WO2018201333A1 - 一种数字电视系统 - Google Patents

一种数字电视系统 Download PDF

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Publication number
WO2018201333A1
WO2018201333A1 PCT/CN2017/082870 CN2017082870W WO2018201333A1 WO 2018201333 A1 WO2018201333 A1 WO 2018201333A1 CN 2017082870 W CN2017082870 W CN 2017082870W WO 2018201333 A1 WO2018201333 A1 WO 2018201333A1
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Prior art keywords
standby
video
main controller
digital television
module
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PCT/CN2017/082870
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English (en)
French (fr)
Inventor
丁雅娜
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深圳市智晟达科技有限公司
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Application filed by 深圳市智晟达科技有限公司 filed Critical 深圳市智晟达科技有限公司
Priority to PCT/CN2017/082870 priority Critical patent/WO2018201333A1/zh
Publication of WO2018201333A1 publication Critical patent/WO2018201333A1/zh

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Classifications

    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

Definitions

  • the invention belongs to the technical field of digital television, and in particular relates to a digital television system.
  • Digital TV not only improves the quality of the program, but also has the advantages of efficient transmission, high-quality picture sound, high-performance anti-interference reception; with the development and popularization of digital TV broadcasting technology, digital TV has gradually become a family information receiving unit, entertainment and The platform for consumption.
  • the embodiment of the invention provides a digital television system.
  • the digital television system of the invention has high equipment integration, simple design structure, low cost, and can provide online service for users in a standby state.
  • the embodiment of the present invention is implemented by a digital television system including a digital television terminal, a video source terminal connected to the digital television terminal, and a standby signal transmitting device connected to the digital television terminal; the digital television terminal
  • the main controller a video signal receiver, a standby signal receiver, a television control module, a display module, and a network module;
  • the video source terminal is connected to the input end of the main controller through the video signal receiving module;
  • a signal transmitting device is connected to the input of the main controller through a standby signal receiver; an output end of the main controller is connected to an input end of the television control module, and an output end of the television control module is respectively connected to the display module and
  • the internet module is connected.
  • the video signal receiver includes at least one HDMI interface device, and the video source terminal is connected to the main controller through a first HDMI interface device of the at least one HDMI interface device, the first HDMI interface The device is any one of the at least one HDMI interface device.
  • each of the at least one HDMI interface device is provided with an HDMI interface line
  • the video source terminal is provided with a first HDMI interface
  • the main controller is provided with a second HDMI interface.
  • the video signal receiver includes at least one DP interface device, and the video source terminal is connected to the main controller through a first DP connection device of the at least one DP interface device, the first DP interface
  • the device is any one of the at least one DP interface device.
  • each of the at least one DP interface device is provided with a DP interface line
  • the video source terminal is provided with a first DP interface
  • the main controller is provided with a second DP interface.
  • the standby signal receiving module is an infrared receiver.
  • the main controller comprises:
  • a signal extracting unit configured to extract a video carrier signal and a standby carrier signal for demodulation from a video signal transmitted by the video source terminal and a standby signal transmitted from the standby signal transmitter;
  • a demodulation unit configured to demodulate the extracted video carrier signal and the standby carrier signal to obtain a video baseband signal and a standby baseband signal;
  • a baseband signal conversion module configured to interleave a video baseband signal and a standby baseband signal, and output video conversion data and standby conversion data;
  • the baseband signal decoding unit is configured to decode the video conversion data and the standby conversion data output by the baseband signal conversion module to obtain corresponding video playback data and standby control commands.
  • the television control module includes: a DC voltage DCDC converter and a switch control unit; the main controller is connected to the DC voltage DCDC converter, and the DC voltage DCDC converter is respectively connected to the Internet module and The switch control unit is connected at one end, and the DC voltage DCDC converter controls to disconnect the power supply to the Internet module and the switch control unit according to the standby control command sent by the main controller. ;
  • the main controller is connected to one end of the switch control unit, and the other end of the switch control unit is connected to the display module, and the switch control unit controls to disconnect the power supply to the display module according to the standby control command sent by the main controller.
  • the switch control unit is a MOS tube.
  • the television control module further includes: a data transceiver unit; the main controller is connected to one end of the data transceiver unit, and the other end of the data transceiver unit is connected to the display module; The unit receives the video play data sent by the main controller, and transmits the video play data to the display module, and plays the display through the display module.
  • a data transceiver unit the main controller is connected to one end of the data transceiver unit, and the other end of the data transceiver unit is connected to the display module;
  • the unit receives the video play data sent by the main controller, and transmits the video play data to the display module, and plays the display through the display module.
  • the digital television system processes the video signal output by the video source terminal and the standby signal transmitted by the standby signal transmitting device by the main controller to obtain video playing data and standby control commands, and the video is controlled by the television control module.
  • the playback data is transmitted to the display module for play display, and the power supply to the display module and the internet module is disconnected according to the standby control command in the main controller, the device has high integration degree, simple design structure, low cost, and can be in standby state. Provide users with Internet access.
