Electronics > Projects, Designs, and Technical Stuff
Massive dot-matrix LED sign, need help picking a technology
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mkschreder:
Why don't you just place a projector somewhere up high and then correct for sideways projection (since it will be looking at an angle towards the field). I think there are projectors that use some form of laser light that can produce a sharp picture from a distance. At least it works on buildings. However for your application I'm thinking a projector mounted up high like on a cell tower or a tall building. Or perhaps on your plane?

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mkschreder:

--- Quote from: mkschreder on March 31, 2019, 08:11:00 pm ---Why don't you just place a projector somewhere up high and then correct for sideways projection (since it will be looking at an angle towards the field). I think there are projectors that use some form of laser light that can produce a sharp picture from a distance. At least it works on buildings. However for your application I'm thinking a projector mounted up high like on a cell tower or a tall building. Or perhaps on your plane?

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--- End quote ---
https://www.google.com/search?q=projector+from+building+to+ground&safe=off&client=ms-android-samsung-gs-rev1&prmd=ivsn&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi_jdGml63hAhVhoYsKHXf_BlAQ_AUoAXoECGUQAQ&biw=360&bih=612

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The Soulman:

--- Quote from: mkschreder on March 31, 2019, 08:11:00 pm ---Why don't you just place a projector somewhere up high and then correct for sideways projection (since it will be looking at an angle towards the field). I think there are projectors that use some form of laser light that can produce a sharp picture from a distance. At least it works on buildings. However for your application I'm thinking a projector mounted up high like on a cell tower or a tall building. Or perhaps on your plane?

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--- End quote ---

Been there done that, at night.
In daylight with today's technology it would take stupid amount's of power and $ to project anything readable.

You have better chances with even the cheapest (coarse pixel) Chinese video walls.
GigaJoe:
is some sort of acrylic letters with backlit would be a cheapest , i think a single panel  of acrylic 1.5 mm 260 cm x 80cm around $40-60
static letters, nothing fancy
Nusa:
There's always the old-school way. Gather up a lot of the victims friends and family and give them all contrasting poster-size boards and some same-day training from some guy with a megaphone who has comms with you. Even if a few of the people screw up their pixels, it should still work.
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