Optical Laminate Structure for Higher Light Extraction and Durability
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Solution Overview
Problem
Existing technologies provide insufficient light extraction functions for products designed to glow or display specific designs, necessitating an improvement in light extraction efficiency.
Innovation Solution
An optical laminate comprising a light extraction layer with recessed portions, covered by cover sheets via pressure-sensitive adhesive layers, and incorporating a region with a refractive index lower than the adhesive layers, which can be an air portion or a porous layer, to enhance light extraction and maintain durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light extraction layer with recessed portions is used to improve light extraction, then light extraction function is enhanced, but the structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The patent employs a porous layer with refractive index lower than the pressure-sensitive adhesive layer to enhance light extraction. The porous structure creates refractive index differences that promote light scattering and extraction without requiring complex recessed portion geometries, thus improving light extraction while maintaining manufacturing feasibility.
Solution Approach 2:
The patent changes the refractive index parameter by introducing a porous layer with specifically controlled porosity (5-50%) and refractive index (1.10-1.30). This parameter modification enables effective light extraction through refractive index mismatch without altering the basic laminated structure, avoiding the need for complex geometric modifications.
2Use of energy by moving object
If the refractive index of the adhesive layer is reduced to improve light extraction, then light utilization efficiency is improved, but adhesive strength and durability may be compromised
Solution Approach 1:
The patent introduces a porous layer as an intermediary between the light extraction layer and the pressure-sensitive adhesive layer. This porous layer serves as a mediator that provides the necessary refractive index difference for improved light extraction while the pressure-sensitive adhesive layer maintains its original composition and adhesive properties, thus decoupling the optical and adhesive functions.
Solution Approach 2:
The patent creates a composite structure consisting of the pressure-sensitive adhesive layer and the porous layer. The composite material combines the adhesive properties of the pressure-sensitive adhesive with the optical properties of the porous material, achieving both strong bonding and enhanced light extraction without compromising either function.
3Illumination intensity
If a porous layer is introduced to enhance light extraction, then light extraction performance is improved, but the number of layers increases and manufacturing complexity rises
Solution Approach 1:
The porous layer serves multiple functions simultaneously: it provides refractive index difference for light extraction enhancement, acts as a bonding interface between layers, and maintains structural integrity. This multi-functionality reduces the need for additional specialized layers, effectively managing complexity while achieving improved light extraction.
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 optical laminate achieves excellent light extraction performance with improved light utilization efficiency and durability, allowing controlled luminous intensity distribution and efficient light propagation.
Implementation Method 1
The optical laminate has a region (40) having a refractive index lower than a refractive index of the first pressure-sensitive adhesive layer (21) or the second pressure-sensitive adhesive layer (22) arranged on any one of a first main surface side or a second main surface side of the light extraction layer (10)
Data Source
AI summary
An optical laminate includes: a light extraction layer having a first main surface and a second main surface, and having a light extraction mechanism including a recessed portion arranged on any one of the first main surface or the second main surface; a first cover sheet laminated via a first pressure-sensitive adhesive layer on a main surface side of the light extraction layer on which the light extraction mechanism is arranged; and a second cover sheet laminated via a second pressure-sensitive adhesive layer on a main surface side of the light extraction layer on which the light extraction mechanism is prevented from being arranged. The optical laminate has a region having a refractive index lower than a refractive index of the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer arranged on any one of a first or a second main surface side of the light extraction layer.