WO2022134560A1 - Procédés de transmission et de réception de données pour écran d'affichage et cartes d'envoi et réception d'écran d'affichage - Google Patents

Procédés de transmission et de réception de données pour écran d'affichage et cartes d'envoi et réception d'écran d'affichage Download PDF

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Publication number
WO2022134560A1
WO2022134560A1 PCT/CN2021/107287 CN2021107287W WO2022134560A1 WO 2022134560 A1 WO2022134560 A1 WO 2022134560A1 CN 2021107287 W CN2021107287 W CN 2021107287W WO 2022134560 A1 WO2022134560 A1 WO 2022134560A1
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Prior art keywords
data
frame
display
receiving
display screen
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PCT/CN2021/107287
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English (en)
Chinese (zh)
Inventor
李永杰
沈凌翔
黄斌
聂宗福
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深圳市洲明科技股份有限公司
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Publication of WO2022134560A1 publication Critical patent/WO2022134560A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to the field of display screens, in particular to a data transmission method, a data reception method, a sending card and a receiving card of a display screen.
  • the resolution of the existing LED display is getting higher and higher.
  • the amount of data that needs to be transmitted and processed when the corresponding LED display screen displays data is also increasing. This puts forward high requirements for the data transmission speed of the LED display screen during data display.
  • the existing data transmission methods of LED displays are still not well suited for high-efficiency data transmission in high-resolution scenarios.
  • One aspect of the present application provides a data transmission method for a display screen, including the steps of: receiving video source data, and determining display data of the display screen according to the video source data; receiving control data and query data of the display screen; The display data, control data and query data are respectively transmitted to the receiving card in parallel through independent data transmission channels.
  • Another aspect of the present application provides a data receiving method for a display screen, comprising the steps of: receiving display data, control data and query data sent by a sending card in parallel through independent data transmission channels respectively; operate.
  • Another aspect of the present application provides a sending card for a display screen, including a first memory and a first processor, where a first computer program is stored in the first memory, and the first processor implements the above when executing the first computer program Various steps in a data transmission method of a display screen.
  • FIG. 1 is a flow chart of steps of a data transmission method for a display screen according to an embodiment of the present invention
  • FIG. 2 is a flow chart of steps of a method for receiving data on a display screen according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a sending card of a display terminal according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a receiving card of a display screen according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a data transmission system for a display screen according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a control system for a display screen according to Embodiment 1 of the present invention.
  • FIG. 7 is a schematic structural diagram of a sending card according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of memory access performed by a sending card according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a receiving card according to an embodiment of the present invention.
  • FIG. 10 is a flowchart of processing a received data frame by a receiving card according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a control system for a display screen according to Embodiment 2 of the present invention.
  • FIG. 12 is a corresponding schematic diagram of a display module and a receiving card according to an embodiment of the present invention.
  • FIG. 13 is a flowchart of interaction between a sending card and a receiving card according to an embodiment of the present invention.
  • FIG. 14 is a flow chart of implementing feedback between a sending card and a receiving card according to an embodiment of the present invention
  • Aurora It is a scalable lightweight link layer protocol for moving data between point-to-point serial links. This provides a transparent interface to the physical layer, making it easy to use high-speed transceivers on top of proprietary or industry-standard protocols. While using very little logic resources, Aurora offers low latency, high bandwidth and a highly configurable feature set. It is free to use on Xilinx FPGAs and can be supported on ASICs through a separate license agreement at a nominal cost;
  • Xilinx FPGA Programmable logic device supplier Xilinx
  • ASIC dedicated device
  • IP intellectual property
  • AXI a bus protocol
  • Aurora IP intellectual property rights of the Aurora protocol
  • Aurora Tx Aurora sending module
  • Aurora Rx Aurora receiving module
  • AXIstream AXI bus stream transmission
  • 64B66B Aurora encoding bits (input 64bit, output 66bit);
  • CRC Cyclic Redundancy Check
  • System Control System control.
