WO2019015090A1 - 一种显示装置的信号传输电路及显示装置 - Google Patents

一种显示装置的信号传输电路及显示装置 Download PDF

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Publication number
WO2019015090A1
WO2019015090A1 PCT/CN2017/103244 CN2017103244W WO2019015090A1 WO 2019015090 A1 WO2019015090 A1 WO 2019015090A1 CN 2017103244 W CN2017103244 W CN 2017103244W WO 2019015090 A1 WO2019015090 A1 WO 2019015090A1
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Prior art keywords
signal
video
screen
output
video signal
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French (fr)
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刘伟
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shirui Electronics Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shirui Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus

Definitions

  • the utility model relates to the technical field of display, in particular to a signal transmission circuit and a display device of a display device.
  • liquid crystal interactive panels are provided with a video signal output interface for outputting video signals to other display devices, so that the flat panel and the display device connected to the video signal output interface simultaneously display video images.
  • the principle is realized that the video signal output from the main chip to the screen is also output to the video signal output interface.
  • LCD interactive tablet technology is increasingly mature, can connect external signal sources such as set-top boxes, computers and mobile phones and display video signals provided by external signal sources. It can also add signal sources such as PC modules or Android modules inside the tablet to provide multiple LCD interactive tablets. Operating system and user interface. These sources will transmit video signals to the main chip of the LCD interactive tablet, and the main chip of the LCD interactive tablet will also generate a video signal, that is, the video image of the main operating system it runs. The user can select whether the picture displayed on the current tablet is a video image of an operating system running on the main chip or a video image provided by another source.
  • the prior art outputs the video signal outputted by the main chip to the screen to the video signal output interface, so that the external display device can only display the video image in synchronization with the liquid crystal flat panel display.
  • the freedom to choose video images limits the variety of multi-screen interactions.
  • the embodiment of the present invention provides a signal transmission circuit and a display device of a display device, so that the video signal outputted by the video output interface can be selected, so that the display device and other display devices connected to the video signal output interface can display differently.
  • Video images enrich the diversity of multi-screen interactions.
  • an embodiment of the present invention provides a signal transmission circuit of a display device, including a main chip, a signal switcher, and a video signal output interface;
  • the main chip includes a screen signal output end, a switching command output end and at least one peripheral signal input end;
  • the signal switcher includes an instruction receiving end, a screen signal receiving end, a transmitting end and at least one peripheral signal receiving end;
  • the peripheral signal input end of the main chip is configured to receive a video signal output by a signal source, and the main chip is configured to output a video signal to a screen signal output end of the screen of the display device and connect the screen signal receiving of the signal switcher End, the instruction output end of the main chip for outputting a channel switching instruction is connected to an instruction receiving end of the signal switcher;
  • the peripheral signal receiving end of the signal switcher is configured to receive a video signal output by the signal source; the signal switch is configured to output a video signal corresponding to the channel switching instruction to be connected to the video signal output interface;
  • the video signal output interface is used to connect other display devices to output a video signal.
  • an embodiment of the present invention provides a display device including a screen driving board, a screen, and a signal transmission circuit of the above display device;
  • the screen driving board includes a video input end and a video output end;
  • the screen signal output end of the main chip is connected to the video input end of the screen drive board, and the video output end of the screen drive board is connected to the screen.
  • the embodiment of the present invention adds a signal switcher to the display device, and the signal switcher receives
  • the signal of the external signal source also receives the signal output from the main chip to the screen, selects the corresponding channel according to the channel switching instruction provided by the main chip, and outputs the corresponding video signal, thereby solving the signal outputted by the prior art video signal output interface and the signal of the screen.
  • the video image must be synchronized and cannot be freely selected.
  • the video signal output from the video output interface can be selected.
  • the display device and other display devices connected to the video signal output interface can display different video images, which enriches the video image. The effect of the diversity of the screen interaction.
  • FIG. 1 is a schematic structural diagram of a signal transmission circuit of a display device according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a signal transmission circuit of a display device according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic structural view of a display device according to Embodiment 3 of the present invention.
  • the signal transmission circuit 10 includes a main chip 11, a signal switcher 12, and a video signal output interface 13; wherein, the main chip 11 includes a screen signal output terminal, a switching command output terminal, and at least one peripheral signal input terminal; the signal switcher 12 includes Screen signal receiving end, command receiving end, transmitting end and at least one peripheral signal connection Figure 1 shows three signal sources, namely signal source 141, signal source 142 and signal source 143, the main chip 11 is correspondingly provided with three peripheral signal input terminals, and the signal switcher 12 is correspondingly provided with three Peripheral signal receiver.
