Touch screen performance comparison
The resistive touch screen works in an environment completely isolated from the outside world. It is not afraid of dust, moisture and oil. It can be touched by any object and is suitable for industrial control. The disadvantage is that because the outer layer of the composite film is made of film, too much force or sharp touch may scratch the touch screen which will be unable to work anymore.
The capacitive touch screen has a high resolution and a good light transmittance, which can well meet various requirements. This type of touch screen is 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 sufficiently large capacitance is coupled between the ITO working surface of the interlayer, the current flowing away causes a malfunction of the capacitive touch screen; There is no response when touched with gloves or a hand-held insulating object because of the increased insulation medium.
The infrared touch screen determines the touch position by measuring the on and off of the infrared light, regardless of the material of the transparent baffle selected for the touch screen (some have no baffles at all). Therefore, the use of a baffle with good light transmission properties, and anti-reflective treatment, can get a good visual effect. However, due to the limitation of the volume of the infrared emission tube, it is impossible to emit high-density infrared rays, so the resolution of such a touch screen is not high. In addition, since the infrared touch screen relies on infrared sensing to work, external light changes, such as sunlight or indoor lights, can affect its accuracy.
The surface acoustic wave technology is very stable, and the controller of the surface acoustic wave touch screen calculates the touch position by measuring the position of the decay moment on the time axis, so the accuracy is very high. The surface acoustic wave touch screen also has a third axis (z axis), that is, a pressure axis – the amount of power that the user touches the screen can be obtained by calculating the amount of attenuation at the attenuation of the received signal, which can be divided into up to 256 levels of force. The greater the power, the wider and deeper the attenuation gap on the received signal waveform. Of all the touch screens, only the surface acoustic wave touch screen has the ability to sense touch pressure.
According to the analysis of the structure, principle and performance characteristics of the touch screen, the applicable occasions of different touch screens are as follows:
4 wire touch screen: not afraid of dust, oil and photoelectric interference, fear of scratch is its main defect. Applicable to public places with fixed users, such as industrial control sites, offices, homes, etc.
5-wire resistive touch screen: excellent sensitivity and transparency, long service life, not afraid of dust, oil and photoelectric interference, suitable for all kinds of public places, especially suitable for sophisticated industrial control sites.
Eagle touch as one of the resistive touchscreen manufacturers in China, we provide both resistive touchscreen and Pcap touchscreen.