CN112992028A - Display equipment and control method for eliminating screen display water ripples - Google Patents
Display equipment and control method for eliminating screen display water ripples Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/12—Frame memory handling
Abstract
The present application relates to the field of display device technologies, and in particular, to a display device and a control method for eliminating screen display ripples. The problem of screen display water ripple caused by frame synchronization signals and pulse width modulation signals asynchronism can be solved to a certain extent. The display device includes: the display screen refreshes and displays according to the first frame frequency of the frame synchronization signal; the backlight device is used for emitting light to the display screen according to a first pulse frequency of the pulse width modulation signal; a controller configured to: when the first pulse frequency is judged not to be an integer multiple of the first frame frequency, generating a second pulse frequency with the frequency being a preset integer multiple of the first frame frequency; and sending a pulse width modulation signal with a second pulse frequency to a backlight device, wherein the backlight device emits light to the display screen at the second pulse frequency when the next frame synchronization signal arrives so as to realize the synchronization of the pulse width modulation signal and the frame synchronization signal.
Description
Technical Field
The present application relates to the field of display device technologies, and in particular, to a display device and a control method for eliminating screen display ripples.
Background
The water ripple of a television screen refers to a display condition that occurs when its frame synchronization signal (Vsync) and pulse width modulation signal (PWM) are not synchronized. The intelligent television controller outputs Vsync to a logic board (TCON) to control screen refreshing and outputs a pulse width modulation signal to a backlight driving board to control backlight light emitting, and when a PWN signal for controlling the backlight contains a clock frequency which cannot meet the refreshing clock frequency of a screen, abnormal display conditions such as water ripples and the like of the screen can be caused.
In some implementations to eliminate screen display moire, typically the television will increase the output frequency of the pwm signal, e.g., from 180HZ to 300HZ, to eliminate the moire to some extent, upon detecting that the pwm signal is not synchronized with Vsync.
However, when the power of the television is limited, increasing the frequency of the pwm signal without limit will result in insufficient power of the television, which will affect the normal use of the television. Therefore, a solution is needed to avoid the unlimited increase of the frequency of the pwm signal and to solve the problem of the asynchronization between the frame synchronization signal and the pwm signal.
Disclosure of Invention
In order to solve the problem that screen display water ripples are caused by frame synchronization signals and pulse width modulation signals which are asynchronous, the application provides a display device and a control method for eliminating the screen display water ripples.
The embodiment of the application is realized as follows:
a first aspect of an embodiment of the present application provides a display device, including: the display screen refreshes and displays according to the first frame frequency of the frame synchronization signal; the backlight device is used for emitting light to the display screen according to a first pulse frequency of the pulse width modulation signal; a controller configured to: when the first pulse frequency is judged not to be an integer multiple of the first frame frequency, generating a second pulse frequency with a frequency which is a preset integer multiple of the first frame frequency; and sending a pulse width modulation signal with the second pulse frequency to the backlight device, wherein the pulse width modulation signal is used for enabling the controller to control the backlight device to emit light to the display screen at the second pulse frequency when the next frame synchronization signal arrives, so as to realize the synchronization of the pulse width modulation signal and the frame synchronization signal.
A second aspect of an embodiment of the present application provides a control method for eliminating a screen display ripple, where the method includes: when the first pulse frequency of the pulse width modulation signal for controlling the backlight device to emit light is judged not to be an integer multiple of the first frame frequency of the pulse width modulation signal for controlling the display screen to refresh and display, generating a second pulse frequency with the frequency being a preset integer multiple of the first frame frequency; and sending a pulse width modulation signal with the second pulse frequency to the backlight device, wherein the pulse width modulation signal is used for enabling the backlight device to emit light to the display screen at the second pulse frequency when the next frame synchronization signal arrives, so as to realize the synchronization of the pulse width modulation signal and the frame synchronization signal.
The beneficial effect of this application: by judging the integer multiple relation between the first pulse frequency and the first frame frequency, the abnormal display of the water ripple can be monitored in time; further, by constructing the second pulse frequency, the correction of the frequency of the pulse width modulation signal according to the frequency of the frame synchronization signal can be realized, the instant synchronization of the frame synchronization signal and the pulse width modulation signal is guaranteed by utilizing a software algorithm, and the occurrence of display water ripples on a display screen is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 illustrates a usage scenario of a display device according to some embodiments;
fig. 2 illustrates a hardware configuration block diagram of the control apparatus 100 according to some embodiments;
fig. 3 illustrates a hardware configuration block diagram of the display apparatus 200 according to some embodiments;
FIG. 4 illustrates a software configuration diagram in the display device 200 according to some embodiments;
FIG. 5 illustrates an icon control interface display of an application in display device 200, in accordance with some embodiments;
FIG. 6 is a signal flow diagram illustrating a screen display of a display device according to an embodiment of the present application;
FIG. 7 is a schematic diagram showing a comparison between a frame synchronization signal and a pulse width modulation signal in a display device according to another embodiment of the present application;
FIG. 8A is a schematic diagram showing a comparison between a frame synchronization signal and a pulse width modulation signal in a display device according to another embodiment of the present application;
FIG. 8B is a diagram showing a comparison between a frame synchronization signal and a PWM signal in a display device according to another embodiment of the present application;
FIG. 9 is a schematic diagram showing a comparison between a frame synchronization signal and a pulse width modulation signal in a display device according to another embodiment of the present application;
fig. 10 is a schematic flow chart illustrating a display device generating a second pulse frequency pwm signal according to another embodiment of the present application.
