Display device and backlight module driving method

Abstract

This application provides a display device and a backlight module driving method. When the display device is in Variable Refresh Rate (VRR) mode, the dimming mode of the backlight module can be adjusted to analog dimming mode. In analog dimming mode, the backlight brightness of the backlight module can be adjusted by adjusting the power supply voltage / current of the backlight module to ensure the normal operation of the display module. Since the analog dimming mode does not have a refresh rate, there is no phase difference. Therefore, without increasing hardware costs, screen flicker or water ripple phenomena can be avoided, thereby ensuring the display quality of the screen and improving the user's viewing experience. In addition, it can also help improve the photoelectric conversion efficiency of the components in the display device.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display device and a backlight module driving method. Background Technology

[0002] The refresh rate of an LCD screen refers to the vertical scanning frequency of the screen, which is the number of images that the screen can display per second. The backlight frequency is the adjustment frequency of the backlight pulse width modulation (PWM) signal of the light-emitting diode (LED) in the screen's backlight module.

[0003] Based on Variable Refresh Rate (VRR) technology, the screen's refresh rate can change dynamically.

[0004] However, if there is a phase difference between the dynamically changing refresh rate and the fixed backlight frequency, it can cause screen flicker or water ripples, thus affecting the display quality. Summary of the Invention

[0005] This application provides a display device and a backlight module driving method to solve the problems existing in the related technologies.

[0006] In a first aspect, this application provides a display device, comprising:

[0007] A display includes a display module and a backlight module, wherein the backlight module is used to provide light sources with different backlight brightness to the display module so that the display module displays images with different display brightness;

[0008] A controller connected to the display is configured to:

[0009] When the display device is detected to have entered the Variable Refresh Rate (VRR) mode, the dimming mode of the backlight module is adjusted to the analog dimming mode.

[0010] Based on the target brightness displayed on the display module according to the display data, the power supply voltage / current of the backlight module is adjusted so that the backlight brightness provided by the backlight module is consistent with the target brightness.

[0011] In some embodiments, the controller is further configured to:

[0012] Determine whether the display device has local dimming function enabled;

[0013] If the display device has enabled local dimming, then determine whether the display device supports simulated local dimming.

[0014] If the display device supports simulated local dimming, the power supply voltage / current of the backlight module corresponding to each zone is adjusted according to the target brightness of each zone when displayed on the display module based on the display data.

[0015] In some embodiments, the controller is further configured to:

[0016] Based on the power supply voltage / current of the backlight module corresponding to each zone, the color temperature correction amount corresponding to each zone is determined, and color temperature correction processing of each zone is performed based on the color temperature correction amount.

[0017] In some embodiments, the controller is further configured to:

[0018] Increase the target brightness corresponding to the first display data in each partition, and decrease the target brightness corresponding to the second display data in each partition;

[0019] Wherein, the first display data is display data with a grayscale value greater than or equal to a preset threshold, and the second display data is display data with a grayscale value less than the preset threshold.

[0020] In some embodiments, the controller is further configured to:

[0021] If the display device does not have local dimming function enabled, the corresponding color temperature correction amount is determined according to the power supply voltage / current of the backlight module, and color temperature correction processing is performed based on the color temperature correction amount.

[0022] In some embodiments, the controller is further configured to:

[0023] If the display device does not support analog local dimming, the power supply voltage / current of the backlight module is adjusted according to the target brightness when the display data is displayed on the display module.

[0024] The power supply voltage / current of the backlight modules corresponding to each partition is the same.

[0025] In some embodiments, the controller is further configured to:

[0026] Control the display device to turn off the local dimming function and the image compensation function corresponding to the local dimming function.

[0027] In some embodiments, the controller is further configured to:

[0028] The corresponding color temperature correction amount is determined based on the power supply voltage / current of the backlight module, and color temperature correction processing is performed based on the color temperature correction amount.

[0029] Secondly, this application provides a backlight module driving method, including:

[0030] When the display device is detected to have entered the Variable Refresh Rate (VRR) mode, the dimming mode of the backlight module is adjusted to the analog dimming mode.

[0031] Based on the target brightness displayed on the display module according to the display data, the power supply voltage / current of the backlight module is adjusted so that the backlight brightness provided by the backlight module is consistent with the target brightness.

[0032] In some embodiments, it also includes:

[0033] Determine whether the display device has local dimming function enabled;

[0034] If the display device has enabled local dimming, then determine whether the display device supports simulated local dimming.

