Simultaneous Holographic Grating Recording for Uniform AR Waveguides
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing augmented reality devices using waveguide technology face issues with sequential recording of superimposed holograms, leading to moiré interference, non-homogeneous brightness, and sharpness across the field of view due to mismatches in spatial periods and rotations of holographic planes, requiring complex and laborious processes with significant financial and operational expenditures.
Innovation Solution
A method and system for simultaneous recording of superimposed holographic gratings using a decoherence unit to generate non-interfering recording beams from a single light source, allowing for the formation of superimposed holograms with the same surface period but different spatial periods, adjusted by rotation or linear displacement of the recording material layer and master DOE/HOE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sequential recording of superimposed holograms is used, then the field of view is increased, but moiré interference and non-homogeneous brightness occur due to mismatches in spatial periods and rotations of holographic planes
Solution Approach 1:
The patent combines multiple hologram recordings into a single simultaneous recording process. Multiple recording beams with different spatial periods are generated from a single light source and recorded together in one exposure, eliminating the sequential process that causes cumulative misalignment and moiré effects.
Solution Approach 2:
The patent changes the temporal parameter of the recording process from sequential to simultaneous. By recording all superimposed holograms in a single exposure event, the system eliminates time-dependent misalignment issues while maintaining the ability to create wide field of view through multiple spatial periods.
2Quantity of substance
If sequential recording of superimposed holograms is used, then multiple holograms can be recorded, but the process is laborious and requires significant human resource for adjusting recording parameters
Solution Approach 1:
The patent merges multiple individual recording operations into a single simultaneous recording operation. By generating multiple recording beams from one light source and exposing all holograms at once, the system eliminates the need for repeated parameter adjustments and manual interventions between recordings.
Solution Approach 2:
The patent creates a universal recording system that can produce multiple different holograms simultaneously from a single light source and single exposure event. The system records multiple holograms with different spatial periods in one operation, making the process independent of manual parameter selection for each individual hologram.
3Adaptability or versatility
If sequential recording of superimposed holograms is used, then holograms can be recorded with different spatial periods, but sophisticated optical schemes with precision elements are required
Solution Approach 1:
The patent combines multiple beam generation functions into a single light source with a beam splitting system. Instead of requiring multiple independent laser sources and their associated control systems, one light source generates all necessary recording beams through optical splitting, dramatically reducing device complexity while maintaining spatial period variation.
Solution Approach 2:
The patent creates a universal optical system where a single light source and single exposure setup can produce multiple holograms with different spatial periods. The beam splitting and modulation components enable one system to perform multiple recording functions simultaneously, eliminating the need for complex sequential switching and multiple precision stages.
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
This approach improves the quality of the virtual image by ensuring uniform brightness and clarity across the field of view, simplifying the recording process and reducing production costs by eliminating the need for sequential adjustments and sophisticated optical schemes.
Implementation Method 1
providing the formation of at least two recording beams by the decoherence unit, including splitting the initial beam into at least two recording beams
Implementation Method 2
splitting the initial beam into at least two recording beams
Implementation Method 3
illuminating a recording material layer and one master diffractive optical element/master holographic optical element (master DOE/HOE) comprising at least one preliminarily formed diffraction/holographic grating by said at least two non-interfering recording beams
Implementation Method 4
providing simultaneous formation of at least two superimposed holographic gratings from said one master DOE/HOE on or in the recording material layer
Data Source
AI summary
A method and systems for simultaneous recording of superimposed holographic gratings for augmented reality devices are provided. The method includes: generating a beam by a single light source, directing the beam to a decoherence unit at a predetermined angle, forming at least two recording beams by the decoherence unit by splitting the beam, forming at least two recording channels in the decoherence unit to transmit the at least two recording beams and output them from the decoherence unit, output angles of each of the at least two recording beams being different, illuminating a recording material layer and one master diffractive optical element/master holographic optical element (master DOE/HOE) comprising at least one preliminary formed diffraction/holographic grating by the at least two non-interfering recording beams, simultaneously forming at least two superimposed holographic gratings from the master DOE/HOE on or in the recording material layer.