See-Through Display Color Correction Using Eye Tracking
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Solution Overview
Problem
Portable eyewear devices, such as smartglasses, suffer from color and brightness non-uniformities across the display field and eyebox due to variations in eye position and gaze direction, which degrade the user experience and are not adequately addressed by simple calibrations.
Innovation Solution
An eyewear device equipped with an infrared emitter and camera system that tracks eye gaze direction and position, using color and intensity calibration maps to dynamically adjust display color and brightness, ensuring uniform perception across varying eye positions and gaze directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical combiner technologies (waveguides, reflectors) are used in AR devices, then see-through display functionality is achieved, but color and brightness non-uniformities are introduced that vary with field point and eye position
Solution Approach 1:
The patent applies local quality by implementing position-dependent color correction. Different regions of the display (different field points and eye positions) are corrected with specific color values tailored to that location. The system determines the current eye position and field point, then applies the appropriate color correction from pre-calibrated lookup tables, ensuring each local area has optimal color uniformity for its specific viewing conditions.
2Device complexity
If simple calibration methods are used, then device complexity is reduced, but color non-uniformities across different eye positions and gaze directions are not adequately corrected
Solution Approach 1:
The patent implements preliminary action by pre-calibrating color correction values for multiple eye positions and field points before actual use. During manufacturing or setup, the system captures images at various predefined positions and stores the corresponding color correction data in lookup tables. When the device is used, the system only needs to determine the current position and retrieve the pre-computed correction values, avoiding complex real-time calculations and reducing operational complexity while maintaining high color uniformity.
3Manufacturing precision
If dynamic eye tracking and color adjustment systems are implemented, then color uniformity across varying eye positions is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements feedback by continuously monitoring eye position through the camera system and using this information to dynamically adjust color correction. The system captures images, determines eye position and field point, retrieves appropriate correction values from pre-calibrated lookup tables, and applies real-time color adjustment. This closed-loop feedback mechanism enables adaptive color uniformity maintenance while leveraging pre-computed data to minimize real-time processing complexity.
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 system provides a dynamically adjusted and uniformly colored and brightened display, enhancing user experience by compensating for changes in eye position and gaze, thus improving the consistency and quality of the visual output.
Implementation Method 1
an infrared emitter to emit a pattern of infrared light and an infrared camera to detect the reflection variations in the emitted pattern of infrared light
Implementation Method 2
detect the reflection variations in the emitted pattern of infrared light
Data Source
AI summary
An eyewear device that accurately and dynamically adjusts color and brightness of a see-through display as a function of a user's eye gaze direction and eye position using a display characteristic map. The display characteristic map is indicative of display characteristics of the see-through display. Color masks are generated as a function of the display characteristic map and the user's eye gaze direction and eye position, and a processor adjusts the see-through display characteristics based on the color masks.