A, capacitance pen is used for what
When the capacitor pen first appeared, it was widely used in some mobile phones with touch screen function. It could be operated with the capacitor pen to operate the corresponding function button at the top of the screen, so as to achieve the user's purpose. Since the technology was not advanced at that time, many functions of mobile phones and tablets were not developed, which greatly limited the use of capacitive pens. However, nowadays, both hardware and software technologies have been promoted by leaps and bounds, and capacitive pens are more widely used. Nowadays, with the more perfect function development of more apps, the function of capacitive pen also has a qualitative change, which is no longer just used for touch operation.
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Nowadays, capacitive pens can be directly used in mobile devices, such as mobile phones, notebooks and tablets, to carry out work by using the functions of APPS, such as drawing, drawing, correcting or marking documents, etc., as well as taking quick notes of relevant meetings or conversations.
Two, what is the principle of capacitor pen
To know the working principle of the capacitor pen, we must first understand the principle of the capacitor screen used with the capacitor pen:
Capacitive screen, full name is capacitive touch screen, it is the use of human body's current induction work, for a four-layer composite glass screen, glass screen inner surface and interlayer each coated with a layer of ITO (namely coating conductive glass), the outermost layer is a thin layer of silica glass protection layer. ITO coating is used as the working surface, four electrodes are drawn from four corners, and ITO is the shielding layer in the inner layer to ensure a good working environment. Capacitive touch screen uses the human body's current induction to work. When the finger touches the metal layer, a coupling capacitance is formed between the human electric field, the user and the surface of the touch screen. For high-frequency current, capacitance is a direct conductor, so the finger absorbs a small current from the contact point. The current flows from the electrodes in the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance between the finger and the four corners. The controller calculates the position information of the touch point by accurately calculating the ratio of the four currents.
The principle of the capacitive pen is to simulate human fingers through the conductor. When the pen tip touches the capacitive screen, the current is also generated, and the controller calculates the touch information of the current and completes the operation.