  • the peripheral signal input end of the main chip 11 is used for receiving a video signal output by a signal source, that is, a video signal outputted from a signal source connected to the signal transmission circuit 10 is transmitted to a peripheral signal input corresponding to the main chip 11. end;
  • the screen signal output end of the main chip 11 for outputting the video signal to the screen of the display device is connected to the screen signal receiving end of the signal switcher 12, that is, the video signal output by the main chip 11 to the screen of the display device (input by the display device)
  • the device selection may be a signal output from the signal source to the main chip, or may be a signal of the main chip's own operating system) transmitted to the signal switcher 12; the peripheral signal receiving end of the signal switcher 12 is also used to receive the signal source output.
  • the video signal that is, the video signal output from the signal source connected to the signal transmission circuit 10 is also transmitted to the signal switcher 12; the command output terminal of the main chip 11 for outputting the channel switching command CTL_Switch is connected to the command receiving end of the signal switcher 12.
  • the signal switcher 12 receives the video signal of the screen of the display device and the video signal output by the signal source, and also receives the channel switching instruction CTL_Switch, which can output the video signal corresponding to the channel switching instruction CTL_Switch, that is, The channel switching command CTL_Switch selects a video signal that is output in accordance with the screen of the display device, or outputs a signal output from any of the signal sources.
  • the channel switching instruction CTL_Switch may be generated according to an operation of the user on an input device (such as a keyboard, a touch screen, etc.) of the display device.
  • the main chip can also be set to automatically generate a channel switching instruction CTL_Switch according to its working mode.
  • the signal switcher 12 is configured to output a video signal corresponding to the channel switching instruction to be connected to the video signal output interface 13; the video signal output interface 13 is configured to connect to other display devices, and output the view Frequency signal.
  • the signal source needs to separately transmit the video signal to the peripheral signal input end of the main chip 11 and the peripheral signal receiving end of the signal switcher 12, that is, the video signal is divided into two video signal outputs. It generally needs to be implemented by a video signal distributor.
  • the signal transmission circuit 10 further includes at least one video signal distributor, each video signal distributor including one input terminal and two output terminals, that is, the video signal distributor is an input and output video signal distributor.
  • the input end of the video signal distributor is used to connect the signal source; one output end of the video signal distributor is connected to the peripheral signal input end corresponding to the main chip 11, and the peripheral signal input end of the main chip 11 receives the video outputted by the signal source.
  • the other output end of the video signal distributor is connected to the corresponding peripheral signal receiving end of the signal switcher 12, so that the peripheral signal receiving end of the signal switcher 12 receives the video signal output by the signal source.
  • the technical solution of the embodiment adds a signal switcher to the display device, and the signal switcher receives the signal of the external signal source, and also receives the signal output by the main chip to the screen, and selects according to the channel switching instruction provided by the main chip.
  • the channel outputs the corresponding video signal, which solves the problem that the signal outputted by the prior art video signal output interface and the screen signal must be synchronized, and the video image cannot be freely selected, and the video signal output by the video output interface is optional.
  • the device and other display devices connected to the video signal output interface can display different video images, enriching the diversity of multi-screen interaction.
  • Embodiment 2 is a signal transmission circuit of a display device according to Embodiment 2 of the present invention. Based on the first embodiment, the present embodiment provides a signal transmission suitable for the mainstream liquid crystal interactive tablet currently on the market. Transmission circuit.
  • the video signal output interface of the LCD interactive tablet generally adopts an HDMI output interface.
  • the signal transmission circuit 20 includes a main chip 21, a signal switcher 22, an HDMI output interface 23, an HDMI input interface 243, a VGA input interface 244, and at least one video signal distributor 25.
  • the signal switcher 22 is an HDMI signal switcher.
  • the signal transmission circuit can connect up to four signal sources at the same time.
  • the four signal sources are PC module 241, Android module 242, and HDMI input, respectively.
  • the HDMI input interface 243 and the VGA input interface 244 are video input interfaces, and are interfaces for connecting external terminals and receiving video signals transmitted by external terminals, such as terminals connected to a computer, a mobile phone, or a set top box.
