Stylus nib design and accuracy improvement

Abstract

A stylus comprising a housing and a nib portion configured to be attached to the housing and to extend out from the housing, wherein the nib portion comprises at a tip area an integrated conductive tip electrode and at least one integrated conductive ring electrode surrounding the tip electrode at least partially and electrically isolated from the tip electrode.

1 . (canceled) 
     
     
         2 . A touch-sensitive display device comprising:
 a touch sensor;   a display screen; and   control logic configured to receive spatial capacitance measurements of a conductive tip electrode and a conductive ring electrode of an active stylus, wherein the control logic is configured to calculate a tilt parameter of the active stylus relative to the display screen using the received spatial capacitance measurement of the conductive tip electrode and the received spatial capacitance measurement of the conductive ring electrode of the active stylus.   
     
     
         3 . The touch-sensitive display device of  claim 2 , wherein the control logic is configured to use the calculated tilt parameter to at least one of create a tilt-dependent writing effect or detect a smearing effect. 
     
     
         4 . The touch-sensitive display device of  claim 2 , wherein the control logic is configured to calculate the tilt parameter of the active stylus including:
 identifying that a first spatial capacitance measurement of the received spatial capacitance measurements corresponds to the conductive tip electrode; and   identifying that a second spatial capacitance measurement of the received spatial capacitance measurements corresponds to the conductive ring electrode.   
     
     
         5 . The touch-sensitive display device of  claim 2 , wherein the control logic is configured to calculate the tilt parameter of the active stylus including identifying a distance between a first spatial capacitance measurement from the conductive tip electrode and a second spatial capacitance measurement from the conductive ring electrode. 
     
     
         6 . The touch-sensitive display device of  claim 2 , wherein the calculated tilt parameter comprises an angle of at least one of an orientation or an attitude of the active stylus relative to the display screen. 
     
     
         7 . The touch-sensitive display device of  claim 2 , wherein the calculated tilt parameter comprises an angle at which the active stylus intersects at least one of a plane perpendicular to the display screen or a plane parallel to the display screen. 
     
     
         8 . The touch-sensitive display device of  claim 2 , wherein the calculated tilt parameter comprises an angle the active stylus is pointing relative to a coordinate system defined on a surface of the display screen. 
     
     
         9 . The touch-sensitive display device of  claim 2 , wherein the control logic is further configured to:
 determine an electrode configuration of the conductive tip electrode and the conductive ring electrode of the active stylus; and   determine an orientation of the active stylus relative to the display screen using the calculated tilt parameter and the determined electrode configuration.   
     
     
         10 . The touch-sensitive display device of  claim 2 , wherein the control logic is further configured to determine an electrode configuration of the conductive tip electrode and the conductive ring electrode of the active stylus including identifying a nib identity associated with the active stylus. 
     
     
         11 . A method comprising:
 obtaining spatial capacitance measurements of a conductive tip electrode and a conductive ring electrode of an active stylus;   determining a tilt parameter of the active stylus relative to a display screen of a touch-sensitive display device using the spatial capacitance measurement of the conductive tip electrode and the spatial capacitance measurement of the conductive ring electrode; and   determining an orientation of the active stylus relative to the display screen using the determined tilt parameter.   
     
     
         12 . The method of  claim 11 , further comprising at least one of creating a tilt-dependent writing effect or detecting a smearing effect using the determined tilt parameter. 
     
     
         13 . The method of  claim 11 , wherein determining the tilt parameter of the active stylus comprises:
 identifying that a first spatial capacitance measurement of the spatial capacitance measurements corresponds to the conductive tip electrode; and   identifying that a second spatial capacitance measurement of the spatial capacitance measurements corresponds to the conductive ring electrode.   
     
     
         14 . The method of  claim 11 , wherein determining the tilt parameter of the active stylus comprises identifying a distance between a first spatial capacitance measurement from the conductive tip electrode and a second spatial capacitance measurement from the conductive ring electrode. 
     
     
         15 . The method of  claim 11 , wherein determining the tilt parameter comprises determining an angle of at least one of an orientation or an attitude of the active stylus relative to the display screen. 
     
     
         16 . The method of  claim 11 , wherein determining the tilt parameter comprises calculating an angle at which the active stylus intersects at least one of a plane perpendicular to the display screen or a plane parallel to the display screen. 
     
     
         17 . The method of  claim 11 , wherein determining the tilt parameter comprises calculating at least one of an angle or a direction the active stylus is pointing relative to a coordinate system defined on a surface of the display screen. 
     
     
         18 . The method of  claim 11 , further comprising determining an electrode configuration of the conductive tip electrode and the conductive ring electrode of the active stylus, wherein determining the orientation of the active stylus relative to the display screen comprises determining the orientation using the determined electrode configuration. 
     
     
         19 . The method of  claim 11 , further comprising determining an electrode configuration of the conductive tip electrode and the conductive ring electrode of the active stylus including identifying a nib identity associated with the active stylus. 
     
     
         20 . A method comprising:
 determining an electrode configuration of a conductive tip electrode and a conductive ring electrode of an active stylus;   determining a tilt parameter of the active stylus relative to a display screen of a touch-sensitive display device; and   determining an orientation of the active stylus relative to the display screen using the determined electrode configuration and the determined tilt parameter.   
     
     
         21 . The method of  claim 20 , wherein determining the tilt parameter comprises determining the tilt parameter using spatial capacitance measurement of the conductive tip electrode and the spatial capacitance measurement of the conductive ring electrode.