A touch screen (Touch Panel) is an input device that allows users to perform interactive operations by touching gestures directly on the screen. It integrates sensor technology and display technology to detect and locate the user's touch actions and convert them into corresponding command signal. Touch screens are widely used in various electronic devices, such as smartphones, tablet computers, ATM machines, POS machines, industrial control equipment, information query terminals, and interface control of embedded systems.
Touch screen technology can be divided into many types based on different working principles, such as:
Resistive touch screen: Uses pressure sensing to change the contact between the upper and lower conductive films to determine the touch location.
Capacitive touch screen: Uses the change in capacitance formed by the human body and the screen to detect touch points. It is common in modern smartphones and tablets.
Infrared technology touch screen: The infrared transmitting and receiving devices arranged around the screen detect the position of the touching object blocking infrared rays.
Surface Acoustic Wave (SAW) touch screen: Positioning is performed by utilizing the characteristics of sound waves being disturbed by touch during propagation on the screen surface.
Projected Capacitive Touch (PCT): Mostly used in advanced devices that support multi-touch and can sense multiple simultaneous touch events.
Because of its intuitive and convenient interaction methods, touch screens greatly improve user experience and reduce reliance on physical buttons. They are widely used in consumer electronics, industrial automation, public service facilities and many other fields. As technology advances, the response speed, accuracy and durability of touch screens continue to improve, making them an indispensable part of modern electronic devices.
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