Detailed Description
To make the purpose and embodiments of the present application clearer, the following will clearly and completely describe the exemplary embodiments of the present application with reference to the attached drawings in the exemplary embodiments of the present application, and it is obvious that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
The terms "first," "second," "third," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.
The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements expressly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware or/and software code that is capable of performing the functionality associated with that element.
Fig. 1 is a schematic diagram of a usage scenario of a display device according to an embodiment. As shown in fig. 1, the display apparatus 200 is also in data communication with a server 400, and a user can operate the display apparatus 200 through the smart device 300 or the control device 100.
In some embodiments, the control apparatus 100 may be a remote controller, and the communication between the remote controller and the display device includes at least one of an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, and controls the display device 200 in a wireless or wired manner. The user may control the display apparatus 200 by inputting a user instruction through at least one of a key on a remote controller, a voice input, a control panel input, and the like.
In some embodiments, the smart device 300 may include any of a mobile terminal, a tablet, a computer, a laptop, an AR/VR device, and the like.
In some embodiments, the smart device 300 may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device.
In some embodiments, the smart device 300 and the display device may also be used for communication of data.
In some embodiments, the display device 200 may also be controlled in a manner other than the control apparatus 100 and the smart device 300, for example, the voice instruction control of the user may be directly received by a module configured inside the display device 200 to obtain a voice instruction, or may be received by a voice control apparatus provided outside the display device 200.
In some embodiments, the display device 200 is also in data communication with a server 400. The display device 200 may be allowed to be communicatively connected through a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display apparatus 200. The server 400 may be a cluster or a plurality of clusters, and may include one or more types of servers.
In some embodiments, software steps executed by one step execution agent may be migrated on demand to another step execution agent in data communication therewith for execution. Illustratively, software steps performed by the server may be migrated to be performed on a display device in data communication therewith, and vice versa, as desired.
Fig. 2 exemplarily shows a block diagram of a configuration of the control apparatus 100 according to an exemplary embodiment. 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 input operation instruction from a user and convert the operation instruction into an instruction recognizable and responsive by the display device 200, serving as an interaction intermediary between the user and the display device 200.
In some embodiments, the communication interface 130 is used for external communication, and includes at least one of a WIFI chip, a bluetooth module, NFC, or an alternative module.
In some embodiments, the user input/output interface 140 includes at least one of a microphone, a touchpad, a sensor, a key, or an alternative module.
Fig. 3 shows a hardware configuration block diagram of the display apparatus 200 according to an exemplary embodiment.
In some embodiments, the display apparatus 200 includes at least one of 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 memory, a power supply, a user interface.
In some embodiments the controller comprises a central processor, a video processor, an audio processor, a graphics processor, a RAM, a ROM, a first interface to an nth interface for input/output.
In some embodiments, the display 260 includes a display screen component for displaying pictures, and a driving component for driving image display, a component for receiving image signals from the controller output, displaying video content, image content, and menu manipulation interface, and a user manipulation UI interface, etc.
In some embodiments, the display 260 may be at least one of a liquid crystal display, an OLED display, and a projection display, and may also be a projection device and a projection screen.
In some embodiments, the tuner demodulator 210 receives broadcast television signals via wired or wireless reception, and demodulates audio/video signals, such as EPG data signals, from a plurality of wireless or wired broadcast television signals.
In some embodiments, communicator 220 is a component for communicating with external devices or servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi module, a bluetooth module, a wired ethernet module, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver. The display apparatus 200 may establish transmission and reception of control signals and data signals with the control device 100 or the server 400 through the communicator 220.
In some embodiments, the detector 230 is used to collect signals of the external environment or interaction with the outside. For example, detector 230 includes a light receiver, a sensor for collecting ambient light intensity; alternatively, the detector 230 includes an image collector, such as a camera, which may be used to collect external environment scenes, attributes of the user, or user interaction gestures, or the detector 230 includes a sound collector, such as a microphone, which is used to receive external sounds.
