CN117612499A

CN117612499A - Display device and screen brightness adjusting method

Info

Publication number: CN117612499A
Application number: CN202310432484.6A
Authority: CN
Inventors: 李春超; 刘杨; 王之奎
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2023-04-20
Filing date: 2023-04-20
Publication date: 2024-02-27

Abstract

The embodiment of the application relates to the technical field of display, and discloses display equipment and a screen brightness adjusting method, wherein the display equipment comprises the following steps: a display configured to display an HDR video comprising a plurality of consecutive HDR video frames; a controller configured to: in the case where the display displays an HDR video frame, and the HDR video frame includes subtitles, determining a screen luminance value of the display device and a luminance value of a subtitle region of the HDR video frame; determining a reference brightness value according to the screen brightness value; and under the condition that the brightness value of the caption area is larger than the reference brightness value, adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value. By applying the technical scheme, the brightness of the caption area can be prevented from being too high while the bright part details and the dark part details of the HDR video frame are highlighted, and the watching experience of a user is improved.

Description

Display device and screen brightness adjusting method

Technical Field

The embodiment of the application relates to the technical field of display, in particular to display equipment and a screen brightness adjusting method.

Background

Currently, the highest luminance value of the conventional standard dynamic range (Standard Dynamic Range, SDR) can reach 100 nits. Compared with the traditional standard dynamic range, the brightness range of the high dynamic range (High Dynamic Range, HDR) image can reach 0-1000 nit. Therefore, the High Dynamic Range (HDR) technology can express richer brightness details and dark part details, so that the whole picture is richer, and better image quality is presented.

In the related art, when playing High Dynamic Range (HDR) video, a picture is processed in a manner of improving brightness of the picture and expanding dynamic range, so as to improve image effect. However, since the subtitles in the video are usually white, the brightness of the picture is improved, and the brightness of the subtitles is also obviously improved, so that the subtitles are too high in brightness, and a dazzling feeling is generated, so that the watching experience of a user is influenced.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide a display device and a screen brightness adjustment method, which are used to solve the problem that when a display device plays a High Dynamic Range (HDR) video, a user viewing experience is affected due to a dazzling feeling generated by too high subtitle brightness in the prior art.

According to a first aspect of embodiments of the present application, there is provided a display device, including: a display configured to display an HDR video comprising a plurality of consecutive HDR video frames; a controller coupled to the display and configured to: in the case where the display displays an HDR video frame, and the HDR video frame includes subtitles, determining a screen luminance value of the display device and a luminance value of a subtitle region of the HDR video frame; determining a reference brightness value according to the screen brightness value; and under the condition that the brightness value of the caption area is larger than the reference brightness value, adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value.

In an alternative, the controller is configured to: and determining a reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor.

In an alternative manner, the reference luminance value includes a first luminance value and a second luminance value, the second luminance value being smaller than the first luminance value, the controller configured to: determining a reference brightness value as a first brightness value under the condition that the screen brightness value is in a first brightness range and the ambient light intensity value is greater than or equal to a preset intensity value; and determining the reference brightness value as a second brightness value under the condition that the screen brightness value is in the first brightness range and the ambient light intensity value is smaller than the preset intensity value.

In an alternative manner, the reference luminance value includes a third luminance value and a fourth luminance value, the fourth luminance value being less than the third luminance value, the controller configured to: determining a reference brightness value as a third brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is greater than or equal to the preset intensity value; wherein the minimum value of the second brightness range is larger than or equal to the maximum value of the first brightness range, and the third brightness value is larger than the first brightness value; determining a reference brightness value as a fourth brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is smaller than the preset intensity value; wherein the fourth luminance value is greater than or equal to the second luminance value.

In an alternative mode, the display comprises a display module, wherein the display module comprises a plurality of pixel units distributed in an array; a controller configured to: determining a maximum brightness value among a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or, determining an average value of a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or determining the screen brightness value of the display device according to the brightness value of the target area of the display device, wherein the target area is an area on the display device, and the distance between the target area and the subtitle area of the HDR video frame is smaller than the preset distance.

In an alternative, the controller is configured to: determining a subtitle region of an HDR video frame based on a text recognition algorithm; a luminance value of a subtitle region of the HDR video frame is determined.

In an alternative mode, the display comprises a display module and a backlight module, wherein the backlight module is used for providing light sources with different brightness for the display module; a controller configured to: adjusting the power supply voltage or power supply current of the backlight module according to the reference brightness value so as to adjust the brightness value of the caption area to be a target brightness value; or, the duty ratio of the pulse signal of the backlight module is adjusted according to the reference brightness value, so that the brightness value of the caption area is adjusted to be the target brightness value.

According to a second aspect of an embodiment of the present application, there is provided a method for adjusting screen brightness, which is applied to the display device according to the first aspect of the embodiment of the present invention, and includes: in the case where the HDR video frame is displayed and the HDR video frame includes subtitles, determining a screen luminance value of the display device and a luminance value of a subtitle region of the HDR video frame; determining a reference brightness value according to the screen brightness value; and under the condition that the brightness value of the caption area is larger than the reference brightness value, adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value.

In an alternative way, determining the reference luminance value from the screen luminance value includes: and determining a reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor.

In an alternative manner, the reference brightness value includes a first brightness value and a second brightness value, the second brightness value is smaller than the first brightness value, and determining the reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor includes: determining a reference brightness value as a first brightness value under the condition that the screen brightness value is in a first brightness range and the ambient light intensity value is greater than or equal to a preset intensity value; and determining the reference brightness value as a second brightness value under the condition that the screen brightness value is in the first brightness range and the ambient light intensity value is smaller than the preset intensity value.

In an alternative manner, the reference brightness value includes a third brightness value and a fourth brightness value, the fourth brightness value is smaller than the third brightness value, and determining the reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor includes: determining a reference brightness value as a third brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is greater than or equal to the preset intensity value; wherein the minimum value of the second brightness range is larger than or equal to the maximum value of the first brightness range, and the third brightness value is larger than the first brightness value; determining a reference brightness value as a fourth brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is smaller than the preset intensity value; wherein the fourth luminance value is greater than or equal to the second luminance value.

In an alternative mode, the display comprises a display module, wherein the display module comprises a plurality of pixel units distributed in an array; determining a screen brightness value of a display device, comprising: determining a maximum brightness value among a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or, determining an average value of a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or determining the screen brightness value of the display device according to the brightness value of the target area of the display device, wherein the target area is an area on the display device, and the distance between the target area and the subtitle area of the HDR video frame is smaller than the preset distance.

In an alternative way, determining the luminance value of the subtitle region of the HDR video frame includes: determining a subtitle region of an HDR video frame based on a text recognition algorithm; a luminance value of a subtitle region of the HDR video frame is determined.

In an alternative mode, the display comprises a display module and a backlight module, wherein the backlight module is used for providing light sources with different brightness for the display module; adjusting the luminance value of the caption area according to the reference luminance value, including: adjusting the power supply voltage or power supply current of the backlight module according to the reference brightness value so as to adjust the brightness value of the caption area to be a target brightness value; or, the duty ratio of the pulse signal of the backlight module is adjusted according to the reference brightness value, so that the brightness value of the caption area is adjusted to be the target brightness value.

According to a third aspect of embodiments of the present application, there is provided a screen brightness adjustment device, including: a first determining module for determining a screen luminance value of a display device and a luminance value of a subtitle region of an HDR video frame in a case where the HDR video frame is displayed and the HDR video frame includes a subtitle; the second determining module is used for determining a reference brightness value according to the screen brightness value; and the brightness adjusting module is used for adjusting the brightness value of the caption area according to the reference brightness value under the condition that the brightness value of the caption area is larger than the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, and the target brightness value is smaller than or equal to the reference brightness value.

According to a fourth aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored therein at least one executable instruction that, when executed on a display device, causes the display device to perform the operations of the above-described screen brightness adjustment method.

