Peripheral Insulating Structure for Ashing-Resistant Display Panels
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Solution Overview
Problem
Display devices suffer from reliability defects due to structural damage during manufacturing processes, particularly from ashing processes that affect insulating layers, leading to potential moisture penetration and damage to scan drivers.
Innovation Solution
The display device incorporates a conductive pattern between insulating patterns in the peripheral area, supported by a dam structure, which protects the insulating layers from ashing damage and minimizes moisture penetration, enhancing structural integrity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ashing process is applied to remove organic insulating layers, then manufacturing progress is achieved, but structural damage occurs to insulating layers and scan drivers
Solution Approach 1:
The insulating layer structure is segmented into multiple functional layers: a first organic insulating layer, a second organic insulating layer, and an inorganic insulating layer positioned between them. This segmentation allows the inorganic layer to protect the first organic layer during ashing processes while the second organic layer provides additional insulation, thus enabling manufacturing progress without damaging the underlying scan drivers.
Solution Approach 2:
The inorganic insulating layer is deposited beforehand on the first organic insulating layer to serve as a protective cushion during subsequent ashing processes. This prior cushioning prevents the ashing plasma from directly contacting and damaging the first organic insulating layer and the scan drivers beneath it, while still allowing the ashing process to remove the second organic insulating layer when needed.
2Productivity
If insulating layers are removed during manufacturing, then device assembly progresses, but moisture penetration risk increases
Solution Approach 1:
The insulating structure employs a composite material system combining organic insulating materials (first and second organic insulating layers) with inorganic insulating material (inorganic insulating layer). This composite structure provides both the necessary insulation properties and enhanced moisture barrier characteristics, preventing moisture penetration while allowing device assembly to progress through selective removal of the second organic layer.
3Reliability
If multiple insulating layers are added to protect during manufacturing, then reliability improves, but device complexity increases
Solution Approach 1:
The inorganic insulating layer is selectively positioned only in the peripheral region of the substrate, specifically between the first and second organic insulating layers in areas where ashing damage would occur. This localized approach provides targeted protection during manufacturing without adding complexity to the entire device structure, maintaining simplicity in the display area while enhancing reliability in vulnerable peripheral regions.
Data Source
AI summary
A display device, an electronic device including the display device, and a method for manufacturing the display device are disclosed. The display device may include: a substrate including a display area and a peripheral area around at least a portion of the display area, a common voltage supply line provided in the peripheral area and configured to have a common voltage applied to it, a support provided in the peripheral area and including a first insulating pattern, a second insulating pattern on the first insulating pattern, and a conductive pattern between the first insulating pattern and the second insulating pattern, at least one dam provided between the support and the display area in a plan view and around the display area, and a light emitting element including a pixel electrode, a light emitting layer, and a common electrode that are sequentially provided in the display area on the substrate.