Head-Mounted Display Position Correction for Glasses Frames
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Solution Overview
Problem
Head-mounted displays (HMDs) with frames shaped like glasses experience deformation when worn, causing the spatial position of virtual images to shift, leading to increased convergence angle and observer fatigue, which existing solutions attempt to address by increasing frame rigidity, resulting in weight and cost issues.
Innovation Solution
A head-mounted display design where image generating devices are placed outside the eyes and coupled via a center frame, with light guide means positioned closer to the face, ensuring minimal displacement during frame deformation, maintaining convergence angle stability without increasing frame rigidity or weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If frame rigidity is increased to prevent deformation, then spatial position stability is improved, but weight and manufacturing cost increase
Solution Approach 1:
The patent introduces a position correction mechanism as an intermediary system that actively compensates for frame deformation. This mediator detects the actual positions of image generating devices and light guide means, calculates deviations from predetermined positions, and generates correction signals to adjust these components back to their correct positions, thereby maintaining spatial stability without requiring increased frame rigidity
Solution Approach 2:
The patent dynamically changes the positional parameters of image generating devices and light guide means in response to detected frame deformation. By adjusting these parameters in real-time based on sensor feedback, the system maintains optimal spatial relationships despite frame flexibility, avoiding the need for rigid heavy materials
2Stability of the object's composition
If frame rigidity is increased to prevent deformation, then spatial position stability is improved, but manufacturing cost increases
Solution Approach 1:
The patent introduces a position correction mechanism as an intermediary system that actively compensates for frame deformation. This mediator detects the actual positions of image generating devices and light guide means, calculates deviations from predetermined positions, and generates correction signals to adjust these components back to their correct positions, thereby maintaining spatial stability without requiring increased frame rigidity
Solution Approach 2:
The patent dynamically changes the positional parameters of image generating devices and light guide means in response to detected frame deformation. By adjusting these parameters in real-time based on sensor feedback, the system maintains optimal spatial relationships despite frame flexibility, avoiding the need for rigid heavy materials
3Stability of the object's composition
If image generating devices are placed outside the eyes and coupled via center frame, then convergence angle stability is improved, but device complexity increases
Solution Approach 1:
The patent divides the HMD system into distinct functional modules: image generating devices positioned outside the eyes, light guide means for directing light, sensors for detecting positions, and a control unit for processing data and generating correction signals. This segmentation allows each component to be optimized independently and simplifies the overall structural design while maintaining convergence stability
Solution Approach 2:
The patent replaces complex mechanical coupling mechanisms with an optical-mechanical hybrid system. Instead of relying solely on rigid mechanical connections to maintain positional relationships, the system uses light guide means to transmit images and sensors to detect positions, substituting mechanical complexity with optical and electronic solutions
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
The design effectively prevents displacement of image generating devices and light guide means during frame deformation, maintaining consistent convergence angles and avoiding increased weight and cost, thus enhancing user comfort and display stability.
Implementation Method 1
light guide means for guiding the light and emitting the light toward the eye of the observer
Implementation Method 2
The first deflecting member 130 reflects the light incident on the light guide plate 121 so that the incident light is totally reflected in the light guide plate 121
Implementation Method 3
the second deflecting member 140 emits the light, which propagates in the light guide plate 121 by total reflection, from the light guide plate 121
Implementation Method 4
a collimating optical system 112 for collimating light emitted from the pixels of the image forming device 111
Implementation Method 5
The first and second diffraction grating members 330 and 340 are mounted on a second surface 323 of the light guide plate 321 parallel to the first surface 322
Data Source
AI summary
A head-mounted display includes a frame shaped like glasses to be worn on the head of an observer, two image display apparatuses respectively including image generating devices to be placed outside the eyes of the observer, and light guide devices attached to the image generating devices and provided closer to the center of the face of the observer than the image generating devices as a whole, light emitted from the image generating device entering the light guide devices, and being guided and emitted from the light guide devices toward the eyes of the observer, and a coupling member configured to couple the image generating devices and attached to a center portion of the frame between the eyes of the observer.