CN1734545A - LED display screen signal interconnection method - Google Patents
LED display screen signal interconnection method Download PDFInfo
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- CN1734545A CN1734545A CNA2005100356106A CN200510035610A CN1734545A CN 1734545 A CN1734545 A CN 1734545A CN A2005100356106 A CNA2005100356106 A CN A2005100356106A CN 200510035610 A CN200510035610 A CN 200510035610A CN 1734545 A CN1734545 A CN 1734545A
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Abstract
The invention discloses an interconnecting method of LED display screen signal, which consists of LED display screen controller and several boxes of bus groups and comprises the following steps: a) the LED display screen controller cascades each leading-end bus of bus groups by twisted-pair line; b) several boxes of each box group cascade by twisted-pair line.
Description
Technical field
The invention belongs to LED display control technology field, the particularly signal interconnection method between the LED display casing.
Background technology
Known LED display generally shows the digital video image subregion.For example the LED display that is 1024 * 768 pixels for a resolution in indoor general employing horizontal partition technology, is divided into 1024 * 16 pixels totally 48 row's demonstration subregions, and every row shows that subregion is made of the demonstration module of 16 64 * 16 pixels again; Outdoor LED display generally adopts the casing cutting techniques, can be divided into the demonstration subregion that 16 * 16 box-types distribute by 64 * 48 pixels, and each shows that subregion is made of the demonstration module of 24 16 * 8 pixels.Each demonstration subregion of two kinds of dividing methods all is furnished with a signal scanning plate, is responsible for receiving data and the control signal that led controller distributes, and finishes the reading scan work of subregion separately respectively simultaneously.
As shown in Figure 1, after known LED display controller is handled the data of storage and the control timing that produces together, pass to some scanning boards (1-n) concurrently by bus driver, drive to oriented LED by scanning board again and show that subregion shows.Each scanning board can be supported multichannel subregion (for example 4 tunnel), and some LED that every road subregion is arranged by laterally (also can vertically) show modules polyphone formation.The LED that every road scanning board is supported shows that the connecting mode of module is as seen shown in Figure 2.
Among Fig. 2, LED shows that the resolution of module is indoor and is generally 64 * 32,64 * 16, outdoorly is generally 16 * 8, and its number that shows module is determined by the overall resolution of LED display.The chip for driving of LED often adopt 74HC595 or with the constant current chip of Toshiba's 62726 compatibilities, both are serial at data, required displacement, to latch, turn-off control signal also similar.If dynamic scan also needs the 3-4 line to support 138 decodings.Between scanning board and LED module, LED module and the LED module, in traditional signal connects, all adopt single ended interfaces standards (for example 74HC245) such as TTL, CMOS, with 16-20 core flat cable serial connection, wherein 10 is RGB data and control line, other 10 ground wires for the reduction interference.
The shortcoming of this method of prior art is many with line, for example the on line of LED control panel and each demonstration subregion can reach hundreds of, transmission frequency low (＜5MHz), transmission range is short, be subject to disturb, signal easily distorts when transmission signals, and for example pulsewidth narrows down, and causes asynchronous film flicker of signal or generation front and back aberration phenomenon etc.This method be used in monochrome or the four looks screen still can, be used in the high-quality all-colour LED screen, no matter on bandwidth, speed and anti-interference problem, all can not meet the demands.In order to satisfy requirement such as speed, coaxial cable and the Optical Fiber Transmission mode of adopting also arranged between LED display controller and casing, casing and the casing, but technology that these two kinds of transmission modes adopt and structure be comparatively complicated, cost is all higher, and it is also not too convenient to install.
Because in traditional design, led controller and show between the subregion, the transmission of data and control signal is adopted between casing and the casing is the connecting mode of direct bus driver and flat cable, thereby its transmission frequency is low, signal easily distorts, also more with line, cause structure complicated, and signal quality is relatively poor.
Therefore, there is defective in prior art, and awaits improving and development.
Summary of the invention
The object of the present invention is to provide a kind of LED display signal interconnection method, adopt advanced high speed LVDS serial communication and FPGA technology, in casing distribution type LED display screen, led controller and front end casing, casing and casing are by the mutual cascade of a pair of twisted-pair feeder, guarantee the stability of transmission signals, and syndeton is simple.
