Waveguide Aberration Correction via Piezoelectric Sensing
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Solution Overview
Problem
Display assemblies with waveguides suffer from image light aberrations due to movements caused by stress, thermal changes, and physical shocks, leading to image distortion and reduced accuracy in projecting images.
Innovation Solution
A display assembly with piezoelectric movement sensors coupled to the waveguide assembly that monitors and corrects for aberrations in real-time by feeding feedback to a display controller, which can adjust the image light projection or mechanically correct the waveguide shape using actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waveguide assembly is used to project image light, then image content can be displayed, but waveguide movement causes image light aberration and image distortion
Solution Approach 1:
The patent employs movement sensors to detect waveguide assembly displacement and feeds this information back to a display controller. The controller dynamically adjusts image light projection parameters based on the detected movement, compensating for aberrations and maintaining image quality despite waveguide position changes.
Solution Approach 2:
The system changes projection parameters (such as light direction, focal point, or waveguide shape) in response to detected movement. By dynamically adjusting these parameters, the system compensates for the harmful effects of waveguide displacement and maintains accurate image projection.
2Reliability
If movement sensors are added to monitor waveguide assembly, then image light aberration can be corrected, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with a sensor-based detection and control system. Instead of using mechanical actuators to physically adjust the waveguide position, the system uses movement sensors to detect displacement and electronically adjusts projection parameters, simplifying the overall mechanical structure while maintaining correction capability.
3Measurement precision
If sub-micron precision sensors are used to monitor waveguide movement, then small scale movements can be detected, but transmission efficiency may be reduced
Solution Approach 1:
The patent applies movement sensors selectively at specific locations on the waveguide assembly where displacement is most critical to image quality. This localized sensing approach achieves sufficient measurement precision for correction purposes while minimizing the total sensor material in the optical path, thereby preserving light transmission efficiency.
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
Improves image quality by dynamically correcting for waveguide movements, enhancing the durability and accuracy of image projection in artificial reality systems like VR and AR headsets.
Implementation Method 1
The display assembly includes movement sensors (e.g., piezoelectric movement sensors) coupled to the waveguide assembly. The movement sensors may be sub-micron precision sensors that are substantially transparent to both exhibit high sensitivity to small scale movements that affect projected image light
Data Source
AI summary
A display assembly monitors movements in a waveguide assembly and corrects for aberrations in image light caused by the monitored movements. For example, an artificial reality headset may include a display assembly that monitors for changes in shape or displacement of waveguide assemblies that generate three dimensional images for display with a real world environment. The display assembly includes movement sensors (e.g., piezoelectric movement sensors) coupled to the waveguide assembly. The movement sensors monitor the movement of the waveguide assembly and provide the monitored movement to a display controller that generates instructions for correcting aberrations in the image light.