Light Guide Plate Diffraction Grating Groups for XR Resolution
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Solution Overview
Problem
Existing light guide plates for Cross Reality applications suffer from limitations in image quality due to inefficiencies in light use and resolution.
Innovation Solution
A light guide plate design featuring an incident part for diffraction, a path for internal total reflection, and an output part with multiple diffraction grating groups in a two-dimensional arrangement, which includes diffraction gratings that direct light outward, inward, and toward the observer's pupil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional light guide plates are used, then the device structure is simple, but light use efficiency and image quality are insufficient
Solution Approach 1:
The output part is divided into multiple diffraction grating groups (first, second, and third diffraction grating groups) with different orientations and functions. Each group handles specific light directions, enabling efficient light utilization while maintaining a systematic and manufacturable structure.
Solution Approach 2:
Different regions of the output part are assigned different diffraction grating configurations tailored to their specific functions. The first diffraction grating group uses one orientation for outward light diffusion, the second group uses another orientation for inward light diffusion, and the third group uses a third orientation for direct pupil output, optimizing light use efficiency locally in each region.
2Ease of manufacture
If conventional light guide plates are used, then the device structure is simple, but resolution and image quality are insufficient
Solution Approach 1:
The output part is segmented into multiple diffraction grating groups with different orientations, allowing precise control over light diffusion in specific directions. This segmentation enables high resolution by directing light precisely to the observer's pupil while maintaining manufacturability through systematic group organization.
Solution Approach 2:
The diffraction grating groups are arranged with different orientations rather than uniform symmetry. The first, second, and third diffraction grating groups have different grating orientations optimized for their respective functions, enabling precise light control and high image quality while remaining manufacturable.
3Use of energy by moving object
If multiple diffraction grating groups are added to improve light use efficiency, then light use efficiency improves, but device complexity increases
Solution Approach 1:
Multiple diffraction grating groups are merged into a single integrated output part structure. The first, second, and third diffraction grating groups are combined in one component that can be manufactured as a unified element, achieving high light use efficiency without proportionally increasing device complexity.
Solution Approach 2:
The output part serves multiple functions simultaneously by incorporating different diffraction grating groups with different orientations. This single component handles outward light diffusion, inward light diffusion, and direct pupil output, reducing the need for separate components and minimizing overall device complexity.
4Manufacturing precision
If diffraction grating groups with different orientations are used, then image quality improves, but wavefront turbulence increases
Solution Approach 1:
Each diffraction grating group is optimized for its specific local function with appropriate orientation and diffraction characteristics. The first group is optimized for outward diffusion, the second for inward diffusion, and the third for direct output, minimizing wavefront distortion in each region while maintaining overall image quality.
Solution Approach 2:
Instead of using uniform diffraction grating orientations that may cause wavefront turbulence, the invention inverts the approach by using deliberately different orientations for different grating groups. This controlled variation is optimized to achieve high image quality while managing wavefront characteristics through functional differentiation.
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 design enhances image quality by improving light use efficiency and resolution, reducing wavefront turbulence, and minimizing the size of the light guide plate.
Implementation Method 1
an incident part configured to diffract incident light into the light guide plate
Implementation Method 2
a path configured to guide the light diffracted into the light guide plate by the incident part by internal total reflection
Implementation Method 3
an output part configured to diffract the light guided by the path and output the light toward an observer's pupil
Implementation Method 4
the output part has a plurality of diffraction grating groups in a two-dimensional arrangement
Data Source
AI summary
To improve image quality by improving light use efficiency and resolution. Provided is a light guide plate including an incident part configured to diffract incident light into the light guide plate, a path configured to guide the light diffracted into the light guide plate by the incident part by internal total reflection, and an output part configured to diffract the light guided by the path and output the light toward an observer's pupil, the output part has a plurality of diffraction grating groups in a two-dimensional arrangement, the plurality of diffraction grating groups includes, in front view, at least one of a diffraction grating configured to diffract the light outward from the output part, a diffraction grating configured to diffract the light inwardly with respect to the output part, and a diffraction grating configured to diffract the light toward an observer's pupil.