Dynamic contrast ratio determination method and display device

Abstract

The embodiment of the present application provides a method for determining dynamic contrast and a display device. Before the display screen displays an image, an image data signal inputted into the display screen is obtained to determine whether there is a black display area in the image to be displayed corresponding to the image data signal. When there is a black display area, the target display area occupied by the black display area in the image to be displayed is determined, and then the dynamic contrast of the display screen is determined based on the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed. That is, in the embodiment of the present application, when the edge of the image to be displayed contains a concentrated black edge distribution area, the dynamic contrast is determined only based on the brightness information of each pixel in the effective display area of ​​the image to be displayed by eliminating the black display area in the image to be displayed, so that the determined dynamic contrast is not affected by the brightness of the pixels in the black display area, and thus has higher accuracy.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on September 11, 2020, with application number 202010955661.5 and application name “Dynamic Contrast Determination Method and Display Device”, the entire contents of which are incorporated by reference in this application. Technical Field

[0002] Embodiments of the present application relate to the field of image processing technology, and in particular, to a method for determining a dynamic contrast ratio and a display device. Background Art

[0003] With the popularization of applications such as online video software, Internet Protocol Television (IPTV), and online players, the number of users watching on-demand movies or online live videos through display devices has increased significantly.

[0004] Currently, when display devices determine the dynamic contrast of the display screen, they usually determine it based on the brightness of all display pixels in the display screen. For various display devices, the greater the contrast, the clearer and more eye-catching the displayed image, and the brighter the color. High contrast is also very helpful for image clarity, detail expression, grayscale expression, etc.

[0005] However, when the aspect ratio of the effective area of ​​the video image played by the display device is different from the aspect ratio of the display device output signal, the display device may achieve aspect conversion by means of black borders. For example, the aspect ratio of movies is mostly 21:9, and the aspect ratio of some radio and television programs is 4:3. When the display device outputs movies with an aspect ratio of 16:9, black borders will appear on the top and bottom or left and right of the displayed image, which will cause the dynamic contrast determined by the display device to be lower than the ideal dynamic contrast, thereby affecting the playback effect. Summary of the invention

[0006] The embodiments of the present application provide a method for determining a dynamic contrast ratio and a display device, which can solve the technical problem that the current display device has a low accuracy in determining a dynamic contrast ratio.

[0007] In a first aspect, an embodiment of the present application provides a display device, the display device comprising:

[0008] Display screen, used to display images.

[0009] A controller in communication with the display screen, the controller being configured to:

[0010] Acquire an image data signal inputted into the display screen, and determine whether there is a black display area in the image to be displayed corresponding to the image data signal;

[0011] When there is a black display area in the image to be displayed, determining a target display area occupied by the black display area in the image to be displayed;

[0012] The dynamic contrast ratio of the display screen is determined according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed.

[0013] In a second aspect, an embodiment of the present application provides a method for determining a dynamic contrast ratio, the method comprising:

[0014] Acquire an image data signal inputted into the display screen, and determine whether there is a black display area in the image to be displayed corresponding to the image data signal;

[0015] When there is a black display area in the image to be displayed, determining a target display area occupied by the black display area in the image to be displayed;

[0016] The dynamic contrast ratio of the display screen is determined according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed.

[0017] The dynamic contrast determination method and display device provided in the embodiment of the present application obtain the image data signal inputted into the display screen before the display screen displays the image, determine whether there is a black display area in the image to be displayed corresponding to the image data signal, and when there is a black display area, determine the target display area occupied by the black display area in the image to be displayed, and then determine the dynamic contrast of the display screen according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed. That is, in the embodiment of the present application, when the edge of the image to be displayed contains a concentrated black edge distribution area, the dynamic contrast is determined only according to the brightness information of each pixel in the effective display area of ​​the image to be displayed by eliminating the black display area in the image to be displayed, so that the determined dynamic contrast is not affected by the brightness of the pixels in the black display area, and thus has higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 Schematic diagram of an operation scenario between a display device and a control device according to some embodiments is exemplarily shown in FIG.

[0020] Figure 2exemplarily shows a hardware configuration block diagram of a display device 200 according to some embodiments;

[0021] Figure 3 exemplarily shows a schematic diagram of an icon control interface display of an application in a display device 200 according to some embodiments;

[0022] Figure 4 exemplarily shows a schematic diagram of displaying a black display area in a display screen according to some embodiments;

[0023] Figure 5a and Figure 5b exemplarily shows a display schematic diagram of a first detection area in a display screen according to some embodiments;

[0024] Figure 6 A flow chart of a method for determining a dynamic contrast ratio is exemplarily shown in FIG. DETAILED DESCRIPTION

[0025] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0026] Based on the exemplary embodiments described in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the claims attached to this application. In addition, although the disclosure in this application is introduced according to one or several exemplary examples, it should be understood that each aspect of the disclosure can also constitute a complete implementation method separately.

