This module is monochrome and comes in different shapes and sizes usually with character lengths of 8, 16, 20, 24, 32, and 40 and 1, 2 or 4 lines. Parallel LCDs like the popular Hitachi HD44780 series are connected to the microcontroller circuitry such that data is transferred to the LCD using more than one line and usually four data lines (4-bit mode) or eight data lines (8-bit mode) are used. In terms of interfacing technique, we can group them in two categories: Parallel LCDs and serial LCDs. Some modules offer color displays, while some others incorporate back lighting so that they can be viewed in dimly lit conditions. Some other LCD displays can be programmed to display graphic images. Some LCDs have 40 or more character lengths with the capability to display several lines. There are many devices in the market which come in different shapes and sizes. They are frequently used in microcontroller based applications. LCDs are alphanumeric (or graphical) displays.
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