CN113163243A - Display device - Google Patents

Display device Download PDF

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Publication number
CN113163243A
CN113163243A CN202010628436.0A CN202010628436A CN113163243A CN 113163243 A CN113163243 A CN 113163243A CN 202010628436 A CN202010628436 A CN 202010628436A CN 113163243 A CN113163243 A CN 113163243A
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CN
China
Prior art keywords
voltage
circuit
resistor
display screen
display device
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Granted
Application number
CN202010628436.0A
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Chinese (zh)
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CN113163243B (en
Inventor
庞震华
张洪浩
孙学斌
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Hisense Visual Technology Co Ltd
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Hisense Visual Technology Co Ltd
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Publication of CN113163243A publication Critical patent/CN113163243A/en
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Publication of CN113163243B publication Critical patent/CN113163243B/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/4104Peripherals receiving signals from specially adapted client devices
    • H04N21/4122Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/04Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/422Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42204User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/422Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42204User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor
    • H04N21/42206User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor characterized by hardware details
    • H04N21/4222Remote control device emulator integrated into a non-television apparatus, e.g. a PDA, media center or smart toy
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals
    • H04N21/422Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42204User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor
    • H04N21/42206User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor characterized by hardware details
    • H04N21/42221Transmission circuitry, e.g. infrared [IR] or radio frequency [RF]

Abstract

The invention provides a display device, which comprises a host and a display screen, wherein the host is connected with the display screen through a connecting wire, the host comprises a power panel used for providing electric energy for the display screen through the connecting wire, and an AC-DC feedback circuit used for controlling the power panel to output stable direct current is arranged on the power panel. The AC-DC feedback circuit is arranged on the power panel of the host machine, the power panel is controlled to output stable direct current, the direct current is output to the display screen through the connecting wire, and electric energy is provided for the display screen.

Description

Display device
The present application claims priority from the chinese patent application filed on 22.01.2020, having application number 2020100747123 and entitled "display device," the entire contents of which are incorporated herein by reference.
Technical Field
The present invention relates to electronic technologies, and in particular, to a display device.
Background
Currently, a split display device, such as a split tv, is a new tv format. In the split type television, the host provides image pictures for the independent display screen and supplies power to the display screen, so that the independent display screen can be designed to be lighter and thinner.
At present, an effective scheme for controlling the stability of the output direct current when a host supplies power to a display screen is lacking.
Disclosure of Invention
The application provides a display device, wherein an AC-DC feedback circuit arranged on a power panel of a host can regulate the voltage stabilization output of an AC-DC circuit according to the output voltage of a voltage conversion circuit, and further provide stable direct current for a display screen.
The display device includes:
a host and a display screen; the host is connected with the display screen through a connecting wire;
the host comprises a power panel for providing electric energy to the display screen through the connecting line;
and the power panel is provided with an AC-DC feedback circuit for converting AC into DC, and is used for controlling the power panel to output stable DC.
Further, the AC-DC feedback circuit includes: an optical coupling circuit and a voltage stabilizing circuit;
the voltage stabilizing circuit is connected with the optical coupling circuit;
the voltage stabilizing circuit is used for controlling the voltage of the AC-DC feedback circuit to be in a safe voltage range;
the optical coupling circuit is used for outputting a feedback signal to a switch controller on the power panel, so that the switch controller outputs a stable pulse signal to the voltage conversion circuit according to the feedback signal.
Further, the voltage stabilizing circuit includes:
a voltage regulator circuit and a voltage reference circuit;
the voltage reference circuit is connected between the voltage stabilizing power supply circuit and the optical coupling circuit;
the voltage stabilizing power supply circuit and the voltage reference circuit are also respectively connected with the output end of the voltage conversion circuit on the power panel;
the voltage stabilizing source circuit is used for reducing the first voltage output by the voltage conversion circuit into a second voltage; the second voltage is a safe voltage specified by a reference source device in the voltage reference circuit, and the reference source device is an element for providing a reference voltage;
the voltage reference circuit is used for carrying out voltage regulation according to the second voltage and a preset reference voltage so as to stabilize the voltage of the AC-DC feedback circuit.
In one specific implementation, the regulator circuit includes:
the voltage-stabilizing circuit comprises a divider resistor, a field effect transistor, a bias resistor, a filter capacitor and a voltage-stabilizing tube;
one end of the voltage dividing resistor is connected with the output end of the voltage conversion circuit, and the other end of the voltage dividing resistor is respectively connected with one end of the bias resistor and the drain electrode of the field effect transistor;
the grid electrode of the field effect transistor is connected with the other end of the bias resistor and then connected with the negative electrode of the voltage stabilizing tube;
and the source electrode of the field effect transistor is connected with one end of the filter capacitor, and the filter capacitor is grounded after being connected with the anode of the voltage stabilizing tube.
Optionally, the voltage dividing resistor includes a first voltage dividing resistor and a second voltage dividing resistor;
the first voltage-dividing resistor is connected in series with the second voltage-dividing resistor.
In one particular implementation, the voltage reference circuit includes:
the circuit comprises a reference source device, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;
the first resistor, the second resistor and the third resistor are sequentially connected in series, one end of the first resistor is connected with the output end of the voltage conversion circuit, and one end of the third resistor is connected with the anode of the reference source device;
one end of the fourth resistor is connected between the second resistor and the third resistor; the other end of the fourth resistor is connected with the cathode of the reference source device after being connected with the first capacitor;
and the reference electrode of the reference source device is connected between the second resistor and the third resistor, and the anode of the reference source device is grounded.
Further, the optocoupler circuit includes:
an optical coupler and a voltage divider circuit;
the optical coupler is connected with the voltage division circuit;
the voltage division circuit is used for reducing the voltage of the light emitting source end of the optical coupler;
the optical coupler is used for sending a feedback signal to the switch controller.
Further, the optical coupler includes:
a light emitting source and a light receiving device;
and the pin of the luminous source is connected with the voltage division circuit, and the pin of the light receiver is connected with the feedback pin of the switch controller.
Optionally, the voltage divider circuit includes:
a fifth resistor and a sixth resistor;
one end of the fifth resistor is connected between the field effect transistor and the filter capacitor in the voltage stabilizing circuit, and the other end of the fifth resistor is connected with the first pin of the luminous source;
and two ends of the sixth resistor are respectively connected with the first pin and the second pin of the light-emitting source.
Furthermore, a first pin of the light receiver is connected with a feedback pin of the switch controller, and a second pin of the light receiver is grounded.
