Touch screen phenomenon

- Sep 19, 2018 -

The phenomenon of touch screen is that the capacitive touch screen applies transparent metal layer to the glass plate as a conductive body. There are long and narrow electrodes on the four sides of the touch screen, forming a low-voltage ac electric field in the conductive body.When the finger touches the metal layer, the contact capacitance will be changed when a conductive object touches it. The current from the four electrodes will flow to the contact. The controller can determine the position of the touch by the current.As capacitance varies with temperature, humidity or grounding, its stability is poor and drift often occurs.