Liquid Crystal Library is a library for controlling LCD displays compatible the Hitachi HD44780 driver, characterised by their 16 pin interface. The 16 pins might be connected via an I2C interface. These displays contain a matrix of 5x7 pixel blocks used to display characters or small monochromatic images. The displays are usually named according to how many rows and columns they have, e.g. 16x2 or 1602 for 16 columns and 2 rows, and 20x4 or 2004 for 20 columns and 4 rows.