Introduction to LED display technology solution

Publisher: Supplier of LED Display Time: 2021-12-28 10:54 Views: 786

The first part LED display system overall planning

First, LED display system design requirements

1. Design basis and standard


LED display general specification SJ/T 11141-2003


LED display detection method SJ/T 1281-2003


General specification for light-emitting diode solid state displays (GJB2146-1994)


Test method for monochrome display tube GB/T12571-1990


Safety requirements for electric light source GB7248-1987


Code for construction and Acceptance of Electrical installation Engineering GBJ232-82


Basic environmental test code for electrical and electronic products, Test A: Low temperature test Method GB2423.1-89


Basic environmental test code for Electrical and electronic products, Test B: High temperature test Method GB2423.2-89


Basic environmental test code for electrical and electronic products, Test Ca: Constant humidity heat test Method GB2423.3-89


Code for engineering design of building and building cabling systems CECS 72.95


Safety requirements for electronic measuring instruments gb4793-84


Vibration test of electronic measuring instrument GB6587.4-86


Transport test of electronic measuring instrument GB6587.6-86


Code for quality inspection of electronic measuring instruments GB6593-86


Electronic measuring instrument reliability test GB11563-89


Packaging, marking and storage requirements for electronic measuring instruments SJ/T10463-93


Code for lightning protection design of buildings GBJ 57-83


Code for design of steel structures GBJ17 -- 88


Code for acceptance of construction quality of steel structure engineering GB50205-2001


IEC 60950


CE 89/336/EEC, 92/31/EEC, 73/23/EEC, 93/68/EEC

2. Display system working principle

2.1Display screen body

The display screen body consists of many display units. The screen body can be combined into horizontal and vertical units according to different size requirements. The LCD receives all digital signals from the controller transmitted through optical fibers or class 5 twisted pair cables, decodes them and displays them. The display unit is equipped with LED luminous module, driving part, switching power supply, cooling fan, etc.

2.2Display controller

Display controller is the core equipment of large screen processing information. Display controller can directly accept video signals or computer signals, signal decoding, conversion, processing, operation, coding, digital transmission, output display signals to the display screen body. You can directly adjust the brightness of the display screen on the controller or computer. The specific functions of the controller and the advanced technology used.

2.3Display screen working computer

The screen operator can output computer signals to the screen controller. When the display screen displays computer signals, the pixels on the display screen and the pixels in the corresponding area of the display screen work computer display are directly mapped. By running the display control software, the display computer can adjust and operate the parameters of the full-color screen controller through the control port.

2.4Optical fiber or Class 5 twisted pair cable

Signal transmission carrier of display screen system. Optical fiber or twisted pair 5, not only improve the signal transmission distance, and improve the signal-to-noise ratio at the same time, reduce the interaction between the front and rear level, make the whole control system wiring concise, beautiful; High reliability; Strong anti-interference; Easy to install and maintain.

2.5The power distribution equipment

Power distribution equipment provides power for the display. Power distribution equipment adopts ac three-phase five-wire system. Remote control of power distribution equipment, switch display from the control room.

2.6Audio and video equipment

Provides video and audio sources for the display. Video signal can be edited by video editing equipment.

2.7The system software

System software is display screen playback software. The computer operating system uses Windows 98/2000/XP.


Functions include screen control parameters (brightness, contrast, color temperature adjustment, screen freezing, power remote switch, etc.) adjustment and computer and video signal playback.

3、Control equipment selection

3.1Full color display control system

3.1.1Display control computer

The mainframe is a general-purpose computer. The output signal of the display control computer is one of the input signals of the video channel processing board. The system is also equipped with a high-performance sound card that can play computer audio programs through the sound system.

3.1.2 Led display controller

Receive computer display signal into LED display required digital signal.

3.2Control software selection

4、The power distribution design

Power distribution system to complete the entire display system power distribution, including: fan loop, control cabinet loop, control power loop, display loop. In addition, the power distribution cabinet can also achieve remote control or the control function selection, both can control the remote control room, but also in the screen body maintenance of the control.

The display screen system adopts AC 380V three-phase power supply (three-phase five-wire system power supply), and the working voltage is AC 220V. The total power consumption is the sum of the power consumption of each part.

5、Structure design of display screen

(1)Each display unit adopts post-maintenance mode, which is installed from behind, with simple structure and easy maintenance.

(2)Screen circumference (frame) decoration design, material selection, production in addition to protecting the screen function, as far as possible to consider the aesthetic feeling of the screen itself, trying to achieve the effect of landscape. Organically integrated with the environment.

6、Control system functions

Display system is a large electronic flat panel display which integrates video technology, computer and network technology, vlSI and other technologies. With multimedia, multi-input, real-time display of high-speed change of data information, mainly to achieve the following functions.

6.1Video image display function

You can play full-color video images on a full-color display. Using pure video processing technology, it can play video signals such as cable TV and satellite TV, video camera, DVD player and VCR directly. Realize live real-time broadcast.

