Display apparatus, backlight control method, storage medium, and program product

Abstract

The invention belongs to the technical field of display, and provides a display device, a backlight control method, a storage medium and a program product, the display device comprises a display screen, a backlight unit and a processor, the backlight unit is divided into N backlight areas, the processor is configured to divide an image to be displayed into N subareas corresponding to the backlight area; obtaining backlight values of the N partitions and a backlight mean value of the N partitions; obtaining a first backlight mapping relation; adjusting the first backlight mapping relation according to the backlight mean value to obtain a second backlight mapping relation; according to the backlight values of the N subareas, the backlight mean value and the second backlight mapping relation, backlight control parameters corresponding to the N subareas are obtained, and when the image is displayed, backlight units of the corresponding backlight areas are controlled to emit light according to the backlight control parameters of the N subareas. In this way, the display effect can be effectively improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display. More particularly, it relates to a display device, a backlight control method, a storage medium and a program product. BACKGROUND

[0002] With the development of mini-LED liquid crystal televisions, in order to provide better picture quality experience for users, the dimming mode of backlight is converted from pulse width modulation (PWM) dimming to PWM and control current hybrid dimming.

[0003] In related technologies, when hybrid dimming is performed, the backlight data of an image can be converted into corresponding backlight control current and PWM value through a predefined mapping relationship table to achieve hybrid dimming of the backlight. However, this processing mode is single, the display effect is not good, and it is difficult to meet the needs of users. SUMMARY

[0004] Embodiments of the present application provide a display device, a backlight control method, a storage medium and a program product to improve the display effect and meet the use needs of users.

[0005] In a first aspect, embodiments of the present application provide a display device, which includes a display screen, a backlight unit and a processor, the processor is connected with the display screen and the backlight unit respectively; the display screen is used for image display, the backlight unit is divided into N backlight regions, and N is an integer greater than 1; the processor is configured to:

[0006] divide an image to be displayed into N partitions corresponding to the backlight regions;

[0007] obtain backlight values of the N partitions and backlight mean values of the N partitions;

[0008] obtain a first backlight mapping relationship; the first backlight mapping relationship is used to represent the mapping relationship between the backlight value and the backlight control current;

[0009] adjust the first backlight mapping relationship according to the backlight mean value to obtain a second backlight mapping relationship; the second backlight mapping relationship is used to represent the mapping relationship between the backlight value, the backlight mean value and the backlight control current;

[0010] obtain backlight control parameters corresponding to the N partitions respectively according to the backlight values of the N partitions, the backlight mean values and the second backlight mapping relationship, and control the backlight unit of the corresponding backlight region to emit light according to the backlight control parameters of the N partitions when the image is displayed.

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

[0012] introducing the backlight mean value as an independent variable of an added analytical expression of the first backlight mapping relationship into the analytical expression, to obtain the second backlight mapping relationship.

[0013] In some embodiments, the backlight control parameter includes a current parameter and a PWM parameter, and the processor is configured to:

[0014] convert the backlight control current into a corresponding current parameter;

[0015] obtain the PWM parameter according to the backlight control current and the current parameter.

[0016] In some embodiments, the processor is configured to:

[0017] obtain a preset backlight control current set;

[0018] select a target backlight control current greater than the backlight control current and having a minimum difference from the backlight control current from the backlight control current set as the current parameter.

[0019] In some embodiments, the processor is configured to:

[0020] obtain a preset upper limit value of the PWM, and a ratio of the backlight control current to the target backlight control current;

[0021] correct the preset upper limit value of the PWM according to the ratio to obtain the PWM parameter.

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

[0023] obtain a power control function corresponding to the backlight mean value;

[0024] adjust the second backlight mapping relationship according to the power control function, and obtain the backlight control parameter corresponding to each of the N partitions based on the adjusted second backlight mapping relationship, the backlight values of the N regions and the backlight mean value.

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

[0026] point-multiply the power control function with the second backlight mapping relationship to obtain the adjusted second backlight mapping relationship.

