Stretchable Micro-LED Display With Liquid Metal Wiring Stability
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Solution Overview
Problem
Existing stretchable displays face issues with mechanical stability and electrical performance due to deformation of wiring, leading to cracks and damage.
Innovation Solution
A stretchable display is designed using a liquid metal-based wire that is not curved, integrated with pixel islands and bus wires on a stretchable substrate, and replaces capacitors with ferroelectric thin-film transistors to enhance mechanical stability and electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a winding-shaped wiring pattern is applied for stretchable interconnection, then the display can be stretched, but the wiring becomes vulnerable to deformation and cracks
Solution Approach 1:
The display is divided into discrete pixel islands that are spatially separated and independently supported by posts, allowing the substrate to stretch without transmitting deformation forces through continuous wiring structures. This segmentation isolates potential stress concentration points and prevents crack propagation across the entire display.
Solution Approach 2:
The wiring pattern transitions from a planar two-dimensional layout to a three-dimensional structure by routing wires over posts and through vertical spaces. This dimensional change allows the wiring to accommodate substrate deformation through vertical displacement rather than experiencing in-plane tensile stress that would cause cracking.
2Stability of the object's composition
If pixel islands are integrated with liquid metal-based wires on a stretchable substrate, then mechanical stability is improved, but manufacturing complexity increases
Solution Approach 1:
Posts are pre-formed on the substrate before pixel islands are attached. This preliminary structuring creates predetermined attachment locations and establishes the mechanical support framework in advance, simplifying the subsequent pixel island integration process and ensuring proper alignment without requiring complex real-time positioning systems.
Solution Approach 2:
Liquid metal-based wires serve as intermediary connection elements between pixel islands and bus wires. These liquid metal wires can be easily deposited and patterned, providing a simple bridging mechanism that connects discrete components without requiring direct soldering or complex bonding processes between all components.
3Area of moving object
If capacitors are replaced with ferroelectric thin-film transistors in each pixel island, then area is minimized and operational stability is ensured, but manufacturing precision requirements increase
Solution Approach 1:
The ferroelectric thin-film transistor serves multiple functions simultaneously: it acts as the switching transistor for the pixel circuit and also provides the capacitor function through its ferroelectric layer's ability to retain electrical charge. This multi-functionality eliminates the need for a separate capacitor structure, minimizing pixel island area despite the increased precision requirements for fabricating the multifunctional device.
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 solution minimizes the occurrence of cracks and damage, secures excellent electrical characteristics, and ensures operational stability by maintaining the integrity of the display under deformation.
Implementation Method 1
a plurality of pixel wires formed based on a liquid metal and connecting adjacent pixel islands among the pixel islands to each other
Implementation Method 2
applying a liquid metal onto the stretchable substrate coated with the negative PR
Implementation Method 3
the thin-film transistor and the micro-LED may be bonded through solder and flux formed on the thin-film transistor
Implementation Method 4
the pixel islands may be formed on the stretchable substrate based on a transfer process and a laser cutting process
Implementation Method 5
replacing a capacitor provided in each pixel island with a ferroelectric thin-film transistor
Data Source
AI summary
The present disclosure relates to a stretchable display and a method of manufacturing the same. The stretchable display according to one embodiment includes a stretchable substrate; a plurality of pixel islands formed on the stretchable substrate, wherein each of the pixel islands includes at least one thin-film transistor and one micro-LED; a plurality of pixel wires formed based on a liquid metal and connecting adjacent pixel islands among the pixel islands to each other; and a plurality of bus wires formed based on the liquid metal and connected to at least one pixel island among the pixel islands.