Display Substrate Alignment Line Layout for Moisture Isolation
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Solution Overview
Problem
Existing display devices face challenges in preventing moisture permeation, which can degrade the performance and longevity of light emitting elements.
Innovation Solution
The display device incorporates a first substrate portion with a protrusion area that includes an open portion and physically separated alignment signal lines, connected through contact holes, and a second substrate portion with overlapping conductive layers to prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous alignment signal lines are used in the protrusion area, then electrical connectivity is maintained, but moisture permeation occurs through the signal lines
Solution Approach 1:
The alignment signal line is divided into multiple segments by introducing open portions in the protrusion area. The first alignment signal line is separated into a first segment and a second segment, which are electrically connected through a contact hole rather than forming a continuous path. This segmentation prevents moisture from traveling along the signal line while maintaining electrical functionality.
2Object-affected harmful factors
If the alignment signal line is physically separated into segments, then moisture permeation is prevented, but electrical connectivity must be maintained through alternative means
Solution Approach 1:
The contact hole is formed within the protrusion area, nesting the electrical connection structure inside the existing substrate geometry. The first and second segments of the alignment signal line are positioned on opposite sides of the open portion, with the contact hole providing a nested connection path through the insulating layer, integrating the solution within the existing device structure.
3Reliability
If the protrusion area is completely sealed, then moisture permeation is blocked, but manufacturing complexity increases
Solution Approach 1:
The open portion is intentionally designed into the protrusion area during the manufacturing process, allowing the alignment signal line to be formed in segments from the beginning. This preliminary structural preparation simplifies subsequent manufacturing steps by providing predefined locations for the open portions and contact holes, rather than requiring complex post-processing to create moisture barriers.
Data Source
AI summary
A display device comprises a first substrate portion including a display area and a non-display area positioned near the display area, and including a pad area, and a second substrate portion facing the first substrate portion. The first substrate portion further includes an overlap area overlapping the second substrate portion in a plan view, and a protrusion area that protrudes more than a side of the second substrate portion, a first sub-substrate portion, a first conductive layer including an alignment pad disposed in the pad area on the protrusion area of the first sub-substrate portion, and a second conductive layer including a first alignment signal line electrically connected to the alignment pad on the first conductive layer, the protrusion area includes an open portion, and the first alignment signal line in a plan view is physically separated based on the open portion.