Organic Layer Between Signal Layers for Bendable Display
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Solution Overview
Problem
Conventional display devices face stress-related issues during bending, leading to potential breakage and signal line disruption due to the brittleness of inorganic layers and uneven stress distribution.
Innovation Solution
The design incorporates a substrate with a first region that is bendable and a second region with a signal line structured in multiple layers, where organic layers are used in grooves to reduce stress and maintain contact, while inorganic layers are strategically removed or positioned to minimize deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inorganic layers are used in the signal line structure, then manufacturing precision and structural stability are improved, but brittleness increases leading to breakage during bending
Solution Approach 1:
The signal line is divided into multiple segments along its length, with different regions (first region, second region, third region) having different structural configurations. This segmentation allows each region to be optimized independently - some regions have complete inorganic layers for stability, while others have removed or reduced inorganic layers to prevent breakage during bending operations.
Solution Approach 2:
Different portions of the signal line are assigned different structural qualities. Specifically, the inorganic layer is selectively removed or reduced in certain regions (such as where grooves are formed) while maintained in other regions. This local variation in material presence allows the signal line to have both stable regions and flexible regions, resolving the contradiction between overall structural stability and local resistance to bending-induced breakage.
2Adaptability or versatility
If the display device is made bendable, then adaptability and versatility are improved, but stress concentration occurs leading to signal line disruption
Solution Approach 1:
The display device structure is made non-uniform by selectively removing or reducing the inorganic layer in specific regions, creating areas with different mechanical properties. This allows the device to bend in designated regions without causing stress concentration that would disrupt the signal line, while maintaining reliability in regions where the complete inorganic layer structure is preserved.
Solution Approach 2:
The device is segmented into regions with different structural characteristics. The signal line pathway is divided into sections where some have full inorganic layer protection and others have modified inorganic layer structures. This segmentation enables the device to achieve bending capability in certain areas while maintaining signal line integrity through alternative structural support in other areas.
3Manufacturing precision
If uniform inorganic layer coverage is maintained, then manufacturing precision is improved, but stress distribution becomes uneven during bending
Solution Approach 1:
The inorganic layer coverage is intentionally made non-uniform by selectively removing or reducing it in specific regions. This local modification creates areas with different stress characteristics, allowing stress to be distributed more evenly throughout the device during bending. The regions with reduced inorganic layer content can accommodate bending-induced stress without creating concentration points, while maintaining adequate layer alignment and coverage in regions where complete coverage is preserved.
Data Source
AI summary
A display device including: a substrate including a first region and a second region; a signal line on the substrate and including a first layer and a second layer that overlap each other; and a first insulating layer between the substrate and the signal line, wherein a first organic layer may be between the first layer and the second layer in the first region, and the first layer and the second layer may be in direct contact with each other in the second region, and the first insulating layer may be disposed in an area in which the first organic layer is.