Selecting the proper display must therefore be based on the requirements for visual communication.
What kind of information is to be displayed to viewers? There is a huge difference in the requirements between a display in the airport directing passengers to the right gate and the display used in the boardroom, viewing spreadsheets, graphs, product details etc...
So, what are the fundamentals?
Firstly: the amount of information in one single image.
How much information is to be viewed at the same time?
This will normally be determined by the application; the examples above are typical. The basic requirement is that all information should be ‘perceivable’.
When it comes to text, this is a matter of the size of the typeface in relation to the viewing distance. The more information and the smaller the font used in the image, and then the shorter the viewing distance required.
Resolution is another way of describing the amount of information in a display.
The more information that is needed, the higher the required resolution.
This leads to the next fundamental, the size of the image.