I have my raspberry pi and have been trying to get it to talk to a serial LCD via the uart ports on the gpio header. This post aims to demonstrate simple comms with bash (the command line) and then with programmatically using python. You can download this code if it’s of any use.
I purchased a serial LCD from Coolcomponents called the TextStar from Cat’s Whiskers Technologies (their product page). It’s a tiny display but incredibly easy to use. It even has four buttons on the sides to use as inputs to your project.