Alphanumeric LCD module is a sort of LCD module distinguished from character LCD module, graphic LCD module and TFT LCD module. Its display format is alphanumberic. Compared with genneral module, this LCD module has many advantages such as low power consumption, SPI interface, powerful command set, user-produced characters, wide range of temperature, high reliability life, excellent viewing angles and so on. Alphanumeric LCD module has two display types covering positive and negative. Its real polarizer is transmissive, transflective and reflective. Furthermore, it has different series. It can be customized as TN, STN, HTN, FSTN according to the LCD type. The colors of STN incude yellow, green, blue and gray. The Alphanumeric LCD module has a connector to plug directly into the starter kits. It is widely used in industrial instruments, audio appliances and mobile phones.