Micro Lens Array Light Efficiency in XR Glass Devices
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Solution Overview
Problem
Existing AR/VR smart glasses suffer from low light efficiency, leading to image quality degradation and increased power consumption, which results in bulky and heavy devices due to the use of optical waveguides with low transmittance.
Innovation Solution
The integration of a micro-OLED-type image display terminal with a Micro Lens Array (MLA) and optical devices, where the MLA is designed to maximize light efficiency by corresponding micro lenses to red, green, and blue light sources, and includes a cover layer with a refractive index matching the substrate, optimizing light focusing and collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If optical waveguides with low transmittance are used in AR/VR smart glasses, then the device can be compact in size, but light efficiency decreases and power consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive index of the cover layer to match the substrate (both set to 1.5), and by precisely controlling the thickness parameters (cover layer: 50-200μm, adhesive layer: 1-10μm) to maximize light transmittance while maintaining device compactness
Solution Approach 2:
The patent uses composite material structure combining cover layer, adhesive layer, and substrate with specific refractive index matching, creating an optimized optical path that improves light efficiency without increasing device volume
2Volume of moving object
If optical waveguides with low transmittance are used in AR/VR smart glasses, then the device can be compact in size, but device weight increases due to additional optical components
Solution Approach 1:
The patent employs thin film structures with optimized thickness (cover layer: 50-200μm, adhesive layer: 1-10μm) that provide necessary optical functionality while minimizing additional weight, achieving compact design without heavy optical components
Solution Approach 2:
By optimizing the thickness and refractive index parameters of each layer, the patent achieves high light efficiency with minimal material usage, reducing device weight while maintaining compact form factor
3Loss of energy
If micro lenses are spatially corresponding to multiple RGB light sources in the display unit, then light efficiency is maximized, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the optical system into distinct functional layers (cover layer, adhesive layer, substrate) with the micro lens array and light sources positioned at specific intervals, allowing for modular manufacturing and alignment while maximizing light efficiency through spatial correspondence
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 enhances light efficiency, reduces energy consumption, and minimizes the thickness and weight of the XR glass device, allowing for more comfortable and efficient extended Reality experiences.
Implementation Method 1
a Micro Lens Array (MLA) in which respective micro lenses spatially correspond to multiple red (R) light sources, green (G) light sources, and blue (B) light sources
Implementation Method 2
a cover layer between the panel and the micro lens array, the cover layer having the same refractive index as the substrate of the micro lens array
Data Source
AI summary
Disclosed herein is an extended Reality (XR) glass device. The XR glass device may include a display unit, an optical waveguide, an in-coupler for in-coupling an image output from the display unit to the optical waveguide, and an out-coupler for out-coupling the image propagated along the optical waveguide to an eye, and the display unit may include a Micro Lens Array (MLA) in which respective micro lenses spatially correspond to multiple red (R) light sources, green (G) light sources, and blue (B) light sources.