Display Electrode Layout for Outgassing and Reflectivity Uniformity
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Solution Overview
Problem
Display apparatuses with organic insulating layers exhibit a reflectivity difference between the peripheral and display areas due to outgassing, leading to visually noticeable bands and potential degradation of the emission layer.
Innovation Solution
Incorporating conductive patterns in the middle area between the display and peripheral areas, made of the same material as the pixel electrode and conductive layer, with openings to allow outgassing and reduce reflectivity differences, while maintaining structural integrity and preventing damage during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the organic insulating layer is exposed in the middle area to allow outgassing, then gas emission is improved, but reflectivity difference increases causing visible bands
Solution Approach 1:
The patent applies local quality by introducing conductive patterns specifically in the middle area between the display area and peripheral area, where the organic insulating layer is exposed. These patterns have different reflectivity characteristics than the surrounding areas, creating a gradual transition in optical properties that reduces the visible band effect while maintaining the necessary outgassing pathway.
Solution Approach 2:
The conductive patterns serve as an intermediary element between the display area and peripheral area. They mediate the reflectivity transition by providing a intermediate optical property that bridges the gap between the high-reflection display area and the low-reflection peripheral area, thereby reducing the visual contrast of the exposed organic insulating layer.
2Illumination intensity
If conductive patterns are added in the middle area, then reflectivity difference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the conductive patterns with the existing electrode structure by using the same conductive material and forming them in the same manufacturing process step. The conductive patterns are integrated into the electrode layer that already exists in the display apparatus, combining multiple functions (electrical conduction and optical reflection control) into a single structural element.
Solution Approach 2:
The conductive patterns perform multiple functions simultaneously: they provide electrical conduction pathways and serve as reflective elements to control optical properties. This multi-functionality reduces the need for separate components, thereby minimizing the increase in device complexity while achieving reflectivity uniformity.
3Object-generated harmful factors
If the conductive layer includes openings for outgassing, then gas emission is improved, but structural integrity may be compromised
Solution Approach 1:
The conductive layer is segmented by introducing openings that allow gas to pass through. These openings divide the continuous conductive layer into separate regions, but the segmentations are designed with appropriate spacing and sizing to maintain overall structural integrity while providing sufficient pathways for outgassing from the exposed organic insulating layer.
Data Source
AI summary
A display apparatus including a display area, a peripheral area outside the display area, a middle area between the display area and the peripheral area, an organic insulating layer disposed in the display area, the middle area, and the peripheral area, a pixel electrode disposed on the organic insulating layer and in the display area, a conductive layer disposed on the organic insulating layer, in the peripheral area, and including openings, and conductive patterns disposed on the organic insulating layer, disposed in the middle area, and are spaced apart from one another. The pixel electrode, the conductive layer, and the conductive patterns may include a same material.