HMD Vibration Control via Motion Sensor Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Head-mounted displays (HMDs) cause discomfort due to vibrations and distorted sounds from haptic feedback, leading to an unpleasant user experience.
Innovation Solution
A head-mounted display system with a vibration driver, motion sensor, and sound controller that adjusts vibration signals based on motion state and head circumference to generate vibrations, reducing discomfort by mitigating high-frequency and continuous vibrations, and using a cushion pad to absorb sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If haptic feedback vibrations are generated to provide users with good experience, then user engagement and immersion are improved, but discomfort and distorted sounds are generated due to the vibrations
Solution Approach 1:
The system uses motion sensors to detect the actual vibration state of the HMD and feeds this information back to the sound controller. The sound controller then adjusts the vibration signal in real-time based on the detected motion state, creating a closed-loop control system that prevents excessive vibrations and associated discomfort while maintaining immersive haptic feedback.
Solution Approach 2:
The vibration signal is dynamically adjusted based on the detected motion state of the HMD. The system transitions from static vibration generation to dynamic adaptation, where vibration parameters (frequency, amplitude) are continuously modified according to real-time motion detection, allowing the system to provide engaging haptic feedback while avoiding discomfort thresholds.
2Object-affected harmful factors
If vibration signals are adjusted based on motion state to reduce discomfort, then vibration-induced discomfort is reduced, but system complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The motion sensor serves multiple functions: it detects the motion state for vibration adjustment, tracks user head movements for display orientation, and provides data for both comfort optimization and immersive experience enhancement. This multi-functionality reduces the need for separate dedicated sensors, thereby limiting the increase in system complexity.
Solution Approach 2:
The system combines the vibration control function with the existing motion tracking capabilities of the HMD. By merging the vibration adjustment algorithm with the existing motion sensing and processing pipeline, the system avoids adding separate independent control systems, thus minimizing the increase in overall system complexity while achieving vibration discomfort reduction.
3Object-affected harmful factors
If high-frequency vibrations are reduced to minimize discomfort, then vibration-induced discomfort is reduced, but haptic feedback quality deteriorates
Solution Approach 1:
The system applies different vibration attenuation strategies to different frequency ranges based on their respective roles. High-frequency vibrations that cause discomfort are selectively reduced, while mid-range frequencies that provide essential haptic feedback quality are preserved. This localized frequency-specific adjustment maintains haptic feedback quality while minimizing discomfort.
Solution Approach 2:
The system dynamically changes vibration parameters (frequency, amplitude, duration) based on the detected motion state and comfort thresholds. Rather than uniformly reducing all high-frequency vibrations, the system selectively adjusts parameters to maintain feedback quality within acceptable comfort ranges, preserving essential haptic information while reducing discomfort-causing components.
4Object-affected harmful factors
If cushion pad is added to absorb sound and reduce distorted sounds, then sound distortion is reduced, but device weight and complexity increase
Solution Approach 1:
The cushion pad acts as an intermediary acoustic element positioned between the speaker and the user's ear. It selectively absorbs and dampens distorted high-frequency sounds while allowing clear audio frequencies to pass through, thereby reducing sound distortion without requiring complete sound isolation or additional active noise cancellation systems that would add more weight.
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 system provides users with a more comfortable experience by offering both audio-visual and haptic feedback while minimizing vibration-induced discomfort and sound distortion.
Implementation Method 1
The motion sensor is configured to sense a motion state of the main body. The motion sensor is an accelerometer configured to measure an acceleration value of the main body.
Implementation Method 2
The vibration driver receives a vibration signal from the sound controller, adjusts the vibration signal as needed according to the motion state and then drives the vibrator to generate vibration by the vibration signal.
Implementation Method 3
The speaker outputs a sound according to a sound signal received from the sound controller.
Implementation Method 4
using a cushion pad to absorb sound
Data Source
AI summary
A head mounted display including a main body, a sound controller, a vibration driver, a motion sensor, a vibrator and a speaker is provided. The main body has a display device. The sound controller is electrically connected to the main body. The vibration driver is electrically connected to the sound controller. The motion sensor is configured to sense a motion state of the main body. The vibrator is electrically connected to the vibration driver. The vibration driver receives a vibration signal from the sound controller, adjusts the vibration signal as needed according to the motion state and then drives the vibrator to generate vibration by the vibration signal. The speaker is electrically connected to the sound controller. The speaker outputs a sound according to a sound signal received from the sound controller. A driving method of a head mounted display is also provided.