  • FIG. 1 is a schematic structural diagram of a digital television system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a main controller according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a television control module according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another television control module according to an embodiment of the present invention.
  • the digital television system processes the video signal output by the video source terminal and the standby signal transmitted by the standby signal transmitting device by the main controller to obtain video playing data and standby control commands, and the video is controlled by the television control module.
  • the playback data is transmitted to the display module for play display, and the power supply to the display module and the internet module is disconnected according to the standby control command in the main controller, the device has high integration degree, simple design structure, low cost, and can be in standby state. Provide users with Internet access.
  • a digital television system 10 includes a digital television terminal 100, a video source terminal 200 connected to the digital television terminal, and a standby signal transmission connected with the digital television terminal.
  • the digital television terminal 100 includes a main controller 110, a video signal receiver 120, a standby signal receiver 130, a television control module 140, a display module 150, and a network module 160.
  • the video source terminal 200 passes the video.
  • the signal receiving module 120 is connected to the input end of the main controller 110; the standby signal transmitting device 300 is connected to the input end of the main controller 110 through the standby signal receiver 130; the output end of the main controller 110
  • the TV control module 140 is connected to the input end, and the output of the TV control module 140 is respectively connected to the display module 150 and the Internet access module 160; the video signal output by the video source terminal and the standby signal transmitting device are transmitted by the main controller.
  • the standby signal is processed to obtain video playback data and standby control commands, and the video playback data is played through the television control module.
  • the display module is displayed for playing display, and the power supply of the display module and the internet module is disconnected according to the standby control command in the main controller.
  • the device has high integration degree, simple design structure, low cost, and can be used for the user in the standby state. Internet access is available.
  • the video signal receiver 130 includes at least one HDMI interface device, and the video source terminal is connected to the main controller through a first HDMI interface device of the at least one HDMI interface device,
  • the first HDMI interface device is any one of the at least one HDMI interface device.
  • Each of the at least one HDMI interface device is provided with an HDMI interface line
  • the video source terminal is provided with a first HDMI interface
  • the main controller is provided with a second HDMI interface.
  • the video signal receiver 130 includes at least one DP interface device, and the video source terminal is connected to the main controller through a first DP connection device of the at least one DP interface device.
  • the first DP interface device is any one of the at least one DP interface device.
  • Each of the at least one DP interface device is provided with a DP interface line, the video source terminal is provided with a first DP interface, and the main controller is provided with a second DP interface.
  • the standby signal receiving module 130 may be an infrared receiver, or may be a Bluetooth receiver or other wireless receiver.
  • the main controller 110 includes a signal extracting unit 111, a demodulating unit 112, a baseband signal converting unit 113, and a baseband signal decoding unit 114.
  • the signal extracting unit 111 is configured to extract a video carrier signal and a standby carrier signal for demodulation from a video signal transmitted by the video source terminal and a standby signal transmitted from the standby signal transmitter;
  • the demodulation unit 112 is configured to demodulate the extracted video carrier signal and the standby carrier signal to obtain a video baseband signal and a standby baseband signal.
  • the baseband signal conversion module 113 is configured to interleave the video baseband signal and the standby baseband signal. Transforming and outputting video conversion data and standby conversion data; the baseband signal decoding unit 114 is configured to decode the video conversion data and the standby conversion data output by the baseband signal conversion module to obtain corresponding video playback data and standby control commands.
  • the television control module 140 includes: a DC voltage DCDC converter 141 and a switch control unit 142; the main controller 110 is connected to the DC voltage DCDC converter 141.
  • the DC voltage DCDC converter 141 is respectively connected to one end of the Internet access module 160 and the switch control unit 142, and the DC voltage DCDC converter 141 controls the disconnection of the Internet access module 160 according to the standby control command sent by the main controller 110.
  • the power supply of the switch control unit 142; the main controller 110 is connected to one end of the switch control unit 142, the other end of the switch control unit 142 is connected to the display module 150, and the switch control unit 142 is sent according to the main controller 110.
  • the standby control command controls to turn off the power supply to the display module 150.
  • the switch control unit is a MOS tube.
  • the television control module 140 further includes: a data transceiver unit 143; the main controller 110 is connected to one end of the data transceiver unit 143, and the data transceiver unit 143 The other end is connected to the display module; the data transceiver unit 143 receives the video play data sent by the main controller 110, and transmits the video play data to the display module, and plays the display through the display module.
  • the display module 150 can be an LED liquid crystal display or a CRT display; CM module and/or Wi-Fi module, where the Wi-Fi module is independent of the main chip of the digital television terminal and is completed by using an external network processing chip;
  • the digital television system processes the video signal output by the video source terminal and the standby signal transmitted by the standby signal transmitting device by the main controller to obtain video playing data and standby control commands, and the video is controlled by the television control module.
  • the playback data is transmitted to the display module for play display, and the power supply to the display module and the internet module is disconnected according to the standby control command in the main controller, the device has high integration degree, simple design structure, low cost, and can be in standby state. Provide users with Internet access.

