Stretchable Touchscreen Nanowire Electrodes Groove Substrate
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Solution Overview
Problem
Conventional touchscreens are prone to cracking or failure when applied to stretchable display devices due to their rigid and vulnerable electrodes, which break under stress, leading to electrical disconnection during elongation.
Innovation Solution
A stretchable touchscreen design featuring a substrate with a modulus of 100 MPa to 200 MPa, grooves filled with nanowires, and a protective film, allowing the electrodes to maintain electrical connection and flexibility, preventing breakage and ensuring reliable touch detection even upon elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transparent electrodes are used in touchscreens, then touch detection function is achieved, but the electrodes are vulnerable to impact and cracking under stress during elongation
Solution Approach 1:
The patent replaces conventional rigid transparent electrodes with flexible nanowire-based electrodes that can withstand stretching and deformation. The nanowires are embedded in a flexible substrate, allowing the electrode structure to maintain electrical connection even when bent or elongated, thus resolving the contradiction between reliability and strength under mechanical stress.
Solution Approach 2:
The patent employs composite material structures where nanowires are integrated with flexible polymers or elastomers to create stretchable electrodes. This composite approach combines the electrical conductivity of nanowires with the mechanical flexibility of the polymer matrix, enabling the electrode to maintain both functionality and structural integrity during deformation.
2Reliability
If touch electrodes are disposed lengthwise in transmission direction to ensure electrical connection, then electrical connectivity is maintained, but the electrodes crack under lengthwise stress during elongation
Solution Approach 1:
The patent transforms the static electrode structure into a dynamic one where nanowires can rearrange and deform elastically under stress. The flexible substrate allows the electrode pattern to dynamically adapt to stretching forces, maintaining electrical pathways even when the physical configuration changes during elongation.
Solution Approach 2:
The patent changes the physical parameters of the electrode material from rigid to flexible by using nanowires embedded in elastomeric substrates. This parameter change allows the electrode to undergo large deformations without cracking, maintaining structural stability while accommodating the dynamic mechanical stresses of stretchable display devices.
3Reliability
If touch electrodes are divided into predetermined patterns for connection, then electrical connectivity is achieved, but isolation or cracking occurs in the connection parts between electrodes during stretching
Solution Approach 1:
The patent uses flexible nanowire networks and elastomeric interconnection structures that can accommodate stretching forces without cracking. The connection parts between electrode patterns are designed with flexible materials that maintain electrical continuity even under tensile stress, preventing the isolation or cracking issues seen in conventional rigid electrode structures.
4Ease of manufacture
If rigid transparent electrodes are used in touchscreens, then manufacturing simplicity is maintained, but the electrodes are vulnerable to impact and fracture under stress
Solution Approach 1:
The patent replaces the conventional mechanical sputtering or evaporation processes for depositing rigid transparent conductive oxides with nanowire-based fabrication methods. While the nanowire fabrication process is more complex, it produces electrodes with superior mechanical properties that can withstand stretching and impact, thus trading some manufacturing simplicity for significantly improved reliability under stress.
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 enables the stretchable touchscreen to return to its original state without resistance change, maintaining electrical reliability and preventing electrode fracture, thus addressing the limitations of conventional touchscreens in flexible and stretchable display applications.
Implementation Method 1
a substrate having a modulus of 100 MPa to 200 MPa... allowing the electrodes to maintain electrical connection and flexibility, preventing breakage and ensuring reliable touch detection even upon elongation
Data Source
AI summary
Disclosed are a stretchable touchscreen, a method for manufacturing the same and a display device including the same. After using a material having a high elastic restoring force as a substrate and determining regions where touch electrodes are formed by defining grooves thereon, touch electrodes are formed by filling the grooves with nanowires. Accordingly, it is possible to maintain elastic restoring force of the substrate and electrical connection between wires of nanowires, so that the touch electrode neither breaks nor factures despite being stretched any direction, and reliable stretchable touchscreens can be provided due to no resistance increase.