  • the PC module 241 and the Android module 242 are modules that can output video signals by themselves, and can be fixedly connected to the signal transmission circuit, or can be plugged and mounted on the display device, and they can provide a separate operating system, when the PC module 241 or The signal of the Android module 242 is transmitted to the main chip 21.
  • the input device of the liquid crystal interactive tablet can select which channel the video image displayed on the current liquid crystal interactive tablet is, that is, the operating system interface provided by the PC module or the Android module, or the main chip itself.
  • the PC module 241 and the Android module 242 provide multi-system operation for the liquid crystal panel.
  • the input end of the video signal distributor 25 is used for connecting the signal source, and the video signal outputted by the video signal is divided into two video signal outputs, and is sent to the peripheral signal input end of the main chip 21, and is sent to the signal switcher 22 all the way.
  • an input end of one of the video signal distributors 25 is connected to an external terminal (signal source) through the HDMI input interface 243, that is, the HDMI input interface 243 is connected to the input end of the video signal distributor 25 and Between the external terminals; the input of the other video signal distributor 25 is connected to the external terminal (signal source) through the VGA input interface 244, ie A VGA input interface 244 is coupled between the input of the video signal distributor 25 and an external terminal.
  • the signal transmission circuit further includes a VGA to HDMI chip 26, and the VGA to HDMI chip 26 is connected between the VGA input interface 244 and the input of the video signal distributor 25, so that the output provided by the VGA input interface 244 is output to the main chip 21 and the signal is switched.
  • the video signal of the device 23 is converted into an HDMI signal, and the video signals output from the four signal sources to the main chip 21 and the signal switch 23 are all HDMI signals.
  • the signal transmission circuit further includes a VBO to HDMI chip or an LVDS to HDMI chip 27.
  • the VBO to HDMI chip or the LVDS to HDMI chip 27 is connected between the screen signal output terminal of the main chip 21 and the screen signal receiving end of the signal switcher 22. Since the video signal output by the main chip is generally a VBO signal or an LVDS signal, a VBO to HDMI chip or an LVDS to HDMI chip 27 is required for format conversion to output an HDMI signal.
  • the signal switcher 22 receives the video signal of each channel, and receives the channel switching instruction CTL_Switch of the main chip 21, and outputs the video signal corresponding to the channel switching instruction CTL_Switch to the video signal output interface, that is, the HDMI output.
  • Interface 23 The other display device that connects the HDMI output interface 23 can always display the video signal displayed on the screen of the liquid crystal interactive tablet, regardless of which channel of the video signal is displayed on the screen, and follow the display; or can not follow the video signal displayed on the screen. Displays the video signal provided by any of the specified sources. Enrich the diversity of multi-screen interactions.
  • the working principle of the signal transmission circuit 20 is illustrated by taking four different types of signal sources as an example, but in a specific implementation, the signal source connected to the signal transmission circuit 20 may be one or more of them, and It may not be all, and may be other signal sources than the four signal sources, which are specifically set by those skilled in the art according to the functional requirements of the display device.
  • the technical solution of the embodiment adds a signal switcher to the display device, and the signal is cut.
  • the converter receives the signal of the external signal source, and also receives the signal outputted by the main chip to the screen, selects the corresponding channel according to the channel switching instruction provided by the main chip, and outputs the corresponding video signal, thereby solving the signal outputted by the prior art video signal output interface.
  • the signal of the screen must be synchronous and consistent, and the problem of the video image cannot be freely selected.
  • the video signal output by the video output interface can be selected.
  • the display device and other display devices connected to the video signal output interface can display different video images, which are rich. The effect of the diversity of multi-screen interactions.
  • the display device includes a screen driving board 32, a screen 33, and a signal transmission circuit 31.
  • the signal transmission circuit 31 is a signal transmission circuit provided in Embodiment 1 or Embodiment 2.
  • the screen signal output end of the main chip in the signal transmission circuit 31 is connected to the video input end of the screen drive board 32.
  • the video output end of the screen drive board 32 is connected to the screen 33, and the video signal is output to the screen 33 for display.
  • the VBO/LVDS to HDMI chip also functions as a signal distributor, dividing the VBO/LVDS outputted by the main chip into two signals, and converting all the way to HDMI signal transmission to The signal switcher, the other path is a VBO/LVDS signal, which is transmitted to the screen drive board 32 to realize the connection between the main chip and the screen drive board 32.
  • the display device is a liquid crystal interactive tablet
  • the screen driving board is a TCON board.
