Principle and classification

The touch screen system generally includes a touch detection device and touch screen controller two parts. A touch detection device is installed in front of the display to detect the user's touch position and then sent to the touch screen controller; the main function of the touch screen controller is to receive touch information from the touchpoint detection device, convert it into contact coordinates, and then send it to the CPU, which can receive the commands sent by the CPU and execute them at the same time.

With the progress of technology, touch screen technology has also undergone a gradual upgrading and development process from low-end to high-end. According to its working principle, it is generally divided into four categories: resistive touch screen, Capacitive Touch Screen, infrared touch screen, and surface acoustic wave touch screen.

Application occasions

According to the analysis of the structure, principles, and performance characteristics of the touch screen, the application of different touch screen occasions is as follows.

Four-wire resistive touch screen: not afraid of dust, oil, photoelectric interference. The main defect is afraid of scratching. Suitable for public places with fixed users, such as industrial control places, offices, homes, etc.

Five-wire Resistive Touch Screen: excellent sensitivity and light transmission rate, long service life, not afraid of dust, oil, and photoelectric interference, suitable for a variety of public places, especially precision industrial control places.

Capacitive Touch Screen

Capacitive induction touch screen: poor stability and easy to drift due to changes in capacitance with temperature, humidity, or grounding conditions. Afraid of electromagnetic field interference and drift, not easy to use in industrial control places and places with interference. Can be used for public information inquiry with low accuracy requirements; it needs frequent calibration and positioning.

Infrared induction touch screen: low resolution, but not subject to current, voltage, and static interference, suitable for some harsh environmental conditions; suitable for a variety of public places, offices without infrared and strong light interference, as well as industrial control with low requirements for site accuracy.

Surface acoustic wave touch screen: pure glass material, good light transmission, long service life, good scratch resistance, suitable for a variety of unknown users of public places. However, it is afraid of accumulating dust and oil for a long time, so it is best to use in a clean environment. Otherwise, a regular cleaning service is required.

Development trend

Touch screen technology facilitates the operation and use of computers and is a promising interactive input technology. Countries around the world are generally concerned about this and invest a lot of manpower and resources in research and development, new touch screens continue to emerge.

Touch pen: touch screen operated by a stylus is similar to a whiteboard. The stylus has a display interface, windows, and icons, in addition to signature and marker functions. This type of stylus is much more powerful than the earlier light pens that only provided menu selections.

Touchpad: The touchpad uses pressure-sensitive capacitive touch technology and has the largest screen area. It consists of three parts: The bottom layer is a central sensor that monitors whether the touchpad is being touched and then processes the information. The middle layer provides interactive graphics, text, etc. The outermost layer is a high-strength touch surface layer, made of plastic material. When a finger touches the outer surface, that information can be sent to the sensor and logged in within a thousandth of a second. In addition to being PC compatible, it also features high brightness, clear images, and easy interaction. Therefore, it is used in pointing information inquiry systems (such as electronic bulletin boards) and has received good results.

In short, the development of touch screens shows the trend of specialization, multimedia, three-dimensional, large screen, etc. With the development of the information society, people need access to a variety of public information. Touch-screen technology for the interactive window of the public information transmission system, the use of advanced computer technology to text, images, music, commentary, animation, video, and other forms, intuitive, vivid to introduce people to a variety of information, making it come to life. This is a great convenience. It is foreseeable that with the rapid development of touch screen technology, the application area of the touch screens will become more and more extensive, and the performance will be better and better.

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