Determing The Correct Display For Your Application and Location:
What is the preferred size of the sign?
How far away does the sign need to be read? (Rule of Thumb: Every 50 feet of viewing distance requires an additional character height for legible text messages.)
To be able to read the sign properly, what degree of viewing angle is required?
Does the sign need to be single face, double face, or mutiple faces?
Principle use of sign:
What kinds of messages are you going to run on the sign, and will it require full color display, or monochrome display? If monochrome, do you prefer Amber, Green, or Red?
How many characters (including both letters and spaces) should be displayed simultaneously on the sign?
Do you need the sign to be capable of graphics? Do you also need it to be capable of animations? Do you need it to be able to produce graphs? Do you need to be able to display video? You also need to determine how important picture quality is?
Live Data Feeds:
Do you want to be able to display real time feeds like financial data, sports feeds, weather statistics, news headlines?
Time and Temperature:
Are you going to want to include the tme and temperature along with your messages?