Concepts of Touch Screen Mobile Phones

Concepts of Touch Screen Mobile Phones

The concept is all the same as touchscreens apply the technology that allows detection of touch of the display of a device. There are various touchscreen technologies depending with its construction and mode of transmitting the touch signal to the controller for processing. Here are some:

• The Resistive that has several layers and resists outside forces like liquids, dust.
• The Surface Acoustic Wave using ultrasonic waves and when touched, wave absorbed sends position of touch.
• The Capacitive uses charges from the human’s ability as a conductor.
  • The Surface Capacitance where one side has a conductive layer and the other does not, and when this side (uncoated) is touched, a capacitor is thus formed and sends position to controller for processing.
  • The Projected Capacitance where a series of rows and columns of conductive stuff layered on the sheet of glass.
• The Infrared that uses infrared LED and photodetectors.
• Optical Imaging uses image sensors.
• Acoustic Pulse Recognition using sound that is generated distinctly when display is touched.
• There is also Mutual Capacitance, Self Capacitance, and Dispersive Signal Technology.