How to display Alphabets on dot-matrix display in Assembly Language
LED Dot Matrix Displays
Introduction
Unlike 7 segment displays you can use dot matrix displays to generate alpha, numeric, or custom character output. This is a quick introduction to the basics of using monochrome LED dot matrix displays with microcontrollers.
Structure and operation of LED dot matrix displays
In a LED dot matrix display the LEDs are located at the column and row intersections of the matrix. LEDs in the same row are connected together as are LEDs in the same column.
There are not enough pins on an LED dot matrix display package to directly access all of the LEDs in the matrix at the same time. For example a typical 5x7 monochrome dot matrix display has 35 LEDs but comes in a 12 or 14 pin package. the pins are arranged internally so that each one controls a specific row or column.
You turn on an individual LED by setting its row and column pins to the proper polarity. For example, in the CCAR matrix on the left the switch in row 1 is closed causing a positive voltage level to be applied to the anodes of all of the LEDs in that row. The switch in column 2 is also closed which ties the cathodes of all of the LEDs in that column to ground. The LED at the intersection of column 2 and row 1 is forward biased and turns on.
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