In some embodiments, the external device interface 240 may include, but is not limited to, the following: high Definition Multimedia Interface (HDMI), analog or data high definition component input interface (component), composite video input interface (CVBS), USB input interface (USB), RGB port, and the like. The interface may be a composite input/output interface formed by the plurality of interfaces.
In some embodiments, the controller 250 and the modem 210 may be located in different separate devices, that is, the modem 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.
In some embodiments, the controller 250 controls the operation of the display device and responds to user operations through various software control programs stored in memory. The controller 250 controls the overall operation of the display apparatus 200. For example: in response to receiving a user command for selecting a UI object to be displayed on the display 260, the controller 250 may perform an operation related to the object selected by the user command.
In some embodiments, the object may be any one of selectable objects, such as a hyperlink, an icon, or other actionable control. The operations related to the selected object are: displaying an operation connected to a hyperlink page, document, image, or the like, or performing an operation of a program corresponding to the icon.
In some embodiments the controller comprises at least one of a Central Processing Unit (CPU), a video processor, an audio processor, a Graphics Processing Unit (GPU), a ramandom Access Memory, RAM), ROM (Read-Only Memory), a first to nth interface for input/output, a communication Bus (Bus), and the like.
A CPU processor. For executing operating system and application program instructions stored in the memory, and executing various application programs, data and contents according to various interactive instructions receiving external input, so as to finally display and play various audio-video contents. The CPU processor may include a plurality of processors. E.g. comprising a main processor and one or more sub-processors.
In some embodiments, a graphics processor for generating various graphics objects, such as: at least one of an icon, an operation menu, and a user input instruction display figure. The graphic processor comprises an arithmetic unit, which performs operation by receiving various interactive instructions input by a user and displays various objects according to display attributes; the system also comprises a renderer for rendering various objects obtained based on the arithmetic unit, wherein the rendered objects are used for being displayed on a display.
In some embodiments, the video processor is configured to receive an external video signal, and perform at least one of video processing such as decompression, decoding, scaling, noise reduction, frame rate conversion, resolution conversion, and image synthesis according to a standard codec protocol of the input signal, so as to obtain a signal displayed or played on the direct display device 200.
In some embodiments, the video processor includes at least one of a demultiplexing module, a video decoding module, an image composition module, a frame rate conversion module, a display formatting module, and the like. The demultiplexing module is used for demultiplexing the input audio and video data stream. And the video decoding module is used for processing the video signal after demultiplexing, including decoding, scaling and the like. And the image synthesis module is used for carrying out superposition mixing processing on the GUI signal input by the user or generated by the user and the video image after the zooming processing by the graphic generator so as to generate an image signal for display. And the frame rate conversion module is used for converting the frame rate of the input video. And the display formatting module is used for converting the received video output signal after the frame rate conversion, and changing the signal to be in accordance with the signal of the display format, such as an output RGB data signal.
In some embodiments, the audio processor is configured to receive an external audio signal, decompress and decode the received audio signal according to a standard codec protocol of the input signal, and perform at least one of noise reduction, digital-to-analog conversion, and amplification processing to obtain a sound signal that can be played in the speaker.
In some embodiments, a user may enter user commands on a Graphical User Interface (GUI) displayed on display 260, and the user input interface receives the user input commands through the Graphical User Interface (GUI). Alternatively, the user may input the user command by inputting a specific sound or gesture, and the user input interface receives the user input command by recognizing the sound or gesture through the sensor.
In some embodiments, a "user interface" is a media interface for interaction and information exchange between an application or operating system and a user that enables conversion between an internal form of information and a form that is acceptable to the user. A commonly used presentation form of the User Interface is a Graphical User Interface (GUI), which refers to a User Interface related to computer operations and displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in the display screen of the electronic device, where the control may include 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, etc. visual interface elements.
In some embodiments, user interface 280 is an interface that may be used to receive control inputs (e.g., physical buttons on the body of the display device, or the like).
In some embodiments, a system of a display device may include a Kernel (Kernel), a command parser (shell), a file system, and an application program. The kernel, shell, and file system together make up the basic operating system structure that allows users to manage files, run programs, and use the system. After power-on, the kernel is started, kernel space is activated, hardware is abstracted, hardware parameters are initialized, and virtual memory, a scheduler, signals and interprocess communication (IPC) are operated and maintained. And after the kernel is started, loading the Shell and the user application program. The application program is compiled into machine code after being started, and a process is formed.
Referring to fig. 4, in some embodiments, the system is divided into four layers, which are, from top to bottom, an Application (Applications) layer (referred to as an "Application layer"), an Application Framework (Application Framework) layer (referred to as a "Framework layer"), an Android runtime (Android runtime) layer and a system library layer (referred to as a "system runtime library layer"), and a kernel layer.
