Head-Mounted Display Rotation Restricting Unit for Light Guide Plate Protection
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Solution Overview
Problem
Head-mounted displays face issues with deformation and damage of light guide plates due to external forces, leading to variations in convergence angles, and existing solutions either compromise on visibility or fail to adequately prevent damage.
Innovation Solution
A head-mounted display design featuring a frame with a rotation restricting unit, where the optical member and its extended part are arranged across a predetermined gap, restricting relative rotation and preventing deformation or damage by limiting the movement range of the light guide plates and connection plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peripheries of the light guide plates are supported by a highly-rigid member, then the deformation and damage of light guide plates is prevented, but the member appears in the visual field and visibility is reduced
Solution Approach 1:
The patent uses a thin film structure (rotation restricting unit) instead of a bulky highly-rigid member to prevent deformation of light guide plates. This thin film approach provides the necessary structural support while being sufficiently transparent to avoid obstructing the visual field, thus resolving the contradiction between reliability and visibility.
2Illumination intensity
If the light guide plates are connected using a connection plate, then the visibility is improved, but the light guide plates may still be deformed or damaged depending on strength of the connection plate
Solution Approach 1:
The patent divides the support function into multiple components: the connection plate for joining optical modules and the rotation restricting unit for preventing deformation. This segmentation allows each component to specialize in its function - the connection plate maintains visibility while the rotation restricting unit ensures reliability by preventing light guide plate deformation.
3Ease of operation
If the frame is stuck when removing the head-mounted display, then only the optical modules move, but a rotation force acts on the light guide plates causing deformation or damage
Solution Approach 1:
The rotation restricting unit is designed to preemptively counteract the rotation force that occurs during removal. By providing preliminary resistance against rotational movement, it prevents the light guide plates from deforming or damaging when the frame gets stuck during removal operations.
4Adaptability or versatility
If the temple part is stretched outward when wearing the frame, then the frame is adjusted to fit, but deformation of the optical modules occurs causing variation in convergence angles
Solution Approach 1:
The rotation restricting unit is pre-installed on the light guide plates before the frame is worn or adjusted. This preliminary setup ensures that when the temple part is stretched outward for fitting adjustment, the light guide plates are already protected from deformation, thereby maintaining stable convergence angles throughout the adjustment process.
Data Source
AI summary
[Problem] Proposed is a head-mounted display capable of preventing deformation or damage of an image display apparatus due to concentration of an external force on a part of the image display apparatus. [Solution] A head-mounted display includes a frame that is worn on a head of an observer, an image display apparatus that is connected to a central part of the frame in a left-right direction and that includes an image forming apparatus and an optical member that is connected to the image forming apparatus and arranged in front of left and right eyes of the observer, and a rotation restricting unit that is arranged opposite to, across a predetermined gap in a front-rear direction, one of the optical member and an extended part extending from the optical member.