According to the display device provided by the embodiment of the application, the AC-DC feedback circuit is arranged on the power panel of the host, the power panel is controlled to output stable direct current, the direct current is output to the display screen through the connecting wire, and electric energy is provided for the display screen.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control device according to an embodiment;
fig. 2 is a block diagram schematically showing a configuration of the control apparatus 100 according to an exemplary embodiment;
fig. 3 is a diagram schematically illustrating a hardware configuration of a hardware system in the display apparatus 200 according to the exemplary embodiment;
FIG. 4 is a schematic diagram of an interface on a display device;
FIG. 5 is a schematic diagram showing the connection of a power strip to a load;
fig. 6 is a block diagram illustrating an exemplary hardware architecture of the display apparatus 200 according to fig. 2, 3 or 4;
fig. 7 is a diagram schematically illustrating a functional configuration of a display device according to an exemplary embodiment;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an AC-DC feedback circuit according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an AC-DC feedback circuit according to another embodiment of the present application;
fig. 11 is a schematic structural diagram of an AC-DC feedback circuit according to another embodiment of the present application;
fig. 12 is a schematic structural diagram of an AC-DC feedback circuit according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application is directed to a display device having a rotatable display screen, and the structure, function, and implementation of the display device will be described in detail first.
Some display devices with split type are currently a new type, for example: a split TV. The separate type display apparatus can separate the display screen from the display apparatus main body as a separate structure setting, that is, the separate type display apparatus includes at least: a host (which may be referred to as a "box" in some specific product implementations), and a display screen connected to the host; the host is used for generating display content, connecting a power supply and the like, the host also supplies power to the display screen and transmits the content to be displayed to the display screen for display, and the display device is used for displaying the content to be displayed transmitted by the host. By adopting the split structure, the display screen of the display device can be thinner and thinner.
More specifically, the application discloses rotatable split type display device can realize display device's display screen's rotation to and reduce the complexity of the connecting wire between display device host computer and the display screen. The display screen can rotate in the installation plane, for example, the display screen is parallel to the wall surface and is installed on the wall body, then the installation screen of the display screen is parallel to the wall surface, and the display screen can rotate 360 degrees in the installation plane parallel to the wall surface.
The concept to which the present application relates will be first explained below with reference to the drawings. It should be noted that the following descriptions of the concepts are only for the purpose of facilitating understanding of the contents of the present application, and do not represent limitations on the scope of the present application.
The term "module," as used in various embodiments of the present application, may refer to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and/or software code that is capable of performing the functionality associated with that element.
The term "remote control" as used in the various embodiments of the present application refers to a component of an electronic device (e.g., a display device as disclosed herein) that is capable of wirelessly controlling the electronic device, typically over a relatively short distance. The component may typically be connected to the electronic device using infrared and/or Radio Frequency (RF) signals and/or bluetooth, and may also include functional modules such as WiFi, wireless USB, bluetooth, motion sensors, etc. For example: the hand-held touch remote controller replaces most of the physical built-in hardware in the common remote control device with the user interface in the touch screen.
The term "gesture" as used in the embodiments of the present application refers to a user behavior used to express an intended idea, action, purpose, or result through a change in hand shape or an action such as hand movement.
The term "hardware system" used in the embodiments of the present application may refer to a physical component having computing, controlling, storing, inputting and outputting functions, which is formed by a mechanical, optical, electrical and magnetic device such as an Integrated Circuit (IC), a Printed Circuit Board (PCB) and the like. In various embodiments of the present application, a hardware system may also be referred to as a motherboard (or chip).
Fig. 1 is a schematic diagram illustrating an operation scenario between a display device and a control device according to an embodiment. As shown in fig. 1, a user may operate the display device 200 through the control device 100.
The control device 100 may be a remote controller 100A, which can communicate with the display device 200 through an infrared protocol communication, a bluetooth protocol communication, a ZigBee (ZigBee) protocol communication, or other short-range communication, and is used to control the display device 200 through a wireless or other wired manner. The user can input a user instruction through a key on the remote controller 100A, voice input, control panel input, or the like to control the display apparatus 200. Such as: the user can input a corresponding control command through a volume up/down key, a channel control key, up/down/left/right movement keys, a voice input key, a menu key, a power on/off key, etc. on the remote controller 100A to control the functions of the display device 200.
The control device 100 may also be an intelligent device, such as a mobile terminal 100B, a tablet computer, a notebook computer, etc., which may communicate with the display device 200 through a Local Area Network (LAN), a Wide Area Network (WAN), a Wireless Local Area Network (WLAN), or other networks, and implement control of the display device 200 through an application program corresponding to the display device 200. For example, the display apparatus 200 is controlled using an application program running on a smart device. The application may provide various controls to the User through an intuitive User Interface (UI) on a screen associated with the smart device.
For example, the mobile terminal 100B and the display device 200 may each be installed with a software application, so that connection communication between the two can be realized through a network communication protocol, and the purpose of one-to-one control operation and data communication can be further realized. Such as: a control instruction protocol can be established between the mobile terminal 100B and the display device 200, a remote control keyboard is synchronized to the mobile terminal 100B, and the function of controlling the display device 200 is realized by controlling a user interface on the mobile terminal 100B; the audio/video content displayed on the mobile terminal 100B may also be transmitted to the display device 200, so as to implement a synchronous display function.
As shown in fig. 1, the display device 200 may also perform data communication with the server 300 through various communication means. In various embodiments of the present application, the display device 200 may be allowed to be in wired or wireless communication connection with the server 300 through a local area network, a wireless local area network, or other network. The server 300 may provide various contents and interactions to the display apparatus 200.
Illustratively, the display device 200 receives software Program updates, or accesses a remotely stored digital media library by sending and receiving information, and Electronic Program Guide (EPG) interactions. The servers 300 may be a group or groups, and may be one or more types of servers. Other web service contents such as a video on demand and an advertisement service are provided through the server 300.
The display device 200 includes a display screen 201 and a host 202, wherein the display screen 201 is connected to the host 202 through a connection line 203. More specifically, the host 202 may be connected to a power source and transmit a power signal to the display screen 201 through the connection line 203, thereby supplying power to the display screen 201. Meanwhile, the host 202 may further obtain the content to be displayed from the server 300, and transmit the content to be displayed to the display screen 201 through the connection line 203 in an electrical signal manner, so that the display screen 201 displays the received content to be displayed.
The display device 200 may be, on one hand, a liquid crystal display, an oled (organic Light Emitting diode) display, or a projection display device; on the other hand, the display device can be a display system consisting of an intelligent television or a display and a set-top box. The specific display device type, size, resolution, etc. are not limited, and those skilled in the art will appreciate that the display device 200 may be modified in performance and configuration as desired.