In some embodiments, at least one application program runs in the application program layer, and the application programs may be windows (windows) programs carried by an operating system, system setting programs, clock programs or the like; or 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 (API) and a programming framework for the application program of the application layer. The application framework layer includes a number of predefined functions. The application framework layer acts as a processing center that decides to let the applications in the application layer act. The application program can access the resources in the system and obtain the services of the system in execution through the API interface.
As shown in fig. 4, in the embodiment of the present application, the application framework layer includes a manager (Managers), 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 for interacting with all activities running in the system; the Location Manager (Location Manager) is used for providing the system service or application with the access of the system Location service; a Package Manager (Package Manager) for retrieving various information related to an application Package currently installed on the device; a Notification Manager (Notification Manager) for controlling display and clearing of Notification messages; a Window Manager (Window Manager) is used to manage the icons, windows, toolbars, wallpapers, and desktop components on a user interface.
In some embodiments, the activity manager is used to manage the lifecycle of the various applications as well as general navigational fallback functions, such as controlling exit, opening, fallback, etc. of the applications. The window manager is used for managing all window programs, such as obtaining the size of a display screen, judging whether a status bar exists, locking the screen, intercepting the screen, controlling the change of the display window (for example, reducing the display window, displaying a shake, displaying a distortion deformation, and the like), and the like.
In some embodiments, the system runtime layer provides support for the upper layer, i.e., the framework layer, and when the framework layer is used, the android operating system runs the C/C + + library included 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. As shown in fig. 4, the core layer includes at least one of the following drivers: audio drive, display driver, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (like fingerprint sensor, temperature sensor, pressure sensor etc.) and power drive etc..
In some embodiments, the display device may directly enter the interface of the preset vod program after being activated, and the interface of the vod program may include at least a navigation bar 510 and a content display area located below the navigation bar 510, as shown in fig. 5, where the content displayed in the content display area may change according to the change of the selected control in the navigation bar. The programs in the application program layer can be integrated in the video-on-demand program and displayed through one control of the navigation bar, and can also be further displayed after the application control in the navigation bar is selected.
In some embodiments, the display device may directly enter a display interface of a signal source selected last time after being started, or a signal source selection interface, where the signal source may be a preset video-on-demand program, or may be at least one of an HDMI interface, a live tv interface, and the like, and after a user selects different signal sources, the display may display contents obtained from different signal sources.
The embodiment of the application can be applied to various types of display devices (including but not limited to smart televisions, liquid crystal televisions and the like). The following describes a display device and a control method for eliminating screen display water ripples by taking a scheme and a user interface of eliminating screen water ripples of a smart television as an example.
Fig. 6 is a signal flow diagram illustrating a screen display of a display device according to an embodiment of the present application.
In some embodiments, the display device provided herein includes a controller that can control a display screen of the display device, and a backlight. As shown in fig. 6, the display device normally plays video pictures, and requires screen display and backlight device to cooperate at clock frequency. Wherein, the backlight device can be implemented as a light bar and the controller can be implemented as an SOC (System-on-Chip).
The controller may output a screen frame synchronization signal (Vsync) that may control a screen refresh frequency to a logic board (TCON); the controller also outputs a pulse width modulation signal to the backlight driving board, and the pulse width modulation signal adjusts the duration of the high level of the pulse width modulation signal to adjust the duty ratio of the pulse width modulation signal and further control the display brightness of the lamp strip.
The duty ratio refers to the ratio of the high level of the pulse width modulation signal in one period to the whole period; the logic board is responsible for converting frame synchronization signal data output by the SOC into a signal for driving the screen and sending the signal to the screen for controlling refreshing display; the backlight driving board is responsible for receiving pulse width modulation signals output by the SOC and transmitting the pulse width modulation signals to the LED light bars to control light emission.
In some embodiments, the multi-partition independent backlight control simultaneously controls the duty ratio of the light bars of each partition in the same backlight control signal period, and simultaneously controls the brightness of the light bars of each partition according to the calculated backlight data in the current control period, but in a working scene of low duty ratio in a playing video, the waveforms of the light bar currents of each partition are high level for a short time and low level for a long time, so that a repeated switching process from heavy load to light load occurs, that is, a switching process from high level to low level of all backlight light bars is controlled simultaneously.
Fig. 7 is a schematic diagram showing a comparison between a frame synchronization signal and a pulse width modulation signal in a display device according to another embodiment of the present application.