[0027] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0028] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise indicated. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, for example, they can be implemented according to orders other than those given in the diagrams or descriptions of the embodiments of this application.

[0029] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0030] Figure 1 FIG. 2 is a schematic diagram showing an operation scenario between a display device and a control device according to an embodiment. Figure 1 As shown in FIG. 1 , a user can operate the display device 200 through the mobile terminal 300 and the control apparatus 100 .

[0031] In some embodiments, the control device 100 may 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-range communication methods, etc., to control the display device 200 wirelessly or in a wired manner. The user may input user commands through buttons on the remote controller, voice input, control panel input, etc. to control the display device 200. For example, the user may input corresponding control commands through the volume plus and minus keys, channel control keys, up / down / left / right movement keys, voice input keys, menu keys, power on / off keys, etc. on the remote controller to realize the function of controlling the display device 200.

[0032] In some embodiments, a mobile terminal, a tablet computer, a computer, a laptop computer, and other smart devices may 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. The application may be configured to provide the user with various controls in an intuitive user interface (UI) on a screen associated with the smart device.

[0033] In some embodiments, the mobile terminal 300 can install software applications with the display device 200, and realize connection and communication through a network communication protocol to achieve the purpose of one-to-one control operation and data communication. For example, it is possible to establish a control instruction protocol with the mobile terminal 300 and synchronize the remote control keyboard to the mobile terminal 300, and realize the function of controlling the display device 200 by controlling the user interface on the mobile terminal 300. It is also possible to transmit the audio and video content displayed on the mobile terminal 300 to the display device 200 to realize the synchronous display function.

[0034] like Figure 1It is also shown that the display device 200 also communicates data with the server 400 through various communication methods. The display device 200 may be allowed to communicate and connect via a local area network (LAN), a wireless local area network (WLAN), and other networks. The server 400 may provide various content and interactions to the display device 200. For example, the display device 200 receives software program updates or accesses a remotely stored digital media library by sending and receiving information and interacting with an electronic program guide (EPG). The server 400 may be a cluster or multiple clusters, and may include one or more types of servers. Other network service content such as video on demand and advertising services is provided through the server 400.

[0035] The display device 200 may be a liquid crystal display, an OLED display, or a projection display device. The specific display device type, size, and resolution are not limited. It is understood by those skilled in the art that the display device 200 may be modified in performance and configuration as required.

[0036] In addition to providing the broadcast receiving television function, the display device 200 may also provide an intelligent network television function with computer support functions, including but not limited to network television, smart television, Internet Protocol television (IPTV), etc.

[0037] Figure 2 Schematically shows a hardware configuration block diagram of a display device 200 according to an exemplary embodiment.

[0038] In some embodiments, the display device 200 includes at least one of a controller 250, a tuner and demodulator 210, a communicator 220, a detector 230, an input / output interface 255, a display screen 275, an audio output interface 285, a memory 260, a power supply 290, a user interface 265, and an external device interface 240.

[0039] In some embodiments, the display screen 275 is a component for receiving the image signal outputted from the first processor and displaying video content and images as well as a menu control interface.

[0040] In some embodiments, the display screen 275 includes a display screen component for presenting images and a driving component for driving image display.

[0041] In some embodiments, the displayed video content may be from broadcast television content, or may be various broadcast signals received through wired or wireless communication protocols, or may be from various image content sent from a network server via a network communication protocol.

[0042] In some embodiments, the display screen 275 is used to present a user manipulation UI interface generated in the display device 200 and used to control the display device 200 .

[0043] In some embodiments, depending on the type of display screen 275, a driving component for driving the display is also included.

[0044] In some embodiments, the display screen 275 is a projection display screen, and may also include a projection device and a projection screen.

[0045] In some embodiments, the communicator 220 is a component for communicating with an external device or an external server according to various communication protocol types. For example, the communicator may include at least one of a Wifi chip, a Bluetooth communication protocol chip, a wired Ethernet communication protocol chip, other network communication protocol chips or a near field communication protocol chip, and an infrared receiver.

[0046] In some embodiments, the display device 200 may establish transmission and reception of control signals and data signals with the external control device 100 or the content providing device through the communicator 220 .

