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TouchScreens, are they all the same? No. There are many different types and sub-types. They all have advantages and disadvantages. What may surprise you is simply buying the most expensive is not the way to get you the best touchscreen for your use. Some technologies are better for optical clarity, others for chemical resistance. Below you will find a brief explanation of the different technologies and some of their pros and cons. Acoustic Pulse Recognition: Consisting only of a glass overlay and controller board. It works by recognizing the sound created when the glass is touched at a given position. Four-Wire Resistive: Using a glass back layer of glass with an overlay of polyester coversheets with 4 wire mesh embedded into it. When pressed it detects the screen location using electrical resistance. Five-Wire Resistive: Has a the same design as Four-Wire A fifth wire is added to an additional layer to improve durability and stability. When pressed it detects the screen location using electrical resistance. Infrared: Infrared is the only touch screen technology that does not use on overlay or substrate. It uses infrared sensors on the edge of the display to sense your finger location. Surface Wave: Has a glass overlay and using a ultrasonic wave to vibrate the glass to detect your touch. Secure Surface Wave: Same as Surface Wave but adds vandal resistant extra-tough glass substrates Multi-Touch Surface Wave: Same as Surface Wave but adds multi-touch. Projected Capacitive: Using a glass overlay with a capacitive coating on the back of the glass to detect the touch. Surface Capacitive: Using a glass overlay with a capacitive coating on the glass to detect the touch.
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