The capacitive touch screen is a transparent special metal conductive material attached to the glass surface. When a finger touches the metal layer, the capacitance of the contact will change, causing the frequency of the oscillator connected to it to change. By measuring the frequency change, the touch position can be determined to obtain information. Since the capacitance changes with temperature, humidity or grounding conditions, its stability is poor and drift phenomenon tends to occur.
The difference between capacitive touch screen and ordinary resistive touch screen
Generally speaking, the capacitive touch screen is a human-computer interaction method that supports multi-point touch. The ordinary resistive touch screen can only perform a single point of touch.
For example: Apple iphone, Nokia N8, Nokia E7 are capacitive touch screens, which can be operated by touching the screen with both hands at the same time, browsing and zooming in webpage pictures, etc.
Nokia 5800, n97; HTC d600, s90, 5230, etc. are resistive touch screens, which can only be operated by a single point.