The display apparatus 200 may additionally provide an intelligent network tv function providing a computer support function in addition to the broadcast receiving tv function. Examples include a web tv, a smart tv, an Internet Protocol Tv (IPTV), and the like. In some embodiments, the display device may not have a broadcast receiving television function.
In other examples, more or less functionality may be added. The function of the display device is not particularly limited in the present application.
Fig. 2 is a block diagram schematically showing the configuration of the control apparatus 100 according to the exemplary embodiment. As shown in fig. 2, the control device 100 includes a controller 110, a communicator 130, a user input/output interface 140, a memory 190, and a power supply 180.
The control device 100 is configured to control the display device 200, and to receive an input operation instruction from a user, and to convert the operation instruction into an instruction recognizable and responsive by the display device 200, and to mediate interaction between the user and the display device 200. Such as: the user operates the channel up/down key on the control device 100, and the display device 200 responds to the channel up/down operation.
In some embodiments, the control device 100 may be a smart device. Such as: the control apparatus 100 may install various applications for controlling the display apparatus 200 according to user's demands.
In some embodiments, as shown in fig. 1, the mobile terminal 100B or other intelligent electronic device may function similar to the control device 100 after an application for manipulating the display device 200 is installed. Such as: the user may implement the functions of controlling the physical keys of the apparatus 100 by installing applications, various function keys or virtual buttons of a graphical user interface available on the mobile terminal 100B or other intelligent electronic devices.
The controller 110 includes a processor 112, a RAM 113 and a ROM 114, a communication interface, and a communication bus. The controller 110 is used to control the operation of the control device 100, as well as the internal components for communication and coordination and external and internal data processing functions.
The communicator 130 enables communication of control signals and data signals with the display device 200 under the control of the controller 110. Such as: the received user input signal is transmitted to the display device 200. The communicator 130 may include at least one of a WIFI module 131, a bluetooth module 132, an NFC module 133, and the like.
A user input/output interface 140, wherein the input interface includes at least one of a microphone 141, a touch pad 142, a sensor 143, a key 144, a camera 145, and the like. Such as: the user can realize a user instruction input function through actions such as voice, touch, gesture, pressing, and the like, and the input interface converts the received analog signal into a digital signal and converts the digital signal into a corresponding instruction signal, and sends the instruction signal to the display device 200.
The output interface includes an interface that transmits the received user instruction to the display device 200. In some embodiments, it may be an infrared interface or a radio frequency interface. Such as: when the infrared signal interface is used, the user input command needs to be converted into an infrared control signal according to an infrared control protocol, and the infrared control signal is sent to the display device 200 through the infrared sending module. The following steps are repeated: when the rf signal interface is used, a user input command needs to be converted into a digital signal, and then the digital signal is modulated according to the rf control signal modulation protocol and then transmitted to the display device 200 through the rf transmitting terminal.
In some embodiments, the control device 100 includes at least one of a communicator 130 and an output interface. The communicator 130 is configured in the control device 100, such as: the modules of WIFI, bluetooth, NFC, etc. may send the user input command to the display device 200 through the WIFI protocol, or the bluetooth protocol, or the NFC protocol code.
And a memory 190 for storing various operation programs, data and applications for driving and controlling the control apparatus 100 under the control of the controller 110. The memory 190 may store various control signal commands input by a user.
And a power supply 180 for providing operation power support for each electrical component of the control device 100 under the control of the controller 110. The power supply 180 may be powered by a battery and associated control circuitry.
In particular, the core idea of the display device with the rotatable display screen provided by the embodiment of the present application is that the display device is specially configured for some special scenes, such as taking a picture, shaking a sound, singing, and the like, and in the scene, the effect of the vertical screen is better than that of the horizontal screen. In addition, as a specific implementation, the rotary television is a split television design, and comprises a screen end and a box end, wherein the screen end is only a display screen and a TCON; the box end is provided with a power panel, a mainboard, a sound and the like. They are transmitted by optical fiber lines.
Fig. 3 is a diagram schematically illustrating a hardware configuration of a hardware system in the display apparatus 200 according to the exemplary embodiment. For convenience of explanation, the display device 200 in fig. 3 is illustrated by using a liquid crystal display screen as an example.
Fig. 3 is a diagram schematically illustrating a hardware configuration of a hardware system in the display apparatus 200 according to the exemplary embodiment. For convenience of explanation, the display device 200 in fig. 3 is illustrated by using a liquid crystal display screen as an example.
As shown in fig. 3, the display device 200 includes: a panel 1, a backlight assembly 2, a rear case 5, and a chassis 6. Wherein, the panel 1 is used for presenting pictures for users; the backlight assembly 2 is disposed below the panel 1, and is generally an optical assembly for providing sufficient light source with uniform brightness and distribution to enable the panel 1 to normally display images, and the backlight assembly 2 further includes a back plate 20; the rear shell 5 is covered on the panel 1 to hide the parts of the display device such as the backlight assembly 2 and the like, thereby achieving the effect of beautiful appearance; and a base 6 for supporting the display device.
Further, the display device is connected to a host (tv box) of the display device 200 through an HI-LINK data line, the host is further connected to a power adapter through an AC data line, and the host is disposed with a motherboard 3 and a power board 4. Therefore, fig. 4 is a schematic diagram of an interface on a display device, and the display device may be provided with an HI-LINK interface for connecting an HI-LINK data line, and may also be provided with a TYPE-C interface.
Optionally, the host of the display device also includes a main board and a power board, where the main board is configured to generate the content to be displayed and send the content to the main board of the display screen through the HI-LINK data line, so that the display device displays the content to be displayed.
Optionally, a key sheet 35 is further included in fig. 3, and the key sheet 35 may be disposed on a back plate of the display device, which is not limited in this application.
In addition, the display device 200 further includes a sound reproducing device (not shown), such as an audio component, e.g., an I2S interface including a power Amplifier (AMP) and a Speaker (Speaker), for realizing sound reproduction. Usually, the sound components are capable of realizing sound output of at least two sound channels; when the panoramic surround effect is to be achieved, a plurality of acoustic components are required to be arranged to output sounds of a plurality of sound channels, and a detailed description thereof is omitted.
It should be noted that the display device of the display device 200 may also be an OLED display screen, so that the template included in the display device 200 is changed accordingly, which is not described herein too much.
