1. Touch Screen Technologies

2. Types of Touch-screen
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Capacitive
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Resistive
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Infrared Grid
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Optical Imaging

3. Capacitive
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Newer kind of touch screen
You have to use a finger with
it
Relies on a change of current
in the skin

4. Capacitive
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Made popular by Apple's
iPhone and iPad
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More responsive
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More expensive

5. Resistive
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A mesh between the screen
and the touch panel.
Where the mesh meets the
touch panel, a touch is
registered.

6. Resistive
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A stylus is usually used, as it
is more accurate.
Not usually multi-touch
Was proven possible in the
1970's
First consumer use was in the
Apple Newton

7. Infrared
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Not common.
A very old type of touch
screen.
Uses an array of infrared
LED and detector pairs
around the screen.

8. Infrared
●
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Accepts any kind of input.
Generally used outdoors and
sometimes in point-of-sales
systems.

9. Optical Imaging
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Relatively new
Image sensors placed in the
corners
Infrared backlights are
placed in the camera's point
of view
A touch shows up as a
shadow, cameras can
pinpoint the touch

10. Optical Imaging
●
●
●
●
Relatively new
Image sensors placed in the
corners
Infrared backlights are
placed in the camera's point
of view
A touch shows up as a
shadow, cameras can
pinpoint the touch