  • the display device provided in this embodiment includes the signal transmission circuit of the display device provided in the first embodiment or the second embodiment, and has corresponding beneficial effects.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

本实用新型公开一种显示装置的信号传输电路，包括主芯片、信号切换器和视频信号输出接口；主芯片的外设信号输入端接收信号源输出的视频信号，主芯片的屏信号输出端连接信号切换器的屏信号接收端，主芯片的指令输出端连接信号切换器的指令接收端；信号切换器的外设信号接收端接收信号源输出的视频信号；信号切换器的输送端连接视频信号输出接口；视频信号输出接口连接其它显示装置，输出视频信号。相应地，本实用新型还公开一种包括上述信号传输电路的显示装置，本实用新型实现视频输出接口输出的视频信号可选，使得本显示装置与连接到视频信号输出接口的其它显示装置可以显示不一样的视频图像，丰富了多屏互动的多样性。

Description

一种显示装置的信号传输电路及显示装置 技术领域
本实用新型涉及显示技术领域，尤其涉及一种显示装置的信号传输电路及显示装置。
背景技术
目前有些液晶交互平板设有视频信号输出接口，用于向其它显示装置输出视频信号，实现平板和连接到视频信号输出接口的显示装置同步显示视频图像。其实现的原理是，主芯片输出给屏幕的视频信号也输出至视频信号输出接口。
但现有技术的这种方案具有局限性。液晶交互平板技术日益成熟，可以连接机顶盒、计算机和手机等外部信号源并显示外部信号源提供的视频信号，也可在平板内部增设PC模块或Android模块等信号源，为液晶交互平板提供多个操作系统和用户界面。这些信号源会传输视频信号到液晶交互平板的主芯片，而液晶交互平板的主芯片也会生成一路视频信号，即其运行的主操作系统的视频图像。用户可选择当前平板显示的画面是主芯片运行的操作系统的视频图像还是其他信号源提供的视频图像。对于这种有多路视频信号的液晶交互平板，现有技术将主芯片输出给屏幕的视频信号也输出至视频信号输出接口，则使得外部显示装置只能与液晶平板显示同步一致的视频图像，不能自由地选择视频图像，限制了多屏互动的多样性。
实用新型内容
本实用新型实施例提供一种显示装置的信号传输电路及显示装置，以实现视频输出接口输出的视频信号可选，使得本显示装置与连接到视频信号输出接口的其它显示装置可以显示不一样的视频图像，丰富了多屏互动的多样性。
第一方面，本实用新型实施例提供了一种显示装置的信号传输电路，包括主芯片、信号切换器和视频信号输出接口；
所述主芯片包括屏信号输出端、切换指令输出端和至少一个外设信号输入端；所述信号切换器包括指令接收端、屏信号接收端、输送端和至少一个外设信号接收端；
所述主芯片的外设信号输入端用于接收信号源输出的视频信号，所述主芯片用于输出视频信号至本显示装置的屏幕的屏信号输出端连接所述信号切换器的屏信号接收端，所述主芯片用于输出通道切换指令的指令输出端连接所述信号切换器的指令接收端；
所述信号切换器的外设信号接收端用于接收信号源输出的视频信号；所述信号切换器用于输出所述通道切换指令对应的视频信号的输送端连接所述视频信号输出接口；
所述视频信号输出接口用于连接其它显示装置，输出视频信号。
第二方面，本实用新型实施例提供了一种显示装置，包括屏驱动板、屏幕和上述的显示装置的信号传输电路；所述屏驱动板包括视频输入端和视频输出端；
所述主芯片的屏信号输出端连接所述屏驱动板的视频输入端，所述屏驱动板的视频输出端连接所述屏幕。
本实用新型实施例通过在显示装置中增设信号切换器，该信号切换器接收 外部信号源的信号，也接收主芯片输出至屏幕的信号，根据主芯片提供的通道切换指令选择相应通道，输出对应的视频信号，解决了现有技术视频信号输出接口输出的信号跟屏幕的信号必须同步一致，不能自由地选择视频图像的问题；实现了视频输出接口输出的视频信号可选，本显示装置与连接到视频信号输出接口的其它显示装置可以显示不一样的视频图像，丰富了多屏互动的多样性的效果。
附图说明
