LED Dot-matrix display

Driver MM5450

A dot-matrix display is a display device used to display information on machines, clocks and many other devices requiring a simple display device of limited resolution. Light emitting diodes aligned in a form of matrix constitute a dot matrix display. Arrangement of the LED's in the matrix pattern is made in either of the two ways: row anode-column cathode or row cathode-column anode. In row anode-column cathode pattern, the entire row is anode while all columns serve as cathode and vice-versa pattern is there in row cathode-column anode.

 A dot matrix controller converts instructions from a processor or controller into signals which turns on or off lights in the matrix so that the required display is produced. We covered how to interface seven segment LED displays to a micro-controller  Today, we will move on to interfacing an LED dot matrix display. LED dot matrices are very popular means of displaying information as it allows both static and animated text and images.

Perhaps, you have encountered them at gas stations displaying the gas prices, or in the public places and alongside highways, displaying advertisements on large dot matrix panels. In this experiment, we will discuss about the basic structure of a monochrome (single color  LED dot matrix and its interface with a micro-controller to display static characters and symbols. I am using the 89C51 micro-controller on for demonstration, but this technique is applicable to any other micro-controllers that have sufficient I/O pins to drive the LED matrix driver MM5450 through SPI protocol.

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