[0047] In some embodiments, the user interface 265 may be used to receive infrared control signals from the control device 100 (eg, an infrared remote controller, etc.).

[0048] In some embodiments, the detector 230 is a signal used by the display device 200 to collect external environment or interact with the outside.

[0049] In some embodiments, the detector 230 includes a light receiver, a sensor for collecting ambient light intensity, and can adaptively display parameter changes by collecting ambient light.

[0050] In some embodiments, the detector 230 may also include an image collector, such as a camera, a webcam, etc., which can be used to collect external environment scenes, as well as to collect user attributes or gestures for interacting with the user. It can adaptively change display parameters and recognize user gestures to achieve the function of interacting with the user.

[0051] In some embodiments, the detector 230 may also include a temperature sensor or the like, such as by sensing the ambient temperature.

[0052] In some embodiments, the display device 200 can adaptively adjust the display color temperature of the image. For example, when the temperature is high, the display device 200 can be adjusted to display a cooler color temperature of the image, or when the temperature is low, the display device 200 can be adjusted to display a warmer color temperature of the image.

[0053] In some embodiments, the detector 230 may also be a sound collector, such as a microphone, which can be used to receive the user's voice, for example, including a voice signal of a control instruction of the user to control the display device 200, or collect environmental sounds to identify the type of environmental scene, so that the display device 200 can adaptively adapt to the environmental noise.

[0054] In some embodiments, Figure 2 As shown, the input / output interface 255 is configured to perform data transmission between the controller 250 and other external devices or other controllers 250, such as receiving video signal data and audio signal data, or command instruction data from external devices.

[0055] In some embodiments, the external device interface 240 may include, but is not limited to, any one or more interfaces such as a high-definition multimedia interface HDMI interface, an analog or digital high-definition component input interface, a composite video input interface, a USB input interface, an RGB port, etc. It is also possible that the above multiple interfaces form a composite input / output interface.

[0056] In some embodiments, Figure 2 As shown, the tuner-demodulator 210 is configured to receive broadcast television signals through wired or wireless reception, and can perform modulation and demodulation processing such as amplification, mixing and resonance, and demodulate audio and video signals from multiple wireless or wired broadcast television signals. The audio and video signals may include television audio and video signals carried in the television channel frequency selected by the user, as well as EPG data signals.

[0057] In some embodiments, the frequency demodulated by the tuner-demodulator 210 is controlled by the controller 250, which can send a control signal based on the user's selection to make the modem respond to the TV signal frequency selected by the user and modulate and demodulate the TV signal carried by the frequency.

[0058] In some embodiments, the broadcast television signal can be classified into terrestrial broadcast signals, cable broadcast signals, satellite broadcast signals, or Internet broadcast signals according to different broadcasting formats of the television signal. Or it can be classified into digital modulation signals, analog modulation signals, etc. according to different modulation types. Or it can be classified into digital signals, analog signals, etc. according to different signal types.

[0059] In some embodiments, the controller 250 and the tuner-demodulator 210 may be located in different separate devices, that is, the tuner-demodulator 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. In this way, the set-top box outputs the TV audio and video signals modulated and demodulated from the received broadcast TV signals to the main device, and the main device receives the audio and video signals through the first input / output interface.

[0060] 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 the memory. The controller 250 can control the overall operation of the display device 200. For example, in response to receiving a user command for selecting a UI object to be displayed on the display screen 275, the controller 250 can perform operations related to the object selected by the user command.

[0061] like Figure 2 As shown, the controller 250 includes at least one of a random access memory 251 (Random Access Memory, RAM), a read-only memory 252 (Read-Only Memory, ROM), a video processor 270, an audio processor 280, other processors 253 (for example: a graphics processor (Graphics Processing Unit, GPU), a central processing unit 254 (Central Processing Unit, CPU), a communication interface (Communication Interface), and a communication bus 256 (Bus). Among them, the communication bus connects various components.

[0062] In some embodiments, RAM 251 is used to store temporary data for the operating system or other running programs.

[0063] In some embodiments, ROM 252 is used to store various system startup instructions.

[0064] In some embodiments, ROM 252 is used to store a basic input / output system, called Basic Input Output System (BIOS), which is used to complete the power-on self-test of the system, the initialization of each functional module in the system, the basic input / output driver of the system, and the booting of the operating system.

[0065] In some embodiments, when a power-on signal is received, the display device 200 starts to power on, and the CPU runs the system startup instruction in the ROM 252, and copies the temporary data of the operating system stored in the memory to the RAM 251, so as to start or run the operating system. After the operating system is started, the CPU copies the temporary data of various application programs in the memory to the RAM 251, so as to start or run various application programs.

