Peripherals/Touch Screen
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Technology
Different touch screen technologies:
- 4-Wire Resistive
- 5-Wire Resistive
- Capacitive
- Surface Acoustic Wave
- Infrared
- Strain Gauge technology
- embedded ccd in panel - can't find link but light detectors can be intermixed with light generators, maybe on an oled display, so the computer can detect when light reflected
- A simple light sensor could also work as a display pointer. A tethered pen could detect flashed target boxes, like the old Nintendo Light Gun. For continuous drawing, the screen could flash through a series of patterns where the pen either sees light or dark. Each screen location would thus have a unique binary code flash through it, which would be reported by the pen's narrow light sensor. This screen scan will start in a small box near where the pen was last to reduce search time, and the eyesore of flickering. -- Nintendo wii remote has been hacked to provide multi touch interface-- http://gizmodo.com/gadgets/clips/wiimote-hack-is-wireless-multitouch-tv-321329.php
Apparently most PDA’s use 4-Wire Resistive touch screen technology. However I am not positive on this.
Adding a Touch Screen to the XO
The XO has a 7,5 inches display, so is quite hard to find. An alternative is to buy an 8 inches no wide touch screen, I have bougth mine at http://www.iiic.hk.cn/ Then you have to open the XO computer and remove the screws in the lcd corners, then remove the rubber over them to obtain more space between the top plastic and the display. The touch screen comes with an usb controller, that we soldier inside the XO USB port as you can see in the pothograph. We could obtain some free space, over the display as you can see in the photograph.
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