Room shielding luminous room shielding materials to be used LED Ultra Bright luminous materials, – height (UHB) PL intensity is reached or exceeded 100mcd the LED, also known as the CANDELA (cd) level LED. A1GaInP and high brightness InGaN LED development has progressed very rapidly. has now reached GaA1As conventional materials, GaAsP and GaP unattainable performance level. 1991 Toshiba Corporation of Japan and the United States HP company developed InGaAlP chrome-bright orange L ED,1992 InGaA1p590nm yellow, high brightness LED practical use. The same year, Toshiba Corporation developed InGaAlP 573nm Ultra Bright yellow-green LED that light up to 2cd. 1994 japanese companies in developing Asia 450nm InGaN blue (green) color high brightness LED. At this point, color display for the three primary colors red, green, blue and orange, Huang multi-color LED CANDELA have reached a level of light intensity, a super-high brightness, panchromatic, make outdoor LED full color display becomes a reality. Brightness higher than 1000mcd, all-weather outdoor meet, panchromatic display, LED color screen can show sky and the ocean, 3D animation. The sharply new, ultra-high brightness blue LED reached an unprecedented performance. Room shielding pixels are present Red / Green / Portland three primary colors of a number of single-tube LED structure, The end product is commonly used extinguishers pixels and pixel module configuration. Pixel size to more than 12-26 mm pixel : Monochrome to 2R/3R/4R. Pseudo-color to 1R2YG/1R3YG/1R4YG, sleekly 2R1G1B components to form the majority. Room shielding system design principles (not as described) design principles brightness and color matching based on reliability design principles of safety design principles of the management and operational design principles Ping-wall installation of parquet : that the display window walls, and the fixed wall. This means the most common way, but easy to achieve school. Sit Vertical : Display Sitting on the platform. This approach most likely to achieve, in terms of occasions, should give priority to the use of this installation method. Embedded : screen embedded in a wall box. This means rare, if not depth walls sag have to consider maintenance. Side exo : display by both sides, hanging on the side of buildings or two columns. This means commonly used in the open space, the flag-screen, two-column screen based on the requirements of flying structures. Display Control System Dacheng display control system by collecting / sending and receiving subsystem / grayscale processing subsystem two parts. front of their computer’s VGA output interface features or components with digital output multimedia card, transmission from the five-UTP realized, back to the electronic screen display unit. Acquisition / subsystem to send not less than 60 per second frame rate of 24 Bits acquisition true color signal and the turn-memory work to smooth the way into the show to bring their own cache, in the center processing units under the control of Gray completed the transformation weights, LVDS difference to the five-UTP access. – Acquisition achieve five UTP / Send and receive subsystems / grayscale processing subsystem link between the complete signal transmission. In non-relay circumstances, the maximum transmission distance of up to 300 meters. Gray described achieve Dacheng receiving / processing subsystem from the gray-five UTP on receiving 24 Bits true color signal weights were 20, 21, 22, 23,24,25,26,27 deposit, each with 8-color component weights, through CPLD achieve 256 gray control signal. Video reception circuit, reservoir circuit, high speed circuit was made, display control circuit are scanning the interference, 10-150 with a frequency of the screen refresh, and so they have the right to the stability and real-time, assure genuine 24 sleekly effect. The sharply-the three-color gray in 256 different combinations of colors for : 256 × 256 × 256 color = 16777216 (16M colors) nonlinear video signal correction TV is to meet the luminescence properties and electrical properties designed, it can display on television or broadcast. If television signals without correction, it will have serious color distortion. So we input video signal to the front nonlinear correction, color correction space will be a marked improvement. LED corresponding to the big screen, the brightness and intensity physical proportional to the value, if not corrected, obviously unable to meet the requirements of color reduction, the specific effect on the show : low-level grayscale great jump, Senior Gray also wonder. As we all know, the eyes light intensity of feelings is nonlinear, low light, the intensity doubled, Eye feel the increase more than doubled; bright light, the intensity doubled, the eyes feel less than 100% increase, Gray therefore need to do nonlinear transformation, often with low gray spacing small, high-intensity interval always big. Therefore, in order to guarantee LED large screen color integrity, must be anti-gamma correction after correction, it’s similar characteristics and CRT. We can clearly see that the gray-scale correction by the display screen texture is clear, hierarchical sense, brightness soft, Shading the transition smooth. True color screen white balance, color deviation and rich colors of its technical assurance white balance means that when each base color has reached the highest level of brightness, in