Hardware Design And Implementation Of The LED Screen Synchronous Display System

Along with the development of the semiconductor technology, the LED screen has acquired rapid improvement in design, manufacture and application. It went through from single color and two color image LED screen to full-color video LED screen. During this process, both material performance (high brightness LED screen) and display mode (computerized dynamic display) have obtained great progresses.Compared with other display mediums, LED screen has some unique advantages such as high reliability, long durability, high brightness, low power consumption, abundant color and so on. Now LED screen has been widely used in industry, transport, business advertisement, information release, physical match and other fields. With the fast development of full-color display technology, LED screen will be widely used in more fields.This thesis proposes a hardware design scheme of full-color large LED screen synchronous display control system. The system receives video data by DVI interface and transmits data via Gigabit Ethernet. This thesis first analyzes the actuality and development trend of LED screen, and does deep research on full-color LED display technology. Secondly, the EDA tool Allegro SPB used for hardware developing is introduced. Considering the demand of data quantity and signals timing, the whole design and implementation based on FPGA, DVI interface and Gigabit Ethernet are presented. Then the function modules implementation of system are discussed in detail, including FPGA XC3S250E, DVI interface, USB interface, Ethernet interface, LED screen driving circuit and power supply circuit. This thesis also analyzes Signal Integrity and Electromagnetic Compatibility problem in high-speed PCB layout, and several effective methods used to improve electromagnetic interference are summarized. The conclusion and future work are discussed at the end of this thesis.