[0035] If the display device supports simulated local dimming, the power supply voltage / current of the backlight module corresponding to each zone is adjusted according to the target brightness of each zone when displayed on the display module based on the display data.

[0036] The display device and backlight module driving method provided in this application can adjust the dimming mode of the backlight module to analog dimming mode when the display device is in variable refresh rate (VRR) mode. In analog dimming mode, the backlight brightness of the backlight module can be adjusted by adjusting the power supply voltage / current of the backlight module to ensure the normal operation of the display module. Since the analog dimming mode does not have a refresh rate, there is no phase difference, thus avoiding screen flicker or water ripple effects without increasing hardware costs, thereby ensuring screen display quality and improving the user's viewing experience. Additionally, it can also help improve the photoelectric conversion efficiency of components in the display device. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0038] Figure 1 This is a schematic diagram illustrating the usage scenario of the display device according to the embodiment;

[0039] Figure 2 An exemplary block diagram of the configuration of the control device 100 according to an exemplary embodiment is shown;

[0040] Figure 3 A hardware configuration block diagram of a display device 200 according to an exemplary embodiment is shown;

[0041] Figure 4The diagram illustrates, by way of example, a software configuration diagram of a display device according to some embodiments;

[0042] Figure 5 This is a diagram illustrating screen tearing.

[0043] Figure 6 This is an illustration of screen stuttering;

[0044] Figure 7 This is a schematic diagram of a variable refresh rate.

[0045] Figure 8 A schematic diagram of a display device provided in an embodiment of this application;

[0046] Figure 9 This is a schematic diagram illustrating the digital dimming principle in some embodiments of this application;

[0047] Figure 10 This is a schematic diagram illustrating the simulated dimming principle in some embodiments of this application;

[0048] Figure 11 This is a schematic diagram of the fitting curve for color temperature correction processing in the embodiments of this application;

[0049] Figure 12 This is a schematic diagram of a backlight module driving method provided in an embodiment of this application.

[0050] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms "a" and "the" as used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0053] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0054] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0055] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0056] Figure 1 This is a schematic diagram illustrating a usage scenario of the display device according to an embodiment. For example... Figure 1 As shown, the display device 200 also communicates with the server 400, and the user can operate the display device 200 through the smart device 300 or the control device 100.

[0057] In some embodiments, the smart device 300 may include any one of a mobile terminal, tablet computer, computer, laptop computer, AR / VR device, etc.

[0058] In some embodiments, a smart device 300 may also be used to control a display device 200.

[0059] In some embodiments, the smart device 300 and the display device may also be used for data communication.

[0060] In some embodiments, the display device 200 may also be controlled in ways other than the control device 100 and the smart device 300.

[0061] In some embodiments, the display device 200 also communicates data with the server 400.

[0062] Figure 2 An exemplary block diagram of the configuration of the control device 100 according to an exemplary embodiment is shown. Figure 2 As shown, the control device 100 includes a controller 110, a communication interface 130, a user input / output interface 140, a memory, and a power supply. The control device 100 can receive user input operation commands and convert the operation commands into commands that the display device 200 can recognize and respond to, thus acting as an intermediary for interaction between the user and the display device 200.

[0063] In some embodiments, the communication interface 130 is used for external communication and includes at least one of a WIFI chip, a Bluetooth module, an NFC module, or an alternative module.

[0064] In some embodiments, the user input / output interface 140 includes at least one of a microphone, touchpad, sensor, button, or alternative module.

[0065] Figure 3 A hardware configuration block diagram of a display device 200 according to an exemplary embodiment is shown.

[0066] In some embodiments, the display device 200 includes at least one of a tuner 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and a user interface.

[0067] In some embodiments, the controller includes a central processing unit, a video processor, an audio processor, a graphics processor, RAM, ROM, and a first to an nth interface for input / output.

[0068] In some embodiments, the display 260 includes a display screen component for presenting an image, a driving component for driving image display, a component for receiving image signals output from a controller, and a user control UI interface, etc.

[0069] In some embodiments, the display 260 may be at least one of a liquid crystal display, an OLED display, and a projection display, and may also be a projection device and a projection screen.

[0070] In some embodiments, the tuner 210 receives broadcast television signals via wired or wireless reception and demodulates audio and video signals, such as EPG data signals, from a plurality of wireless or wired broadcast television signals.

[0071] In some embodiments, the communicator 220 is a component for communicating with external devices or servers according to various communication protocol types.

