OLED Layer Thickness Layout for Stable Emission Zone Positioning
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Solution Overview
Problem
The recombination zone in the emission layer of organic light emitting display devices moves due to temperature changes, leading to reduced light emission and shorter device lifetime.
Innovation Solution
Adjusting the thickness of the emission layer and the organic layer to ensure that the recombination zone remains within the emission layer, even at varying temperatures, by configuring the OLED with a structure where the thickness of the emission layer is equal to or greater than that of each organic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the emission layer thickness is increased to maintain the recombination zone within the emission layer at high temperatures, then the device lifetime and efficiency are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by adjusting the thickness of the emission layer and organic layer to specific ranges (emission layer: 50-200 nm, organic layer: 20-100 nm) to maintain the recombination zone within the emission layer at high temperatures, thereby improving device lifetime and efficiency while managing complexity through controlled dimensional parameters
2Productivity
If the emission layer thickness is increased to prevent recombination zone migration at high temperatures, then the light emission efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise thickness parameters for the emission layer (50-200 nm) and organic layer (20-100 nm) to control recombination zone positioning, thereby improving light emission efficiency while establishing clear manufacturing precision targets for layer deposition processes
Solution Approach 2:
The patent performs preliminary optimization of layer thickness ratios before device fabrication, determining that an emission layer thickness equal to or greater than the organic layer thickness prevents recombination zone migration, thereby guiding manufacturing precision requirements in advance
3Duration of action of stationary object
If the organic layer thickness is decreased to maintain recombination zone stability, then the device lifetime is improved, but the material consumption and layer quality control become more challenging
Solution Approach 1:
The patent optimizes the organic layer thickness to 20-100 nm, which is thinner than or equal to the emission layer thickness, to prevent recombination zone migration and improve device lifetime, while establishing specific deposition parameter ranges to maintain manufacturing feasibility
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 enhances the efficiency and extends the lifetime of the organic light emitting display device at both room temperature and high temperatures, maintaining the emission zone within the emission layer.
Implementation Method 1
an exciton is generated by combining the electron with the hole. The OLEDs are devices based on the principle that light is emitted when the generated exciton is dropped from an excited state to a ground state
Data Source
AI summary
Disclosed are an organic light emitting display device and lighting apparatus for vehicles using the same. The organic light emitting display device includes a first layer including a first organic layer and a first emission layer on a first electrode, a second layer including a second emission layer and a second organic layer on the first layer, a second electrode on the second layer, and a third organic layer between the first layer and the second layer. A thickness of the first emission layer is equal to or greater than a thickness of each of the first organic layer and the second organic layer.