  • a data transmission method of a display screen comprising the steps:
  • the display data, control data and query data are respectively transmitted to the receiving card in parallel through independent data transmission channels.
  • the beneficial effect of the present invention is that the data transmitted by the display screen is divided into display data, control data and query data through the sending card, and the three kinds of data are respectively transmitted to the receiving card through independent data transmission channels in parallel,
  • the transmission efficiency of video data inside the display control system is improved, which is very suitable for transmitting video data with high color depth, high frame rate and high resolution, and improves the input, Output bandwidth, so that the carrying capacity of a single receiving card is enhanced, and the number of required receiving cards will be reduced, thereby reducing the number of receiving cards in the control system and reducing system costs and risks.
  • the parallel transmission of the display data, control data and query data to the receiving card through independent data transmission channels includes:
  • the display data, control data and query data are respectively transmitted to the receiving card in parallel through independent data transmission channels based on the Aurora protocol.
  • the data transmission based on the Aurora protocol further improves the data transmission rate, and the data transmission rate can reach the nominal speed of Serdes.
  • the display data is transmitted through the USER-DATA channel of the Aurora IP core;
  • the control data is transmitted through the UFC channel of the Aurora IP core;
  • the query data is transmitted through the USER-K channel of the Aurora IP core.
  • the receiving card is in one-to-one correspondence with the display modules of the preset number of blocks divided into the display screen;
  • the receiving cards corresponding to the display modules in the same column on the display screen are connected in series.
  • the receiving cards corresponding to the display modules one-to-one are set according to the display modules of the preset number of blocks divided by the display screen, and the receiving cards corresponding to the display modules belonging to the same column are connected in series.
  • High-resolution video segmentation and grouped parallel display further improve data transmission efficiency.
  • the determining the display data of the display screen according to the video source data includes:
  • the display data is read from the first FIFO based on the AXI protocol, and the read display data is written into the memory through a burst transfer mode.
  • the sending card receives the data read request, and reads the display data from the memory in a burst transmission mode based on the AXI protocol;
  • the sending card saves the read display data in the second FIFO and synchronizes it;
  • the sending card divides and synchronizes the synchronized display data according to the preset number of blocks.
  • the synchronous writing and synchronous reading of data are realized by means of the FIFO and AXI protocols, which ensures the orderliness and robustness of data transmission.
  • the sending card determines the horizontal and vertical synchronization signals of the display screen according to the video source data
  • the sending card synchronizes the display data transmitted by the receiving cards in different columns according to the line-field synchronization signal.
  • the video source data also includes the line and field synchronization signals of the display screen.
  • the line and field synchronization signals By analyzing the line and field synchronization signals, it can be realized that in the process of dividing the video and grouping and displaying it in parallel, the display modules of different columns are separated. The synchronization of the display ensures the reliability of the video display.
  • the sending card forms the display data, the control data and the inquiry data into the display frame, the control frame and the inquiry frame respectively according to the preset frame format;
  • the sending card transmits the display frame, the control frame and the query frame to the receiving card in parallel through independent data transmission channels based on the Aurora protocol.
  • the display data, control data and query data are grouped into frames to form a display frame, a control frame and a query frame, which can ensure the orderly data transmission between the sending card and the receiving card. Efficiently.
  • the display frame includes a field sync frame and a video frame
  • the corresponding operations performed by the receiving card according to the type of the received data include:
  • the receiving card determines the type of the received data, and if it is a field synchronization frame, generates a field synchronization signal according to the field synchronization frame to realize synchronous transmission of data, and transparently transmits the field synchronization frame based on the Aurora protocol;
  • control frame or an inquiry frame detect whether the receiving device identifier carried in the control frame or inquiry frame is the identifier of the receiving card; if it is the identifier of the receiving card, determine whether the control frame or inquiry frame carries data , if it is carried, the data is cached in RAM, if not carried, the corresponding parameters are extracted from the control frame or query frame; if it is not the identifier of the receiving card, the control frame or query frame is based on Aurora protocol for transparent transmission;
  • the receiving card transmits the field sync frame, video frame, control frame and query frame in parallel through independent data transmission channels respectively.
