Curved Resin Substrate for Break-Resistant Light Extraction
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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 highly reliable while also being less likely to break and having high light extraction efficiency and low power consumption.
Innovation Solution
A light-emitting device structure is proposed, which includes an element layer with a light-emitting element and a substrate with a higher refractive index than air, where at least a part of the substrate is bent towards the element layer. This structure incorporates a bonding layer with a scattering member to enhance light extraction and reduce reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a glass substrate is used, then the device has high strength and reliability, but the device becomes heavy and more likely to break
Solution Approach 1:
The patent changes the material parameter of the substrate from glass to flexible resin material. This parameter change reduces the weight and improves flexibility while maintaining sufficient mechanical strength through the resin material's inherent properties and the device's overall structural design.
2Length of moving object
If the substrate is made thinner, then the device becomes thinner and lighter, but the device becomes more likely to break
Solution Approach 1:
The patent changes the material parameter from glass to flexible resin, which allows the substrate to be made thinner while maintaining adequate strength. The resin material's flexibility compensates for the reduced thickness, preventing brittleness and breakage.
Solution Approach 2:
The patent introduces a curved surface structure on the substrate. This curvature design enhances the mechanical strength and flexibility of the thin substrate, distributing stress more effectively and reducing the likelihood of breakage while maintaining thin profile.
3Device complexity
If a flat substrate surface is used, then the device structure is simple, but light extraction efficiency is low
Solution Approach 1:
The patent introduces a curved surface structure on the substrate to improve light extraction efficiency. The curvature modifies the optical path of emitted light, reducing total internal reflection and enhancing light extraction without requiring complex multi-layer structures or additional components.
4Loss of energy
If the refractive index of the substrate is increased, then light extraction efficiency is improved, but reflection increases causing stripe patterns
Solution Approach 1:
The patent uses a curved surface structure to manage the effects of high refractive index. The curvature distributes and scatters the reflected light, preventing the formation of concentrated stripe patterns while maintaining the light extraction benefits of the high refractive index material.
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 structure results in a lightweight, highly reliable, and thin light-emitting device that is less likely to break, with improved light extraction efficiency and reduced power consumption, while also preventing stripe patterns and maintaining high display clarity.
Implementation Method 1
The substrate has a light-transmitting property and a refractive index that is higher than that of the air
Implementation Method 2
This structure incorporates a bonding layer with a scattering member to enhance light extraction and reduce reflection
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.