Viewing angle about 30 deg or below is the best. Not too much wide angle for sign boards.
Why is that?
When LED’S are placed in very closely to each other, if the LED has too much viewing angle the light covers the neighbor LEDs which is in the surrounding area. At this time display looks like smudged. It’s reducing the smoothness of the character or the sign.
Especially at night times.
Ready made LED matrix doesn’t have this trouble because each LED is separating by the mould (separators). So the light wont come to any neighbor LED’S. That’s why I always use matrix LED’s.
Home made LED matrix panels must use narrow angle LED’s.