  • the receiving card determines the corresponding frame type based on the different frame formats of the received data frame, so as to perform corresponding data processing. At the same time of data processing, it will pass the received data frames of various types based on the Aurora protocol. Parallel transmission of independent data channels ensures the effectiveness and efficiency of data transmission.
  • the sending card receives, in real time, a feedback signal for the display frame, control frame or query frame sent by the receiving card.
  • the real-time return monitoring of the display video is realized by the receiving card feeding back signals for display frames, control frames or query frames.
  • the sending card sends a connection status query frame to the receiving card
  • the receiving card sends a query feedback frame containing the connection status of the forward and feedback data transmission channels to the sending card;
  • the sending card determines the total number of channels according to the query feedback frame sent by the receiving card.
  • the number of serial channel connections can be detected by sending the connection status query frame, thereby realizing automatic identification of the number of channels.
  • the feedback signals for the display data, control data or query data sent by the receiving card are respectively transmitted to the sending card in parallel through independent data transmission channels based on the Aurora protocol;
  • the data transmission channel used by the receiving card and the data transmission channel used by the sending card are independent of each other.
  • the receiving card performs a CRC check on the data transmitted on the data transmission channel, and if the CRC check result is an error in the data, the CRC check result is fed back to the sending card.
  • the CRC check function is realized by performing CRC check on the data transmitted on the data transmission channel, and the erroneous data is fed back immediately, which further ensures the reliability of data transmission.
  • a data transmission system of a display screen includes a sending card and a receiving card; the sending card includes a first memory and a first processor. A first computer program is stored on the first memory; the receiving card includes a second memory and a second processor. A second computer program is stored on the second memory, and when the first processor executes the first computer program, each step performed by the sending card in the data transmission method for the display screen is implemented;
  • each step performed by the receiving card in the data transmission method for the display screen is implemented.
  • the data transmission method and system for the above-mentioned display screen of the present invention can be applied to the data transmission of any type of LED display screen, and is especially suitable for the data transmission of the display screen with high frame rate, high resolution and high pixel bit width.
  • the implementation is explained:
  • a data transmission method of a display screen comprising the steps:
  • the sending card receives the video source data, and determines the display data of the display screen according to the video source data;
  • the sending card parses the video source data to determine the display data of the display screen
  • the sending card When the sending card receives a data read request, read display data from the memory in a burst transfer mode based on the AXI protocol;
  • the sending card saves the read display data in the second FIFO and synchronizes it;
  • the sending card divides and synchronizes the synchronized display data according to the preset number of blocks
  • the sending card receives control data and query data of the display screen
  • the sending card transmits the display data, control data and query data to the receiving card in parallel through independent data transmission channels respectively;
  • the display data, control data and query data are transmitted to the receiving card in parallel through independent data transmission channels based on the Aurora protocol;
  • the display data is transmitted through the USER-DATA channel of the Aurora IP core;
  • the control data is transmitted through the UFC channel of the Aurora IP core;
  • the query data is transmitted through the USER-K channel of the Aurora IP core;
  • the receiving card performs a corresponding operation according to the type of the received data
  • FIG. 3 shows a schematic structural diagram of a usage scenario of the present embodiment.
  • the control system for realizing data transmission on the display screen includes two parts, a display sending processing unit and a display receiving processing unit.
  • the display sending processing unit is mainly used for receiving external video sources (including horizontal and vertical signals), sending display/control/query data to the display receiving processing unit, and receiving display feedback/control feedback/query feedback data from the display receiving processing unit.
  • processing unit ;
  • the display sending processing unit includes a sending card
  • the display receiving processing unit includes a receiving card
  • FIG. 4 is a schematic structural diagram of the sending card, and its specific workflow is as follows:
  • the 8K video source is input to the sending card through the HDMI2.1 protocol interface, the sending card parses the video data, the video signal is input to the video source input module, and then input to the sending card memory (DDR3/DDR4) through the memory access module.