[0027] In a second aspect, the embodiments of the present application provide a backlight control method, applied to a display device, the display device comprising a display screen and a backlight unit; the display screen is configured to display images, and the backlight unit is divided into N backlight regions, where N is an integer greater than 1; the method comprises the following steps:

[0028] dividing an image to be displayed into N sub-regions corresponding to the backlight regions;

[0029] obtaining backlight values of the N sub-regions, and a backlight average value of the N sub-regions;

[0030] obtaining a first backlight mapping relationship; the first backlight mapping relationship is configured to represent a mapping relationship between a backlight value and a backlight control current;

[0031] adjusting the first backlight mapping relationship according to the backlight average value to obtain a second backlight mapping relationship; the second backlight mapping relationship is configured to represent a mapping relationship between a backlight value, a backlight average value and a backlight control current;

[0032] obtaining backlight control parameters corresponding to the N sub-regions respectively according to the backlight values of the N sub-regions, the backlight average value and the second backlight mapping relationship, and controlling the backlight unit of the corresponding backlight region to emit light according to the backlight control parameters of the N sub-regions when displaying the image.

[0033] In a third aspect, the present application provides a computer readable storage medium, the computer readable storage medium stores computer execution instructions, and the computer execution instructions are configured to implement the method of the second aspect when executed by a processor.

[0034] In a fourth aspect, the present application provides a computer program product, comprising a computer program, and the computer program is configured to implement the method of the second aspect when executed by a processor.

[0035] In a fifth aspect, the embodiments of the present application provide a chip, comprising a processor, and the processor is configured to call a computer program in a memory to execute the method of the second aspect.

[0036] The exemplary embodiments of the present application provide a display device, a backlight control method, a storage medium and a program product. The display device comprises a display screen, a backlight unit and a processor, the processor is connected with the display screen and the backlight unit respectively; the display screen is used for image display, the backlight unit is divided into N backlight regions, and N is an integer greater than 1; the processor is configured to divide an image to be displayed into N sub-regions corresponding to the backlight regions; obtain backlight values of the N sub-regions and backlight average values of the N sub-regions; obtain a first backlight mapping relationship; the first backlight mapping relationship is used to represent a mapping relationship between the backlight value and the backlight control current; adjust the first backlight mapping relationship according to the backlight average values to obtain a second backlight mapping relationship; the second backlight mapping relationship is used to represent a mapping relationship between the backlight value, the backlight average value and the backlight control current; obtain backlight control parameters corresponding to the N sub-regions respectively according to the backlight values of the N sub-regions, the backlight average values and the second backlight mapping relationship, and control the backlight unit of the corresponding backlight region to emit light according to the backlight control parameters of the N sub-regions when the image is displayed. In this way, different brightness can be displayed when the backlight values of a single sub-region are the same in different bright-dark scenes, thereby effectively improving the display effect. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0038] Figure 1 A display scene schematic diagram provided by an embodiment of the present application;

[0039] Figure 2 A structure schematic diagram of a display device provided by an embodiment of the present application;

[0040] Figure 3 A backlight processing process schematic diagram provided by an embodiment of the present application;

[0041] Figure 4 A flowchart of a backlight control method provided by an embodiment of the present application Figure 1 ;

[0042] Figure 5 A backlight mapping relationship schematic diagram provided by an embodiment of the present application;

[0043] Figure 6 A flowchart of a backlight control method provided by an embodiment of the present application Figure 2;

[0044] Figure 7 Flowchart of a backlight control method provided by an embodiment of the present application Figure 3 ;

[0045] Figure 8 Structure diagram of a backlight control device provided by the present application.

[0046] The specific embodiments of the present application have been shown by the above-mentioned drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0047] In order to make the purpose, embodiments and advantages of the present application more clear, the exemplary embodiments of the present application will be described clearly and completely below by combining the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0048] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the subsequently described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0049] In addition, the terms “include” and “have” and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not have to be limited to the clearly listed components, but can include other components that are not clearly listed or inherent to these products or devices.

[0050] For the convenience of understanding, first, a brief introduction is made to the part to which the embodiments of the present application are related:

[0051] Local dimming (local dimming) is a backlight technology used in televisions and displays to improve picture contrast and picture quality. The basic principle is to divide the backlight source into multiple independently controlled regions or blocks, and each block (called dimming area) can independently adjust the brightness according to the needs of the display content. This technology can reduce the brightness in areas that need to display deep black, and increase the brightness in areas that need to display bright details, so as to achieve better visual effects, for example, when displaying a night sky scene, the dimming area of the night sky will reduce the brightness, and the dimming area of the stars will maintain a higher brightness.

[0052] Hybrid dimming: a backlight dimming method that combines PWM dimming and direct current (DC) dimming, aiming to provide a wider dimming range and better dimming effect. This dimming method dynamically analyzes the picture brightness by intelligently adjusting the backlight system operating mode, thereby improving the picture quality without flicker, maintaining the details of black and white, improving the contrast, and realizing more realistic and dynamic image performance. Hybrid dimming mode can be realized by adjusting the LED current in the first half of dimming, at which time the color temperature consistency is good and the photoelectric efficiency is high; while in the second half of dimming, the LED current PWM duty cycle is adjusted by keeping the current peak value unchanged, so as to keep the color temperature unchanged, thereby realizing hybrid dimming.

