Stretchable Display Device With Curved Connecting Lines
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Solution Overview
Problem
Conventional display devices are prone to damage when bent or stretched, particularly due to stress on connecting lines, which can lead to electrical signal disruption and increased manufacturing costs.
Innovation Solution
A stretchable display device design featuring a flexible substrate with rigid island substrates and conductive reinforcing members to minimize damage to connecting lines, ensuring smooth electrical signal transmission even under deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is bent or stretched to achieve flexibility, then the adaptability and ease of operation are improved, but the connecting lines are damaged and electrical signal transmission is disrupted
Solution Approach 1:
The display device is divided into multiple rigid island substrates spaced apart on a flexible substrate, with connecting lines bridging the gaps. This segmentation allows the overall structure to flex while maintaining functional integrity of individual components.
Solution Approach 2:
Conductive reinforcing members are introduced as intermediary elements between the rigid island substrates and the flexible substrate. These reinforcing members protect the connecting lines from damage during bending and stretching, ensuring continuous electrical signal transmission.
2Strength
If rigid substrates are used to ensure structural stability, then the strength and reliability are improved, but the device cannot be bent or stretched
Solution Approach 1:
The display is segmented into multiple rigid island substrates that are spatially separated and mounted on a flexible substrate. Each island substrate maintains structural stability for its local components, while the flexible substrate enables overall device deformation.
Solution Approach 2:
Different parts of the device have different mechanical properties: rigid island substrates provide local structural stability where display elements are mounted, while the flexible substrate provides global flexibility for bending and stretching.
3Reliability
If connecting lines are made straight to minimize damage, then the reliability is improved, but the pads cannot be connected between spaced island substrates
Solution Approach 1:
The connecting lines are designed with curved shapes rather than straight lines, allowing them to bridge the gaps between spaced island substrates while accommodating the flexible substrate's deformation during bending and stretching.
Solution Approach 2:
Conductive reinforcing members serve as intermediaries that provide mechanical support to the curved connecting lines, preventing them from breaking even when bent at angles necessary to connect pads on spaced island substrates.
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 allows for easy bending and stretching of the display device while reducing damage to connecting lines, maintaining electrical signal integrity and minimizing manufacturing costs.
Implementation Method 1
including a base polymer and conductive particles distributed in an upper portion of the base polymer and having density that decreases with distance from the uppermost surface of the base polymer
Implementation Method 2
connecting pads on a plurality of island substrates and including a conductive reinforcing member made of a metal material and disposed over or under the connecting line
Implementation Method 3
disposing a conductive reinforcing member over or under the connecting line at a peak area of a connecting line having a curved shape or at the inner edge of the peak area
Data Source
AI summary
A stretchable display device comprises a lower substrate; a plurality of island substrates where a plurality of pixels is defined, spaced apart from each other and disposed on the lower substrate and; a plurality of connecting lines electrically connected to a plurality of pads disposed on adjacent island substrates among the plurality of island substrates, wherein the plurality of connecting lines has a curved shape; and a plurality of conductive reinforcing members in contact with a portion of each connecting line.