[0072] In some embodiments, detector 230 is used to acquire signals from the external environment or interactions with the outside world. For example, detector 230 includes a light receiver, a sensor for acquiring ambient light intensity; or, detector 230 includes an image acquisition device, such as a camera, which can be used to acquire external environmental scenes, user attributes, or user interaction gestures; or, detector 230 includes a sound acquisition device, such as a microphone, for receiving external sounds.

[0073] In some embodiments, the external device interface 240 may include, but is not limited to, one or more interfaces such as: High Definition Multimedia Interface (HDMI), analog or data high-definition component input interface (component), composite video input interface (CVBS), USB input interface (USB), RGB port, etc. It may also be a composite input / output interface formed by multiple interfaces mentioned above.

[0074] In some embodiments, the controller 250 and the tuner 210 may be located in different separate devices, that is, the tuner 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.

[0075] In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in memory. The controller 250 controls the overall operation of the display device 200.

[0076] In some embodiments, the object can be any of the optional objects, such as hyperlinks, icons, or other operable controls.

[0077] In some embodiments, the controller includes at least one of a central processing unit (CPU), a video processor, an audio processor, a graphics processing unit (GPU), RAM (random access memory), ROM (read-only memory), a first to an nth interface for input / output, a communication bus, etc.

[0078] CPU (CPU) processor. It executes operating system and application instructions stored in memory, as well as various interactive instructions received from external input, to run various applications, data, and content, ultimately displaying and playing various audio and video content.

[0079] In some embodiments, a graphics processor is used to generate various graphics objects.

[0080] In some embodiments, a video processor is configured to receive an external video signal and perform at least one of the following video processing operations according to a standard encoding and decoding protocol of the input signal: decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, image synthesis, etc., to obtain a signal that can be directly displayed or played on a display device 200.

[0081] In some embodiments, the video processor includes at least one of a demultiplexing module, a video decoding module, an image compositing module, a frame rate conversion module, and a display formatting module.

[0082] In some embodiments, an audio processor is configured to receive external audio signals, perform decompression and decoding according to a standard codec protocol of the input signal, and at least one of the following processes: noise reduction, digital-to-analog conversion, and amplification, to obtain a sound signal that can be played in a speaker.

[0083] In some embodiments, a user can input user commands through a graphical user interface (GUI) displayed on a display 260, and the user input interface receives user input commands through the graphical user interface (GUI).

[0084] In some embodiments, a "user interface" is a medium interface through which an application or operating system interacts and exchanges information with a user, enabling the conversion between the internal form of information and a form acceptable to the user.

[0085] In some embodiments, the user interface 280 is an interface that can be used to receive control input (e.g., physical buttons on the display device body, or others).

[0086] In some embodiments, the display device's system may include a kernel, a command interpreter (shell), a file system, and applications. The kernel, shell, and file system together form the basic operating system structure, allowing users to manage files, run programs, and use the system.

[0087] See Figure 4 In some embodiments, the system is divided into four layers, from top to bottom: the Applications layer (referred to as the "Application Layer"), the Application Framework layer (referred to as the "Framework Layer"), the Android runtime and system library layer (referred to as the "System Runtime Layer"), and the kernel layer.

[0088] In some embodiments, at least one application runs in the application layer. These applications may be Windows programs, system settings programs, or clock programs that come with the operating system; or they may be applications developed by third-party developers.

[0089] The framework layer provides application programming interfaces (APIs) and programming frameworks for applications in the application layer.

[0090] like Figure 4 As shown, the application framework layer in this embodiment includes managers, content providers, etc.

[0091] First, let me explain the terms used in this application:

[0092] 1. Refresh Rate: Also known as Field Frequency, it refers to the vertical scanning frequency of the screen, that is, the number of images that the screen can display per second, measured in Hertz (Hz). The higher the refresh rate, the more times the image is refreshed, the less flickering the image is displayed, and the higher the picture quality.

[0093] 2. Screen tearing: When the previous frame (Frame(n)) on the screen has not completely disappeared, a new frame (Frame(n+1)) is output to the display screen. Two different frames appear on the screen panel at the same time, that is, two frames are corresponding to one scan signal. At this time, the screen refresh node has not been reached, and screen tearing occurs.

[0094] Figure 5 This is an illustration of screen tearing, such as... Figure 5 As shown, the screen panel refresh rate is fixed. During the first scan signal Scan (0 / 1) of the panel, the first frame (1) of the graphics processing unit (GPU) is displayed on the panel. Before Frame (1) completely disappears, the second frame (2) is output to the panel for display. At this time, the first scan signal Scan (0 / 1) corresponds to frames (1) and (2), and point a displays two frames simultaneously. However, point a has not reached the first refresh node of the panel (16ms), that is, screen tearing occurs at point a. Similarly, screen tearing occurs at points b, c, and d.