Technical scheme of the present invention is as follows:
A kind of LED display signal interconnection method, described LED display comprise LED display controller and many group casings, and every group of casing includes a plurality of casings, wherein, said method comprising the steps of:
A), the front end casing of described LED display controller and every group of casing is by the twisted-pair feeder cascade;
B), pass through the twisted-pair feeder cascade between a plurality of casings of described every group of casing.
Described method, wherein, its system comprises a primary scene programmable gate array, and in this primary scene programmable gate array, be used for connecting a plurality of LED casings of driving; Said method comprising the steps of:
A), a secondary scene programmable gate array is set in a LED reading scan plate, the differential received of this LED reading scan plate is responsible for receiving the low-voltage differential signal video data that upper level casing or led controller transmit, and difference output is responsible for the low-voltage differential signal video data that the upper level casing transmits renewed and is passed to the next stage casing;
B), described casing is by the twisted-pair feeder cascade, described low-voltage differential signal transmission drives and is connected by twisted-pair feeder with the first casing of each row or row.
Described method, wherein, described method also is provided with the setting that dial is used for each casing number and wire size.
Described method, wherein, described primary scene programmable gate array is supported low-voltage differential signal transmission communication interface, is responsible for receiving main frame and passes the video data of coming by optical fiber or kilomega network, passes to each LED by low-voltage differential signal transmission serial link more after treatment and shows casing.
Described method, wherein, described method also adopts serializer/deserializers in the high-speed serial interconnect technology, 8B/10B coding and clock from recovery technology.
Described method, wherein, described twisted-pair feeder is single to non-Category-5 twisted pair.
A kind of LED display signal interconnection method provided by the present invention, owing to adopt a pair of twisted-pair feeder to the connecting mode between casing and the casing, simplified syndeton, and the transmission stability of assurance signal, for resolution is the LED display of 1024 * 768 pixels, and led controller only can be respectively links with first casings of 16 display channels with 16 pairs of twisted-pair feeders.Each display channel has 16 LED casings, also only adopts the cascade in twos of a pair of twisted-pair feeder between each casing, is the interconnected method of signal between a kind of casing of LED display efficiently therefore.
Description of drawings
Below in conjunction with accompanying drawing the present invention is done detailed explanation.
Fig. 1 is the synoptic diagram that the LED display subregion of prior art shows;
Fig. 2 is that the single scanning subregion of the LED display of prior art shows the formation synoptic diagram;
Fig. 3 is that the LED display casing subregion of the inventive method shows the formation synoptic diagram;
Fig. 4 is the topological structure of the serial LVDS communication link of the inventive method;
Fig. 5 laterally is connected in series synoptic diagram for 4 * 4 pairs of each casings of twisted-pair feeder of the inventive method;
Fig. 6 vertically is connected in series synoptic diagram for 4 * 4 pairs of each casings of twisted-pair feeder of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, will carry out comparatively detailed explanation to each preferred embodiment of the present invention.
LVDS (Low Voltage Differential Signaling, the low-voltage differential signal transmission) be a kind of little difference of vibration sub-signal technology, it uses low-down range signal (100mv-450mv), by the PCB cabling or the balanced cable transmission data of pair of parallel.This transmission standard adopts constant current two line differential driving patterns, and anti-common-mode noise interference performance is strong, and electromagnetic radiation is little, can not produce ring and signal and switch the spiking that brings, and has good EMI (anti-electromagnetic interference (EMI)) characteristic.Also have advantages such as data reversal is fast, low in energy consumption.Adopt this technology, as long as guarantee that the length of ribbon feeder is enough consistent, and provide good impedance matching to reduce signal reflex at receiving end, a pair of line just can be brought up to the transfer rate of data more than the 800MHz, transmission range is then successively decreased with the increase of frequency, can reach tens meters to tens centimetres.Because LVDS has these good characteristics, makes that its application is more and more universal.Particularly in the high-speed serial data communication between device and device, device and plate level, plate level and plate level, as first-selected standard.At present, LVDS sort signal standard is all supported in the input and output of the FPGA device of company such as Altera, Xilinx.
