Organic EL Element Scatter Reflection Surface Brightness Uniformity
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Solution Overview
Problem
Transmission-type organic EL elements face challenges in reducing brightness variations, and existing solutions are complex, necessitating a simpler configuration to achieve uniform illumination.
Innovation Solution
A transmission-type organic EL element with a first transparent electrode, a functional layer including a light-emitting layer, and a second electrode with a grid-like shape and scatter reflection surface that scatters and reflects light emitted from the light-emitting layer, reducing brightness variations by opposing the functional layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a flat reflection layer is used in the organic EL element, then the structure is simple, but brightness variations occur in the emitted light
Solution Approach 1:
The invention applies a convex shape to the reflection layer, causing it to protrude toward the organic layer. This curvature design scatters the reflected light more effectively across different angles, reducing brightness variations in the emitted light while maintaining a relatively simple single-layer structure without requiring additional scatter layers or complex multi-layer configurations.
2Illumination intensity
If a scatter layer is added to the organic EL element, then brightness variations are reduced, but the device complexity increases
Solution Approach 1:
The invention merges the reflection function and light scattering function into a single reflection layer. By giving the reflection layer a convex shape, it simultaneously performs both reflection and scattering of light, eliminating the need for a separate scatter layer and thus reducing device complexity while achieving uniform brightness.
Solution Approach 2:
The reflection layer is designed to perform multiple functions: it reflects light from the organic layer back toward the electrode and simultaneously scatters the light to reduce brightness variations. This multi-functional design simplifies the overall device structure by eliminating the need for dedicated scatter layers.
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 configuration effectively suppresses brightness variations by scattering and reflecting light, providing a simple and efficient solution for uniform illumination in organic EL elements.
Implementation Method 1
a scatter reflection surface which scatters and reflects a light emitted from the light-emitting layer
Implementation Method 2
a scatter reflection surface which scatters and reflects a light emitted from the light-emitting layer
Data Source
AI summary
An organic EL element according to the present disclosure includes a first electrode having a light-transmission property, a functional layer which is located on the first electrode and which includes a light-emitting layer, and a second electrode which is located on the functional layer, the second electrode having an opening which exposes a part of the functional layer, the second electrode including a scatter reflection surface which scatters and reflects a light emitted from the light-emitting layer, the scatter refection surface opposing to the functional layer.