Surface capacitive touch panels are generally used on larger panels. In these panels, a transparent electrode film (electrode layer) is covered on the glass substrate, and a protective film is covered on it. Voltage is applied to the electrodes at the four corners of the glass substrate to generate a uniform low-voltage electric field on the whole panel. The position coordinates of finger touching the screen are determined by measuring the changes of electrostatic capacity at four corners of the panel.precisely because industrial touch panel pc The rapid development of, so also brought new opportunities to the industry. https://www.innodapc.com/
Surface capacitance
Although this type of capacitive touch panel has a simpler structure than the projection capacitive touch panel, so its cost is lower, it is structurally unable to detect two or more points (multi-touch) at the same time.
Projection capacitive touch panel
Projection capacitive touch panels are usually used for screens smaller in size than surface capacitive touch panels. They are of particular interest to mobile devices. IPhone, iPod Touch and iPad all use this method to achieve high-precision multi-touch function and high response speed.
The internal structure of these touch panels includes a substrate with an IC chip for processing and calculation, and countless transparent electrodes are covered on the substrate to form a special pattern. The surface is covered with insulating glass or plastic film. When the finger is close to the surface, the electrostatic capacity between multiple electrodes changes at the same time, and the position where contact occurs can be accurately identified by measuring the ratio between these currents.