AR Eye-Projection Light Guide Asymmetry for Moiré-Free Imaging
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Solution Overview
Problem
Existing augmented reality devices using micro-displays require bulky optical systems, limiting their compactness and field of view, and are prone to Moiré effects due to regular emission point distributions.
Innovation Solution
A device comprising a stack of light guides with electrically modulatable diffraction gratings and electrodes, where the light guides and electrodes form rectilinear segments inclined at acute angles, increasing the density of emission points while maintaining a pseudo-random distribution to avoid Moiré effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light guides are arranged in a regular grid pattern, then the device structure is simple and easy to manufacture, but Moiré effects occur and image quality deteriorates
Solution Approach 1:
The patent applies asymmetry by arranging light guides and electrodes in a staggered, non-grid pattern where light guides extend in rectilinear segments with acute angles to the longitudinal axis, and electrodes extend in rectilinear segments with acute angles to the lateral axis. This asymmetric configuration breaks the regularity that causes Moiré effects while maintaining manufacturing feasibility through systematic geometric rules.
2Object-affected harmful factors
If emission points are distributed randomly, then Moiré effects are avoided, but the density of emission points decreases and image resolution is reduced
Solution Approach 1:
The patent applies local quality by creating different geometric configurations for light guides and electrodes in different regions. Light guides have rectilinear segments at acute angles to the longitudinal axis, while electrodes have rectilinear segments at acute angles to the lateral axis. This localized geometric variation maintains high emission point density while avoiding global regularity patterns that cause Moiré effects.
3Device complexity
If light guides extend parallel to one another, then the structure is simple, but the number of emission points is limited and image information is reduced
Solution Approach 1:
The patent applies dimensionality change by transitioning from parallel light guide arrangement to rectilinear segments with acute angles to the longitudinal axis. This angular variation in the spatial dimension creates additional emission point positions through the interaction of angled light guides with electrodes, thereby increasing information capacity without significantly complicating the overall device structure.
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 optimized configuration enhances the density of emission points, leading to a higher number of pixels in the formed image, thereby increasing the amount of information contained in each image without the need for bulky optical systems.
Implementation Method 1
each diffraction grating being configured to be electrically modulated so as to extract light propagating through the light guide
Implementation Method 2
electrically modulatable diffraction gratings... electrically modulated so as to extract light
Implementation Method 3
each emission point of the same subset emits a light wave that propagates in the same direction to the pupil of the eye, so as to form a single spot of light on the retina
Data Source
AI summary
Device for projecting an image onto an eye, the device comprising a stack comprising light guides, each light guide being coupled to a plurality of diffraction gratings, electrodes, each electrode being associated with a plurality of diffraction gratings of various light guides, each electrode being configured to activate each diffraction grating with which it is associated, a holographic film, the device being characterized in that each light guide extends along a longitudinal axis, in such a way as to form rectilinear segments, two successive rectilinear segments of a given light guide making two different acute angles to the longitudinal axis.