Flexible Light-Emitting Device with Bonding Layers
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Solution Overview
Problem
Existing light-emitting devices and display devices face challenges in achieving a balance between being thin, lightweight, and durable while maintaining high light extraction efficiency, luminance, and low power consumption, particularly in flexible designs that are less prone to breakage and impurity exposure.
Innovation Solution
A light-emitting device structure incorporating flexible substrates with bonding layers and a light-emitting element, where the substrates have similar thermal expansion coefficients and are attached using low-melting-point glass or thermoplastic resins to enhance adhesion and prevent impurity entry, while also optimizing the bonding layers for light transmission and moisture barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If flexible substrates are used to make the device thin and lightweight, then the device becomes more prone to breakage and impurity exposure
Solution Approach 1:
The patent implements a nested structure where multiple protective layers are stacked around the light-emitting element. The element layer is sandwiched between first and second flexible substrates, with bonding layers providing additional protection. This nested arrangement protects the fragile light-emitting element while maintaining overall device flexibility and thinness.
Solution Approach 2:
The patent uses composite material structures combining flexible substrates with bonding layers that have both flexibility and protective properties. The bonding layers are specifically designed to provide mechanical strength and impurity barriers while maintaining the flexible nature of the device, resolving the contradiction between flexibility and durability.
2Reliability
If bonding layers are added to protect the light-emitting element, then adhesion and moisture barrier properties improve, but device complexity increases
Solution Approach 1:
The bonding layers in the patent serve multiple functions simultaneously: they provide mechanical adhesion between substrates, act as moisture and impurity barriers, and maintain the flexibility of the device. This multi-functionality reduces the need for additional separate protective components, thereby limiting the increase in device complexity.
3Weight of moving object
If the substrates are made thinner to reduce weight, then the device becomes lightweight, but the substrates become more fragile
Solution Approach 1:
The patent merges multiple thin layers (first flexible substrate, bonding layers, element layer, second flexible substrate) to create a composite structure. Individually, each layer is thin and lightweight, but collectively they provide both weight reduction and enhanced mechanical strength through the combined structure, preventing the substrates from being overly fragile.
4Reliability
If protective layers are added to prevent impurity entry, then reliability improves, but light extraction efficiency may decrease
Solution Approach 1:
The patent uses thin film bonding layers that provide impurity protection while maintaining high light transmission. These thin films are specifically designed to be transparent to the wavelengths of light emitted by the light-emitting element, ensuring that the protective function does not significantly degrade light extraction efficiency.
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 results in a lightweight, flexible, and reliable light-emitting device with high light extraction efficiency and luminance, reduced power consumption, and improved durability, minimizing the risk of breakage and impurity-induced reliability issues.
Implementation Method 1
The first bonding layer is provided between the first flexible substrate and the element layer. The second bonding layer is provided between the second flexible substrate and the element layer.
Implementation Method 2
attached using low-melting-point glass or thermoplastic resins
Implementation Method 3
attached using low-melting-point glass or thermoplastic resins to enhance adhesion
Implementation Method 4
optimizing the bonding layers for light transmission and moisture barrier properties
Implementation Method 5
utilizing electroluminescence (hereinafter also referred to as EL)
Data Source
AI summary
A lightweight flexible light-emitting device that is less likely to be broken is provided. The light-emitting device includes a first flexible substrate, a second flexible substrate, an element layer, a first bonding layer, and a second bonding layer. The element layer includes a light-emitting element. The element layer is provided between the first flexible substrate and the second flexible substrate. The first bonding layer is provided between the first flexible substrate and the element layer. The second bonding layer is provided between the second flexible substrate and the element layer. The first and second bonding layers are in contact with each other on the outer side of an end portion of the element layer. The first and second flexible substrates are in contact with each other on the outer side of the end portions of the element layer, the first bonding layer, and the second bonding layer.