Let's try it. Use this pen to cover the tip and operate the mobile phone.

at present, mobile phones on the market are basically capacitive multi-touch screens, that is, screens that can't use a stylus (except Samsung's S Pen, which will be discussed below) and support multi-touch. How much do you know about the screen of your mobile phone? Let's talk about it briefly today.

as early as 1999, Motorola launched the world's first Chinese handwritten touch-screen mobile phone A6188, which subverted the traditional numeric keyboard input method and left the text input to the touch screen and stylus, which only attracted the attention of many consumers. This is the beginning of resistive touch screen.

This kind of touch screen is controlled by pressure sensing, and it is mainly composed of a resistive multilayer composite film screen matching with the display surface. When a finger or stylus clicks on the touch screen, the two conductive layers produce a contact point at the touch point to change the resistance, and the signal is sent to the touch screen controller. The controller detects this contact point and calculates the accurate position, which translates into different operation effects. The disadvantage of this kind of screen is that because the front of the screen is not protected by hard material, it is easy to damage the screen in daily use, and there will be obvious depression after a period of use. For cheap resistance screens, nails are needed to complete the touch operation well.

resistive touch screen can only judge one touch point at a time. If there are more than two touch points, it cannot make a correct judgment.

At this time, capacitive multi-touch screen began to be applied on iPhone, which completely subverted the use experience of touch screen and showed people brand-new mobile phone operating habits such as stylus-free and multi-touch.

Single-contact capacitive touch screen is mainly composed of a transparent thin film layer on the glass screen, a protective glass layer on the conductor layer, and long electrodes on the four sides of the touch screen, which form a low-voltage AC electric field in the conductor. When the user touches the screen, the finger and the working surface form a coupling capacitor. Because the working surface is connected with high-frequency signals, the finger absorbs a small current, which flows out from the electrodes at the four corners of the touch screen. The controller obtains the position of the touch point through precise calculation of the ratio of these four currents.

For many years after the advent of the single-contact capacitive touch screen, the touch screen can only respond to one contact at a time. Once we control more than one contact, this touch screen will confuse the cursor because it cannot be positioned.

the p>iphone uses a typical capacitive multi-touch screen. Multi-touch capacitive touch screen is a touch screen detection method derived from capacitive touch, which supports multi-touch.

the touch screen of p>iPhone adopts Multi-Touch All-Point detection method. It can be divided into two aspects: one is to collect multi-point signals at the same time, and the other is to judge the meaning of each signal, which is called gesture recognition. Compared with the touch technology that can only be input by a single point, the multi-touch technology allows users to touch the display screen in multiple places at the same time, so that they can expand and rotate the web page or picture.

the p>S Pen stylus is the first handwriting technology introduced by Samsung on the Galaxy Note mobile phone.