HMD Positioning Adjustment via Asymmetric Luminance Patterns
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Solution Overview
Problem
Conventional Head Mounted Displays (HMDs) face difficulties in accurately adjusting the wearing position when left and right images are shifted in the depth direction, making it hard for users to perceive changes in line test patterns and thus correctly position the HMD.
Innovation Solution
An image display apparatus with first and second display devices for the left and right eyes, respectively, and a control unit that displays patterns with the same shape at corresponding positions, allowing users to easily adjust the HMD position by displaying test patterns like double circles at symmetrical positions, which become blurry if the HMD is not correctly aligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If line test patterns are displayed to enable adjustment of the wearing position of the HMD, then the adjustment process can be performed, but it is hard to perceive a change in the test patterns arising from a change in the depth direction, making it difficult to accurately adjust the wearing position
Solution Approach 1:
The patent applies color changes by displaying test patterns with different luminance levels (bright and dark regions) that create high contrast. When the HMD is correctly positioned, the bright and dark patterns align perfectly to form clear composite images. When there is a depth direction shift, the misalignment between bright and dark patterns becomes visually apparent, enabling users to detect and correct the positioning error accurately.
Solution Approach 2:
The patent uses asymmetric bright and dark test patterns that are intentionally designed to be complementary rather than identical. The bright pattern and dark pattern have different luminance characteristics and are positioned to create asymmetric visual feedback. This asymmetry ensures that any depth direction misalignment produces a clearly distinguishable visual effect, making it easy for users to perceive and correct positioning errors.
2Ease of operation
If conventional line test patterns are used for HMD positioning adjustment, then the adjustment can be performed, but the left and right images may be shifted in the depth direction without the user perceiving the change
Solution Approach 1:
The patent implements feedback by displaying composite images formed by combining bright and dark test patterns from left and right eyes. When the HMD is correctly positioned, the feedback shows perfectly aligned patterns creating clear, stable images. When there is a depth direction shift, the feedback immediately shows misalignment between the bright and dark patterns, providing real-time visual information that guides the user to make corrective adjustments.
Solution Approach 2:
The patent uses luminance contrast (bright and dark patterns) as a visual feedback mechanism. The alternating bright and dark regions create high-contrast patterns that are highly sensitive to positional changes. This luminance-based visual feedback allows users to immediately perceive depth direction shifts and make accurate positioning adjustments.
Data Source
AI summary
An image display apparatus is worn by a user in such a manner that a first image and a second image are displayed on display units corresponding to both of the user's eyes, wherein, at corresponding positions in the first and the second images, the display units display test patterns including the same graphics that enable the user to adjust the wearing position of the image display apparatus.