Organic-Inorganic Insulating Layer Design for Flexible Display Moisture Protection
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Solution Overview
Problem
Flexible display apparatuses face issues with moisture permeation and damage when bent, particularly at the pad unit area, leading to potential detachment and cracking.
Innovation Solution
A display apparatus design featuring an organic insulating layer covering the display area and adjacent peripheral areas, with an inorganic insulating layer extending between the organic layer and the pad unit, and a thin film encapsulation layer to prevent moisture ingress, while ensuring the inorganic insulating layer is not across the bending axis to maintain flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic insulating layer is extended to cover the pad unit area for moisture protection, then moisture permeation resistance is improved, but flexibility and bendability deteriorate due to cracking
Solution Approach 1:
The insulating layer is divided into two distinct parts: an organic insulating layer that covers the display area and provides flexibility, and a separate inorganic insulating layer that covers only the peripheral area and pad unit for moisture protection. This segmentation allows each material to perform its optimal function without compromising the other.
Solution Approach 2:
Different insulating materials are applied to different regions of the substrate based on specific functional requirements. The organic insulating layer is used where flexibility is needed (display area), while the inorganic insulating layer is used where moisture protection is critical (peripheral area and pad unit), creating local optimization of properties.
2Reliability
If the inorganic insulating layer is placed across the bending axis for complete coverage, then moisture protection is improved, but damage during bending increases due to cracking
Solution Approach 1:
The inorganic insulating layer is extracted from the bending area and positioned only in the peripheral region away from the bending axis. This removal from the stress zone prevents cracking during bending while maintaining moisture protection functionality in the peripheral area where the layer remains.
Solution Approach 2:
The inorganic insulating layer is strategically positioned to prevent moisture ingress at the peripheral area and pad unit before bending damage can occur. By placing it away from the bending axis, the design preemptively avoids the cracking issue while maintaining protective coverage where needed.
3Reliability
If the organic insulating layer is extended to cover the entire peripheral area for continuous coverage, then moisture permeation resistance is improved, but manufacturing complexity increases due to alignment requirements
Solution Approach 1:
The insulating coverage is segmented into two separate layers with distinct coverage areas rather than using a single continuous layer. This segmentation simplifies manufacturing by allowing each layer to be deposited independently on its designated region without requiring precise alignment between overlapping layers across the entire peripheral area.
Solution Approach 2:
Instead of uniformly covering the entire peripheral area with one layer, different insulating materials are applied locally to specific regions based on functional needs. This local application approach reduces manufacturing complexity by eliminating the need for complex alignment procedures across the full peripheral perimeter.
Data Source
AI summary
A display apparatus capable of preventing (or protecting from) permeation of moisture. The apparatus includes a substrate comprising a display area and a peripheral area surrounding the display area; a pad unit located on the peripheral area; an organic insulating layer covering the display area and a part of the peripheral area adjacent to the display area; and an inorganic insulating layer that covers at least a first area when the first area is a part between the organic insulating layer and the pad unit.