The first chapter is the scheme demonstration of 16* 16 dot matrix LED electronic display screen.
1. 1 scheme demonstration
Theoretically, we can obtain the desired display results by controlling the LED devices that are opposite to the positions of the points that make up the figures or characters, regardless of whether the figures or characters are displayed. This method of controlling the lights on and off at the same time is called static driving display mode. The lattice of 16× 16LED has 256 LEDs. Obviously, the MCU doesn't have that many ports. If we use latches to expand ports, the lattice of 16× 16 needs 256/8 = 32 latches. This number is huge, because we are only a lattice of 16× 16, and the display screen in practical application is often much larger, so the cost spent on latches will be a huge number. Therefore, in practical application, almost all display screens do not adopt this design, but adopt another display mode, called dynamic scanning.