Definition: LCD Screen
Liquid Crystal Diode (LCD) screens are basic modules used commonly to display data in a visual format from an embedded device such as a microcontroller. They commonly come in two sizes: 20x4 and 16x2. These numbers represent the number of characters (letters, numbers, symbols, etc.) on each line of the display, followed by the number of rows on the display. So, a 20x4 LCD screen will have 20 characters available on each of its 4 rows of text.
These screens feature low power consumption and can display custom characters and animations that other LED displays (such as 7-segment displays) can not. Additionally, these LCD screens work directly with ATmega and Arduino microcontrollers, making their implementation quick and simple.