A 20x4 LCD display is a widely used module in various devices and circuits. It is favored over seven-segment and multi-segment LEDs because it is affordable, easy to program, and capable of showing special/custom characters and animations.

The display shows 20 characters per line across 4 lines, with each character formed by a 5x7 pixel matrix. It features two registers: a command register for controlling functions like cursor positioning, clearing the screen, and backlight control, and a data register for sending the content—text, numbers, or images—to be displayed.

Advantages of the 20x4 LCD display include:

• Cost-effective and accessible

• Simple to program and interface with microcontrollers

• Versatile, capable of displaying diverse information including text, numbers, and animations