[0053] Figure 1 A schematic diagram of a display device operation scene is provided for the embodiments of the present application. As shown in Figure 1 , a user can operate the display device 200 for display through the smart device 300 or the control device 100.

[0054] In some embodiments, the control device 100 can be a remote controller, and the communication between the remote controller and the display device includes infrared protocol communication or Bluetooth protocol communication, and other short-distance communication methods, to control the display device 200 through wireless or wired methods. The user can input user instructions through the keys on the remote controller, voice input, control panel input, etc., to control the display device 200.

[0055] In some embodiments, the smart device 300 (such as a mobile terminal, a tablet computer, a computer, a notebook computer, etc.) can also be used to control the display device 200. For example, an application running on the smart device is used to control the display device 200.

[0056] In some embodiments, the display device can not use the above-mentioned smart device or control device to receive instructions, but can receive user control through touch or gestures, etc.

[0057] In some embodiments, the display device 200 can also be controlled in ways other than the control device 100 and the smart device 300, for example, the user's voice instructions can be directly received by the module configured to obtain voice instructions inside the display device 200, or the user's voice instructions can be received through a voice control device set outside the display device 200.

[0058] In some embodiments, the display device 200 also communicates data with the server 400. The display device 200 can be allowed to be connected in communication through a local area network (LAN), a wireless local area network (WLAN), and other networks. The server 400 can provide various contents and interactions to the display device 200. The server 400 can be one cluster or multiple clusters, and can include one or more types of servers.

[0059] Figure 2 A possible hardware configuration of a display device 200 provided in the present application is shown in the figure. As shown in the figure, in some embodiments, the display device 200 can include 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 power supply 280, a memory 290, and a user interface 2100. Figure 2

[0060] In some embodiments, the controller includes a processor, a video processor, an audio processor, a graphics processor, a RAM, a ROM, a first interface to an n-th interface for input / output.

[0061] The display 260 includes a display screen component for presenting a picture, and a driving component for driving the image display, a component for receiving an image signal originating from the output of the controller, and displaying video content, image content, and a menu control interface, and a user control UI interface.

[0062] The display 260 can be a liquid crystal display, an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flex light-emitting diode (FLED), a Miniled, a MicroLed, a Micro-OLED, a quantum dot light emitting diode (QLED), and a projection display, etc., and can also be a projection device and a projection screen.

[0063] ​The communicator 220 is a component for communicating with external devices or servers according to various communication protocol types. For example, the communicator can include at least one of a WiFi module, a Bluetooth module, a wired Ethernet module, other network communication protocol chips or near field communication protocol chips, and an infrared receiver. The display device 200 can establish transmission and reception of control signals and data signals with the external control device 100 or the server 400 through the communicator 220.

[0064] The user interface 2100 can be used to receive control signals of the control device 100 (e.g., an infrared remote controller).

[0065] The detector 230 is used to collect signals of the external environment or interaction with the outside. For example, the detector 230 includes a light receiver for collecting ambient light intensity, or an image collector such as a camera for collecting external environmental scenes, user attributes or user interaction gestures, or a sound collector such as a microphone for receiving external sounds.

[0066] The external device interface 240 can include, but is not limited to, any one or more of the following: a high-definition multimedia interface (HDMI), an analog or digital high-definition component input interface (component), a composite video input interface (CVBS), a USB input interface (USB), an RGB port, etc. It can also be a composite input / output interface formed by the above multiple interfaces.

[0067] The tuner demodulator 210 receives broadcast television signals through wired or wireless reception, and demodulates audio and video signals and EPG data signals from multiple wireless or wired broadcast television signals.

[0068] In some embodiments, the controller 250 and the tuner demodulator 210 can be located in different split devices, i.e., the tuner demodulator 210 can also be in an external device of the main device where the controller 250 is located, such as an external set-top box, etc.

[0069] The controller 250 controls the operation of the display device and responds to user operations through various software control programs stored on the storage 290. The controller 250 controls the overall operation of the display device 200. For example, in response to receiving a user command for selecting a UI object displayed on the display 260, the controller 250 can perform an operation related to the object selected by the user command.

[0070] 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), a RAM (Random Access Memory), a ROM (Read-Only Memory), a first interface to an n-th interface for input / output, a communication bus, and the like.

