Head Mounted Display Image Position Adjustment for Visual Stability
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Solution Overview
Problem
Head-mounted display devices struggle to maintain a stable visual alignment of virtual images with respect to the outside scene, especially during user movement, leading to positional deviations and discomfort such as image sickness.
Innovation Solution
A head-mounted display device equipped with a detecting unit to track head movement and an image-position setting unit that adjusts the position of the image light based on predicted head movement and visual line direction, ensuring the virtual image remains synchronized with the outside scene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image light is fixed relative to the outside scene, then the user can visually recognize them as one integrated image, but the image light deviates from the user's visual field during head movement
Solution Approach 1:
The patent implements dynamic image position adjustment by detecting head movement and correspondingly adjusting the image light position. The image-position setting unit changes the position of image light in the light guide plate based on detected head movement, transforming the system from a static fixed-position approach to a dynamic adaptive approach that maintains visual alignment during user movement.
2Ease of operation
If the image light position is adjusted to follow head movement, then the visual alignment is maintained, but the system complexity increases due to additional detection and control mechanisms
Solution Approach 1:
The patent introduces a detection unit as an intermediary component that bridges the user's head movement and the image light position adjustment. This intermediary detects head movement and provides feedback to the image-position setting unit, enabling automatic compensation without requiring complex direct mechanical coupling between the user's head and the optical system.
3Reliability
If the image light is integrated with the outside scene, then a unified visual image is achieved, but the moving user cannot maintain consistent image recognition
Solution Approach 1:
The patent implements a feedback mechanism where the detection unit continuously monitors head movement and provides real-time information to the image-position setting unit. This closed-loop feedback system allows the image light position to be dynamically adjusted based on actual head movement, maintaining both visual integration and position accuracy during user movement.
Data Source
AI summary
A head mounted display device includes an image display unit including an image-light generating unit configured to generate image light on the basis of image data and emit the image light, the image display unit causing, in a state in which the image display unit is worn on the head of a user, the user to visually recognize the image light as a virtual image and transmitting an outside scene, a detecting unit configured to detect the movement of the head of the user, and an image-position setting unit configured to change, on the basis of a cyclical change in the position of the head of the user predicted on the basis of the detected movement of the head, the position of the image light in a region where the image-light generating unit is capable of generating the image light.