Eye Tracking Apparatus for AR Head Mounted Display Alignment
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Solution Overview
Problem
Current augmented reality (AR) and virtual reality (VR) head mounted displays (HMDs) often cause dizziness and visual discomfort due to improper fitting, leading to a decline in user experience and interest.
Innovation Solution
A head mounted display apparatus equipped with an eye-tracking apparatus that includes a first lens group, a light splitting device, a display, an image sensor, and light sources, which projects reference marks and captures detection images to accurately track the user's eye, alleviating misalignment and strabismus issues, thereby enhancing visual comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional HMD optical products are used without eye-tracking alignment, then device complexity is reduced, but visual comfort and user experience deteriorate due to dizziness and misalignment
Solution Approach 1:
The eye-tracking apparatus performs preliminary alignment detection before the user fully engages with the HMD content. The system captures images of the user's eye position, detects alignment status, and provides guidance adjustments before visual discomfort occurs, preventing dizziness and misalignment issues proactively
Solution Approach 2:
The patent introduces an intermediary eye-tracking apparatus that mediates between the HMD optical system and the user's eye. This intermediary device includes image capture units, light sources, and processing components that bridge the gap between the fixed HMD optics and the variable user eye position, enabling real-time alignment detection and correction
2Measurement precision
If eye-tracking apparatus with multiple components is added, then measurement precision of eye position is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functional components into an integrated eye-tracking apparatus: image capture units, light sources, processing units, and guidance systems are combined into a single cohesive device that can be attached to the HMD. This consolidation achieves precise eye position measurement while managing system complexity through integration rather than separate components
Solution Approach 2:
The eye-tracking apparatus is designed with multi-functionality to justify its complexity: it captures eye images, detects alignment status, provides real-time feedback, and guides user adjustment. This universal device performs multiple functions that collectively improve visual comfort and measurement precision, making the added complexity worthwhile
3Ease of operation
If proper alignment guidance is provided, then visual comfort is improved, but loss of time occurs during alignment adjustment
Solution Approach 1:
The system implements real-time feedback by continuously monitoring eye position through image capture, comparing it against optimal alignment parameters, and providing immediate guidance feedback to the user. This closed-loop feedback mechanism enables quick self-correction without requiring multiple adjustment iterations, reducing the time loss during alignment while improving visual comfort
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 solution effectively reduces dizziness and visual discomfort by accurately tracking the user's eye and providing guidance for proper alignment, significantly improving the AR/VR experience and maintaining user interest.
Implementation Method 1
The light splitting device receives a first beam, generates a second beam, and transmits the second beam to the second surface of the first lens group
Implementation Method 2
The display projects a reference mark to a target area
Implementation Method 3
The image sensor captures a detection image on the target area through the first lens group, the light splitting device, and the second lens group
Implementation Method 4
The light sources are disposed around the image sensor and project a plurality of beams to the target area through the first lens group, the light splitting device, and the second lens group
Data Source
AI summary
An eye-tracking apparatus includes a first lens group, a light splitting device, a display, an image sensor, a second lens group, and a plurality of light sources. The light splitting device receives a first beam, generates a second beam, and transmits the second beam to a second surface of the first lens group. The display projects a reference mark to a target area through the light splitting device and the first lens group. The image sensor captures a detection image on the target area through the first lens group, the light splitting device, and the second lens group. The second lens group is disposed between the light splitting device and the image sensor. The light sources are disposed around the image sensor and project a plurality of beams to the target area through the first lens group, the light splitting device, and the second lens group.