[0071] The user can input a user command through a graphical user interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the graphical user interface (GUI). Alternatively, the user can input a user command by inputting a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through a sensor.

[0072] A "user interface" is a medium interface for interaction and information exchange between an application program or an operating system and a user, which realizes conversion between an internal form of information and a form acceptable by the user. A commonly used form of the user interface is a graphical user interface (GUI), which refers to a user interface related to computer operation displayed in a graphical manner. The graphical user interface can be an icon, a window, a control element, and the like interface elements displayed in a display screen of an electronic device, wherein the control element can include an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a widget, and the like visible interface elements.

[0073] The display device provided by the embodiments of the present application can have various implementation forms, for example, can be a smart television, a laser projection device, a monitor, an electronic bulletin board, an electronic table, and the like. Figure 1 And Figure 2 As a specific embodiment of the display device of the present application.

[0074] With the development of mini-LED liquid crystal televisions, in order to provide better picture quality experience for users, the backlight dimming mode is changed from single PWM dimming to DC+PWM hybrid dimming.

[0075] Figure 3 A schematic diagram of backlight modulation provided by the embodiments of the present application is as follows, Figure 3As shown, when the display device displays, the processor of the display device can obtain the video stream to be displayed, process the video stream, and extract image data and backlight data. The processor can send the image data to a screen driver (for example, a TCON board) to control the screen to display based on the image data. Meanwhile, the processor can convert the backlight data into control parameters (for example, DC values and PWM values) of the backlight source, and send the control parameters to the backlight driver (for example, a BCON board) to control the backlight driver to light up the backlight source, thereby providing backlight support for the screen to display the image.

[0076] Since the human eye does not perceive the brightness of the light source linearly, and under different brightness pictures, even if the local brightness value is the same, the human brain forms different feelings. For example, there is a picture of fireworks blooming in the night sky, and the user wants the fireworks part to be as bright as possible. For an image of a person's face in the sun, the user wants the brightness of the face part not to be too high, otherwise it will cause the face to overexpose.

[0077] When the display device using the LD technology displays the above two pictures, the processor of the display device can extract the backlight value of each partition in each picture, and query the control parameters (for example, DC values and PWM values) of the backlight source corresponding to the backlight value of each partition through a lookup table, and send the control parameters of the backlight source to the backlight driver to control the backlight source to emit light during the display process.

[0078] However, in the above two pictures, the backlight values of the partitions corresponding to the fireworks part and the face part may be the same, and the control parameters of the backlight source obtained by the lookup table will be the same, so that the brightness of the fireworks part and the face part is the same during the display process, resulting in poor display effect and difficulty in meeting the user's use demand.

[0079] Therefore, the display device and the backlight control method provided in the embodiments of the present application introduce the overall backlight value of the picture when obtaining the backlight control parameters of each partition based on the backlight value of each partition of the picture, so that different backlight control parameters can be obtained when the backlight value of a certain partition is the same in different pictures, thereby realizing that the same backlight value can correspond to different backlight brightness, and effectively improving the display effect of the picture.

[0080] The technical solutions of the present application will be described in detail in the following specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. In the description of the present application, unless otherwise explicitly specified and limited, each term should be understood in a broad sense in the art. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0081] The display device provided in the embodiments of the present application can include a display screen, a backlight unit and a processor. The backlight unit is divided into N (N is an integer greater than 1) backlight regions, each of which can be independently controlled by the processor to independently adjust the brightness according to the requirements of the display content. That is, the display device is a display device supporting local dimming function. The backlight control method provided in the embodiments of the present application can be applied to the processor of the display device. The backlight control method provided in the embodiments of the present application is described below with the processor as the execution subject. Figure 4 The backlight control method provided in the embodiments of the present application is described below with the processor as the execution subject.

[0082] Figure 4 The flowchart of the backlight control method provided in the embodiments of the present application is shown in FIG. 1, which includes the following steps. Figure 4

[0083] S401, dividing an image to be displayed into N sub-regions corresponding to the backlight regions.

[0084] In some embodiments, the processor can divide the image into N image sub-regions corresponding to the N backlight regions according to the N backlight regions of the backlight unit, and each backlight region can provide backlight support for the image of the corresponding sub-region during the display process.

[0085] S402, obtaining the backlight values of the N sub-regions and the backlight average value of the N sub-regions.