a certain distance away from the visual to show excellent temperature of 6500K white color deviation means LED tube especially red Color LED with the brightness temperature and the change of a single phenomenon. The existence of color deviation on a specific temperature in the production of white balance adjustment to the screen, With the temperature change will lose balance As the screen or the uneven temperature distribution in the whole screen broadcast for a period of time after the show to “make” phenomenon. The companies against the True Color display color deviation caused by the problem, have a comprehensive solution to ensure that it can effectively True Color display of rich colors and consistency. Intelligent Control and Protection System by Intelligent Monitoring System various sensors, monitoring and control of computer systems pose, for the monitoring screen work environment parameters, timely control related protection system to ensure the normal work screen. Performance parameters are no major shift school. Protection systems including : cooling system, waterproofing system, power distribution system lightning protection systems. Display control software system to normal operation requires software support. Software designer company through careful preparation, composition, the creation of a powerful, easy to operate software configuration system. In the software system, according to the different software, we put them assigned to two groups : one for the display and control software. completion of the main text, animation and video images broadcast switching and control, the screen is the basic software; Another content editing software mainly for the production and transmission of creative editing, They will display the content is constantly updated and changing

With the high development of communication in our society,LED large screen include so many kinds of technique such assemiconductor technology,electrocircuit,integrate circuit,image manipulation,information transfers,computer network andelectronic manufacture technology and engineering has become moreand more active in the information field,and also make a greatprogress with application and populaziration in every walk of life.From the development of the material of LED,the technique ofash-degree control,the clearly multicolor image’s displaying tothe active and high efficient drive electrocircuit,also theimproving skill of control system are all incarnate the greatprogress of the LED-industry.In addition,with the developmentof network LED large screen is more and more in used,intelligentize net control and net-join control technology arealso bu used in practice under the multimedia and informationdisplay system composed with multi-device environment.In the basis of the LED large screen system request and consultdatum,this text analysis and sum up the design project.Such assystem-configuration,whole system task flow,the design ofsoftware control system,the programmer for serialcommunicationand the control for singlechip.The system task flow is:under the compilation-tool of the software control system thecompilation-work can be accomplished;then accomplish picking upthe information word-model,afterwords adding extra display effectinto system according to the display pattern and save the handledfile which needed,multi-files can also be saved to one file,andthen transfer data by using Windows functions.After transfer datato the hardware system SMC,save the data and drive theled-field-array,the image displaying is come true.As the project’s request,the software-model include four section: 1,compilation function model:according to the windowsoperating system,the design of software style is just as the windows.Through the button in the menu,accomplish thecompilation-work.2,picking-up word model:in order to accomplish compilation,save and foresee in one line,the system achieve it by the softwarecontrol. 3,add additional effect and foresee model:through adding theactive effect,plentify the display model and before saving it canbe foreseed. 4,serialcommunication model:under the using request thesystem’s communication between computer and hardware-model is justas the serialcommunication.When it under the windows API function.The hardware-model is under the singlechip’s control,achievesaving the information and driving the LED.Including:1,led-field-array display:it is consist of LED,fixation anddriving electrocircuit.At last through the control of singlechipaccomplish the word and picture display.2.center control system:under transfer data to the hardwaresystem SMC,save the data and drive the led-field-array,the imagedisplaying is come true.Through the EPROM save-model achievesaving data. According to the analysis and design of the system,arithmetic,program and support of hardware device,the system is lucubratedand the function of the software control system module and thehardware microcontroller is design,and then finally is in usedin reality.But at the same time,the analysis and design is lied on theapplied request.This system is engaged in propaganda for thetraffic law in the hall of traffic direct and control.To otherapplication request,whether this system is needs updating or the design is satisfied is need farther investigating.The moreadvanced control system and the more pure communication techniqueneeds father learning.Keywords:led,field-array,word-model,serial ommunication415