Multi Touch

Zero Force Touch

Thu, 27 Mar 2008 05:44:36 -0500

After finally getting everything set up in the lab, I ran some tests.

I’m getting great zero force recognition on the touches. Especially when the lights are out!

When the lights are on it doesn’t work as well, but it still responds. The rear projection film that will be going on top of my mylar diffuser should fix the lighting problem.

Progress

Thu, 27 Mar 2008 03:39:04 -0500

I finally got my display set up in the lab. My friend Arvind helped me take some pictures. He took some really cool photographs.

There is a whole bunch of photos. At the end of the gallery there are also a couple of shots of the setup.

We also took some video snapshots that show the performance of the display.

Check out the gallery with all the pictures:

First Test

Fri, 21 Mar 2008 03:45:33 -0500

First Test with full hardware setup. things are still a little of and need a little calibration. The compliant surface made from thinned silicone caulk works well.

A video of the touchscreen in action:

Silicone Caulk Compliant Surface

Tue, 18 Mar 2008 04:08:09 -0500

I made a compliant surface using cheap silicone caulk thinned with toluene paint thinner.

The layer worked out really well the second time I attempted it. Here is a video with clips from the process of making the silicone:

Sketches

Fri, 1 Feb 2008 04:13:09 -0600

These are some sketches I made a while back. They are ideas for how to mount the touch screen once it is done.

I think I might have to go with something a bit more sturdy after all...

Prototype

Fri, 30 Nov 2007 05:37:00 -0600

Here are some pictures from my first prototype. There is also a video of the first FTIR effect I recorded using an old webcam.

I used a small acrylic sheet that I bought and 6 infra red LED from the University engineering store with some resistors.

The camera was an old usb webcam I had lying around. The milk jug is actually an orange juice jug.