[0086] In some embodiments, the processor can perform statistics on the pixel gray scale values in each sub-region, and determine the backlight value of each sub-region based on the statistical result. For example, for sub-region 1, the processor can take the average of the gray scales of the pixels in sub-region 1 as the backlight value of the sub-region, or take the highest gray scale value among the gray scale values of the pixels in sub-region 1 as the backlight value of the sub-region, or take the median of the gray scale values of the pixels in sub-region 1 as the backlight value of the sub-region. The embodiments of the present application do not limit this.

[0087] After the processor obtains the backlight values of the sub-regions, the processor can calculate the average of the backlight values of the sub-regions to obtain the backlight average value.

[0088] S403, obtaining a first backlight mapping relationship; the first backlight mapping relationship is used to represent the mapping relationship between the backlight value and the backlight control current.

[0089] In some embodiments, the first backlight mapping relationship is predefined in the processor or in the memory of the display device, and the processor can read the first backlight mapping relationship from the memory.

[0090] ​In some embodiments, the first backlight mapping relationship can be in the form of a function, a table, a graph, a matrix, a dictionary, a mapping table, etc., which is not limited in the embodiments of the present application.

[0091] As shown in the figure, the first backlight mapping relationship is in the form of a curve, through which the corresponding backlight control current (value) can be obtained based on the backlight value. Figure 5

[0092] S404, adjusting the first backlight mapping relationship according to the backlight average value to obtain a second backlight mapping relationship; the second backlight mapping relationship is used to represent the mapping relationship between the backlight value, the backlight average value and the backlight control current.

[0093] In some embodiments, in order to make the picture partition with the same backlight value present different brightness in different light and dark scenes (e.g., different pictures), the processor can adjust the first backlight mapping relationship according to the backlight average value of the picture, so that different pictures correspond to different second backlight mapping relationships.

[0094] For example, when the first backlight mapping relationship is not a function relationship, the processor can use a preset fitting tool to fit the first backlight mapping relationship to obtain an analytical expression (also called a function expression) of the first backlight mapping relationship.

[0095] For example, the analytical expression of the first backlight mapping relationship can be as follows:

[0096] Current = F(backlight)

[0097] Wherein, Current is the backlight control current, backlight is the backlight value, and F is the corresponding expression.

[0098] When the processor obtains the analytical expression of the first backlight mapping relationship, the processor can introduce the backlight average value as a new independent variable into the analytical expression to modify the first backlight mapping relationship and obtain the second backlight mapping relationship.

[0099] For example, the second backlight mapping relationship can be as follows:

[0100] Current = F(backlight, APL)

[0101] Wherein, the APL is the backlight average value.

[0102] It should be understood that, if the first backlight mapping relationship is a function relationship, the processor can directly introduce the backlight average value as a new independent variable into the function to modify the first backlight mapping relationship and obtain the second backlight mapping relationship.

[0103] ​S405, according to the backlight value of the N partitions, the backlight average value and the second backlight mapping relationship, the backlight control parameter corresponding to each of the N partitions is obtained, and when the image is displayed, the backlight unit of the corresponding backlight area is controlled to emit light according to the backlight control parameter of the N partitions.

[0104] In some embodiments, when the processor obtains the second backlight mapping relationship, the backlight value and the backlight average value of each partition of the to-be-displayed picture can be brought into the second backlight mapping relationship to obtain the backlight control current corresponding to each partition.

[0105] For example, the first backlight mapping relationship is a linear mapping relationship, and the analytical expression of the first backlight mapping relationship can be:

[0106] Current = F(backlight)=k*backlight

[0107] Wherein, k is the slope of the straight line.

[0108] For a picture, the backlight average value is fixed, and then the backlight average value is introduced into the analytical expression of the first mapping relationship, and the second backlight mapping relationship can be:

[0109] Current = F(backlight,APL)= K(APL)*backlight

[0110] Wherein, K(APL) can be the corresponding relationship between the slope k and APL, and K(APL) can be predefined in the processor.

[0111] In the second mapping relationship, different backlight average values correspond to different slope values, so that different bright and dark scenes correspond to different second backlight mapping relationships.

[0112] In some embodiments, when the processor obtains the backlight control current corresponding to each partition, the backlight control current of each partition can be converted into the corresponding backlight control parameter (for example, DC value and PWM value), and the backlight control parameter is sent to the control drive of the backlight source, so that the control drive of the backlight source controls the backlight unit of the corresponding backlight area to emit light according to the backlight control parameter of the N partitions when the image is displayed.

