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There are different types of touch screen technology available. At QCL, we mainly use resistive touch screens on our products mainly due to their quality, price and speed.
Resistive touch screen technology is ideal for semi-supervised environments. Resistive technology uses a display overlay with a conductive coating on the interior surface. Special separator "invisible ink dots" are placed across the active area. These dots separate the interior layers. The pressure from the pointing device creates an electrical contact at the point of actuation. This then supplies the controller with the vertical and horizontal analogue voltage information to allow calculation of the point of actuation.
QCL resistive touch screens have an anti-glare coating to reduce reflections on the screen, which makes the display easier to view under different lighting conditions. Resistive touch screen technology can be used by a gloved hand, fingernail, or some form of stylus.
QCL also use Surface Acoustic Wave and Capacitive technologies on occasion. QCL specify these other types of touch screen for applications where systems are unsupervised and can be exposed to potential vandalism or particularly aggressive use. Each QCL solution is subject to site survey to ensure the most appropriate technology is utilised.
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