OLED Intervening Layer Structure for Simpler Electron Injection
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Solution Overview
Problem
The existing deposition process for fabricating large-size OLED display devices is limited by the size of the deposition chamber and the need for additional space for substrate input/output, which restricts the production of large-size displays.
Innovation Solution
The introduction of a solution process for forming the organic emitting diode, specifically using an intervening layer with a base material and an electron injection material between the emitting material layer and the second electrode, which contacts the second electrode, allowing for a simpler and more cost-effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deposition process is used to fabricate OLED display devices, then the emitting efficiency can be improved, but the device complexity and manufacturing cost increase due to the need for separate electron transporting layer and electron injection layer
Solution Approach 1:
The patent combines the electron transporting layer and electron injection layer into a single integrated layer. This layer contains both electron transporting materials and electron injection materials, eliminating the need for separate layers while maintaining the electron injection and transport functions. The merged layer structure reduces device complexity and manufacturing steps while preserving emitting efficiency.
Solution Approach 2:
The single layer is designed to perform multiple functions simultaneously: it serves as both the electron transporting layer and the electron injection layer. By incorporating both electron transporting materials and electron injection materials in the same layer, the structure achieves multi-functionality, reducing the overall number of layers needed in the OLED device.
2Reliability
If a deposition process is used for fabricating large-size OLED display devices, then the emitting efficiency is maintained, but the productivity decreases due to the limitation of deposition chamber size and additional space requirements for substrate input/output
Solution Approach 1:
By merging the electron transporting layer and electron injection layer into one layer, the patent reduces the number of deposition steps required. This consolidation allows for more efficient use of deposition chamber space and time, improving productivity for large-size OLED display devices while maintaining the necessary electron injection and transport functions.
3Reliability
If separate electron transporting layer and electron injection layer are used, then the electron injection and transport can be optimized, but the manufacturing cost increases
Solution Approach 1:
The patent merges the electron transporting layer and electron injection layer into a single layer, reducing the number of materials and manufacturing steps required. This consolidation lowers material costs and processing costs while maintaining effective electron injection and transport through the combined functionality of electron transporting materials and electron injection materials in the same layer.
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 approach enhances the emitting efficiency and lifetime of the OLED display device by improving electron injection and transport without the need for electron transporting and injection layers, resulting in a simpler structure and reduced production costs.
Implementation Method 1
an intervening layer between the emitting material layer and the second electrode and including a base material and an electron injection material, wherein the intervening layer contacts the second electrode
Data Source
AI summary
The present invention provides an organic emitting diode including a first electrode; a second electrode facing the first electrode; an emitting material layer between the first and second electrodes; and an intervening layer between the emitting material layer and the second electrode and including a base material and an electron injection material, wherein the intervening layer contacts the second electrode.