Display Device Signal-Line Structure for Moisture Corrosion Resistance
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Solution Overview
Problem
Existing display devices face issues with reliability due to moisture penetration, which can cause corrosion in signal lines, affecting the overall performance and longevity of the display device.
Innovation Solution
The display device incorporates a signal line structure with a first line portion, a connection portion, and a second line portion on a different layer, where the connection portion is covered by an organic layer with specific openings that prevent moisture penetration, enhancing the reliability of the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are exposed without coverage, then manufacturing process is simpler, but moisture penetration causes corrosion and reduces reliability
Solution Approach 1:
An organic layer is introduced as an intermediary protective element between the signal line and the environment. This organic layer acts as a moisture barrier while allowing the signal line to maintain its electrical function, thus protecting against corrosion without requiring complete structural redesign
Solution Approach 2:
The signal line structure employs a nested configuration where the first line portion and second line portion are positioned at different layers, with the connection portion linking them. This multi-layer nesting provides inherent protection while maintaining electrical connectivity
2Reliability
If contact holes are left open without coverage, then manufacturing is easier, but moisture ingress through contact holes corrodes underlying structures
Solution Approach 1:
The organic layer serves as a mediator that covers the contact holes, preventing moisture from reaching the underlying metal structures. This intermediary layer is applied through standard semiconductor manufacturing processes, balancing protection with manufacturability
Solution Approach 2:
A thin organic film is used to cover the contact holes, providing effective moisture protection while maintaining compatibility with existing manufacturing processes. The thin film nature allows for easy integration without significant process changes
Data Source
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AI summary
A display device includes: a base substrate including a first area, a second area spaced apart from the first area in a first direction, and a third area between the first area and the second area; a pixel in the first area; and a signal line in the first, second, and third areas, the signal line including: a first line portion in the first area; an insulating layer on the first line portion and having a plurality of contact holes defined therethrough; a connection portion on the insulating layer and connected to the first line portion via the contact holes; and a second line portion extending from the first area to the third area and on a different layer from the first line portion, wherein the contact holes are covered by the second line portion and overlap the second line portion in a plan view.