Diffractive Optical Element with Intermediate Underlayer for AR/VR Depth Perception
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Solution Overview
Problem
Conventional virtual and augmented reality systems face challenges in presenting 3D content effectively, leading to unstable imaging, eye strain, and a lack of perceived surface depth due to inadequate accommodation of virtual depth cues, resulting in uncomfortable user experiences.
Innovation Solution
The implementation of a diffractive optical element with a waveguide substrate, surface grating, and an intermediate underlayer of varying refractive indices, along with precise deposition techniques for imprint materials, enhances diffraction efficiency and field of view, allowing for more accurate and comfortable 3D perception by simulating multiple focal planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display systems present virtual content without transparency to real-world visual input, then virtual reality experience is achieved, but accommodation conflict occurs resulting in unstable imaging, eye strain, and lack of surface depth perception
Solution Approach 1:
The patent changes the optical parameters of the display system by introducing variable focus lenses that can dynamically adjust focal length. This allows the system to present virtual content at different focal distances, enabling the accommodative response to correspond to the virtual depth of display points, thereby resolving accommodation conflict and eliminating eye strain while maintaining imaging stability
Solution Approach 2:
The patent implements dynamic focus adjustment capability through variable focus lenses that can change focal length in real-time. This dynamic adaptation allows the system to match the focal plane with the virtual depth of displayed content, resolving the static nature of conventional displays that causes accommodation conflict and improves both imaging stability and user comfort
2Productivity
If diffractive optical elements with multiple layers of varying refractive indices are implemented, then diffraction efficiency and field of view are enhanced, but device complexity increases
Solution Approach 1:
The patent employs composite material structures with multiple layers of different refractive indices (waveguide substrate, underlayer, and grating layer). This composite structure enables enhanced diffraction efficiency and expanded field of view by manipulating light propagation through refractive index variations, while the layered design allows for optimized optical performance without excessive complexity increase
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 provides a more comfortable and immersive 3D experience by accurately simulating depth cues, reducing eye strain and enhancing the field of view, thereby improving the overall quality of virtual and augmented reality displays.
Implementation Method 1
a diffractive optical element with a waveguide substrate, surface grating, and an intermediate underlayer of varying refractive indices, along with precise deposition techniques for imprint materials, enhances diffraction efficiency and field of view
Implementation Method 2
a diffractive optical element (DOE) to receive the light associated with the one or more frames of image data and direct the light to the user's eyes
Data Source
AI summary
Disclosed is an improved diffraction structure for 3D display systems. The improved diffraction structure includes an intermediate layer that resides between a waveguide substrate and a top grating surface. The top grating surface comprises a first material that corresponds to a first refractive index value, the underlayer comprises a second material that corresponds to a second refractive index value, and the substrate comprises a third material that corresponds to a third refractive index value. According to additional embodiments, improved approaches are provided to implement deposition of imprint materials onto a substrate, which allow for very precise distribution and deposition of different imprint patterns onto any number of substrate surfaces.