Stretchable Display Connecting Lines Flat Surface Design
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Solution Overview
Problem
Conventional stretchable display devices face damage and reduced flexibility due to the modulus difference between substrates and connecting lines, leading to potential damage during bending or stretching, especially with the formation of steps in connecting lines which can cause cracking.
Innovation Solution
A stretchable display panel design featuring a lower substrate with varying modulus areas and individual substrates with higher modulus than the lower substrate, where connecting lines extend flatly without steps, using a base polymer and conductive particles to form conductive paths that maintain electrical connectivity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting lines are formed on individual substrates with different modulus than the lower substrate, then electrical connectivity is achieved, but steps are formed in the connecting lines causing damage during bending or stretching
Solution Approach 1:
The patent applies this principle by forming the connecting lines as thin film structures that extend flatly from the individual substrates to the lower substrate. The thin film configuration allows the connecting lines to flex and deform elastically during bending or stretching without forming steps or cracks, thereby maintaining electrical connectivity while improving damage resistance.
2Strength
If individual substrates have higher modulus than the lower substrate, then structural support is provided, but flexibility is reduced during deformation
Solution Approach 1:
The patent applies this principle by dividing the substrate structure into multiple segments: individual substrates with higher modulus for structural support, and a lower substrate with lower modulus for flexibility. The connecting lines bridge these segments, allowing the structure to maintain both strength and adaptability during deformation.
Solution Approach 2:
The patent applies this principle by creating different modulus regions in the substrate structure. The individual substrates have higher modulus to provide local structural support, while the lower substrate has lower modulus to provide overall flexibility. This local differentiation of material properties allows the structure to simultaneously achieve both strength and adaptability.
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 design enhances the display's flexibility and minimizes damage during deformation by ensuring the connecting lines remain intact and functional, maintaining electrical connectivity and reducing the risk of cracking, thus improving the reliability and durability of the display.
Implementation Method 1
using a base polymer and conductive particles to form conductive paths that maintain electrical connectivity
Implementation Method 2
the lower substrate has a modulus that is different for each area, and the elastic modulus of the plurality of individual substrates is higher than that of at least one part of the lower substrate
Data Source
AI summary
Disclosed herein are a stretchable display panel and device and a manufacturing method thereof. The stretchable display panel comprises: a lower substrate having an active area and a non-active area surrounding the active area; a plurality of individual substrates disposed on the lower substrate and located in the active area; a plurality of pixels disposed on the plurality of individual substrates; and a connection line disposed between the plurality of individual substrates and the lower substrate, wherein the modulus of the plurality of individual substrates is higher than that of at least one part of the lower substrate, and wherein the connecting line extends to the bottom surface of the individual substrates, such that the connecting line electrically connects a pad disposed on the individual substrates without a step in the top surface of the connecting line. That is, the connecting line has a uniform height from the lower substrate for its entire length. Accordingly, the stretchable display device according to the present disclosure may reduce damage to the connecting line due to a step of the connecting line, so reliability of the stretchable display device may be improved.