I'm preparing for a project which is an LED sign, it will be an LED matrix, but only have the necessary LEDs attached so it will only display one "word" but each individual LED of the WORD can be controlled for nice patterns etc.
In the image below tracks run horizontally. As can be seen, a single LED obscures 3 holes in its width, and one space must be left above each LED.
Ignore tracks in the image above, it's merely to show spacing and not electronic contact.
Now I have received my LEDs and measured properly, the real dimensions I require are as follows: 114 LEDs wide, 28 LEDs high
342 Holes wide (min) 84 Strips high (min) 80cm wide (approximately calculated minimum) 23cm high (approximately calculated minimum)
The board doesn't have to be copper type vero/proto/matrix, it can be plain, but I need something that will rigidly hold the LEDs evenly spread so I can wire them up how I need off the board if necessary. It doesn't have to be one piece, but I do want to achieve even spacing, cost is an important factor in the choice.