[0066] In some embodiments, the CPU processor 254 is used to execute operating system and application instructions stored in the memory, and to execute various applications, data and content according to various interactive instructions received from external input, so as to finally display and play various audio and video contents.

[0067] In some exemplary embodiments, the CPU processor 254 may include multiple processors. The multiple processors may include a main processor and one or more sub-processors. The main processor is used to perform some operations of the display device 200 in the pre-power-on mode and / or the operation of displaying the picture in the normal mode. The one or more sub-processors are used for an operation in the standby mode and the like.

[0068] In some embodiments, the graphics processor 253 is used to generate various graphic objects, such as icons, operation menus, and user input command display graphics, etc. It includes an operator, which performs operations by receiving various interactive instructions input by the user and displays various objects according to display attributes. It also includes a renderer, which renders various objects obtained based on the operator, and the rendered objects are used to be displayed on the display screen.

[0069] In some embodiments, the video processor 270 is configured to receive an external video signal and perform video processing such as decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, image synthesis, etc. according to the standard codec protocol of the input signal, and obtain a signal that can be directly displayed or played on the display device 200.

[0070] In some embodiments, the video processor 270 includes a demultiplexing module, a video decoding module, an image synthesis module, a frame rate conversion module, a display formatting module, etc.

[0071] Among them, the demultiplexing module is used to demultiplex the input audio and video data stream. For example, if MPEG-2 is input, the demultiplexing module demultiplexes it into video signals and audio signals.

[0072] The video decoding module is used to process the demultiplexed video signal, including decoding and scaling.

[0073] The image synthesis module, such as an image synthesizer, is used to superimpose and mix the GUI signal generated by the graphics generator according to the user input or itself with the scaled video image to generate an image signal for display.

[0074] The frame rate conversion module is used to convert the input video frame rate, such as converting the 60Hz frame rate to 120Hz frame rate or 240Hz frame rate. The usual format is implemented by interpolation.

[0075] The display formatting module is used to receive the frame rate converted video output signal and change the signal to conform to the display format signal, such as outputting RGB data signal.

[0076] In some embodiments, the graphics processor 253 can be integrated with the video processor or can be separately configured. When integrated, it can perform processing of graphics signals output to the display screen. When separately configured, it can perform different functions respectively, such as a GPU+FRC (Frame Rate Conversion) architecture.

[0077] In some embodiments, the audio processor 280 is used to receive an external audio signal, and perform decompression and decoding, as well as noise reduction, digital-to-analog conversion, and amplification processing according to the standard codec protocol of the input signal to obtain a sound signal that can be played in a speaker.

[0078] In some embodiments, the video processor 270 may include one or more chips. The audio processor may also include one or more chips.

[0079] In some embodiments, the video processor 270 and the audio processor 280 may be separate chips, or may be integrated with the controller into one or more chips.

[0080] The power supply 290, under the control of the controller 250, uses the power input from the external power supply to provide power supply support for the display device 200. The power supply 290 may include a built-in power supply circuit installed inside the display device 200, or may be an external power supply installed on the display device 200 to provide a power interface for an external power supply in the display device 200.

[0081] The user interface 265 is used to receive a user input signal, and then send the received user input signal to the controller 250. The user input signal may be a remote control signal received by an infrared receiver, and may receive various user control signals through a network communication module.

[0082] In some embodiments, the user inputs a user command through the control device 100 or the mobile terminal 300 , the user input interface is based on the user input, and the display device 200 responds to the user input through the controller 250 .

[0083] In some embodiments, the "user interface" is a medium interface for interaction and information exchange between an application or operating system and a user, which realizes the conversion between the internal form of information and the form acceptable to the user. The commonly used form of user interface is the graphical user interface (GUI), which refers to a user interface related to computer operation displayed in a graphical manner. It can be an interface element such as an icon, window, control, etc. displayed on the display screen of an electronic device, where the control can include icons, buttons, menus, tabs, text boxes, dialog boxes, status bars, navigation bars, widgets, and other visual interface elements.

[0084] In some embodiments, Figure 3 As shown in , the application layer includes at least one application that can display a corresponding icon control in the display screen, such as: a live TV application icon control, a video on demand application icon control, a media center application icon control, an application center icon control, a game application icon control, etc.

[0085] In some embodiments, the live TV application can provide live TV through different signal sources. For example, the live TV application can use input from cable TV, wireless broadcast, satellite service, or other types of live TV services to provide TV signals. And, the live TV application can display video of the live TV signal on the display device 200.