[0095] 3. Stuttering: Due to inadequate game optimization or insufficient hardware configuration of the device, some parts of the game's graphics generation process are slowed down, resulting in a mismatch between the GPU's output time and the panel's refresh time, causing screen stuttering.

[0096] Figure 6 This is an illustration of screen stuttering, such as... Figure 6 As shown, the screen panel refresh rate is fixed. During the first scan signal Scan, the first frame (1) output by the GPU is displayed on the panel. When the first refresh node is reached at 16ms, the second scan signal Scan (1) corresponds to the second frame (2). When the second refresh node is reached at 32ms, the GPU does not output a new frame, resulting in a time misalignment, which causes screen stuttering at point e. When the third refresh node is reached at 48ms, the third frame (3) output by the GPU is displayed on the panel.

[0097] 4. Variable Refresh Rate (VRR): This refers to the frequency at which the display screen refreshes according to the GPU's output frequency. It is primarily used (in games) to reduce or eliminate screen lag, stuttering, and tearing, ensuring smooth display and detail. Existing variable refresh rate technologies mainly include FreeSync (developed by AMD) and G-Sync (developed by Nvidia).

[0098] Figure 7 This is a diagram illustrating a variable refresh rate, such as... Figure 7 As shown, the screen's panel refresh rate is not a fixed value. Instead, the panel refreshes after the GPU's output frame is refreshed. In other words, the panel refresh rate changes with the GPU's output frequency, which can reduce or eliminate screen tearing, stuttering, and other issues.

[0099] 5. Local Dimming: This method divides the entire display area of ​​the screen into multiple zones, and then adjusts the brightness of each zone (i.e., local area) separately, rather than adjusting the overall brightness of the entire display area of ​​the screen.

[0100] For display screens using variable refresh rate mode, since the screen refresh rate is adjusted in real time, if there is a phase difference between the refresh rate of the LCD screen and the backlight frequency of the LED backlight, it will cause screen flicker or screen ripples in dark fields, thus affecting the display quality of the screen.

[0101] The display device and backlight module driving method provided in this application are intended to solve the above-mentioned technical problems in related technologies.

[0102] The main concept of this application is as follows: when the display device is in the variable refresh rate (VRR) mode, the dimming mode of the backlight module can be adjusted to the analog dimming mode. In the analog dimming mode, the display device can adjust the backlight brightness of the backlight module by adjusting the power supply voltage / current of the backlight module. Since the analog dimming mode does not have a refresh rate, screen flicker or water ripples can be avoided without increasing hardware costs, thereby ensuring the display quality of the screen and improving the user's viewing experience.

[0103] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0104] In some embodiments, a display device is provided. Figure 8 This is a schematic diagram of a display device provided in an embodiment of this application, such as... Figure 8 As shown, the display device includes:

[0105] The display 810 includes a display module 812 and a backlight module 814, the backlight module providing light sources of varying backlight brightness to the display module so that the display module can display images of different brightness levels; and a controller 820 connected to the display. The display 810 can correspond to... Figure 3 The monitor 260 and controller 820 in the diagram can correspond to... Figure 3 The controller 250 in the middle.

[0106] In this embodiment, the controller is configured as follows:

[0107] When the display device is detected to have entered Variable Refresh Rate (VRR) mode, the dimming mode of the backlight module is adjusted to analog dimming mode.

[0108] Based on the target brightness displayed on the display module according to the display data, adjust the power supply voltage / current of the backlight module so that the backlight brightness provided by the backlight module is consistent with the target brightness.

[0109] Specifically, the dimming methods of backlight modules include digital dimming and analog dimming.

[0110] Digital dimming refers to a dimming method that uses PWM technology to adjust the LED backlight. Figure 9 This is a schematic diagram of the digital dimming principle shown in some embodiments of this application, such as... Figure 9As shown, during the period when the PWM output is high, the backlight power supply circuit is turned on, and the backlight is lit; during the period when the PWM output is low, the backlight power supply circuit is turned off, and the backlight is turned off. In this example, a PWM output with a 100% duty cycle is used to adjust the backlight to 100% brightness, a PWM output with a 50% duty cycle is used to adjust the backlight to medium brightness, and a PWM output with a 20% duty cycle is used to adjust the backlight to low brightness.