In this embodiment, when the display displays the HDR video frame, the controller is configured to control the backlight module to work according to the luminance data of the HDR video frame, so as to improve the luminance value of the bright pixel point of the HDR video frame, and further present better image quality. And under the condition that the display displays the HDR video frame, if the HDR video frame comprises subtitles and the luminance value of the subtitle region of the HDR video frame is larger than the reference luminance value, the controller can work by controlling a part of backlight units corresponding to the subtitle region in the backlight module so as to reduce the luminance value corresponding to the subtitle region of the HDR video frame. In this way, when the display device displays the HDR video frame, the luminance value of the subtitle region of the HDR video frame will not be greatly increased when the overall luminance value of the HDR video frame is increased, so that the bright portion detail and the dark portion detail of the HDR video frame are highlighted, and meanwhile discomfort of eyes of a user caused by too high luminance of the subtitle region can be avoided, thereby improving viewing experience of the user.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present application can be more clearly understood, and the following detailed description of the present application will be presented in order to make the foregoing and other objects, features and advantages of the embodiments of the present application more understandable.

Drawings

The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

fig. 1 shows an interaction schematic diagram of a display device and a control device provided in an embodiment of the present application;

fig. 2 shows a block diagram of a configuration of a control device in an embodiment of the present application;

fig. 3 shows a hardware configuration block diagram of a display device provided in an embodiment of the present application;

fig. 4 shows a software configuration schematic diagram of a display device according to an embodiment of the present application;

fig. 5 shows a hardware block diagram of another display device according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a display area provided by an embodiment of the present application;

fig. 7 shows a flowchart of a screen brightness adjustment method according to an embodiment of the present application;

FIG. 8 is a flowchart of another method for adjusting screen brightness according to an embodiment of the present application;

fig. 9 shows a schematic structural diagram of a screen brightness adjusting device according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein.

The dynamic range may be used to describe the luminance variation range of an image, which may represent the difference between the maximum luminance and the minimum luminance in the image, the larger the dynamic range, the larger the luminance variation range of the image.

In general, dynamic ranges can be divided into low dynamic range (Low Dynamic Range, LDR), standard dynamic range (Standard Dynamic Range, SDR) and high dynamic range (High Dynamic Range, HDR). Wherein, for LDR and SDR, the highest brightness of the image can only reach 100 nits. When the LDR display technology or the SDR display technology is adopted for image display, the brightness values of the partial pixel points with strong light in the image are all 100 nits, which are far lower than the actual brightness values in the scene, so that the bright part details in the image can not be represented, and the display effect is poor. However, compared to LDR and SDR, HDR has a larger exposure range, and the luminance variation range of HDR can reach 0-1000 nit. When the HDR display technology is adopted for image display, as the brightness variation range of different pixel points in one frame of image is larger, the brightness corresponding to the pixel points with stronger light and the brightness corresponding to the pixel points with darker light in the image are matched with the actual brightness in the scene, so that the image can express richer brightness details and dark part details, the whole picture is richer, and better image quality can be presented. Therefore, the application of HDR display technology is becoming more and more widespread.

When the display device plays a High Dynamic Range (HDR) video, the display device processes a video frame of the HDR video, so that the brightness value of a pixel point of a bright part of the video frame of the HDR video is higher, and the brightness value of a pixel point of a dark part is lower, so that richer brightness details and dark part details can be expressed, and better image quality is presented. However, since the subtitles in the video are usually white, the brightness value of the subtitle area is obviously increased while the brightness value of the pixel point of the bright part of the image is increased, so that the subtitle brightness is too high, a dazzling feeling is generated, and the viewing experience of the user is affected.

For example, when a user views HDR video through application software, the luminance value of the video frame may be significantly increased, the screen luminance of the display device may be significantly variable, and accordingly, the luminance of the subtitle region may be significantly increased, resulting in a dazzling feeling, which may cause discomfort to eyes of the user.

Also for example, when a user views a video through application software, if the video currently played is an SDR video, the luminance value of the video frame may reach 100 nits at the highest. When the user switches to the next video, if the next video is an HDR video, the luminance value of the pixel point corresponding to the bright portion of the video frame will be significantly increased (for example, from 100 nit to 1000 nit), and then the luminance of the subtitle region will also be significantly increased, which will cause a significant jump in the screen luminance of the display device, resulting in serious discomfort of the eyes of the user, and affecting the viewing experience of the user.

In view of the above technical problems, embodiments of the present application provide a display device and a screen brightness adjustment method, where the screen brightness adjustment method is applied to the display device, and when the display device displays an HDR video frame and the HDR video frame includes a subtitle, the method determines a screen brightness value of the display device and a brightness value of a subtitle region of the HDR video frame, and determines a reference brightness value according to the screen brightness value of the display device, so that when the brightness value of the subtitle region is greater than the reference brightness value, the brightness value of the subtitle region is adjusted according to the reference brightness value, so that the brightness value of the subtitle region is adjusted to be a target brightness value, where the target brightness value is less than or equal to the reference brightness value. In this way, when the display device displays the HDR video frame, the luminance value of the subtitle region of the HDR video frame will not be greatly increased when the overall luminance value of the HDR video frame is increased, so that the bright portion detail and the dark portion detail of the HDR video frame are highlighted, and meanwhile discomfort of eyes of a user caused by too high luminance of the subtitle region can be avoided, thereby improving viewing experience of the user.

A display apparatus for implementing the screen brightness adjustment method will be described first.

Fig. 1 shows an interaction schematic diagram of a display device and a control device provided in an embodiment of the present application. As shown in fig. 1, a user may operate the display device 200 through the smart device 300 or the control apparatus 100.

In some embodiments, the control apparatus 100 may be a remote controller, and the remote controller and the display device 200 may communicate through an infrared protocol, a bluetooth protocol, or the remote controller may control the display device 200 in a wireless or other wired manner. The user may input user instructions through keys on a remote controller, voice input, a control panel, etc., to control the display device 200. For example, the user can control the display device 200 to switch the displayed page by means of navigation keys (up key, down key, left key, right key) on the remote controller.

In some embodiments, a user may also control the display device 200 using a smart device 300 (e.g., a mobile terminal, tablet, computer, notebook, etc. other smart devices). For example, a user may control the display device 200 through an application installed on the smart device 300 that, by configuration, may provide the user with various controls in an intuitive user interface on a screen associated with the smart device 300. Also for example, the display device 200 is controlled using an application running on the smart device 300.

In some embodiments, the smart device 300 may implement connection communication with a software application installed on the display device 200 through a network communication protocol for the purpose of one-to-one control operation and data communication. For example, it may be implemented to establish a control instruction protocol with the smart device 300 and the display device 200, synchronize a remote control keyboard to the smart device 300, control a function of the display device 200 by controlling a user interface on the smart device 300, or may also transmit content displayed on the smart device 300 to the display device 200, so as to implement a function of synchronous display.

In some embodiments, the display device 200 may also perform control in a manner other than the control apparatus 100 and the smart device 300, for example, the voice command control of the user may be directly received through a module configured inside the display device 200 device for acquiring voice commands, or the voice command control of the user may be received through a voice control device configured outside the display device 200 device.

As shown in fig. 1, the display device 200 and the server 400 may communicate data in a variety of communication manners, which may allow the display device 200 to be communicatively connected via a local area network (Local Area Network, LAN), a wireless local area network (Wireless Local Area Network, WLAN), and other networks. The server 400 may provide various contents and interactions to the display device 200. For example, the display device 200 receives software program updates by sending and receiving messages, and electronic program guide (Electrical Program Guide, EPG) interactions, or accesses a remotely stored digital media library. The server 400 may be one cluster or multiple clusters, and may include one or more types of servers.

The display device 200 may be a liquid crystal display, an Organic Light-Emitting Diode (OLED) display, a projection display device, a smart terminal, such as a mobile phone, a tablet computer, etc. The specific display device type, size, resolution, etc. are not limited.

Fig. 2 shows a block diagram of a configuration of the control device 100 in the exemplary embodiment of the present application, and as shown in fig. 2, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface 140, a memory, and a power supply. The control apparatus 100 may receive an operation instruction input by a user and convert the operation instruction into an instruction recognizable and responsive to the display device 200, and may interact with the display device 200.

Taking a display device as an example of a television, fig. 3 shows a hardware configuration block diagram of a display device 200 according to an embodiment of the present application. As shown in fig. 3, the display device 200 includes: a tuner demodulator 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a receiver 280 and at least one of a memory, a power supply, a user interface.

