Elastic Align Keys for Stretchable Displays
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Solution Overview
Problem
Stretchable display devices face stress and cracking issues when stretched due to the rigidity of align keys, which can lead to reliability concerns and defects in the display.
Innovation Solution
The use of elastic material-based align keys with reflective particles, dispersed in a base resin, is introduced to minimize stress and prevent cracking by allowing the align keys to stretch with the display device, while maintaining accurate positioning during the transfer process of LED components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid align keys are used in the stretchable display device, then positioning accuracy during LED transfer is improved, but stress concentration and cracking occur when the device is stretched
Solution Approach 1:
The align keys are changed from rigid material to elastic material, fundamentally changing the mechanical parameter of the align keys from rigid to flexible. This allows the align keys to stretch with the display device while maintaining positioning functionality, resolving the contradiction between positioning accuracy and cracking resistance
Solution Approach 2:
The align keys are formed as a composite structure including an elastic material base and reflective particles. The elastic material provides stretchability and stress distribution, while the reflective particles maintain visibility and positioning accuracy during the LED transfer process, combining the benefits of both material types
2Reliability
If elastic material is used for align keys, then stress is reduced and cracking is prevented when stretching, but positioning precision may be compromised
Solution Approach 1:
The align keys incorporate reflective particles within the elastic material matrix. The reflective particles serve as visible markers that maintain their positional relationship with the LED components, ensuring positioning accuracy is not compromised despite the elastic nature of the base material
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
This solution reduces stress and prevents cracking in the stretchable display device, enhancing its reliability and durability by using elastic align keys that can stretch with the device, ensuring accurate LED transfer and improved performance.
Implementation Method 1
a plurality of align keys disposed in a portion of the plurality of third areas and formed of an elastic material
Implementation Method 2
the plurality of align keys include an elastic resin and reflective particles dispersed in the elastic resin
Data Source
AI summary
A stretchable display device according to embodiments of the present disclosure includes a plurality of first substrates in which a plurality of pixels are defined, the plurality of first substrates being spaced apart from each other; a plurality of second substrates disposed between first substrates adjacent to each other among the plurality of first substrates to connect the adjacent first substrates; a lower substrate on which a plurality of first areas, a plurality of second areas, and a plurality of third areas excluding the plurality of first areas and the plurality of second areas are defined, the plurality of first substrates being disposed in the plurality of first areas, and the plurality of second substrates being disposed in the plurality of second areas; and a plurality of align keys disposed in a portion of the plurality of third areas and formed of an elastic material.