Taking the normal display state of the display device as an example, the frequency of the frame synchronization signal Vsync is 60HZ, the frequency of the pulse width modulation signal is 180HZ, and the screen display at this time is normal because the frequency of the pulse width modulation signal and the frequency of the frame synchronization signal are in integer multiple relation. The frequency of the pulse width modulation signal and the frequency of the frame synchronization signal are in integer multiple relation, and the pulse width modulation signal and the frame synchronization signal can also be understood to keep synchronous.
It can also be understood that an integral number of multiple pulse width modulation signals can be contained in a complete period of one frame synchronization signal, and when the condition is met, the display screen cannot display water ripples; in other words, when the pwm signal included in the complete period of one frame sync signal is not an integer number, the display will show a ripple.
In some embodiments, in one Vsync signal period, the control of each light bar is performed at the same time, in a low duty ratio operating state, that is, in one control period, the light bar current waveforms of each partition are a high level for a short time and a low level for a long time, and M light bars are controlled at the same time, so that a process of heavy load and light load switching frequently occurs, that is, a switching process of controlling all backlight light bars from a high level to a low level simultaneously, at this time, the controller controls and increases the LED current through the light emitting diode, and simultaneously, the duty ratio is reduced to increase the LED lamp voltage drop, so as to control the light emission of the light bars.
In some embodiments, a backlight control system of a display device may include data detection, data processing, a control module, and a control object.
The data detection module is used for acquiring the brightness data of each subarea image through the image, and the modes adopted by different schemes are different. For example, the display data of the light bar partitions are subjected to amplitude limiting processing, and the PWM data are subjected to amplitude limiting processing and scaling processing; the scaling process is data range conversion, and the amplitude limiting process includes the steps of processing the upper and lower amplitudes and limiting the data in a reasonable range. The light bar partition data is used for regional light control, and each partition independently controls the brightness of the light bar; the PWM data is used for controlling the brightness of the whole screen and controlling the brightness of the whole screen to be adjusted up or down simultaneously; and integrating the light bar partition data subjected to amplitude limiting processing and the PWM data subjected to amplitude limiting processing and numerical range conversion, namely multiplying the light bar partition data by the PWM data and integrating the light bar partition data and the PWM data into final brightness data of each partition.
The data processing module is used for processing the brightness data of each subarea acquired by the data detection module into subarea brightness data of an actual television screen end; the control module can sequentially delay the control time of each lamp bar brightness backwards in the same Vsync period, so that the control time of each lamp bar brightness is uniformly distributed in the whole Vsync period; the control object can be each lamp strip of intelligent television screen end.
Fig. 8A is a schematic diagram showing a comparison between a frame synchronization signal and a pwm signal in a display device according to another embodiment of the present application.
Taking the display device for example to display the abnormal state of the ripple, the frequency of the frame synchronization signal Vsync output by the controller is 59HZ, while the frequency of the pulse width modulation signal is kept at 180HZ, and at this time, the frequency of the pulse width modulation signal and the frequency of the frame synchronization signal do not keep an integer multiple relation; the number of pwm signal periods contained in a complete period of a frame sync signal is not an integer, which results in a display screen showing water ripples.
For another example, if the frequency of the frame sync signal Vsync outputted from the controller is 60HZ, but the frequency of the pulse width modulation signal is kept at 235HZ, and the number of the pulse width modulation signal periods included in the entire period of one frame sync signal is not an integer, the display screen may display moire, as shown in fig. 8B. It should be noted that the pulse width modulation signal frequency and the frame synchronization signal frequency are not in an integer multiple relationship, and it can also be understood that the pulse width modulation signal and the frame synchronization signal are not synchronized.
In some embodiments, the controller first determines the brightness to be adjusted of the M light bars, and then performs brightness control on the M light bars in the same Vsync period of the backlight synchronization signal according to the brightness to be adjusted of the M light bars, so that the brightness control time of the M light bars is distributed in a staggered manner in the entire Vsync period.
For example, a light bar region of a backlight device may be implemented to include a plurality of LED lights, wherein the LED lights will serve as a backlight for a liquid crystal display.
And according to the brightness to be adjusted of the M light bars, performing brightness control on the M light bars in the same backlight synchronization signal Vsync period, so that the brightness control time of the M light bars is distributed in the whole Vsync period in a staggered manner.
Under the condition of low duty ratio, namely in any Vsync period, when the proportion of the duration time of the high-level waveforms of the M light bar currents in the Vsync period is smaller than a preset threshold value, in the same backlight synchronization signal Vsync period, the high-level waveforms of the M light bar currents are controlled, so that the control time of the high-level waveforms of the M light bar currents is distributed in the whole Vsync period in a staggered manner. Serial Peripheral Interface (SPI) data requires that all transmissions be completed in one Vsync period, which may be 20ms (50HZ) or 16.7ms (60 HZ).
