HMD Mounting State Detection for Power Saving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted display apparatuses fail to distinguish between the mounted state on a user's head and the carried state accurately, leading to unnecessary power consumption when the device is not being used for image display.
Innovation Solution
Incorporating a mounting state determination unit and an image sound output control unit that utilize sensors such as pressure sensors, nose pad sensors, and gyro sensors to differentiate between a first state where the device is mounted for image recognition and a second state where it is mounted on the head, adjusting the display and sound output accordingly to conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wearable optical device determines mounting state only based on mounted vs. not mounted, then the determination method is simple, but the accuracy of state differentiation is poor
Solution Approach 1:
The patent segments the mounting state determination into two distinct states: first state (mounted on head in usable position) and second state (mounted or carried in unusable position). By dividing the determination into specific sub-states rather than a single binary state, the system achieves more precise state differentiation while maintaining relatively simple determination logic based on sensor data analysis.
2Use of energy by moving object
If the image display unit remains ON when the device is carried in unusable state, then the device is ready for immediate use, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of the image display unit based on real-time mounting state detection. The system continuously monitors sensor data to determine whether the device is in first state (mounted on head) or second state (carried), and dynamically adjusts the display unit's power state accordingly. This dynamic adaptation allows the system to reduce power consumption when carried while maintaining quick transition capability to operational state when mounted.
3Use of energy by moving object
If the device turns OFF image display when mounted on head, then power is saved, but the user cannot see the image when needed
Solution Approach 1:
The patent employs feedback mechanisms through sensors (acceleration sensor, gyro sensor, contact sensor) that continuously monitor the mounting state and provide real-time information to the control unit. Based on this feedback, the system automatically adjusts the image display unit's operation. When sensors detect the device is properly mounted on the head (first state), the display is activated; when carried or removed (second state), the display is deactivated. This feedback loop ensures power savings are achieved without compromising user access to images when actually needed.
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
Effectively reduces power consumption by turning off image display when the device is not being used for image recognition, while maintaining sound output in certain states, thereby optimizing battery life.
Implementation Method 1
a nose pad sensor configured to detect application of user pressure to a nose pad of the head-mounted display apparatus
Implementation Method 2
a gyro sensor configured to detect a change in an orientation of the head-mounted display apparatus
Implementation Method 3
an acceleration sensor configured to detect a vibration when the head-mounted display apparatus is picked up
Data Source
AI summary
A head-mounted display apparatus includes an image display unit configured to display an image, a sound output unit configured to output a sound, a mounting state determination unit configured to determine a mounting state of the head-mounted display apparatus, and an image sound output control unit configured to turn ON/OFF display, and turn ON/OFF an output of a sound, based on the mounting state. The image sound output control unit is configured to turn ON display of an image and an output of a sound when the mounting state is the first state, turn OFF display of an image and turn ON an output of a sound when the mounting state is not the first state and is the second state, and turn OFF display of an image and an output of a sound when the mounting state is not the first state and is not the second state.