The modem 210 may receive broadcast television signals through a wired or wireless reception manner and demodulate an audio/video signal, such as an EPG data signal, from a plurality of wireless or wired broadcast television signals. The detector 230 may be used to collect signals of the external environment or interaction with the outside.

In some embodiments, the frequency point demodulated by the modem 210 is controlled by the controller 250, and the controller 250 may issue a control signal according to the user selection, so that the modem responds to the television signal frequency selected by the user and modulates and demodulates the television signal carried by the frequency.

The broadcast television signal may be classified into a terrestrial broadcast signal, a cable broadcast signal, a satellite broadcast signal, an internet broadcast signal, or the like according to different broadcasting systems of the television signal. Or may be differentiated into digital modulation signals, analog modulation signals, etc., depending on the type of modulation. And further, the signals are classified into digital signals, analog signals and the like according to different signal types.

In some embodiments, the controller 250 and the modem 210 may be located in separate devices, i.e., the modem 210 may also be located in an external device to the main device in which the controller 250 is located, such as an external set-top box or the like.

In some embodiments, communicator 220 may be a component for communicating with external devices or external servers 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, or other network communication protocol chip or a near field communication protocol chip, and an infrared receiver.

In some embodiments, the detector 230 may be used to collect signals of the external environment or interaction with the outside, and may include light sensors, temperature sensors, and the like.

The light sensor can be used for collecting a sensor of the intensity of ambient light, and adaptively adjusting display parameters according to the intensity of the ambient light. Illustratively, when the display device 200 displays an HDR video frame, in the case where the luminance value of the subtitle region of the HDR video frame is greater than the reference luminance value, the luminance value of the subtitle region may be adjusted according to the intensity value of the ambient light intensity. For example, when the intensity value of the ambient light intensity is high (the ambient light is bright, such as in the daytime), the luminance value of the caption area may be adjusted to be lower and to be the first luminance value; when the intensity value of the ambient light intensity is low (the ambient light is dark, such as at night), the luminance value of the caption area can be adjusted to be lower and adjusted to a second luminance value, and the second luminance value is smaller than the first luminance value. The temperature sensor may be used to sense an ambient temperature so that the display device 200 may adaptively adjust a display color temperature of an image, such as when the ambient temperature is high, a color temperature colder tone of the image displayed by the display device 200 may be adjusted, or when the ambient temperature is low, a color temperature warmer tone of the image displayed by the display device 200 may be adjusted.

In some embodiments, the detector 230 may further include an image collector, such as a camera, a video camera, etc., which may be used to collect external environmental scenes, collect attributes of a user or interact with a user, adaptively change display parameters, and recognize a user gesture to realize an interaction function with the user.

In some embodiments, the detector 230 may also include a sound collector or the like, such as a microphone, that may be used to receive the user's sound. For example, a voice signal including a control instruction for a user to control the display apparatus 200, or an acquisition environment sound for recognizing an environment scene type, so that the display apparatus 200 can adapt to an environment noise.

In some embodiments, external device interface 240 may include, but is not limited to, the following: any one or more of a high-definition multimedia interface (High Definition Multimedia Interface, HDMI) interface, an analog or data high-definition component input interface, a composite video input interface, a universal serial bus (Universal Serial Bus, USB) input interface, an RGB port, or the like, or an input/output interface in which the above interfaces form a composite is also possible.

As shown in fig. 3, the controller 250 may include a central processing unit (Central Processing Unit, CPU), a video processor, an audio processor, a graphic processor (Graphics Processing Unit, GPU), a random access Memory (Random Access Memory, RAM), a Read-Only Memory (ROM), and at least one of first to nth interfaces for input/output. Wherein the communication bus connects the various components.

In some embodiments, the controller 250 may control the operation of the display device and respond to the user's operations through various software control programs stored on an external memory. For example, a user may input a user command through a graphical user interface (Graphic User Interface, GUI) displayed on the display 260, the user input interface receiving the user input command through the graphical user interface, or the user may input the user command by inputting a specific sound or gesture, the user input interface recognizing the sound or gesture through the sensor.

A "user interface" is a media interface for interaction and exchange of information between an application or operating system and a user that enables conversion between an internal form of information and a user-acceptable form. A commonly used presentation form of a user interface is a graphical user interface, which refers to a user interface related to computer operations that is displayed in a graphical manner. The control can comprise at least one of an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget (short for Widget) and other visual interface elements.

In some embodiments, RAM may be used to store temporary data for the operating system or other on-the-fly programs; ROM may be used to store instructions for various system starts, for example, may be used to store instructions for a basic input output system, referred to as a basic input output system (Basic Input Output System, BIOS) start. ROM can be used to complete the power-on self-test of the system, the initialization of each functional module in the system, the driving program of the basic input/output of the system and the booting of the operating system.

In some embodiments, upon receipt of the power-on signal, the display device 200 power begins to boot and the central processor runs the system boot instructions in ROM, copying temporary data of the operating system stored in memory into RAM for booting or running the operating system. When the starting of the operating system is completed, the CPU copies the temporary data of various application programs in the memory into the RAM, and then the temporary data are convenient for starting or running the various application programs.

In some embodiments, the central processor may be configured to execute operating system and application instructions stored in memory, and to execute various applications, data, and content in accordance with various interactive instructions received from external inputs, to ultimately display and play various audio-visual content.

In some example embodiments, the central processor may include a plurality of processors. The plurality of processors may include one main processor and one or more sub-processors. A main processor for performing some operations of the display apparatus 200 in the pre-power-up mode and/or displaying a picture in the normal mode. One or more sub-processors for one operation in a standby mode or the like.

In some embodiments, the video processor may be configured to receive an external video signal, perform video processing in accordance with standard codec protocols for input signals, decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, transparency settings, image composition, etc., and may result in a signal that is displayed or played on the directly displayable device 200.

In some embodiments, the video processor may include a demultiplexing module, a video decoding module, an image compositing module, a frame rate conversion module, a display formatting module, and the like.

The demultiplexing module is used for demultiplexing the input audio/video data stream, such as input moving picture expert group standard 2 (Moving Picture Experts Group-2, MPEG-2), and demultiplexes the input audio/video data stream into video signals, audio signals and the like; the video decoding module is used for processing the demultiplexed video signal, including decoding and scaling, transparency setting, etc.

And an image synthesis module, such as an image synthesizer, for performing superposition mixing processing on the graphic generator and the video image after the scaling processing according to the GUI signal input by the user or generated by the graphic generator, so as to generate an image signal for display. The frame rate conversion module is configured to convert the input video frame rate, for example, converting the 60Hz frame rate into the 120Hz frame rate or the 240Hz frame rate, and the common format is implemented in an inserting frame manner. The display format module is used for converting the received frame rate into a video output signal, and changing the video output signal to a signal conforming to the display format, such as outputting an RGB data signal.

In some embodiments, the audio processor may be configured to receive an external audio signal, decompress and decode the audio signal according to a standard codec protocol of the input signal, and perform noise reduction, digital-to-analog conversion, and amplification processes to obtain a sound signal that may be played in a speaker.

In some embodiments, the video processor may comprise one or more chips. The audio processor may also comprise one or more chips. Meanwhile, the video processor and the audio processor may be a single chip, or may be integrated with the controller in one or more chips.

In some embodiments, the interface for input/output may be used for audio output, that is, receiving the sound signal output by the audio processor under the control of the controller 250 and outputting the sound signal to an external device such as a speaker, and may output the sound signal to an external sound output terminal of the generating device of the external device, except for the speaker carried by the display device 200 itself, for example: external sound interface or earphone interface, etc. The audio output may also include a near field communication module in the communication interface, such as: and the Bluetooth module is used for outputting sound of a loudspeaker connected with the Bluetooth module.

In some embodiments, the graphics processor may be used to generate various graphical objects, such as: icons, operation menus, user input instruction display graphics, and the like. The graphic processor may include an operator to display various objects according to display attributes by receiving user input of various interactive instructions to perform operations. And a renderer for rendering the various objects obtained by the arithmetic unit, wherein the rendered objects are used for being displayed on a display.

In some embodiments, the graphics processor and the video processor may be integrated or may be separately configured, where the integrated configuration may perform processing of graphics signals output to the display, and the separate configuration may perform different functions, such as a graphics processor (Graphics Processing Unit, GPU) +frame frequency conversion technology (Frame Rate Conversion, FRC) architecture, respectively.

