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Touch Screens

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    • 1. Touch Screen Technologies
    • 2. Types of Touch-screen ● Capacitive ● Resistive ● Infrared Grid ● Optical Imaging
    • 3. Capacitive ● ● ● Newer kind of touch screen You have to use a finger with it Relies on a change of current in the skin
    • 4. Capacitive ● Made popular by Apple's iPhone and iPad ● More responsive ● More expensive
    • 5. Resistive ● ● A mesh between the screen and the touch panel. Where the mesh meets the touch panel, a touch is registered.
    • 6. Resistive ● ● ● ● 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 ● ● ● Not common. A very old type of touch screen. Uses an array of infrared LED and detector pairs around the screen.
    • 8. Infrared ● ● Accepts any kind of input. Generally used outdoors and sometimes in point-of-sales systems.
    • 9. 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
    • 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