Smartphone ‘s screens

• Smartphones are one of the most common examples of capacitive touch screen panels. For example, Apple's iPhone series and numerous Android phones. It works by taking advantage of the conductivity of the human body. When a finger touches the screen, the finger forms a coupling capacitance with the capacitive sensing layer on the surface of the screen.
• Inside the screen there is a transparent conductive layer, usually indium tin oxide (ITO), with many tiny capacitive cells distributed. These capacitive cells can cause the capacitance value to change due to the touch of a finger.
• Touch detection circuits are able to sense this change in capacitance and convert it into an electrical signal. After being processed by the chip inside the mobile phone, the location and strength of the touch are determined, so as to realize various operations, such as tapping the icon to open the app, swiping the screen to turn the page, etc.
• The screen of the tablet

Tablets like Apple iPad, Huawei MatePad, etc., also widely adopt capacitive touch screens. Its touch experience is similar to that of a smartphone.

• Due to the large size of the tablet screen, when designing the capacitive touch screen, a finer layout is required to ensure uniform touch sensitivity throughout the screen area. For example, the use of a multi-layer capacitive sensing structure enables more accurate detection of the position of touches.
• The capacitive touch screen makes it easy to use the tablet for drawing, writing, and other operations. For example, using a capacitive stylus, the capacitive sensing between the tip of the pen and the screen accurately converts the action of writing or drawing into a digital signal and records it.

The screen of a smartwatch

• The screens of smart watches such as Apple Watch and Samsung Galaxy Watch are also capacitive touch screens
• Considering the smaller screen of the smart watch, the design of the capacitive touch screen pays more attention to accuracy and low power consumption. Because the battery capacity of the watch is limited, it is necessary to minimize the consumption of power on the premise of ensuring the normal touch function.
• The way it works is also based on capacitance variation. When a finger touches the screen, the sensors inside the watch respond quickly, enabling actions such as checking the time, switching watch faces, opening apps, and more.

Capacitive touch screens shine on multiple devices such as smartphones, tablets, and smart watches with excellent touch performance, greatly optimizing the human-computer interaction experience. With the continuous progress of science and technology, capacitive touch screens are bound to continue to upgrade and innovate, with more refined resolution, faster response speed, and lower power consumption, bringing more convenience to people to operate electronic devices, integrating into intelligent life in an all-round way, and deeply changing the way people obtain information, entertainment and leisure.