Polymer Eyepiece Assembly for Uniform Waveguide Gap Control

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Solution Overview

Problem

Polymer eyepiece assemblies in augmented and mixed reality systems face issues with bending and warping due to low elastic modulus and high thermal expansion, leading to non-uniform gaps and image quality deterioration.

Innovation Solution

Fabricate eyepiece assemblies using polymer materials and adhesives with matching thermal expansion coefficients, apply hydrophobic or omniphobic coatings, and use continuous adhesive configurations with microspheres to maintain uniform gaps and reduce bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If polymer materials are used to fabricate eyepiece assemblies, then ease of manufacture and device complexity are improved, but bending and warping occur due to low elastic modulus and high thermal expansion coefficient

Engineering Contradiction:

Improveease of manufactureVSAvoidbending and warping

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent modifies the chemical composition and crosslinking density of the polymer material to achieve an optimized balance between elasticity and dimensional stability. By adjusting polymerization parameters and material formulation, the patent resolves the contradiction between ease of manufacture and resistance to bending/warping.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite structures combining polymer waveguide layers with supporting frameworks and stabilization layers. This composite approach maintains the manufacturing advantages of polymers while incorporating structural elements that prevent bending and warping during fabrication and operation.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If polymer layers are used in eyepiece assemblies, then device complexity is reduced, but non-uniform gaps form between layers leading to image quality deterioration

Engineering Contradiction:

Improvedevice complexityVSAvoidgap uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent introduces intermediary elements such as spacers, support structures, and alignment features between polymer layers. These intermediaries maintain uniform gaps during assembly and operation, preventing direct contact and light leakage while keeping the overall device complexity manageable.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent incorporates preliminary alignment features, pre-formed spacers, and pre-assembled subunits that ensure uniform gaps are established during the assembly process. This preliminary preparation prevents gap non-uniformity without requiring complex real-time adjustment mechanisms.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If polymer waveguide layers are used, then ease of manufacture is improved, but direct contact between adjacent layers occurs causing light leakage and image quality deterioration

Engineering Contradiction:

Improveease of manufactureVSAvoidlight leakage prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces intermediary spacers and support structures between adjacent polymer waveguide layers to maintain precise separation. These intermediaries prevent direct contact and light leakage while allowing the polymer-based construction to retain its manufacturing simplicity.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution minimizes bending and warping, maintaining uniform gaps and enhancing image quality by ensuring consistent expansion and contraction of polymer layers, thereby improving optical performance.

Implementation Method 1

An adhesive is between the first cover layer and the first optical waveguide, the second cover layer and the second optical waveguide, and adjacent pairs of optical waveguides

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

apply hydrophobic or omniphobic coatings

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Implementation Method 3

a coefficient of thermal expansion of the polymer material and the adhesive is substantially the same

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS12572006B2Polymer eyepiece assemblies for augmented and mixed reality systems

Publication Date: 2026.03.10 MAGIC LEAP INC

AI summary

Fabrication of augmented reality (AR) and mixed reality (MR) polymer eyepiece assemblies and the resulting AR/MR polymer eyepiece assemblies may include one or more features, separately or in any appropriate combination, to compensate for expected deformation and to maintain substantially uniform gaps between polymer layers. Such features include fabricating polymer eyepiece assemblies with components having coefficients of thermal expansion (CTE) that are substantially the same; modifying the surface chemistry or structure of one or more polymer layers to increase hydrophobicity or omniphobicity of the polymer layer; disposing adhesive between adjacent polymer layers in continuous and/or extended configurations; and disposing microspheres of different sizes at selected locations between polymer layers.