition in one frame time length satisfies the black insertion ratio.

9. The method of claim 8, wherein, The second backlight partition is one of the plurality of backlight partitions except the first backlight partition.

10. The method of claim 8, wherein, The second backlight partition is spaced apart from the first backlight partition.

11. The method of claim 6, wherein, The backlight module includes a plurality of light source blocks arranged in an array, and the number of the light source blocks is an integer multiple of the number of the display partitions and / or the number of the backlight partitions.

12. The method of any of claims 1-5 or 7-11, before the providing the backlight driving signal to the backlight module according to the black insertion ratio, the method further comprises: determining a backlight frequency multiplication factor of the frame to be displayed according to the refresh rate; the providing the backlight driving signal to the backlight module according to the black insertion ratio, comprises: providing the backlight driving signal to the backlight module according to the black insertion ratio and the backlight frequency multiplication factor.

13. The method of claim 12, wherein, the determining the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate, comprises: when the refresh rate is less than or equal to a preset refresh rate, determining the backlight frequency multiplication factor of the frame to be displayed as m, m is a positive integer greater than or equal to 2, and the preset refresh rate is greater than or equal to a refresh rate of the display panel corresponding to a flicker of the backlight module.

14. The method of claim 12, wherein, the determining the backlight frequency multiplication factor of the frame to be displayed according to the refresh rate, comprises: obtaining a plurality of preset refresh rate ranges, each of the preset refresh rate ranges corresponds to a frequency multiplication factor, and the frequency multiplication factors corresponding to different preset refresh rate ranges are different; matching the refresh rate with the plurality of preset refresh rate ranges, and taking the frequency multiplication factor corresponding to the matched preset refresh rate range as the backlight frequency multiplication factor of the frame to be displayed; and the greater the minimum value of the preset refresh rate range, the smaller the corresponding frequency multiplication factor.

15. The method of claim 12, before the providing the backlight driving signal to the backlight module according to the black insertion ratio and the backlight frequency multiplication factor, the method further comprises: determining a frame time length of the frame to be displayed according to the refresh rate; determining a backlight sub-frame black insertion time of the frame to be displayed according to the frame time length, the black insertion ratio, and the backlight frequency multiplication factor; the providing the backlight driving signal to the backlight module according to the black insertion ratio and the backlight frequency multiplication factor, comprises: providing the backlight driving signal to the backlight module according to the backlight sub-frame black insertion time and the backlight frequency multiplication factor.

16. The method of claim 15, wherein, The determining the backlight subframe black insertion time of the frame to be displayed according to the frame length, the black insertion ratio and the backlight frequency multiplication factor comprises: The backlight subframe blanking time is determined according to the following equation (4): Y represents the backlight subframe blanking time, m represents the backlight frequency multiplication factor, T f represents the frame duration, X represents the blanking ratio.

17. The method of claim 1, before the providing the backlight driving signal for the backlight module according to the black insertion ratio, the method further comprises: determining a current compensation multiplication factor of the frame to be displayed according to the black insertion ratio; The providing the backlight driving signal for the backlight module according to the black insertion ratio comprises: providing the backlight driving signal for the backlight module according to the black insertion ratio and the current compensation multiplication factor.

18. The method of claim 17, wherein, The determining the current compensation multiplication factor of the frame to be displayed according to the black insertion ratio comprises: The current compensation multiple is determined according to the following equation (5): A represents the current compensation multiplication factor, and A is less than or equal to a maximum current compensation multiplication factor, and X represents the black insertion ratio.

19. The method of any one of claims 1-5, any one of 7-11, or any one of 13-18, wherein, The black insertion ratio is in a range of 75% to 90%.

20. The method of any of claims 1-5, any of claims 7-11, or any of claims 13-18, after the obtaining the refresh rate of the frame to be displayed of the display panel, the method further comprises: when the refresh rate is less than or equal to a preset refresh rate, providing a target driving signal for the backlight module, and not performing the determining the black insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel; the preset refresh rate is greater than or equal to a refresh rate of the display panel corresponding to a flicker of the backlight module, and the target driving signal is used to control the backlight module to pulse dim and / or direct current dim the display panel. 21.A backlight driving system applied to a display device, the display device comprising a display panel and a backlight module stacked, the system comprising: a first processor and a second processor in communication with each other, the first processor being configured to be arranged in the display panel, and the second processor being configured to be arranged in the second processor; the first processor is configured to send a refresh rate of a frame to be displayed of the display panel to the second processor; the second processor is configured to obtain the refresh rate and parameters of the display panel, determine a black insertion ratio of the frame to be displayed according to the refresh rate and the parameters of the display panel, and provide a backlight driving signal for the backlight module according to the black insertion ratio.

22. A display device comprising: a display panel and a backlight module arranged in a stack, and the backlight driving system of claim 21.

23. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program, the computer program being executed by the processor to implement the backlight driving method of any of claims 1 to 20.

24. A non-transitory computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the backlight driving method of any of claims 1 to 20.

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