Eye Tracking Feedback for Near-Eye Optic Alignment
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Solution Overview
Problem
Near-eye display devices, such as see-through head-mounted displays, face challenges in aligning the near-eye optics with the user's eyes, leading to misalignment issues that affect the viewing experience due to small exit pupils and decaying optical performance towards the edges, making it difficult for users to achieve optimal adjustment.
Innovation Solution
The method involves directing positioning light to the user's eye, detecting its reflection, and determining the distance between the eye and the near-eye optic to assess misalignment, providing feedback for adjusting the device to align the optic with a target location, either automatically or through user recommendations, using multiple positioning light sources and eye-tracking cameras to enhance precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the near-eye display device is positioned close to the user's eyes to achieve see-through augmented reality display, then the display can be worn on the user's head with direct eye positioning, but misalignment between the near-eye optic and target optic location occurs leading to degraded optical performance
Solution Approach 1:
The system provides real-time feedback to the user about the alignment status of the near-eye optic with the target optic location. The feedback mechanism includes detecting the user's eye position and providing guidance information to help the user adjust the device to achieve proper alignment, thereby resolving the contradiction between ease of positioning and alignment precision.
Solution Approach 2:
The system enables the user to perform self-adjustment of the device alignment through provided feedback. The user can independently position and align the near-eye display by following the system's guidance, eliminating the need for complex external alignment tools or professional assistance while achieving precise alignment.
2Reliability
If the exit pupil size is reduced to improve optical performance at the center, then the optical performance decays towards the edges, but this makes it more difficult for users to achieve optimal adjustment
Solution Approach 1:
The system provides feedback information to guide users in achieving optimal adjustment of the near-eye optic position. This feedback helps users compensate for the reduced exit pupil size and ensures proper alignment even with smaller pupils, maintaining optical performance while ease of adjustment.
3Measurement precision
If multiple positioning light sources and eye-tracking cameras are used to enhance alignment precision, then the alignment accuracy improves, but the device complexity increases
Solution Approach 1:
The positioning light sources and eye-tracking cameras serve multiple functions: they detect eye position for alignment feedback, track user gaze, and potentially enable other eye-tracking features. This multi-functionality justifies the added components by providing multiple benefits from a single system integration, reducing the perceived complexity increase.
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 approach simplifies the adjustment process, helping users achieve precise alignment of the near-eye display system, reducing vignetting and other optical effects, and ensuring a better viewing experience by providing real-time feedback and adjustment recommendations.
Implementation Method 1
directing positioning light to an eye of a user, and detecting the positioning light reflected from the eye of the user
Data Source
AI summary
A method of detecting eye location for a head-mounted display system includes directing positioning light to an eye of a user and detecting the positioning light reflected from the eye of the user. The method further includes determining a distance between the eye and a near-eye optic of the head-mounted display system based on attributes of the detected positioning light, and providing feedback for adjusting the distance between the eye and the near-eye optic.