[0086] In some embodiments, the video on demand application can provide videos from different storage sources. Unlike the live TV application, the video on demand provides video display from certain storage sources. For example, the video on demand can come from the server side of the cloud storage, from the local hard disk storage containing the stored video programs.

[0087] In some embodiments, the media center application can provide an application for playing various multimedia contents. For example, the media center can be a service provided by a user to access various images or audios through the media center application, which is different from live TV or video on demand.

[0088] In some embodiments, the application center can provide and store various applications. The application can be a game, an application, or some other application related to a computer system or other device but can be run on a smart TV. The application center can obtain these applications from different sources, store them in a local storage, and then run them on the display device 200.

[0089] At present, when the aspect ratio of the effective display area of ​​the video image played by the display device is different from the aspect ratio of the output signal of the display screen of the display device, the display device may achieve aspect conversion by means of black borders, and black borders will appear on the edges of the played video image. This will cause the dynamic contrast determined by the display device to be lower than the ideal dynamic contrast, affecting the playback effect.

[0090] In order to solve the above technical problems, in the embodiment of the present application, when the edge of the image to be displayed contains a concentrated black edge distribution area, the black display area in the video image to be played is eliminated, and the dynamic contrast is determined only according to the brightness information of each pixel in the effective display area of ​​the video image to be played, so that the determined dynamic contrast is not affected by the brightness of the pixels in the above black display area, and thus has higher accuracy. The following is a detailed description using a detailed embodiment.

[0091] In the embodiment of the present application, the controller 250 is configured as follows:

[0092] Before the display screen displays an image, an image data signal input into the display screen is obtained to determine whether there is a black display area in the image to be displayed corresponding to the image data signal; when there is a black display area in the image to be displayed, the target display area occupied by the black display area in the above image to be displayed is detected; and the dynamic contrast of the display screen is determined based on the brightness information of each pixel in the remaining display area except the target display area in the above image to be displayed.

[0093] The black display area can be understood as the extra black part around the original photographic image when the normal original photographic image (or effective display image) is displayed on the display screen, also known as the black border. The black border exists in the video image, which is usually caused by the difference between the aspect ratio of the original image and the aspect ratio of the display screen, and the position of the black border in the video image may be different. For example, it may be located only at the upper and lower edges of the display screen; it may also be located only at the left and right edges of the display screen; it may also be located at the upper, lower, left and right edges of the display screen at the same time.

[0094] In order to better understand the embodiments of the present application, refer to Figure 4 , Figure 4 FIG. 4 is a schematic diagram showing a display of a black display area in an image to be displayed according to some embodiments. Figure 4 In the figure, 401 represents the target image displayed on the display screen 275, and 402 represents the black display area generated when the target image 401 is displayed on the display screen 275.

[0095] The display device provided in the embodiment of the present application obtains an image data signal input into the display screen before the display screen displays an image, determines whether there is a black display area in the image to be displayed corresponding to the image data signal, and when there is a black display area, determines the target display area occupied by the black display area in the image to be displayed, and then determines the dynamic contrast of the display screen based on the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed, so that the determined dynamic contrast is not affected by the brightness of the pixels in the above-mentioned black display area, and has higher accuracy.

[0096] Specifically, when detecting whether there is a black display area in the image to be displayed, it is possible to detect whether there is a black display area only in the first detection area in the image to be displayed; when there is a black display area in the first detection area, it is determined that there is a black display area in the image to be displayed.

[0097] In some embodiments, the display resolution of the display screen, that is, the aspect ratio of the display screen, and the type of the above-mentioned image data signal can be determined first, and then the first detection area in the image to be displayed can be determined according to the display resolution of the display screen and the type of the above-mentioned image data signal; wherein the first detection area includes a first upper edge detection area, a first lower edge detection area, a first left edge detection area and a first right edge detection area.

[0098] For example, the aspect ratio of standard television is generally 4:3 (1.33:1), while the aspect ratio of wide-screen television and HDTV is generally 16:9 (1.78:1). The aspect ratio of movie video data signals is usually 21:9, and the aspect ratio of broadcast program video data signals is generally 4:3.

[0099] Exemplarily, the first upper edge detection area is located at the upper edge of the image to be displayed, and the width of the first upper edge detection area can account for 6% of the width of the image to be displayed; the first lower edge detection area is located at the lower edge of the image to be displayed, and the width of the first lower edge detection area can account for 6% of the width of the image to be displayed; the first left edge detection area is located at the left edge of the image to be displayed, and the width of the first left edge detection area can account for 6% of the length of the image to be displayed; the first right edge detection area is located at the right edge of the image to be displayed, and the width of the first right edge detection area can account for 6% of the length of the image to be displayed.

