Led display generally experienced technicians know that led advertising screens need to have high display performance and effect, but for convenient control, led advertising screen control system should have enough input, output interface and remote communication functions. Our system structure of LED advertising screen controller based on HDMI1.3 technology. The system can be divided into six models: analog input, one VGA input, two DVI input, status indication, real-time clock and fiber data transmission.
At present, LED advertising screens mainly include synchronous display and offline display according to the data transmission mode. The LED advertising screen control introduced in this paper is a synchronous display system, which uses a set of embedded system to provide video source for LED advertising screen, which can reduce cost, high feasibility and flexibility, and easy construction. . The independent video LED advertising screen system is completely out of the control of the computer, and can realize communication, video playback, data distribution, scanning control and the like. Since the controller controls the large frame data, it is necessary to allocate the data provided by the video source, and correctly send the data of different ranks to different controllers.
The data correction sub-module receives the data input from the front end, and performs the point-by-point correction on the data and stores it in the SDRAM. The field data is then divided into 8 groups and sent to the LED advertising screen distributor.
The FPGA reads the input data according to the timing relationship and performs the next processing. Since the parameters of the LED advertising screen cannot be completely consistent during the production process, in order to obtain a good image display effect, the LED tube must be screened.
When the data is transmitted, the signals are transmitted in the form of LVDS. Since the system adopts the architecture of MCU+FPGA, real network remote operation can be used not only as a general LED advertising screen controller, but also as a large outdoor advertising media network. According to HDMI technology control LED advertising screen, suitable brightness, fine resolution, high field scanning frequency, high pixel, can be used for outdoor broadcast applications. The design is calibrated at a single point, allowing purchasers to relax LED requirements in terms of brightness and color, and the cost of related purchases is reduced.
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