Head-Mounted Display Pupil Alignment via Pivot and Telescopic Adjustment
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Solution Overview
Problem
Display devices with head-mounted holders face challenges in adjusting the position of the coupling-out section horizontally or relative to the front section, leading to incomplete coverage of the user's eyebox due to anatomical differences in interpupillary distance and temple-to-pupil distance among users.
Innovation Solution
The adjustment method involves selecting and positioning a first spectacle lens with a coupling-out section that aligns with the user's pupil by varying the distance and angle between spectacle lenses, using a pivot joint to adjust the angle between the lenses, and countersinking the spectacle lens for optimal alignment, allowing for customization based on individual anatomical measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the position of the coupling-out section is changed in the horizontal direction, then the alignment with the user's pupil can be improved, but the optical guidance and coupling-out are significantly impaired
Solution Approach 1:
The device is divided into modular components: the front section with spectacle lenses, the imaging unit, and the holder with temples. This segmentation allows the front section to be adjusted independently to align with different users' pupils while maintaining the integrity of the optical system. The coupling-out section remains fixed relative to the spectacle lens, preserving optical reliability.
Solution Approach 2:
The holder incorporates adjustable elements including pivot joints at the connection between temples and front section, and adjustable nose pads. These dynamic features enable the front section to be positioned at different angles and distances to accommodate varying interpupillary distances and temple-to-pupil distances, achieving proper alignment without compromising optical performance.
2Adaptability or versatility
If the eyebox size is increased to cover the pupil completely, then the user can perceive the virtual image reliably, but anatomical differences between users make this difficult to achieve
Solution Approach 1:
The holder is designed as a universal adjustment mechanism that can accommodate a wide range of anatomical variations. The combination of pivot joints, adjustable nose pads, and flexible temple connections provides multi-functional adjustment capabilities that adapt the device to different interpupillary distances and temple-to-pupil distances without requiring complex customized mechanisms for each user.
Solution Approach 2:
The adjustment mechanism uses simple dynamic elements: pivot joints that allow angular adjustment, sliding nose pads for distance adjustment, and flexible temple connections. These dynamic features enable users to easily adjust the device to their own anatomical dimensions, achieving complete pupil coverage without overly complex mechanisms.
3Adaptability or versatility
If the distance between spectacle lenses is altered to adjust interpupillary alignment, then the fit for different users can be improved, but the structural stability may be affected
Solution Approach 1:
The central part incorporates a telescopic mechanism that allows the distance between spectacle lenses to be adjusted while maintaining structural stability. This dynamic feature enables the frame to accommodate different interpupillary distances without compromising the integrity of the optical system or the stability of the spectacle lenses in the front section.
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
This method ensures complete coverage of the user's pupil with the exit pupil, enabling reliable perception of the virtual image by adapting to the specific anatomical dimensions of each user, enhancing the usability of the display device across different users.
Implementation Method 1
an imaging optical system secured to the holder which, when the holder is fitted on the head of the user, images the generated image into an exit pupil such that the user can perceive it as a virtual image with his first eye, wherein the first spectacle lens is part of the imaging optical system
Implementation Method 2
the generated image is guided in the first spectacle lens and is coupled out of the first spectacle lens via a coupling-out section
Data Source
AI summary
A method for adjusting a display device with a holder that can be fitted on the head of a user includes a front section in which two spectacle lenses are arranged which are connected to each other via a central part, an imaging unit secured to the holder, which generates an image, and an imaging optical system secured to the holder which, when the holder is fitted on the head of the user, images the generated image into an exit pupil such that the user can perceive it as a virtual image with his first eye. The first spectacle lens with the coupling-out section is positioned in such a way that the exit pupil of the imaging optical system coincides at least partially with the pupil of the first eye of the user when the holder is fitted on the head of the user.