Driving Method Research Of LED Display Device

LED display control system is becoming so important in the today’s information technology rapid development society, It involves electronics, semiconductor device technology, digital circuit design, and automation technology, which has a long life, high luminous efficiency and brightness, rich color display, easy maintenance, etc., it is widely used in stadiums, financial transactions, transport sites, supermarkets and other places, so that LED full color control system is explored in greater depth.This paper describes the design of LED display asynchronous control system based on FPGA, depth study the system architecture and display screen light principle of the LED full-color, and analysis the inverse gamma correction, grayscale realization principle, brightness control, while using DVI interface as the signal source received and use SRAM as external chip memory systems, with ALTERA CYCLONE IV as a master chip to design, research can be roughly summarized as the following:1, Designed the inverse gamma correction module based on look-up table, while achieving the correction gray levels extended to 1024, after using matlab processing data, then stored in ROM to save FPGA internal resources and the operator time.2, Analyzed LED display scanning realization the principle, cutting the video data and restructuring to store in SRAM.3, According to the structure of the module itself, the 18-bit SRAM address are in detail divided easy to selective reading of jumping when reading data, and using ping-pong operation of two SRAM, greatly speeding up the video fluidity.4,Designed shift control module and display module, using handshaking signals between a shift module and the up-down modules, controlling transmission of video data,then analyzed the relationship between the luminous efficiency and the refresh rate, introduced gray beaten principle and the fields number design, in the situation of ensure the refresh rate, LED display can achieve high brightness, and good sharpness.FPGA-based LED asynchronous control system designed in this paper, has been functional simulation, JTAG download test, the display effect has basically reached the expected objectives. LED module types on the market are more and more,cabling mode varied.a control system designed to support the module is limited, therefore, the following focus of work is which we should design a control system that can change the technologies parameters of a variety to meet the actual needs of different modules.