Your Professional LCD Module Manufacturer

What is the working principle of capacitive touch screen

You may be unfamiliar with the capacitive touch screen, but the capacitive touch screen is closely related to our lives. It is mainly used on mobile phones and other electronic devices. Let's take a look at the working principle of capacitive touch screen together.

Best capacitive touch screen from China manufacturer
When we touch the screen with a finger on the surface, a certain amount of electric charge will be transferred to the human body. In order to recover these electric charges, we can charge from the four corners of the screen. The amount of charge in each direction When it is proportional to the distance of the contact point, so that we can infer which direction the contact point is in.
There will also be an ITO coating under the surface capacitor coating, usually a metal electrode that needs to be linearized around the screen to reduce the corner and side effects on the magnetic field. Sometimes there is also an ITO shield under the ITO coating to shield noise. The surface capacitive touch screen should be calibrated at least once before use. The sensitive capacitive touch screen can penetrate a thicker protective layer than the surface capacitive touch screen without correction. Inductive capacitive etching different ITO modules on two layers of ITO coating. It is necessary to consider factors such as the total impedance of each module, the impedance of the connecting line between each module, and the parasitic capacitance generated by the intersection of the two layers of ITO modules. In addition, in order to detect finger contact, the area of ​​the ITO module should be smaller than that of a finger. When a diamond pattern is used, the diagonal length is usually limited to between 4 and 6 mm.
The capacitive touch screen technology uses the current sensing of the human body to work. The projected capacitive panel touch technology projection capacitive touch screen is to etch two mutually perpendicular ITO conductive circuit modules on two layers of ITO conductive glass coatings, which are regarded as It is a slider that continuously changes in the X and Y directions. When the current flows through one wire in the drive line, if there is a signal of capacitance change from the outside, it will cause the change of the capacitance node on the other layer of wire. The change of the detected capacitance value can be measured by the electronic circuit connected to it, and then converted into a digital signal by the A/D controller for the computer to perform arithmetic processing to obtain the (X, Y) axis position, and then achieve the purpose of positioning.
Through the above, I believe that everyone knows the working principle of the capacitive touch screen, and I hope it will be helpful to you. If you are interested in the capacitive touch screen, you can have an in-depth understanding.

Featured Articles

The Next Generation of Displays: Capacitive Touch Panels

Explore the innovative world of capacitive touch panels and how they are revolutionizing the consumer electronics industry. Learn about the benefits, features, and applications of these cutting-edge d

All You Need to Know About Graphic LCD Modules

Explore the world of graphic LCD modules in the consumer electronics industry, specifically in the realm of LCD display modules. Learn about the features, benefits, and applications of graphic LCD mod

Revamp Your Display Experience with Capacitive Touch Panels

Enhance your viewing experience with the latest technology in display panels - capacitive touch screens. Learn how these advanced panels can revolutionize the way you interact with your devices and ta

Discover the Wonders of TFT Capacitive Touch in LCD Modules

Explore the world of TFT capacitive touch technology and its applications in LCD modules. Learn about the functionalities and benefits of this advanced touch technology, without the hassle of commitme

Stay Ahead of the Competition with a 2.4 Inch TFT LCD Screen

Discover how a high-quality 2.4 inch TFT LCD screen can give you the edge over your competitors in the consumer electronics industry. Find out why this display module is a must-have for your next proj

Exploring the Advanced Features of 128x64 Graphic LCD Display in Consumer Electronics

Discover the cutting-edge technology behind the 128x64 graphic LCD display in the consumer electronics industry. Learn about the latest research and technical knowledge related to liquid crystal modul