LED advertising screen system design

[Source: "High-tech LED-technology and application" March issue Fang Zhenhan]

The arrival of the information society has promoted the rapid development of modern information display technology, and thus formed a series of information display products such as CRT, LCD, PDP, LED, EL, DLP. Among them, the market demand for LED display has become one of the mainstream products of flat panel display with outstanding advantages. LED (Light Emitting Diode) display is a new type of flat panel display device. It is used to display various information such as text, text, graphics, images and quotes, as well as TV and video signals and display by LED device array through certain control methods. screen. Due to its high brightness, clear picture, clear color and bright colors, it has become a public multimedia display product, which has the advantage that other flat panel displays (such as rear projection TV, plasma, LCD, TV wall, etc.) can't match. At present, with the improvement of LED material technology and technology, LED display has been applied in various fields such as transportation, securities, telecommunications, advertising, etc., and its market is still expanding and the prospect is huge. After the establishment of the school's scientific research project, the LED advertising screen project designed and implemented by the teachers and researchers of the electronic information engineering profession passed the evaluation of the expert group and achieved substantial results. The practical ability and pioneering and innovative level of teachers and students participating in scientific research have been fully exercised and improved.

First, the architecture of the experimental platform system

The hardware circuit part emphasizes the extensible nature, and the software design mainly reflects the diversification of program writing. Main experimental platform:

(1) The design of the hardware scheme outlines the design ideas for each module, focusing on the design of the display driver circuit, especially the design of the column driver circuit. It also introduces the working principle of the control signal and selects the single chip chip AT89S52, the driver chip 74HC595 chip and so on.

(2) In the software design, the table lookup instructions and the serial port working mode are introduced. The program block diagram of the system is constructed, and each submodule program is described in detail. And display the formation of a single line program.

For more information, please refer to the "High-tech LED - Technology and Applications" March issue

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