Abstract

本发明适用于数字电视技术领域，提供了一种数字电视系统，包括数字电视终端、与所述数字电视终端连接的视频源终端以及与所述数字电视终端连接的待机信号发射装置；所述数字电视终端包括主控制器、视频信号接收器、待机信号接收器、电视控制模块、显示模块和上网模块；所述视频源终端通过所述视频信号接收模块与所述主控制器输入端连接；所述待机信号发射装置通过待机信号接收器与所述主控制器输入端连接；所述主控制器的输出端与所述电视控制模块输入端连接，所述电视控制模块输出端分别与所述显示模块和所述上网模块连接，本发明的数字电视系统的设备集成度高，设计结构简单，成本低，并在待机状态下可为用户提供上网服务。

Description

一种数字电视系统 技术领域
本发明属于数字电视技术领域，尤其涉及一种数字电视系统。
 背景技术
随着数字信号处理技术、大规模集成电路、计算机和通信技术的迅速发展与结合，促使广播电视领域正面临着一场新的革命，进入了由模拟电视向数字电视跨越的时代。数字电视不仅提高了节目质量，且具有高效传输、高质量画面伴音、高性能的抗干扰接收等优势；随着数字电视广播技术的发展和普及，数字电视逐渐成为了家庭信息接收单元、娱乐与消费的平台。
但是，现有技术中，视频源终端与数字电视终端通过HDMI接口线或DP接口线对接时需外挂一个存储器，造成了资源浪费，在电路的布局上增加尺寸增加布局难度，并且数字电视终端处于待机状态时，数字电视终端中的上网模块就无法正常工作了，也就无法为用户提供上网服务。
 技术问题
本发明实施例提供一种数字电视系统，本发明的数字电视系统的设备集成度高，设计结构简单，费用成本低，并在待机状态下可为用户提供上网服务。
 技术解决方案
本发明实施例是这样实现的，一种数字电视系统，包括数字电视终端、与所述数字电视终端连接的视频源终端以及与所述数字电视终端连接的待机信号发射装置；所述数字电视终端包括主控制器、视频信号接收器、待机信号接收器、电视控制模块、显示模块和上网模块；所述视频源终端通过所述视频信号接收模块与所述主控制器输入端连接；所述待机信号发射装置通过待机信号接收器与所述主控制器输入端连接；所述主控制器的输出端与所述电视控制模块输入端连接，所述电视控制模块输出端分别与所述显示模块和所述上网模块连接。
优选地，所述视频信号接收器包括至少一个HDMI接口设备，所述视频源终端通过所述至少一个HDMI接口设备中的第一HDMI接口设备与所述主控制器连接，所述第一HDMI接口设备为所述至少一个HDMI接口设备中的任一个。
优选地，所述至少一个HDMI接口设备中的每个HDMI接口设备均设置有一HDMI接口线，所述视频源终端设置有第一HDMI接口，所述主控制器设置有第二HDMI接口。
优选地，所述视频信号接收器包括至少一个DP接口设备，所述视频源终端通过所述至少一个DP接口设备中的第一DP接设备与所述主控制器连接，所述第一DP接口设备为所述至少一个DP接口设备中的任一个。
优选地，所述至少一个DP接口设备中的每个DP接口设备均设置有一DP接口线，所述视频源终端设置有第一DP接口，所述主控制器设置有第二DP接口。
优选地，所述待机信号接收模块为红外线接收器。
优选地，所述主控制器，包括：
信号提取单元，用于从所述视频源终端传输的视频信号和从所述待机信号发射器发射的待机信号中提取用于解调的视频载波信号和待机载波信号；
解调单元，用于对提取的视频载波信号和待机载波信号进行解调，得到视频基带信号和待机基带信号；
基带信号转换模块，用于对视频基带信号和待机基带信号进行交织变换，并输出视频变换数据和待机变换数据；以及