  • the write data first enters the FIFO module to complete data buffering, synchronization and data bit width conversion, and then the AXI Write module writes the data into the memory through the write burst transfer mode; when the data needs to be read from the memory, the AXI Read module reads from the memory. In the memory, the data is read from the memory through the read burst transfer mode, and then enters the FIFO to complete the data buffering and synchronization, and finally obtain the read data.
  • the data bit width conversion that FIFO needs to complete here is 24 to 64 bits, and the data bit width conversion is not required for reading data, because the subsequent transmission
  • the data bit width of the module, especially the single channel of Aurora IP is 64bit, so there is no need for data bit width conversion here; among them, AXI Write and AXI Read are connected to the memory application interface through the AXI multiplexing module at the same time;
  • the sending card forms the display data, the control data and the query data into a display frame, a control frame and a query frame respectively according to a preset frame format
  • the sending card transmits the display frame, the control frame and the query frame to the receiving card in parallel through an independent data transmission channel based on the Aurora protocol;
  • the display frame includes a field sync frame and a video frame
  • the corresponding operations performed by the receiving card according to the type of the received data include:
  • the receiving card determines the type of the received data, and if it is a field synchronization frame, generates a field synchronization signal according to the field synchronization frame to realize synchronous transmission of data, and transparently transmits the field synchronization frame based on the Aurora protocol;
  • control frame or an inquiry frame detect whether the receiving device identifier carried in the control frame or inquiry frame is the identifier of the receiving card; if it is the identifier of the receiving card, determine whether the control frame or inquiry frame carries data , if it is carried, the data is cached in RAM, if not carried, the corresponding parameters are extracted from the control frame or query frame; if it is not the identifier of the receiving card, the control frame or query frame is based on Aurora protocol for transparent transmission;
  • the receiving card transmits the field synchronization frame, the video frame, the control frame and the query frame in parallel through independent data transmission channels respectively;
  • Each parallel serial channel transmits the frame format data, and the pixel transmission uses the display frame format.
  • the display frame contains two kinds of frames, the field sync frame (frame header 0x00) and the video frame (frame header 0x1), the field sync frame.
  • Sending requires the sending card to receive and parse the 8K line and field synchronization signals, parse the field synchronization signals, and then fill the packets according to the data required by the frame packets to generate the field synchronization frames. Taking 8K as an example, the complete field synchronization frame is filled as shown in Table 1. Show:
  • the video frame also supports 3D mode, but the frame rate will be reduced by half when 3D mode is supported;
  • the video frame needs to be sent.
  • the video frame is line synchronization plus pixel data.
  • the line synchronization is reflected in the synchronization stage of each pixel line.
  • a frame header with a line number is sent first, followed by the data part containing pure pixel data.
  • the 8K example video frames are shown in Table 2:
  • the second line synchronization signal arrives, the second line of frame data is sent in the same video frame format (the line number is switched to 0x01) until the 4320th line of data is sent, so that all 2048*4320 pixel data are sent to the serial line channel;
  • the sending card In addition to sending display frames, the sending card also needs to send control frames and query frames. These frames are initiated and framed by the system function control module of the sending card. This frame can be transmitted one-to-one, so it is necessary to define the sending and receiving device numbers.
  • the serial number is fixed to 0, and the serial number of the receiving card connected to the serial channel is 1.
  • the sending card sends a control frame data 0x0001020304050607 to the receiving card No. 1.
  • the frame format is shown in Table 3:
  • the query frame is also initiated and framed by the function control module of the sending card.
  • This frame can also be transmitted one-to-one. Therefore, it is necessary to define the sending and receiving device numbers.
  • the serial number of the sending card is fixed to 0, and the serial number of the receiving card connected to the serial channel is 1, assuming that the sending card sends a control frame data 0x0010203040506070 to the receiving card No. 1, the frame format is shown in Table 4:
  • this query frame is 0x80; if the control frame contains data, it needs to be grouped in 8Byte units; in addition, we use the USER-K channel of Aurora IP for this control frame, which is physically independent from the data channel of the display frame. Open, but share the bandwidth on the serial channel; thus display frames, control frames, and query frames are all sent to the receiving card via the serial channel.
