Flexible Touch Panel Roll-to-Roll Manufacturing
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Solution Overview
Problem
Existing touch panels face reduced sensor sensitivity and manufacturing inefficiencies due to non-planarized surfaces and material restrictions, particularly when using glass substrates in roll-to-roll processing.
Innovation Solution
A flexible transparent base with a transparent electrode on one surface and a decorative layer on the opposite surface, bonded with an optical clear adhesive to a transparent panel, allowing for roll-to-roll processing and high sensor sensitivity, while enabling the use of various materials including tempered glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin planarizing layer is formed by spin coating, then the manufacturing process is simple, but the degree of planarization is reduced and sensor sensitivity decreases
Solution Approach 1:
The patent removes the separate resin planarizing layer entirely and replaces it with a transparent base that has inherent planarizing properties. This extracts the problematic element (resin layer requiring spin coating) while maintaining the necessary planarization function through the base material's inherent characteristics.
Solution Approach 2:
The patent changes the fundamental parameter of the base material from a processed resin layer to a pre-planarized transparent base (such as glass or flexible transparent polymer). This parameter change eliminates the need for spin coating while providing superior planarization, thereby resolving the contradiction between manufacturing simplicity and planarization quality.
2Ease of operation
If glass panels are divided into separate pieces before stacking layers, then contact with decorative layer is improved, but productivity decreases and quality variations increase
Solution Approach 1:
Instead of dividing glass panels first and then stacking layers, the patent inverts the sequence by first forming the transparent electrode and decorative layer on the complete transparent base, then dividing the base into pieces. This inversion maintains productivity while achieving proper decorative layer contact through the inherent flexibility of the transparent base.
Solution Approach 2:
The patent performs preliminary actions of forming the transparent electrode and decorative layer on the transparent base before division. This preliminary configuration ensures proper layer contact is achieved through the base's inherent properties, eliminating the need for post-division adjustments and maintaining high productivity.
3Strength
If tempered glass is used for the surface panel, then durability is improved, but roll-to-roll processing becomes impossible
Solution Approach 1:
The patent introduces a flexible transparent base as an alternative to rigid tempered glass, enabling roll-to-roll processing. This flexible base maintains sufficient durability for touch panel applications while providing the flexibility needed for continuous roll-to-roll manufacturing processes.
Solution Approach 2:
The transparent base serves multiple functions: it provides the structural foundation, ensures planarization, enables roll-to-roll processing, and allows subsequent division into final products. This multi-functionality replaces the specialized role of tempered glass while expanding manufacturing flexibility and capability.
Data Source
AI summary
An input device is manufactured from a roll of a single-layer flexible transparent base sheet having a first surface and a second surface by forming a transparent electrode pattern and a wiring layer on the first surface. The transparent electrode pattern is disposed in a transparent input region, and the wiring layer extends from an end of the transparent electrode pattern into a decorative region surrounding the transparent input region. A decorative layer pattern is formed on the second surface in the decorative region, while conveying the transparent base sheet through a roll-to-roll processing. The transparent base sheet having the transparent electrode pattern and the decorative layer pattern is divided into individual units. A transparent panel having an operation surface is bonded to the second surface of each of the individual units with an optically clear adhesive layer interposed therebetween.