Fig. 5 is a schematic diagram illustrating a connection relationship between a power board and a load, and fig. 5 illustrates a possible connection relationship between the power board and the load IN a display device, IN which the power board 4 of a host includes an input terminal IN and an output terminal OUT (a first output terminal OUT1, a second output terminal OUT2, a third output terminal OUT3 and a fourth output terminal OUT4 are illustrated), wherein the input terminal IN is connected to a commercial power, the output terminal OUT is connected to a load, for example, the first output terminal OUT1 is connected to a sound component, the second output terminal OUT2 is connected to a main board, and the third output terminal OUT3 is connected to a first display driving board 33. In addition, the fourth output terminal OUT4 is connected to the display screen, and the host computer of the display device transmits the power to the display screen through the HI-LINK connection line, for example, the power can be transmitted to the main board of the display screen to supply power to the display screen. The power board 4 needs to convert ac power into dc power required by the load and the display screen, and the dc power is usually of different specifications, for example, 18V is required for the audio components, 12V/18V is required for the main board 31, and so on.
The system architecture of the display device of the present application is further described below with reference to fig. 6. It should be noted that fig. 6 is only an exemplary illustration and does not represent a limitation of the present application. In actual implementation, more or less hardware or interfaces may be included as desired.
Fig. 6 is a block diagram illustrating an exemplary hardware architecture of the display apparatus 200 according to fig. 2, 3 or 4. As shown in fig. 5, the hardware system of the display device 200 may include a controller, and modules connected to the controller through various interfaces.
Wherein the controller may be provided on the interactive board 32 shown in fig. 2 or on the main board 3 shown in fig. 3. Alternatively, the controller may include a tuning demodulator 220, a communicator 230, an external device interface 250, a first controller 210, a memory 290, a user input interface 260-3, a video processor 260-1, an audio processor 260-2, a display screen 280 (the display screen 280 is connected through a HI-LINK connection line), an audio output interface 270, a power supply module 240, a detector 340, an external device interface 350, and a video processor 360. The controller may include more or fewer modules in other embodiments.
The tuning demodulator 220 is configured to perform modulation and demodulation processing such as amplification, mixing, resonance and the like on a broadcast television signal received in a wired or wireless manner, so as to demodulate an audio/video signal carried in a frequency of a television channel selected by a user and additional information (e.g., an EPG data signal) from a plurality of wireless or wired broadcast television signals. Depending on the broadcast system of the television signal, the signal path of the tuner 220 may be various, such as: terrestrial broadcasting, cable broadcasting, satellite broadcasting, internet broadcasting, or the like; according to different modulation types, the adjustment mode of the signal can be a digital modulation mode or an analog modulation mode; and depending on the type of television signal being received, tuner demodulator 220 may demodulate analog and/or digital signals.
The tuner demodulator 220 is also operative to respond to the user-selected television channel frequency and the television signals carried thereby, in accordance with the user selection, and as controlled by the controller 210.
In other exemplary embodiments, the tuner/demodulator 220 may be in an external device, such as an external set-top box. In this way, the set-top box outputs television audio/video signals after modulation and demodulation, and the television audio/video signals are input into the display device 200 through the external device interface 250.
The communicator 230 is a component for communicating with an external device or an external server according to various communication protocol types. For example: the communicator 230 may include a WIFI module 231, a bluetooth communication protocol module 232, a wired ethernet communication protocol module 233, and other network communication protocol modules such as an infrared communication protocol module or a near field communication protocol module (not shown).
The display apparatus 200 may establish a connection of a control signal and a data signal with an external control device or a content providing device through the communicator 230. For example, the communicator may receive a control signal of the remote controller 100 according to the control of the first controller 210.
The external device interface 250 is a component for providing data transmission between the N-chip first controller 210 and the a-chip and other external devices. The external device interface 250 may be connected with an external apparatus such as a set-top box, a game device, a notebook computer, etc. in a wired/wireless manner, and may receive data such as a video signal (e.g., moving image), an audio signal (e.g., music), additional information (e.g., EPG), etc. of the external apparatus.
In some embodiments, the display device is further connected to one or more sensors through an external device interface. The one or more sensors include, but are not limited to: acceleration sensors, gyroscope sensors, pressure sensors, fingerprint sensors, optical sensors, and proximity sensors.
The acceleration sensor can detect the magnitude of acceleration on three coordinate axes of a coordinate system established with the bluetooth device. For example, an acceleration sensor may be used to detect the components of the gravitational acceleration in three coordinate axes. The processor may control the touch screen 805 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor. The acceleration sensor may also be used for game or user motion data acquisition.
The gyroscope sensor can detect the organism direction and the turned angle of the bluetooth device, and the gyroscope sensor can cooperate with the acceleration sensor to acquire the 3D action of the user on the bluetooth device. The processor can realize the following functions according to the data collected by the gyroscope sensor: motion sensing (such as changing the UI according to a user's tilting operation), image stabilization at the time of photographing, game control, and inertial navigation.
The pressure sensor can be arranged on the side frame of the Bluetooth device and/or on the lower layer of the touch display screen. When pressure sensor set up the side frame at bluetooth equipment, can detect the user to the signal of gripping of bluetooth equipment, grip the signal by the treater according to pressure sensor collection and carry out left right hand discernment or swift operation. When the pressure sensor is arranged at the lower layer of the touch display screen, the processor controls the operable control on the UI interface according to the pressure operation of the user on the touch display screen. The operability control comprises at least one of a button control, a scroll bar control, an icon control and a menu control.
The fingerprint sensor is used for collecting fingerprints of users, and the identity of the users is identified by the processor according to the fingerprints collected by the fingerprint sensor, or the identity of the users is identified by the fingerprint sensor according to the collected fingerprints. And when the identity of the user is identified as a credible identity, the processor authorizes the user to execute relevant sensitive operations, wherein the sensitive operations comprise screen unlocking, encrypted information viewing, software downloading, payment, setting change and the like. The fingerprint sensor may be provided on the front, back or side of the bluetooth device. When a physical button or a manufacturer Logo is provided on the bluetooth device, the fingerprint sensor may be integrated with the physical button or the manufacturer Logo.
The optical sensor is used for collecting the intensity of ambient light. In one embodiment, the processor may control the display brightness of the touch display screen based on the ambient light intensity collected by the optical sensor. Specifically, when the ambient light intensity is higher, the display brightness of the touch display screen is increased; and when the ambient light intensity is lower, the display brightness of the touch display screen is reduced. In another embodiment, the processor may also dynamically adjust the shooting parameters of camera head assembly 806 based on the ambient light intensity collected by the optical sensor.
