Tiled Display Side Surface Overcoat for Line Delamination Resistance
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Solution Overview
Problem
Display devices face challenges in preventing damage to side surface lines, which can lead to driving failures due to external impacts, as existing technologies do not effectively address the delamination of these lines.
Innovation Solution
A display device design featuring an overcoat layer with varying thicknesses, where the region not overlapping the side surface line has a greater thickness than the region overlapping it, and the overcoat layer contacts the side surface and top surfaces of the side surface lines, reducing the likelihood of delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform thickness overcoat layer is used, then the manufacturing process is simple, but the side surface line is vulnerable to delamination from external impacts
Solution Approach 1:
The overcoat layer is designed with non-uniform thickness, where the first region (overlapping the side surface line) has a first thickness and the second region (not overlapping the side surface line) has a second thickness greater than the first thickness. This local variation in thickness provides enhanced protection to the side surface line against delamination from external impacts while maintaining manufacturing feasibility through a single-layer structure.
2Object-affected harmful factors
If the overcoat layer is made thicker to protect against impacts, then the protection effectiveness increases, but the level difference and structural complexity increase
Solution Approach 1:
The overcoat layer implements local quality by having different thicknesses in different regions. The second region has a greater thickness to provide enhanced impact protection, while the first region maintains a smaller thickness to minimize level difference. This selective thickness distribution optimizes both protection effectiveness and surface flatness.
Solution Approach 2:
The design converts the potential harm of a thick overcoat layer (which would create large level differences) into a benefit by strategically placing the increased thickness only in the second region where it is most needed for impact protection, while keeping the first region thinner to maintain surface flatness. This transforms the trade-off into a mutually beneficial solution.
Data Source
AI summary
A display device includes: a substrate; a light-emitting element on a first surface of the substrate; a driver on a second surface of the substrate opposite to the first surface, and configured to drive the light-emitting element; a first pad on the first surface of the substrate, and electrically connected to the light-emitting element; a second pad on the second surface of the substrate, and electrically connected to the driver; side surface lines on a side surface of the substrate that is between the first surface and the second surface of the substrate, the side surface lines to electrically connect the first pad to the second pad; and an overcoat layer on the side surface of the substrate, and on the side surface lines, a thickness of a region not overlapping a side surface line is greater than a thickness of a region overlapping the side surface line.