Capacitive sensing in touch screens has been around since the 1970’s, but with the recent explosion in popularity of the smart phone, Multi-Touch Projected Capacitive Technology have come to the forefront of touch screen technology.
How Exactly Do They Work?
Projected capacitive touch screens have front and back protective glass providing optical and strength enhancement options. Its middle layer consists of a laminated sensor grid of micro-fine wires, and optical enhancement options.
During a touch, capacitance forms between the finger and the sensor grid. The embedded serial controller in the touchscreen calculates touch location coordinates and transmits them to the computer for processing.
Why Use Projected Capacitive Touch Screen?
• Superior Optical Clarity
Projected capacitive touch panels made with all-glass construction, which have near 100% optical clarity, makes them ideal for incorporating touch interactivity into demanding medical applications that require high-end LCDs with superior contrast, resolution, luminance and sharpness.
• Extreme Durability
Because the top layer is glass, a projected capacitive touch screen is extremely durable. It won’t deform over time or shrink from exposure to heat, and the glass can be cleaned without damaging the touch screen or decreasing its optical clarity. When assembled into a sealed enclosure, a projected capacitive touch screen can function normally even after being fully immersed in a liquid, sprayed with corrosive chemicals or struck with a hammer. As long as the top layer of glass remains intact, the touch screen will continue to operate.
• Keeping the Gloves On
Projected capacitive touch screens do not require conductive contact. This means that the user’s finger can be covered by a glove or any other non-conductive material and still be detected by the touch screen controller. Projected capacitive touch screens will also work with a stylus that can capacitively couple to the touch screen. A stylus for a projected capacitive touch screen can be made from a metal rod coated with rubber or plastic.
• Multi-touch Capability
Since projected capacitive panels have multiple sensors, they can detect multiple fingers simultaneously, which is impossible with other technologies. In fact, projective capacitance has been shown to detect up to ten fingers at the same time. This enables exciting new applications based on multiple finger presses, including multiplayer gaming on handheld electronics or playing a touch screen piano.
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