Technical performance of dual color LED electronic display screen

256 gray level LED display control system comprises a multimedia card, bus driver, frame controller and display unit. The multimedia card main function is to be displayed by computer digital (itself VGA graphics function), but also for video signal sampling of the external input, converted into digital signal output for display use. The long line driving card converts the digital signal output from the multimedia card into the RS422 interface signal, which is convenient for long-distance transmission. In the case of the distance between the main control computer and the display screen (350m), a reliable result can be obtained by using the differential transmission method. Transmission media for five types of twisted pair. Frame controller as the core unit of the display, the main function includes: data receiving, data processing, data storage, data distribution, gray scale, visual correction and adjustment. Because of the function of the realization of complex control content is various, so the large-scale programmable devices, highly integrated circuit, gray data signal frame controller assigns an output signal is sent to the display screen division, parallel transmission, and faster transmission frequency. The most significant feature of the control logic control system is highly concentrated, and highly integrated. The front display module mainly comprises a driving circuit, even if the color features are composed of a main controller complete, so the display module circuit is very simple, greatly improving the reliability and maintainability of the screen body.