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US 2013/0155014 A1Published application
Capacitive cordless writing device
AssigneeEgalax_Empia Technology Inc.
InventorSHANG-TAI YEH
Life of this patent
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Abstract
When a touch sensor is approached or touched by a capacitive pen in a small area, the corresponding approach or touch signal might be slightly less than the threshold originally used for normal detection. By comparing the sum of the corresponding approach or touch signal and some adjacent signals with the threshold, the approach or touch of a small-area object that otherwise would not be detected by the original method can be determined. The capacitive pen can be made of bonded conductive fibers.
Claims10
A cordless capacitive writing device, comprising:
- a touch sensor including a plurality of conductive strips including a plurality of first conductive strips and a plurality of second conductive strips;
- a capacitive pen including a conductive pen head for receiving a driving signal from the touch sensor and a signal conversion circuit for generating a delayed driving signal based on the driving signal after delaying a predefined period of time, the delayed driving signal being transmitted to the touch sensor through the conductive pen head, wherein the driving signal and the delayed driving signal have the same frequency and phase;
- and
- a controller for detecting the location of at least one external conductive object based on a change in capacitive coupling of the driving signal between the touch sensor and the at least one external conductive object in a passive mode, and detecting the location of at least one external conductive object based on the delayed driving signal received from the capacitive pen in an active mode.
1 more element
Dependencies are inferred from the claim text.