WO2014205992A1 - 多终端同步显示方法、显示装置及显示装置级联系统 - Google Patents

多终端同步显示方法、显示装置及显示装置级联系统 Download PDF

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Publication number
WO2014205992A1
WO2014205992A1 PCT/CN2013/087536 CN2013087536W WO2014205992A1 WO 2014205992 A1 WO2014205992 A1 WO 2014205992A1 CN 2013087536 W CN2013087536 W CN 2013087536W WO 2014205992 A1 WO2014205992 A1 WO 2014205992A1
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Prior art keywords
audio
signal
level
display device
video
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PCT/CN2013/087536
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English (en)
French (fr)
Inventor
刘建福
苏立军
Original Assignee
京东方科技集团股份有限公司
北京京东方专用显示科技有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方专用显示科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/375,062 priority Critical patent/US9766851B2/en
Publication of WO2014205992A1 publication Critical patent/WO2014205992A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1446—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display display composed of modules, e.g. video walls
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1431—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using a single graphics controller
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • G06F3/1438—Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display using more than one graphics controller
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/12—Synchronisation between the display unit and other units, e.g. other display units, video-disc players
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/02—Composition of display devices
    • G09G2300/026—Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/04—Display device controller operating with a plurality of display units
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/02—Networking aspects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G09G2370/042—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller for monitor identification
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G09G2370/045—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial
    • G09G2370/047—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller using multiple communication channels, e.g. parallel and serial using display data channel standard [DDC] communication
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/14—Use of low voltage differential signaling [LVDS] for display data communication
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2380/00—Specific applications
    • G09G2380/06—Remotely controlled electronic signs other than labels

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a multi-terminal synchronous display method, a display device, and a display device cascading system. Background technique
  • the existing rail transit display audio and video signal transmission scheme in the interior of the cabin is usually a signal controller of one car, such a signal controller encodes multiple differential signal outputs, and is connected to each display terminal by using a network cable at the same time.
  • the purpose of the signal controller is simultaneously transmitted to each display terminal.
  • the signal controller 1 1 is connected to four display terminals through a network cable.
  • the line length of the network cable between the signal controller 11 and the display terminal 121 is usually 20 m.
  • the network cable between the signal controller 1 1 and the display terminal 122 The line length is 30m, and the rest of the levels are analogous. It can be seen that when there are 4 display terminals, the bus length connecting the signal controller and the display terminal is about 140 m.
  • the use of this synchronous display scheme involves the problem of multiple wires being bent at the same time during installation. The network cable routing is very cumbersome, and as the distance between the display terminal and the signal controller increases, the length of the audio and video logic lines will also be large. Increase, this will also increase the cost of network cable settings. Summary of the invention
  • an embodiment of the present invention provides a multi-terminal synchronous display method, a display device, and a display device cascading system, which can reduce a signal controller and a display terminal.
  • An aspect of the present invention provides a multi-terminal synchronous display method, including: receiving an audio and video signal;
  • a display device including:
  • a receiving unit configured to receive an audio and video signal
  • a processing unit configured to obtain a driving signal of the current level according to the received audio and video signal, where the driving signal of the current level is used to drive audio and video output of the display device of the current level, and the processing unit is further configured to drive the current level Reducing the signal to the audio and video signal;
  • an output unit configured to input the restored audio and video signal to the next-level display device, so that the current-level display device is output synchronously with the audio and video of the next-level display device.
  • a display device cascading system includes: a signal controller and a plurality of display devices as described above.
  • the multi-terminal synchronous display method, the display device and the display device cascading system provided by the embodiments of the present invention receive the audio and video signals sent by the signal controller according to the received audio and video signals by using the cascading manner. While obtaining the signal for driving the audio and video output of the display device of the present stage, the audio and video signals can be outputted to the next-level display device through gain amplification, thereby realizing the synchronization of audio and video between the display device of the first level and the display device of the next level. Output.
  • the driving signals of the display devices of the remaining stages are all from the upper-level display device cascaded therewith, thereby avoiding the separate connection between the signal controller and each display device, thereby greatly reducing the number of connections.
  • the long logic line significantly reduces the difficulty of wiring between the signal controller and the display terminal and the cost of the network cable setting.
  • FIG. 1 is a schematic structural diagram of a display terminal cascading system in the prior art
  • FIG. 2 is a schematic flow chart of a multi-terminal synchronous display method according to an embodiment of the present invention
  • FIG. 3 is a schematic flow chart of another multi-terminal synchronization display method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of circuit connection of a video cascade in a multi-terminal synchronous display method according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of another display device according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a display device cascading system according to an embodiment of the present invention. detailed description
  • a multi-terminal synchronous display method includes the following operations:
  • step S201 the display device of the present stage receives the audio and video signals.
  • the audio and video signals may be specifically divided into a video signal and an audio signal.
  • the video signal may be a differential video image array VGA (Video Graphics Array) signal
  • the audio signal may be a differential audio signal.
  • the first-level display device receives the audio and video signals sent by the signal controller, the remaining levels of the display devices receive the audio and video signals output by the display device of the previous level.
  • step S202 the display device of the present stage obtains a driving signal of the current level according to the received audio and video signal, and the driving signal of the current level is used for driving the audio and video output of the display device of the current level.
  • the display device of the current stage can obtain a non-differential VGA signal or an audio signal by corresponding decoding according to the received differential VGA signal or differential audio signal.
  • the differential VGA signal realizes the video output of the display device of the present level, and realizes the audio output of the display device of the present level through the audio signal.
  • step S203 the display device of the present stage restores the driving signal of the current level to an audio and video signal.
  • step S204 the display device of the present stage inputs the restored audio and video signal to the display device of the next level, so that the display device of the present level is output synchronously with the audio and video of the next-level display device.
  • the multi-terminal synchronous display method receives the audio and video signals sent by the signal controller by using the cascading mode, and obtains the sound for driving the display device of the present level according to the received audio and video signals.
