Peripherals/Touch Screen: Difference between revisions

Revision as of 04:13, 15 November 2007

Different touch screen technologies:

4-Wire Resistive
5-Wire Resistive
Capacitive
Surface Acoustic Wave
Infrared
Strain Gauge technology
A simple light sensor could also work for a touch screen. 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.

Apparently most PDA’s use 4-Wire Resistive touch screen technology. However I am not positive on this.

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 * [http://docs.paperless-school.com/Infrared Infrared]
 * [http://docs.paperless-school.com/StrainGaugeTechnology Strain Gauge technology]
-* A simple light sensor could also do some light work. 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.
+* A simple light sensor could also work for a touch screen. 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.
 Apparently most PDA’s use 4-Wire Resistive touch screen technology. However I am not positive on this.