Proximity sensors, also known as distance sensors, are typically provided on the front panel of the bluetooth device. The proximity sensor is used to collect the distance between the user and the front of the bluetooth device. In one embodiment, when the proximity sensor detects that the distance between the user and the front face of the Bluetooth device is gradually reduced, the processor controls the touch display screen to be switched from a bright screen state to a dark screen state; when the proximity sensor detects that the distance between the user and the front face of the Bluetooth device is gradually increased, the processor controls the touch display screen to be switched from the screen-off state to the screen-on state.
The external device interface 250 may include: HI-LINK interface and TYPE-C interface. A High Definition Multimedia Interface (HDMI) terminal also referred to as HDMI 251, a Composite Video Blanking Sync (CVBS) terminal also referred to as AV 252, an analog or digital component terminal also referred to as component 253, a Universal Serial Bus (USB) terminal 254, a Red Green Blue (RGB) terminal (not shown in the figure), and the like. The number and type of external device interfaces are not limited by this application.
The first controller 210 controls the operation of the display apparatus 200 and responds to the operation of the user by running various software control programs (e.g., an operating system and/or various application programs) stored on the memory 290.
As shown in fig. 5, the first controller 210 includes a read only memory RAM 213, a random access memory ROM 214, a graphic processor 216, a CPU processor 212, a communication interface 218, and a communication bus. The RAM 213 and the ROM 214, the graphic processor 216, the CPU processor 212, and the communication interface 218 are connected via a bus.
A ROM 213 for storing instructions for various system boots. If the display device 200 is powered on when a power-on signal is received, the CPU processor 212 executes a system boot instruction in the ROM and copies the operating system stored in the memory 290 to the RAM 214 to start running the boot operating system. After the start of the operating system is completed, the CPU processor 212 copies the various application programs in the memory 290 to the RAM 214, and then starts running and starting the various application programs.
A graphics processor 216 for generating various graphics objects, such as: icons, operation menus, user input instruction display graphics, and the like. The display device comprises an arithmetic unit which carries out operation by receiving various interactive instructions input by a user and displays various objects according to display attributes. And a renderer for generating various objects based on the operator, and the rendered result is transmitted to the display device 280 through the HI-LINK data line and displayed by the display screen 280.
A CPU processor 212 for executing operating system and application program instructions stored in memory 290. And executing various application programs, data and contents according to various interactive instructions received from the outside so as to finally display and play various audio and video contents.
In some exemplary embodiments, the CPU processor 212 may include a plurality of processors. The plurality of processors may include a main processor and a plurality of or a sub-processor. A main processor for performing some operations of the display apparatus 200 in a pre-power-up mode and/or operations for displaying a screen in a normal mode. A plurality of or one sub-processor for performing an operation in a standby mode or the like.
The communication interface 218 may include a first interface 218-1 through an nth interface 218-n. These interfaces may be network interfaces that are connected to external devices via a network.
The first controller 210 may control operations of the display apparatus 200 in relation to the display screen 280. For example: in response to receiving a user command for selecting a UI object to be displayed on the display screen 280, the first controller 210 may perform an operation related to the object selected by the user command.
Wherein the object may be any one of selectable objects, such as a hyperlink or an icon. Operations related to the selected object, such as: displaying an operation connected to a hyperlink page, document, image, or the like, or performing an operation of a program corresponding to an icon. The user command for selecting the UI object may be a command input through various input devices (e.g., a mouse, a keyboard, a touch pad, etc.) connected to the display device 200 or a voice command corresponding to a voice spoken by the user.
The memory 290 includes various software modules for driving and controlling the display apparatus 200. Such as: various software modules stored in memory 290, including: a base module, a detection module, a communication module, a display control module, a browser module, and various service modules, etc. (not shown in the figure).
The basic module is a bottom layer software module for signal communication between hardware in the display device 200 and for sending processing and control signals to an upper layer module. The detection module is a management module used for collecting various information from various sensors or user input interfaces, and performing digital-to-analog conversion and analysis management. The voice recognition module comprises a voice analysis module and a voice instruction database module. The display control module is a module for controlling the first display screen 280 to display image content, and may be used to play information such as multimedia image content and UI interface. The communication module is used for carrying out control and data communication with external equipment. And the browser module is used for executing data communication between the browsing servers. The service module is a module for providing various services and various application programs.
Meanwhile, the memory 290 is also used to store visual effect maps and the like for receiving external data and user data, images of respective items in various user interfaces, and a focus object.
A user input interface 260-3 for transmitting an input signal of a user to the first controller 210 or transmitting a signal output from the first controller 210 to the user. For example, the control device (e.g., a mobile terminal or a remote controller) may transmit an input signal, such as a power switch signal, a channel selection signal, a volume adjustment signal, etc., input by the user to the user input interface, and then the input signal is forwarded to the first controller 210 through the user input interface 260-3; alternatively, the control device may receive an output signal such as audio, video or data processed by the first controller 210 and output from the user input interface 260-3, and display or output the received output signal in audio or vibration form.
In some embodiments, the user may input a user command on a Graphical User Interface (GUI) displayed on the first display screen 280, and the user input interface 260-3 receives the user input command through the Graphical User Interface (GUI). Alternatively, the user may input a user command by inputting a specific sound or gesture, and the user input interface 260-3 receives the user input command by recognizing the sound or gesture through the sensor.
The video processor 260-1 is configured to receive a video signal, and perform video data 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 video signal that is directly displayed or played on the first display screen 280.
Illustratively, the video processor 260-1 includes a demultiplexing module, a video decoding module, an image synthesizing module, a frame rate conversion module, a display formatting module, and the like (not shown in the figure).
The demultiplexing module is used for demultiplexing the input audio and video data stream, and if the input MPEG-2 is input, the demultiplexing module demultiplexes the input audio and video data stream into a video signal and an audio signal.
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, such as an image synthesizer, is used for performing superposition mixing processing on the GUI signal input by the user or generated by the user and the video picture after the zooming processing by the graphics generator so as to generate an image signal for display.
The frame rate conversion module is configured to convert a frame rate of an input video, such as a 24Hz, 25Hz, 30Hz, or 60Hz video, into a 60Hz, 120Hz, or 240Hz frame rate, where the input frame rate may be related to a source video stream, and the output frame rate may be related to a refresh rate of the display device. And a display formatting module for converting the signal output by the frame rate conversion module into a signal conforming to a display format of the display device, such as converting the format of the signal output by the frame rate conversion module to output RGB data signals.