  • the audio and video signals can be output to the next-level display device through gain amplification, so as to realize the synchronous output of audio and video between the display device of the present level and the display device of the next level.
  • the driving signals of the display devices of the remaining stages are all from the upper-level display device cascaded therewith, thereby avoiding the separate connection between the signal controller and each display device, thereby greatly reducing the number of connections.
  • the long logic line significantly reduces the difficulty of wiring between the signal controller and the display terminal and the cost of the network cable setting.
  • the multi-terminal synchronization display method may include the following operations:
  • step S301 the display device of the present stage receives the audio and video signals.
  • the audio and video signals may be specifically divided into a video signal and an audio signal.
  • the video signal can be a differential VGA signal
  • the audio signal can be a differential audio signal.
  • the first-level display device receives the audio and video signals sent by the signal controller, the remaining levels of the display devices receive the audio and video signals output by the display device of the previous level.
  • step S302 the display device of the present stage obtains the video driving signal of the current level by decoding the received video signal, and/or converts the received audio signal into the audio driving signal of the current level through isolation and transformation.
  • the display device of the present stage can decode the received differential VGA signal through a decoder to obtain a non-differential standard VGA signal (including R (red), G (green), B (blue), H (rows, respectively). ), V (column)).
  • the ISL59910 chip can be used as a decoder for decoding video signals.
  • the ISL59910 is a three-channel differential receiver and equalizer with three high-speed differential receivers with frequency and Gain for equalization adjustment.
  • the ISL59910 has a bandwidth of 150 MHz and the equalization length is set by the voltage on a separate pin.
  • the ISL59910 features common-mode decoding that decodes information in both horizontal and vertical directions. By adopting such a decoding chip, the gain of the signal can be realized while the signal decoding is completed, thereby ensuring the quality of the signal input to the display device of the next stage.
  • the display device of the present stage can process the received differential audio signal through an isolation transformer to obtain a non-differential audio signal.
  • the isolation transformer can also effectively prevent the audio output of the signal controller and the audio input of the display device from entering the external noise, ensuring the quality of the input audio signal of the display device.
  • step S303 the display device of the present stage restores the video driving signal of the current level to a video signal by the encoding process, and/or restores the audio driving signal of the current level to an audio signal by operational amplification and isolation and transformation processing.
  • the EL4543 chip can be used to encode video signals.
  • the EL4543 is a high-bandwidth (350 MHz) three-way differential amplifier that provides complete encoding of the video sync signal. Its input is suitable for processing high-speed video or other communication signals in single-ended or differential form. High bandwidth is a differential signal on a standard twisted pair or coaxial cable with very low harmonic distortion. At the same time, internal feedback ensures that the output has a stable gain and phase to reduce radiated electromagnetic interference and harmonics.
  • the embedded logic encodes the standard video horizontal and vertical sync signals onto the common-mode signal of the twisted pair.
  • the VGA signal with sync information is input to the red-green-blue (RGB) signal and is connected to the 75 ⁇ termination resistor on the EL4543 input.
  • the single-ended RGB signal is converted to a differential mode signal, and the horizontal sync signal (HSYNC) and the column sync signal (VSYNC) are encoded on the respective common mode signals of the three differential signals.
  • the EL4543's 50 ⁇ termination output drives differential R, G, B, and the sync signal is encoded in the common mode of the CAT-5 twisted pair cable. For systems without signal frequency equalization, a good transmission can be achieved on a 200-foot CAT-5 twisted pair.
  • the display device of the present stage can also restore the non-differential audio signal to a differential audio signal through operational amplification and isolation transformer processing.
  • the MC4558 op amp can be introduced, which ensures the quality of the audio signals output by each type of display device.
  • step S304 the display device of the present stage inputs the restored audio and video signal to the display device of the next level, so that the display device of the current level is output synchronously with the audio and video of the next-level display device.
  • step S305 the display device of the present stage obtains a low-voltage differential signal for display according to the video drive signal of the current stage, and/or performs audio output processing after the audio drive signal of the present stage is subjected to power amplification.
  • the display device of the present stage performs video decoding on the signal through the chip ISL59910, and outputs a standard VGA signal, which is followed by the standard VGA signal.
  • the frequency divider can use the chip TSUMV39LU, output low voltage differential signal LVDS (Low-Voltage Differential Signaling) to the LCD screen, the other way through the EL4543 for video encoding and output to the next display terminal to complete the video cascade solution .
  • one of the non-differential audio signals processed by the display device according to the differential audio signal from the signal controller through the isolation transformer can be further processed by the power amplifier TDA7496 for audio output.
  • step S306 the audio display output signal of the display device of the present level is fed back to the signal controller.
  • the audio and video output signals output by the frequency divider TSUMV39LU can be fed back to the signal controller through the audio signal receiving end, and for the remaining levels of the display device, since not directly with the signal controller Connected, the feedback signal can be fed back to the previous level display device through the audio signal receiving end, and finally input to the signal controller.
  • the TSUMV39LU has no output signal output, and the signal is returned to the signal control terminal through the audio signal receiving end, so that the host can monitor each display device in time. Whether it works properly, which provides accurate information for fault detection and subsequent repairs.
  • the multi-terminal synchronous display method receives the audio and video signals sent by the signal controller by using the cascading mode, and obtains the sound for driving the display device of the present level according to the received audio and video signals.
  • the audio and video signals can be output to the next-level display device through gain amplification, so as to realize the synchronous output of audio and video between the display device of the present level and the display device of the next level.
  • the driving signals of the display devices of the remaining stages are all from the upper-level display device cascaded therewith, thereby avoiding the separate connection between the signal controller and each display device.
  • the logic line length is greatly reduced, and the wiring difficulty between the signal controller and the display terminal and the cost of the network cable setting are significantly reduced.