The preset threshold may be generally implemented as 20%, where the preset threshold is a ratio of a duration of a high-level waveform, which is a first level in a pulse width modulation signal controlling light emission of the backlight device light bar, to the Vsync period, and the preset thresholds may be different according to different schemes.
In some embodiments, the brightness control times of the M light bars are distributed in a staggered manner throughout the Vsync period. In the same Vsync period, the control time of the first light bar brightness is taken as the standard, the control time of the second light bar brightness is delayed backwards by 1.25ms, the control time of the third light bar brightness is delayed backwards by 2.5ms, the control time of the fourth light bar brightness is delayed backwards by 3.75ms., and so on. In some embodiments, the light bar comprises a light emitting diode, LED.
Fig. 9 is a schematic diagram showing a comparison between a frame synchronization signal and a pulse width modulation signal in a display device according to another embodiment of the present application.
In some embodiments, to solve the problem that the frame synchronization signal Vsync for controlling the screen refresh and the pulse width modulation signal for controlling the backlight are not synchronized, the controller employs a mechanism of Vsync interruption and pulse width modulation signal synchronization to achieve synchronization of the Vsync and the pulse width modulation signal.
When playing video, the controller will collect the frequency of the pulse width modulation signal outputted by the controller for controlling the backlight device to emit light, i.e. the first pulse frequency described in this application, and the frequency of the frame synchronization signal for controlling the display screen to refresh, i.e. the first frame frequency described in this application.
The controller detects whether the first pulse frequency is an integer multiple of the first frame frequency in real time. For example, when the display screen has water ripples, the controller detects that the first pulse frequency is no longer an integer multiple of the first frame frequency, and at this time, the controller is triggered to generate a second pulse frequency, wherein the value of the second pulse frequency is a preset integer multiple of the first frame frequency.
When the next frame synchronizing signal of the abnormal occurrence is detected, the controller controls the backlight device to emit light to the display screen displaying the water ripple at the second pulse frequency, so as to realize the synchronization of the pulse width modulation signal and the frame synchronizing signal and eliminate the water ripple.
For example, the frequency of the screen frame synchronization signal Vsync is 59HZ, the frequency of the pulse width modulation signal is 180HZ, and when the controller detects that the pulse width modulation signal is not in a multiple relation with the Vsync, that is, the Vsync and the pulse width modulation signal cannot be synchronized, the controller outputs a software interrupt signaling to the pulse width modulation signal module; the pwm signal module retriggers a pwm signal that is synchronized with the Vsync signal after receiving the software interrupt signaling.
That is, the controller will generate a pulse width modulation signal with frequency of 177HZ according to the screen frame synchronization signal with frequency of 59 HZ; when the next Vsync signal output by the controller SOC comes, the controller controls the light bar by the pulse width modulation signal with the output frequency of 177HZ so as to eliminate the water ripple displayed on the screen.
It should be noted that the controller does not generate the second pulse frequency when the first pulse frequency is an integer multiple of the first frame frequency.
In some embodiments, the display screen of the television displays water ripples, and the controller may modify a waveform of a last pwm signal for controlling the backlight device to emit light when the controller detects that the first pulse frequency is not an integer multiple of the first frame frequency.
For example, according to the second pulse frequency according to the synchronization rule obtained in the foregoing embodiment, the waveform of the last pwm signal when the detection signal is not synchronized is modified, and the duration of the last pwm signal is adjusted according to the obtained second pulse frequency, so as to achieve synchronization with the frame synchronization signal.
In some embodiments, the controller may further control the last pwm signal to perform period adjustment according to the obtained second pulse frequency, and then shift the waveform of the last pwm signal, so that the last pwm signal is synchronized with the frame synchronization signal, thereby solving the problem of non-synchronization between the pwm signal and the frame synchronization signal and eliminating the water ripple of the display screen.
Fig. 10 is a schematic flow chart illustrating a display device generating a second pulse frequency pwm signal according to another embodiment of the present application.
In step 1001, the controller soc outputs the terminal signaling when the pwm signal is not synchronized with the frame synchronization signal.
For example, when the pulse width modulation signal frequency is not an integer multiple of the frame synchronization signal frequency, the controller will generate a first interrupt signaling for interrupting the pulse width modulation signal.
In step 1002, a pulse width modulation signal timer is configured based on interrupt signaling output by a controller.
After the first interrupt signaling is produced, the controller configures a timer for modulating the pulse width modulation signal to a second pulse frequency; the controller then generates a pulse width modulated signal at a second pulse frequency in accordance with the timer.