[0100] In order to better understand the embodiments of the present application, refer to Figure 5a and Figure 5b , Figure 5a and Figure 5b A schematic diagram of displaying the first detection area in the image to be displayed according to some embodiments is exemplarily shown in FIG.

[0101] exist Figure 5a In FIG. 5 , 501 represents the first upper edge detection area, and 502 represents the first lower edge detection area; Figure 5b In FIG. 5 , 503 represents a first left edge detection region, and 504 represents a first right edge detection region.

[0102] In some embodiments, when detecting whether there is a black display area in the above-mentioned first detection area, the average brightness value and brightness histogram of the pixels contained in the first upper edge detection area, the first lower edge detection area, the first left edge detection area and the first right edge detection area are first determined respectively. When the average brightness value of the pixels contained in any detection area is less than a preset brightness threshold, and the brightness values ​​in the corresponding brightness histogram are distributed within a preset range, it is determined that there is a black display area in the detection area.

[0103] Exemplarily, when the average brightness value of pixels contained in the first upper edge detection area is less than a preset brightness threshold, and the brightness values ​​in the corresponding brightness histogram are distributed within a preset value range, it is determined that there is a black display area in the first upper edge detection area.

[0104] The display device provided in the embodiment of the present application, because when the effective display area of ​​the video image played by the display device is different from the aspect ratio specification of the display screen of the display device, the black display area generated in the image to be displayed will be distributed at the edge position of the image to be displayed. Therefore, when detecting whether there is a black display area in the image to be displayed, the present application only performs detection in the first detection area in the image to be displayed, which can not only accurately detect whether there is a black display area in the image to be displayed, but also effectively improve the detection efficiency.

[0105] Based on the contents described in the above embodiments, in some feasible implementation manners of the application, when it is determined that there is a black display area in the image to be displayed, a target display area occupied by the black display area is detected within a second detection area in the image to be displayed.

[0106] In some embodiments, the display resolution of the display screen and the type of the above-mentioned image data signal are first determined, and then the second detection area in the image to be displayed is determined according to the display resolution of the display screen and the type of the above-mentioned image data signal; wherein the second detection area includes a second upper edge detection area, a second lower edge detection area, a second left edge detection area and a second right edge detection area.

[0107] The second detection area includes the first detection area.

[0108] Exemplarily, the first upper edge detection area is located at the upper edge of the image to be displayed, and the width of the first upper edge detection area can account for 12% of the width of the image to be displayed; considering the superposition of subtitles, the first lower edge detection area is located at the lower edge of the image to be displayed, and the width of the first lower edge detection area can account for 16% of the width of the image to be displayed; the first left edge detection area is located at the left edge of the image to be displayed, and the width of the first left edge detection area can account for 13% of the length of the image to be displayed; the first right edge detection area is located at the right edge of the image to be displayed, and the width of the first right edge detection area can account for 13% of the length of the image to be displayed.

[0109] In some embodiments, when detecting the target display area occupied by the black display area, the pixels within the second detection area can be traversed to determine the target pixels within the black display area among the pixels within the second detection area; then, based on the positions of the determined target pixels within the black display area in the image to be displayed, the target display area occupied by the black display area is determined.

[0110] Exemplarily, when there is a black display area in the first upper edge detection area and the first lower edge detection area, each row of pixels in the second upper edge detection area and the second lower edge detection area is traversed. If the ratio of the number of continuously distributed black pixels in the currently traversed row of pixels to the total number of pixels in the currently traversed row of pixels is greater than a preset threshold, it is determined that the currently traversed row of pixels belongs to the target pixels in the black display area.

[0111] When there is a black display area in the first left edge detection area and the first right edge detection area, traverse each column of pixels in the second left edge detection area and the second right edge detection area. If the ratio of the number of continuously distributed black pixels in the currently traversed column of pixels to the total number of pixels in the currently traversed column of pixels is greater than a preset threshold, it is determined that the currently traversed column of pixels belongs to the target pixel in the black display area.

[0112] In order to better understand the embodiments of the present application, the present application takes the first upper edge detection area as an example for explanation:

[0113] By traversing each row of pixels in the first upper edge detection area from top to bottom, if the ratio of the number of continuously distributed black pixels in the currently traversed row of pixels to the total number of pixels in the currently traversed row of pixels is greater than a preset threshold, it is determined that the currently traversed row of pixels belongs to the target pixels in the black display area. When the traversal is completed, the area occupied by several consecutive rows of target pixels in the above first upper edge detection area is determined as the target display area occupied by the black display area.

