Various types of touch screens

The touch screen can be divided into five basic types from the technical guide: vector stress sensing technology touch screen, resistance technology innovation effect display, capacitive technology touch display screen, infrared technology effect display, work surface acoustic wave technology innovation touch display. <Recommend For 7 inch touch screen, we have different models for customers choice such as 800*480, 1024*600, 800*1280, normal brightness and high brightness.> According to the working principle of the touch screen and the medium for transmitting information, there are four types of touch screens: resistive, capacitive, infrared and surface acoustic wave. Below we introduce four kinds of touch screens according to the working principle of the touch screen and the medium of transmitting information.


1. Resistive touch screen


Resistive touch screen is a kind of sensor, which is basically a structure of film and glass. The adjacent surfaces of the film and the glass are coated with an ITO coating. ITO has good conductivity and transparency. During the touch operation, the ITO of the lower film will contact the ITO of the upper glass, and the corresponding electrical signal will be transmitted through the sensor, and then sent to the processor through the conversion circuit, that is, the point is completed by calculating and converting the X and Y values ​​on the screen. The selected action is displayed on the screen.


The main advantage of the resistive touch screen is that its screen and management procedures are relatively cheap, responsive, not afraid of dust and water vapor, and adapt to different unpleasant conditions. It can be in contact with any object and has good stability. The advantages of resistive touch screens can be divided into the following categories: 1. The resistive touch screen has high precision, can reach the pixel level, and the maximum applicable resolution can reach 4096x4096. 2. The screen is not affected by dust, moisture and oil. , It can be used in a lower or higher temperature environment. 3. The resistive touch screen adopts pressure sensing, which can be touched with any object, and even gloves can be used for handwriting recognition. 4. The resistive touch screen technology is mature, the threshold is low, and the price is relatively cheap.


The problem is that the external motion image of the resistive touch screen will definitely be destroyed, and the touch screen cannot be used. The multilayer structure will cause a large amount of light loss. For handheld devices, it is usually necessary to add a backlight to compensate for the poor light transmission, but this will also increase battery consumption. The shortcomings of resistive touch screens can be divided into the following categories: 1. Resistive touch screens can be designed to be multi-touch, but when two points are pressed at the same time, the pressure on the screen becomes unbalanced, resulting in touch errors. Touching The degree of realization is more difficult. 2. The resistive touch screen is more likely to damage the touch part of the screen due to scratches and other reasons.


2. Capacitive touch screen


The capacitive modern technology touch screen uses the existing induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface of the glass screen and the interlayer are coated with a layer of ITO. The outermost layer is a thin protective layer of quartz glass. The working surface adopts interlayer ITO coating, leading out at four corners. Four electrodes, the inner layer of ITO is a shielding layer to ensure a good working environment. When a finger touches the metal layer, a coupling capacitance is formed between the user and the surface of the touch screen due to the electric field of the human body. For high-frequency currents, capacitors are direct conductors, so a finger draws a small amount of current from the contact point. This current flows from the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point by accurately calculating the ratio of these four currents. .Capacitive touch screens only need to be touched and can generate signals without pressure.


Features of capacitive touch screen: 1. After the capacitive touch screen is produced, it only needs to be calibrated once or does not need to be calibrated. 2. The life of the capacitive touch screen will be longer. 3. Capacitance technology is superior to resistance technology in terms of light loss and system power consumption. 4. The capacitive type can be used for large-size touch screens, and the comparability is low. 5. Capacitive technology, wear-resistant, long life, low maintenance cost when users use it. Capacitive touch screens can support multi-touch technology, which is different from resistive touch screens

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