图1是本实用新型实施例一提供的显示装置的信号传输电路的结构示意图；
图2是本实用新型实施例二提供的显示装置的信号传输电路的结构示意图；
图3是本实用新型实施例三提供的显示装置的结构示意图。
具体实施方式
下面结合附图和实施例对本实用新型作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本实用新型，而非对本实用新型的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本实用新型相关的部分而非全部结构。
实施例一
图1是本实用新型实施例一提供的显示装置的信号传输电路的结构示意图。该信号传输电路10包括主芯片11、信号切换器12和视频信号输出接口13；其中，主芯片11包括屏信号输出端、切换指令输出端和至少一个外设信号输入端；信号切换器12包括屏信号接收端、指令接收端、输送端和至少一个外设信号接 收端；图1示出了3个信号源，分别是信号源141、信号源142和信号源143，主芯片11对应设置有3个外设信号输入端，信号切换器12对应设置有3个外设信号接收端。
如图1所示，主芯片11的外设信号输入端用于接收信号源输出的视频信号，即连接到信号传输电路10的信号源输出的视频信号传输至主芯片11对应的外设信号输入端；
主芯片11用于输出视频信号至本显示装置的屏幕的屏信号输出端连接信号切换器12的屏信号接收端，即主芯片11输出至本显示装置的屏幕的视频信号(可由显示装置的输入设备选择，可能是信号源输出至主芯片的信号，也可能是主芯片自身操作系统的信号)传输至信号切换器12；信号切换器12的外设信号接收端也用于接收信号源输出的视频信号，即连接到信号传输电路10的信号源输出的视频信号也传输至信号切换器12；主芯片11用于输出通道切换指令CTL_Switch的指令输出端连接信号切换器12的指令接收端。通过上述连接关系，信号切换器12接收到了本显示装置的屏幕的视频信号和信号源输出的视频信号，还接收到了通道切换指令CTL_Switch，可输出与通道切换指令CTL_Switch对应的视频信号，即可以由通道切换指令CTL_Switch选择输出与本显示装置的屏幕一致的视频信号，或者输出任一信号源输出的信号。在具体实施时，通道切换指令CTL_Switch可根据用户在显示装置的输入设备(例如键盘、触摸屏等)上的操作生成。对于一些自适应能力强的显示装置，还可以设置主芯片根据其工作模式自动生成通道切换指令CTL_Switch。
信号切换器12用于输出所述通道切换指令对应的视频信号的输送端连接视频信号输出接口13；视频信号输出接口13用于连接其它显示装置，输出视 频信号。
需要说明的是，在具体实施时，信号源需要同时分别传输视频信号至主芯片11的外设信号输入端和信号切换器12的外设信号接收端，即将一路视频信号分成两路视频信号输出，一般需要通过视频信号分配器实现。
具体地，信号传输电路10还包括至少一个视频信号分配器，每一视频信号分配器包括一个输入端和两个输出端，即该视频信号分配器是一进二出视频信号分配器。视频信号分配器的输入端用于连接信号源；视频信号分配器的一个输出端连接主芯片11对应的外设信号输入端，实现主芯片11的外设信号输入端接收该信号源输出的视频信号；视频信号分配器的另一个输出端连接信号切换器12的对应的外设信号接收端，实现信号切换器12的外设信号接收端接收该信号源输出的视频信号。
综上，本实施例的技术方案通过在显示装置中增设信号切换器，该信号切换器接收外部信号源的信号，也接收主芯片输出至屏幕的信号，根据主芯片提供的通道切换指令选择相应通道，输出对应的视频信号，解决了现有技术视频信号输出接口输出的信号跟屏幕的信号必须同步一致，不能自由地选择视频图像的问题，实现视频输出接口输出的视频信号可选，本显示装置与连接到视频信号输出接口的其它显示装置可以显示不一样的视频图像，丰富了多屏互动的多样性的效果。
实施例二
图2是本实用新型实施例二提供的显示装置的信号传输电路。本实施例在实施例一的基础上，提供一种适用于目前市场上主流的液晶交互平板的信号传 输电路。液晶交互平板的视频信号输出接口一般采用HDMI输出接口。
具体地，本实施例中，信号传输电路20包括主芯片21、信号切换器22、HDMI输出接口23、HDMI输入接口243、VGA输入接口244以及至少一个视频信号分配器25。其中信号切换器22是HDMI信号切换器。
