AR Projection Assembly Using Micro-LED Light Combining
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Solution Overview
Problem
Augmented reality (AR) devices face a challenge in achieving high resolution without increasing their overall size, as higher resolution requirements lead to larger display sizes, resulting in increased device volume.
Innovation Solution
The AR projection assembly employs a combination of Micro-LED single-color and dual-color displaying elements, a semi-reflection and semi-transmission light combining element, and a lens assembly with specific focal lengths and refractive indices to combine single-color and dual-color light into a full-color image, optimizing space usage and correcting aberrations for improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display is increased to achieve better display performance, then the display quality is improved, but the size of the display increases, resulting in an increased overall size of the AR device
Solution Approach 1:
The patent segments the display system into multiple specialized optical paths: a first optical path for blue light from a blue light source, and a second optical path for yellow light from a yellow light source. Each path has dedicated optical elements (lenses, waveguides) optimized for its specific wavelength. This segmentation allows compact design of individual paths while achieving high overall resolution through combination of the paths.
Solution Approach 2:
The patent merges multiple optical paths carrying different colors of light (blue light path and yellow light path) into a single combined optical path that delivers full-color high-resolution images to the user's eye. The blue light and yellow light are combined through optical combining elements to form a composite image that maintains high resolution while using compact individual light sources.
2Manufacturing precision
If the display size is increased to achieve high resolution, then the image quality is improved, but the overall volume of the AR device increases
Solution Approach 1:
The patent applies local quality by using different optical elements with properties specifically tailored to their local requirements: blue light optics are designed with parameters optimized for blue wavelength, yellow light optics for yellow wavelength. Each optical element (lenses, waveguides) has locally optimized characteristics (refractive indices, curvatures, thicknesses) that match its specific light source, enabling high image quality in compact form.
Solution Approach 2:
The patent transitions from a single large display plane to a multi-dimensional optical system where light from separate sources (blue and yellow) is combined in optical space. Instead of increasing display area in two dimensions, the system uses a third dimension (optical path combining) to achieve high resolution through superposition of multiple light fields, reducing overall device volume.
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 allows for high-resolution AR projections while minimizing the overall size of the AR device, enhancing user visual experience by correcting field curvature, distortion, and spherical aberrations, and improving angular resolution within a certain field of view.
Implementation Method 1
the light combining element has a semi-reflection and semi-transmission property, and the light combining element reflects the single-color light and transmits the dual-color light
Implementation Method 2
the first lens and the third lens having a positive focal length, and the second lens having a negative focal length
Data Source
AI summary
Disclosed are an AR projection assembly and an AR device, and the AR projection assembly comprises: an image displaying source, the image displaying source including a Micro-LED single-color displaying element and a Micro-LED dual-color displaying element; a light combining element, the light combining element being disposed on light emitting paths of the Micro-LED single-color displaying element and the Micro-LED dual-color displaying element and configured to combine single-color light given off by the Micro-LED single-color displaying element and dual-color light given off by the Micro-LED dual-color displaying element into a full-color image; a lens assembly, the lens assembly including a first lens, a second lens and a third lens which are disposed in sequential proximity to the light combining element on a light emitting path of the light combining element, the first lens and the third lens having a positive focal length, and the second lens having a negative focal length.