Display Device Flexible Circuit Protection Against Moisture Ingress
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Solution Overview
Problem
Existing display devices face issues with impurity penetration, particularly moisture, at the connection points between flexible printed circuit boards and display panels, which can compromise their functionality.
Innovation Solution
A display device design that includes a protective layer covering the connection area between the flexible circuit board and the display panel, along with a bending protective layer and a spacer, to prevent impurity ingress, combined with a manufacturing method that forms this protective structure using a resin application and laser removal of base substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is added to cover the connection area between the flexible circuit board and display panel, then impurity penetration is reduced, but device complexity increases
Solution Approach 1:
A protective layer in the form of a thin film is applied over the connection area between the flexible circuit board and display panel. This thin film structure provides effective protection against impurity penetration while adding minimal complexity to the overall device structure.
Solution Approach 2:
The protective layer is integrated within the existing multi-layer structure of the display device, nesting the protective function within the current structural framework rather than adding a completely separate external layer, thereby minimizing additional complexity.
2Adaptability or versatility
If the display panel is made bendable in the bending area, then adaptability is improved, but the risk of impurity penetration at connection points increases
Solution Approach 1:
The protective layer is designed as a flexible thin film that can accommodate the bending movement of the display panel in the bending area while maintaining continuous coverage over the connection points, preventing impurity penetration during flexing operations.
Solution Approach 2:
The protective layer is applied to the connection area before the display panel undergoes bending or flexing operations, establishing protection in advance before any potential impurity ingress can occur during the bending process.
3Reliability
If a protective layer is applied to cover the first substrate surface and side surface, then impurity penetration is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The protective layer is implemented as a flexible thin film that conforms to the contours of the first substrate surface and side surface, achieving comprehensive coverage without requiring extremely tight manufacturing tolerances on the substrate geometry itself.
Solution Approach 2:
The protective layer extends beyond the minimum required coverage area, providing excessive coverage that ensures complete protection of the first substrate surface and side surface even with normal variations in manufacturing precision, thereby compensating for potential coverage gaps.
Data Source
AI summary
A display device includes a display panel including a first surface and a second surface and displaying an image; a substrate disposed on the second surface of the display panel and including a first substrate surface and a side surface that intersect; a flexible circuit board connected to a portion of the display panel; a pad unit electrically connecting the flexible circuit board and the display panel; and a protective layer disposed on one surface of the flexible circuit board, wherein the one surface of the flexible circuit board is a surface of the flexible circuit board facing the display panel, and the protective layer covers at least a portion of the first substrate surface and the side surface.