Hangzhou Xuhong Technology Co.,Ltd
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Capacitive Touch Screen is a technology that uses changes in human body capacitance to detect touch positions. The working principle of a capacitive screen is that when the user's fingers come into contact with the screen, a capacitor is formed due to the conductivity of the human body. The controller of the screen can detect the change in capacitance and determine the touch position based on this change. The following are the basic structural components of a capacitive screen:
1. Glass Substrate:
Capacitive screens are usually composed of multiple layers of glass or plastic materials, with the bottom layer being a sturdy glass substrate used to protect the internal structure.
2. Conductive Layer:
On the inside of the glass substrate, there is a transparent conductive layer, usually made of indium tin oxide (ITO) material, used to detect changes in capacitance.
3. Sensor Electrodes:
There are multiple transverse and longitudinal sensing electrodes distributed on the conductive layer, which form a capacitive sensing grid.
4. Insulator:
To prevent short circuits caused by direct contact of the conductive layer, there will be an isolation layer between the electrodes.
5. Protective Layer:
The surface of the capacitive screen will have a protective layer, usually a thin plastic or glass layer, to protect the sensing electrode from external damage.
6. Controller:
The controller is the brain of the capacitive screen, responsible for detecting and processing signals of capacitance changes, and converting these signals into touch position coordinates on the screen.
7. Flexible Printed Circuit (FPC):
FPC connects the sensing electrode and controller, responsible for transmitting electrical signals.
8. Optical Clear Adhesive (OCA):
OCA may be used between multi-layer structures to achieve better adhesion and optical performance.
9. Environmental Light Sensor (ALS) and Proximity Sensor:
Some capacitive screens also integrate ambient light sensors and proximity sensors to automatically adjust screen brightness and turn off touch screens to prevent misoperation.
The structural design of the capacitive screen gives it high sensitivity and accuracy, while also supporting multi touch operations. Multi touch technology allows users to perform more complex operations such as zooming, rotating, etc. by simultaneously touching the screen with multiple fingers. With the popularity of smartphones and tablets, capacitive screen technology has been widely applied.