  • a display device may include the following components:
  • a receiving unit 51 configured to receive an audio and video signal
  • the processing unit 52 is configured to obtain a driving signal of the current level according to the received audio and video signal, where the driving signal of the first stage is used to drive the audio and video output of the display device of the current level, and the processing unit 52 is further configured to restore the driving signal of the current level to the sound.
  • Video signal
  • the output unit 53 is configured to input the restored audio and video signal to the next-level display device, so that the display device of the current level is output synchronously with the audio and video of the next-level display device.
  • the display device receives the audio and video signals sent by the signal controller by using the cascaded manner, and obtains the audio and video output for driving the display device of the current level according to the received audio and video signals.
  • the audio and video signals can be output to the next-level display device through gain amplification, so as to realize the synchronous output of audio and video between the display device of the present level and the display device of the next level.
  • the driving signals of the display devices of the remaining stages are all from the upper-level display device cascaded therewith, thereby avoiding the separate connection between the signal controller and each display device, thereby greatly reducing the number of connections.
  • the long logic line significantly reduces the difficulty of wiring between the signal controller and the display terminal and the cost of the network cable setting.
  • the display device may specifically include various display devices applied to the display of the outdoor, the station or the interior of the car, for example, any display such as a liquid crystal panel, an OLED panel, a flat panel television, a digital photo frame, a navigator, or the like. Functional product or part.
  • the first-level display device receives the audio and video signals sent by the signal controller, the remaining levels of the display devices receive the audio and video signals output by the display device of the previous level.
  • the display device may further include:
  • the feedback module 54 is configured to feed back the audio and video output signals of the display device of the present level to the signal controller.
  • the audio and video signals may be specifically divided into a video signal and an audio signal.
  • the video signal may be a differential VGA signal
  • the audio signal may be a differential audio signal.
  • the processing unit 52 can include:
  • the decoder 521 is configured to obtain a video driving signal of the current level by decoding the received video signal.
  • the differential VGA signal received by the display device of the current level can be decoded by the decoder to obtain a non-differential standard VGA signal (including R (red), G (green), B (blue), H (row) respectively. , V (column)).
  • the ISL59910 chip can be used as a decoder for decoding video signals.
  • the ISL59910 is a three-channel differential receiver and equalizer with three high-speed differential receivers for equalizing the frequency and gain.
  • the ISL59910 has a bandwidth of 150 MHz and the equalization length is set by the voltage on a separate pin.
  • the ISL59910 features common-mode decoding that decodes information in both horizontal and vertical directions. By using such a decoding chip, the gain of the signal can be realized while the signal decoding is completed, thereby ensuring the quality of the signal input to the display device of the next stage.
  • Processing unit 52 can include:
  • the first isolation transformer 522 is configured to obtain the audio drive signal of the first stage by using the received audio signal through isolation and voltage transformation.
  • the display device of the present stage can also process the received differential audio signal through an isolation transformer to obtain a non-differential audio signal.
  • the isolation transformer can also effectively prevent the audio output of the signal controller and the audio input of the display device from entering the external noise, thereby ensuring the quality of the audio signal input by the display device.
  • processing unit 52 may further include:
  • the encoder 523 is configured to restore the video drive signal of the current level to a video signal by using an encoding process.
  • the EL4543 chip can be used to encode the video signal.
  • the EL4543 is a high-bandwidth (350 MHz) three-way differential amplifier that provides complete encoding of the video sync signal. Its input is suitable for processing high-speed video or other communication signals in single-ended or differential form. High bandwidth is a differential signal on a standard twisted pair or coaxial cable with very low harmonic distortion. At the same time, internal feedback ensures that the output has a stable gain and phase to reduce radiated electromagnetic interference and harmonics.
  • the embedded logic encodes the standard video horizontal and vertical sync signals onto the twisted pair common mode signal, and the VGA signal with sync information is input to the RGB (red, green, and blue) signal and connected to the 75 ⁇ termination resistor on the EL4543 input.
  • Single-ended RGB signals are converted to differential mode signals, HSYNC (row sync signal) and VSYNC (column sync signal) are encoded on the common mode signals of the three differential signals.
  • the EL4543's 50 ⁇ termination output drives differential R, G, B, and the sync signal is encoded in the common mode of the CAT-5 twisted pair cable. For systems without signal frequency equalization, it can be transmitted well on a 200-foot CAT-5 twisted pair.
  • the processing unit 52 can also include:
  • the operational amplifier 524 and the second isolation transformer 525 are used to restore the audio drive signal of the present stage to an audio signal by operation amplification and isolation and transformation processing.
  • the MC4558 op amp can be introduced, which ensures the quality of the audio signals output by each type of display device.
  • the display device may further include:
  • the frequency divider 55 is configured to obtain a low voltage differential signal for display according to the video driving signal of the current stage.
  • the display device of this stage performs video decoding on the signal through the chip ISL59910, and outputs a standard VGA signal, as shown in FIG. 4, the path of the standard VGA signal.
  • the divider can use the chip TSUMV39LU, output low voltage differential signal LVDS (Low-Voltage Differential Signaling) to the LCD screen, another path through the EL4543 for video encoding and output to the next display terminal to complete the video cascade Program.
  • LVDS Low-Voltage Differential Signaling
  • the display device may further include:
  • the power amplifier 56 is configured to perform audio output after the audio drive signal of the present stage is subjected to power amplification processing.
  • the display device of the present stage processes the path of the non-differential audio signal by the differential transformer according to the differential audio signal sent by the signal controller, and can further process the non-differential audio signal through the power amplifier TDA7496 and perform audio output. .
  • the audio and video output signals output by the frequency divider 55 can be fed back to the signal controller through the first isolation transformer 522.
  • the audio and video output signals output by the frequency divider TSUMV39LU can be fed back to the signal controller through the audio signal receiving end, and for the remaining levels of the display device, since not directly with the signal controller Connected, the feedback signal can be fed back to the previous level display device through the audio signal receiving end, and finally the input signal is controlled. Controller.
