Stretchable Display Device With Hourglass Connecting Substrates
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Solution Overview
Problem
Conventional display devices lack mechanical stability and reliability when stretched or contracted, leading to stress on their components, which can result in damage and reduced functionality.
Innovation Solution
A stretchable display device design featuring a flexible lower substrate, rigid second substrates, connecting substrates with a curved hourglass shape, and conductive connection lines, along with an upper substrate that can absorb stress, allowing the device to expand and contract while maintaining image display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display device is made rigid to maintain structural integrity, then strength is improved, but the device cannot be stretched or bent
Solution Approach 1:
The display device is divided into multiple rigid second substrates that are separated from each other, with flexible connecting substrates positioned between them. This segmentation allows the rigid display areas to maintain structural integrity while the flexible connecting regions enable stretching and bending movements.
Solution Approach 2:
The connecting substrates are designed as flexible structures with curved hourglass shapes that can deform elastically. These flexible connecting regions act as joints between rigid substrates, allowing the overall device to be stretched or bent without compromising the rigidity of the display areas.
2Reliability
If the connecting substrates are made rigid to maintain stability, then reliability is improved, but stress concentration occurs during stretching
Solution Approach 1:
The connecting substrates are designed with curved hourglass shapes rather than straight rigid structures. This curvature allows the connecting regions to deform more uniformly during stretching, distributing stress more effectively and preventing stress concentration at specific points while maintaining mechanical stability.
Solution Approach 2:
The cross-sectional area of the connecting substrates varies along their length, with narrower middle portions and wider end portions. This parameter change in geometry allows the connecting substrates to flex and absorb stress during stretching while maintaining sufficient structural integrity for reliable operation.
3Adaptability or versatility
If the substrates are made flexible to enable stretching, then adaptability is improved, but mechanical stability deteriorates
Solution Approach 1:
The device is segmented into rigid second substrates containing display elements and flexible connecting substrates. This segmentation creates a composite structure where rigid portions maintain mechanical stability and display quality, while flexible portions provide stretchability and adaptability.
Solution Approach 2:
The display device uses a composite structure combining rigid substrates (for stability and display functionality) with flexible connecting substrates (for stretchability). This composite design allows the device to exhibit both mechanical stability in display areas and flexibility in connecting regions simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances mechanical stability and reliability by reducing stress on components during stretching, preventing damage and ensuring continuous image display, even when the device is bent or stretched.
Implementation Method 1
an upper substrate covering the first substrate and the plurality of light emitting elements; and wherein at least one of the first substrate and the upper substrate is configured to have a tensile fracture rate equal to or larger than 100%
Implementation Method 2
a plurality of connecting substrates positioned between the plurality of second substrates to interconnect two adjacent second substrates, the connecting substrate comprising a portion having a narrower width than other portion of the connecting substrate
Data Source
AI summary
The present disclosure discloses a stretchable display device, including a lower substrate as a first substrate, the lower substrate having an active area and a non-active area surrounding the active area; a plurality of second substrates positioned on the lower substrate and horizontally separated from each other; a transistor disposed on the second substrate; a plurality of light emitting elements disposed above the transistor and above the plurality of second substrates; a plurality of connecting substrate positioned between the plurality of second substrates to interconnect two adjacent second substrates. With this structure of the display, especially to the structure of the connecting substrate and the connection line, the stress applied to the stretchable display the connecting lines may be attenuated.