Screens are vital output devices for computers. Screens will be needed to monitor all computer based functions. Computer screens might be produced in-situ. If light emiting polymers and organic compounds can be produced, then BioLED screens could be printed. LEDs are a form of lighting that might be produced on Mars.
Types of screens
Cathode ray tube (CRT)
These are a obsolete technology that is unlikely to be produced on Mars.
Liquid crystal display (LCD)
These have been mostly replaced by LEDs.
Bio light emitting diodes (BioLEDs)
These might be produced on Mars