VR Lens Insert Detection Using Eye-Tracking Glint Reflections
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Solution Overview
Problem
Extended reality headsets like VR HMDs often lack space for users' prescription eyeglasses, leading to discomfort due to field of view mismatch and optical distortions caused by additional prescription lenses.
Innovation Solution
A system that detects the presence of prescription lens inserts in VR HMDs using eye tracking light sources and sensors, adjusts virtual image rendering to correct for optical distortions, and allows users to attach personalized lenses directly to the HMD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If users wear prescription eyeglasses with VR HMDs, then vision correction is achieved, but field of view mismatch and optical distortions occur
Solution Approach 1:
The patent introduces an intermediary detection system using eye tracking light sources and sensors to detect the presence and optical characteristics of prescription lenses. This intermediary detection enables the system to automatically adjust rendering parameters to compensate for optical distortions, resolving the contradiction between maintaining vision correction and avoiding field of view mismatch.
Solution Approach 2:
The system dynamically changes rendering parameters such as field of view angle, distortion correction factors, and optical characteristics based on detected prescription lens properties. By adjusting these parameters in real-time, the system maintains accurate vision correction while eliminating optical distortions and field of view mismatch.
2Weight of moving object
If VR HMD bulk and weight are decreased, then comfort and convenience are improved, but space for prescription eyeglasses is reduced
Solution Approach 1:
The patent extracts the prescription lens accommodation function from the traditional eyeglasses-and-HMD combination and integrates it directly into the HMD structure. The prescription lens holder and lens insertion mechanism are incorporated into the HMD frame, eliminating the need for separate eyeglasses and reducing overall bulk while maintaining vision correction capability.
Solution Approach 2:
The prescription lens holder is nested within the HMD frame structure, with the lens positioned inside the optical path. This nested configuration allows the prescription lens to be accommodated within the reduced HMD volume without increasing external dimensions or weight, resolving the contradiction between compact size and vision correction space.
3Reliability
If prescription lens inserts are added to VR HMDs, then vision correction is achieved, but device complexity increases
Solution Approach 1:
The system implements self-service functionality where the eye tracking sensors automatically detect the presence of prescription lenses and the system autonomously adjusts rendering parameters. This self-service approach eliminates the need for manual configuration or complex user input, reducing operational complexity while maintaining vision correction capability.
Solution Approach 2:
The prescription lens holder is designed with multi-functionality: it provides mechanical support for the lens, incorporates eye tracking light sources for detection, includes sensors to detect lens presence and optical characteristics, and integrates with the rendering system. This universal design reduces overall system complexity by combining multiple functions into a single integrated component.
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
Enables comfortable VR experiences by accommodating prescription lenses within the HMD, correcting for distortions and ensuring accurate virtual image rendering.
Implementation Method 1
receive signals from at least one light sensor in a head-mounted device (HMD) representing glints reflected from an eye of a person wearing the HMD
Data Source
AI summary
A person's prescription lens holder that is configured to fit on an HMD is configured for modifying eye tracking glint reflections to detect the presence of the prescription lens holder and thus alert the playback system that a prescription lens is in use and may distort the projected video, requiring correction. In addition or alternatively, a computer readable code may be disposed on the holder for facilitating look up of the prescription parameters to enable correction of the video presentation to account for the prescription lens.