[0111] In addition, the dimming principle of the analog dimming method is to keep the backlight power supply circuit continuously conducting and adjust the backlight brightness by adjusting the power supply voltage / current. Figure 10 This is a schematic diagram illustrating the simulated dimming principle in some embodiments of this application, such as... Figure 10 As shown, when the power supply voltage / current ratio is high, the backlight can be adjusted to high brightness; when the power supply voltage / current ratio is medium, the backlight can be adjusted to medium brightness; and when the power supply voltage / current ratio is low, the backlight can be adjusted to low brightness.

[0112] Because digital dimming and analog dimming operate on different principles, digital dimming, due to the refresh cycle of the PWM signal, results in continuous backlight brightness changes on the screen. Although these changes exceed the range of human visual perception, prolonged screen viewing can still cause eye strain. Simultaneously, since the displayed image also has a refresh cycle, a phase difference between the screen's refresh rate and the PWM refresh rate can cause screen flicker or ripple effects, impacting display quality. Furthermore, the backlight power supply circuit, controlled by the PWM signal, frequently switches on and off, consuming some electrical energy in the switching of components, thus reducing photoelectric conversion efficiency and resulting in a lower performance index for the display device.

[0113] As for analog dimming, since there is no refresh cycle, it does not cause visual fatigue or the "water ripple" phenomenon, and the photoelectric conversion efficiency is also relatively high.

[0114] Based on the above principle, when the controller detects that the display device has entered VRR mode, since the screen refresh rate changes accordingly with the GPU output frequency in VRR mode, if the backlight module's current dimming mode is digital dimming, a phase difference may occur between the screen refresh rate and the LED backlight frequency, leading to screen flicker or screen ripples in dark environments. Therefore, in the technical solution of this application, when the controller detects that the display device has entered VRR mode, the controller adjusts the backlight module's dimming mode to analog dimming mode.

[0115] Specifically, the controller can adjust the dimming mode in the following two ways depending on the actual situation: (1) If the backlight module dimming mode is digital dimming mode when the display device enters VRR mode, then switch to analog dimming mode; (2) If the backlight module dimming mode is analog dimming mode when the display device enters VRR mode, then continue to maintain analog dimming mode.

[0116] After the controller adjusts the dimming mode of the backlight module to analog dimming mode, if the display device obtains the display data that needs to be displayed, the controller can adjust the power supply voltage / current of the backlight module according to the target brightness when the display data is displayed on the display module, so that the backlight brightness of the light source provided by the backlight module is consistent with the target brightness, thereby ensuring that the display module can display the image corresponding to the display data according to the target brightness.

[0117] This embodiment provides a display device that, when in Variable Refresh Rate (VRR) mode, can adjust the dimming mode of the backlight module to analog dimming mode. In analog dimming mode, the backlight brightness of the backlight module can be adjusted by changing the power supply voltage / current to ensure normal operation of the display module. Since analog dimming mode does not have a refresh rate, there is no phase difference, thus avoiding screen flicker or water ripple effects without increasing hardware costs, thereby ensuring screen display quality and improving the user's viewing experience. Additionally, it can also help improve the photoelectric conversion efficiency of components in the display device.

[0118] In some embodiments, the controller is further configured to: determine whether the display device has enabled local dimming function; if the display device has enabled local dimming function, determine whether the display device supports simulated local dimming; if the display device supports simulated local dimming, adjust the power supply voltage / power supply current of the backlight module corresponding to each zone according to the target brightness of each zone when the display data is displayed on the display module.

[0119] Specifically, for display devices with local dimming capabilities, the screen can be divided into multiple zones, such as dividing the entire screen into M*N zones, and then dimming processing can be performed on each zone separately, that is, adjusting the backlight brightness of the backlight module corresponding to each zone separately.

[0120] After the controller determines that the display device has enabled the local dimming function, it means that the display device currently supports dimming of different zones of the screen separately. At this time, the controller further determines whether the display device supports dimming of different zones through simulated dimming. If the display device supports simulated local dimming, the controller adjusts the power supply voltage / current of the backlight module corresponding to each zone according to the target brightness of each zone displayed on the display module based on the display data, so that the display brightness of different zones of the screen is different, thereby realizing simulated dimming processing of each zone.

[0121] In the technical solution of this embodiment, on the one hand, by using zoned light control, brightness can be allocated according to the brightness requirements of different zones, making the bright areas of the screen brighter and the dark areas darker, thus optimizing the screen contrast; on the other hand, by simulating zoned light control, screen flicker or water ripples can also be avoided, thereby ensuring the display quality of the screen and improving the user's viewing experience.

