Design Of LED Screens Synchronous Control System

LED display panel, as a new display technology has drowned more and moreattention. It has many irreplaceable advantages by other display technology such aswidely dynamic range, long-distance visibility, and stable working property and so on.It is becoming the first choice to announce media information in crowed places such asairport, leisure square, securities market, and large exhibition center etc. With theunceasing development of full color LED display technology, the LED display marketprospects will be more promising.Firstly this paper takes a comparison of the present LED screen about their meritsand demerits, and then puts up the system scheme. The LED display panel’ssynchronous control system is mainly consisted of sending-card and a fewreceiving-cards. Sending-card is made up of DVI module, FPGA-controlling module,table-tennis cache of double SDRAM module, and etheric network sending-module,while receiving-card is made up of etheric network receiving-sending module,FPGA-controlling module, SDRAM cache module and LED scanning driver module.According to the system scheme, this paper firstly focuses on the device selectionanalysis, and secondly makes a detailed introduction of the hardware diagram design,and then based on the characteristics and requirements of the system it proposals somesolutions for the PCB design. In order to improve the image quality and the visual effectof LED display panel, it adds the inverse gamma correction, the transform of gray-levelmodule, contrast ratio and color temperature adjusting module in FPGA. Finally, toachieve the goal of supporting different kinds of scanning and routing manners of theLED screen, the remote program upgrading module of FPGA in this design can make aremote, real-time and dynamic modification of the configuration program of thereceiving-card on FPGA.In this paper, it takes EP3C5F256FPGA, the Cyclone III series of Altera, as themain master device, and RTL8212F, the bandwidth up to2G bits, as the physical devicetransceiver of Ethernet networks. So finally it realizes synchronization driven system ofa LED display panel with the resolution of1280×800, the value of gamma1-5continuous adjustable,1-16gray levels adjustable, and brightness, color temperature,contrast ratio adjustable, and remote upgrade function of the FPGA configuration.