What is the difference between capacitive touch screen and resistive touch screen based on the principle of capacitive touch screen

Capacitive touch screen and resistive touch screen are two common touch screen technologies, which have significant differences in principles, structures, and applications. The following will provide a detailed introduction to the principle, structure, and characteristics of capacitive touch screens, and compare and analyze them with resistive touch screens.

1、 The principle of capacitive touch screen
Capacitive touch screen is a technology that utilizes the capacitance changes of human body charges or other conductive materials to achieve touch positioning. The basic principle is to use the electric field formed by the transparent conductive layer on the touch panel. When the human body or other conductive body comes into contact with the touch panel, the distribution of the electric field will be changed, which will be sensed and used to calculate the touch coordinates.

Specifically, capacitive touch screens are composed of glass, transparent conductive layers, coating insulation layers, etc. The transparent conductive layer can be made of materials such as silver nanowire mesh, ITO film, or grid structure. Electrode sensors are installed at the four corners or edges of the touch panel, which convert changes in the electric field into electrical signals through scanning, and then process them to ultimately determine the coordinate position of the touch.

2、 Structure of capacitive touch screen
Capacitive touch screens typically use glass as the substrate for touch panels, coated with a transparent conductive layer and covered with a scratch resistant coating. The transparent conductive layer is generally uniformly distributed throughout the entire touch panel and can be made by methods such as fine micro wire mesh or uniform coating. On top of the conductive layer, there is also a coating insulation layer to protect the transparent conductive layer.

3、 Characteristics of capacitive touch screen

High sensitivity: Capacitive touch screens are based on the principle of capacitance changes and have higher sensitivity to touch. You don’t need to press hard when touching, just touch lightly to operate.
Fast response speed: The response speed of capacitive touch screens is very fast, and the feedback of touch operations is almost real-time.
Support for multi touch: Capacitive touch screens can detect multiple touch points simultaneously, enabling multi touch functionality. This allows users to perform various gesture operations such as zooming, rotating, sliding, etc. with their fingers.
High transparency: Capacitive touch screens have excellent transparency and almost no impact on display performance.
Wear resistance: The capacitive touch screen adopts wear-resistant coating, which has good wear resistance and long service life.
4、 The difference between capacitive touch screen and resistive touch screen

Working principle: Capacitive touch screens are based on the principle of capacitance variation, while resistive touch screens are based on the principle of resistance variation.
Touch mode: The capacitive touch screen adopts a pressure free touch mode, which can be operated with just a light touch. A resistive touch screen requires a certain amount of pressure to bring the two resistive layers into contact in order to perform positioning.
Touch perception: Capacitive touch screens can sense conductor contact without the need for actual physical contact. Resistive touch screens require physical contact and can only sense objects with conductivity.
Sensitivity: Capacitive touch screens have higher sensitivity and only require gentle touch when touched. Resistive touch screens require a certain amount of pressure, so their sensitivity is relatively low.
Multi touch: The capacitive touch screen supports multi touch and can achieve multiple gesture operations. Resistive touch screens can only achieve single point touch.
Transparency: Capacitive touch screens have good transparency and almost do not affect the display effect. Resistive touch screens can affect display performance and require the addition of a transparent layer for protection.
Summary:
Capacitive touch screen and resistive touch screen are two common touch screen technologies, which have significant differences in principles, structures, and characteristics. Capacitive touch screens use capacitance changes to achieve touch positioning, with high sensitivity, fast response speed, and support for multi touch, making them widely used in modern intelligent devices.