OLED Display Intermediate Layer Dipole Material Resistance
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Solution Overview
Problem
Existing OLED displays face issues with high driving voltage, low luminance, and short service life due to high interfacial resistance and non-uniform surface formation.
Innovation Solution
Incorporating a dipole material made of Group I, Group II, or transition metals with halogens in the intermediate layers to reduce interfacial resistance and enhance surface uniformity, thereby increasing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electrode structures are used in OLED displays, then the device structure is simple, but the interfacial resistance is high and luminous efficiency is low
Solution Approach 1:
The patent introduces an intermediate layer comprising a dipole material between the electrode and the emission layer. This intermediate layer acts as a mediator that reduces interfacial resistance and improves charge injection efficiency, thereby increasing luminous efficiency without significantly complicating the manufacturing process. The dipole material with specific electron affinity values (2.0-3.5 eV) facilitates better electrical contact between the electrode and organic emission layer.
2Ease of manufacture
If conventional electrode structures are used in OLED displays, then the device structure is simple, but the surface uniformity is poor
Solution Approach 1:
The intermediate layer with dipole material serves as a buffer that improves surface uniformity. The layer with controlled thickness (50-200 nm) and specific material properties creates a more uniform interface for the emission layer, ensuring consistent charge distribution and improving manufacturing precision without requiring complex processing steps.
3Illumination intensity
If higher driving voltage is applied to conventional OLED displays, then luminance can be increased, but the service life decreases
Solution Approach 1:
The patent changes the electrical parameters at the electrode interface by introducing the dipole material layer with specific electron affinity values. This parameter change reduces the energy barrier for charge injection, allowing efficient luminance generation at lower driving voltages, thereby extending the service life of the OLED display while maintaining or improving luminance output.
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 effectively reduces interfacial resistance and improves surface uniformity, leading to increased luminous efficiency and extended service life of OLED displays.
Implementation Method 1
the first intermediate layer comprises a dipole material that is made of a first material comprising at least one element from Group I, Group II, lanthanide, or transition metals, and a second material comprising a halogen
Implementation Method 2
electrons injected from one electrode and holes injected from the other electrode are combined in the organic emission layer to generate excitons, and the generated excitons release energy to emit light
Data Source
AI summary
An organic light emitting diode (OLED) display includes: a thin film transistor on the substrate; a first electrode electrically connected to the thin film transistor; a hole injection layer on the first electrode; an emission layer on the hole injection layer; an electron injection layer on the emission layer; a first intermediate layer on the electron injection layer; and a second electrode on the first intermediate layer.