The display 260 may be at least one of a liquid crystal display, an OLED display, a touch display, and a projection display, and may also be a projection device and a projection screen.

In some embodiments, the display 260 may be used to display a display interface of an application. The display interface is any page in the application program.

In some embodiments, the display 260 may be used to receive audio and video signals output by the audio processor and video processor, display video content and images, play audio of the video content, and display components of a menu manipulation interface.

In some embodiments, the display 260 may be used to present a user-operated UI interface generated in the display device 200 and used to control the display device 200.

Fig. 4 shows a software configuration schematic diagram of the display device 200 in the exemplary embodiment of the present application, as shown in fig. 4, the system is divided into four layers, namely, an application layer (application layer), an application framework layer (framework layer), an Android run layer, a system library layer (system runtime layer), and a kernel layer from top to bottom.

In some embodiments, at least one application program is running in the application program layer, and these application programs may be a Window (Window) program of an operating system, a system setting program, a clock program, or the like; or may be an application developed by a third party developer. In particular implementations, the application packages in the application layer are not limited to the above examples.

The framework layer provides an application programming interface (application programming interface, API) and programming framework for the application. The application framework layer includes a number of predefined functions. The application framework layer corresponds to a processing center that decides to let the applications in the application layer act. Through the API interface, the application program can access the resources in the system and acquire the services of the system in the execution.

As shown in fig. 4, the application framework layer in the embodiment of the present application includes a manager (manager), a Content Provider (Content Provider), and the like, where the manager includes at least one of the following modules: an Activity Manager (Activity Manager) is used to interact with all activities that are running in the system; a Location Manager (Location Manager) is used to provide system services or applications with access to system Location services; a Package Manager (Package Manager) for retrieving various information about an application Package currently installed on the device; a notification manager (Notification Manager) for controlling the display and clearing of notification messages; a Window Manager (Window Manager) is used to manage bracketing icons, windows, toolbars, wallpaper, and desktop components on the user interface.

In some embodiments, the activity manager is used to manage the lifecycle of the individual applications as well as the usual navigation rollback functions, such as controlling the exit, opening, fallback, etc. of the applications. The window manager is used for managing all window programs, such as obtaining the size of the display screen, judging whether a status bar exists or not, locking the screen, intercepting the screen, controlling the change of the display window (for example, reducing the display window to display, dithering display, distorting display, etc.), etc.

In some embodiments, the system runtime layer provides support for the upper layer, the framework layer, and when the framework layer is in use, the android operating system runs the C/C++ libraries contained in the system runtime layer to implement the functions to be implemented by the framework layer.

In some embodiments, the kernel layer is a layer between hardware and software. The kernel layer contains at least one of the following drivers: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (e.g., fingerprint sensor, temperature sensor, pressure sensor, etc.), MIC drive, power drive, etc.

In some embodiments, in order to implement the function of playing the HDR video, and in order to implement a scheme of adjusting, when the luminance value of the HDR video frame is greater than the reference luminance value, the luminance value of the subtitle region of the HDR video frame according to the reference luminance value, so as to reduce the luminance value of the subtitle region. As shown in fig. 5, the display 260 of the display apparatus 200 may include a display module 261 and a backlight module 262. The display module 261 is used for displaying the HDR video frame. The backlight module 262 is used for providing light sources with different brightness for the display module 261. The controller 250 is coupled to the display, and the controller 250 is configured to control the backlight module 262 to operate according to the luminance data of the HDR video frame when the display 260 displays the HDR video frame, so as to increase the luminance value of the bright pixel of the HDR video frame, and further to present better image quality. And, in case the display 260 displays the HDR video frame, if the HDR video frame includes a subtitle and the luminance value of the subtitle region of the HDR video frame is greater than the reference luminance value, the controller 250 may operate by controlling a portion of the backlight units corresponding to the subtitle region in the backlight module 262 to reduce the luminance value corresponding to the subtitle region of the HDR video frame. In this way, when the display device displays the HDR video frame, the luminance value of the subtitle region of the HDR video frame will not be greatly increased when the overall luminance value of the HDR video frame is increased, so that the bright portion detail and the dark portion detail of the HDR video frame are highlighted, and meanwhile discomfort of eyes of a user caused by too high luminance of the subtitle region can be avoided, thereby improving viewing experience of the user.

In this embodiment, in order to avoid that the brightness value of the adjusted subtitle region is too dark to affect the display effect of the HDR video frame, whether the brightness value of the subtitle region of the HDR video frame is too bright or not may be measured according to the overall brightness value of the HDR video frame, and in the case that the brightness value of the subtitle region of the HDR video frame is too bright, the brightness value of the subtitle region of the HDR video frame may be adjusted according to the overall brightness value of the HDR video frame. Based on this, in some embodiments, the controller 250 is specifically configured to: in the case where the display 260 displays an HDR video frame, and the HDR video frame includes subtitles, determining a screen luminance value of the display device (i.e., an overall luminance value of the HDR video frame) and a luminance value of a subtitle region of the HDR video frame; determining a reference luminance value from the screen luminance value (i.e., the overall luminance value of the HDR video frame); and under the condition that the brightness value of the caption area is larger than the reference brightness value, adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value.

Wherein the screen luminance value of the display device may represent the overall luminance value of the HDR video frame. In some examples, the display module of the display includes a plurality of pixel units distributed in an array, and when the display displays the HDR video frame, the plurality of pixel units of the display module respectively correspond to the plurality of pixel points of the HDR video frame one by one. Based on this, the screen luminance value of the display device can be determined from luminance values corresponding to a plurality of pixel points of the HDR video frame (i.e., luminance values corresponding to a plurality of pixel units).

Illustratively, an average value of luminance values corresponding to a plurality of pixel points of the HDR video frame (luminance values corresponding to a plurality of pixel units of the HDR video frame) is determined as a screen luminance value of the display device.

For example, in a case where the luminance value difference of different pixels of the HDR video frame is large, in order to more accurately detect whether the subtitle region of the HDR video frame is too bright, the maximum luminance value among luminance values corresponding to a plurality of pixels of the HDR video frame (luminance values corresponding to a plurality of pixel units of the HDR video frame) may be determined as the screen luminance value of the display device. In this way, compared with the scheme of determining the average value of the luminance values corresponding to the plurality of pixels of the HDR video frame as the overall luminance value of the HDR video frame, when the luminance value difference of the different pixels of the HDR video frame is large, based on the maximum luminance value among the luminance values corresponding to the plurality of pixels of the HDR video frame, whether the subtitle region of the HDR video frame is too bright or not can be accurately determined, and the luminance value of the subtitle region of the HDR video frame is adjusted according to the maximum luminance value among the luminance values corresponding to the plurality of pixels of the HDR video frame, so that the luminance value of the subtitle region of the HDR video frame is prevented from being too large, the problem of dazzling caused by too large luminance of the subtitle region is solved, and further the viewing experience of the user is improved.

Illustratively, typically, the luminance value of the neighboring region of the subtitle region of the HDR video frame is similar to the subtitle region of the HDR video frame, and thus, in order to more accurately detect whether the subtitle region of the HDR video frame is too bright, the screen luminance value of the display device may be determined from the luminance value of the target region of the display device. The target area is an area, on the display device, of which the distance between the target area and the subtitle area of the HDR video frame is smaller than a preset distance. That is, the luminance value of the adjacent area of the caption area of the HDR video frame is determined, so that whether the caption area of the HDR video frame is too bright or not can be more accurately determined, and then the luminance value of the caption area of the HDR video frame is adjusted according to the luminance value of the adjacent area of the caption area of the HDR video frame, so that the problem of dazzling caused by the overlarge luminance of the caption area can be avoided, and the viewing experience of a user is further improved.

The screen brightness value is illustratively determined according to the brightness value of the target area, and the maximum brightness value in the brightness values corresponding to the plurality of pixel points in the target area can be determined as the screen brightness value. The screen brightness value may be determined according to the brightness value of the target area, or may be an average value of brightness values corresponding to a plurality of pixels in the target area.