Provided coupling method between a kind of LED display controller of designing in the inventive method and casing, casing and casing as shown in Figure 3, among the embodiment as shown in Figure 3, adopt the overall resolution of the LED display of box typed structure connection to be designed to 1024 * 768, the design resolution of each casing is 64 * 48, like this, laterally, the casing number average vertically arranged is 16, total casing number is 256.Led controller links to each other with the initial casing in 16 LED show case districts by 16 pairs of twisted-pair feeders (as non-Category-5 twisted pair).Each show case district by 16 laterally (vertically also can) LED casing of arranging forms, adopt a pair of twisted-pair feeder continuous in twos between each casing.
The topological structure of the hardware principle of LVDS communication scheme and 16 road 270MHz serial LVDS communication links is seen shown in Figure 4ly between LED screen casing, and each casing is furnished with an independently LED reading scan plate, is responsible for the full-color demonstration of this casing 64 * 48 pixel RGB by it.The differential received of scanning board is responsible for receiving the LVDS video data that upper level casing or led controller transmit, and difference output is responsible for the LVDS video data that the upper level casing transmits renewed and is passed to the next stage casing.Communication distance between led controller and casing can reach 10M, and the communication distance of casing and casing is generally less than 2M.Low 4 settings that are used for each casing number (0-15) of 8 dials among the figure.The core of scanning board is the on-site programmable gate array FPGA chip that a slice has LVDS communication interface and certain capacity storage body, it is secondary scene programmable gate array, it is responsible for reception, the relaying of LVDS video data bus, finishes the holding back of this casing data, storage, conversion and gray scale scanning output.The hardware design of master control borad has adopted a slice to support the FPGA of LVDS communication interface equally, it is the primary scene programmable gate array, it is responsible for receiving main frame and passes the video data of coming by optical fiber or kilomega network, passes to each LED show case district by 16 road LVDS serial links more after treatment.
In order to guarantee the system reliability of serial LVDS communication link, adopted SerDes (serializer/deserializers), 8B/10B coding advanced in the current high-speed serial interconnect technology and clock in the design of the inventive method from recovering the CDR technology.SerDes solves be 32/16/8 bit data and string, string and transfer problem, the inventive method is inner, and what adopt is 32 buses, each 8 of RGB add 8 control bytes.At transmitting terminal, these 4 byte timesharing enter 8 bit parallel buses successively, are converted to after one tunnel serial data in the receiving end recovery of unstringing successively again.As shown in Figure 4, each shows that the resolution of subregion is 1024 * 48, and according to calculating, the transfer rate of 8 required bit parallel data should be greater than 12.5MHz, should be greater than 125MHz behind the 8B/10B serial code.Native system adopts the parallel transmission speed of 27MHz, i.e. the serial transmission speed of 270MHz, and the resolution of support can surpass 2048 * 48, be enough to support the transmitting and displaying of any high-definition digital video signal.The present invention has adopted the 8B/10B coding, to obtain better dc balance characteristic, improves the transfer rate of data, reduces error code, and helps obtaining synchronizing signal at receiving end, extracting clock etc.CDR has then abandoned a circuit-switched data, the early stage source synchronous clock data transmission structure of one road clock, only use pair of data lines, clock is embedded in the transmission data-signal, automatically recover at receiving end again, thereby overcome the jitter problem of data and clock, improved transfer rate, reduce power consumption, obtained preferable signal integrity.Native system has adopted system clock management and the PLL circuit among the FPGA simultaneously, has solved frequency multiplication effectively, high frequency clock is synchronous and the phase shift problem.
Another important feature of the system high-speed LVDS serial communication of the inventive method is the segmentation intercepting and the synchronous head design of serial data stream.Because of the serial data flow transmission be the partial data in whole show case district, so each casing in serial data stream, the cabinet number that can set according to 4 dials obtain required data separately.The synchronous head design can be adopted general video transmission standard, also can design voluntarily.The present invention has adopted the method for regularly inserting special byte, has obtained good effect, and has guaranteed reliability of data transmission.
