LED Marker board

I want to build a LED writing board.

It's basically a markerboard with a LED light behind it and it takes advantage of special fluorescent markers.

My question is, how can I achieve that the board doesn't light up unless the marker is applied to the board. You can see in the video, that the glass stays black/dark until you write on it... How does that work?

http://www.youtube.com/watch?v=pQwdWvGIq5A

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macformat3 years ago

hi, I think there's no much secret or science involved. I need to make one , but I don't know why are quite expensive (around 120 USD in Mexico)

the elements I discovered is RGB led Stripe (5 USD /Meter) RGB Controller with remote (8 USD) and 12v 1Amp supply (4 USD) and build a frame with aluminium profile (like the used in windows).

the frame is layered at the bottom with black opaque cardboard or similar, so I think the effect you say is the light is reflected on the flourescent ink printed on the glass surface. Is just that.

Hope that helps to answer.

Tuteja6 years ago
Led marker boards are side lit or back lit? Can we use normal LEDs or need uv LEDs. Sorry.. Do u have instructions to create led marker board or anywhere on the web ... Thanks.....Ip
CSMx (author) 7 years ago
Thank you for you reply, its a good explanation.

BTW. Can you tell me what kind of UV LEDS are used, because I learned there are some types of UV LEDS that can harm you eyesight....
Also I like to learn more about those glass filters which block most of the visible radiation and let the UV pass through...

lemonie CSMx7 years ago
You can get just under 400nm UV LEDs fairly easily, they're not dangerous unless you spend time staring at them. The dark glass makes the thing look better, but you get pretty much the same effect in low-light without.

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CSMx (author) 7 years ago
I found out that 'Woods Glass' does the job, but it is not really for sale and very expensive.
lemonie7 years ago
If it's UV backlit, with a visible filter, all you "see" is UV, except you don't because that's outside of your visual range.
Apply fluorescent marker and it fluoresces, the UV energy is redistributed and most of it converts to visible.

UV backlight, glass

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