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.consequently industrial touch panel pc I also got a lot of attention and wanted to join the ranks. https://www.innodapc.com/
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.
Projection capacitance
A unique feature of the projected capacitive touch panel is that a large number of electrodes can accurately detect the contact of multiple points (multi-touch). However, the indium tin oxide (ITO) projection capacitive touch panel used in smart phones and similar devices is not suitable for large screens, because a larger screen size will lead to an increase in resistance (that is, the transmission speed of current will slow down), thus increasing the error and noise of touch point detection.
The larger touch panel adopts a center line projection capacitive touch panel, and very thin wires are laid in a grid as a transparent electrode layer. The lower resistance makes the center line projection capacitive touch panels have extremely high sensitivity, and they are more suitable for mass production than ITO etching.
In the above, we summarized the differences between the two types of capacitive touch panels. The common feature of these panels is that, unlike resistive touch panels, they do not respond to the touch of clothes or standard stylus. They have excellent dust-proof and drip-proof properties, and high durability and scratch resistance. In addition, its light transmittance is also higher than that of the resistive film touch panel.
On the other hand, these touch panels need to be operated with fingers or special stylus. They can’t be operated when wearing gloves, and they are easily influenced by nearby metal structures.
