Inverted OLED Panel with Silver Electrodes and Segmented Hole Transport
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Solution Overview
Problem
Existing organic light-emitting display panels face challenges in achieving balanced hole and electron injection, leading to high bias voltage requirements, low light-emitting efficiency, and short lifetimes, particularly in inverted structures.
Innovation Solution
The use of silver or silver-containing metallic materials for electrodes and a conductive material doped with a P-type semiconductor in the hole transport layer, along with a P-type semiconductor material layer, facilitates improved charge balance and hole injection, reducing the required bias voltage and enhancing light-emitting efficiency and panel longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inverted organic light-emitting display panel structure is used, then the cathode is protected from erosion by water and oxygen, but it becomes very hard to achieve balanced adjustment of hole injection and electron injection, requiring very high bias voltage and resulting in much lower light-emitting efficiency
Solution Approach 1:
The patent divides the hole transport layer into multiple functional segments: a first hole transport layer adjacent to the light-emitting layer and a second hole transport layer adjacent to the anode. This segmentation allows independent optimization of charge transport properties in different regions, enabling balanced hole injection while maintaining the inverted structure's protection benefits.
Solution Approach 2:
The patent introduces an electron injection layer as an intermediary between the cathode and the light-emitting layer. This intermediary layer facilitates balanced charge injection by mediating electron transport, allowing the inverted structure to achieve proper charge balance without requiring excessively high bias voltage.
2Power
If an upright organic light-emitting display panel structure is used, then charge balance can be adjusted well, but the active metal in the cathode tends to be eroded by water and oxygen, causing a very short lifetime
Solution Approach 1:
The patent adopts an inverted display panel structure where the cathode is positioned adjacent to the substrate rather than being exposed to the environment. This inversion protects the active metal in the cathode from water and oxygen erosion, thereby extending display panel lifetime while maintaining charge balance adjustment capabilities through the multi-layer hole transport structure.
3Reliability
If an inverted organic light-emitting display panel is used, then the cathode is protected from erosion, but the light-emitting efficiency is much lower than that of the upright structure
Solution Approach 1:
By segmenting the hole transport function into first and second hole transport layers, the patent optimizes hole injection and transport efficiency in the inverted structure. This allows the device to achieve high light-emitting efficiency comparable to upright structures while maintaining cathode protection benefits.
Solution Approach 2:
The electron injection layer acts as a mediator that enhances electron transport efficiency in the inverted structure. This intermediary layer ensures efficient charge balance and high light-emitting efficiency while the inverted configuration maintains cathode protection from environmental degradation.
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
This configuration allows for adjusted charge balance, lowering the bias voltage needed for organic light-emitting display panels, thereby improving efficiency and extending their lifespan.
Implementation Method 1
the material of the first hole transport layer is a conductive material doped with a P-type semiconductor material
Implementation Method 2
a P-type semiconductor material layer is set between the first hole transport layer and the first electrode
Data Source
AI summary
Disclosed are an organic light-emitting display panel and an organic light-emitting display device. The organic light-emitting display panel comprises: a substrate, a second electrode, a light-emitting layer, a first hole transport layer and a first electrode that are successively laminated, wherein, the materials of both the first electrode and the second electrode are silver or silver-containing metallic materials, the material of the first hole transport layer is a conductive material doped with a P-type semiconductor material or a P-type semiconductor material layer is set between the first hole transport layer and the first electrode.