PiFace Control and Display Python module.
Contrast is adjusted with screwdriver + screw by IR node.
http://pifacecad.readthedocs.org/
You can also find the documentation and some examples installed at:
/usr/share/doc/python3-pifacecad/
Make sure you are using the lastest version of Raspbian:
$ sudo apt-get update
$ sudo apt-get upgrade
Install pifacecad (for Python 3 and 2) with the following command:
$ sudo apt-get install python{,3}-pifacecad
Test by running the sysinfo.py program:
$ python3 /usr/share/doc/python3-pifacecad/examples/sysinfo.py
You will need to configure the IR receiver.