[0122] In some embodiments, the controller is further configured to: determine the color temperature correction amount corresponding to each partition based on the power supply voltage / power supply current of the backlight module corresponding to each partition, and perform color temperature correction processing on each partition based on the color temperature correction amount.

[0123] When performing local dimming through simulated local dimming, the power supply voltage / current of different zones needs to be adjusted. As the power supply voltage / current changes, the color temperature of the LED will also change.

[0124] Taking a high-power white LED as an example, the color temperature varies depending on the supply current within its operating range. As the supply current increases, the LED emits more blue light. Since the phosphor layer thickness is constant, the blue light component in the emitted white light increases, leading to a higher color temperature. For instance, when the supply current is 100mA, the color temperature of a high-power white LED is 5636K; however, when the supply current increases to 350mA, the color temperature increases to 5734K.

[0125] Since changes in color temperature can further cause color cast on the screen, such as cool tones turning bluish and warm tones turning yellowish, local color temperature offset correction is also required when performing local dimming through simulated local dimming in order to achieve white balance.

[0126] Specifically, when the controller determines that color temperature offset correction is required, it first determines the color temperature correction amount for each zone based on the power supply voltage / current of the backlight module corresponding to each zone. After obtaining the color temperature correction amount, it performs color temperature correction processing for each zone based on the color temperature correction amount corresponding to each zone.

[0127] Table 1 below is an example of a simulated dimming color temperature correction table:

[0128] Supply current 100mA 150mA 200mA 250mA 300mA 350mA red 0 0 0 0 0 0 green 0 0 0 0 0 0 blue 0 -4 -5 -6 -8 -10

[0129] Table 1

[0130] Correspondingly, Figure 11 The above table shows a schematic diagram of the fitting curve for color temperature correction processing in the embodiments of this application. Figure 11 As shown, the larger the supply current, the more blue components are in the white light emitted by the LED. Therefore, the color temperature of the blue light can be corrected according to the magnitude of the supply current, thereby achieving white balance and improving display quality.

[0131] In some embodiments, the controller is further configured to: increase the target brightness corresponding to the first display data in each partition, and decrease the target brightness corresponding to the second display data in each partition.

[0132] When performing local dimming through simulated local dimming, the contrast of the displayed image can be adjusted to further improve the display quality.

[0133] Specifically, the first display data is the display data with a grayscale value greater than or equal to a preset threshold, which can be understood as the display data of medium to high grayscale (wherein, medium and high grayscale can be further divided according to another larger preset threshold); the second display data is the display data with a grayscale value less than a preset threshold, which can be understood as the display data of low grayscale.

[0134] For display data of different gray levels, the brightness of low gray level display data (i.e., the second display data mentioned above) can be appropriately reduced, while the brightness of medium and high gray level display data (i.e., the first display data mentioned above) can be appropriately increased, thereby improving the contrast of the display screen.

[0135] Table 2 below shows examples of adjusting contrast by adjusting display brightness:

[0136] grayscale value grayscale type Initial display brightness Adjusted display brightness X1 low grayscale L0_x1 L1_x1(L0_x1>L1_x1) X2 Mid-grayscale L0_x2 L1_x2(L0_x1<L1_x1) X3 High grayscale L0_x3 L1_x3(L0_x1<L1_x1)

[0137] Table 2

[0138] In this embodiment, adjusting the brightness of different grayscale display data in each partition can help improve the contrast of the displayed image, thereby further improving the display quality.

[0139] In some embodiments, the controller is further configured to: if the display device does not enable local dimming function, determine the corresponding color temperature correction amount based on the power supply voltage / current of the backlight module, and perform color temperature correction processing based on the color temperature correction amount.

[0140] If the controller determines that the display device does not have local dimming function enabled, for example, the display device does not have local dimming function, or the display device has local dimming function but the function is not currently enabled, the controller can also perform global color temperature correction processing during the process of simulating dimming of the entire screen area.

[0141] It is understood that the principle of global color temperature correction is the same as that of color temperature correction for a single partition in the previous embodiment, and will not be repeated here.

[0142] Specifically, the processor can determine the color temperature correction amount corresponding to the overall display screen based on the overall power supply voltage / current of the backlight module, and perform color temperature correction processing on the overall screen based on the color temperature correction amount.

[0143] In this embodiment, when the display device does not have local dimming function enabled, the overall display quality can be improved by performing global color temperature correction.

