Dynamic Distortion Mapping in Worn Head-Worn Displays
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Solution Overview
Problem
Conventional head-worn displays (HWDs) require costly and time-consuming recalibration due to mechanical creep, which introduces distortion, and cannot be customized for individual users without removing the device from service.
Innovation Solution
A binocular display system with an eye tracking system and processor that generates a distortion map based on user-specific gaze angles, allowing for real-time correction of distortion without factory recalibration, using a digital binocular display system with left and right eye image displays and a method to determine and correct distortion using eye tracker data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional test fixture and camera method is used to generate distortion map, then distortion correction is achieved, but the process is expensive and time-consuming requiring manufacturer recalibration
Solution Approach 1:
The HMD performs self-calibration by using its own display system to present test patterns and its own eye tracker to capture eye position data, eliminating the need for external test fixtures and manufacturer recalibration. The device generates and processes its own calibration data autonomously.
Solution Approach 2:
The eye tracker serves as an intermediary device that bridges the gap between the display system and the user's visual system. It captures eye position data that is then used to generate the distortion map, replacing the need for complex test fixtures and camera systems.
2Measurement precision
If conventional test fixture method is used, then distortion map is generated, but it cannot be customized for individual users
Solution Approach 1:
The calibration process is customized for each individual user by capturing their specific eye position data using the eye tracker. Each user's distortion map is generated based on their unique eye characteristics and viewing geometry, providing localized optimization rather than a generic solution.
Solution Approach 2:
The system transitions from a static, factory-set distortion map to a dynamic, user-specific distortion map that can be generated on-demand. The eye tracker continuously captures eye position data, allowing the system to adapt and optimize distortion correction for each user's specific viewing conditions.
3Reliability
If HMD is returned to manufacturer for recalibration, then new distortion map is generated, but this is expensive and removes device from service
Solution Approach 1:
The HMD performs its own recalibration in the field without requiring manufacturer intervention. The device uses its integrated eye tracker and display system to generate new distortion maps autonomously, eliminating the need to remove the device from service and return it to the manufacturer.
Solution Approach 2:
The physical process of returning the device to the manufacturer for recalibration is replaced by an electronic/software-based self-calibration process. The eye tracker data is processed computationally to generate updated distortion maps, replacing the mechanical/recalibration system with a software solution.
4Ease of manufacture
If flexible molded composite components are used, then cost is reduced, but mechanical creep introduces distortion over time
Solution Approach 1:
The eye tracker provides continuous feedback on actual eye position data, which is used to detect and correct distortion caused by mechanical creep. The system continuously monitors and adapts to changes in the optical path, compensating for drift in the composite components over time.
Solution Approach 2:
The system changes the distortion map parameters based on actual eye position measurements rather than relying on fixed mechanical tolerances. When mechanical creep alters the optical path, the eye tracker data drives updates to the distortion correction parameters, maintaining accuracy despite physical component changes.
Data Source
AI summary
A display distortion correction system and method is for a worn display. The worn display includes an image display. The display distortion correction system includes an eye tracking system configured to provide an eye parameter related to viewing the image display, a memory for storing a distortion map, and a processor configured to provide a distortion map. The processor is configured to provide a first test pattern on the image display, record a first set of eye positions associated with viewing the first test pattern, and provide the distortion map in response to the first set of eye positons.