Because the speed of LVDS serial communication is up to 270MHz, the data resolution that every road LVDS link is supported can surpass 2048 * 48, so the connection of casing can be supported multiple connecting mode.
Be another kind of embodiment of the present invention as shown in Figure 5, master control borad adopts 4 RJ45 heads, and each RJ45 head connects 4 pairs of twisted-pair feeders, connects the synoptic diagram of 16 * 16 casings (1024 * 768 resolution).Each casing is laterally contacted, and vertically intersects continuous the company, and promptly 4 pairs of non-Category-5 twisted pairs are supported 4 row's casings, and the single casing among every row adopts 4 dials to select case number (CN), and other increases by 4 dial and selects wire size.
Be an embodiment more of the present invention as shown in Figure 6, each casing is vertically contacted, the continuous synoptic diagram that connects of lateral cross, and the single casing in every row also adopts 4 dials to select case number (CN), and other increases by 4 dial and selects wire size.
The inventive method can be applicable to the signal connecting mode of led controller and each demonstration subregion in the LED display of cutting apart in indoor laterally (or vertically) of non-body structure simultaneously.
The inventive method compared with prior art, adopted advanced high speed LVDS serial communication and SerDes, 8B/10B coding and clock from recovering the CDR technology, and adopt the low list of the design of practical and reliable serial synchronous head, cost to non-Category-5 twisted pair LED screen body interconnection technique and brick pattern casing mutual contact mode flexibly, it is simple in structure, install easily, the reliability height, cost is low.
Should be understood that above-mentioned description at each preferred embodiment of the present invention is comparatively concrete, can not therefore be interpreted as restriction scope of patent protection of the present invention.
Claims (6)
1, a kind of LED display signal interconnection method, described LED display comprise LED display controller and many group casings, and every group of casing includes a plurality of casings, it is characterized in that, said method comprising the steps of:
A), the front end casing of described LED display controller and every group of casing is by the twisted-pair feeder cascade;
B), pass through the twisted-pair feeder cascade between a plurality of casings of described every group of casing.
2, method according to claim 1 is characterized in that, its system comprises a primary scene programmable gate array, and in this primary scene programmable gate array, be used for connecting a plurality of LED casings of driving; Said method comprising the steps of:
A), a secondary scene programmable gate array is set in a LED reading scan plate, the differential received of this LED reading scan plate is responsible for receiving the low-voltage differential signal video data that upper level casing or led controller transmit, and difference output is responsible for the low-voltage differential signal video data that the upper level casing transmits renewed and is passed to the next stage casing;
B), described casing is by the twisted-pair feeder cascade, described low-voltage differential signal transmission drives and is connected by twisted-pair feeder with the first casing of each row or row.
3, method according to claim 1 is characterized in that, described method also is provided with the setting that dial is used for each casing number and wire size.
4, method according to claim 1, it is characterized in that, described primary scene programmable gate array is supported low-voltage differential signal transmission communication interface, be responsible for receiving main frame and pass the video data of coming, pass to each LED by low-voltage differential signal transmission serial link more after treatment and show casing by optical fiber or kilomega network.
5, method according to claim 1 is characterized in that, described method also adopts serializer/deserializers in the high-speed serial interconnect technology, 8B/10B coding and clock from recovery technology.