[0144] In some embodiments, the controller is further configured to: if the display device does not support analog local dimming, adjust the power supply voltage / current of the backlight module according to the target brightness when the display data is displayed on the display module; wherein the power supply voltage / current of the backlight module corresponding to each local dimming zone is the same.

[0145] If the controller determines that the display device has enabled local dimming but does not support simulated local dimming, it means that the controller cannot perform dimming processing for each zone through simulated dimming. In this case, the controller can fix the display brightness of each zone, that is, the display brightness of each zone is the same.

[0146] Specifically, since the display device does not support simulated local dimming, in order to ensure that there is no screen flicker or water ripple phenomenon caused by phase difference, the controller can perform global synchronous dimming processing through simulated dimming. That is, according to the target brightness when the display data is displayed on the display module, the power supply voltage / current of the backlight module is adjusted; wherein, the power supply voltage / current of the backlight module corresponding to each zone is the same, so that the display brightness of each zone is also the same.

[0147] In this embodiment, for display devices that have enabled local dimming but do not support simulated local dimming, global synchronous dimming can be performed through simulated dimming, thereby avoiding screen flicker or water ripple effects caused by phase differences and improving display quality.

[0148] In some embodiments, the controller is further configured to: control the display device to turn off the local dimming function and turn off the image compensation function corresponding to the local dimming function.

[0149] If the controller determines that the display device has local dimming enabled but does not support analog local dimming, it means that the display device uses digital dimming, which adjusts brightness by changing the duty cycle of the PWM signal. In this case, when the controller dims via analog dimming, the dimming process may be interfered with by the vertical synchronization (Vsync) signal transmitted by the Serial Peripheral Interface (SPI), causing fine ripples to appear in large areas of solid color. Therefore, to avoid signal interference, the controller can control the display device to disable local dimming.

[0150] Meanwhile, to minimize the impact of local dimming on display quality, the corresponding image compensation function is also enabled when local dimming is activated on the display device. Therefore, after disabling local dimming, it is also necessary to disable the corresponding image compensation function to avoid its impact on the displayed image.

[0151] In this embodiment, if the display device has enabled the local dimming function but does not support simulated local dimming, the local dimming function and the image compensation function corresponding to the local dimming function can be turned off, thereby avoiding signal interference caused by local dimming to simulated dimming and improving display quality.

[0152] In some embodiments, the controller is further configured to: determine the corresponding color temperature correction amount based on the power supply voltage / power supply current of the backlight module, and perform color temperature correction processing based on the color temperature correction amount.

[0153] For display devices that have enabled local dimming but do not support simulated local dimming, after disabling local dimming and the corresponding image compensation function, the color temperature correction amount for the overall display screen can be determined based on the overall power supply voltage / current of the backlight module, and the overall screen color temperature correction processing can be performed based on the color temperature correction amount.

[0154] In this embodiment, after disabling the local dimming function and the image compensation function corresponding to the local dimming function, the overall display quality can be improved by performing global color temperature correction.

[0155] In some embodiments, a backlight module driving method is provided, which is applied to the display devices of the above embodiments.

[0156] Figure 12 This is a schematic diagram of the backlight module driving method provided in the embodiments of this application, as shown below. Figure 12 As shown, the method mainly includes the following steps:

[0157] S100. When the display device is detected to have entered the Variable Refresh Rate (VRR) mode, the dimming mode of the backlight module is adjusted to the analog dimming mode.

[0158] S200. Based on the target brightness displayed on the display module according to the display data, adjust the power supply voltage / current of the backlight module so that the backlight brightness provided by the backlight module is consistent with the target brightness.

[0159] In some embodiments, reference Figure 12 The methods also include:

[0160] S310. Determine whether the display device has enabled local dimming function;

[0161] S320. If the display device has enabled local dimming, determine whether the display device supports simulated local dimming.

[0162] S321. If the display device supports simulated local dimming, adjust the power supply voltage / current of the backlight module corresponding to each zone according to the target brightness of each zone when the display data is displayed on the display module.

[0163] In some embodiments, reference Figure 12 The method also includes: S322, determining the color temperature correction amount corresponding to each partition based on the power supply voltage / power supply current of the backlight module corresponding to each partition, and performing color temperature correction processing on each partition based on the color temperature correction amount.

[0164] In some embodiments, reference Figure 12 The method also includes: S323, increasing the target brightness corresponding to the first display data in each partition, and decreasing the target brightness corresponding to the second display data in each partition.

