Stretchable Display Layer Structure for Rigid-Soft Step Transition
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Solution Overview
Problem
Stretchable display devices face issues with structural limitations and defects during the transfer of light-emitting elements due to step differences between rigid and soft portions, which restrict the application of various light-emitting element structures.
Innovation Solution
A stretchable display device design that includes a rigid portion with a thin film transistor and a soft portion with a stretchable line, where the distance between the substrate and the encapsulation layer is greater than the distance between the substrate and the planarization layer, minimizing the step difference and preventing electrical short circuits during the transfer of light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of the soft portion is reduced to secure stretching properties, then stretching capability is improved, but a step difference occurs between the rigid portion and the soft portion, limiting the structure of light-emitting elements and causing defects during transfer
Solution Approach 1:
The patent introduces a buffering layer that extends from the soft portion onto the rigid portion, creating a gradual thickness transition in the vertical dimension. This dimensional approach resolves the step difference by distributing the thickness change across multiple layers rather than a single abrupt transition, enabling both stretching capability and precise light-emitting element transfer.
Solution Approach 2:
The buffering layer acts as an intermediary structure between the rigid portion and the soft portion. It mediates the thickness discrepancy by providing a gradual transition zone, preventing direct contact between the light-emitting element and the step difference, thus eliminating transfer defects while preserving stretching properties.
2Manufacturing precision
If a buffering layer is added to reduce step difference, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The buffering layer is strategically positioned only where needed - extending from the soft portion onto the rigid portion at the interface region. This localized approach provides the necessary thickness transition and structural support precisely where the step difference occurs, while leaving other areas of the device simpler and maintaining overall manufacturing efficiency.
Data Source
AI summary
A stretchable display device includes a first substrate provided with a rigid portion and a soft portion; a thin film transistor in the rigid portion on the first substrate; a planarization layer on the thin film transistor; a stretchable line in the soft portion on the first substrate; an encapsulation layer on the stretchable line; a light-emitting element on the planarization layer and electrically connected to the thin film transistor; and a second substrate spaced apart from the first substrate, wherein a distance between the first substrate and a top surface of the encapsulation layer is greater than a distance between the first substrate and a top surface of the planarization layer.