Dynamic Fresnel Projector for Multi-Depth AR Displays
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Solution Overview
Problem
Conventional stereoscopic AR and VR configurations cause eye fatigue, headaches, and discomfort due to mismatched vergence and accommodation, failing to naturally integrate virtual and real-world imagery, and are limited by the trade-off between image quality and device size.
Innovation Solution
A system generating multi-depth image sequences using light sources and modulation arrays that project light onto voxels at different depths, shifting phase according to modulation patterns, and utilizing a diffractive optical assembly to mimic natural light diffractive effects, allowing for comfortable and natural presentation of virtual and real-world imagery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional stereoscopic AR and VR configurations are used, then three-dimensional perspective is perceived by the human visual system, but eye fatigue, headaches, and discomfort occur due to mismatched vergence and accommodation
Solution Approach 1:
The patent changes the optical parameters of the display system by implementing variable focus capability that allows the focal plane to dynamically adjust to match the vergence distance. This enables the accommodation-vergence relationship to be maintained, eliminating eye fatigue while preserving 3D perception. The system modifies the focal length parameter in real-time to correspond with the perceived depth of virtual objects.
Solution Approach 2:
The patent introduces dynamic adaptability to the stereoscopic display system through variable focus mechanisms. Instead of fixed focal planes, the system continuously adjusts focus distance to match the user's vergence movements, creating a dynamic coupling between accommodation and vergence that mimics natural vision and prevents discomfort.
2Volume of moving object
If imaging modules are integrated into wearable devices to maintain small size, then device portability is improved, but image quality deteriorates
Solution Approach 1:
The patent implements a nested optical architecture where multiple optical functions (display, focusing, waveguide integration) are layered within each other. The variable focus mechanism is integrated within the existing wearable form factor, and the diffractive optical elements are embedded within waveguide structures, achieving high image quality without increasing overall device volume.
Solution Approach 2:
The patent employs thin-film optical components including diffractive optical elements and waveguide structures that provide sophisticated optical functionality in extremely compact form factors. These thin film technologies enable high-quality image processing and variable focus control without adding significant bulk to the wearable device.
3Adaptability or versatility
If virtual image elements are presented amongst real-world imagery elements, then augmented reality experience is created, but natural integration and comfort are compromised
Solution Approach 1:
The patent dynamically adjusts optical parameters including focal distance and vergence alignment to match the spatial relationship between virtual and real-world elements. By varying the focal plane position and alignment in real-time, the system creates seamless integration between virtual overlays and the physical environment, enhancing naturalness and user comfort.
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 system effectively addresses eye fatigue and discomfort by aligning with the human accommodation-vergence reflex, providing a comfortable and natural presentation of virtual and real-world imagery without the trade-offs in image quality and device size.
Implementation Method 1
shifting phase according to modulation patterns
Implementation Method 2
utilizing a diffractive optical assembly to mimic natural light diffractive effects
Data Source
AI summary
A system for generating multi-depth image sequence comprising a modulation array. The modulation array comprising a plurality of light modulators which may shift light incident upon the modulators by a number of degrees. The plurality of light modulators may shift light in concert according to a modulation shift pattern. The modulation shift pattern can be configured to focus incident light to a voxel or to form a 3-D image. One or more modulation shift patterns can be changed or cycled through to raster one or more image objects in one or more image depth planes.