Holographic Optical Element for Multiple Depth of Field in AR Glasses
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Solution Overview
Problem
Current holographic optical elements struggle to achieve multiple depths of field, limiting their ability to provide a rich and immersive visual experience, especially in augmented reality applications where depth perception is crucial.
Innovation Solution
A holographic optical element is designed with multiple groups of interference fringes, each formed by specific signal and reference light angles and focal lengths, allowing for the recording and reconstruction of images at different depths of field, integrated into a thin and transparent substrate for use in augmented reality glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional holographic optical element records only single-depth information, then the device complexity is low, but the depth of field information is insufficient
Solution Approach 1:
The patent divides the holographic optical element into multiple functional regions, each recording interference fringes for different depth of field information. By segmenting the recording process into multiple exposures with different optical configurations, the element can store and reconstruct multiple depth planes simultaneously, resolving the contradiction between information quantity and device complexity
Solution Approach 2:
The patent extends the holographic recording from traditional single-plane amplitude modulation to multi-dimensional wavefront modulation by incorporating phase information through lens-based optical paths. This dimensional expansion allows encoding of multiple depth of field layers within the same physical medium, increasing information capacity without proportionally increasing device complexity
2Quantity of substance
If multiple groups of interference fringes are recorded to achieve multiple depths of field, then the depth perception is enhanced, but the manufacturing precision requirement increases
Solution Approach 1:
The patent systematically varies key recording parameters including incident angles of signal and reference lights, lens focal lengths, and optical path configurations across multiple exposure steps. By controlling these parameter changes precisely, the method enables recording of multiple depth of field layers with distinct optical characteristics, increasing wave-front information storage while managing manufacturing precision through parameter optimization
Solution Approach 2:
The patent employs composite optical structures combining transparent substrates with recorded interference fringe patterns, integrating multiple functional layers within a single element. This composite approach allows simultaneous storage of multiple depth of field information sets, enhancing the quantity of stored wave-front information while maintaining manufacturability through integrated design
3Adaptability or versatility
If different incident directions and focal lengths are used for multiple interference fringes, then the adaptability for different depths is improved, but the ease of manufacture decreases
Solution Approach 1:
The patent designs a universal holographic optical element structure that can perform multiple functions by recording different interference fringe patterns for various depth of field requirements. The same physical element adapts to different optical configurations during recording, enabling it to serve multiple depth reconstruction purposes without requiring separate devices for each function, thus improving adaptability while maintaining manufacturing feasibility
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 solution enables the holographic optical element to effectively increase storage density for wave-front information, enhance depth perception, and provide a rich visual experience by allowing multiple depths of field to be presented simultaneously, improving the practicality and user experience in augmented reality applications.
Implementation Method 1
at least two groups of interference fringes are recorded in the recording material layer, and each group of the interference fringes includes a first interference fringe and a second interference fringe
Implementation Method 2
The holography refers to technology of recording the amplitude and phase distribution of light waves on a photographic film or a dry sheet
Implementation Method 3
The holographic optical element is a diffractive optical element based on the principle of diffraction
Data Source
AI summary
A holographic optical element and a manufacturing method thereof, an image reconstruction method, and augmented reality glasses are disclosed. The holographic optical element includes a substrate, and a recording material layer in which at least two groups of interference fringes are recorded; each group includes a first interference fringe formed by a first signal light and a first reference light respectively incident from opposite sides of the recording material layer, and a second interference fringe formed by a second signal light and a second reference light respectively incident from opposite sides of the recording material layer; the second signal light passes through a lens before incidence; incident angles of the first signal light and the second reference light are equal; incident directions of the first signal light corresponding to respective groups are different, and focal lengths of the lenses are not equal.