基带信号解码单元，用于对基带信号转换模块输出的视频变换数据和待机变换数据进行解码，得到对应的视频播放数据和待机控制指令。
优选地，所述电视控制模块，包括：直流电压DCDC转换器和开关控制单元；所述主控制器与所述直流电压DCDC转换器连接，所述直流电压DCDC转换器分别与所述上网模块和所述开关控制单元一端连接，所述直流电压DCDC转换器根据主控制器发送的待机控制指令控制断开对上网模块和开关控制单元的供电 ；
所述主控制器与开关控制单元一端连接，所述开关控制单元的另一端与显示模块连接，所述开关控制单元根据主控制器发送的待机控制指令控制断开对显示模块的供电。
优选地，所述开关控制单元为MOS管。
优选地，所述电视控制模块，还包括：数据收发单元；所述主控制器与所述数据收发单元的一端连接，所述数据收发单元的另一端与所述显示模块连接；所述数据收发单元接收所述主控制器发送的视频播放数据，并将该视频播放数据传输至显示模块，通过显示模块播放显示。
 有益效果
本发明实施例提供的数字电视系统，通过主控制器对视频源终端输出的视频信号和待机信号发射装置发射的待机信号进行处理，得到视频播放数据和待机控制指令，并通过电视控制模块将视频播放数据传输至显示模块进行播放显示，以及根据主控制器中的待机控制指令控制断开对显示模块和上网模块的供电，设备集成度高，设计结构简单，成本低，并在待机状态下可为用户提供上网服务。
 附图说明
图1是本发明实施例提供的一种数字电视系统的结构示意图；
图2是本发明实施例提供的主控制器的结构示意图；
图3是本发明实施例提供的一种电视控制模块的结构示意图；
图4是本发明实施例提供的另一种电视控制模块的结构示意图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明实施例提供的数字电视系统，通过主控制器对视频源终端输出的视频信号和待机信号发射装置发射的待机信号进行处理，得到视频播放数据和待机控制指令，并通过电视控制模块将视频播放数据传输至显示模块进行播放显示，以及根据主控制器中的待机控制指令控制断开对显示模块和上网模块的供电，设备集成度高，设计结构简单，成本低，并在待机状态下可为用户提供上网服务。
以下结合具体实施例对本发明的具体实现进行详细描述。
如图1所示，在本发明实施例中，一种数字电视系统10，包括数字电视终端100、与所述数字电视终端连接的视频源终端200以及与所述数字电视终端连接的待机信号发射装置300；所述数字电视终端100包括主控制器110、视频信号接收器120、待机信号接收器130、电视控制模块140、显示模块150和上网模块160；所述视频源终端200通过所述视频信号接收模块120与所述主控制器110输入端连接；所述待机信号发射装置300通过待机信号接收器130与所述主控制器110输入端连接；所述主控制器110的输出端与所述电视控制模块140输入端连接，所述电视控制模块140输出端分别与所述显示模块150和所述上网模块160连接；通过主控制器对视频源终端输出的视频信号和待机信号发射装置发射的待机信号进行处理，得到视频播放数据和待机控制指令，并通过电视控制模块将视频播放数据传输至显示模块进行播放显示，以及根据主控制器中的待机控制指令控制断开对显示模块和上网模块的供电，设备集成度高，设计结构简单，成本低，并在待机状态下可为用户提供上网服务。
作为一个优选实施例，所述视频信号接收器130包括至少一个HDMI接口设备，所述视频源终端通过所述至少一个HDMI接口设备中的第一HDMI接口设备与所述主控制器连接，所述第一HDMI接口设备为所述至少一个HDMI接口设备中的任一个。其中，所述至少一个HDMI接口设备中的每个HDMI接口设备均设置有一HDMI接口线，所述视频源终端设置有第一HDMI接口，所述主控制器设置有第二HDMI接口。
