Laminate Structure for Flexible OLED Light Durability
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Solution Overview
Problem
Existing polarizing elements for OLEDs, particularly in flexible displays like smartphones, face challenges with light durability and internal reflection, which affect display performance when using high concentrations of dichroic azo coloring agents.
Innovation Solution
A laminate structure comprising an optically anisotropic layer, a light-absorbing anisotropic layer with a dichroic azo coloring agent compound, a refractive index-adjusting layer, and an oxygen shielding layer, optimized with specific composition and alignment to enhance light durability and reduce internal reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of dichroic azo coloring agent compound is increased to improve light durability, then light durability is improved, but internal reflection increases and display performance deteriorates
Solution Approach 1:
The patent optimizes the content of dichroic azo coloring agent compound within a specific range (10-30 mass%) rather than simply increasing it indefinitely. This parameter optimization resolves the contradiction by finding the optimal balance point where light durability is sufficiently improved while internal reflection is kept at acceptable levels.
Solution Approach 2:
The patent uses a composite light-absorbing anisotropic layer containing both dichroic azo coloring agent compound and liquid crystalline compound. This composite structure allows the dichroic azo coloring agent to provide light durability while the liquid crystalline compound helps control optical properties and reduce internal reflection, thus resolving the contradiction between light durability and internal reflection.
2Reliability
If the content of dichroic azo coloring agent compound is increased to improve light durability, then light durability is improved, but the degree of alignment decreases
Solution Approach 1:
The patent employs a composite system where liquid crystalline compound serves as a matrix or carrier for the dichroic azo coloring agent compound. The liquid crystalline compound provides a structured environment that maintains high degree of alignment even when dichroic azo coloring agent content is increased to 10-30 mass%, thus resolving the contradiction between light durability and alignment precision.
Solution Approach 2:
The patent specifies optimal content ranges for both dichroic azo coloring agent compound (10-30 mass%) and liquid crystalline compound (70-90 mass%) to achieve the desired balance between light durability and degree of alignment. This dual parameter optimization resolves the contradiction by coordinating the proportions of both components.
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 laminate structure achieves superior display performance and light durability in flexible OLED displays by reducing internal reflection and improving light absorption, addressing the limitations of previous technologies.
Implementation Method 1
a light-absorbing anisotropic layer containing a dichroic azo coloring agent compound
Implementation Method 2
a polarizing element having a high degree of alignment by increasing crystallinity of a dichroic azo coloring agent compound using a specific liquid crystalline compound
Implementation Method 3
a refractive index-adjusting layer having a predetermined in-plane average refractive index
Implementation Method 4
an oxygen shielding layer
Data Source
AI summary
The present invention provides a laminate used in an image display device the laminate including an optically anisotropic layer, a light-absorbing anisotropic layer, a refractive index-adjusting layer, and an oxygen shielding layer in this order, where the light-absorbing anisotropic layer is formed of a composition containing dichroic azo coloring agent and liquid crystalline compounds, where the dichroic azo coloring agent compound is 10% to 30% by mass with respect to a mass of a total solid content of the light-absorbing anisotropic layer, a degree of alignment of the light-absorbing anisotropic layer is 0.92 or higher, the refractive index-adjusting layer is formed of a composition containing a crosslinkable group compound, and has an in-plane average refractive index of 1.55 to 1.70 (550 nm λ), and an angle formed by an in-plane slow axis of the optically anisotropic layer and an absorption axis of the light-absorbing anisotropic layer is 45°±10°.