Eyewear Frame Deformation Sensing for Accurate IPD Estimation
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Solution Overview
Problem
Existing eyewear devices, such as smart glasses, struggle with accurately adjusting the field of view and inter-pupillary distance (IPD) to provide an optimal augmented reality experience, leading to vergence accommodation mismatch (VAM).
Innovation Solution
Incorporating sensors to measure deformation and head breadth for estimating IPD, using processors to adjust display images based on detected head or eye movements, and utilizing user profile data for improved IPD estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are added to measure deformation and estimate IPD, then measurement precision of IPD is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical measurement systems with strain sensors that measure deformation electrically. The strain sensors detect frame deformation caused by head breadth, converting a mechanical problem into an electrical measurement problem, thereby improving IPD estimation precision while controlling device complexity.
Solution Approach 2:
The patent introduces frame deformation as an intermediary parameter to estimate IPD. Instead of directly measuring IPD (which is difficult), the system measures the deformation of the eyewear frame caused by the user's head breadth, using this intermediate measurement to infer the IPD value.
2Reliability
If field of view and IPD are adjusted to reduce VAM, then augmented reality viewing experience is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic adjustment of display parameters (field of view and IPD) based on real-time sensor data. The system continuously adapts the display configuration to match the user's actual head breadth and eye movements, transforming a static display system into a dynamic one that responds to user characteristics.
Solution Approach 2:
The patent employs feedback mechanisms where strain sensor data about frame deformation is fed back to the display system to adjust IPD settings. Eye movement tracking data also provides feedback to dynamically adjust the field of view, creating a closed-loop system that continuously optimizes the augmented reality experience.
Data Source
AI summary
An eyewear device including a sensor used to measure deformation of an eyewear frame to estimate an inter-pupillary distance (IPD) of an eyewear user. The sensor is used to determine head breadth (HB) of the user and to estimate the IPD of the user. A processor displays an image on a display of the eyewear as a function of the estimated IPD to improve virtual object rendering for an improved augmented reality (AR) viewing experience while reducing vergence accommodation mismatch (VAM). User profile data, such as age and gender, can be used to generate a more accurate estimated IPD of the user.