It can overlay text information on the video screen, edit and play panorama, close-up, slow motion, special effects and other effects in real time (it needs to configure the support of nonlinear video editing system and subtitling machine). In the system design, equipped with a multi-channel audio and video switcher, can be connected with the camera to achieve live transmission.

It is connected with radio and TV satellite wireless network and cable network, and can receive TV programs.

Connected with video player equipment, such as LD, VCD, DVD, VHS, BT-SP, etc., can play all kinds of movies, TV dramas, documentaries, videos (NTSC, PAL, SECAM and other TV systems) and so on.

Cooperate with site sound (power amplifier, loudspeaker, etc.), can widely serve large gatherings, artistic performances, new product advertising display, etc.


Audio - image synchronization can be realized by connecting with background sound system.

6.2Computer information display function

In the system design is equipped with a computer for editing all kinds of text information, picture information, etc., can achieve: display all kinds of computer text, forms, graphics, images, etc. (including BMP, JPG, GIF and other formats);

2. 3d computer animation (including AVI, MPG, SWF and other formats);

Install an Ethernet network card in the computer, connect the network cable and network card with the LAN HUB/Switch, can realize the connection with LAN (or competition network or INTERNET), realize the remote control, display screen remote play information content, download and play network information through the network.

Text editing of the information needed to display, such as: font, font, size, etc., special effects editing, such as: left-pull, right pull, hundred Windows, push, push, rotate, zoom, zoom, scroll, wonderful shot playback, pause, slow motion, and the overall editing of the playback file. There is a temporary message interrupt function.

6.3Display screen Parameter Setting

Input signal interface selection. That is, Video, S-Video, VGA selection.

Input signal brightness, saturation, contrast, image position and other parameters setting;


Screen brightness multistage adjustable, without loss of gray level.


Screen chroma can be adjusted at multiple levels to ensure the white balance of the screen.


Adjust the position of a screen display image.

6.4The function of the player software

It adopts standard WINDOWS graphical man-machine interface, which is intuitive, vivid and easy to operate, and provides the possibility for users to quickly operate and realize various functions. Mainly to complete the display screen control and all kinds of text, graphics editing production.

Select the font of the message to be edited (in accordance with the GB font library).


Select the font size of the message to be edited.


You can set the time, order, interval, and so on of the files to be played.

You can set the special effects broadcast mode of the files to be played, that is, blinds, zoom in, left move in, right move in, up, down, Mosaic, light in and light out, scanline entry, expansion entry, shrink exit, shrink exit, erase exit and other dozens of special effects.

You can add, delete, modify, adjust and edit files to be played.

Supported file format type.


Static images can be in BMP, JPG, GIF, or PNG formats.

Static text supports THE TXT format.


Dynamic video MPEG, M1V, AVI.


Animation GIF, FLC, SWF.


The program can be set up in advance, and the program can be set to play in a loop according to the sequence of the program, so that no one can operate the program.

二、Display system security assurance measures

1、High strength structure design

High strength aluminum alloy structure design, high standard design requirements, so that the display screen in the use of solid and reliable.

2、Over current, short circuit, open circuit, over voltage, under voltage, lightning strike and other protective measures

Screen power supply with overcurrent, short circuit, overheating, overvoltage protection, power distribution cabinet can also be designed over current, short circuit, open, overvoltage, undervoltage, lightning strike and other protection measures, the whole screen grounding lightning protection processing.

Lightning protection measures: The PGND cables of the devices in the power distribution system, display screens, and control devices must be properly connected to the grounding cable system of the surrounding buildings (the resistance to the earth must be less than 4 ohms). Power grid lightning protection depends on the power distribution system of the building itself to install the national standard lightning protection equipment.

3、Anti-virus measures

The PC in the control room is equipped with anti-virus software and firewall to prevent network virus damage.

4、Operation Permission Setting

Important parameters of the control system, such as mapping coordinate adjustment and brightness adjustment, must be controlled by a password. The password must be controlled by senior management personnel only to prevent important parameters from being accidentally changed and ensure the security of system operation.

5. Temperature detection and equipment monitoring

Each unit/unit has a temperature detection device, its temperature status can be queried by the upper computer control, when the temperature exceeds the set threshold, will also alarm display, prompt management personnel emergency treatment.


Each screen is equipped with a monitoring device for image monitoring, so that managers can understand the safety status of the equipment at any time.

6、Redundant systems and component backup

The LED display screen is equipped with an additional set of control system and conventional parts, which can be replaced immediately in case of accidents to ensure the least impact on broadcast.

三、System Operation Guide

The system will provide the following manual according to the standards for users to use.


1) Product specifications


2) User manual


3) Maintenance manual

The second part of LED display product quality assurance measures

一、Quality assurance

1、Material quality assurance measures

1.1、Select high-quality components to ensure the quality of products

Integrated circuits require high reliability products from international famous manufacturers (MOTOROLA, PHILIPS, TI, SGS-Thomson, HITACHI, AMP), etc. Programmable logic devices require ALTERA's latest products to ensure the stable and reliable operation of the core part of the controller. Taiwan MeanWell (Mingwei) co., Ltd. is used in the display power supply, which has the characteristics of over voltage protection, over current protection, temperature control protection, low noise, low power consumption, high stability, etc. Requirements printed circuit board (PCB) is entrusted through ISO9001 certification and the United States UL certification of domestic excellent enterprises manufacturing and processing; All kinds of connectors are made from famous companies in Europe, America, Taiwan and Hong Kong to ensure stable and reliable signal transmission.