作为另一个优选实施例，所述视频信号接收器130包括至少一个DP接口设备，所述视频源终端通过所述至少一个DP接口设备中的第一DP接设备与所述主控制器连接，所述第一DP接口设备为所述至少一个DP接口设备中的任一个。其中，所述至少一个DP接口设备中的每个DP接口设备均设置有一DP接口线，所述视频源终端设置有第一DP接口，所述主控制器设置有第二DP接口。
在本实施例中，所述待机信号接收模块130可为红外线接收器，也可以为蓝牙接收器或是其它无线接收器。
在本实施例中，如图2所示，所述主控制器110，包括：信号提取单元111、解调单元112、基带信号转换单元113和基带信号解码单元114。其中，所述信号提取单元111，用于从所述视频源终端传输的视频信号和从所述待机信号发射器发射的待机信号中提取用于解调的视频载波信号和待机载波信号；所述解调单元112，用于对提取的视频载波信号和待机载波信号进行解调，得到视频基带信号和待机基带信号；所述基带信号转换模块113，用于对视频基带信号和待机基带信号进行交织变换，并输出视频变换数据和待机变换数据；所述基带信号解码单元114，用于对基带信号转换模块输出的视频变换数据和待机变换数据进行解码，得到对应的视频播放数据和待机控制指令。
在本实施例中，如图3所示，所述电视控制模块140，包括：直流电压DCDC转换器141和开关控制单元142；所述主控制器110与所述直流电压DCDC转换器141连接，所述直流电压DCDC转换器141分别与所述上网模块160和所述开关控制单元142一端连接，所述直流电压DCDC转换器141根据主控制器110发送的待机控制指令控制断开对上网模块160和开关控制单元142的供电；所述主控制器110与开关控制单元142一端连接，所述开关控制单元142的另一端与显示模块150连接，所述开关控制单元142根据主控制器110发送的待机控制指令控制断开对显示模块150的供电。其中，所述开关控制单元为MOS管。
在本实施例中，如图4所示，所述电视控制模块140，还包括：数据收发单元143；所述主控制器110与所述数据收发单元143的一端连接，所述数据收发单元143的另一端与所述显示模块连接；所述数据收发单元143接收所述主控制器110发送的视频播放数据，并将该视频播放数据传输至显示模块，通过显示模块播放显示。
在本实施例中，所述显示模块150可为LED液晶显示器或CRT显示器；所述上网模块160可为 CM模块和/或Wi-Fi模块，此处的 Wi-Fi 模块为独立于数字电视终端的主芯片并使用外置网络处理芯片完成；
上述发明实施例提供的数字电视系统，通过主控制器对视频源终端输出的视频信号和待机信号发射装置发射的待机信号进行处理，得到视频播放数据和待机控制指令，并通过电视控制模块将视频播放数据传输至显示模块进行播放显示，以及根据主控制器中的待机控制指令控制断开对显示模块和上网模块的供电，设备集成度高，设计结构简单，成本低，并在待机状态下可为用户提供上网服务。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种数字电视系统，包括数字电视终端、与所述数字电视终端连接的视频源终端以及与所述数字电视终端连接的待机信号发射装置；其特征在于，所述数字电视终端包括主控制器、视频信号接收器、待机信号接收器、电视控制模块、显示模块和上网模块；所述视频源终端通过所述视频信号接收模块与所述主控制器输入端连接；所述待机信号发射装置通过待机信号接收器与所述主控制器输入端连接；所述主控制器的输出端与所述电视控制模块输入端连接，所述电视控制模块输出端分别与所述显示模块和所述上网模块连接。
