Capacitive touch screen construction, mainly in the glass screen coated with a transparent thin film conductor layer, and then outside the conductor layer plus a protective glass, in the four sides of the touch screen are coated with narrow electrodes, in the conductive body to form a low voltage AC electric field. When touching the screen, due to the presence of the human body electric field, a coupling capacitor will be formed between the finger and the conductor layer, the current from the four electrodes will flow to the contact, and the current strength is proportional to the distance from the finger to the electrode, the controller located behind the touch screen will calculate the proportion of the current and the strength, and accurately calculate the location of the touch point.
Compared with resistive touch screens, which were common in the market at the time, capacitive touch screens have obvious advantages. Firstly, capacitive touch screens only need to be touched and do not require pressure to generate a signal, whereas resistive touch screens are activated by pressure. Secondly, capacitive touch screens have a long average life span. Again, in resistive touch screens, the top film needs to be thin enough to be flexible in order to bend down to touch the film below, so it is prone to damage, whereas capacitive touch screen covers can be thicker and protected by glass, which is scratch resistant and better protects the conductors and sensors. In addition, capacitive touch screens are more durable, less prone to ageing and resistant to high temperatures. Moreover, the capacitive touch screen's double glass design is more effective in preventing external environmental factors from affecting the touch screen, even if the screen is stained with dirt, dust or oil, the capacitive touch screen can still accurately calculate the touch position.
WIWOTOUCH has been dedicated to the research of capacitive technology for many years and has provided perfect touch display solutions for many manufacturers in different fields such as medical, automotive, industrial, marine and aviation. We have a professional R&D department that can provide you with a customized solution.
