Stretchable Display Wiring Structure for Crack-Resistant Conductivity
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Solution Overview
Problem
Current stretchable display devices face challenges in maintaining durability and preventing abnormal transformation under tensile and compressive forces due to stress-induced cracks in the wiring, leading to potential disconnection and loss of functionality.
Innovation Solution
A stretchable display device design featuring a substrate with island areas, connection areas, and organic insulating layers, where the wiring includes a first conductive layer with high electrical conductivity, such as conductive porous carbon, and a second conductive layer with materials like aluminum, copper, or gold, arranged in a way that absorbs stress and maintains connectivity even under deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer metal wiring structure is used, then electrical conductivity is high, but the wiring is prone to stress-induced cracks and disconnection under tensile and compressive forces
Solution Approach 1:
The wiring structure employs a composite design with a first conductive layer (metal layer) and a second conductive layer (conductive polymer layer). This composite structure combines the high electrical conductivity of metals with the flexibility and stress resistance of conductive polymers, preventing stress-induced cracks while maintaining electrical performance under tensile and compressive forces.
Solution Approach 2:
The invention changes the material parameters by introducing a conductive polymer layer with different mechanical properties than the metal layer. The conductive polymer layer has higher elasticity and can undergo larger deformations without cracking, thereby changing the overall mechanical parameters of the wiring to resist stress-induced failures.
2Strength
If the wiring structure is made more complex with multiple layers, then stress resistance improves, but manufacturing complexity increases
Solution Approach 1:
The invention applies local quality by placing the conductive polymer layer specifically in regions prone to stress concentration, such as the connection area between island areas and the bent area. This targeted approach provides enhanced stress resistance where needed most, while keeping other areas simpler, thus balancing strength improvement with manufacturing complexity.
Solution Approach 2:
The wiring is segmented into multiple functional layers: a first conductive layer (metal) for primary electrical conduction and a second conductive layer (conductive polymer) for stress management. This segmentation allows each layer to perform its specialized function, improving overall stress resistance while maintaining a manageable structural complexity through clear functional division.
3Strength
If the conductive polymer layer is made thicker, then stress absorption improves, but electrical conductivity may decrease
Solution Approach 1:
The invention optimizes the thickness parameter of the conductive polymer layer to achieve a balance between stress absorption and electrical conductivity. By carefully controlling the thickness within a specific range, the conductive polymer layer provides sufficient stress absorption capacity while maintaining adequate electrical conductivity through proper material selection and layer design.
Solution Approach 2:
The composite structure of metal layer and conductive polymer layer works synergistically to resolve the thickness dilemma. The metal layer provides the primary electrical conduction path with high conductivity, while the conductive polymer layer provides stress absorption. This composite approach allows the conductive polymer layer to be thick enough for stress protection without compromising overall electrical conductivity, as the metal layer compensates for any conductivity reduction.
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 effectively reduces stress-induced cracks in the wiring, enhancing the durability and maintaining functionality of the display device during elongation and contraction, preventing disconnection and ensuring consistent performance.
Implementation Method 1
the wiring includes a first conductive layer including a conductive organic material and a second conductive layer including a material different from that of the first conductive layer
Implementation Method 2
the first conductive layer may include a conductive porous carbon material
Data Source
AI summary
A stretchable display device includes: a substrate including: a first island area and a second island area, spaced apart from each other, and a connection area connected between the first island area and the second island area; a first subpixel circuit disposed in the first island area; a second subpixel circuit disposed in the second island area; a first light-emitting diode disposed in the first island area and electrically connected to the first subpixel circuit; a second light-emitting diode disposed in the second island area and electrically connected to the second subpixel circuit; and a wiring disposed in the connection area and electrically connected to the first subpixel circuit and the second subpixel circuit, where the wiring includes a first conductive layer including a conductive organic material, and a second conductive layer disposed on the first conductive layer and including a material different from that of the first conductive layer.