[0114] The display device provided in the embodiment of the present application can accurately determine the target display area occupied by the black display area in the image to be displayed by traversing the pixels in the second detection area, and the detection efficiency is high.

[0115] Based on the contents described in the above embodiments, a method for determining a dynamic contrast ratio is also provided in the embodiments of the present application. Figure 6 , Figure 6 A flow chart of a method for determining a dynamic contrast ratio is exemplarily shown in FIG. 1 , and the method comprises:

[0116] S601 , obtaining an image data signal inputted into a display screen, and determining whether there is a black display area in an image to be displayed corresponding to the image data signal.

[0117] S602: When there is a black display area in the image to be displayed, determine the target display area occupied by the black display area in the image to be displayed.

[0118] S603: Determine the dynamic contrast ratio of the display screen according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed.

[0119] The method for determining dynamic contrast provided in the embodiment of the present application eliminates the black display area in the video image to be played when the edge of the video image to be played contains a concentrated black edge distribution area, and determines the dynamic contrast only based on the brightness information of each pixel in the effective display area of ​​the video image to be played. This enables the determined dynamic contrast to be unaffected by the brightness of the pixels in the black display area, and therefore has higher accuracy.

[0120] In a feasible implementation manner, the above-mentioned determination of whether there is a black display area in the image to be displayed corresponding to the image data signal includes:

[0121] It is detected whether there is a black display area in the first detection area in the image to be displayed; when the black display area exists in the first detection area, it is determined that there is a black display area in the image to be displayed.

[0122] In a feasible implementation manner, the above-mentioned detecting whether there is a black display area in the first detection area in the image to be displayed includes:

[0123] Determine the average brightness value and brightness histogram of the pixels contained in the first detection area; when the average brightness value of the pixels contained in the first detection area is less than a preset brightness threshold and the brightness values ​​in the brightness histogram are distributed within a preset range, determine that there is a black display area in the first detection area.

[0124] In a feasible implementation manner, the above-mentioned determination of the target display area occupied by the black display area in the image to be displayed includes:

[0125] A target display area occupied by a black display area is detected within a second detection area in the image to be displayed; wherein the second detection area includes the first detection area.

[0126] In a feasible implementation manner, the above-mentioned detecting the target display area occupied by the black display area in the second detection area in the image to be displayed includes:

[0127] Traverse the pixels in the second detection area to determine the target pixels in the second detection area that belong to the black display area; determine the target display area occupied by the black display area according to the positions of the determined target pixels that belong to the black display area in the image to be displayed.

[0128] In a feasible implementation manner, before determining whether there is a black display area in the image to be displayed corresponding to the image data signal, the method includes:

[0129] Determine the display resolution of the display screen and the type of the above-mentioned image data signal; determine the first detection area and the second detection area in the image to be displayed according to the display resolution of the display screen and the type of the above-mentioned image data signal; wherein the first detection area includes a first upper edge detection area, a first lower edge detection area, a first left edge detection area and a first right edge detection area; the second detection area includes a second upper edge detection area, a second lower edge detection area, a second left edge detection area and a second right edge detection area.

[0130] In a feasible implementation manner, the traversing of pixels in the second detection area to determine a target pixel in the black display area among the pixels in the second detection area includes:

[0131] When there is a black display area in the first upper edge detection area and the first lower edge detection area, each row of pixels in the second upper edge detection area and the second lower edge detection area is traversed. If the ratio of the number of continuously distributed black pixels in the current traversed row of pixels to the total number of pixels in the current traversed row of pixels is greater than a preset threshold, it is determined that the current traversed row of pixels belongs to the target pixels in the black display area.

[0132] When there is a black display area in the first left edge detection area and the first right edge detection area, traverse each column of pixels in the second left edge detection area and the second right edge detection area. If the ratio of the number of continuously distributed black pixels in the currently traversed column of pixels to the total number of pixels in the currently traversed column of pixels is greater than a preset threshold, it is determined that the currently traversed column of pixels belongs to the target pixel in the black display area.

