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The LED display incorporate the micro electronic technique, computer technology and
information processing as a whole, it becomes the most preponderant of a new generation of
display media with the advantages of bright in color, high dynamic range, high brightness and
long operating life, etc. The LED display has been widely used in the bank, securities trading,
highway signs, airport and advertising, etc. According to the display color, the LED display screen
is divided into monochrome screen, double color display and full color display.
With the diversification of the LED display’s color and the ceaseless rise of the display
demands, the LED display’s drive circuit and control technology also get the corresponding
progress and development. The earliest monochrome screen just displaying Chinese characters,
simple character or digital, so the requirements of the controller are relatively low. With the widely
used of the double color LED display, the performance of its controller will also increase. In
recent years, the full color LED display with three primary colors of red, green, blue and grayscale
display effect has been highly attention with its rich and colorful display effect. Every true color
pixel includes three son pixels of red, green, blue, using the space colour mixture to realize the
multicolor.
The dynamic scanning control system of LED full-color display is designed based on
MSP430 microcontroller technology of the low power consumption. The gray control technology
of this system used the new method of pulse width modulation (PWM) and 19 games show
principle are combining. This method in meet 256 level grayscale display conditions, improves the
efficiency of the LED light device, and enhances the administrative levels feels of the image.
Drive circuit used 1/8 scanning constant current drive mode, and make full use of the single chip
microcomputer I/O mouth resources to complete the control. The system supports text, pictures
display of 256 grayscale full-color LED screen.
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