Pen input device, method for correcting input coordinate thereof and electronic device for supporting the same

A method for correcting an input coordinate of an electronic device having a pen input device, the method comprising:

• detecting the input coordinate of the pen input device when the pen input device is touched to a touch screen device of the electronic device causing an electrostatic capacitance to be changed;
• obtaining a recognition coordinate by electromagnetic induction when the pen input device approaches the touch screen device;
• generating inclination information of the pen input device as a function of a write pressure of the pen input device, the recognition coordinate, and the input coordinate;
• and
• performing coordinate correction based on the inclination information of the pen input device.

A pen input device that supports an electromagnetic induction function and an electrostatic pen function, the pen input device comprising:

• a housing formed in a rod shape with an opened end, and having a band-shaped dielectric coating portion formed on a grip portion to be grasped by a user's hand to define an accommodation space;
• a resonance circuit unit accommodated within the housing and configured to provide a resonance frequency;
• a tip configured to be movable by a predetermined range in a longitudinal direction of the housing, the tip including a contact portion that is installed to protrude outwardly from the opened end of the housing such that a pressure applied to the tip causes a change in the resonance frequency, the contact portion being made of a dielectric material or configured by being bonded to be enclosed by a dielectric material;
• and
• a channel configured to interconnect the contact portion of the tip and the band-shaped dielectric coating portion of the grip portion, wherein the channel is electrically isolated from a coil of the resonance circuit unit.

A method of correcting an input coordinate of a pen input device, the method comprising:

• detecting the input coordinate of the pen input device when the pen input device is touched to a touch screen device of an electronic device causing an electrostatic capacitance to be changed;
• obtaining a recognition coordinate by electromagnetic induction when the pen input device approaches the touch screen device;
• generating inclination information of the pen input device as a function of a write pressure based on a change in resonance frequency, the obtained recognition coordinate and the detected input coordinate;
• and
• performing coordinate correction based on the inclination information of the pen input device.