Stepper Motor Display Adjustment for HMD Vergence-Accommodation Conflict
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Solution Overview
Problem
Conventional head-mounted display (HMD) devices fail to compensate for vergence and accommodation conflicts, leading to visual fatigue and nausea in users due to their inability to adjust the focal plane effectively.
Innovation Solution
Incorporating one or more stepper motors to dynamically adjust the focal plane of the display by moving the lenses or displays along a specific axis, allowing for precise control and alignment with the user's gaze direction, thereby alleviating vergence and accommodation conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional HMDs use fixed displays, then device complexity is reduced, but vergence and accommodation conflicts occur causing visual fatigue
Solution Approach 1:
The patent implements dynamic adjustment of the display focal plane using voice coil motors that can rapidly reposition the display along the optical axis in response to user eye tracking data, transforming the fixed display system into a dynamically adjustable one that adapts to changing vergence and accommodation requirements
Solution Approach 2:
The system incorporates eye tracking sensors that continuously monitor user gaze and provide feedback to the control system, which then adjusts the display position via voice coil motors to maintain proper vergence-accommodation alignment, creating a closed-loop feedback system that eliminates visual fatigue
2Speed
If voice coil motors are used to move displays rapidly, then response speed is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical adjustment mechanisms with voice coil motors that use electromagnetic fields to achieve rapid, precise, and quiet display repositioning, eliminating the need for complex mechanical gears, belts, or linkages while achieving superior response speed and positioning accuracy
3Manufacturing precision
If stepper motors are used to adjust focal plane, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent employs stepper motors with integrated position feedback mechanisms that provide precise control of the display focal plane through electrical signals, replacing less accurate mechanical positioning methods while maintaining relatively simple system architecture through direct digital control
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 solution enhances user experience by reducing visual fatigue and nausea, providing a more immersive and comfortable virtual or augmented reality environment by ensuring that the displayed images are focused at the correct plane, aligning with the user's eye position.
Implementation Method 1
one or more stepper motors to move one or more displays of the head-mounted display device
Data Source
AI summary
A head-mounted display device includes a first set of one or more lenses and a first display configured to provide visual data through the first set of one or more lenses. The head-mounted display device further includes a first stepper motor mechanically coupled to the first display, and the first stepper motor is configured to move the first display along a first axis by rotating a rotatable component of the first stepper motor. The head-mounted display device further includes a first electronic controller configured to (i) determine a first position of the first display, (ii) receive information identifying a second position of the first display, and (iii) generate one or more electrical signals that cause the first stepper motor to move the first display from the first position to the second position along the first axis.