Custom Keyboards and Input Devices - INDUKEY - #10

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57 www.custom.indukey.com Technologies Touchscreens Phone: +49 (0) 37468 - 650-0 | info@indukey.com The technology at a glance - Resistive A customized touchscreen requires two layers of an ITO sputtered base material, which are separated from each other by means of spacers. ITO stands for indium tin oxide, which is an almost transparent, but conductive material. Sputtering refers to a special method for depositing thin films. Suitable base materials for ITO films are foil or glass. When pressing the top layer, a conductive connection between the upper and lower ITO layers is established at the pressed point. The position of the contact point is identified by an analytical circuit. Application examples • Computer technology: note pads, information terminals • Multimedia: information systems, POS consoles and internet terminals • Medical engineering: patient monitoring systems • Industry: process monitoring, control panels, process visualization systems • Toys industry: interactive games Important technological advantages • Flat design; no parallax errors • Can be operated with any kind of soft object, e.g. finger, pencil tip • No drift and thus no calibration required • Surface soiling does not affect functioning • Analogue or digital principle available • Main dimensions can be freely selected • Terminal lug is based on copper conductor tracks • Through-connection on the terminal lug is possible – all connections on one side • High light transmission • Scratch-proof surface coating Intuitive operation - Capacitive In case of digital touchscreens, thin isolating channels are created in the ITO layers in order to produce conductive tapes. As the tapes of the upper and lower ITO films are positioned at an angle of 90° to each other, a key matrix is created.In case of the analogue principle, the ITO layers are not cut. Contact to the upper layer is applied vertically and laterally on both sides – to the lower layer horizontally. The short-circuit point of the two layers is determined by the voltage divider using a complex evaluation electronics. i