  2. 如权利要求1所述的数字电视系统，其特征在于，所述视频信号接收器包括至少一个HDMI接口设备，所述视频源终端通过所述至少一个HDMI接口设备中的第一HDMI接口设备与所述主控制器连接，所述第一HDMI接口设备为所述至少一个HDMI接口设备中的任一个。
  3. 如权利要求2所述的数字电视系统，其特征在于，所述至少一个HDMI接口设备中的每个HDMI接口设备均设置有一HDMI接口线，所述视频源终端设置有第一HDMI接口，所述主控制器设置有第二HDMI接口。
  4. 如权利要求1所述的数字电视系统，其特征在于，所述视频信号接收器包括至少一个DP接口设备，所述视频源终端通过所述至少一个DP接口设备中的第一DP接设备与所述主控制器连接，所述第一DP接口设备为所述至少一个DP接口设备中的任一个。
  5. 如权利要求4所述的数字电视系统，其特征在于，所述至少一个DP接口设备中的每个DP接口设备均设置有一DP接口线，所述视频源终端设置有第一DP接口，所述主控制器设置有第二DP接口。
  6. 如权利要求1所述的数字电视系统，其特征在于，所述待机信号接收模块为红外线接收器。
  7. 如权利要求1所述的数字电视系统，其特征在于，所述主控制器，包括：
    信号提取单元，用于从所述视频源终端传输的视频信号和从所述待机信号发射器发射的待机信号中提取用于解调的视频载波信号和待机载波信号；
    解调单元，用于对提取的视频载波信号和待机载波信号进行解调，得到视频基带信号和待机基带信号；
    基带信号转换模块，用于对视频基带信号和待机基带信号进行交织变换，并输出视频变换数据和待机变换数据；以及
    基带信号解码单元，用于对基带信号转换模块输出的视频变换数据和待机变换数据进行解码，得到对应的视频播放数据和待机控制指令。
  8. 如权利要求7所述的数字电视系统，其特征在于，所述电视控制模块，包括：直流电压DCDC转换器和开关控制单元；所述主控制器与所述直流电压DCDC转换器连接，所述直流电压DCDC转换器分别与所述上网模块和所述开关控制单元一端连接，所述直流电压DCDC转换器根据主控制器发送的待机控制指令控制断开对上网模块和开关控制单元的供电 ；
    所述主控制器与开关控制单元一端连接，所述开关控制单元的另一端与显示模块连接，所述开关控制单元根据主控制器发送的待机控制指令控制断开对显示模块的供电。
  9. 如权利要求8所述的数字电视系统，其特征在于，所述开关控制单元为MOS管。
  10. 如权利要求8所述的数字电视系统，其特征在于，所述电视控制模块，还包括：数据收发单元；所述主控制器与所述数据收发单元的一端连接，所述数据收发单元的另一端与所述显示模块连接；所述数据收发单元接收所述主控制器发送的视频播放数据，并将该视频播放数据传输至显示模块，通过显示模块播放显示。
PCT/CN2017/082870 2017-05-03 2017-05-03 一种数字电视系统 WO2018201333A1 (zh)

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CN102625061A (zh) * 2012-03-09 2012-08-01 深圳市同洲电子股份有限公司 Tv主板、多待机方式的数字电视及方法
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