  • FIG. 6 is a schematic diagram of the structure of the receiving card.
  • Each receiving card fixedly drives the display module of the display screen connected to itself. Therefore, if the video is to be displayed on the LED evaluation, it must be divided into transmission and display.
  • the display screen The size is 2048*4320, divided into one column and four rows, there are four display modules in total, namely 4*1 receiving cards, each display module size is 2048*1080, as shown in Figure 6, three data frames arrive After the receiving card with the column number 1, it first goes through a frame parsing module, and its workflow is shown in Figure 7:
  • the frame parsing module identifies the frame type according to the frame parsing situation:
  • a field synchronization signal is generated for the field synchronization frame and input to the system control module, this signal is used to control the system to synchronously drive the field display of the LED display screen, and at the same time, the field synchronization frame is transmitted to the frame synchronization transmission module for synchronous transmission.
  • Synchronization mainly refers to synchronization. Apply the clock to the Aurora IP module of the receiving card;
  • a line synchronization signal needs to be generated and input to the system control module for synchronously driving the LED display line display; intercept the 2048x1080 display area data displayed by the No. 1 receiving card, and buffer it into the memory, memory read and write and send card The same; provided to the system control module for the LED display screen to refresh and display the image content; at the same time, the video frame was passed to the frame synchronization sending module for transparent transmission to be passed to the No. 2 receiving card;
  • control frame or a query frame first detect the receiving device number. If it is 1, it is sent to the No. 1 receiving card. If the control frame and query frame have data, the data should be cached into the RAM module and the control input will be extracted. The parameters and query parameters are input to the system control module; if the receiving device number is not 1, it will continue to transparently transmit the control frame or query frame to the sending card 2;
  • the receiving card 1 also receives and processes the display frame, control frame and query frame, and the three frames transparently transmitted to the receiving card 2 are also output to the serial channel.
  • the receiving card 2 and the receiving card 1 are completely symmetrical, and the same processing flow is adopted. , so that the three frames are transmitted to the receiving card 3. After the same processing process, they finally reach the receiving card No. 4, and perform the same operation as the receiving card 1; the video data of 2048*4320 is sent by the sending card.
  • the line and field synchronization signal displayed as a sync signal.
  • the receiving card corresponds to the display modules of the preset number of blocks divided into the display screen in one-to-one correspondence
  • the receiving cards corresponding to the display modules in the same column on the display screen are connected in series;
  • the sending card determines the horizontal and vertical synchronization signals of the display screen according to the video source data
  • the sending card synchronizes the display data transmitted by the receiving cards in different columns according to the line-field synchronization signal.
  • the display receiving processing unit includes: n groups of receiving cards, the receiving cards are connected in groups, and each group is a serial connection; between the sending card and the receiving card, and between the receiving card and the receiving card are composed of n serial channels, the data transmitted by the serial channel is The sum of display data, control data, and query data in Figure 3; a serial channel corresponds to a Serdes channel, which is an independent duplex transmission with sending and receiving channels at the same time, and Serdes are in a non-bonding state, that is, non-binding state, there are n*n receiving cards in the figure.
  • the control system includes 1 sending card, 4x4 receiving cards, the number of serial channels of a single group of receiving cards is 4; the rate of a single serial channel is 6.5Gbps; the total transmission rate of the system is 4.
  • the schematic diagram of video segmentation display is shown in Figure 9. After segmentation, 4 groups of pixels pass through 4 groups of receiving cards, and then each group of pixels is sent to the first receiving card through 4 serial channels; It is not used in parallel, but used alone, so they need to be synchronized with each other.
  • FIFO is selected to complete the synchronization and data bit width conversion function; here is the data bit width of 64 to 64*4; after the conversion is completed, the synchronization enters the framing transmission module.
