NFC Tag Detection for Mobile Device Pocket Dialing Prevention
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Solution Overview
Problem
Mobile devices often experience unintended activation when placed in pockets, leading to 'pocket dialing' due to accidental button presses, resulting in unwanted calls or transmissions.
Innovation Solution
Integration of a Near Field Communication (NFC) circuit in mobile devices that detects an NFC-enabled tag, allowing the device to enter a locked mode when placed in a pocket or designated area, thereby preventing accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the device is placed in a pocket without any detection mechanism, then the device is easily accessible and portable, but unintended activation occurs leading to pocket dialing
Solution Approach 1:
An NFC tag is placed in the pocket to serve as an intermediary detection mechanism. When the device enters the pocket, the NFC circuit detects the tag and triggers the device to enter locked mode, preventing accidental activation while maintaining easy portability
Solution Approach 2:
The mechanical holster system with magnets and sensors is replaced with an NFC-based detection system. The NFC tag and circuit provide a more reliable and flexible detection mechanism that eliminates the need for physical holster insertion while preventing pocket dialing
2Reliability
If a magnetic holster system is used to detect pocket placement, then the device can be locked when placed, but the system complexity increases and coverage is limited
Solution Approach 1:
The NFC tag is extracted from the device and placed independently in the pocket or on surfaces. This separates the detection function from the device, simplifying the device structure while maintaining reliable locked mode activation when the tag is detected
Solution Approach 2:
The NFC tag serves multiple functions: it can be placed in pockets, on nightstands, or any surface to trigger locked mode. This universal applicability replaces the need for specific magnetic holsters, reducing system complexity while expanding usage scenarios
3Speed
If the NFC circuit continuously polls for tags, then the device can quickly detect pocket placement, but battery consumption increases
Solution Approach 1:
The NFC circuit performs periodic polling at intervals rather than continuous scanning. This periodic action maintains adequate detection speed for pocket placement while significantly reducing battery consumption compared to continuous polling
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
The NFC system effectively prevents 'pocket dialing' by ensuring the device remains in a locked, idle state when an NFC tag is detected, providing greater flexibility and coverage, and conserving battery life through periodic polling.
Implementation Method 1
Near Field Communication technology is commonly used for contactless short-range communications based on radio frequency identification (RFID) standards, using magnetic field induction to enable communication between electronic devices
Data Source
AI summary
A communications device includes a housing and radio frequency (RF) circuitry and a processor carried by the housing and operative with each other. A Near Field Communications (NFC) circuit is carried by the housing and connected to the processor. This circuit is configured to detect an NFC enabled tag using an NFC communications protocol when the device is positioned near the tag. The circuit generates a disable signal to the processor upon detecting the NFC enabled tag. The processor is configured to cause the device to enter a locked, operating mode upon receiving the disable signal and to enter or remain in an unlocked, operating mode if the NFC circuit does not generate a disable signal indicative that the NFC circuit has not detected the NFC enabled tag.