The mainstream status of Capacitive Touch Screen monitors.

Currently, most touch screens are capacitive. capacitive touch displays offer a number of advantages, which make them widely used in a wide range of devices.

How it works？

Capacitive touch screen overlays work using the body's current sensing. When a finger touches the screen, the finger and the surface of the touch screen form a coupling capacitance due to the presence of an electric field in the human body. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a part of the current from the contact point, this current flows out of the four corner electrodes of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners, and the controller can get the position of the touch point by accurately calculating the proportion of these four currents.

Advantages：

• High sensitivity:The capacitive touch screen enables very precise touch positioning and responds to slight touch movements. On smartphones, for example, users can easily perform actions such as clicking on small icons and making precise text selections.
• Multi-touch support:This is an important feature of capacitive touch screens. It allows users to use multiple fingers to operate at the same time, such as two-finger zooming in and out of the map and three-finger switching applications on the phone, which greatly enriches the way users interact with the device.
• Durability is better:The surface of the capacitive touch screen is generally made of glass, which has good wear resistance and scratch resistance. At the same time, its internal structure is relatively stable, and it can maintain a long service life under normal use.

Other touchscreen types

While capacitive touchscreens dominate the mainstream, there are other types of touchscreens that exist as well.

The working principle of resistive touch screens is based on pressure sensitivity. It is mainly composed of two conductive layers, when an object presses the screen, the two conductive layers are in contact at the pressing point, so that the current can pass through, and the position of the touch point is determined by detecting the position of the current. However, the accuracy of resistive touch screen is relatively low, and it does not support multi-touch, and is mainly used in some devices that do not require high touch accuracy and have relatively simple functions.

2.Infrared touch screen

The infrared touch screen is to install an infrared emitter and a receiver tube around the screen to form an infrared matrix. When an object is occluding the infrared rays, the touch position is determined by detecting the occluded infrared position. The advantage of this touch screen is that it can be made into a larger size, but it is easy to be disturbed by external light, and the touch accuracy is also limited, and it is generally used for some large public query equipment.