Optical Adhesive Layer Refractive Index Optimization for Foldable Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high light output efficiency while maintaining excellent optical and foldable characteristics.
Innovation Solution
A display device configuration that includes a display layer with a light emitting element and a sensor layer, both of which are integrated with an optical adhesive layer made from a material comprising an aliphatic monomer, an aromatic monomer, an organic additive, and an inorganic particle, optimizing refractive indices and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional adhesive layer is used, then the device structure is simple, but the light output efficiency is insufficient
Solution Approach 1:
The optical adhesive layer uses a composite material system comprising a resin component (acrylic or epoxy resin) and a silane-modified polymer component. This composite structure enables simultaneous achievement of high light output efficiency through optimized refractive index (1.56-1.7) and improved mechanical flexibility for foldable devices, resolving the contradiction between optical performance and structural simplicity.
Solution Approach 2:
The patent optimizes the refractive index parameter of the optical adhesive layer to a specific range (1.56-1.7) and controls the thickness parameter (1-10 μm) to achieve optimal light extraction efficiency. By carefully adjusting these physical parameters, the system improves light output efficiency without significantly increasing structural complexity.
2Productivity
If the optical adhesive layer has high refractive index to improve light efficiency, then light output efficiency improves, but the material becomes less flexible for foldable devices
Solution Approach 1:
The optical adhesive layer uses a composite material system comprising a resin component (acrylic or epoxy resin) and a silane-modified polymer component. This composite structure enables simultaneous achievement of high light output efficiency through optimized refractive index (1.56-1.7) and improved mechanical flexibility for foldable devices, resolving the contradiction between optical performance and structural simplicity.
Solution Approach 2:
The patent employs a thin film structure with controlled thickness (1-10 μm) that maintains flexibility while providing optimal optical performance. The silane-modified polymer component specifically contributes to mechanical flexibility, allowing the thin adhesive layer to accommodate bending and folding without compromising the high refractive index required for light efficiency.
3Adaptability or versatility
If the optical adhesive layer is made thinner to improve flexibility, then foldable characteristics improve, but the optical performance deteriorates
Solution Approach 1:
The patent optimizes the thickness parameter of the optical adhesive layer to a specific range (1-10 μm) to achieve optimal light extraction efficiency. By carefully adjusting this physical parameter, the system improves light output efficiency without significantly increasing structural complexity.
Solution Approach 2:
The optical adhesive layer uses a composite material system comprising a resin component (acrylic or epoxy resin) and a silane-modified polymer component. This composite structure enables simultaneous achievement of high light output efficiency through optimized refractive index (1.56-1.7) and improved mechanical flexibility for foldable devices, resolving the contradiction between optical performance and structural simplicity.
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 proposed solution enhances light output efficiency, supports foldable device characteristics, and ensures excellent optical performance by optimizing the refractive indices and mechanical properties of the optical adhesive layer.
Implementation Method 1
The optical adhesive layer may have a second refractive index greater than the first refractive index. A refractive index of the optical adhesive layer may be in a range of about 1.56 to about 1.7.
Data Source
AI summary
A display device includes a display layer including a light emitting element including a first electrode, a second electrode, and a light emitting layer electrically connected to the first electrode and the second electrode, and a sensor layer disposed on the display layer and including a conductive pattern layer, a passivation layer disposed on the conductive pattern layer and including an opening, and an optical adhesive layer disposed on the passivation layer, forming an interface with the passivation layer, and including an optical adhesive material. The passivation layer has a first refractive index. The optical adhesive layer has a second refractive index greater than the first refractive index. The optical adhesive material includes an aliphatic monomer, an aromatic monomer, an organic additive, and an inorganic particle.