[0113] The backlight control method provided in the embodiments of the present application includes the following steps: dividing an image to be displayed into N sub-regions corresponding to backlight regions; obtaining backlight values of the N sub-regions and backlight average values of the N sub-regions; obtaining a first backlight mapping relationship, which is used to represent a mapping relationship between a backlight value and a backlight control current; adjusting the first backlight mapping relationship according to the backlight average values to obtain a second backlight mapping relationship, which is used to represent a mapping relationship between a backlight value, a backlight average value and a backlight control current; obtaining backlight control parameters corresponding to the N sub-regions respectively according to the backlight values of the N sub-regions, the backlight average values and the second backlight mapping relationship; and controlling the backlight units of the corresponding backlight regions to emit light according to the backlight control parameters of the N sub-regions when the image is displayed. When the sub-regions of the image are processed, the backlight average values of the image are introduced, so that different brightness can be displayed in different light and dark scenes when the backlight values of the sub-regions are the same, thereby effectively improving the display effect.

[0114] On the basis of the above embodiments, the following will be described in combination with Figure 6 The process of converting the backlight control current into the corresponding backlight control parameter provided in the embodiments of the present application will be further described.

[0115] Figure 6 The flowchart of the backlight control method provided in the embodiments of the present application is shown in Figure 2 As shown in Figure 6 , it includes the following steps:

[0116] S601, converting the backlight control current into a corresponding current parameter.

[0117] In some embodiments, when the processor obtains the backlight control current corresponding to each sub-region, the backlight control current can be converted into a corresponding current parameter (DC value) in the following manner.

[0118] In a possible implementation, the processor is preconfigured with a mapping relationship between the backlight control current and the current parameter, and the processor can obtain the DC value corresponding to each sub-region based on the mapping relationship.

[0119] In another possible implementation, the processor obtains a preset backlight control current set; selects a target backlight control current greater than the backlight control current and having the minimum difference from the backlight control current from the backlight control current set as the current parameter. The backlight control current set can be defined in a register of the processor or in a memory of the display device.

[0120] For example, if the backlight control current set is (0.5, 1, 1.5, 2, 2.5, 3), and the processor obtains a backlight control current of 1.3 based on the second backlight mapping relationship, it can select a target backlight control current of 1.5 that is greater than 1.3 and closest to 1.3 from the set of backlight control currents as the corresponding current parameter (DC value).

[0121] S602. Obtain the PWM parameters based on the backlight control current and the current parameters.

[0122] In some embodiments, when the processor obtains the current parameters, it can determine the PWM parameters based on the following method:

[0123] For example, a preset upper limit value of the PWM is obtained, as well as the ratio of the backlight control current to the target backlight control current; the preset upper limit value of the PWM is corrected according to the ratio to obtain the PWM parameters.

[0124] The upper limit value of the PWM (maximum PWM value) is preset by the display device and can be stored in the memory or RAM of the display device. The processor can read this value from it.

[0125] In some embodiments, the PWM parameters (values) can satisfy the following formula:

[0126] PWM = (Current / DC value) * PWM upper limit value.

[0127] Where Current is the backlight control current, and DC is the target backlight control current (current parameter).

[0128] Based on the above embodiments, when obtaining the backlight control current based on the second backlight mapping relationship, in order to prevent excessive backlight power and unnecessary power waste in the display device, and to ensure power stability and that the power does not exceed the maximum power value in all scenarios, it is also necessary to limit the power of the second backlight current mapping relationship. The following is in conjunction with... Figure 7 The process will be explained.

[0129] Figure 7 Flowchart of the backlight control method provided in the embodiments of this application Figure 3 ,like Figure 7 As shown, it includes:

[0130] S701. Obtain the power control function corresponding to the average backlight value.

[0131] In some embodiments, the power control function corresponding to the average backlight value is predefined in the memory or register of the display device. The processor can read the power control function from there.

[0132] For example, the power control function can be as follows:

[0133] power=G(APL)

[0134] It should be understood that the expression corresponding to the power control function G can be set according to actual experience, and embodiments of the present application do not limit this. For example, G(APL)=h*APL, where h is a proportional coefficient.

[0135] S702, adjusting the second backlight mapping relationship according to the power control function, and obtaining the backlight control parameters corresponding to each of the N partitions based on the adjusted second backlight mapping relationship, the backlight values of the N regions and the backlight average value.

[0136] In some embodiments, the processor adjusts the second backlight mapping relationship according to the power control function, which can be in the following manner:

[0137] In one possible implementation, the power control function is point multiplied with the second backlight mapping relationship to obtain the adjusted second backlight mapping relationship.

