OLED Substrate Light Scattering Layer Total Internal Reflection
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Solution Overview
Problem
In OLED display devices, light emitted is often totally reflected and converted into heat due to the total reflection chain phenomenon, significantly reducing light utilization efficiency.
Innovation Solution
A substrate with a light scattering layer having a diffuse reflection surface, such as a concave-convex structure formed by ion beam or electron beam bombardment, or doped with nanoparticles like PMMA, is used to break the total reflection chain by scattering incident light and changing its optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional OLED structure is used, then the device structure is simple, but light utilization efficiency is low due to total reflection
Solution Approach 1:
A light scattering layer is introduced as an intermediary component between the supporting base and the OLED structure. This layer contains light scattering structures that act as mediators to redirect reflected light, breaking the total reflection chain and improving light utilization efficiency without fundamentally redesigning the entire device architecture.
Solution Approach 2:
The optical parameters of the supporting base are modified by forming light scattering structures on its surface. These structures change the reflection characteristics from total internal reflection to diffuse reflection, thereby altering the light extraction efficiency parameter from approximately 35% to 49% or higher.
2Loss of energy
If ion beam or electron beam bombardment is used to form concave-convex structure, then light scattering performance is improved, but manufacturing process complexity increases
Solution Approach 1:
Traditional mechanical or chemical etching methods for creating surface structures are replaced with ion beam or electron beam bombardment. This substitution enables precise control over the concave-convex structure formation, achieving optimal light scattering performance through controlled physical modification of the light scattering layer surface.
3Productivity
If light scattering layer is added to improve light extraction, then light emission efficiency increases, but device structure becomes more complex
Solution Approach 1:
The light scattering layer is designed to serve multiple functions: it acts as a structural support layer, provides light scattering functionality, and serves as a platform for forming the concave-convex surface structure. By combining multiple functions into a single layer, the patent avoids adding separate components that would further increase device complexity.
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 light scattering structure improves light emission efficiency by redirecting light that would otherwise be lost to heat, increasing the light emission rate and utilization efficiency from around 35% to about 49%.
Implementation Method 1
the light scattering layer has a light scattering structure configured to scatter incident light
Implementation Method 2
the light scattering structure comprises a diffuse reflection surface located on a surface of the light scattering layer away from the supporting base
Implementation Method 3
the concave-convex structure is formed by ion beam bombardment or electron beam bombardment
Implementation Method 4
the concave-convex structure is formed by ion beam bombardment or electron beam bombardment
Data Source
AI summary
The embodiments of the present disclosure propose a substrate, a method for manufacturing the same, and a display device comprising the substrate. The substrate comprises a supporting base; and a light scattering layer disposed such that a projected region of the light scattering layer on the supporting base is located in a light transmission formation region of the supporting base, and the light scattering layer has a light scattering structure configured to scatter incident light.