Touch Panel Sensitivity Control Near NFC Coil
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Solution Overview
Problem
Touch panels near NFC coils experience malfunctions due to noise interference from magnetic fluxes, which is mitigated by weakening magnetic fluxes but reduces NFC performance.
Innovation Solution
An electronic device with a touch panel, an electromagnetic coupling wireless module, and a touch controller that reduces detection sensitivity of the touch panel when the NFC coil emits magnetic fluxes, thereby minimizing noise interference while maintaining NFC functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If measures are taken to weaken the magnetic fluxes passing through the touchpad, then the noise level is reduced, but the magnetic fluxes emitted to space are also weakened which causes problems to the NFC
Solution Approach 1:
The touch controller dynamically adjusts the detection sensitivity of the touch panel based on the operational state of the NFC coil. When the NFC coil is emitting magnetic fluxes, the detection sensitivity is reduced to prevent noise-induced malfunctions. This dynamic adjustment resolves the contradiction by adapting the touch panel's noise resistance in real-time without permanently compromising NFC performance
Solution Approach 2:
The invention changes the detection sensitivity parameter of the touch panel controller based on the magnetic flux emission state of the NFC coil. By adjusting this parameter dynamically, the system achieves both reduced noise interference during NFC operation and maintained touch functionality when NFC is not active, resolving the trade-off between noise reduction and NFC reliability
2Ease of manufacture
If the NFC coil is positioned directly under the touchpad, then the influence on chassis and interference with other devices is reduced, but the touchpad experiences problems due to noise from magnetic fluxes
Solution Approach 1:
The touch controller acts as an intermediary that mediates between the NFC coil's magnetic flux emission and the touch panel's detection function. By introducing this control layer that can dynamically adjust sensitivity, the system maintains the space-efficient positioning while compensating for the noise interference through active sensitivity management
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents touch panel malfunctions by reducing detection sensitivity during NFC coil operation, enhancing noise resistance without compromising NFC performance.
Implementation Method 1
electromagnetic coupling wireless module, a coil connected to the electromagnetic coupling wireless module... The electromagnetic coupling wireless module conforms to the near field communication (NFC) standard... when the coil is emitting magnetic fluxes
Implementation Method 2
the touch controller detects coordinates of the touch panel with a predetermined detection sensitivity
Data Source
AI summary
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.