A display screen 280 for receiving the image signal from the input of the video processor 260-1. It will be appreciated that in one particular implementation of FIG. 7, in addition to the display screen 280, it is provided within the host of the display device; alternatively, in other possible implementations, an audio playing device such as a speaker may be further disposed in the display screen 280, which is not limited in this application. The display screen 280 for displaying video content and images and menu manipulation interface includes a display screen component for presenting pictures and a driving component for driving the display of images. The video content may be displayed from the video in the broadcast signal received by the tuner/demodulator 220, or from the video content input from the communicator or the external device interface. The screen 280 is displayed while a user manipulation interface UI generated in the display apparatus 200 and used to control the display apparatus 200 is displayed.
And, a driving component for driving the display according to the type of the display screen 280. Alternatively, a projection device and projection screen may be included, provided that display screen 280 is a projection display screen.
The audio processor 260-2 is configured to receive an audio signal, and perform decompression and decoding according to a standard codec protocol of the input signal, and perform audio data processing such as noise reduction, digital-to-analog conversion, and amplification processing to obtain an audio signal that can be played in the speaker 272.
An audio output interface 270 for receiving the audio signal output by the audio processor 260-2 under the control of the first controller 210, wherein the audio output interface may include a speaker 272 or an external sound output terminal 274 for outputting to a generating device of an external device, such as: external sound terminal or earphone output terminal.
In other exemplary embodiments, video processor 260-1 may comprise one or more chip components. The audio processor 260-2 may also include one or more chips.
And, in some other exemplary embodiments, the video processor 260-1 and the audio processor 260-2 may be separate chips or may be integrated in one or more chips together with the first controller 210.
The power supply module 240 is configured to provide power supply support for the display apparatus 200 with power input from an external power source under the control of the first controller 210. The power supply module 240 may include a built-in power supply circuit installed inside the display apparatus 200, or may be a power supply installed outside the display apparatus 200, such as a power supply interface for providing an external power supply in the display apparatus 200.
The detector 340 is a component of the display device a chip for collecting signals of an external environment or interacting with the outside. The detector 340 may include a light receiver 342, a sensor for collecting the intensity of ambient light, which may be used to adapt to display parameter changes, etc.; the system may further include an image collector 341, such as a camera, a video camera, etc., which may be configured to collect external environment scenes, collect attributes of the user or interact gestures with the user, adaptively change display parameters, and identify user gestures, so as to implement a function of interaction with the user.
An external device interface 350, which provides a component for data transmission between the second controller 310 and the N-chip or other external devices. The external device interface may be connected with an external apparatus such as a set-top box, a game device, a notebook computer, etc. in a wired/wireless manner.
A video processor 360 for processing the associated video signal.
It will be appreciated by those skilled in the art that the arrangements shown in the figures are not intended to be limiting of the display device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.
Fig. 7 is a diagram schematically illustrating a functional configuration of a display device according to an exemplary embodiment. As shown in fig. 7, the memory 290 is specifically used for storing an operating program for driving the first controller 210 in the display apparatus 200, and storing various applications built in the display apparatus 280, various applications downloaded by a user from an external device, various graphical user interfaces related to the applications, various objects related to the graphical user interfaces, user data information, and internal data of various supported applications. The memory 290 is used to store system software such as an Operating System (OS) kernel, middleware, and applications, and to store input video data and audio data, and other user data.
The memory 290 is specifically used for storing drivers and related data such as the video processor 260-1 and the audio processor 260-2, the first display screen 280, the communicator 230, the tuner demodulator 220, the input/output interface, and the like.
In some embodiments, memory 290 may store software and/or programs, software programs for representing an Operating System (OS) including, for example: a kernel, middleware, an Application Programming Interface (API), and/or an application program. For example, the kernel may control or manage system resources, or functions implemented by other programs (e.g., the middleware, APIs, or applications), and the kernel may provide interfaces to allow the middleware and APIs, or applications, to access the controller to implement controlling or managing system resources.
The memory 290, for example, includes a broadcast receiving module 2901, a channel control module 2902, a volume control module 2903, an image control module 2904, a display control module 2905, a first audio control module 2906, an external instruction recognition module 2907, a communication control module 2908, a light receiving module 2909, a power control module 2910, an operating system 2911, and other applications 2912, a browser module 2913, and so forth. The first controller 210 performs operations such as: the system comprises a broadcast television signal receiving and demodulating function, a television channel selection control function, a volume selection control function, an image control function, a display control function, an audio control function, an external instruction identification function, a communication control function, an optical signal receiving function, an electric power control function, a software control platform supporting various functions, a browser function and other various functions.
The memory 390 includes a memory storing various software modules for driving and controlling the display apparatus 200. Such as: various software modules stored in memory 390, including: a base module, a detection module, a communication module, a display control module, a browser module, and various service modules, etc. (not shown in the figure). Since the functions of the memory 390 and the memory 290 are similar, reference may be made to the memory 290 for relevant points, and thus, detailed description thereof is omitted here.
Illustratively, the memory 390 includes an image control module 3904, a second audio control module 3906, an external instruction recognition module 3907, a communication control module 3908, a light receiving module 3909, an operating system 3911, and other application programs 3912, a browser module 3913, and the like. The first controller 210 performs operations such as: the system comprises an image control function, a display control function, an audio control function, an external instruction identification function, a communication control function, an optical signal receiving function, an electric power control function, a software control platform supporting various functions, a browser function and other various functions.
Illustratively, since the image receiving device such as a camera is connected with the controller, the external instruction recognition module 3907 of the controller may include the pattern recognition module 2907-1, a pattern database is stored in the pattern recognition module 3907-1, and when the camera receives an external pattern instruction, the camera corresponds to the pattern instruction in the pattern database to perform instruction control on the display device. Since the voice receiving device and the remote controller are connected to the controller, the external command recognition module 2907 of the controller may include a voice recognition module 2907-2, a voice database is stored in the voice recognition module 2907-2, and when the voice receiving device receives an external voice command or the like, the voice receiving device corresponds to the command in the voice database to perform command control on the display device. Similarly, a control device 100 such as a remote controller is connected to the controller, and the button command recognition module 2907-3 performs command interaction with the control device 100.
The following describes a specific implementation of the display device provided in the present application with reference to the accompanying drawings.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application.
The display device of the present application includes a display screen 201 and a host 202 as shown in fig. 1, and the host 202 is connected to the display screen 201 through a connection line 203. The host 202 includes a power board, a motherboard, a sound box, and the like. The power panel is connected with the main board and the sound box to provide electric energy for the main board and the sound box, and the power panel also provides electric energy for the display screen 201 through the connecting wire 203.
