Pen and touch input system

A stylus pen configured to interact with a touch input device comprising a sensor unit and a control unit configured to control the sensor unit,

• wherein the sensor unit comprises:
• a plurality of first patterns each extending in a first direction and having first ends electrically connected to the control unit;
• and
• a plurality of third patterns each extending in a second direction different from the first direction and having first ends electrically connected to the control unit,
• wherein the control unit applies a touch driving signal to the plurality of first patterns and receives a touch sensing signal from the plurality of third patterns, and
• the control unit receives a stylus pen sensing signal from at least one pattern of the plurality of first and third patterns,
• wherein the stylus pen comprises:
• a body unit having at least a portion extending in one direction;
• an inductor unit comprising a ferrite core disposed in the body unit and a coil wound in multiple layers around at least a portion of the ferrite core;
• a capacitor unit disposed in the body unit and comprising a capacitor electrically connected to the coil of the inductor unit;
• and
• a core having at least a portion disposed in the body unit to move in the one direction by pressure applied to one end thereof, and
• a capacitance of the capacitor unit and/or an inductance of the inductor unit are varied by the pressure applied to the one end of the core.