Bendable Touch Window Composite Electrode Design
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Solution Overview
Problem
Indium tin oxide (ITO) used in touch panels is prone to physical damage when the substrate is flexed or bent, making it unsuitable for flexible devices, and existing touch panels lack durability and reliability in flexible applications.
Innovation Solution
A flexible touch window with a curved or bendable design, featuring a cover substrate made of materials like glass or plastic, and a sensing electrode disposed on a substrate that applies compressive force when bent, reducing the risk of damage and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO is used as the transparent electrode material in touch panels, then the electrode property and transparency are improved, but the durability and reliability deteriorate when the substrate is flexed or bent
Solution Approach 1:
The patent replaces single-material ITO electrodes with composite electrode structures consisting of multiple layers including transparent conductive oxides (ITO, IZO, INO), metal layers (Al, Ag, Mo, W), and conductive polymers (PEDOT:PSS). This composite approach combines the transparency of oxides with the flexibility and durability of metals and polymers, resolving the contradiction between electrode property and resistance to physical damage during bending.
Solution Approach 2:
The patent changes the physical and chemical parameters of electrode materials by using ultra-thin metal layers (5-50 nm), controlling oxidation states, and adjusting composition ratios in composite structures. These parameter changes enable the electrodes to maintain electrical conductivity while achieving flexibility and bendability, thus improving reliability without sacrificing strength.
2Adaptability or versatility
If the touch panel is made flexible or bendable to extend user experience, then the adaptability and user experience are improved, but the electrode is easily subject to physical damage
Solution Approach 1:
The patent employs ultra-thin film structures (metal layers of 5-50 nm, oxide layers of 50-200 nm) that inherently provide flexibility while maintaining integrity. These thin films can bend without cracking, enabling the touch panel to achieve adaptability for flexible applications while preserving electrode reliability through the thin-film architecture.
Solution Approach 2:
The patent introduces intermediate buffer layers and adhesive layers between the ITO electrode and the flexible substrate. These intermediary layers act as stress-absorbing mediators that prevent direct transmission of bending stresses to the brittle ITO electrode, thereby protecting electrode integrity while allowing the overall structure to remain flexible and adaptable.
Data Source
AI summary
A touch window includes a substrate; a sensing electrode disposed on the substrate in a bending direction of the substrate; and a wire for electrically connecting the sensing electrode. The sensing electrode includes a first sensing electrode extending in one direction on an effective area; and a second sensing electrode extending in a direction different from the extension direction of the first sensing electrode. The wire includes a first wire connected to the first sensing electrode; and a second wire connected to the second sensing electrode.