MultiTouch
MultiTouch computing research and development
This blog documents interesting and useful research that is being done among individuals, hobbyists, students and myself in MultiTouch computing. Also discussed and shared are programming technologies, code etc.
23rd
JUN
My First LCD FTIR Project Completed
Posted by Nasir Aziz under MultiTouch
So finally I was able to complete my first LCD FTIR Multi Touch Screen project. Once I gathered all the materials listed in the previous post, the housing of it all became an issue quickly. Meaning I didn’t want to initially set this up as a table top. I kind of wanted to have this on my desk so that I can play with it like a regular desktop computer setup.
Anyway, after some thought and an available resource, assembling and putting this whole setup together became clearer. I had an old Sony Trinitron 19″ CRT lying around at the house. Works but yeah who uses CRTs anymore? So I gut the whole thing out and left just the shell, meaning the body of this old and about to be recycled monitor.
Size and depth wise it turned out to be perfect for housing all of the LCD components. WebCam went all the way in the back. In front I attached Acrylic Sheet surrounded by IR LEDs in the inside followed by LCD, then LCD plexi type base, a diffuser that came with it plus original backlight tubes. The LCD power and other components were attached to the shell ceiling. Well it did take a little while to plan this out but was definitely faster than building the table for it.
After long hours of putting this together, it ended up looking like an actual regular monitor - except it ain’t.
Here are some pics with some descriptions and then the video in the end.
Sacrificial LCD has been identified:
Operation LCD begins:
Getting closer:
Hmmmm, more layers to peel off:
Aha, so this is what it really looks like. Seems like all the circuits can be folded, we are good to go:
Sony Trinitron 19″ CRT Monitor case, to be used as housing for this project. Camera was initially mounted with the tape just to test the depth and view. Final version has it mounted on ceiling in the same fashion but properly with base glued on a mount etc.
The end product, doesn’t it look like just another regular good old CRT Monitor?
Ok, enough with the pictures, lets see the results:
Already thinking about improvements and a new Projector based MT project.
Stay tuned…
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June 23, 2008 -
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hello, friend, the English excuse is that I am using a translator!
Friend Is making a Multi-Touch Screen without opening the LCD monitor! if possivél details for me be very Thanks! Initially you use in a display of 7 inches
Nice , working on a setup much the same except for mounting it in a sealed acrylic box.
What did you use to back light the LCD matrix? Did you have any problems with the ir not passing through?
I was thinking of using an ultra bright white LED array for back lighting.
You can use the UltraBright LEDs but I havent tried that. I used the original backlight FLs that came with the LCD. They are like bright light LEDs and do not emitt any IR at all and work as they are intended too.
The Blobs pass through just fine, as you can see. I’ll post some videos of improved version and some of the blobs too.
Hello!
You got a realy nice setup there!
I was wondering about the apps you where showing in the video, where have you found them?
Mvh
Jan Anders Ekroll
Hey thanks.
I got the apps from http://www.multigesture.net/
I was wondering if you could send me a little how to because i want to build one like yours but dont have alot of money to experiment alot.
you can mail me
gabriel at septembre dot com
thanks
Gabrielgb
Hello!
Awesome casing you’ve got here… We are making just this project but we’ve run into a bit of a problem: The backlighting of our LCD panel.
The LCD monitor we unassembled to be used brought an FL lamp the size of the panel. If we put a, say, sandwich arrangement (all layers parallel to one another) of:
Lamp - LCD - Acrylic
With the camera between the Lamp and the LCD, we find that the back of the LCD panel is EXTREMELY reflective, rendering the whole model useless.
We have been trying putting the FL light at 90º from the LCD panel, but the illumination isn’t quite right.
How did you managed to get the illumination so even and bright?
Thanks a lot!
@Francisco González
I actually attached the FLs exactly how they were originally. Meaning the exact same way as they come attached on the sides of LCD as assembled by factory. That basically gave me the same exact even illumination as designed and intended.