2、Quality assurance measures for production and transportation

2.1、Quality assurance system

Display design, device procurement, manufacturing, installation of the whole process in strict accordance with ISO 9001:2000 standards.

2.1.1、Product reliability

LED display system is set TV technology, image processing technology, computer control technology, communication technology, single-chip control technology, integrated circuit technology, power supply and distribution technology and so on more professional, multidisciplinary comprehensive use, because the system is complex, involving more professional fields, therefore, the system is stable and reliable.

2.1.2、Product quality and installation and commissioning inspection standards

The enterprise standards are formulated based on the relevant standards of the International Commission on Illumination (CIE) and the national standard for LED display (see the annex for the national STANDARD for LED display), combined with the actual situation of the industry and the enterprise. Various important optical indicators such as brightness, chroma coordinates, color temperature, etc., are formulated during the design. Is determined according to the use of the display screen, and the measurement of these standard parameters using the instrument is CS-100, in accordance with the Japanese standard, can ensure that the product is manufactured according to the design requirements.

2.2、Inspection and acceptance

2.2.1、Inspection and acceptance plan

2.2.1.1、Factory acceptance

Factory acceptance shall be self-checked by the company at the time of delivery according to the contract requirements and relevant technical standards.

2.2.1.2、System will check

After the installation and debugging of the whole display system, our school will invite relevant authoritative testing institutions and invited authoritative experts to form an acceptance team to carry out an overall comprehensive test of the system and check whether the whole system meets all the requirements stipulated in the contract.

2.2.1.3、Inspection and acceptance criteria

Full color display screen each indicator grade evaluation

2.2.1.4、List of full color display test items

2.3、Packaging and transportation quality assurance measures and plans

Transport the display equipment to the installation site in a safe, reliable and efficient way.

3、Implementation of technical specifications

SJ/T1114-2003 General technical specification for LED display screen


GB2421 General rules for basic environmental test procedures for electrical and electronic products


GB2423.1 Basic environmental test specification for electrical and electronic products low temperature test method


GB2423.2 Basic environmental test specification for electrical and electronic products - High temperature test method


GB2422 Terms of basic environmental testing procedures for electrical and electronic products

Part III Engineering and Services

I. Construction requirements

1、System piping arrangement

The control cables are optical fibers or class 5 twisted pair cables (for communication with display screens), and super class 5 twisted pair cables (for remote control of power distribution) are routed from the control room to the screen through galvanized steel pipes or PVC pipes. Connect ground ring at galvanized steel pipe joint.

Distribution cables are high-quality plastic cables, which are routed through PVC pipes from the distribution cabinet to the screen body.

2、Environmental and power factor data, requirements and suggestions for civil engineering, power distribution and decoration systems

Operating temperature: -20℃ ~ +50℃


Relative humidity of working environment: less than 95%, no dew

二、Acceptance of work

1、Factory acceptance quality standard

Project acceptance quality standards shall be carried out in accordance with the technical requirements of the contract and with reference to the enterprise standard, industry general standard of LED display and other relevant specifications and standards.

2、List of Completion documents

After the installation and debugging of the display screen system is completed, the list of relevant technical documents shall be provided as follows when the equipment is handed over to the user upon completion:

三、Free technical training

1、Technical Training Arrangement

It is required to train display operation and maintenance technicians to ensure the normal use of the display. Training can take place at the location of the manufacturer or customer.

Training main contents:


Computer and auxiliary system operation (basic computer knowledge and WINDOWS operation);


Operation of system controller and display screen;


Installation, maintenance and daily operation of display software and related application software;


LED electronic display daily management, common fault diagnosis and maintenance methods;


Iv. After-sales service


1. After-sales service requirements


Require "one year warranty, lifetime warranty", and in the form of a contract to guarantee maintenance response time. After the end of the warranty period, the system will be maintained for life. Replacement of spare parts will only be charged at cost.


Provide free replacement and maintenance for product quality problems caused by design, manufacturing, installation process and materials. If the equipment is damaged due to human factors or force majeure, the corresponding cost of equipment replacement and maintenance will be charged.


3. Reaction time


Engineers are required to provide emergency support 24 hours a day, 7 days a week.


Within 2 hours after receiving a phone call, email or fax notifying the fault, the maintenance engineer shall provide a solution by phone, fax or E-mail.


On-site service: the maintenance engineer will arrive at the site within 48 hours to troubleshoot the faults that cannot be eliminated by telephone, fax and E-mail.


4. System upgrade service


In the warranty period, the multimedia display management software, player software in free upgrade services.


If party A needs to upgrade the functions of the system and increase the functions of equipment and software, the cost shall be charged.