As shown in fig. 8, the power panel 700 is provided with an AC-DC circuit for converting AC power provided by the power supply device into DC power for the load. Illustratively, the AC-DC circuit may include: a rectifying circuit 701, a voltage conversion circuit 702, a switch controller 703, and an AC-DC feedback circuit 704. The rectifying circuit 701 is configured to rectify an alternating current provided by a power supply device, and perform voltage conversion on a voltage subjected to the rectification processing by using a voltage converting circuit to obtain a direct current DC, that is, a voltage required to provide power to a load, and at the same time, there is a high-voltage output, that is, a first voltage, and the AC-DC feedback circuit 704 samples the first voltage and adjusts the switching performance of the switching controller 703, thereby achieving the purpose of stabilizing the direct current DC.
It should be understood that the voltage conversion circuit 702 may be a transformer, or a circuit provided with a transformer. The load may be at least one of a motherboard, a sound, a display driver board, a display screen, and the like.
Fig. 9 is a schematic structural diagram of an AC-DC feedback circuit according to an embodiment of the present application. Based on the above description of the embodiments, it should be understood that the AC-DC feedback circuit plays a very important role in whether the entire AC-DC circuit can output a stable direct current voltage. The AC-DC feedback circuit is usually designed as shown in fig. 9, and components including the reference source device TL (e.g. TL431) in fig. 9 need to operate within their respective safe voltage ranges, so that a lower second voltage needs to be obtained by dropping the first voltage to avoid damage to the components. For example, in the first mode, the voltage source S is directly introduced to provide a lower voltage to implement voltage drop, for example, a 12V/18V voltage source, but in the first mode, during the startup or shutdown process, an overshoot problem may be caused due to a timing difference between the output of the first voltage and the output of the voltage source S, resulting in damage to components; for another example, in the second mode, voltage drop is realized by connecting a plurality of voltage-regulator tubes in series, however, when the first voltage is very high, a large number of voltage-regulator tubes need to be arranged, on one hand, the cost is increased, and the size of the circuit is increased, and on the other hand, after the output voltage is lower than the value of the voltage-regulator tubes, the AC-DC feedback circuit cannot normally operate, so that the range of the first voltage which can be adapted by the AC-DC feedback circuit is very narrow.
Based on the embodiment shown in fig. 9, in order to effectively adjust the stability of the direct current output by the AC-DC circuit and solve the technical problem in the embodiment shown in fig. 9, an embodiment of the present application provides an AC-DC feedback circuit, which has enhanced adaptability to a first voltage, can adapt to a wide range of first voltages, can implement effective voltage drop, and avoids the damage of each component in the AC-DC feedback circuit.
Fig. 10 is a schematic structural diagram of an AC-DC feedback circuit according to another embodiment of the present application. As shown in fig. 10, the AC-DC feedback circuit 704 includes: the voltage stabilizing circuit 7042 and the optical coupling circuit 7041, the voltage stabilizing circuit 7042 is configured to control the voltage of the AC-DC feedback circuit 7041 to be in a safe voltage range, that is, to step down and stabilize the first voltage output by the voltage conversion circuit 702, and the optical coupling circuit 7041 is configured to output a feedback signal to the switch controller 703, so that the switch controller 703 outputs a stable pulse signal to the voltage conversion circuit according to the feedback signal, thereby achieving a purpose of stabilizing the direct current output by the voltage conversion circuit.
Fig. 11 is a schematic structural diagram of an AC-DC feedback circuit according to another embodiment of the present application. Based on the embodiment shown in fig. 10, the voltage stabilizing circuit 7042 includes the regulator circuit 421 and the voltage reference circuit 422 shown in fig. 10. The voltage reference circuit 422 is connected between the voltage regulator circuit 421 and the optical coupling circuit 7041, the optical coupling circuit 7041 is connected to the voltage regulator circuit 421, and the voltage regulator circuit 421 and the voltage reference circuit 422 are further connected to the output terminal of the voltage conversion circuit 702 respectively.
The regulator circuit 421 is used to reduce the first voltage output by the voltage converting circuit 720 to a second voltage, which is understood to be a safe voltage specified by a reference source device TL in the voltage reference circuit 422, the reference source device TL being an element for providing a reference voltage, such as TL 431.
Further, the voltage reference circuit 422 is used for performing voltage regulation according to the second voltage and a preset reference voltage, so that the voltage of the AC-DC feedback circuit is stabilized. Taking TL431 as an example, the reference voltage of TL431 is 2.5V, if the second voltage is lower than 2.5V, TL431 controls voltage reference circuit 422 to increase the second voltage, and if the second voltage is higher than 2.5V, TL431 controls voltage reference circuit 422 to decrease the second voltage, so that the voltage of the AC-DC feedback circuit is in a safe voltage range.
Fig. 12 is a schematic structural diagram of an AC-DC feedback circuit according to another embodiment of the present application.
On the basis of the above embodiments, in order to make the AC-DC feedback circuit enhance the adaptability to the first voltage, so that it can adapt to a wide range of first voltages, in the embodiment of the present application, the regulator circuit 421 shown in fig. 12 includes: the voltage-dividing resistor, the field effect transistor V1, the bias resistor R3, the filter capacitor C1 and the voltage-stabilizing tube VZ 1.
One end of the voltage dividing resistor is connected to the output end of the voltage conversion circuit 702, and the other end of the voltage dividing resistor is connected to one end of the bias resistor R3 and the drain d of the field effect transistor V1. An exemplary Field Effect Transistor may be a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), or the Field Effect Transistor may be replaced with a triode.
Illustratively, the voltage dividing resistor includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are connected in series, the first voltage dividing resistor R1 is further connected to the output terminal of the voltage converting circuit 702, and the second voltage dividing resistor R2 is connected in series between the first voltage dividing resistor R1 and the field effect transistor V1. When current flows through fet V1, a voltage drop is generated across first and second divider resistors R1 and R2, thereby sharing the stress of fet V1.
The grid g of the field effect transistor V1 is connected with the other end of the bias resistor R3 and then connected with the negative electrode of the voltage regulator tube VZ 1. It should be appreciated that the bias resistor R3 provides bias current to the zener VZ 1.
Further, the source s of the field effect transistor V1 is connected to one end of the filter capacitor C1, and the filter capacitor C1 is connected to the anode of the regulator VZ1 and then grounded. Wherein the filter capacitor C1 functions as a prayer energy storage filter in the AC-DC feedback circuit.
As shown in connection with fig. 12, for example, the voltage reference circuit 422 includes: the reference source device TL, a first resistor R4, a second resistor R5, a third resistor R6, a fourth resistor R7 and a first capacitor C2.
The first resistor R4, the second resistor R5, and the third resistor R6 are sequentially connected in series, one end of the first resistor R4 is connected to the output terminal of the voltage converting circuit 702, and one end of the third resistor R6 is connected to the anode a of the reference source device TL.