  • the TSUMV39LU has no output signal output, and the signal is returned to the signal control terminal through the audio signal receiving end, so that the host can monitor each display device in time. Whether it works properly, which provides accurate information for fault detection and subsequent repairs.
  • the display device cascade system provided by the embodiment of the present invention may include: a signal controller 71 and a plurality of display devices 72 as described above.
  • the structure of the display device 72 has been described in detail in the foregoing embodiments and will not be described again.
  • the description is made by taking one signal controller 71 and four display devices in one car as an example. It can be seen that the signal controller 71 is directly connected to the first stage display device 721, the first stage display device 721 outputs the drive signal to the lower level display device 722, and so on to achieve the cascade of the display devices of each stage.
  • the line length between the signal controller 1 1 and the display terminal 121 is usually 20 m, and each of the two display terminals is evenly arranged by 10 m.
  • the display device cascade system has a bus length of about 50 m, which can save about 90 m of connection lines per car as compared with the prior art.
  • signal transmission may be performed between the signal controller 71 and the plurality of display devices 72 through a network cable, or a dedicated video image may be passed between the signal controller 71 and the plurality of display devices 72.
  • the array (VGA) signal line performs signal transmission. The difference is that the transmission of audio and video signals by using a dedicated VGA signal line can further improve the signal transmission efficiency, but the cost of the dedicated VGA signal line is relatively higher than the network cable, and the wire is thicker and harder, and the construction wiring has certain difficulty. In addition, the transmission distance of the dedicated VGA signal line is limited, and it is difficult to feedback the logic level of the display device 72 to the signal controller 71.
  • the display device cascading system of the embodiment of the invention includes a signal controller and a plurality of display devices.
  • Each of the first-level display devices receives the audio and video signals sent by the signal controller according to the received audio and video signals. While obtaining a signal for driving the audio and video output of the display device of the present stage, the audio and video signals can also be outputted by gain amplification to the lower
  • the first-level display device realizes synchronous output of audio and video between the display device of the first level and the display device of the next level.
