Near-eye Display Waveguide Tilted Light-splitting Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Near-eye display devices suffer from the issue of dark stripes on images due to uneven brightness, caused by overlapping areas perceived by the eye as a result of the design of light-splitting surfaces.
Innovation Solution
The design incorporates a first waveguide member with tilted light-splitting surfaces and increasing gaps between them, aligned with the visual axis of the eye, to minimize overlapping areas and reduce dark stripe formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light-splitting surfaces are arranged with uniform spacing, then manufacturing is simple, but overlapping areas cause dark stripes on images
Solution Approach 1:
The patent applies local quality by making the spacing between light-splitting surfaces non-uniform. Specifically, the spacing increases in regions where overlapping areas would otherwise occur, as determined by the visual axis of the eye. This local adjustment eliminates dark stripes while maintaining simplicity in other areas.
Solution Approach 2:
The patent changes the spacing parameter between light-splitting surfaces from uniform to non-uniform. The spacing is specifically increased in certain regions based on the visual axis calculation, which prevents overlapping areas and the resulting dark stripes while keeping the overall structure simple.
2Object-affected harmful factors
If gaps between light-splitting surfaces are increased, then overlapping areas are reduced, but device volume increases
Solution Approach 1:
The patent applies local quality by increasing gaps only in specific regions where overlapping areas occur according to the visual axis, rather than uniformly increasing all gaps. This localized approach reduces dark stripes while minimizing the overall volume increase of the waveguide member.
Solution Approach 2:
The patent addresses the overlapping problem by considering the visual axis dimension, which adds a spatial perspective to determine where gaps should be increased. This dimensional approach allows precise control of gap locations to minimize both overlapping and volume increase.
3Illumination intensity
If light-splitting surfaces are tilted, then light reflection to eye is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the tilt angle parameter of light-splitting surfaces to optimize light reflection toward the eye's visual axis. While this improves illumination, it simultaneously increases manufacturing precision requirements, which is a trade-off acknowledged in the patent.
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 configuration effectively reduces the occurrence of dark stripes on images, enhancing image quality by minimizing overlapping areas and improving brightness uniformity.
Implementation Method 1
The plurality of first light-splitting surfaces reflect the image beam transmitted in the first waveguide member to the eye
Data Source
AI summary
A near-eye display device includes an image system and a first waveguide member. The image system is configured to provide an image beam. The first waveguide member is disposed on a transmission path of the image beam and includes a first surface, a second surface, a first light incident end, and a plurality of first light-splitting surfaces. The first light incident end is located on a side of the first surface and the second surface. The image beam enters the first waveguide member through the first light incident end. The first light-splitting surfaces are configured in a tilted manner relative to the first surface and the second surface. On a side away from the first light incident end when taking a visual axis of the direct-vision of an eye of a user as a baseline, a plurality of first gaps increase as located farther from the first light incident end.