[0138] For example, the adjusted second backlight mapping relationship can be as follows:

[0139] Current=F(backlight,APL)*G(APL)

[0140] That is, the F function is scaled by the G function to adjust the backlight control current based on the second backlight mapping relationship, thereby controlling the power.

[0141] In one possible implementation, the adjusted second backlight mapping relationship can be as follows:

[0142] Current=F(backlight,APL)*(1+G(APL))

[0143] That is, the F function is controlled to move up and down by the G function to adjust the backlight control current based on the second backlight mapping relationship, thereby controlling the power.

[0144] When the processor obtains the adjusted second backlight mapping relationship, it can obtain the control current of each partition based on the adjusted second backlight mapping relationship, and convert the control current of each partition into the corresponding backlight control parameters (DC value and PWM value). In the display process, the backlight source of the corresponding backlight region is controlled to emit light according to the backlight control parameters of each partition. The specific implementation can refer to the specific implementation of the embodiments of the display device shown in the above Figure 4 and Figure 6 The specific implementation is not described here.

[0145] The embodiment of the present application adjusts the second backlight mapping function through the power control function, and obtains the backlight control parameters corresponding to each partition based on the adjusted second backlight mapping function, so that different luminances can be displayed under different bright-dark scenes when the backlight values of a single partition are the same, and the power of the display device is stable, and the power consumption of the display device is reduced.

[0146] On the basis of the above embodiment, the embodiment of the present application further provides a backlight control device, which is applied to the processor of the display device in any of the above embodiments.

[0147] Figure 8 The structural schematic diagram of the backlight control device 80 provided by the embodiment of the present application is shown in FIG. 8, which includes: Figure 8

[0148] The first processing module 801 is configured to divide an image to be displayed into N partitions corresponding to the backlight regions.

[0149] The first obtaining module 802 is configured to obtain backlight values of the N partitions and backlight mean values of the N partitions.

[0150] The second obtaining module 803 is configured to obtain a first backlight mapping relationship; the first backlight mapping relationship is used to represent a mapping relationship between a backlight value and a backlight control current.

[0151] The second processing module 804 is configured to adjust the first backlight mapping relationship according to the backlight mean values, to obtain a second backlight mapping relationship; the second backlight mapping relationship is used to represent a mapping relationship between a backlight value, a backlight mean value and a backlight control current.

[0152] The control module 805 is configured to obtain backlight control parameters corresponding to the N partitions respectively according to the backlight values of the N partitions, the backlight mean values and the second backlight mapping relationship, and control the backlight units of the corresponding backlight regions to emit light according to the backlight control parameters of the N partitions when the image is displayed.

[0153] In some embodiments, the second processing module 804 is further configured to introduce the backlight mean values as new independent variables of an analytic expression corresponding to the first backlight mapping relationship into the analytic expression, to obtain the second backlight mapping relationship.

[0154] In some embodiments, the backlight control parameters include current parameters and PWM parameters, and the control module 805 is further configured to convert the backlight control current into corresponding current parameters; and obtain the PWM parameters according to the backlight control current and the current parameters.

[0155] ​In some embodiments, the control module 805 is further configured to obtain a preset set of backlight control currents; select, from the set of backlight control currents, a target backlight control current that is greater than the backlight control current and has a minimum difference from the backlight current as the current parameter.

[0156] In some embodiments, the control module 805 is further configured to obtain a preset upper limit value of the PWM, and a ratio of the backlight control current and the target backlight control current; and correct the preset upper limit value of the PWM according to the ratio to obtain the PWM parameter.

[0157] In some embodiments, the second processing module 804 is further configured to obtain a power control function corresponding to the backlight average value; adjust the second backlight mapping relationship according to the power control function, and obtain the backlight control parameters corresponding to the N partitions respectively based on the adjusted second backlight mapping relationship, the backlight values of the N regions, and the backlight average value.

[0158] In some embodiments, the second processing module 804 is further configured to point-multiply the power control function and the second backlight mapping relationship to obtain the adjusted second backlight mapping relationship.

[0159] The backlight control device provided in the present application is used to execute the backlight control method provided in any of the above embodiments, and has similar implementation principles and technical effects, which will not be described herein.

[0160] It should be noted that the division of each module of the above device is only a logical function division, and all or part of the actual implementation can be integrated into one physical entity, or can be physically separated. These modules can all be implemented in the form of software called by a processing element; all can be implemented in the form of hardware; some modules can be implemented in the form of software called by a processing element, and some modules can be implemented in the form of hardware. Each module can be a separate processing element, or can be integrated in a chip of the above device, in addition, the functions of each module can be stored in the memory of the above device in the form of program code, and called and executed by a processing element of the above device. In addition, all or part of these modules can be integrated together, or can be independently implemented. The processing element here can be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each module can be completed by the integrated logic circuit of hardware or the instruction of software in the processing element.