  • the driving signals of the display devices of the remaining stages are all from the upper-level display device cascaded therewith, thereby avoiding the separate connection between the signal controller and each display device, thereby greatly reducing the number of connections.
  • the long logic line significantly reduces the difficulty of wiring between the signal controller and the display terminal and the cost of the network cable setting.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Graphics (AREA)
  • Multimedia (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

一种多终端同步显示方法、显示装置及显示装置级联系统。所述方法包括：接收音视频信号；根据接收到的所述音视频信号得到本级驱动信号，所述本级驱动信号用于驱动本级显示装置音视频输出；将所述本级驱动信号还原为所述音视频信号；将还原的所述音视频信号输入下一级显示装置，以使得所述本级显示装置与所述下一级显示装置音视频同步输出。上述技术方案可以有效降低信号控制器与显示终端之间的布线难度及网线设置的成本。

Description

多终端同步显示方法、 显示装置及显示装置级联系统
技术领域
本发明涉及显示技术领域， 尤其涉及一种多终端同步显示方法、 显示装置及显示装置级联系统。 背景技术
近年来， 随着显示技术的不断发展， 高性能的显示装置已越来越 多地应用于包括广场、 车站、 服务窗口以及轨道交通车厢在内的各种 公共场所。 尤其是对于轨道交通车厢而言， 车厢内部通常安装有多个 显示终端， 为了保证同一车厢内以及不同车厢之间的乘客能够同时观 看到显示画面， 这就要求各个显示终端显示信号的高度同步。
随着城市轨道交通的高速发展， 对于轨道交通车辆需求也在不断 增多， 车辆工作人员对应现场施工筒单化的要求也越来越高。 现有轨 道交通在车厢内部显示终端音视频信号传输方案通常为一节车厢一台 信号控制器， 这样的一台信号控制器编码多路差分信号输出， 利用网 线同时连接到每一台显示终端以达到信号控制器同时传输到每台显示 终端的目的。 如图 1所示， 以一节车厢设置有 1 个信号控制器和 4 台 显示终端为例， 信号控制器 1 1通过网线分别与 4台显示终端相连接。 在实际应用的过程中， 信号控制器 1 1与显示终端 121之间网线的线长 通常为 20m, 如果每两台显示终端分隔 10m均匀排列， 则信号控制器 1 1与显示终端 122之间网线的线长为 30m, 其余各级以此类推。 可以 看到， 当具有 4 台显示终端时， 连接信号控制器和显示终端的总线长 为约 140m。 此外， 采用这种同步显示方案涉及到安装时多股网线同时 布线进行折弯的问题， 网线布线非常繁瑣， 且随着显示终端与信号控 制器距离的增加， 音视频逻辑线长也将大幅度增加， 这也将使得网线 设置的成本进一步增加。 发明内容
为解决上述技术问题， 本发明的实施例提供一种多终端同步显示 方法、 显示装置及显示装置级联系统， 可以降低信号控制器与显示终 端之间的布线难度及网线设置的成本。
本发明的实施例可采用如下技术方案：
本发明实施例的一方面， 提供一种多终端同步显示方法， 包括： 接收音视频信号；
根据接收到的所述音视频信号得到本级驱动信号， 所述本级驱动 信号用于驱动本级显示装置音视频输出；
将所述本级驱动信号还原为所述音视频信号；
将还原的所述音视频信号输入下一级显示装置， 以使得所述本级 显示装置与所述下一级显示装置音视频同步输出。
本发明实施例的另一方面， 提供一种显示装置， 包括：
接收单元， 用于接收音视频信号；
处理单元， 用于根据接收到的所述音视频信号得到本级驱动信号， 所述本级驱动信号用于驱动本级显示装置音视频输出， 所述处理单元 还用于将所述本级驱动信号还原为所述音视频信号；
输出单元， 用于将还原的所述音视频信号输入下一级显示装置， 以使得所述本级显示装置与所述下一级显示装置音视频同步输出。
本发明实施例的又一方面， 提供一种显示装置级联系统， 包括： 信号控制器和多个如上所述的显示装置。
本发明实施例提供的多终端同步显示方法、 显示装置及显示装置 级联系统， 通过采用级联的方式， 每一级显示装置接收信号控制器发 送的音视频信号， 根据接收到的音视频信号得到用于驱动本级显示装 置音视频输出的信号的同时， 还可以将音视频信号通过增益放大输出 至下一级显示装置， 实现本级显示装置与下一级显示装置之间音视频 的同步输出。 这样一来， 除了第一级显示装置， 其余各级显示装置的 驱动信号均来自于与其相级联的上一级显示装置， 从而避免了信号控 制器与各个显示装置的分别连接， 大大减少了逻辑线长， 显著降低了 信号控制器与显示终端之间的布线难度及网线设置的成本。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实 施例或现有技术描述中所需要使用的附图作筒单地介绍，显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为现有技术中一种显示终端级联系统的结构示意图；
图 2 为本发明实施例提供的一种多终端同步显示方法的流程示意 图；
图 3 为本发明实施例提供的另一多终端同步显示方法的流程示意 图；
图 4 为本发明实施例提供的多终端同步显示方法中视频级联的电 路连接示意图；
图 5为本发明实施例提供的一种显示装置的结构示意图；
图 6为本发明实施例提供的另一显示装置的结构示意图；
图 7为本发明实施例提供的一种显示装置级联系统的结构示意图。 具体实施方式
下面将结合附图，对本发明实施例中的技术方案进行清楚、完整地描述, 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是全部的实施例。 基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下 所获得的所有其他实施例， 都属于本发明保护的范围。
如图 2 所示， 按照本发明实施例的多终端同步显示方法， 包括以 下操作过程：
在步骤 S201 , 本级显示装置接收音视频信号。
其中， 音视频信号具体可以分为视频信号和音频信号， 在实际应 用的过程中， 视频信号可以是差分视频图像阵列 VGA(Video Graphics Array)信号， 音频信号可以是差分音频信号。
需要说明的是， 除第一级显示装置接收信号控制器发送的音视频 信号外， 其余各级显示装置均接收其上一级显示装置输出的音视频信 号。
