Pixel Definition Layer Separator With Undercut OLED Display Fabrication
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Solution Overview
Problem
Current light emitting display devices require additional processes to form a separator on the pixel definition layer, which increases complexity and cost.
Innovation Solution
A light emitting display device and manufacturing method that form a separator on the pixel definition layer without additional processes, using an auxiliary insulating layer and over-etching to create an under-cut structure, allowing the separator to be integrated directly into the pixel definition layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional processes are used to form a separator on the pixel definition layer, then the separator can be formed, but the manufacturing complexity and cost increase
Solution Approach 1:
The separator formation process is merged with the pixel definition layer formation process. The pixel definition layer is formed with integrated separators by defining the pixel electrode pattern and separator pattern simultaneously in the same insulating layer, eliminating the need for separate separator formation processes and reducing manufacturing complexity.
Solution Approach 2:
The pixel definition layer serves multiple functions: it defines the pixel electrode boundaries and simultaneously forms the separators that divide the pixel electrodes. This multi-functional design allows a single layer to perform both pixel definition and separation functions, reducing the total number of manufacturing steps.
2Reliability
If additional processes are used to form a separator on the pixel definition layer, then the separator can be formed, but the manufacturing cost increases
Solution Approach 1:
The separator formation process is merged with the pixel definition layer formation process. The pixel definition layer is formed with integrated separators by defining the pixel electrode pattern and separator pattern simultaneously in the same insulating layer, eliminating the need for separate separator formation processes and reducing manufacturing complexity.
Solution Approach 2:
The pixel definition layer serves multiple functions: it defines the pixel electrode boundaries and simultaneously forms the separators that divide the pixel electrodes. This multi-functional design allows a single layer to perform both pixel definition and separation functions, reducing the total number of manufacturing steps.
3Reliability
If the separator is formed separately from the pixel definition layer, then the separator can be formed, but the integration with the pixel definition layer is reduced
Solution Approach 1:
The separator formation process is merged with the pixel definition layer formation process. The pixel definition layer is formed with integrated separators by defining the pixel electrode pattern and separator pattern simultaneously in the same insulating layer, eliminating the need for separate separator formation processes and reducing manufacturing complexity.
Data Source
AI summary
A light emitting display device includes: a first light emitting electrode; a pixel definition layer including a light-emitting element opening exposing a part of the first light emitting electrode and including a separator; an emission layer in the light-emitting element opening; a second light emitting electrode divided by a separator; and an auxiliary insulating layer between the first light emitting electrode and the pixel definition layer and in contact with the first light emitting electrode and the pixel definition layer, wherein the separator is formed of an opening in the pixel definition layer, and an under-cut is formed under the opening in the separator.