Touch Screen
A
touch screen is a
input device that allows the user to interact with the
computer by touching the
display screen.
Often this uses
beams of infrared light that are projected across the screen surface.
Interrupting the beams generates an electronic signal identifying the location
of the screen. Software interprets the signal and performs the required
operation.
The HP 150
was among one of the world's earliest commercialized touch screen computers. It
actually has not a touch screen in the strict sense, but a 9"
Sony
CRT surrounded by
infrared
transmitters and
receivers which detect the position of
any non-transparent object on the screen.
by-http://encyclopedia.fablis.com
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