Chromaticity Corrective Coating for AR Back Reflection
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Solution Overview
Problem
Augmented reality (AR) systems reflect chromatic light back into the ambient environment, causing disturbing chromaticity blemishes that affect the user's view and perception of the environment.
Innovation Solution
An optical coating, referred to as a chromaticity corrective coating (CCC), is applied to the light guiding optical elements (LOE) to complement the reflectivity of back-reflecting components, ensuring that the reflected light appears substantially white across a specific range of angles, thereby minimizing chromaticity blemishes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the LOE uses reflecting optical components to deliver virtual images, then the virtual image delivery efficiency is improved, but chromatic back-reflection is generated that disturbs the user's view of the ambient environment
Solution Approach 1:
The patent applies a chromaticity corrective coating (CCC) that converts the harmful chromatic back-reflection into beneficial white light reflection. The CCC is designed with specific reflectivity characteristics that complement the LOE's back-reflecting components, transforming the disturbing chromatic reflection into perceived white light that does not disturb the user's view of the ambient environment.
Solution Approach 2:
The patent modifies the optical parameters of the LOE by applying a CCC with specifically engineered reflectivity properties. The CCC has a reflectivity spectrum that complements the LOE's back-reflection characteristics, changing the overall chromaticity of the reflected light from disturbing chromatic to perceived white light across a specific angular span.
2Ease of operation
If the LOE reflects ambient light back into the environment, then the user can see the ambient environment through the transparent LOE, but the reflected light appears chromatic and disturbing
Solution Approach 1:
The CCC transforms the harmful chromatic reflection into beneficial white light reflection. By designing the CCC with complemental reflectivity to the LOE's back-reflecting components, the system converts the disturbing chromaticity blemishes into perceived white light that maintains ambient visibility without user disturbance.
Solution Approach 2:
The patent creates a composite optical system by applying the CCC onto the LOE surface. This composite structure combines the LOE's transparency for ambient visibility with the CCC's chromaticity correction properties, achieving both clear ambient viewing and elimination of chromatic disturbances.
3Reliability
If the CCC is designed to correct chromaticity over a wide angular span, then the correction effectiveness is improved, but the coating complexity and manufacturing difficulty increase
Solution Approach 1:
The patent addresses the angular dependency of chromaticity correction by designing the CCC with reflectivity characteristics that are optimized for a specific angular span rather than all angles. This parameter optimization approach achieves reliable correction effectiveness within the target viewing zone while managing coating design 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 CCC effectively moderates chromatic back-reflection, ensuring that the ambient light reflected back into the environment appears white, reducing visual disturbances and enhancing the user's experience by eliminating chromaticity blemishes.
Implementation Method 1
The CCC is designed having a reflectivity for ambient light incident on the CCC from the environment that complements reflectivity of the at least one back-reflecting component to provide a corrected reflectivity for the AR system
Data Source
AI summary
A method of moderating chromaticity of ambient light in an environment reflected back into the environment by a component comprised in a lens of glasses through which a user of views the environment, the method comprising: determining a first set of tristimulus values that characterizes ambient light reflected by the component surface as a function of angle of reflection Θ in a bounded span of angles of reflection; determining a second set of tristimulus values for angles in the bounded span of angles so that light characterized by the second set of tristimulus values combined with light reflected by the component would be perceived substantially as white light; and providing an optical coating that reflects ambient light from the environment so that the reflected light is substantially characterized by the second set of tristimulus values.