Industrial Smart Touch Screen Pcap are widely used in industry. And its superiority and vitality are becoming more and more prominent in the field of technology. As a bridge between industrial tablet PCs and programmers, industrial touch screens are also a topic that everyone cares about when buying. So how to choose a capacitive touch screen or a resistive touch screen?
The capacitive touch screen uses the electricity of the human body to work. The touch screen consists of a four-layer composite glass screen. And paste a layer of transparent special metal conductive material on the surface. When a finger touches the touch screen, it will form a coupling capacitance due to the electric field of the human body, the user and the surface of the touch screen. For high-frequency current, the capacitor is a direct conductor, so the finger draws a small current from the contact point. This current flows from the electricity on the four corners of the touch screen. And the current flowing through these four electricity is proportional to the distance from the finger to the four corners. The controller passes the accurate calculation of the proportions of these four currents. Get the location information of the touch point.
The advantage is that it can be multi-touch. The multi-touch capacitive screen currently used on IP can only achieve two-point simultaneous touch, and it will develop into three-point, four-point, and N-point in the future. High positioning accuracy. Disadvantages of capacitive screens: The main disadvantage is drift. When the environmental temperature and humidity change, the environmental electric field changes. Will cause the capacitive screen to drift and cause inaccuracy. Capacitive screens can only sense the touch of bioelectrical objects such as fingers. And the influence of the surrounding environment on him is fatal. If your fingers are sweaty. Capacitive screens may no longer provide you with services. If you are in a bathroom full of steam, or a sauna. Capacitive screens may be on strike. If you want to use other objects (such as stylus, toothpicks, cotton swabs, etc.) to operate the capacitive screen. He will not give you any response.
The screen body of the resistive touch screen is a multi-layer composite film. A layer of glass or plexiglass is used as the base layer. The surface is coated with a transparent conductive layer (ITO film). It is covered with a plastic layer whose outer surface has been hardened and is smooth and scratch-resistant.
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