Pad Insulating Structure for Display Touch Reliability
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Solution Overview
Problem
In light emitting display devices, the delamination phenomenon and cracking issues occur due to the use of open masks during the formation of inorganic encapsulation layers in the pad areas, which affect the reliability and durability of the touch sensing units.
Innovation Solution
A method of manufacturing a light emitting display device where the pad part in the non-display area includes a conductive part and an insulating part with specific openings, allowing for the formation of a touch sensing unit without using an open mask, thereby eliminating delamination and cracking by fully removing the inorganic encapsulation layer at the pad part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an open mask is used during the formation of inorganic encapsulation layers in the pad area, then the inorganic encapsulation layer can be formed, but delamination and cracking occur affecting reliability
Solution Approach 1:
The patent extracts and removes the inorganic encapsulation layer specifically from the pad area where it causes delamination and cracking. By taking out the harmful portion (inorganic encapsulation layer) from the problematic region (pad area), the solution eliminates the root cause of reliability issues while preserving the encapsulation structure in the display area where it provides protection.
Solution Approach 2:
The patent applies different structural configurations to different areas: the display area retains the full inorganic encapsulation layer structure for protection, while the pad area has the inorganic encapsulation layer removed to prevent delamination. This local differentiation of quality and structure resolves the contradiction by optimizing each area for its specific function.
2Reliability
If the inorganic encapsulation layer is fully removed at the pad part, then delamination and cracking are prevented, but the structural integrity may be compromised
Solution Approach 1:
The patent maintains structural integrity by preserving the inorganic encapsulation layer in the display area while removing it only from the pad area. The insulating layer provides localized structural support at the pad area, creating a differentiated structure where each region has the appropriate composition for its function.
3Reliability
If a complex multi-layer insulating structure is used at the pad part, then electrical isolation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the insulating layer with the encapsulation structure, allowing it to serve dual functions: providing electrical isolation for the pad area and maintaining structural integrity. This consolidation reduces the number of separate components and simplifies the overall manufacturing process.
Data Source
AI summary
A display device includes a display area, anon-display area, and a pad part in the non-display area and exposed to outside the display device. The pad part includes a conductive part, and an insulating part defining an opening exposing the conductive part to outside the pad part. The insulating part includes in order from the conductive part a first insulating layer defining a first opening, and a second insulating layer facing the first insulating layer and defining a second opening which is wider than the first opening.