Touch Screen Devices

Touch screen devices can operate on any of the following 7 specific technologies. Each technology fundamentally does the same thing yet some carry advantages and disadvantages. In this article we will talk about the different technologies that you will see in common touch screen devices.

1. Resistive

Resistive touchscreen displays are basically a layering process that uses thin layers of plastic and metallic layers. These metallic layers are electrically conductive and when they contact each other it changes the electrical current. This allows the plastic layers to used as part of the display and yet give it the ability to detect touch.

2. Capacitive

Capacitive touch screen devices use glass coated with a conductive metallic layer. This metal is charged with an electrical current and there for has an electrical field. When a human finger touches the glass it disrupts the electrical field and this can be detected. Microprocessors can calculate touch using this disruption point and the XY coordinates and the touch screen display quickly responds.This touchscreen technology is often seen in multi-touch devices like the iphone.

3. Surface acoustic wave (SAW)

Touch screen devices are not often seen using this technology. Surface acoustic technology uses ultrasonic waves passed over the device. When these ultrasonic waves are disrupted the processor can detect the changes and calculate the touch point. This technology is just not yet stable enough for manufacturing in touch screen devices.

4. Infrared

These touch screen devices use an optical technology that uses light to sense touch. at multiple point LED lights are pointed directly at photo sensors. Any interruption of light passing from the LED to the photosensor would be sensed and processed. Touch screen devices do not currently use this technology because they do not perform well in bright ambient light. This technology is also expensive with no real benefits over any of the other touchscreen displays.

5. Dispersive signal technology

This technology can only detect mechanical energy in glass. When the glass has a flex in the surface the change can be detected. Touch screen devices that capture the imagination use motion of the finger to allow us to interact with our apps. Resistive and capacitive detect motion yet dispersive signal technology does not.

6. Optical imaging

Optical imaging uses image sensors and multiple cameras to detect the change in infrared light to calculate the point of touch. This may be an affordable solution to touch screen devices in the future. Advances in processors will allow this technology to blossom but currently is not seen in many touch screen devices.

7. Acoustic pulse recognition

This touch screen technology uses vibration to be detected by piezoelectric transducers. The transducers then send a signal to the processors and then the point of contact can be calculated. This is often seen in large touch screen devices and can handle wear and tear. Combinations of this technology and others may pay off in the near future and is currently being researched

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