If one wants to make a simplistic “screen” with light sources (LED, LCD, EL) in a matrix structure, how can you calculate what the distance between the dots should be, if you can no longer distinguish from a given distance between the points of light? Is there a general formula for this?
Answer
Hi Martin,
The eye can distinguish details up to 1 arc minute. This means that you can see details of up to about 0.3 mm at 1 meter. If you stand at 10m, it will be 3mm.
If you want to build up an image with separated dots (eg LED, LCD …) you have to count on a loss of quality of about 25%. At that moment you have to use pixels of 3*0.75=2.25mm.
These numbers are guide numbers for people with normal good vision and when the screen is in the center of the field of view.
For large screens at events, it is accepted that people close to the different pixels can still distinguish.
Kind regards,
Luc.
Answered by
ir Luc Bosmans
Technology in the audiovisual sector
Industrial quay 170 B-1070 Brussels
http://www.erasmushogeschool.be/
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