The controller outputs the pulse width modulation signal to the backlight driving board according to a second pulse frequency and a duty ratio set by the pulse width modulation signal, calculates time T1 of one pulse width modulation signal period according to the set pulse width modulation signal frequency, and calculates duration T2 of high level in one period according to the pulse width modulation signal duty ratio, which can also be called as first time; the controller then controls the timer to output the pulse width modulated signal.
After the interrupt signaling is generated, the controller starts to output the pulse width modulation signal of the second pulse frequency, and at the moment, the timer for setting the pulse width modulation signal starts to time.
In step 1003, the controller outputs according to the set frequency according to the pwm signal.
For example, the pwm signal continues to output a high level time T2, then the level is inverted, and a low level time T1-T2, which may also be referred to as a second time, is output, and at this time, a complete pwm signal cycle is completed; the above output actions are repeated, and the controller can output the pulse width modulation signal in the square wave form.
When the next frame synchronizing signal after the first interrupt signaling is generated arrives, namely the frame synchronizing signal outputs high level, the controller generates the first interrupt signaling for interrupting the pulse width modulation signal;
the controller controls the pulse width modulation signal to output a high level and a low level in sequence according to the first time and the second time contained in the timer so as to generate a pulse width modulation signal with a second frequency.
In step 1004, upon the next arrival of interrupt signaling, the controller stops the current pwm signal timer and reconfigures again to synchronize the pwm signal with the frame sync signal.
For example, the controller generates the second interrupt signaling according to the detection result, stops the pwm signal output based on the configured pwm signal timer when the next Vsync signal high level arrives, reconfigures the timer, and generates the third pulse frequency pwm signal synchronized with the frame synchronization signal at the current time.
When the preset condition is reached, the controller executes steps 1002 to 1004 in a loop manner to keep the pwm signal synchronized with the frame sync signal, so as to avoid the display ripple on the screen.
The method has the advantages that the water ripple abnormal display can be monitored in time by judging the integer multiple relation between the first pulse frequency and the first frame frequency; further, by constructing the second pulse frequency, the correction of the frequency of the pulse width modulation signal according to the frequency of the frame synchronization signal can be realized, the instant synchronization of the frame synchronization signal and the pulse width modulation signal is guaranteed by utilizing a software algorithm, and the occurrence of display water ripples on a display screen is reduced.
Moreover, those skilled in the art will appreciate that aspects of the present application may be illustrated and described in terms of several patentable species or situations, including any new and useful combination of processes, machines, manufacture, or materials, or any new and useful improvement thereon. Accordingly, various aspects of the present application may be embodied entirely in hardware, entirely in software (including firmware, resident software, micro-code, etc.) or in a combination of hardware and software. The above hardware or software may be referred to as "data block", "controller", "engine", "unit", "component", or "system". Furthermore, aspects of the present application may be represented as a computer product, including computer readable program code, embodied in one or more computer readable media.
The computer storage medium may comprise a propagated data signal with the computer program code embodied therewith, for example, on baseband or as part of a carrier wave. The propagated signal may take any of a variety of forms, including electromagnetic, optical, etc., or any suitable combination. A computer storage medium may be any computer-readable medium that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code located on a computer storage medium may be propagated over any suitable medium, including radio, cable, fiber optic cable, RF, or the like, or any combination of the preceding.
Computer program code required for the operation of various portions of the present application may be written in any one or more programming languages, including an object oriented programming language such as Java, Scala, Smalltalk, Eifiel, JADE, Emerald, C + +, C #, VB.NET, Python, and the like, a conventional programming language such as C, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP, a dynamic programming language such as Python, Ruby, and Groovy, or other programming languages, and the like. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any network format, such as a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet), or in a cloud computing environment, or as a service, such as a software as a service (SaaS).
Additionally, the order in which elements and sequences of the processes described herein are processed, the use of alphanumeric characters, or the use of other designations, is not intended to limit the order of the processes and methods described herein, unless explicitly claimed. While various presently contemplated embodiments of the invention have been discussed in the foregoing disclosure by way of example, it is to be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by software-only solutions, such as installing the described system on an existing server or mobile device.
Similarly, it should be noted that in the preceding description of embodiments of the application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to require more features than are expressly recited in the claims. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.
The entire contents of each patent, patent application publication, and other material cited in this application, such as articles, books, specifications, publications, documents, and the like, are hereby incorporated by reference into this application. Except where the application is filed in a manner inconsistent or contrary to the present disclosure, and except where the claim is filed in its broadest scope (whether present or later appended to the application) as well. It is noted that the descriptions, definitions and/or use of terms in this application shall control if they are inconsistent or contrary to the statements and/or uses of the present application in the material attached to this application.
