Foldable Flexible Touch Screen Electrode Design
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Solution Overview
Problem
Conventional flexible touch screens suffer from low bending resistance and defective wiring due to deformation, leading to poor product quality, primarily because of the brittleness of indium tin oxide (ITO) transparent electrodes.
Innovation Solution
A foldable flexible touch screen design that incorporates transparent electrode materials with improved bending resistance, such as silver nanowires, conductive polymers, or graphene, in the folded section, while using ITO or the same material outside the folded section, along with a structured arrangement of drive and sensing electrodes and circuit board binding areas to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO transparent induction electrode is used in the flexible touch screen, then the preparation process is mature and light transmittance is high, but the electrode easily generates stress concentration, cracking and expanding when folded, resulting in poor touch performance
Solution Approach 1:
The patent applies different electrode materials to different regions of the flexible touch screen. The folded section uses alternative materials (silver nanowires, graphene, conductive polymers) with high bending resistance, while non-folded sections can use conventional ITO material. This local differentiation resolves the contradiction by providing enhanced flexibility where needed while maintaining the advantages of ITO where folding stress is not present.
Solution Approach 2:
The patent employs composite electrode structures combining multiple materials. In the folded section, alternative transparent conductive materials are used that offer both flexibility and conductivity. These materials can be combined with ITO in layered structures or used as replacements in specific regions, creating a composite system that achieves both mature process compatibility and improved bending resistance.
2Strength
If alternative materials such as silver nanowires, graphene, carbon nanotube, or conductive polymers are used instead of ITO, then bending resistance and flexibility are improved, but the cost of material synthesis is higher and mass production is not yet achieved
Solution Approach 1:
Instead of replacing ITO throughout the entire flexible touch screen, the patent applies alternative materials only in the folded section where bending resistance is critical. This localized approach reduces material costs while still providing the necessary flexibility and durability in the high-stress region.
Solution Approach 2:
The patent implements alternative materials partially - only in the folded section rather than universally across the entire display. This partial application achieves the necessary bending resistance improvement while minimizing the increase in production cost, as the alternative materials are used only where absolutely necessary for functionality.
3Shape
If the flexible touch screen is designed to be foldable, then lightness and thinness are achieved, but defective wiring caused by deformation occurs, influencing product quality
Solution Approach 1:
The patent addresses wiring reliability by applying different electrode materials to different regions. The folded section uses alternative materials (silver nanowires, graphene, conductive polymers) that maintain electrical connectivity during bending, while non-folded sections use conventional ITO. This regional differentiation ensures that wiring integrity is maintained in the high-stress folded area while keeping overall product quality high.
Solution Approach 2:
The patent creates a composite electrode system where alternative flexible conductive materials are integrated with or replace ITO in the folded section. This composite structure maintains electrical functionality during deformation by using materials that can accommodate bending stresses without breaking, thus preserving product quality in the foldable design.
Data Source
AI summary
A flexible touch screen fold along middle is provided. The flexible touch screen has a window region with a touch function, a folded section, and a non-window region for arranging leads. A part of the electrodes located at the folded section is made of transparent electrode material with a bending resistance. Because the electrodes of the folded section are made of the material with a bending resistance, the bending stress of the electrodes at the folded area of the flexible touch display panel can be improved, and the service life of the flexible touch display panel can be increased.