HMD Vibration Motor Startup Pulsing for Stable Rotation
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Solution Overview
Problem
Existing head-mounted displays face challenges in stabilizing motor rotation for vibration, due to individual differences in vibration motors and the effect of gravitational force on orientation.
Innovation Solution
A drive control system that includes a vibration section with a motor and a motor control section, which outputs a first drive signal for a predetermined startup period to drive the vibration section with a first drive force, and then outputs a second drive signal with a smaller second drive force, including a plurality of single pulses intermittently output, to stabilize motor rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PWM control is performed to adjust vibration error due to individual differences, then vibration consistency is improved, but drive force supplied to the vibration motor is reduced
Solution Approach 1:
The patent applies periodic action by using intermittent pulse signals instead of continuous PWM control. The control section outputs pulse signals at specific intervals during the vibration period, allowing the vibration motor to receive sufficient drive force while still achieving consistent vibration output through periodic stimulation.
Solution Approach 2:
The patent implements preliminary action by outputting a first drive signal with higher amplitude before the main vibration occurs, and then outputting a second drive signal after the vibration starts. This preliminary high-amplitude signal ensures the vibration motor receives adequate drive force to overcome gravitational effects and individual differences, while subsequent lower-amplitude signals maintain consistent vibration.
2Reliability
If continuous drive signal is supplied to overcome gravitational force effects, then vibration stability is improved, but energy consumption increases
Solution Approach 1:
The control section outputs pulse signals periodically during the vibration period rather than continuously. This periodic pulsing maintains vibration stability by stimulating the motor at key moments while significantly reducing overall energy consumption compared to continuous drive signals.
Solution Approach 2:
The patent uses partial action by applying drive signals only at specific phases of the vibration period rather than continuously. The first drive signal provides excessive force initially to overcome gravitational effects, then the second drive signal provides partial continuation to maintain stability, optimizing energy 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
The proposed solution effectively stabilizes motor rotation for vibration in head-mounted displays, ensuring consistent and desired vibration sensations regardless of individual motor differences and orientation effects.
Implementation Method 1
a vibration section including at least a motor
Implementation Method 2
pulse width modulation (PWM) control is performed in order to adjust an error in vibration
Data Source
AI summary
Rotation of a DC motor (423) for vibration used for a head-mounted display (12) is stabilized.A drive control system (100) includes a vibration section (42) including at least the DC motor (423) and provided in the HMD 12 including a display panel (38) disposed before eyes of a user when the user wears the HMD 12, and a motor control section (60) outputting a drive signal for controlling drive force that drives the vibration section (42), and the motor control section (60) outputs, in a predetermined startup period (T1), a first drive signal (DP1) causing the vibration section (42) to be driven by first drive force, and, after the startup period (T1) elapses, outputs a second drive signal (DP2) driving the vibration section (42) using second drive force smaller than the first drive force and including a plurality of single pulses to be intermittently output.