[0133] It should be noted that the implementation principles of each step in the above-mentioned method for determining the dynamic contrast are consistent with the implementation principles of each function corresponding to the display device described in the above-mentioned embodiments. For details, please refer to the contents described in each embodiment corresponding to the above-mentioned display device, which will not be repeated here.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0135] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A method for determining a dynamic contrast ratio, characterized in that: The method comprises: Acquire an input image data signal; determine a first detection area in the image to be displayed according to the display resolution of the display screen and the type of the image data signal; detect whether there is a black display area in the first detection area; wherein the first detection area includes a first upper edge detection area, a first lower edge detection area, a first left edge detection area, and a first right edge detection area; When there is a black display area in the first detection area, determining that there is a black display area in the image to be displayed; When there is a black display area in the image to be displayed, a target display area occupied by the black display area is detected within a second detection area in the image to be displayed; the second detection area includes the first detection area; the second detection area includes a second upper edge detection area, a second lower edge detection area, a second left edge detection area, and a second right edge detection area; Determining the dynamic contrast ratio of the display screen according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed; Detecting a target display area occupied by the black display area in a second detection area in the image to be displayed includes: When there is a black display area in the first upper edge detection area and the first lower edge detection area, traverse each row of pixels in the second upper edge detection area and the second lower edge detection area, and if the ratio of the number of continuously distributed black pixels in the currently traversed row of pixels to the total number of pixels in the currently traversed row of pixels is greater than a preset threshold, determine that the currently traversed row of pixels belongs to the target pixels in the black display area; When there is a black display area in the first left edge detection area and the first right edge detection area, traverse each column of pixels in the second left edge detection area and the second right edge detection area, and if the ratio of the number of continuously distributed black pixels in the currently traversed column of pixels to the total number of pixels in the currently traversed column of pixels is greater than the preset threshold, determine that the currently traversed column of pixels belongs to the target pixel in the black display area; According to the determined positions of the target pixels belonging to the black display area in the image to be displayed, the target display area occupied by the black display area is determined.

2. The method according to claim 1, characterized in that Detecting whether there is a black display area in a first detection area in the image to be displayed includes: Determining an average brightness value and a brightness histogram of pixels contained in the first detection area; When the average brightness value of the pixels contained in the first detection area is less than a preset brightness threshold, and the brightness values ​​in the brightness histogram are distributed within a preset range, it is determined that a black display area exists in the first detection area.

3. The method according to claim 1, characterized in that , the method comprises: Determining the display resolution of the display screen and the type of the image data signal; The second detection area in the image to be displayed is determined according to the display resolution of the display screen and the type of the image data signal.

4. A display device, characterized in that: The display device comprises: Display screen; A controller in communication with the display screen, the controller being configured to: Acquire the image data signal inputted from the display screen, and determine the first detection area in the image to be displayed according to the display resolution of the display screen and the type of the image data signal; detect whether there is a black display area in the first detection area; wherein the first detection area includes a first upper edge detection area, a first lower edge detection area, a first left edge detection area, and a first right edge detection area; When there is a black display area in the first detection area, determining that there is a black display area in the image to be displayed; When there is a black display area in the image to be displayed, a target display area occupied by the black display area is detected within a second detection area in the image to be displayed; the second detection area includes the first detection area; the second detection area includes a second upper edge detection area, a second lower edge detection area, a second left edge detection area, and a second right edge detection area; Determining the dynamic contrast ratio of the display screen according to the brightness information of each pixel in the remaining display area except the target display area in the image to be displayed; The controller is specifically configured to: when there is a black display area in the first upper edge detection area and the first lower edge detection area, traverse each row of pixels in the second upper edge detection area and the second lower edge detection area, and if the ratio of the number of continuously distributed black pixels in the currently traversed row of pixels to the total number of pixels in the currently traversed row of pixels is greater than a preset threshold, determine that the currently traversed row of pixels belongs to the target pixels in the black display area; When there is a black display area in the first left edge detection area and the first right edge detection area, traverse each column of pixels in the second left edge detection area and the second right edge detection area, and if the ratio of the number of continuously distributed black pixels in the currently traversed column of pixels to the total number of pixels in the currently traversed column of pixels is greater than the preset threshold, determine that the currently traversed column of pixels belongs to the target pixel in the black display area; According to the determined positions of the target pixels belonging to the black display area in the image to be displayed, the target display area occupied by the black display area is determined.

5. The display device according to claim 4, characterized in that The detecting whether there is a black display area in the first detection area specifically includes: Determining an average brightness value and a brightness histogram of pixels contained in the first detection area; When the average brightness value of the pixels contained in the first detection area is less than a preset brightness threshold, and the brightness values ​​in the brightness histogram are distributed within a preset range, it is determined that a black display area exists in the first detection area.

Images