This is a Python library to control Parallax 4 x 20 Serial LCD (3 wires).
The Parallax Serial LCDs (liquid crystal displays) can be easily connected to and controlled by a microcontroller using a simple serial protocol sent from a single I/O pin. The LCD displays provide basic text wrapping so that your text looks correct on the display. Full control over all of their advanced LCD features allows you to move the cursor anywhere on the display with a single instruction and turn the display on and off in any configuration. They support visible ASCII characters Dec 32-127). In addition, you may define up to eight of your own custom characters to display anywhere on the LCD. Some LCDs do have an onboard piezospeaker provides audible output, with full control over tone note, scale and duration using ASCII characters Dec 208–232.
This model features 4 rows of 20 black characters a green backlit field. It is also available in two 2 x 16 models and other colors.
https://www.parallax.com/product/parallax-4-x-20-serial-lcd-with-piezospeaker-backlit/