If you've ever used the Galaxy Note 2, you know that the S Pen has a button to interact with the phone, and you can take a screenshot by pressing the button. So there is no doubt that the S Pen needs to be powered, so you should agree? Of course, the quick thing that comes to mind is that the S Pen has a rechargeable power source inside. Well, that's the problem, we want to further explore how charging the S Pen actually works.
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The answer: The S Pen is powered by wireless inductive charging via the screen. There is a circuit board at the bottom of the screen, and when the S Pen is used (that is, when the Pen is near the screen), the lower circuit board generates a magnetic field on the top of the screen to charge the S Pen.