What is projected capacitive touch panel

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What is projected capacitive touch panel

2015-07-03 Technology

Projected capacitive (P-CAP) technology is the new powerhouse within the market. This is the same technology that is used within iPhones and iPads etc. In 2012 P-ACP accounted for approximately 64% of the market place and will only continue to gain traction. The way this technology operates is that there are 1 or 2 parallel conductive layers that form an X-Y array of lines that make up a grid of electrodes. These X/Y intersects are then scanned continuously. An electronic field is actually projected through the top layer of glass so the energy is creating an electro static field. When a finger becomes close or touches the top of the surface the change in electrodes will be detected which will then calculate where the initial touch was made.(see figure)

Each technology has its own benefits and limitations depending on the intended use. The top layer is usually a durable scratch resistant glass. The projected capacitive technology is capable of 2-10 multi-touch simultaneously depending on the controller being used. The touch coordinates will remain drift free, precise position location. The lighting is excellent with a light transmission of 90% or more. The technology also allows for a zero-bezel deign, there is no need for any additional housing unit. One of the more prominent features is the auto-calibration. The disadvantage is the higher cost as opposed to the other technologies.


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