Transparent Conductive Film for Selective Dual-Side Laser Etching
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Solution Overview
Problem
Current methods for producing foldable touch panels with transparent conducting films face challenges in achieving thin film durability and selective etching of conducting layers without laser penetration through the substrate, leading to inefficiencies in pattern formation and increased film thickness.
Innovation Solution
A transparent conducting film with a resin substrate and ultraviolet absorbent, featuring nano-structured metal nanowire intersections and protection layers on both faces, allows for selective laser etching of one conducting layer while preventing laser penetration to the other side, enabling distinct patterns on each face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the resin film thickness is reduced to achieve thin film durability, then the film becomes more foldable, but laser rays penetrate through the substrate during laser etching
Solution Approach 1:
An ultraviolet absorbent layer is introduced as an intermediary substance within the resin film to selectively absorb laser rays at wavelengths of 350 nm or less. This mediator allows the film to remain thin while preventing harmful laser penetration through the substrate during the etching process.
Solution Approach 2:
The optical properties of the resin film are modified by changing its chemical composition to include ultraviolet absorbents. This parameter change enables the film to maintain thin dimensions while acquiring the ability to block specific laser wavelengths, resolving the contradiction between thickness and laser penetration resistance.
2Manufacturing precision
If laser etching is applied to the transparent conducting layer, then the conducting pattern is formed, but the laser rays penetrate through the thin substrate and treat the opposite conducting layer
Solution Approach 1:
The resin film is designed with non-uniform optical properties by locally distributing ultraviolet absorbents. This creates regions with different laser absorption characteristics, allowing selective etching of one conducting layer while protecting the other, thereby achieving both precise pattern formation and operational control.
Solution Approach 2:
The ultraviolet absorbent acts as a mediator that selectively interacts with laser rays at specific wavelengths. By positioning this intermediary layer, the process achieves precise control over which conducting layer is etched, enabling selective treatment without affecting the opposite layer.
3Adaptability or versatility
If a transparent conducting film with conducting layers on both faces is used, then one film can serve as both X and Y sensors, but the overall film thickness increases
Solution Approach 1:
The transparent conducting film is designed with conducting layers on both faces, enabling a single film to perform multiple functions as both X and Y sensors. This multi-functional design maximizes adaptability while the thin-film structure with ultraviolet absorbent maintains minimal thickness by preventing laser penetration issues.
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
This approach enables the formation of transparent conducting patterns with superior processability and thin film durability, ensuring the film's foldability and reducing the overall thickness of the touch panel.
Implementation Method 1
the resin film contains a base resin and an ultraviolet absorbent, and has a light transmittance of 10% or less in a region of wavelength 350 to 370 nm
Implementation Method 2
patterning each of the transparent conducting layers by laser-etching
Implementation Method 3
When a transparent conducting film is made into a sensor, in general, a conducting layer that is a solid pattern film, needs to be subjected to etching to form a wire pattern
Data Source
AI summary
A transparent conducting film including a first and second transparent conducting layers each containing a binder resin and a nano-structured network having metal nanowire intersections, and first and second protection layers, which are sequentially formed on the first and second main faces, respectively, of a resin film containing a base resin and an ultraviolet absorbent. The resin film has a light transmittance of 10% or less in a region of wavelength 350 to 370 nm in an optical transmission spectrum, and a film of the base resin having a thickness same as the thickness of the resin film has a light transmittance of 80% or more in a region of wavelength 350 to 700 nm.