本实施例中，有四个视频信号分配器25，使得该信号传输电路最多可同时连接四个信号源，如图2所示，4个信号源分别是PC模块241、Android模块242、HDMI输入接口243所连接的外部终端和VGA输入接口244所连接的外部终端。其中HDMI输入接口243和VGA输入接口244属于视频输入接口，是用于连接外部终端，接收外部终端发送的视频信号的接口，如连接计算机、手机或机顶盒等终端。而PC模块241、Android模块242是可自行输出视频信号的模块，可固定连接于信号传输电路中，也可以可插拔安装在显示装置上，它们可以提供独立的操作系统，当PC模块241或Android模块242的信号传输至主芯片21，液晶交互平板的输入装置可选择当前液晶交互平板上显示的视频图像是哪个通道的，即是PC模块或Android模块提供的操作系统界面，还是主芯片自身的操作系统界面，或是视频输入接口所连接的终端设备的视频信号。PC模块241和Android模块242为液晶平板提供多系统操作。
视频信号分配器25的输入端用于连接信号源，将其输出的一路视频信号分成两路视频信号输出，一路送入主芯片21的外设信号输入端，一路送入信号切换器22的外设信号接收端。具体地，在本实施例中，其中一个视频信号分配器25的输入端通过HDMI输入接口243连接外部终端(信号源)，即HDMI输入接口243连接于所述视频信号分配器25的输入端与外部终端之间；另一个视频信号分配器25的输入端通过VGA输入接口244连接外部终端(信号源)，即 VGA输入接口244连接于所述视频信号分配器25的输入端与外部终端之间。信号传输电路还包括VGA转HDMI芯片26，VGA转HDMI芯片26连接于VGA输入接口244和视频信号分配器25的输入端之间，使得由VGA输入接口244提供的输出至主芯片21和信号切换器23的视频信号转换为HDMI信号，则四个信号源输出至主芯片21和信号切换器23的视频信号都是HDMI信号。
进一步地，信号传输电路还包括VBO转HDMI芯片或LVDS转HDMI芯片27。VBO转HDMI芯片或LVDS转HDMI芯片27连接于主芯片21的屏信号输出端与信号切换器22的屏信号接收端之间。由于主芯片输出的视频信号一般为VBO信号或LVDS信号，因此需要VBO转HDMI芯片或LVDS转HDMI芯片27进行格式转换以输出HDMI信号。
本实施例与实施例一相同，信号切换器22接收各通道的视频信号，并接收主芯片21的通道切换指令CTL_Switch，输出与通道切换指令CTL_Switch对应的视频信号到视频信号输出接口，即HDMI输出接口23。使得HDMI输出接口23连接的其它显示装置，可以始终显示本液晶交互平板的屏幕显示的视频信号，无论屏幕显示的是哪个通道的视频信号，都跟随显示；也可以不跟随屏幕显示的视频信号，显示任一指定的信号源提供的视频信号。丰富了多屏互动的多样性。
应当理解，本实施例以四个不同类型的信号源为例说明信号传输电路20的工作原理，但在具体实施时，信号传输电路20所连接的信号源可以是其中的一个或多个，并不一定是全部，还可以是这四个信号源之外的其他信号源，具体由本领域技术人员根据显示装置的功能需求设置。
综上，本实施例的技术方案通过在显示装置中增设信号切换器，该信号切 换器接收外部信号源的信号，也接收主芯片输出至屏幕的信号，根据主芯片提供的通道切换指令选择相应通道，输出对应的视频信号，解决了现有技术视频信号输出接口输出的信号跟屏幕的信号必须同步一致，不能自由地选择视频图像的问题，实现视频输出接口输出的视频信号可选，本显示装置与连接到视频信号输出接口的其它显示装置可以显示不一样的视频图像，丰富了多屏互动的多样性的效果。
实施例三
图3是本实用新型实施例三提供的显示装置的结构示意图。该显示装置包括屏驱动板32、屏幕33和信号传输电路31；该信号传输电路31是实施例一或实施例二提供的信号传输电路。信号传输电路31中主芯片的屏信号输出端连接屏驱动板32的视频输入端，屏驱动板32的视频输出端连接屏幕33，输出视频信号到屏幕33显示。若信号传输电路中包含VBO/LVDS转HDMI芯片，则VBO/LVDS转HDMI芯片还起到信号分配器的作用，将主芯片输出的VBO/LVDS分为两路信号，一路转为HDMI信号传输至信号切换器，另一路为VBO/LVDS信号，传输至屏驱动板32，实现主芯片和屏驱动板32的连接。优选地，该显示装置为液晶交互平板，屏驱动板为TCON板。
