HMD Display Positioning via Dual-Axis Actuation
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) lack adjustability to accommodate users with different head sizes, shapes, pupil-to-forehead distances, and eye reliefs, often requiring complex manipulations or part replacements for proper fitting.
Innovation Solution
The system includes a first and second electromechanical actuator to move a display apparatus along vertical and horizontal tracks, respectively, allowing for precise positioning of the HMD relative to the user's eyes, with an eye-tracking subsystem to adjust focal length based on eye movement, and a user input mechanism for intuitive control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional HMDs are designed with fixed structure, then manufacturing is simple, but they cannot accommodate users with different head sizes, shapes, pupil-to-forehead distances, and eye reliefs
Solution Approach 1:
The patent applies dynamics by making the HMD structure adjustable rather than fixed. Multiple adjustment mechanisms allow the device to change its configuration dynamically to fit different users: the display apparatus can move along vertical and horizontal tracks, the headband can be adjusted in length and tension, and various components can be repositioned. This dynamic adaptability resolves the contradiction by enabling the fixed-structure simplicity to transform into a flexible, user-specific configuration without requiring complex manipulations or part replacements.
Solution Approach 2:
The patent segments the HMD into multiple independently adjustable components: the display apparatus is separable from the headband, the headband consists of adjustable sections, and positioning mechanisms are divided into distinct vertical and horizontal adjustment systems. This segmentation allows each component to be adjusted independently to accommodate different anatomical features, resolving the contradiction between adaptability and complexity by breaking down the adjustment task into manageable, modular segments rather than requiring complex integrated adjustments.
2Measurement precision
If conventional HMDs require complex manipulations or part replacements for proper fitting, then positioning accuracy can be achieved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service through intuitive adjustment mechanisms that allow users to perform positioning themselves without requiring complex manipulations or tool use. The display apparatus can be easily repositioned along tracks, the headband adjusts to fit different head sizes, and the system accommodates various anatomical features through user-friendly controls. This self-service capability resolves the contradiction by enabling users to achieve precise positioning independently, eliminating the need for complex operations while maintaining positioning accuracy.
3Adaptability or versatility
If HMDs are made adjustable for different users, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent applies universality by designing adjustment mechanisms that serve multiple functions simultaneously. The same vertical track system accommodates both display positioning and eye relief adjustments, while the horizontal track system handles both lateral positioning and pupil-to-forehead distance adjustments. The headband provides both size adjustment and tension control in a single component. This multi-functionality resolves the contradiction by enabling comprehensive adaptability through integrated mechanisms rather than requiring separate adjustment systems for each parameter, thereby reducing overall device complexity.
Data Source
AI summary
The disclosed systems for positioning head-mounted displays may include a first track along which a display apparatus of a head-mounted display is configured to move in a first direction and a second track along which the display apparatus is configured to move in a second, different direction. A first electromechanical actuator may move the display apparatus along the first track, and a second electromechanical actuator may move the display apparatus along the second track. Various other methods and systems are also disclosed.