Angular Occlusion Filter for AR Headset Ghosting
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Solution Overview
Problem
Existing augmented reality headsets suffer from negative user experiences due to unintended interactions between optical components and light, leading to issues like bright and colored spots in the field of view and ghost imagery from residual reflections.
Innovation Solution
An angular occlusion filter (AOF) is introduced, comprising a multilayer stack of optical thin films with functional modules for anti-reflection, polarization adjustment, and angular occlusion. This filter is designed to modulate transmission, reflection, and polarization of light based on incidence angle, wavelength, and polarization, thereby mitigating unwanted light interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical components are used in augmented reality headsets, then light transmission and display functionality are enabled, but unintended light interactions occur causing bright spots, colored spots, and ghost imagery
Solution Approach 1:
An angular occlusion filter is introduced as an intermediary optical component between the display and the user's eye. This filter selectively blocks unwanted light paths (ghost imagery, reflections) while allowing desired light (display content and real-world view) to pass through, thereby mediating the interaction between light and optical components to eliminate harmful effects
Solution Approach 2:
The angular occlusion filter applies different optical properties to different angular regions of light. It allows normal incidence light to pass through while blocking oblique incidence light that causes ghost imagery and reflections. This localized angular selectivity enables the system to maintain high image quality in specific angular ranges while eliminating unwanted light interactions in other angular ranges
2Reliability
If angular occlusion filter is added to mitigate unwanted light interactions, then image clarity and transparency control improve, but device complexity increases
Solution Approach 1:
The angular occlusion filter is designed to perform multiple functions simultaneously: it blocks ghost imagery, eliminates reflections, controls polarization, and manages angular light transmission. By consolidating these multiple optical control functions into a single component, the system achieves improved image clarity without proportionally increasing device complexity
Solution Approach 2:
The angular occlusion filter employs a multilayer composite structure combining different optical materials with specific refractive indices and optical properties. This composite design enables the filter to achieve complex angular selectivity and polarization control in a single integrated component, rather than requiring multiple separate optical elements
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 AOF effectively reduces unwanted light interactions, providing improved transparency and reflection control across different angular and spectral conditions, thus enhancing the user experience by minimizing distractions and improving image clarity.
Implementation Method 1
An angular occlusion filter (AOF) is introduced, comprising a multilayer stack of optical thin films with functional modules for anti-reflection, polarization adjustment, and angular occlusion. This filter is designed to modulate transmission, reflection, and polarization of light based on incidence angle, wavelength, and polarization
Implementation Method 2
An angular occlusion filter (AOF) is introduced, comprising a multilayer stack of optical thin films with functional modules for anti-reflection, polarization adjustment, and angular occlusion
Implementation Method 3
An angular occlusion filter (AOF) is introduced, comprising a multilayer stack of optical thin films with functional modules for anti-reflection, polarization adjustment, and angular occlusion
Data Source
AI summary
An optical element includes a display device and an angular occlusion filter disposed over at least one surface of the display device. The angular occlusion filter may be configured to modulate one or more of transmission, reflection, and polarization of image or ambient light incident upon the display device.