OLED Uneven Reflective Layer Microcavity Effect
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Solution Overview
Problem
Existing OLEDs suffer from microcavity effects that lead to issues with viewing angle and display uniformity due to the resonant cavity formed by reflective and semi-reflective layers, which can be exacerbated by high-energy manufacturing processes and thin metal layers.
Innovation Solution
An organic light-emitting diode with an uneven structure on the reflective conductive layer close to the light-emitting side, which disrupts the cavity thickness and scattering effect, reducing or eliminating the microcavity effect, and includes a semi-reflective conductive layer and a transparent conductive layer to enhance light emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective conductive layer with a semi-reflective layer is used to form a resonant cavity in OLED, then light emission can be enhanced, but microcavity effects occur that degrade viewing angle and display uniformity
Solution Approach 1:
The patent introduces an asymmetric micro-structure layer with random distribution of micro-spheres or micro-holes on the reflective conductive layer. This asymmetric structure disrupts the symmetric resonant cavity that causes microcavity effects, thereby eliminating the interference patterns that degrade viewing angle and display uniformity while preserving light emission enhancement.
Solution Approach 2:
The patent modifies the physical parameters of the reflective conductive layer by introducing micro-structures with specific size ranges (5-50 μm for micro-spheres, 3-30 μm for micro-holes) and controlled filling ratios (10-50%). These parameter changes transform the flat reflective surface into a micro-structured surface that scatters light differently, eliminating microcavity effects while maintaining optical enhancement.
2Productivity
If high-energy manufacturing processes are used in OLED production, then manufacturing efficiency can be improved, but the microcavity effect is exacerbated
Solution Approach 1:
The patent applies the micro-structure layer during the manufacturing process itself, forming it as part of the reflective conductive layer structure before final OLED assembly. This preliminary action ensures that the microcavity effect is prevented from the outset rather than requiring post-manufacturing corrections, maintaining both manufacturing efficiency and display quality.
3Weight of moving object
If thin metal layers are used in OLED structure, then device flexibility and lightweight are improved, but the microcavity effect becomes more pronounced
Solution Approach 1:
The patent introduces asymmetric micro-structures on the thin metal reflective layer that disrupt the symmetric resonant cavity formation. This allows the use of thin metal layers for lightweight and flexibility while the micro-structures prevent the microcavity effect from becoming pronounced, as the scattered light paths break the resonant conditions.
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 improves light emission uniformity and viewing angle by weakening or eliminating the microcavity effect, ensuring better display performance without compromising light-emitting efficiency.
Implementation Method 1
the surface of the reflective conductive layer close to the second electrode has an uneven structure... disrupting the cavity thickness and scattering effect, reducing or eliminating the microcavity effect
Data Source
AI summary
The present disclosure provides an organic light-emitting diode and a method for manufacturing the same, a display substrate and a method for manufacturing the same, and a display device. The organic light-emitting diode comprises a first electrode, a second electrode, and an organic light-emitting layer arranged between the first electrode and the second electrode, in which the second electrode is arranged close to the light-emitting side of the organic light-emitting diode, the first electrode includes a reflective conductive layer, and a surface of the reflective conductive layer close to the second electrode has an uneven structure.