在步骤 S202 , 本级显示装置根据接收到的音视频信号得到本级驱 动信号， 该本级驱动信号用于驱动本级显示装置音视频输出。
具体地， 本级显示装置可以根据接收到的差分 VGA信号或差分音 频信号通过相应的解码得到非差分的 VGA信号或是音频信号， 通过非 差分的 VGA信号实现本级显示装置视频输出， 通过音频信号实现本级 显示装置的音频输出。
在步骤 S203 , 本级显示装置将本级驱动信号还原为音视频信号。 在步骤 S204 , 本级显示装置将还原的音视频信号输入下一级显示 装置， 以使得本级显示装置与下一级显示装置音视频同步输出。
本发明实施例提供的多终端同步显示方法， 通过采用级联的方式， 每一级显示装置接收信号控制器发送的音视频信号， 根据接收到的音 视频信号得到用于驱动本级显示装置音视频输出的信号的同时， 还可 以将音视频信号通过增益放大输出至下一级显示装置， 实现本级显示 装置与下一级显示装置之间音视频的同步输出。 这样一来， 除了第一 级显示装置， 其余各级显示装置的驱动信号均来自于与其相级联的上 一级显示装置， 从而避免了信号控制器与各个显示装置的分别连接， 大大减少了逻辑线长， 显著降低了信号控制器与显示终端之间的布线 难度及网线设置的成本。
更具体地， 如图 3 所示， 本发明实施例提供的多终端同步显示方 法可包括以下操作：
在步骤 S301 , 本级显示装置接收音视频信号。
其中， 音视频信号具体可以分为视频信号和音频信号。 在实际应 用的过程中， 视频信号可以是差分 VGA信号， 音频信号可以是差分音 频信号。
需要说明的是， 除第一级显示装置接收信号控制器发送的音视频 信号外， 其余各级显示装置均接收其上一级显示装置输出的音视频信 号。
在步骤 S302 , 本级显示装置将接收到的视频信号通过解码处理得 到本级视频驱动信号， 和 /或将接收到的音频信号通过隔离变压得到本 级音频驱动信号。
具体地， 可以将本级显示装置将接收到的差分 VGA信号通过解码 器进行解码处理得到非差分的标准 VGA信号 （分别包括 R (红） ， G (绿） ， B (蓝） ， H (行） ， V (列） ） 。 例如， 可以采用 ISL59910 芯片作为解码视频信号的解码器。 需要说明的是， ISL59910是一种三 通道差分接收器和均衡器， 含有三个高速差分接收器， 具有使频率和 增益进行均衡调整的功能。 ISL59910的带宽为 150 MHz, 均衡长度是 由一个单独引脚上的电压设定。 ISL59910 的特点是共模译码， 可对水 平和垂直方向上的信息进行译码。 采用这样一种解码芯片可以在完成 信号解码的同时实现信号的增益， 从而保证了输入下一级显示装置信 号的质量。
此外， 本级显示装置还可以将接收到的差分音频信号通过隔离变 压器进行处理得到非差分的音频信号。 隔离变压器还可以有效防止信 号控制器端音频输出与显示装置音频输入串入外界噪音， 保证了显示 装置输入音频信号的质量。
在步骤 S303 , 本级显示装置将本级视频驱动信号通过编码处理还 原为视频信号， 和 /或将本级音频驱动信号通过运算放大及隔离变压处 理还原为音频信号。
例如， 与 ISL59910解码芯片相对应地， 可以采用 EL4543芯片进 行视频信号的编码。 需要说明的是， EL4543 芯片是高带宽（350 MHz) 的三路差动放大器， 可对视频同步信号进行完整的编码， 它的输入适 合处理单端或差分形式的高速视频或其他通信信号。 高带宽是标准双 绞线或同轴电缆线上的差分信号， 有非常低的谐波失真， 同时， 内部 反馈保证输出有稳定的增益和相位， 以减少辐射的电磁干扰和谐波。 嵌入逻辑将标准的视频水平和垂直同步信号编码到双绞线的共模信号 上， 带同步信息的 VGA信号输入红绿蓝 （RGB ) 信号后与 EL4543输 入端上的 75 Ω的终端电阻相连， 单端的 RGB信号被转换为差模信号， 行同步信号 （HSYNC )和列同步信号 （VSYNC )在三个差动信号各自 的共模信号上进行编码。 EL4543的 50 Ω终端输出驱动差分 R, G, B , 同步信号编码在 CAT-5双绞线电缆的共模中。 对于不带信号频率均衡 的系统， 可在 200英尺的 CAT-5双绞线上 4艮好的传输。
同理， 本级显示装置还可以将非差分的音频信号通过运算放大及 隔离变压处理还原为差分的音频信号。 例如， 为了防止长线传输线上 的功率损耗， 可以引入运放 MC4558 , 这样一来可以保证各级显示装置 输出音频信号的质量。
在步骤 S304 , 本级显示装置将还原的音视频信号输入下一级显示 装置， 以使得本级显示装置与下一级显示装置音视频同步输出。 在步骤 S305 , 本级显示装置根据本级视频驱动信号得到用于显示 的低压差分信号， 和 /或将本级音频驱动信号通过功率放大处理后进行 音频输出。
如图 4 所示， 例如， 对于视频信号而言， 当在信号控制器端发出 差分 VGA信号， 本级显示装置通过芯片 ISL59910对此信号进行视频 解码输出标准 VGA信号之后，该标准 VGA信号的一路将进入分频器， 分频器可以采用芯片 TSUMV39LU , 输出低压差分信号 LVDS ( Low- Voltage Differential Signaling ) 至液晶屏， 另一路通过 EL4543 进行视频编码并输出至下一台显示终端完成视频级联方案。
对于音频信号而言， 本级显示装置根据信号控制器发出的差分音 频信号通过隔离变压器进行处理得到的非差分的音频信号的一路可以 进一步通过功率放大器 TDA7496处理进行音频输出。
在步骤 S306 ,将本级显示装置音视频输出信号反馈至信号控制器。 具体地， 对于第一级显示装置而言， 分频器 TSUMV39LU输出的 音视频输出信号可以通过音频信号接收端反馈至信号控制器， 对于其 余各级显示装置而言， 由于并非与信号控制器直接相连， 反馈信号可 以通过音频信号接收端向前一级显示装置逐级反馈， 最终输入信号控 制器。 这样一来， 当每一台显示装置的本地信号或连接状态存在异常 时， TSUMV39LU 无输出信号输出， 该信号通过音频信号接收端返回 到信号控制端， 以便主机能够及时地监控每一台显示装置是否正常工 作， 从而为故障的检测以及后续的维修提供了准确的信息。
需要说明的是， 在本发明实施例中， 各种功能芯片均只是举例说 明， 根据电路功能， 本领域技术人员同样可以想到采用其他具有相同 或相似功能的芯片或逻辑电路， 本发明对此并不做限制。
本发明实施例提供的多终端同步显示方法， 通过采用级联的方式， 每一级显示装置接收信号控制器发送的音视频信号， 根据接收到的音 视频信号得到用于驱动本级显示装置音视频输出的信号的同时， 还可 以将音视频信号通过增益放大输出至下一级显示装置， 实现本级显示 装置与下一级显示装置之间音视频的同步输出。 这样一来， 除了第一 级显示装置， 其余各级显示装置的驱动信号均来自于与其相级联的上 一级显示装置， 从而避免了信号控制器与各个显示装置的分别连接， 大大减少了逻辑线长， 显著降低了信号控制器与显示终端之间的布线 难度及网线设置的成本。