Claims (10)
1. A display device, comprising:
the display screen refreshes and displays according to the first frame frequency of the frame synchronization signal;
the backlight device is used for emitting light to the display screen according to a first pulse frequency of the pulse width modulation signal;
a controller configured to:
when the first pulse frequency is judged not to be an integer multiple of the first frame frequency, generating a second pulse frequency with a frequency which is a preset integer multiple of the first frame frequency;
and sending a pulse width modulation signal with the second pulse frequency to the backlight device, wherein the pulse width modulation signal is used for enabling the controller to control the backlight device to emit light to the display screen at the second pulse frequency when the next frame synchronization signal arrives, so as to realize the synchronization of the pulse width modulation signal and the frame synchronization signal.
2. The display device of claim 1, wherein after the controller generates the second pulse frequency at a preset integer multiple of the first frame frequency, the controller is further configured to:
generating first interrupt signaling for interrupting the pulse width modulated signal, the first interrupt signaling further being used to trigger a timer configured to modulate the pulse width modulated signal to a second pulse frequency, the controller generating the pulse width modulated signal of the second pulse frequency according to the timer.
3. The display device of claim 2, wherein the controller generates the pulse width modulated signal at the second pulse frequency in accordance with the timer, in particular comprising the controller:
the timer includes a first time for outputting a first level, the first time being acquired based on a duty cycle of the pulse width modulation signal, and a second time for outputting a second level, the second time being acquired based on a period of the pulse width modulation signal and the first time;
when the next frame synchronization signal after the first interrupt signaling is generated arrives, the controller controls the pulse width modulation signal to sequentially output a first level and a second level according to the first time and the second time included in the timer so as to generate a pulse width modulation signal with a second pulse frequency.
4. The display device of claim 2, wherein the controller generating first interrupt signaling for interrupting the pulse width modulated signal comprises the controller:
generating first interrupt signaling for interrupting the pulse width modulation signal when the frame synchronization signal outputs a first level.
5. The display device of claim 2, wherein after the controller generates the pulse width modulated signal at the second pulse frequency according to the timer, the controller is further configured to:
when the frame synchronization signal is switched from the first frame frequency to a second frame frequency, the controller generates a second interrupt signaling for interrupting the pulse width modulation signal, wherein the second interrupt signaling is further used for triggering a timer configured to modulate the pulse width modulation signal to a third pulse frequency, and the third pulse frequency is an integer multiple of the second frame frequency.
6. A control method for eliminating water ripples of screen display is characterized by comprising the following steps:
when the first pulse frequency of the pulse width modulation signal for controlling the backlight device to emit light is judged not to be an integer multiple of the first frame frequency of the pulse width modulation signal for controlling the display screen to refresh and display, generating a second pulse frequency with the frequency being a preset integer multiple of the first frame frequency;
and sending a pulse width modulation signal with the second pulse frequency to the backlight device, wherein the pulse width modulation signal is used for enabling the backlight device to emit light to the display screen at the second pulse frequency when the next frame synchronization signal arrives, so as to realize the synchronization of the pulse width modulation signal and the frame synchronization signal.
7. The control method for eliminating screen display moire as claimed in claim 6, wherein after generating the second pulse frequency with a predetermined integer multiple of the first frame frequency, the method further comprises:
generating first interrupt signaling for interrupting the pulse width modulated signal, the first interrupt signaling further being used to trigger a timer configured to modulate the pulse width modulated signal to a second pulse frequency, the pulse width modulated signal of the second pulse frequency being generated according to the timer.
8. The control method for eliminating screen display water ripples according to claim 7, wherein generating the pulse width modulation signal of the second pulse frequency according to the timer specifically comprises:
the timer includes a first time for outputting a first level, the first time being acquired based on a duty cycle of the pulse width modulation signal, and a second time for outputting a second level, the second time being acquired based on a period of the pulse width modulation signal and the first time;
and when the next frame synchronization signal after the first interrupt signaling is generated arrives, controlling the pulse width modulation signal to sequentially output a first level and a second level according to the first time and the second time contained in the timer so as to generate a pulse width modulation signal with a second pulse frequency.
9. The control method for eliminating screen display water ripples according to claim 7, wherein generating a first interrupt signaling for interrupting the pulse width modulation signal specifically comprises:
generating first interrupt signaling for interrupting the pulse width modulation signal when the frame synchronization signal outputs a first level.
10. The control method for eliminating screen display water ripples according to claim 7, wherein after generating the pulse width modulation signal of the second pulse frequency according to the timer, the method further comprises:
and when the frame synchronization signal is switched from the first frame frequency to a second frame frequency, generating second interrupt signaling for interrupting the pulse width modulation signal, wherein the second interrupt signaling is also used for triggering a timer configured to modulate the pulse width modulation signal to a third pulse frequency, and the third pulse frequency is an integer multiple of the second frame frequency.
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Application publication date: 20210618 |