Deformable Display Substrate With Island-Bridge Segmentation
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Solution Overview
Problem
Deformable display devices often experience cracks or fractures during deformation, reducing their reliability due to the stress on substrates and layers, which is a significant challenge in enhancing their durability and functionality.
Innovation Solution
The design incorporates a patterned substrate with island structures and bridge structures, where the bridge structures are deformable to change the distance between island structures, and a sensing layer with a mesh unit and openings to house light emitting units, using organic insulating materials to reduce the likelihood of cracking, and a dam structure to contain the light emitting units and insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is deformed to enable flexible applications, then adaptability is improved, but cracks or fractures form in the substrate or layers, worsening reliability
Solution Approach 1:
The substrate is divided into multiple island structures connected by bridge structures. This segmentation allows the bridge structures to deform independently during stretching, preventing cracks from propagating across the entire substrate and maintaining device reliability while enabling flexible deformation.
Solution Approach 2:
The patent employs a thin-film structure where the bridge structures are designed to be flexible and deformable. These thin film connections allow the device to stretch and deform without causing fractures in the rigid island structures or layers above, resolving the contradiction between adaptability and reliability.
2Reliability
If the device structure is made rigid to prevent cracks, then reliability is improved, but the device cannot be deformed, worsening adaptability
Solution Approach 1:
By segmenting the substrate into rigid island structures connected by flexible bridge structures, the design allows the rigid portions to maintain reliability while the flexible connections enable deformation, thus achieving both reliability and adaptability simultaneously.
Solution Approach 2:
The bridge structures are designed to dynamically change their shape and distance between island structures during deformation. This dynamic flexibility in the connecting structures allows the overall device to adapt to different shapes while the rigid islands maintain structural integrity and reliability.
3Area of stationary object
If the distance between island structures is reduced to improve device compactness, then area is reduced, but stress concentration increases, worsening reliability
Solution Approach 1:
The bridge structures are designed with specific local properties - they are thinner and more flexible in the connection regions while the island structures maintain their structural integrity. This local quality differentiation allows compact spacing without stress concentration in the rigid islands, maintaining both area efficiency and reliability.
Data Source
AI summary
A display device includes a patterned substrate, a plurality of light emitting unit, a first insulating layer and a sensing layer. The patterned substrate has a plurality of island structures and a plurality of bridge structures, and at least one bridge structure connects two adjacent island structures. At least one light emitting unit is disposed on one of the two adjacent island structures. The first insulating layer is disposed on the light emitting units. The sensing layer is disposed on the first insulating layer and has a mesh unit, the mesh unit has a mesh frame and an opening, and the at least one light emitting unit is disposed in the opening.