For example, as shown in fig. 6, the display module 261 includes m rows×n columns of pixel units distributed in an array, that is, when the display displays the HDR video frame, the m rows×n columns of pixel units correspond to the m rows×n columns of pixel points of the HDR video frame. Typically, the caption area is located at the bottom of the video frame, i.e., caption area 601 is the area corresponding to the (m-2) th line to the m-th line. Accordingly, the target area 602 is an area above the subtitle area 601, and the distance d between the target area 602 and the subtitle area 601 is smaller than a preset distance (e.g., two rows of pixels). More specifically, the distance d between the target area 602 and the subtitle area 601 is 0, i.e., the target area 602 is a neighboring area of the subtitle area. In this regard, the maximum luminance value among the luminance values corresponding to the plurality of pixels in the target area 602 may be determined as the screen luminance value, or the average value of the luminance values corresponding to the plurality of pixels in the target area 602 may be determined as the screen luminance value.

In addition, the backlight unit 262 of the display 260 may include a plurality of backlight units. Illustratively, the backlight module 262 may include a plurality of backlight units in one-to-one correspondence with a plurality of pixel units of the display module 261. The backlight module 262 may include N backlight units and M backlight units correspond to a plurality of pixel units, wherein the backlight module 262 includes fewer than the display module 261 and M is less than N. Based on this, in determining the screen brightness value of the display device, the screen brightness value of the display device may be determined according to the backlight intensities of the plurality of backlight units of the backlight unit 262. The backlight intensity of any one of the backlight units may be determined according to the voltage value of the power supply voltage of the backlight unit, may be determined according to the current value of the power supply current of the backlight unit, or may be determined according to the duty ratio of the pulse signal input to the backlight unit.

In some examples, since the luminance difference of the subtitle region of the HDR video frame is small, determining the luminance value of the subtitle region of the HDR video frame may be: the average value of the luminance values corresponding to the plurality of pixel units in the caption area of the HDR video frame is used as the luminance value of the caption area of the HDR video frame, so that the accuracy of determining the luminance value of the caption area of the HDR video frame can be improved, and then the luminance value of the caption area of the HDR video frame can be adjusted to a lower value in combination with the subsequent steps, so that the problem of dazzling is avoided.

It can be appreciated that in determining the luminance value of the caption area of the HDR video frame, the luminance values of the caption areas of the HDR video frame may be determined by the backlight intensities of the plurality of backlight units corresponding to the caption areas of the HDR video frame. The backlight intensity of any one of the backlight units may be determined according to the voltage value of the power supply voltage of the backlight unit, may be determined according to the current value of the power supply current of the backlight unit, or may be determined according to the duty ratio of the pulse signal input to the backlight unit.

The reference luminance value may be used to measure whether the subtitle region of the HDR video frame is too bright, i.e. whether the luminance value of the subtitle region of the HDR video frame is too large. Also, since the subtitle region of the HDR video frame is brighter at the time when the user is more sensitive to the luminance of the subtitle region of the HDR video frame, the reference luminance value is typically smaller than the screen luminance value of the display device (i.e., the overall luminance value of the HDR video frame).

In particular, the reference luminance value may be determined from the screen luminance value of the display device (i.e., the overall luminance value of the HDR video frame). For example, when the screen luminance value of the display device (i.e., the overall luminance value of the HDR video frame) is large, a large reference luminance value may be set; accordingly, when the screen luminance value of the display device (i.e., the overall luminance value of the HDR video frame) is small, a small reference luminance value may be set.

For example, when the screen luminance value of the display device is less than 1000 nits (i.e., the overall luminance value of the HDR video frame is small), the reference luminance value may be 100 nits, and if the luminance value of the subtitle region of the HDR video frame exceeds the reference luminance value (e.g., 100 nits), the luminance value of the subtitle region of the HDR video frame is adjusted to the target luminance value. At this time, the target luminance value may be 100 nit (i.e., the target luminance value is equal to the reference luminance value), and the target luminance value may be 80 nit (i.e., the target luminance value is smaller than the reference luminance value).

For example, when the screen luminance value of the display device is equal to or greater than 1000 nits and the screen luminance value of the display device is less than 2000 nits (i.e., the overall luminance value of the HDR video frame is greater), the reference luminance value may be 300 nits, and if the luminance value of the subtitle region of the HDR video frame exceeds the reference luminance value (e.g., 300 nits), the luminance value of the subtitle region of the HDR video frame is adjusted to the target luminance value. At this time, the target luminance value may be 300 nit (i.e., the target luminance value is equal to the reference luminance value), and the target luminance value may also be 295 nit (i.e., the target luminance value is smaller than the reference luminance value).

For example, when the screen luminance value of the display device is equal to or greater than 2000 nit (i.e., the overall luminance value of the HDR video frame is greater), the reference luminance value may be 500 nit, and if the luminance value of the subtitle region of the HDR video frame exceeds the reference luminance value (e.g., 500 nit), the luminance value of the subtitle region of the HDR video frame is adjusted to the target luminance value. At this time, the target luminance value may be 500 nit (i.e., the target luminance value is equal to the reference luminance value), and the target luminance value may also be 470 nit (i.e., the target luminance value is less than the reference luminance value).

In this embodiment, when the display displays the HDR video frame, whether the luminance value of the subtitle region of the HDR video frame is too bright or not may be measured according to the overall luminance value of the HDR video frame, and when the luminance value of the subtitle region of the HDR video frame is too bright, the luminance value of the subtitle region of the HDR video frame is adjusted according to the overall luminance value of the HDR video frame, so that the adjusted luminance value of the subtitle region is prevented from being too dark, and the display effect of the HDR video frame is ensured.

In some embodiments, when the display is displaying an HDR video frame, the ambient light intensity of the display device may also affect the look and feel of the user. When the ambient light intensity value of the display device is large (e.g., the user views a video during daytime), since the external environment is bright, even if the luminance value of the subtitle region of the HDR video frame is larger than the reference luminance value (i.e., the subtitle region of the HDR video frame is bright), discomfort is not caused to the eyes of the user. When the ambient light intensity value of the display device is small (e.g., the user views the video at night), the brightness value of the subtitle region of the HDR video frame is smaller than the reference brightness value, which still causes a dazzling feeling and discomfort to the eyes of the user. Based on this, the controller is specifically configured to: and determining a reference brightness value according to the screen brightness value (the overall brightness value of the HDR video frame) and the ambient brightness value of the display device, and adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value.

In some examples, the screen luminance values of the display device (the overall luminance values of the HDR video frame) are in different luminance ranges, with the reference luminance values determined from the screen luminance values of the display device being different.

In some examples, the reference luminance value includes a first luminance value and a second luminance value when the screen luminance value of the display device is in a first luminance range, wherein the reference luminance value is the first luminance value when the ambient light intensity value is greater than or equal to a preset intensity value (i.e., ambient light is brighter) and the reference luminance value is the second luminance value when the ambient light intensity value is less than the preset intensity value (i.e., ambient light is darker).

Illustratively, the controller is configured to: acquiring an ambient light intensity value acquired by a light sensor when a screen brightness value of the display device is in a first brightness range, and determining a reference brightness value as the first brightness value when the ambient light intensity value is greater than or equal to a preset intensity (i.e., the ambient light is brighter); judging whether the brightness value of the caption area of the HDR video frame is larger than a first brightness value; when the brightness value of the caption area of the HDR video frame is larger than the first brightness value, adjusting the brightness value of the caption area of the HDR video frame to a target brightness value, wherein the target brightness value is smaller than or equal to the first brightness value; when the luminance value of the subtitle region of the HDR video frame is less than or equal to the first luminance value, the luminance value of the subtitle region of the HDR video frame is not adjusted by the target luminance value. When the ambient light intensity value is less than the preset intensity (i.e., the ambient light is darker), determining the reference luminance value as a second luminance value; judging whether the brightness value of the caption area of the HDR video frame is larger than a second brightness value; when the brightness value of the caption area of the HDR video frame is larger than the second brightness value, adjusting the brightness value of the caption area of the HDR video frame to a target brightness value, wherein the target brightness value is smaller than or equal to the second brightness value; when the luminance value of the subtitle region of the HDR video frame is less than or equal to the second luminance value, the luminance value of the subtitle region of the HDR video frame is not adjusted by the target luminance value.