  • serial receiving cards There are 4 groups of such serial receiving cards in Figure 9, and the total number of display pixels is 2048*4320.
  • the second group displays the second group of 2048*4320 pixel data in Figure 9, and the third group displays the third group of 2048 in Figure 9. *4320 pixel data, the fourth group displays the fourth group of 2048*4320 pixel data in Figure 95; a complete 8K image is displayed on the LED display at a frame rate of 120fps; and these four groups of serial receiving cards are all in
  • the field signal sent by the sending card is used as a synchronization signal; each of the above-mentioned groups of serial receiving cards adopts the same method as the first embodiment to realize the transmission between the sending card and the receiving card, and between the receiving card and the receiving card;
  • Figure 10 shows the work flow between the sending card and the receiving card.
  • the total effective data transmitted in 1s is 8192*4320*48*120bit, where 8192 is the total number of line pixels, 4320 is the total number of column pixels, 48 is the number of RGB pixel bits, and 120 is the frame rate.
  • the video frame contains 12Byte frame header, 4320*120 in 1s, field sync frame is also 12Byte, 120 in 1s, so the effective data transmission rate is:
  • the frame design adopted in this embodiment can make the transmission efficiency utilization rate of Aurora reach 99.97%.
  • Embodiment 1 or Embodiment 2 The difference between this embodiment and Embodiment 1 or Embodiment 2 is that it also includes steps:
  • the sending card receives, in real time, a feedback signal for the display frame, control frame or query frame sent by the receiving card;
  • the feedback signals for the display data, control data or query data sent by the receiving card are respectively transmitted to the sending card in parallel through independent data transmission channels based on the Aurora protocol;
  • the data transmission channel used by the receiving card is independent of the data transmission channel used by the sending card
  • the sending card sends a connection status query frame to the receiving card
  • the receiving card sends a query feedback frame containing the connection status of the forward and feedback data transmission channels to the sending card;
  • the sending card determines the total number of channels according to the query feedback frame sent by the receiving card
  • it also includes:
  • the receiving card performs a CRC check on the data transmitted on the data transmission channel, and if the CRC check result is an error in the data, the CRC check result is fed back to the sending card.
  • this embodiment uses an independent, but the same Aurora IP and configuration, and also supports display frames, control feedback frames, and query feedback frames.
  • the receiving card 1 receives the control frame sent by the sending card (such as Table 3)
  • the receiving card system control module generates a control feedback frame according to the control frame of the sending card, if the No. 1 receiving card is fed back to the sending card, its frame is shown in Table 5:
  • this control frame feedback frame is 0x09.
  • the sending device number becomes 0x01 of the No. 1 receiving card
  • the receiving device number is the card number 0x00 of the sending card.
  • the data is assumed to be 0x0010203040506070.
  • the control feedback frame has similar video frame pixel data, it is grouped in units of 8Bytes.
  • this control frame feedback frame also goes through the UFC channel of Aurora IP, but note that the serial channel is an independent duplex channel, so the feedback frame goes through the feedback Aurora IP channel.
  • the query frame and control frame are processed in the same way, and the query frame feedback frame and control feedback frame are processed in the same way.
  • the sending card first sends a control frame (Table 3) to the last card of each group of receiving cards (the receiving device number is 0x04)
  • the No. 4 receiving card takes the horizontal and vertical synchronization signals obtained from the forward serial channel by the system control module as the horizontal and vertical synchronization signals for sending feedback video, and stores the 2048 horizontal and vertical synchronization signals in its memory.
  • the display frames include field sync frames and video frames, which are sent to the No. 3 receiving card through the feedback serial channel, and the No. 3 receiving card will also do after receiving the feedback display frame.
  • the 2048*1080 pixel frame in its own memory is sent to the No. 2 receiving card through the feedback serial channel, and the display feedback frame data sent by the No. 4 receiving card is transparently transmitted, and the No. 2 receiving card receives the feedback display.
  • the No. 1 receiving card will do the same process to send the 2048*1080 pixel frame in its own memory to the No. 1 receiving card through the feedback serial channel, and transparently transmit the No. 2 receiving card and No. 3 receiving card.
