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Hello everyone! I am currently beginning my first multi-touch project, and I want to share it with you. The style of multi touch I have chosen to build is an LCD-LP, however in the event that the LCD-LP fails, I will create a Side DI.

LCD-LP stands for LCD light plane. It works by flooding the top surface of an LCD matrix with infrared light, and viewing it from beneath with an infrared camera. When you place your finger in the light plane, it reflects the light down toward the camera, and the camera (running with a program that tracks finger position a.k.a.  “blobs”), transmits it’s viewable area to the computer, the location you are touching.

So far, I have disassembled a webcam (PS3 Eye) and turned it into an IR (infrared) camera, and taken apart my LCD screen. And both still work after being reassembled!

I will be posting my pictures of the processes later, along with steps of what I did.


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