如图 5 所示， 按照本发明实施例的显示装置， 可包括以下组成部 分：
接收单元 51 , 用于接收音视频信号；
处理单元 52 , 用于根据接收到的音视频信号得到本级驱动信号， 该本级驱动信号用于驱动本级显示装置音视频输出， 该处理单元 52还 用于将本级驱动信号还原为音视频信号；
输出单元 53 , 用于将还原的音视频信号输入下一级显示装置， 以 使得本级显示装置与下一级显示装置音视频同步输出。
本发明实施例提供的显示装置， 通过采用级联的方式， 每一级显 示装置接收信号控制器发送的音视频信号， 根据接收到的音视频信号 得到用于驱动本级显示装置音视频输出的信号的同时， 还可以将音视 频信号通过增益放大输出至下一级显示装置， 实现本级显示装置与下 一级显示装置之间音视频的同步输出。 这样一来， 除了第一级显示装 置， 其余各级显示装置的驱动信号均来自于与其相级联的上一级显示 装置， 从而避免了信号控制器与各个显示装置的分别连接， 大大减少 了逻辑线长， 显著降低了信号控制器与显示终端之间的布线难度及网 线设置的成本。
在本发明实施例中， 显示装置具体可以包括应用于户外、 车站或 车厢内部等场所显示的各种显示器件， 例如可以为液晶面板、 OLED面 板、 平板电视、 数码相框、 导航仪等任何具有显示功能的产品或部件。
需要说明的是， 除第一级显示装置接收信号控制器发送的音视频 信号外， 其余各级显示装置均接收其上一级显示装置输出的音视频信 号。
进一步地， 如图 5所示， 显示装置还可以包括：
反馈模块 54 , 用于将本级显示装置音视频输出信号反馈至信号控 制器。
在本发明实施例中， 音视频信号具体可以分为视频信号和音频信 号。 在实际应用的过程中， 视频信号可以是差分 VGA信号， 音频信号 可以是差分音频信号。 如图 6所示， 处理单元 52可以包括：
解码器 521 ,用于将接收到的视频信号通过解码处理得到本级视频 驱动信号。
具体地， 可以将本级显示装置接收到的差分 VGA信号通过解码器 进行解码处理得到非差分的标准 VGA信号（分别包括 R (红）， G (绿）， B (蓝） ， H (行） ， V (列） ） 。 例如， 可以采用 ISL59910芯片作为 解码视频信号的解码器。 需要说明的是， ISL59910是一种三通道差分 接收器和均衡器， 含有三个高速差分接收器， 具有使频率和增益进行 均衡调整的功能。 ISL59910的带宽为 150 MHz, 均衡长度是由一个单 独引脚上的电压设定。 ISL59910 的特点是共模译码， 可对水平和垂直 方向上的信息进行译码。 采用这样一种解码芯片可以在完成信号解码 的同时实现信号的增益， 从而保证了输入下一级显示装置信号的质量。
处理单元 52可以包括：
第一隔离变压器 522 ,用于将接收到的音频信号通过隔离变压得到 本级音频驱动信号。
本级显示装置还可以将接收到的差分音频信号通过隔离变压器进 行处理得到非差分的音频信号。 隔离变压器还可以有效防止信号控制 器端音频输出与显示装置音频输入串入外界噪音， 保证了显示装置输 入音频信号的质量。
进一步地， 如图 6所示， 处理单元 52还可以包括：
编码器 523 ,用于将本级视频驱动信号通过编码处理还原为视频信 号。
例如， 与 ISL59910解码芯片相对应的， 可以采用 EL4543芯片进 行视频信号的编码。 需要说明的是， EL4543 芯片是高带宽（350 MHz) 的三路差动放大器， 可对视频同步信号进行完整的编码， 它的输入适 合处理单端或差分形式的高速视频或其他通信信号。 高带宽是标准双 绞线或同轴电缆线上的差分信号， 有非常低的谐波失真， 同时， 内部 反馈保证输出有稳定的增益和相位， 以减少辐射的电磁干扰和谐波。 嵌入逻辑将标准的视频水平和垂直同步信号编码到双绞线的共模信号 上， 带同步信息的 VGA信号输入 RGB (红绿蓝）信号后与 EL4543输 入端上的 75 Ω的终端电阻相连， 单端的 RGB信号被转换为差模信号， HSYNC (行同步信号）和 VSYNC (列同步信号）在三个差动信号各自 的共模信号上进行编码。 EL4543的 50 Ω终端输出驱动差分 R, G, B , 同步信号编码在 CAT-5双绞线电缆的共模中。 对于不带信号频率均衡 的系统， 可在 200英尺的 CAT-5双绞线上很好的传输。
处理单元 52还可以包括：
运算放大器 524及第二隔离变压器 525 ,用于将本级音频驱动信号 通过运算放大及隔离变压处理还原为音频信号。
例如，为了防止长线传输线上的功率损耗，可以引入运放 MC4558 , 这样一来可以保证各级显示装置输出音频信号的质量。
进一步地， 如图 6所示， 显示装置还可以包括：
分频器 55 , 用于根据本级视频驱动信号得到用于显示的低压差分 信号。
例如，对于视频信号而言， 当在信号控制器端发出差分 VGA信号， 本级显示装置通过芯片 ISL59910 对此信号进行视频解码输出标准 VGA信号之后， 如图 4所示， 该标准 VGA信号的路径将进入分频器， 分频器可以采用芯片 TSUMV39LU , 输出低压差分信号 LVDS ( Low-Voltage Differential Signaling )至液晶屏， 另一路径通过 EL4543 进行视频编码并输出至下一台显示终端完成视频级联方案。
此外， 显示装置还可以包括：
功率放大器 56, 用于将本级音频驱动信号通过功率放大处理后进 行音频输出。
对于音频信号而言， 本级显示装置根据信号控制器发出的差分音 频信号， 通过隔离变压器进行处理得到非差分的音频信号的路径， 可 以进一步通过功率放大器 TDA7496处理非差分的音频信号并进行音频 输出。
分频器 55输出的音视频输出信号可以通过第一隔离变压器 522反 馈至信号控制器。
具体地， 对于第一级显示装置而言， 分频器 TSUMV39LU输出的 音视频输出信号可以通过音频信号接收端反馈至信号控制器， 对于其 余各级显示装置而言， 由于并非与信号控制器直接相连， 反馈信号可 以通过音频信号接收端向前一级显示装置逐级反馈， 最终输入信号控 制器。 这样一来， 当每一台显示装置的本地信号或连接状态存在异常 时， TSUMV39LU 无输出信号输出， 该信号通过音频信号接收端返回 到信号控制端， 以便主机能够及时地监控每一台显示装置是否正常工 作， 从而为故障的检测以及后续的维修提供了准确的信息。
需要说明的是， 在本发明实施例中， 各种功能芯片均只是举例说 明， 根据电路功能， 本领域技术人员同样可以想到采用其他具有相同 或相似功能的芯片或逻辑电路， 本发明对此并不做限制。
