Comments on: DIY LED Multi-touch panel

By: Thomas Pototschnig

Thomas Pototschnig — Sun, 27 Jan 2008 11:07:36 +0000

Hi all,

thank you for your positive feedback.

I released all information (Source, Schematic, Board) under the GPL V2.

regards
Thomas

By: Jeff

Jeff — Fri, 21 Dec 2007 11:44:02 +0000

Happy Christmas to All!

By: salsa

salsa — Wed, 19 Dec 2007 04:03:56 +0000

Interesting-- Apple filed for "An integrated sensing display" patent in 2004:
http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220060007222%22.PGNR.&OS=DN/20060007222&RS=DN/20060007222

By: crgwbr

crgwbr — Tue, 18 Dec 2007 20:36:30 +0000

hmm…makes me wonder is you could use a modded OLED screen in the same manner. this would give you an actual touch screen instead of touch panel.

By: Solenoid

Solenoid — Tue, 18 Dec 2007 07:46:58 +0000

This reminds me of the Tenori-on.

http://www.global.yamaha.com/design/tenori-on/

By: kyle

kyle — Tue, 18 Dec 2007 01:42:41 +0000

Check out this:
http://translate.google.com/translate?hl=en&langpair=de%7Cen&u=http://natebu.wordpress.com/

By: Ross

Ross — Tue, 18 Dec 2007 00:35:34 +0000

Reminds me of the monome project:
http://monome.org

By: Thomas

Thomas — Mon, 17 Dec 2007 23:05:28 +0000

With a report rate of around 40ms for an 8×8 array that covers 6″. It would require multiple chips to do parallel capture for scaling it up to a 20″ monitor and getting a reasonable touch and feel.

By: Wolf

Wolf — Mon, 17 Dec 2007 22:58:15 +0000

To Groxx:

I'm not sure that having the led's on or off would make any difference. At first I was thinking the same thing. (that is was detecting the reflected light), but I don't see how it would be possible to have an led on and detecting simultaneously (i mean literally simultaneously, not pulsed or
anything) which would mean that there'd never be any reflected light during its sampling time, which leads me to believe they'd have to detect using ambient only.

By: Off_topic

Off_topic — Mon, 17 Dec 2007 21:24:21 +0000

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By: cbm5

cbm5 — Mon, 17 Dec 2007 21:10:18 +0000

haha….he was unhappy that nyu only posted a demo video and no details. so he makes his own version from scratch…and only posts a demo video and no details. that’s hilarity right there.

By: rj

rj — Mon, 17 Dec 2007 20:02:32 +0000

I (tried to) implement jhan’s matrix for a class and found that i had horrible issues with crosstalk from other LEDs in the same column (which is OK if you have low ambient light in the receptive band for your photoelectronic element like in his video, but it wasn’t true for the red or green leds i was trying).

By: Bob

Bob — Mon, 17 Dec 2007 19:04:27 +0000

Wolf;
This looks like it could be modified to be on/off indicator and switch. Would take multicolor leds and use them as a toggle indicator, one color for on and the other for off, delay state change(debounce) in software.

By: Sanjay

Sanjay — Mon, 17 Dec 2007 17:15:55 +0000

Surely you could just alternate rapidly between input sensing and doing light output to emulate bi-directional input/output from the panel? Imagine an LED table that was as dense with LEDs as this panel is, and had multi-colour LEDs that reacted to objects atop the table?

By: Mike Nelson

Mike Nelson — Mon, 17 Dec 2007 17:12:26 +0000

i would assume its scalable if it’s the LED’s picking up the IR light being reflected off your fingers.. he also said it works independently of most ambient light so, lights on or off wouldn’t matter. you could scale up if you could manage to maintain precision… that looks really cool either way, props man.