[0165] In some embodiments, reference Figure 12 The method also includes: S330, if the display device does not enable the local dimming function, then determine the corresponding color temperature correction amount according to the power supply voltage / power supply current of the backlight module, and perform color temperature correction processing based on the color temperature correction amount.

[0166] In some embodiments, reference Figure 12 The method also includes: S324, if the display device does not support analog local dimming, then adjust the power supply voltage / power supply current of the backlight module according to the target brightness when the display data is displayed on the display module; wherein, the power supply voltage / power supply current of the backlight module corresponding to each zone is the same.

[0167] In some embodiments, reference Figure 12 The method also includes: S325, controlling the display device to turn off the local dimming function, and turning off the image compensation function corresponding to the local dimming function.

[0168] In some embodiments, reference Figure 12 The method also includes: S326, determining the corresponding color temperature correction amount based on the power supply voltage / power supply current of the backlight module, and performing color temperature correction processing based on the color temperature correction amount.

[0169] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0170] In some embodiments, a computer device is provided, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of various method embodiments of the present application.

[0171] In some embodiments, a computer-readable storage medium is provided, wherein computer-executable instructions are stored therein, which, when executed by a processor, are used to implement the steps of various method embodiments of the present application.

[0172] In some embodiments, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of various method embodiments of the present application.

[0173] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0174] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0175] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A display device, characterized by comprising: The display comprises a display module and a backlight module, and the backlight module is configured to provide light sources with different backlight brightness to the display module so that the display module displays pictures with different display brightness. The controller connected with the display is configured to: adjust the dimming mode of the backlight module to an analog dimming mode when detecting that the display device enters a variable refresh rate (VRR) mode; adjust the supply voltage / supply current of the backlight module according to the target brightness of the display data when displayed on the display module, so that the backlight brightness of the light source provided by the backlight module is consistent with the target brightness; The controller is further configured to: determine whether the display device supports analog partition light control; if the display device supports analog partition light control, adjust the supply voltage / supply current of the backlight module corresponding to each partition according to the target brightness of the display data when displayed on the display module in each partition; The controller is further configured to: determine the color temperature correction amount corresponding to each partition according to the supply voltage / supply current of the backlight module corresponding to each partition, and perform color temperature correction processing of each partition based on the color temperature correction amount. The controller is further configured to: increase the target brightness of the first display data in each partition, and decrease the target brightness of the second display data in each partition; 2. The display device of claim 1, wherein, wherein the first display data is display data with a gray scale value greater than or equal to a preset threshold, and the second display data is display data with a gray scale value less than the preset threshold. The controller is further configured to: if the display device does not support analog partition light control, determine the corresponding color temperature correction amount according to the supply voltage / supply current of the backlight module, and perform color temperature correction processing based on the color temperature correction amount.

3. The display device of claim 1, wherein, The controller is further configured to: if the display device does not support analog partition light control, adjust the supply voltage / supply current of the backlight module according to the target brightness of the display data when displayed on the display module; 4. The display device of claim 1, wherein, wherein the supply voltage / supply current of the backlight module corresponding to each partition is the same. The controller is further configured to: control the display device to turn off the partition light control function and the image compensation function corresponding to the partition light control function.

5. The display device of claim 4, wherein, The controller is further configured to: determine the corresponding color temperature correction amount according to the supply voltage / supply current of the backlight module, and perform color temperature correction processing based on the color temperature correction amount.

6. The display device of claim 5, wherein, The display comprises a display module and a backlight module, and the backlight module is configured to provide light sources with different backlight brightness to the display module so that the display module displays pictures with different display brightness. The controller connected with the display is configured to:

7. A backlight module driving method, characterized in that, adjust the dimming mode of the backlight module to an analog dimming mode when detecting that the display device enters a variable refresh rate (VRR) mode; adjust the supply voltage / supply current of the backlight module according to the target brightness of the display data when displayed on the display module, so that the backlight brightness of the light source provided by the backlight module is consistent with the target brightness; The method further comprises: determine whether the display device supports analog partition light control; if the display device supports analog partition light control, adjust the supply voltage / supply current of the backlight module corresponding to each partition according to the target brightness of the display data when displayed on the display module in each partition; ​ If the display device supports analog partition dimming, the power supply voltage / power supply current of the backlight module corresponding to each partition is adjusted according to the target brightness of each partition when displaying the display data on the display module; The method further comprises: According to the power supply voltage / power supply current of the backlight module corresponding to each partition, the color temperature correction amount corresponding to each partition is determined, and color temperature correction processing of each partition is performed based on the color temperature correction amount.

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