Acoustic Lid State Detection for Backlight Control
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Solution Overview
Problem
Current lid state detection methods in clamshell devices are not advanced enough to ensure optimal power management and energy conservation, as they rely on motion sensors which may not be reliable for precise control of backlighting, leading to inefficiencies and potential component wear.
Innovation Solution
A sound pattern matching algorithm using a microphone to capture and compare real-time acoustic data with pre-loaded sound patterns to determine the lid's state, integrating motion detection to initiate sound matching only during lid opening or closing actions, allowing for precise control of the backlight module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion sensors (Hall Effect sensors) are used for lid state detection, then the device can transition between power modes, but the detection precision and reliability are insufficient for optimal backlight control
Solution Approach 1:
The patent replaces mechanical motion sensors (Hall Effect sensors) with an acoustic detection system using a microphone to detect lid state. The microphone captures sound waves generated during lid opening/closing actions, and signal processing algorithms analyze these acoustic signals to determine lid state, providing more precise and reliable detection for backlight control
Solution Approach 2:
The patent changes the detection parameter from magnetic field changes (Hall Effect) to acoustic sound wave characteristics. By analyzing sound frequency, amplitude, and temporal patterns during lid movement, the system achieves improved detection precision and reliability for backlight control decisions
2Measurement precision
If sound pattern matching is continuously performed, then lid state detection accuracy improves, but energy consumption increases
Solution Approach 1:
The patent implements periodic sound pattern matching only during specific events (lid opening/closing actions) rather than continuous monitoring. The system activates the microphone and performs sound pattern matching selectively when motion is detected or when acoustic events are likely to occur, reducing energy consumption while maintaining high detection accuracy when needed
Solution Approach 2:
The system uses the device's existing microphone (designed for audio recording) to also perform lid state detection, eliminating the need for dedicated detection hardware. This self-service approach allows accurate detection using already-powered components, reducing additional energy consumption
3Use of energy by moving object
If motion detection triggers sound matching, then energy efficiency improves, but detection reliability may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where motion detection results trigger sound pattern matching, and the sound matching results are used to confirm or correct the initial motion-based state determination. This multi-stage feedback loop ensures reliable detection while maintaining energy efficiency by only performing intensive sound analysis when motion suggests a state change is occurring
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 method enhances energy efficiency and extends the longevity of device components by providing accurate lid state detection, optimizing power consumption and improving overall system sustainability.
Implementation Method 1
The motion detecting unit is configured to detect motion of a lid section of the electronic device to generate motion data
Implementation Method 2
a sound sample that is captured by a sound capture unit
Implementation Method 3
The sound matching unit is configured to match a soundprint derived from a sound sample to one or more sound patterns stored within in a sound pattern database
Data Source
AI summary
A backlight control device for use in an electronic device includes a motion detecting unit, a sound matching unit and a controller. The motion detecting unit is configured to detect motion of a lid section of the electronic device to generate motion data. The sound matching unit is configured to match a soundprint derived from a sound sample that is captured by a sound capture unit, to one or more sound patterns stored within in a sound pattern database to generate a lid state indication signal if the motion data indicates the motion of the lid section corresponds to a predetermined state. The controller is configured to control a backlight module of a display device of the electronic device according to the lid state indication signal.