Curved Light-Emitting Substrate Structure for Breakage Resistance
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Solution Overview
Problem
Existing light-emitting devices and display devices face challenges in being thin, lightweight, and less prone to breakage while maintaining high light extraction efficiency and low power consumption, especially for mobile applications.
Innovation Solution
A light-emitting device structure featuring a substrate with a higher refractive index than air, bent to overlap with the element layer, and a bonding layer with a scattering member to enhance light extraction and durability, using organic resins for the substrate to reduce weight and include a touch sensor for functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass substrate is used for the light-emitting device, then the device has high strength and reliability, but the device becomes heavy and more prone to breakage
Solution Approach 1:
The patent changes the material parameter of the substrate from glass to flexible resin material, which fundamentally alters the weight and flexibility characteristics while maintaining the substrate's protective and structural functions
Solution Approach 2:
The patent employs composite material structures including flexible substrates combined with resin layers and functional coatings, creating a multi-layer composite that achieves both flexibility and required mechanical strength without using heavy glass
2Weight of moving object
If the substrate is made thin and flexible, then the device becomes lightweight and less prone to breakage, but the light extraction efficiency decreases
Solution Approach 1:
The patent introduces curved or bent regions in the flexible substrate to create optical path modifications that enhance light extraction efficiency while maintaining the thin and flexible form factor of the device
Solution Approach 2:
The patent applies different structural characteristics to different regions of the substrate, with curved regions designed for enhanced light extraction and flat regions maintaining structural integrity, creating localized functional optimization
3Loss of energy
If the substrate is bent to overlap with the element layer, then the light extraction efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The flexible substrate serves multiple functions simultaneously: it provides structural support, enables light extraction enhancement through curvature, and allows for thin and flexible device form factor, eliminating the need for separate components
4Weight of moving object
If organic resin is used for the substrate, then the device becomes lightweight and flexible, but the heat resistance and chemical resistance decrease
Solution Approach 1:
The patent uses composite material structures where organic resin substrates are combined with heat-resistant coating layers and protective films, creating a multi-layer system that provides both flexibility and thermal stability
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, reliable, and high-efficiency light-emitting device that is less likely to break, with improved light extraction and reduced power consumption, suitable for mobile and flexible applications.
Implementation Method 1
a bonding layer with a scattering member to enhance light extraction
Implementation Method 2
The substrate has a light-transmitting property and a refractive index that is higher than that of the air
Implementation Method 3
The element layer includes a light-emitting element that emits light toward the substrate side
Data Source
AI summary
A light-emitting device or a display device that is less likely to be broken is provided. Provided is a light-emitting device including an element layer and a substrate over the element layer. At least a part of the substrate is bent to the element layer side. The substrate has a light-transmitting property and a refractive index that is higher than that of the air. The element layer includes a light-emitting element that emits light toward the substrate side. Alternatively, provided is a light-emitting device including an element layer and a substrate covering a top surface and at least one side surface of the element layer. The substrate has a light-transmitting property and a refractive index that is higher than that of the air. The element layer includes a light-emitting element that emits light toward the substrate side.