Touch Screen Technologies

Types of Touch-screen

● Capacitive

● Resistive

● Infrared Grid

● Optical Imaging

Capacitive

● Newer kind of touch screen

● You have to use a finger with it

● Relies on a change of current in the skin

Capacitive

● Made popular by Apple's iPhone and iPad

● More responsive

● More expensive

Resistive

● A mesh between the screen and the touch panel.

● Where the mesh meets the touch panel, a touch is registered.

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

Infrared

● Not common.

● A very old type of touch screen.

● Uses an array of infrared LED and detector pairs around the screen.

Infrared

● Accepts any kind of input.

● Generally used outdoors and sometimes in point-of-sales systems.

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

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