如图 7 所示， 本发明实施例提供的显示装置级联系统可包括： 信 号控制器 71和多个如上所述的显示装置 72。
显示装置 72的结构已在前述实施例中做了详细的描述， 此处不再 赘述。
在如图 7所示的显示装置级联系统中， 是以一节车厢设置有 1 个 信号控制器 71和 4台显示装置为例进行的说明。 可以看到， 信号控制 器 71直接与第一级显示装置 721相连接， 第一级显示装置 721向下一 级显示装置 722 输出驱动信号， 以此类推实现各级显示装置的级联。 在实际应用的过程中， 信号控制器 1 1与显示终端 121之间网线的线长 通常为 20m, 每两台显示终端分隔 10m均匀排列。 当具有 4台显示装 置时， 显示装置级联系统的总线长约为 50m, 与现有技术相比， 可以 使得每节车厢节省约 90m的连接线。
需要说明的是， 在本发明实施例中， 信号控制器 71和多个显示装 置 72之间可以通过网线进行信号传输， 或者信号控制器 71 和多个显 示装置 72之间还可以通过专用视频图像阵列 （VGA )信号线进行信号 传输。 其不同之处在于， 采用专用 VGA信号线进行音视频信号的传输 可以进一步提高信号的传输效率， 但专用 VGA信号线的成本相对高于 网线， 且线材较粗较硬， 施工布线具有一定难度， 此外专用 VGA信号 线的传输距离有限制， 难以实现显示装置 72的逻辑电平反馈至信号控 制器 71。
本发明实施例的显示装置级联系统， 包括信号控制器和多个显示 装置， 通过采用级联的方式， 每一级显示装置接收信号控制器发送的 音视频信号， 根据接收到的音视频信号得到用于驱动本级显示装置音 视频输出的信号的同时， 还可以将音视频信号通过增益放大输出至下 一级显示装置， 实现本级显示装置与下一级显示装置之间音视频的同 步输出。 这样一来， 除了第一级显示装置， 其余各级显示装置的驱动 信号均来自于与其相级联的上一级显示装置， 从而避免了信号控制器 与各个显示装置的分别连接， 大大减少了逻辑线长， 显著降低了信号 控制器与显示终端之间的布线难度及网线设置的成本。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部 分步骤可以通过程序指令相关的硬件来完成， 前述的程序可以存储于 一计算机可读取存储介质中， 该程序在执行时， 执行包括上述方法实 施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等 各种可以存储程序代码的介质。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并 不局限于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范 围内， 可轻易想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应以所述权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种多终端同步显示方法， 包括：
接收音视频信号；
根据接收到的所述音视频信号得到本级驱动信号， 所述本级驱动 信号用于驱动本级显示装置音视频输出；
将所述本级驱动信号还原为所述音视频信号；
将还原的所述音视频信号输入下一级显示装置， 以使得所述本级 显示装置与所述下一级显示装置音视频同步输出。
2、 根据权利要求 1所述的多终端同步显示方法， 其中， 除第一级 显示装置接收信号控制器发送的音视频信号外， 其余各级显示装置均 接收其上一级显示装置输出的音视频信号。
3、 根据权利要求 2所述的多终端同步显示方法， 其中， 所述方法 还包括：
将所述本级显示装置音视频输出信号反馈至所述信号控制器。
4、 根据权利要求 1 -3任一所述的多终端同步显示方法， 其中， 所 述根据接收到的所述音视频信号得到本级驱动信号包括：
将接收到的视频信号通过解码处理得到本级视频驱动信号； 和 将接收到的音频信号通过隔离变压得到本级音频驱动信号。
5、 根据权利要求 4所述的多终端同步显示方法， 其中， 将所述本 级驱动信号还原为所述音视频信号包括：
将所述本级视频驱动信号通过编码处理还原为所述视频信号； 和 将所述本级音频驱动信号通过运算放大及隔离变压处理还原为所 述音频信号。
6、 根据权利要求 4所述的多终端同步显示方法， 其中， 所述方法 还包括：
根据所述本级视频驱动信号得到用于显示的低压差分信号； 和 将所述本级音频驱动信号通过功率放大处理后进行音频输出。
7、 一种显示装置， 包括：
接收单元， 用于接收音视频信号；
处理单元， 用于根据接收到的所述音视频信号得到本级驱动信号， 所述本级驱动信号用于驱动本级显示装置音视频输出， 所述处理单元 还用于将所述本级驱动信号还原为所述音视频信号；
输出单元， 用于将还原的所述音视频信号输入下一级显示装置， 以使得所述本级显示装置与所述下一级显示装置音视频同步输出。
8、 根据权利要求 7所述的显示装置， 其中， 第一级显示装置的接 收单元用于接收信号控制器发送的音视频信号， 其余各级显示装置的 接收单元均用于接收其上一级显示装置输出的音视频信号。
9、根据权利要求 8所述的显示装置， 其中， 所述显示装置还包括： 反馈模块， 用于将所述本级显示装置音视频输出信号反馈至所述 信号控制器。
10、 根据权利要求 7-9任一所述的显示装置， 其中， 所述处理单元 包括：
解码器， 用于将接收到的视频信号通过解码处理得到本级视频驱 动信号； 和
第一隔离变压器， 用于将接收到的音频信号通过隔离变压得到本 级音频驱动信号。
1 1、 根据权利要求 10所述的显示装置， 其中， 所述处理单元还包 括：
编码器， 用于将所述本级视频驱动信号通过编码处理还原为所述 视频信号； 和
运算放大器及第二隔离变压器， 用于将所述本级音频驱动信号通 过运算放大及隔离变压处理还原为所述音频信号。
12、 根据权利要求 10所述的显示装置， 其中， 所述显示装置还包 括：
分频器， 用于根据所述本级视频驱动信号得到用于显示的低压差 分信号； 和
功率放大器， 用于将所述本级音频驱动信号通过功率放大处理后 进行音频输出。
13、 根据权利要求 12所述的显示装置， 其中， 所述分频器输出的 音视频输出信号通过所述第一隔离变压器反馈至所述信号控制器。
14、 一种显示装置级联系统， 包括： 信号控制器和多个如权利要 求 7-13任一所述的显示装置。
15、 根据权利要求 14所述的显示装置级联系统， 其中， 所述信号 控制器和多个所述显示装置之间通过网线进行信号传输。
16、 根据权利要求 14所述的显示装置级联系统， 其中， 所述信号 控制器和多个所述显示装置之间通过专用视频图像阵列信号线进行信 号传输。
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