Method and apparatus for preventing malfunctions of a touch panel disposed near an antenna
An apparatus for preventing malfunctions of a touchpad disposed near an antenna is provided. An NFC coil is disposed underneath a touchpad. In NFC, an NFC card approaches the surface of the touchpad. A touch controller sets the detection sensitivity of a finger to a reference value when an NFC module does not emit alternating magnetic fluxes. The touch controller reduces the detection sensitivity at the timing when the NFC coil starts the emission of the alternating magnetic fluxes. The touch controller returns the detection sensitivity to the reference value at the timing when the NFC coil stops the emission of the alternating magnetic fluxes. The NFC module directly transmits a signal with which the touch controller changes the detection sensitivity to the touch controller through a hardware line.
1. An electronic device comprising:
a touch panel;
a coil
emits alternating magnetic fluxes of a first time interval during a pre-polling mode to detect an approaching of a near field communication (NFC) card, and
emits alternating magnetic fluxes of a second time interval during a full-polling mode after a metal has been detected;
a wireless module emits alternating magnetic fluxes of a third time interval after said NFC card has been detected; and
a touch controller detects an operation to said touch panel with a predetermined detection sensitivity, and reduces said detection sensitivity when said coil is emitting said alternating magnetic fluxes.
2. The electronic device of claim 1 , wherein said wireless module conforms to said NFC standard.
3. The electronic device of claim 1 , wherein said touch controller receives a transmission signal showing that said coil is emitting said alternating magnetic fluxes through a hardware transmission path from said wireless module.
4. The electronic device of claim 1 , wherein said touch controller reduces said detection sensitivity when said wireless module is emitting said alternating magnetic fluxes.
5. The electronic device of claim 4 , wherein said touch controller disables an input from said touch panel while said wireless module is emitting said alternating magnetic fluxes.
6. The electronic device of claim 1 , wherein said touch panel is a touchpad operating a mouse cursor.
7. The electronic device of claim 6 , wherein said coil is disposed on a back surface of said touchpad in order to be adjacent to said touchpad.
8. The electronic device of claim 7 , wherein a projection of an outline of said touchpad is overlapped with an outline of said coil.
9. The electronic device of claim 7 , wherein said coil is formed with a pattern on a circuit board of said touchpad disposed on said back surface of said touchpad.
10. The electronic device of claim 1 , wherein said coil is incorporated in a touch screen containing a display.
11. The electronic device of claim 1 , wherein said second time interval is longer than said first time interval.
12. The electronic device of claim 11 , wherein said third time interval is longer than said second time interval.
13. A method comprising:
detecting by a touchpad of an electronic device having a wireless module a physical quantity that changes due to the approach of a finger with a predetermined detection sensitivity;
in response to an emission of an alternating magnetic flux by said wireless module, reducing said detection sensitivity;
in response to said emission of said alternating magnetic flux has stopped, returning said detection sensitivity to said predetermined detection sensitivity;
emitting a first alternating magnetic flux for detecting a partner device approaching said touchpad;
reducing said detection sensitivity in response to said emission of said first alternating magnetic flux;
emitting a second alternating magnetic flux for communicating with said partner device; and
stopping a detection function of said touchpad while said second alternating magnetic flux is being emitted.