In some examples, the reference luminance value includes a third luminance value and a fourth luminance value when the screen luminance value of the display device is in the second luminance range, the reference luminance value is the third luminance value when the ambient light intensity value is greater than or equal to a preset intensity value (i.e., the ambient light is brighter), and the reference luminance value is the fourth luminance value when the ambient light intensity value is less than the preset intensity value (i.e., the ambient light is darker). Wherein the minimum value (lower limit value) of the second luminance range is greater than or equal to the maximum value (upper limit value) of the first luminance range, and the third luminance value is greater than the first luminance value, and the fourth luminance value is greater than or equal to the second luminance value.

For example, when the screen luminance value of the display device is less than 1000 nit (i.e., the screen luminance value of the display device is in the first luminance range), the reference luminance value includes a first luminance value of 100 nit and a second luminance value of 300 nit. When the screen luminance value of the display device is greater than or equal to 1000 nit and less than 2000 nit (i.e., the screen luminance value of the display device is in the second luminance range), the reference luminance value includes a third luminance value of 200 nit and a fourth luminance value of 500 nit.

Illustratively, the controller is configured to: acquiring an ambient light intensity value acquired by a light sensor when a screen brightness value of the display device is in a second brightness range, and determining a reference brightness value as a third brightness value when the ambient light intensity value is greater than or equal to a preset intensity (i.e., ambient light is brighter); judging whether the brightness value of the caption area of the HDR video frame is larger than a third brightness value; when the brightness value of the caption area of the HDR video frame is larger than the third brightness value, adjusting the brightness value of the caption area of the HDR video frame to a target brightness value, wherein the target brightness value is smaller than or equal to the third brightness value; when the luminance value of the subtitle region of the HDR video frame is less than or equal to the third luminance value, the luminance value of the subtitle region of the HDR video frame is not adjusted by the target luminance value. When the ambient light intensity value is less than the preset intensity (i.e., the ambient light is darker), determining the reference luminance value as a fourth luminance value; judging whether the brightness value of the caption area of the HDR video frame is larger than a fourth brightness value; when the brightness value of the caption area of the HDR video frame is larger than the fourth brightness value, adjusting the brightness value of the caption area of the HDR video frame to a target brightness value, wherein the target brightness value is smaller than or equal to the fourth brightness value; when the luminance value of the subtitle region of the HDR video frame is less than or equal to the fourth luminance value, the luminance value of the subtitle region of the HDR video frame is not adjusted by the target luminance value.

The process of adjusting the screen brightness of the display device will be described below with a specific example.

When the display device plays the video, the controller acquires the video parameter information. Judging whether the currently played video is an HDR video or not according to the video parameters, and when the video parameters indicate that the currently played video is the HDR video, controlling a backlight module of a display to work according to brightness data of the currently played video by a controller so as to play the video in an HDR mode. Thereafter, when the display displays the HDR video frame, the controller recognizes whether the currently displayed HDR video frame includes subtitles based on a text recognition algorithm (e.g., optical Character Recognition, OCR). If the currently displayed HDR video frame includes subtitles, a screen luminance value (i.e., the overall luminance value of the HDR video frame) and a luminance value of a subtitle region of the HDR video frame are determined. A reference luminance value is determined from the screen luminance value (i.e., the overall luminance value of the HDR video frame) and the luminance value of the subtitle region of the HDR video frame is adjusted according to the reference luminance value.

Specifically, when the screen luminance value (i.e., the overall luminance value of the HDR video frame) is less than 1000 nits, an ambient light intensity value acquired by a light sensor is acquired, and when the ambient light intensity value is greater than or equal to a preset intensity (i.e., the ambient light is brighter), the reference luminance value is determined to be 300 nits (i.e., the first luminance value); judging whether the luminance value of the subtitle region of the HDR video frame is greater than 300 nits (i.e., a first luminance value); when the luminance value of the subtitle region of the HDR video frame is greater than 300 nit (i.e., the first luminance value), the luminance value of the subtitle region of the HDR video frame is adjusted to be less than 300 nit (i.e., the first luminance value). When the ambient light intensity value is less than the preset intensity (i.e., the ambient light is brighter), determining the reference luminance value as 100 nit (i.e., the second luminance value); judging whether the luminance value of the subtitle region of the HDR video frame is greater than 100 nits (i.e., a second luminance value); when the luminance value of the subtitle region of the HDR video frame is greater than 100 nit (i.e., the second luminance value), the luminance value of the subtitle region of the HDR video frame is adjusted to be less than 100 nit (i.e., the second luminance value).

Acquiring an ambient light intensity value acquired by a light sensor when a screen brightness value (i.e., an overall brightness value of an HDR video frame) is greater than or equal to 1000 nit and the screen brightness value is less than 2000 nit, and determining a reference brightness value as 500 nit (i.e., a third brightness value) when the ambient light intensity value is greater than or equal to a preset intensity (i.e., ambient light is brighter); judging whether the luminance value of the subtitle region of the HDR video frame is greater than 500 nits (i.e., a third luminance value); when the luminance value of the subtitle region of the HDR video frame is greater than 500 nit (i.e., the third luminance value), the luminance value of the subtitle region of the HDR video frame is adjusted to be less than 500 nit (i.e., the third luminance value). When the ambient light intensity value is less than the preset intensity (i.e., the ambient light is brighter), determining the reference luminance value as 200 nit (i.e., the fourth luminance value); judging whether the brightness value of the subtitle region of the HDR video frame is more than 200 nits (namely, a fourth brightness value); when the luminance value of the subtitle region of the HDR video frame is greater than 200 nit (i.e., the fourth luminance value), the luminance value of the subtitle region of the HDR video frame is adjusted to be less than 200 nit (i.e., the fourth luminance value).

Acquiring an ambient light intensity value acquired by a light sensor when a screen brightness value (i.e., an overall brightness value of an HDR video frame) is equal to or greater than 2000 nits, and determining a reference brightness value as 800 nits (i.e., a third brightness value) when the ambient light intensity value is equal to or greater than a preset intensity (i.e., ambient light is brighter); judging whether the brightness value of the subtitle region of the HDR video frame is more than 800 nits (namely, a third brightness value); when the luminance value of the subtitle region of the HDR video frame is greater than 800 nit (i.e., the third luminance value), the luminance value of the subtitle region of the HDR video frame is adjusted to be less than 800 nit (i.e., the third luminance value). When the ambient light intensity value is less than the preset intensity (i.e., the ambient light is brighter), determining the reference luminance value as 200 nit (i.e., the fourth luminance value); judging whether the brightness value of the subtitle region of the HDR video frame is more than 200 nits (namely, a fourth brightness value); when the luminance value of the subtitle region of the HDR video frame is greater than 200 nit (i.e., the fourth luminance value), the luminance value of the subtitle region of the HDR video frame is adjusted to be less than 200 nit (i.e., the fourth luminance value).

In the above embodiment, the controller may adjust the backlight intensities of the plurality of backlight units corresponding to the caption area of the HDR video frame when adjusting the luminance value of the caption area of the HDR video frame.

For example, the controller may adjust the supply voltages of the plurality of backlight units corresponding to the subtitle region of the HDR video frame when adjusting the luminance value of the subtitle region of the HDR video frame. Specifically, the supply voltages of the plurality of backlight units corresponding to the caption area of the HDR video frame are controlled to be increased so that the luminance value of the caption area of the HDR video frame is increased. The power supply voltages of the plurality of backlight units corresponding to the caption area of the HDR video frame are controlled to be reduced so that the luminance value of the caption area of the HDR video frame is reduced.

For example, the controller may adjust the supply currents of the plurality of backlight units corresponding to the caption area of the HDR video frame when adjusting the luminance value of the caption area of the HDR video frame. Specifically, the supply currents of the plurality of backlight units corresponding to the caption area of the HDR video frame are controlled to increase so that the luminance value of the caption area of the HDR video frame increases. The power supply currents of the plurality of backlight units corresponding to the caption area of the HDR video frame are controlled to be reduced so that the luminance value of the caption area of the HDR video frame is reduced.

