Performance comparison of industrial touch monitors
Capacitive Touch Screen
Capacitive touch monitor, with their high resolution and good light transmittance, can well meet all kinds of requirements. They are common in public places. However, the capacitive touch screen uses the human body as an electrode of a capacitor. When a conductor is close to and a large enough capacitor is coupled with the sandwich ITO working surface, the flowing current will cause the misoperation of the capacitive touch screen. In addition, wearing gloves or hand-held insulated objects will not respond to touch, because of the increased insulation of the medium.
Resistive Touch Screen
The resistive touch monitor works in an environment completely isolated from the outside world. It is not afraid of dust, water vapor and oil, and can be touched by any object. It is more suitable for use in the field of industrial control. The disadvantage is that because the outer layer of the composite film is made of plastic, it may scratch the touch screen if you touch it too hard or use a sharp object.
Infrared Touch Screen
The infrared touch monitor determines the touch position by measuring the infrared on-off, which has nothing to do with the transparent baffle material used on the touch screen. Therefore, the selection of good light transmission performance of the baffle, and anti-reflective treatment, can get a good visual effect. However, due to the limitation of the size of the infrared transmitter tube, it is impossible to emit high density infrared radiation, so the resolution of the touch screen is not high. In addition, since the infrared touch screen relies on infrared induction to work, changes in external light, such as sunlight or indoor lights, will affect its accuracy.
Surface Acoustic Touch Screen
The surface acoustic technology is very stable, and the controller of the surface acoustic touch screen calculates the touch position by measuring the position of the time axis at the time of attenuation, so it is very accurate. The surface acoustic touch screen also has a third axis (z axis), that is, the pressure axis. By calculating the attenuation of the received signal, the force of the user touching the screen can be obtained, which can be divided into 25 and 6 levels of force at most. The greater the force, the wider and deeper the attenuation gap on the received signal waveform. Among all touch screens, only the surface acoustic touch screen has the performance of sensing touch pressure.
How to choose industrial touch screen correctly?
Identify your needs
General international first-line brand touch screen, relatively approachable price of some products of narrow range of application, generally can only be used for their own brand products, or even part of their own brand series of products, can not adapt to the market of other brands of equipment, so try to choose strong adaptability of equipment.
There are many touchscreen brands in the domestic market, including high, medium and low levels, among which there are international first-line brands with excellent quality and domestic brands with affordable prices. If the budget is sufficient, consider big brands first. If the budget is limited, the required touch screen is only used as a display, not often do control input. So you can choose some relatively cheap domestic brands.
Look at performance and certification
Check whether there is a certification at home and abroad, it is recommended to try it or find a special person or equipment to test the performance.
Comparative reflective property
It mainly refers to the shadow behind the overlapping image caused by mirror reflection, such as figures, Windows, lights and so on. Reflection is the negative effect of the touch screen, the smaller the better, it affects the user’s browsing speed, the touch screen is the absolute coordinate system, to choose which point directly, and the mouse this kind of relative positioning system is the essential difference is a place of intuitedness.
Look at the absolute coordinates
The touch screen is physically an independent coordinate positioning system. The data of each touch is converted to the coordinates on the screen through calibration data. In this way, the output data of the same point is required to be stable no matter what the set of coordinates is on the touch screen. Then the touch screen can not guarantee the absolute coordinate positioning, inaccurate point, this is the most afraid of the touch screen problem, touch detection and positioning, all kinds of touch screen technology rely on their own sensors to work, and even some touch screen itself is a set of sensors. The positioning principle and the sensor used determine the response speed, reliability, stability and life of the touch screen.
Transparency, which directly affects the visual effect of the touch screen, commonly said transparency can only be the average transparency in the figure, of course, the higher the better.