One end of the fourth resistor R7 is connected between the second resistor R5 and the third resistor R6, the other end of the fourth resistor is connected in series with the first capacitor C2, and the first capacitor C2 is further connected to the cathode k of the reference source device TL. The reference electrode R of the reference source device TL is connected between the second resistor R5 and the third resistor R6, and the anode a of the reference source device TL is grounded.
As shown in connection with fig. 12, the optocoupler circuit 7041 illustratively includes an optocoupler OC and a voltage divider circuit.
The optical coupler OC is an electric-optical-electric conversion device that transmits an electric signal using light as a medium. It is composed of two parts of luminous source and light receiver. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light source is an input end, the pin of the light receiver is an output end, the common light source is a light emitting diode, and the light receiver is a photosensitive diode, a phototriode and the like. The pin of the light emitting source is connected with the voltage dividing circuit, and the pin of the light receiver is connected with the feedback pin FB of the switch controller.
The voltage divider circuit comprises a fifth resistor R8 and a sixth resistor R9. One end of the fifth resistor R8 is connected between the fet V1 and the filter capacitor C1 of the voltage regulator circuit, as shown in fig. 12, one end of the fifth resistor R8 is connected to the vout _ VCC node, and the vout _ VCC node is between the fet V1 and the filter capacitor C1. The other end of the fifth resistor R8 is connected to a first lead (e.g., the anode of the light emitting diode) of the light emitting source, and two ends of the sixth resistor are respectively connected to the first lead (e.g., the anode of the light emitting diode) and a second lead (e.g., the cathode of the light emitting diode) of the light emitting source.
Illustratively, a first pin c of a light receiver of the photo coupler OC is connected to a feedback pin FB of the switch controller 703, and a second pin e of the light receiver is grounded.
In this embodiment, the voltage of vout _ VCC is determined by the voltage regulator VZ1, so long as the voltage of ZV1 is within the safe voltage of the reference source device TL, such as TL431, the safety of the components including TL431 in the AC-DC feedback circuit can be ensured, and at the same time, a high-voltage MOSFET or a triode and a voltage regulator are arranged at the high-voltage output end of the voltage conversion circuit 720 to perform main voltage absorption on the first voltage, so that the high-voltage output of the voltage conversion circuit 720 with a wide voltage range can be supported.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A display device, comprising:
a host and a display screen; the host is connected with the display screen through a connecting wire;
the host comprises a power panel for providing electric energy to the display screen through the connecting line;
and the power panel is provided with an AC-DC feedback circuit for converting AC into DC, and is used for controlling the power panel to output stable DC.
2. The apparatus of claim 1, wherein the AC-DC feedback circuit comprises: an optical coupling circuit and a voltage stabilizing circuit;
the voltage stabilizing circuit is connected with the optical coupling circuit;
the voltage stabilizing circuit is used for controlling the voltage of the AC-DC feedback circuit to be in a safe voltage range;
the optical coupling circuit is used for outputting a feedback signal to a switch controller on the power panel, so that the switch controller outputs a stable pulse signal to the voltage conversion circuit according to the feedback signal.
3. The apparatus of claim 2, wherein the voltage regulator circuit comprises:
a voltage regulator circuit and a voltage reference circuit;
the voltage reference circuit is connected between the voltage stabilizing power supply circuit and the optical coupling circuit;
the voltage stabilizing power supply circuit and the voltage reference circuit are also respectively connected with the output end of the voltage conversion circuit on the power panel;
the voltage stabilizing source circuit is used for reducing the first voltage output by the voltage conversion circuit into a second voltage; the second voltage is a safe voltage specified by a reference source device in the voltage reference circuit, and the reference source device is an element for providing a reference voltage;
the voltage reference circuit is used for carrying out voltage regulation according to the second voltage and a preset reference voltage so as to stabilize the voltage of the AC-DC feedback circuit.
4. The apparatus of claim 3, wherein the regulated supply circuit comprises:
the voltage-stabilizing circuit comprises a divider resistor, a field effect transistor, a bias resistor, a filter capacitor and a voltage-stabilizing tube;
one end of the voltage dividing resistor is connected with the output end of the voltage conversion circuit, and the other end of the voltage dividing resistor is respectively connected with one end of the bias resistor and the drain electrode of the field effect transistor;
the grid electrode of the field effect transistor is connected with the other end of the bias resistor and then connected with the negative electrode of the voltage stabilizing tube;
and the source electrode of the field effect transistor is connected with one end of the filter capacitor, and the filter capacitor is grounded after being connected with the anode of the voltage stabilizing tube.
5. The apparatus of claim 4, wherein the voltage dividing resistor comprises a first voltage dividing resistor and a second voltage dividing resistor;
the first voltage-dividing resistor is connected in series with the second voltage-dividing resistor.
6. The apparatus of claim 3, wherein the voltage reference circuit comprises:
the circuit comprises a reference source device, a first resistor, a second resistor, a third resistor, a fourth resistor and a first capacitor;
the first resistor, the second resistor and the third resistor are sequentially connected in series, one end of the first resistor is connected with the output end of the voltage conversion circuit, and one end of the third resistor is connected with the anode of the reference source device;
one end of the fourth resistor is connected between the second resistor and the third resistor; the other end of the fourth resistor is connected with the cathode of the reference source device after being connected with the first capacitor;
and the reference electrode of the reference source device is connected between the second resistor and the third resistor, and the anode of the reference source device is grounded.
7. The apparatus of claim 2, wherein the optocoupler circuit comprises:
an optical coupler and a voltage divider circuit;
the optical coupler is connected with the voltage division circuit;
the voltage division circuit is used for reducing the voltage of the light emitting source end of the optical coupler;
the optical coupler is used for sending a feedback signal to the switch controller.
8. The apparatus of claim 7, wherein the optical coupler comprises:
a light emitting source and a light receiving device;
and the pin of the luminous source is connected with the voltage division circuit, and the pin of the light receiver is connected with the feedback pin of the switch controller.
9. The apparatus of claim 8, wherein the voltage divider circuit comprises:
a fifth resistor and a sixth resistor;
one end of the fifth resistor is connected between the field effect transistor and the filter capacitor in the voltage stabilizing circuit, and the other end of the fifth resistor is connected with the first pin of the luminous source;
and two ends of the sixth resistor are respectively connected with the first pin and the second pin of the light-emitting source.
10. The apparatus of claim 7, wherein a first pin of the light receptor is connected to a feedback pin of the switch controller, and a second pin of the light receptor is connected to ground.
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