For example, the controller may adjust the duty ratio of the pulse signals of the plurality of backlight units corresponding to the subtitle region of the HDR video frame when adjusting the luminance value of the subtitle region of the HDR video frame. Specifically, the duty ratio of the pulse signals of the plurality of backlight units corresponding to the caption area of the HDR video frame is controlled to be increased so that the luminance value of the caption area of the HDR video frame is increased. The duty ratio of the pulse signals of the plurality of backlight units corresponding to the caption area of the HDR video frame is controlled to be reduced so that the luminance value of the caption area of the HDR video frame is reduced.

Similarly, when the display displays the HDR video, the brightness of the video may be adjusted by controlling the backlight intensities of the backlight units of the backlight module of the display.

In this embodiment, various ways of adjusting the luminance value of the caption area of the HDR video frame are provided, and further, when the caption area of the HDR video frame is brighter, the luminance value of the caption area of the HDR video frame may be adjusted based on the reference luminance value, so as to avoid the caption area of the HDR video frame from being too bright, and improve the user viewing experience.

The following describes in detail the screen brightness adjustment method according to the embodiment of the present application with reference to fig. 7. The method in this embodiment may be implemented in a display device having the above-described hardware structure or software structure. The display device may include a display and a controller coupled to the display. As shown in fig. 7, the screen brightness adjustment method may include the following steps 710 to 730.

In step 710, in the case where the HDR video frame is displayed and includes subtitles, a screen luminance value of the display device and a luminance value of a subtitle region of the HDR video frame are determined.

Prior to step 710, the method may further include: based on a text recognition algorithm, a subtitle region for an HDR video frame is determined. In implementations, when the display displays the HDR video frame, a text recognition algorithm is based on identifying whether the HDR video frame includes subtitles to determine a subtitle region of the HDR video frame if it is determined that the HDR video frame includes subtitles. In this way, whether the HDR video frame comprises subtitles can be rapidly identified, and after the subtitle region of the HDR video frame is determined, the luminance value of the subtitle region of the HDR video frame is adjusted according to the screen luminance value, so that the response speed can be improved, and the picture delay is avoided.

Prior to step 710, the method may further include: and acquiring video parameter information, and executing the step of identifying whether the HDR video frame comprises subtitles or not based on a text recognition algorithm when the video parameter indicates that the currently played video is the HDR video. Wherein the video parameter information may include slice source type information. In the implementation, when the video is played, the video parameter information is obtained, whether the video played currently is an HDR video is judged according to the video parameter, and when the video parameter indicates that the video played currently is the HDR video, the controller controls the backlight module of the display to work according to the brightness data of the video played currently, and then the video is played in an HDR mode.

Step 720, determining a reference brightness value according to the screen brightness value.

For example, when the screen luminance value of the display device is less than 1000 nit (i.e., the overall luminance value of the HDR video frame is small), the reference luminance value may be 100 nit. For example, when the screen luminance value of the display device is equal to or greater than 1000 nit and the screen luminance value of the display device is less than 2000 nit (i.e., the overall luminance value of the HDR video frame is greater), the reference luminance value may be 300 nit. For example, when the screen luminance value of the display device is equal to or greater than 2000 nit (i.e., the overall luminance value of the HDR video frame is greater), the reference luminance value may be 500 nit.

In step 730, when the luminance value of the caption area is greater than the reference luminance value, the luminance value of the caption area is adjusted according to the reference luminance value, so that the luminance value of the caption area reaches the target luminance value, and the target luminance value is less than or equal to the reference luminance value.

In this embodiment of the present application, when the display displays the HDR video frame, the backlight module is controlled to work according to the luminance data of the HDR video frame, so as to improve the luminance value of the bright pixel point of the HDR video frame, and further present better image quality. And, in the case where the display displays the HDR video frame, if the HDR video frame includes subtitles and the luminance value of the subtitle region of the HDR video frame is greater than the reference luminance value, dimming the luminance value corresponding to the subtitle region of the HDR video frame based on the reference luminance value. In this way, when the display device displays the HDR video frame, the luminance value of the subtitle region of the HDR video frame will not be greatly increased when the overall luminance value of the HDR video frame is increased, so that the bright portion detail and the dark portion detail of the HDR video frame are highlighted, and meanwhile discomfort of eyes of a user caused by too high luminance of the subtitle region can be avoided, thereby improving viewing experience of the user.

In some embodiments, when the display is displaying an HDR video frame, the ambient light intensity value of the display device may also affect the look and feel of the user. When the ambient light intensity value of the display device is large (e.g., the user views a video during daytime), since the external environment is bright, even if the luminance value of the subtitle region of the HDR video frame is larger than the reference luminance value (i.e., the subtitle region of the HDR video frame is bright), discomfort is not caused to the eyes of the user. When the ambient light intensity value of the display device is small (e.g., the user views the video at night), the brightness value of the subtitle region of the HDR video frame is smaller than the reference brightness value, which still causes a dazzling feeling and discomfort to the eyes of the user. Based on this, step 720 may further include: and determining a reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor, and adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value.

Illustratively, determining the reference luminance value from the screen luminance value and the ambient light intensity value collected by the light sensor comprises: determining a reference brightness value as a first brightness value under the condition that the screen brightness value is in a first brightness range and the ambient light intensity value is greater than or equal to a preset intensity value; and determining the reference brightness value as a second brightness value under the condition that the screen brightness value is in the first brightness range and the ambient light intensity value is smaller than the preset intensity value.

Illustratively, determining the reference luminance value from the screen luminance value and the ambient light intensity value collected by the light sensor comprises: determining a reference brightness value as a third brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is greater than or equal to the preset intensity value; wherein the minimum value of the second brightness range is larger than or equal to the maximum value of the first brightness range, and the third brightness value is larger than the first brightness value; determining a reference brightness value as a fourth brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is smaller than the preset intensity value; wherein the fourth luminance value is greater than or equal to the second luminance value.

The following describes a process of screen brightness adjustment in a specific example.

As shown in fig. 8, the screen brightness adjustment method includes steps 801 to 810.

Step 801, when a display device plays a video, acquiring video parameter information;

step 802, judging whether the video currently played is an HDR video according to the video parameter information, if so, executing step 803, otherwise, ending the flow;

step 803, when displaying the HDR video frame, identifying whether the HDR video frame includes a subtitle based on a text recognition algorithm, if so, executing step 804, otherwise, ending the flow;

step 804, determining a screen brightness value and a brightness value of a subtitle region of the HDR video frame;

step 805, judging whether the screen brightness value is less than 1000 nits, if yes, executing step 806, otherwise, executing step 811;

step 806, judging that the ambient light intensity value is greater than or equal to the preset intensity, if yes, executing step 807, otherwise, executing step 809;

step 807, determining the reference luminance value as 300 nit, and judging whether the luminance value of the caption area is greater than 300 nit, if yes, executing step 808, otherwise, ending the flow;

step 808, adjusting the brightness value of the caption area to be less than 300 nits;

Step 809, determining the reference luminance value as 100 nits, and judging whether the luminance value of the caption area is greater than 100 nits, if yes, executing step 810, otherwise, ending the flow;

step 810, adjusting the brightness value of the caption area to be less than 100 nits;

step 811, judging whether the screen brightness value is less than 2000 nits, if yes, executing step 812, otherwise, executing step 817;

step 812, determining that the ambient light intensity value is greater than or equal to the preset intensity, if yes, executing step 813, otherwise, executing step 815;

step 813, determining the reference brightness value as 500 nit, and judging whether the brightness value of the caption area is greater than 500 nit, if yes, executing step 814, otherwise, ending the flow;

step 814, adjusting the brightness value of the caption area to be less than 500 nits;

step 815, determining the reference brightness value as 200 nit, and judging whether the brightness value of the caption area is greater than 200 nit, if yes, executing step 816, otherwise, ending the flow;

step 816, adjusting the brightness value of the caption area to be less than 200 nits;

step 817, determining that the ambient light intensity value is greater than or equal to the preset intensity, if yes, executing step 818, otherwise, executing step 820;

Step 818, determining the reference brightness value as 800 nit, and judging whether the brightness value of the caption area is greater than 800 nit, if yes, executing step 819, otherwise, ending the flow;

step 819, adjusting the luminance value of the caption area to be less than 800 nits;

step 820, determining the reference luminance value as 200 nit, and judging whether the luminance value of the caption area is greater than 200 nit, if yes, executing step 821, otherwise, ending the flow;

in step 821, the luminance value of the caption area is adjusted to be less than 200 nits.

