Hi all,

Last week I went to a sign expo and was looking at a *giant* (prob >15=20
ft horizontal) LED display screen, as would be used for advertising.  It=20
was made up of individual red, green and blue LED's in a grid.  But I=20
noticed that in every grid "square" two diagonal LED's were red, and the=20
others were one green and one blue -- ie: there were twice as many red=20
LED's as green or blue.  But the image colors seemed normal to me.

So why more red?...
Is it possible that the eye perceives red less?  Perhaps over a long=20
distance?
Is brighter/more red used to make more stand-out advertisements?
Did they just fill the grid spaces and reduce the brightness of the red=20
LED's?
Or...?

Cheers,
-Neil.


--=20
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