本实施例所提供的显示装置包括上述实施例一或二所提供的显示装置的信号传输电路，具备相应的有益效果。
需要说明的是，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
注意，上述仅为本实用新型的较佳实施例及所运用技术原理。本领域技术 人员会理解，本实用新型不限于这里的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本实用新型的保护范围。因此，虽然通过以上实施例对本实用新型进行了较为详细的说明，但是本实用新型不仅仅限于以上实施例，在不脱离本实用新型构思的情况下，还可以包括更多其他等效实施例，而本实用新型的范围由所附的权利要求范围决定。

Claims (9)

  1. 一种显示装置的信号传输电路，其特征在于，包括主芯片、信号切换器和视频信号输出接口；
    所述主芯片包括屏信号输出端、切换指令输出端和至少一个外设信号输入端；所述信号切换器包括屏信号接收端、指令接收端、输送端和至少一个外设信号接收端；
    所述主芯片的外设信号输入端接收信号源输出的视频信号，所述主芯片用于输出视频信号至本显示装置的屏幕的屏信号输出端连接所述信号切换器的屏信号接收端，所述主芯片用于输出通道切换指令的指令输出端连接所述信号切换器的指令接收端；
    所述信号切换器的外设信号接收端接收信号源输出的视频信号；所述信号切换器用于输出所述通道切换指令对应的视频信号的输送端连接所述视频信号输出接口；所述视频信号输出接口用于连接其它显示装置，输出视频信号。
  2. 如权利要求1所述的显示装置的信号传输电路，其特征在于，所述信号传输电路还包括至少一个视频信号分配器；每一所述视频信号分配器包括一个输入端和两个输出端；
    所述视频信号分配器的输入端用于连接信号源；所述视频信号分配器的一个输出端连接所述主芯片的对应的外设信号输入端，实现所述主芯片的外设信号输入端接收该信号源输出的视频信号；所述视频信号分配器的另一个输出端连接所述信号切换器的对应的外设信号接收端，实现所述信号切换器的外设信号接收端接收该信号源输出的视频信号。
  3. 如权利要求2所述的显示装置的信号传输电路，其特征在于，所述信号传输电路还包括HDMI输入接口，其中一个所述视频信号分配器的输入端通过 所述HDMI输入接口连接所述信号源；所述信号切换器为HDMI信号切换器；所述视频信号输出接口为HDMI输出接口。
  4. 如权利要求2所述的显示装置的信号传输电路，其特征在于，所述信号传输电路还包括VGA输入接口；其中一个所述视频信号分配器的输入端通过所述VGA输入接口连接所述信号源；所述信号切换器为HDMI信号切换器；所述视频信号输出接口为HDMI输出接口；
    所述信号传输电路还包括VGA转HDMI芯片；所述VGA转HDMI芯片连接于所述VGA输入接口和所述视频信号分配器的输入端之间。
  5. 如权利要求2所述的显示装置的信号传输电路，其特征在于，其中一个视频信号分配器的输入端连接的信号源为可插拔安装在所述显示装置上的PC模块或Android模块。
  6. 如权利要求3至5任一项所述的显示装置的信号传输电路，其特征在于，所述主芯片的屏信号输出端输出的信号为VBO视频信号；
    所述信号传输电路还包括VBO转HDMI芯片；所述VBO转HDMI芯片连接于所述主芯片的屏信号输出端与所述信号切换器的屏信号接收端之间。
  7. 如权利要求3至5任一项所述的显示装置的信号传输电路，其特征在于，所述主芯片的屏信号输出端输出的信号为LVDS视频信号；
    所述信号传输电路还包括LVDS转HDMI芯片；所述LVDS转HDMI芯片连接于所述主芯片屏信号输出端与所述信号切换器的屏信号接收端之间。
  8. 一种显示装置，其特征在于，包括屏驱动板、屏幕和如权利要求1至7任一项所述的显示装置的信号传输电路；所述屏驱动板包括视频输入端和视频输出端；
    所述主芯片的屏信号输出端连接所述屏驱动板的视频输入端，所述屏驱动板的视频输出端连接所述屏幕。
  9. 如权利要求8所述的显示装置，其特征在于，所述显示装置为液晶交互平板，所述屏驱动板为TCON板。
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