In the embodiment of the application, in the case that the display displays the HDR video frame, if the HDR video frame includes subtitles and the luminance value of the subtitle region of the HDR video frame is greater than the reference luminance value, the reference luminance value is determined according to the screen luminance value and the ambient light intensity value, and the luminance value corresponding to the subtitle region of the HDR video frame is reduced based on the reference luminance value. Thus, when the ambient light is brighter, the brightness value of the subtitle region of the HDR video frame does not need to be adjusted to be too small, and the image quality of the HDR video can be ensured. When the ambient light is darker, the brightness value of the caption area of the HDR video frame is adjusted to be a smaller value, so that the problem of dazzling caused by too bright caption area of the HDR video frame can be avoided, and the watching experience of a user is further improved.

Fig. 9 is a schematic structural diagram of a screen brightness adjusting device according to an embodiment of the present invention. As shown in fig. 9, the screen brightness adjusting apparatus 900 includes: a first determining module 901, configured to determine, in a case where an HDR video frame is displayed and the HDR video frame includes subtitles, a screen luminance value of a display device and a luminance value of a subtitle region of the HDR video frame; a second determining module 902, configured to determine a reference luminance value according to the screen luminance value; the luminance adjustment module 903 is configured to adjust, when the luminance value of the caption area is greater than the reference luminance value, the luminance value of the caption area according to the reference luminance value, so that the luminance value of the caption area reaches a target luminance value, where the target luminance value is less than or equal to the reference luminance value.

In some embodiments, the second determining module 902 is specifically configured to determine the reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor.

In some embodiments, the reference luminance value includes a first luminance value and a second luminance value, the second luminance value being smaller than the first luminance value, the second determining module 902 is specifically configured to: determining a reference brightness value as a first brightness value under the condition that the screen brightness value is in a first brightness range and the ambient light intensity value is greater than or equal to a preset intensity value; and determining the reference brightness value as a second brightness value under the condition that the screen brightness value is in the first brightness range and the ambient light intensity value is smaller than the preset intensity value.

In some embodiments, the reference luminance value includes a third luminance value and a fourth luminance value, the fourth luminance value being less than the third luminance value, the second determining module 902 is specifically configured to: determining a reference brightness value as a third brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is greater than or equal to the preset intensity value; wherein the minimum value of the second brightness range is larger than or equal to the maximum value of the first brightness range, and the third brightness value is larger than the first brightness value; determining a reference brightness value as a fourth brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is smaller than the preset intensity value; wherein the fourth luminance value is greater than or equal to the second luminance value.

In some embodiments, the display includes a display module including a plurality of pixel units distributed in an array, and the first determining module 901 is specifically configured to: determining a maximum brightness value among a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or, determining an average value of a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or determining the screen brightness value of the display device according to the brightness value of the target area of the display device, wherein the target area is an area on the display device, and the distance between the target area and the subtitle area of the HDR video frame is smaller than the preset distance.

In some embodiments, the first determining module 901 is specifically configured to: determining a subtitle region of an HDR video frame based on a text recognition algorithm; a luminance value of a subtitle region of the HDR video frame is determined.

In some embodiments, the display includes a display module and a backlight module for providing light sources of different brightness to the display module; the brightness adjustment module 903 is specifically configured to: adjusting the power supply voltage or power supply current of the backlight module according to the reference brightness value so as to adjust the brightness value of the caption area to be a target brightness value; or, the duty ratio of the pulse signal of the backlight module is adjusted according to the reference brightness value, so that the brightness value of the caption area is adjusted to be the target brightness value.

Embodiments of the present application provide a computer readable storage medium storing at least one executable instruction that, when executed on a display device/apparatus, causes the display device/apparatus to perform a method for adjusting screen brightness in any of the method embodiments described above.

The executable instructions may be particularly useful for causing a display device/apparatus to: under the condition that the next control operation is not received within a preset time period after the control operation is received, responding to the control operation, and acquiring the content to be displayed and the content to be released corresponding to the control operation; and controlling the display to display the content to be displayed and releasing the memory corresponding to the content to be released.

In this embodiment, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. In addition, embodiments of the present application are not directed to any particular programming language.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the present application may be practiced without these specific details. Similarly, in the above description of exemplary embodiments of the application, various features of embodiments of the application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. Wherein the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.

Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Except that at least some of such features and/or processes or elements are mutually exclusive.

It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.

Claims

1. A display device, characterized by comprising:

a display configured to display an HDR video, the HDR video comprising a plurality of consecutive HDR video frames;

a controller coupled with the display and configured to:

determining a screen luminance value of the display device and a luminance value of a subtitle region of the HDR video frame in a case where the display displays the HDR video frame and the HDR video frame includes subtitles;

determining a reference brightness value according to the screen brightness value;

and under the condition that the brightness value of the caption area is larger than the reference brightness value, adjusting the brightness value of the caption area according to the reference brightness value so as to enable the brightness value of the caption area to reach a target brightness value, wherein the target brightness value is smaller than or equal to the reference brightness value.

2. The display device of claim 1, wherein the controller is configured to:

and determining the reference brightness value according to the screen brightness value and the ambient light intensity value acquired by the light sensor.

3. The display device of claim 2, wherein the reference luminance value comprises a first luminance value and a second luminance value, the second luminance value being less than the first luminance value, the controller configured to:

Determining the reference brightness value as a first brightness value under the condition that the screen brightness value is in a first brightness range and the ambient light intensity value is greater than or equal to a preset intensity value;

and determining the reference brightness value as the second brightness value under the condition that the screen brightness value is in the first brightness range and the ambient light intensity value is smaller than a preset intensity value.

4. A display device according to claim 3, wherein the reference luminance value comprises a third luminance value and a fourth luminance value, the fourth luminance value being smaller than the third luminance value, the controller being configured to:

determining the reference brightness value as the third brightness value under the condition that the screen brightness value is in a second brightness range and the ambient light intensity value is greater than or equal to a preset intensity value; wherein the minimum value of the second brightness range is larger than or equal to the maximum value of the first brightness range, and the third brightness value is larger than the first brightness value;

determining the reference brightness value as the fourth brightness value under the condition that the screen brightness value is in the second brightness range and the ambient light intensity value is smaller than a preset intensity value; wherein the fourth luminance value is greater than or equal to the second luminance value.

5. The display device of any one of claims 1-4, wherein the display comprises a display module comprising a plurality of pixel cells distributed in an array; the controller is configured to:

determining a maximum brightness value of a plurality of brightness values corresponding to the pixel units as a screen brightness value of the display device; or,

determining an average value of a plurality of brightness values corresponding to the plurality of pixel units as a screen brightness value of the display device; or,

and determining the screen brightness value of the display equipment according to the brightness value of the target area of the display equipment, wherein the target area is an area, on the display equipment, of which the distance between the target area and the subtitle area of the HDR video frame is smaller than a preset distance.

6. The display device of any of claims 1-4, the controller configured to:

determining a subtitle region of the HDR video frame based on a text recognition algorithm;

a luminance value of a subtitle region of the HDR video frame is determined.

7. The display device of any one of claims 1-4, the display comprising a display module and a backlight module for providing light sources of different brightness to the display module; the controller is configured to:

Adjusting the power supply voltage or power supply current of the backlight module according to the reference brightness value so as to adjust the brightness value of the caption area to the target brightness value; or,

and adjusting the duty ratio of the pulse signal of the backlight module according to the reference brightness value so as to adjust the brightness value of the caption area to the target brightness value.

8. A screen brightness adjustment method applied to the display device according to any one of claims 1 to 7, the method comprising:

in the case of displaying an HDR video frame, and the HDR video frame includes subtitles, determining a screen brightness value of a display device and a brightness value of a subtitle region of the HDR video frame;

9. The method of claim 8, wherein said determining a reference luminance value from said screen luminance value comprises:

10. The method of claim 9, wherein the reference luminance value comprises a first luminance value and a second luminance value, the second luminance value being less than the first luminance value, the determining the reference luminance value based on the screen luminance value and an ambient light intensity value collected by a light sensor comprising: