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Stylus pen and touch panel configured to detect input position and input pressure

  • US 10,488,951 B2
  • Filed: 10/29/2015
  • Issued: 11/26/2019
  • Est. Priority Date: 01/27/2015
  • Status: Active Grant
First Claim
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1. A stylus pen for indicating a position on a touch panel, the stylus pen comprising:

  • a conductive tip configured to receive an electric field transmission signal from at least one electrode of the touch panel;

    a circuit portion configured to generate an electric field receiving signal corresponding to the received electric field transmission signal;

    a variable capacitor, disposed between the conductive tip and the circuit portion, configured to vary the electric field receiving signal depending on a pressure applied to the conductive tip;

    a conductive body, disposed outside the variable capacitor, for electrically connecting the conductive tip and the circuit portion;

    an elastic member configured to restore a position of the conductive tip;

    an insulator on an outer circumferential surface of the conductive tip, to electrically isolate the conductive tip from the elastic member and the variable capacitor; and

    a conductive support member comprising a first receiving hole in a first end of the conductive support member and a second receiving hole in a second end, opposite the first end, of the conductive support member,wherein the variable capacitor comprises;

    a dielectric comprising a first surface and a second surface positioned opposite to the first surface;

    a first electrode in contact with the first surface of the dielectric; and

    a conductive variable electrode configured such that a contact area between the conductive variable electrode and the second surface of the dielectric is varied depending on the pressure applied through the conductive tip, andwherein the conductive body extends beyond the dielectric in a direction towards the circuit portion of the stylus penwherein the first receiving hole is coupled with the conductive variable electrode, andwherein the insulator is on an outer circumferential surface of the conductive support member to isolate the conductive support member from the elastic member.

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