Working Principle and Precautions of Multi Touch Screen

The multi touch screen can perfectly realize various multi touch applications such as picture scaling and rotation, and has all the functions and advantages of the traditional single point infrared touch screen. The working principle of multi touch screen is not complex. It is mainly divided into two parts: one is to collect multi-point signals at the same time, and the other is to judge the significance of each signal. When using a multi touch screen, you should try to maintain a clean environment. Next, let's take a look with Xiaobian.

Introduction to the working principle of multi touch screen

The infrared multi-point touch screen uses the infrared matrix densely distributed in the X and Y directions to detect the operator's touch action. The infrared multi-point touch screen needs to install a circuit board outer frame in front of the display. The circuit board is arranged with infrared transmitting tubes and infrared receiving tubes on four sides of the screen to form a horizontal and vertical cross infrared matrix one by one. When the user touches the screen, his finger will block the horizontal and vertical infrared rays passing through the position, so he can judge the position of the touch point on the screen. Any opaque object can change the infrared on the contact to realize multi-point touch screen operation.

The task of multi touch can be divided into two aspects: one is to collect multi-point signals at the same time, and the other is to judge the meaning of each signal, that is, the so-called gesture recognition. Compared with the touch technology that can only accept single point input, multi touch technology allows users to touch the display screen at multiple places at the same time, so that they can zoom and rotate web pages or pictures.

In order to realize the multi touch function, the multi touch screen adopts a completely different structure from the single touch screen. From the outside of the screen, the single touch screen has only a few signal lines, while the multi touch screen has many leads; Internally, the conductive layer of the single touch screen is only a flat plate, while the multi touch screen is divided into many relatively independent touch units on the flat plate. Each touch unit is connected to the external circuit through independent leads, and all touch units are arranged in a matrix on the board. In this way, when the user's finger touches a part on the screen, a signal will be output from the corresponding detection line. When the finger moves to another part, it will output a signal from another detection line.

What should I pay attention to when using multi touch screen

1. The first is that the display resolution of the system is not easy to change from time to time, because each time the screen size is adjusted, there will be inaccurate clicking or drift. What should we do in case of such a situation? Just restart the machine and let it choose to relocate by itself.

2. For the touch screen display, it shall be used in a clean and dust-free environment as far as possible. The dust on the surface of the touch screen display shall be cleaned in time. If it is not cleaned for a long time, when the dust covers the reflection stripes or transducers around the touch screen, it will affect the correct positioning of the system.

3. Do not allow water droplets or other soft things on the surface of the touch screen to stick to the surface, otherwise the touch screen is easy to mistakenly think that there is hand touch, resulting in inaccurate surface acoustic wave screen. In addition, when cleaning the dirt on the touch screen surface, you can carefully wipe it from the center of the screen with a soft dry cloth or detergent, or clean the touch screen surface with a dry soft cloth dipped in industrial alcohol or glass cleaning solution.

4. If the touch screen reacts slowly when touching the surface acoustic wave touch screen with hands or other touch objects, it indicates that the touch screen system is very old, the internal clock frequency is too low, or there are water droplets moving on the touch screen surface. In order to restore the rapid response of the touch screen, the system must be replaced or upgraded, Or wipe the water drops on the surface of the touch screen with a rag. Generally, this situation may be common for multi-point touch screens, but pay attention to maintenance.

Working Principle and Precautions of Multi Touch Screen 1

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