Flexible Display Insulating Dam Relocation for Stress Reduction
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Solution Overview
Problem
Existing flexible display technologies face challenges in maintaining structural integrity and preventing liquid organic material flow during bending, particularly due to stress vulnerabilities in the bending area where insulating dams are often placed.
Innovation Solution
The flexible display apparatus incorporates insulating dams positioned outside the bending area, utilizing a thin film encapsulation layer with alternately stacked inorganic and organic films, and includes a thin film transistor and organic light-emitting device configuration, with the insulating dams arranged in the edge area to prevent liquid flow and reduce stress on the bending region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If insulating dams are placed in the bending area to prevent liquid organic material flow, then liquid flow prevention is improved, but stress concentration and structural integrity deteriorate
Solution Approach 1:
The insulating dams are extracted from the bending area and relocated to the non-bending area. This removes the harmful element (insulating dams) from the stress-prone bending region while preserving their liquid-blocking function in the safe non-bending area, thus preventing liquid flow without compromising structural integrity during bending operations.
Solution Approach 2:
The non-bending area serves as an intermediary zone where the insulating dams are relocated. This intermediary location allows the dams to perform their liquid-blocking function while being isolated from the mechanical stress of bending, effectively mediating between the need for liquid containment and the need for bending durability.
2Object-generated harmful factors
If insulating dams are positioned in the bending area to ensure liquid containment, then liquid containment is improved, but reliability under bending stress deteriorates
Solution Approach 1:
The insulating dams are extracted from the bending area and repositioned in the non-bending area, eliminating their exposure to bending stresses. This maintains their liquid containment function while ensuring reliability by placing them in a region that does not undergo mechanical deformation during bending operations.
3Adaptability or versatility
If the display substrate is made flexible to enable bending, then adaptability is improved, but stress vulnerability in bending area increases
Solution Approach 1:
The insulating dams are taken out from the bending area, removing the stress vulnerability associated with these rigid structures. This allows the display substrate to maintain its flexibility and bending capability while eliminating the stress concentration points that would compromise reliability during bending.
Solution Approach 2:
The display substrate utilizes a flexible thin film structure that can bend without compromising the integrity of embedded components. By combining this flexible substrate with the relocated insulating dams in the non-bending area, the system achieves both adaptability for bending applications and protection against stress-related failures.
Data Source
AI summary
A flexible display apparatus including a display substrate having a bending area that is bendable in one direction; a thin film encapsulation (TFE) layer on the display substrate; and at least one insulating dam on the display substrate, wherein the at least one insulating dam is outside the bending area.