The study of the led display used for 8 x 8 dot matrix display screen, focuses on the dynamic processing method, due to the limitation of the display screen, in the study design can only display English and Numbers. A basic led screen from line 8 x 8 point, a total of 64 led display screen has a total of Yin and Yang two connection ways. To composed of 8 x 8 dot matrix led display, data commonly connected the 8-bit parallel data port of the microprocessor, and the gate end individually enabled (gate), choose need to light a column, realize the dynamic display effect by way of time-sharing multiplexing. Gate way generally has two kinds: independent gate and decoding strobe.

If the screen is small, the processor has enough I/O ports is available, you can each I/O port connected to a gate, if the screen is bigger, or the processor's I/O port is not very rich, can be gated by decoding way. For example when 8 of 8 x 8 dot matrix led an 8 x 128 lattice led screen, direct gate way to 64 I/O port, and decoding strobe way need only six I/O port.

The software design.

8 x 8 dot matrix led screen display of characters need to convert the actual display by means of modulus data, this

 process can be done by Pcto LCD 2002 software, Pcto 2002 is a LCD LCD matrix generation software, suitable for the same font generated for lattice led large screen. Choice of the specifications of the generated by English characters here is 8 x 8 dot matrix, at the same time set the modulus way as the cathode (lit to 1), per column type and consequent (high) before.

Hardware circuit:

In the led display system, using an 8 x 8 display, so the gate eight I/O port, a gate way using independent gate way. Through software Atmega16 I/O port to provide strobe signal. Atmega16 does not need additional its drive circuit, software Atmega16 has the ability of direct drive.

Through the research of led display screen display system, focus on the method of the led large screen display dynamic, respectively used two timer to control the brightness of the display screen and display dynamic shift speed of the characters. Led large screen display system, schematic diagram design under the DXP 2004, according to the characters can be modulus by Pcto LCD 2002 software in the system design, according to the actual type of led screen and circuit connection Settings, choose the suitable way of cathode modulus. Using led switching power supply, applicable laws and regulations and standard requirements, to assess and review the new product development design, safety science and effectively monitor the product quality laid a solid foundation; To actively deal with technical barriers to trade, help enterprises to improve the level of quality management, quality control ability, and the wall response capacity, is of great guiding significance.

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