Resin Light Guide Plate With Barrier Layer for Clear AR Images
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Solution Overview
Problem
Existing light guide plates using resin bases for image display in AR or MR devices suffer from image quality degradation due to surface roughness and moisture-induced hologram deterioration, leading to unclear images and hologram degradation, especially in high temperature and high humidity environments.
Innovation Solution
A light guide plate design with a resin base having an MC value of 0.120 or less, incorporating a barrier layer with a refractive index of 1.48 or more, made of inorganic materials like silicon oxide or diamond-like carbon, and a smooth surface with an arithmetic average roughness of 10 nm or less, to enhance image clarity and prevent hologram deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin base is used instead of glass base, then processability and portability are improved, but surface smoothness deteriorates leading to image quality degradation
Solution Approach 1:
The patent applies preliminary action by performing surface smoothing treatment on the resin base before forming the hologram layer. This pre-treatment ensures that the surface roughness is reduced to 10 nm or less in arithmetic average roughness (Ra) before the hologram material is applied, preventing image quality degradation from the outset while maintaining the manufacturing advantages of resin bases.
Solution Approach 2:
The patent changes the surface roughness parameter of the resin base from typical values (greater than 10 nm Ra) to an optimized value of 10 nm or less Ra. This parameter change is achieved through controlled surface smoothing treatment, transforming the resin base surface into a state suitable for high-quality hologram formation while preserving the benefits of using resin over glass.
2Weight of moving object
If a resin base is used instead of glass base, then light weight and portability are improved, but durability in high temperature and high humidity environments deteriorates due to moisture absorption
Solution Approach 1:
The patent introduces a barrier layer as an intermediary between the resin base and the hologram layer. This barrier layer has low moisture permeability and prevents moisture from penetrating into the hologram material, thereby protecting the hologram from deterioration in high temperature and high humidity environments while allowing the use of lightweight resin bases.
Solution Approach 2:
The patent creates a composite structure combining the resin base with a barrier layer having different material properties (low moisture permeability). This composite construction integrates the lightweight advantage of resin with the moisture resistance of the barrier layer, achieving both light weight and high reliability in challenging environmental conditions.
3Manufacturing precision
If surface smoothness is improved to enhance image quality, then manufacturing complexity increases due to additional surface treatment processes
Solution Approach 1:
The patent merges the surface smoothing treatment with the existing resin base manufacturing process. By integrating the smoothing step into the standard production workflow rather than treating it as a separate complex operation, the patent achieves high surface smoothness (10 nm or less Ra) without significantly increasing manufacturing complexity.
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 ensures clear image display and suppresses hologram deterioration by improving resin base flatness and incorporating a barrier layer, maintaining image quality even in challenging environmental conditions.
Implementation Method 1
incorporating a barrier layer with a refractive index of 1.48 or more
Implementation Method 2
a smooth surface with an arithmetic average roughness of 10 nm or less, to enhance image clarity
Data Source
AI summary
A light guide plate for image display can display clear images even when a resin base is used. The Sight guide plate configured for image display may include a first resin base and a hologram layer. The first resin base may have an MC value of 0.120 or less, obtained by evaluation using shadow contrast, according to expression (1):MC=Lmax-LminLmax+Lmin,(1)wherein Lmax is a maximum value of brightness from a brightness distribution, Lmin is a minimum value of the lightness from the brightness distribution, and MC is an MC value that objectively represents a magnitude of a dip in low brightness portions in the brightness distribution.