Universal Mask Plate for OLED Emission Layer Fabrication
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Solution Overview
Problem
The fabrication process of organic electroluminescent devices is complex and costly due to the need for elaborate mask plates to create red, green, and blue pixel emission layers, which increases equipment expenditure and technological complexity.
Innovation Solution
A method involving a universal mask plate to fabricate a blue pixel emission layer with both effective and non-effective emission areas, where the red and green pixel emission layers are fabricated on the non-effective emission area, reducing equipment costs and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If elaborate mask plates are used to fabricate red, green, and blue pixel emission layers separately, then manufacturing precision is improved, but device complexity and equipment expenditure increase
Solution Approach 1:
The patent applies universality by using a single mask plate for fabricating multiple emission layers (red, green, and blue pixels) instead of requiring separate elaborate mask plates for each layer. This universal mask plate approach simplifies the fabrication process while maintaining manufacturing precision through the designed pattern structure that enables selective emission layer formation across different pixel types.
2Manufacturing precision
If elaborate mask plates are used to fabricate red, green, and blue pixel emission layers separately, then manufacturing precision is improved, but equipment expenditure increases
Solution Approach 1:
The patent reduces equipment expenditure by designing a universal mask plate that serves multiple functions in fabricating red, green, and blue pixel emission layers. This eliminates the need to purchase and maintain multiple separate elaborate mask plates, thereby reducing equipment costs while still achieving the required manufacturing precision through the mask's pattern design.
Solution Approach 2:
The patent merges the fabrication process for multiple emission layers into a single step using one mask plate. By combining the patterns for red, green, and blue pixels into a single mask design, the patent reduces equipment expenditure associated with multiple mask plates while maintaining manufacturing precision through the integrated pattern structure.
3Manufacturing precision
If separate mask plates are used for each emission layer, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent improves ease of manufacture by introducing a universal mask plate that can be used for fabricating all emission layers (red, green, and blue pixels) in a single process step. This eliminates the need to handle, align, and process multiple separate mask plates, thereby simplifying the fabrication process while maintaining manufacturing precision through the mask's designed pattern.
Solution Approach 2:
The patent merges multiple fabrication steps into one by using a single mask plate that contains patterns for all emission layers. This consolidation reduces the number of processing steps, simplifies the fabrication process, and improves ease of manufacture while maintaining manufacturing precision through the integrated mask design.
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 reduces equipment expenditure and technological complexity while maintaining normal device operation by using a universal mask plate for the blue pixel emission layer, allowing the red and green layers to be fabricated more efficiently on the same layer, thereby simplifying the OLED device fabrication process.
Implementation Method 1
material for the blue pixel emission layer comprising body material and a doping; the body material configured to transport holes; the doping comprising a chemical compound with a blue emission radical group
Data Source
AI summary
A fabrication method of an organic electroluminescent device includes: providing a substrate configured to an anode of the device; fabricating a blue pixel emission layer on one side of the substrate with a universal mask plate; and fabricating a red pixel emission layer and a green emission layer successively on one side of the blue pixel emission layer which backs toward the substrate. The blue pixel emission layer includes an effective emission area and a non-effective emission area. The red pixel emission layer and the green pixel emission layer both are the same layer and arranged on the non-effective emission area. The present disclosure can reduce equipment expenditure in fabricating the emission layers and the complexities of technology.