[0161] The present application also provides a computer readable storage medium, which stores computer execution instructions, and when a processor executes the computer execution instructions, the above backlight control method is implemented.

[0162] The above-mentioned readable storage medium can be realized by any type of volatile or nonvolatile storage devices or their combinations, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0163] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0164] The division of units is only a logical function division, and in actual implementation, there can be another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0165] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment.

[0166] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0167] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the method of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0168] It can be understood by those skilled in the art that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various media that can store program codes.

[0169] Finally, it should be noted that: those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application that follow the general principles of the present application and include common knowledge or conventional technical means in the art that are not disclosed in the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A display device, characterized in that, The display device includes: a display screen, a backlight unit, and a processor, wherein the processor is connected to the display screen and the backlight unit respectively; the display screen is used for displaying images, and the backlight unit is divided into N backlight areas, where N is an integer greater than 1; the processor is configured to: The image to be displayed is divided into N partitions corresponding to the backlight area; Obtain the backlight values ​​of the N partitions, and the average backlight value of the N partitions; Obtain the first backlight mapping relationship; the first backlight mapping relationship is used to characterize the mapping relationship between the backlight value and the backlight control current; Based on the backlight average value, the first backlight mapping relationship is adjusted to obtain a second backlight mapping relationship; the second backlight mapping relationship is used to characterize the mapping relationship between the backlight value, the backlight average value and the backlight control current. Based on the backlight values ​​of the N partitions, the average backlight value, and the second backlight mapping relationship, the backlight control parameters corresponding to each of the N partitions are obtained, and when displaying the image, the backlight units of the corresponding backlight areas are controlled to emit light according to the backlight control parameters of the N partitions.

2. The display device according to claim 1, characterized in that, The processor is configured to: The mean backlight value is introduced as a new independent variable into the analytical expression corresponding to the first backlight mapping relationship to obtain the second backlight mapping relationship.

3. The display device according to claim 2, characterized in that, The backlight control parameters include current parameters and PWM parameters, and the processor is configured to: Convert the backlight control current into corresponding current parameters; The PWM parameters are obtained based on the backlight control current and the current parameters.

4. The display device according to claim 3, characterized in that, The processor is configured to: Obtain the preset set of backlight control currents; Select the target backlight control current that is greater than the backlight control current and has the smallest difference from the backlight current from the set of backlight control currents as the current parameter.

5. The display device according to claim 4, characterized in that, The processor is configured to: Obtain the preset upper limit value of the PWM, and the ratio of the backlight control current to the target backlight control current; The preset upper limit of the PWM is corrected based on the ratio to obtain the PWM parameters.

6. The display device according to any one of claims 1-5, characterized in that, The processor is configured to: Obtain the power control function corresponding to the average backlight value; The second backlight mapping relationship is adjusted according to the power control function, and the backlight control parameters corresponding to each of the N partitions are obtained based on the adjusted second backlight mapping relationship, the backlight values ​​of the N regions and the backlight average value.

7. The display device according to claim 6, characterized in that, The processor is configured to: The adjusted second backlight mapping relationship is obtained by multiplying the power control function with the second backlight mapping relationship.

8. A backlight control method, characterized in that, Applied to a display device, the display device including a display screen and a backlight unit; The display screen is used for image display, and the backlight unit is divided into N backlight areas, where N is an integer greater than 1; the method includes: The image to be displayed is divided into N partitions corresponding to the backlight area; Obtain the backlight values ​​of the N partitions, and the average backlight value of the N partitions; Obtain the first backlight mapping relationship; the first backlight mapping relationship is used to characterize the mapping relationship between the backlight value and the backlight control current; Based on the backlight average value, the first backlight mapping relationship is adjusted to obtain a second backlight mapping relationship; the second backlight mapping relationship is used to characterize the mapping relationship between the backlight value, the backlight average value and the backlight control current. Based on the backlight values ​​of the N partitions, the average backlight value, and the second backlight mapping relationship, the backlight control parameters corresponding to each of the N partitions are obtained, and when displaying the image, the backlight units of the corresponding backlight areas are controlled to emit light according to the backlight control parameters of the N partitions.

9. A storage medium, characterized in that, The storage medium stores computer execution instructions, which, when executed by a processor, are used to implement the method as described in claim 8.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method of claim 8.

Images