  • the display feedback frame data sent by the receiving card and the No. 4 receiving card is sent to the sending card, and the sending card collects the pixel data of each receiving card and displays it in a summary to form a real-time LED display display feedback.
  • the process is shown in Figure 11;
  • This embodiment also supports channel number detection.
  • the specific implementation of the channel number detection module is shown in Figure 12: after the system is powered on, the sending card will first send the receiving card connection status query frame (Table 4) to each group of serial receiving cards; After the power is turned on, after the physical connection of the serial channel is established, the Serdes channel used by the Aurora IP will feedback the channel connection status to the Aurora IP, the duplex channel (Tx and Rx) will feedback signals separately, and the channel preparation module will collect and detect the two. A signal is generated, and the connection status of each channel is generated and reported to the system control module. No. 1-4 receiving cards will collect this information and report it. Note that the receiving card needs to transmit the serial channel connection status in both forward and feedback directions. After receiving the connection status query frame sent by the sending card, each sends a query feedback frame to the send card;
  • Aurora IP also supports the CRC check of the data channel (which we use here to transmit the display frame).
  • the CRC check signal will be output to the system control module.
  • the system control module will re-receive the video frame and update the display data. If the CRC check error occurs for many times or for a long time, the relevant receiving card will generate a query feedback frame to transmit the CRC error information to the sending card;
  • Aurora is divided into 8B10B and 64B66B, and 64B66B is used in the embodiment of the present invention.
  • a data transmission system 7 of a display screen includes a sending card 1 and a receiving card 4;
  • the sending card 1 includes a first memory 2 and a first processor 3, and the first memory 2 stores a first computer program that can run on the first processor 3;
  • the receiving card 4 includes a second memory 5 and a second processor 6, and the second memory 5 stores a second computer program that can run on the second processor 6;
  • each step performed by the receiving card 4 in the data transmission method for a display screen described in any one of Embodiments 1 to 3 is implemented.
  • the present invention provides a data transmission method, a data receiving method, a sending card and a receiving card for a display screen.
  • the data transmitted by the display screen is divided into display data, control data and query data through the sending card, and the data is divided into display data, control data and query data.
  • the three kinds of data are transmitted to the receiving card in parallel through the independent USER-DATA/UFC/USER-K channel based on the Aurora protocol.
  • the data is divided and transmitted in parallel based on the Aurora protocol, which improves the transmission efficiency of video data in the display control system.
  • the automatic identification function can further improve the data transmission efficiency by dividing the video, grouping the parallel synchronous display and the corresponding connection between the sending card and the receiving card.
  • the range is 3.25Gbps to 6.5Gbps.
  • the number of lines can be 4 to 8 to meet the cascade transmission of 4K and 8K LED control systems. This design can be used in the case of achieving a high frame rate of 120fps.
  • Multi-channel connection lines here we use non-bonding, so in theory, it can be arbitrarily multi-channel
  • if low-cost FPGA is used multi-channel connection lines can also be used to reduce costs; the system transmits high speed and low latency to make video Strict synchronization of transmissions is achieved.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention divulgue des procédés de transmission et de réception de données pour un écran d'affichage et des cartes d'envoi et de réception de l'écran d'affichage. La carte d'envoi reçoit des données sources vidéo et détermine des données d'affichage de l'écran d'affichage selon les données sources vidéo ; la carte d'envoi reçoit des données de commande et des données d'interrogation de l'écran d'affichage ; la carte d'envoi transmet en parallèle les données d'affichage, les données de commande et les données d'interrogation à la carte de réception au moyen de canaux de transmission de données indépendants, respectivement ; et la carte de réception exécute une opération correspondante selon le type des données reçues.
PCT/CN2021/107287 2020-12-24 2021-07-20 Procédés de transmission et de réception de données pour écran d'affichage et cartes d'envoi et réception d'écran d'affichage WO2022134560A1 (fr)

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