A capacitive touch screen is a panel of glass coated with a special transparent conductor such as Indium Tin Oxide. A small voltage is applied to the layer resulting in an electrostatic charge. Because the human body an electrical conductor, touching the screen results in a distortion of the panel’s electrostatic charge.
When a finger touches the surface, a capacitance is formed at that location. Sensors located at each corner of the panel will measure the frequency variations to calculate the coordinates of the user’s touch. The coordinates are then fed back to the controller which translates this information in to something that allows software on an operating system to understand.
Capacitive touch screens have no moving parts and are impervious to grease, dirt and water making them an ideal interface for outdoor Kiosks.
Impulse has an extensive range of capacitive touch screen Panel PCs and Industrial Displays. For more information on our capacitive touschcreen range, contact our Technical Account Managers on +44 (0)1782 337 800 or alternatively email sales@impulse-corp.co.uk.
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