基于FPGA的全彩色LED點陣顯示屏控制器的設(shè)計
[Abstract]:LED display screen is a large screen display system composed of light-emitting diode lattice module. It can dynamically display information such as text, image and video. It has long service life, high reliability, low power consumption, high brightness, rich color, and has been used in industry and traffic. Commercial advertising, information release, sports competitions and other fields have been widely used. The research object of this paper is the full color LED lattice display screen controller. A controller based on FPGA is proposed, which combines software and hardware. The controller consists of Ethernet interface module, FPGA control module, DDR buffer module and LED driver circuit module. The host computer software loads the information source (text, image or video) and sends it through the network to the controller matching its IP address. The Ethernet chip on the controller transmits the data to the FPGA control module in the form of frame. The module decodes the received data frame, and recombines the image data with 緯 -inverse correction and bit separation. The function of the module is to cache the data for the FPGA. Finally, the data and control signal to be displayed are sent to the LED driver circuit to drive the LED screen for display. The design of the FPGA control module is the core of the design of the LED display screen controller. The function modules include: GMII interface data communication module, 緯 inverse correction module, bit separation and recombination module, gray level generation module and DDR read and write control module. Scan and drive control module and clock module. GMII interface data communication module. Ethernet switch chip communicates with GMII interface of FPGA. R inverse correction module uses table-lookup mapping method to realize data 緯- Inverse correction. LED screen grayscale scan according to the weight, So it is necessary to separate and recombine the gray level data after 緯 inversion, and adopt the scheme of horizontal storage and vertical readout. The DDR read and write control module includes read address generation module, write address generation module and read and write control module. The read address generation module generates the read address according to the color and weight, and the write address generation module generates the storage destination address of the gray data according to the color data. The read-write control module controls the read and write operation of DDR memory, and the LED scan and drive control module generates the driving control signal and sends the image data to the drive circuit. The clock module generates the required clock signal for the related module. In this paper, the overall design scheme of full-color LED lattice display screen controller and the hardware / software design of each module are described in detail. The test results show that the design is flexible and effective.
【學(xué)位授予單位】:南昌航空大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2012
【分類號】:TN873;TN791
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