Stylus pen

Abstract

A touch system includes a touch panel, a stylus pen and a touch sensing controller. The touch panel includes a plurality of driving electrodes and a plurality of sensing electrodes. The stylus pen provides the touch panel with a pen frequency signal set for detecting a position of a stylus pen and a pressure of the stylus pen. The touch sensing controller outputs a plurality of driving signals having different frequency components to the touch panel and determines at least one of touch coordinates of a finger and touch coordinates of the stylus pen based on a plurality of sensing signals received from the touch panel.

What is claimed is: 
     
         1 . A stylus pen comprising:
 a conductive tip contactable with a touch panel;   a pressure sensor measuring a pressure of the conductive tip applied to the touch panel and outputting a pen pressure signal;   a frequency signal generator generating a pressure sensing signal based on the pen pressure signal and generating a position sensing signal for sensing a position of the stylus pen; and   a mixer mixing the position sensing signal and the pressure sensing signal to provide a mixing signal to the conductive tip.   
     
     
         2 . The stylus pen of  claim 1 , wherein the pressure sensing signal has a uniform frequency and varied amplitude in accordance with the pen pressure signal. 
     
     
         3 . The stylus pen of  claim 1 , wherein frequencies of each of the pressure sensing signal and the position sensing signal are different from a frequency of a driving signal applied to a driving electrode of the touch panel.