Mobile Terminal Lifting Detection Logic for False Positives
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Solution Overview
Problem
Existing mobile terminal technologies suffer from false detection of lifting, leading to increased power consumption due to incorrect sensor readings, particularly when the device is positioned upright.
Innovation Solution
An information processing device with an angle determination section and a lifting determination section that only conducts lifting checks when the device is angled beyond a certain threshold and meets specific acceleration conditions, preventing false positives by differentiating between upright positioning and actual lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lifting determination is continuously carried out using acceleration sensor, then lifting detection capability is improved, but false detection occurs when device is positioned upright
Solution Approach 1:
The patent applies dynamics by making the lifting determination process conditional rather than continuous. The system dynamically adjusts the detection logic based on device posture: when the device is in portrait orientation (upright position), lifting determination is suspended unless specific acceleration conditions are met. This dynamic approach resolves the contradiction by enabling accurate lifting detection when needed while preventing false positives during normal upright positioning.
Solution Approach 2:
The patent changes the parameter of determination conditions based on device state. By introducing posture-dependent logic, the system modifies which parameters trigger lifting determination. In portrait mode, the system requires additional acceleration thresholds to be met before triggering lifting detection, whereas in landscape mode, standard acceleration thresholds apply. This parameter change strategy effectively reduces false detection while maintaining detection capability.
2Measurement precision
If additional sensors like proximity sensors are added to prevent false detection, then measurement precision is improved, but device weight and complexity increase
Solution Approach 1:
The patent applies multi-functionality by enabling the acceleration sensor to perform both motion detection and posture identification functions. Instead of adding a separate proximity sensor, the system processes acceleration data to determine device orientation (portrait vs. landscape) and uses this information to modulate lifting detection behavior. This universal approach eliminates the need for additional sensors, maintaining measurement precision while avoiding increased weight and complexity.
3Speed
If lifting determination is continuously performed, then detection response is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by making lifting determination intermittent rather than continuous. The system periodically evaluates device posture and only performs lifting determination when appropriate conditions are met (i.e., when device is in landscape mode or when specific acceleration patterns are detected in portrait mode). This periodic execution maintains detection responsiveness for actual lifting events while significantly reducing power consumption by avoiding unnecessary continuous processing during normal upright device usage.
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 approach reduces false detection of lifting when the device is upright, conserving power and allowing for a more compact design by relying solely on acceleration sensors, eliminating the need for additional sensors like proximity sensors.
Implementation Method 1
an acceleration sensor, and a lifting determination section configured to determine whether or not the mobile terminal has been lifted
Data Source
AI summary
An embodiment of the present invention prevents false detection of lifting. An embodiment of the present invention includes: an angle determination section (62) configured to determine whether or not an angle of a longitudinal direction of a mobile terminal (1) with respect to a vertical direction is less than or equal to a predetermined value; and a lifting determination section (65) configured to determine whether or not the mobile terminal (1) has been lifted, the lifting determination section carrying out determination in (i) a case where the angle of the longitudinal direction of the electronic device with respect to the vertical direction is greater than the predetermined angle and (ii) a case where (a) the angle of the longitudinal direction of the electronic device with respect to the vertical direction is less than or equal to the predetermined angle and (b) an acceleration of the electronic device in the longitudinal direction satisfies a predetermined condition.