Wearable Heads-Up Display Pupil Tracking Light Adjustment
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Solution Overview
Problem
Wearable heads-up displays (WHUDs) face challenges in providing uniform image intensity and color balance due to variations in the position of the user's pupil relative to the eyebox, leading to non-uniformities across the field of view.
Innovation Solution
A method and system that utilize a light source, spatial modulator, and display optic, with a controller to generate and adjust output light based on an image correction map, which accounts for pupil position and size, to reduce intensity and color balance non-uniformities by controlling the light source and polarization, and directing the adjusted light into the user's field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the output light is adjusted based on pupil position and size, then image uniformity is improved, but device complexity increases
Solution Approach 1:
The system pre-calculates and stores correction maps for various pupil positions and sizes before actual operation. During operation, the appropriate correction map is selected based on detected pupil parameters, avoiding real-time complex calculations and enabling uniform image output across different viewing conditions
Solution Approach 2:
The system detects the user's pupil position and size in real-time, uses this feedback to select or adjust the appropriate correction map, and dynamically modifies the output light accordingly. This closed-loop feedback mechanism ensures continuous image uniformity adaptation to changing viewing conditions
2Adaptability or versatility
If multiple correction maps are stored for different pupil positions, then adaptability is improved, but memory requirements increase
Solution Approach 1:
Instead of storing complete correction maps for all possible pupil positions, the system stores correction data only for specific discrete pupil positions and sizes. The correction maps are constructed from localized correction values that can be interpolated or combined, reducing overall storage requirements while maintaining adaptability across the full range of pupil variations
Solution Approach 2:
The correction data is segmented into discrete correction maps corresponding to specific pupil positions and sizes. Each correction map contains correction values for specific regions of the field of view, allowing the system to store manageable portions of correction data that can be selectively applied based on detected pupil parameters
Data Source
AI summary
There is provided a method of operating a wearable heads-up display (WHUD). The WHUD may include a light source, a spatial modulator, and a display optic. The method may include generating, by the light source, an output light to form an image viewable by a user of the WHUD. The method may also include receiving a position of a pupil of the user relative to an eyebox of the WHUD, and obtaining an image correction map based on the position of the pupil. Moreover, the method may include adjusting the output light to form an adjusted output light. The adjusted output light may be adjusted based on the image correction map to reduce at least one of an intensity non-uniformity and a color balance non-uniformity of the image. The method may also include directing, by the display optic, the adjusted output light into a field of view of the user.