The main classification of touch screen and its working principle

- Oct 26, 2018-

Although we often see or touch the touch screen, but is not in the industry, really do not know how it can be run through finger touch.Today with xinheichang editor to understand it.

How many types of touch screens?Taken together, they fall into five main categories.


From the technical principle to distinguish touch screen, it can be divided into five basic categories: vector pressure sensor technology touch screen, resistance technology touch screen, capacitance technology touch screen, infrared technology touch screen, surface acoustic technology touch screen.One of the vector pressure sensor technology touch screen has been out of the history stage.The infrared screen of the touch screen is low in price, but its outer frame is fragile and easy to produce light interference.The theory of capacitive screen design is good.The resistance screen is accurately positioned, but the price is high and it is not vulnerable to scraping.Surface acoustic touch screen solves all kinds of defects of previous touch screen. It is clear and anti-violent and suitable for all kinds of occasions. The drawback is that water droplets and dust on the surface of the screen will make the touch screen dull and even not working.According to the working principle of the touch screen and the medium to transmit information, we divided the touch screen into four types, they are respectively resistive type, infrared type, capacitive induction type and surface acoustic wave type.

How does the touchscreen work?For ease of operation, people use touch screen instead of mouse or keyboard.To do so, we must first touch the touchscreen mounted on the front of the display with our fingers or other objects, and then the system can locate and select input information based on the finger's icon or menu position.The touch screen consists of touch detection component and touch screen controller.The touch detection part is installed in front of the display screen to detect the user's touch position, which is accepted and sent to the touch screen controller;The main function of the touch screen controller is to receive touch information from the touch point detection device, convert it into contact coordinates, and send it to CPU, which can receive and execute commands from CPU at the same time.