6, method according to claim 1 is characterized in that, described twisted-pair feeder is single to non-Category-5 twisted pair.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567162B (en) * | 2009-05-27 | 2011-08-03 | 西安诺瓦电子科技有限公司 | System and method for controlling high-resolution LED display screen |
| CN103021329A (en) * | 2012-11-27 | 2013-04-03 | 深圳市奥拓电子股份有限公司 | Light-emitting diode (LED) full color screen system and brightness adjusting method thereof |
| CN104167182A (en) * | 2014-08-27 | 2014-11-26 | 广东威创视讯科技股份有限公司 | Method and system for engineering wiring of LED display system |
| CN104240641A (en) * | 2014-09-15 | 2014-12-24 | 深圳市云智科技有限公司 | LED display screen control method and system |
| CN104537986A (en) * | 2015-01-21 | 2015-04-22 | 杭州士兰微电子股份有限公司 | LED module, control method of LED module, and LED drive circuit |
| CN104952395A (en) * | 2015-06-28 | 2015-09-30 | 包钢 | Control system for LED display screen |
| CN104992672A (en) * | 2015-07-16 | 2015-10-21 | 西安诺瓦电子科技有限公司 | Led lamp panel |
| CN105243968A (en) * | 2015-10-15 | 2016-01-13 | 利亚德光电股份有限公司 | LED (light emitting diode) display, LED television, communication method and communication device |
| CN109011639A (en) * | 2018-08-03 | 2018-12-18 | 合肥爱哆梦教育科技有限公司 | A kind of building blocks and system and method for trained children's lines recognition capability |
| CN109256084A (en) * | 2018-10-29 | 2019-01-22 | 深圳市摩西尔电子有限公司 | It can cascade LED display control card, the cascade control method of realization and HDMI signal processing method |
| CN109413343A (en) * | 2018-10-17 | 2019-03-01 | 黄秀瑜 | A kind of LED video display system |
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- 2005-06-27 CN CNB2005100356106A patent/CN100507997C/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101567162B (en) * | 2009-05-27 | 2011-08-03 | 西安诺瓦电子科技有限公司 | System and method for controlling high-resolution LED display screen |
| CN103021329A (en) * | 2012-11-27 | 2013-04-03 | 深圳市奥拓电子股份有限公司 | Light-emitting diode (LED) full color screen system and brightness adjusting method thereof |
| CN104167182A (en) * | 2014-08-27 | 2014-11-26 | 广东威创视讯科技股份有限公司 | Method and system for engineering wiring of LED display system |
| CN104240641A (en) * | 2014-09-15 | 2014-12-24 | 深圳市云智科技有限公司 | LED display screen control method and system |
| CN104537986A (en) * | 2015-01-21 | 2015-04-22 | 杭州士兰微电子股份有限公司 | LED module, control method of LED module, and LED drive circuit |
| CN104952395A (en) * | 2015-06-28 | 2015-09-30 | 包钢 | Control system for LED display screen |
| CN104992672A (en) * | 2015-07-16 | 2015-10-21 | 西安诺瓦电子科技有限公司 | Led lamp panel |
| CN104992672B (en) * | 2015-07-16 | 2018-03-27 | 西安诺瓦电子科技有限公司 | Led lamp panel |
| CN105243968A (en) * | 2015-10-15 | 2016-01-13 | 利亚德光电股份有限公司 | LED (light emitting diode) display, LED television, communication method and communication device |
| CN109011639A (en) * | 2018-08-03 | 2018-12-18 | 合肥爱哆梦教育科技有限公司 | A kind of building blocks and system and method for trained children's lines recognition capability |
| CN109011639B (en) * | 2018-08-03 | 2021-06-22 | 合肥爱哆梦教育科技有限公司 | Building block, system and method for training recognition capability of line image of child |
| CN109413343A (en) * | 2018-10-17 | 2019-03-01 | 黄秀瑜 | A kind of LED video display system |
| CN109413343B (en) * | 2018-10-17 | 2022-05-03 | 黄秀瑜 | LED video display system |
| CN109256084A (en) * | 2018-10-29 | 2019-01-22 | 深圳市摩西尔电子有限公司 | It can cascade LED display control card, the cascade control method of realization and HDMI signal processing method |
| CN109256084B (en) * | 2018-10-29 | 2023-11-14 | 深圳市摩西尔电子有限公司 | Cascade LED display screen control card, control method for realizing cascade connection and HDMI signal processing method |
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| CN100507997C (en) | 2009-07-01 |
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Assignee: Shenzhen Konka Video System Engineering Co., Ltd. Assignor: Konka Group Co., Ltd. Contract fulfillment period: 2009.8.5 to 2014.8.4 contract change Contract record no.: 2009440001297 Denomination of invention: LED display screen signal interconnection method Granted publication date: 20090701 License type: Exclusive license Record date: 2009.8.26 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.8.5 TO 2014.8.4; CHANGE OF CONTRACT Name of requester: SHENZHEN CITY KONKA VIDEO + COMMUNICATION SYSTEMS Effective date: 20090826 |