Wettability-Variable Layer for Fine Conductive Patterns
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Solution Overview
Problem
Conventional printing methods for forming functional material patterns, such as conductive layers in electronic circuits, face challenges in achieving fine patterns due to fluid spreading and agglomeration, making it difficult to form patterns with widths less than several tens of micrometers, which degrades the quality of transistors and electronic displays.
Innovation Solution
A laminated structure with a wettability-variable layer containing a material whose surface energy changes with energy application, featuring high-surface-energy and low-surface-energy areas, allows for the selective deposition and flow of functional fluids to form fine conductive patterns by creating a first area and a second area with a narrower width, enabling the functional fluid to cover the entire high-surface-energy area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional printing methods are used to deposit functional fluid, then the process is simple and equipment costs are low, but the functional fluid spreads and agglomerates making it difficult to form fine patterns with width less than several tens of micrometers
Solution Approach 1:
The patent applies local quality by creating regions with different surface energies on the substrate. A wettability-variable layer is formed that can be selectively activated to create high-surface-energy areas (where functional fluid should deposit) and low-surface-energy areas (where fluid should be repelled). This spatial variation in surface properties enables precise pattern formation with widths of 10 micrometers or less, resolving the contradiction between pattern fineness and process simplicity.
Solution Approach 2:
The patent utilizes parameter changes by modifying the surface energy of the wettability-variable layer through energy application (such as UV irradiation or heat treatment). The layer transitions from a low-surface-energy state to a high-surface-energy state in specific regions, enabling controlled fluid deposition. This dynamic parameter change allows the same substrate to guide fluid patterns of varying dimensions, achieving fine pattern resolution without complex manufacturing processes.
2Manufacturing precision
If photolithography is used to form fine functional material patterns, then manufacturing precision is high, but equipment costs are high and the number of pattern forming steps is large
Solution Approach 1:
The patent merges the functions of multiple separate processes into a single integrated approach. Instead of using photolithography's separate steps of resist coating, exposure, development, and etching, the invention combines pattern definition and fluid deposition guidance into one wettability-variable layer that simultaneously performs both functions. This consolidation reduces the number of process steps while maintaining the ability to form fine patterns, directly addressing the contradiction between precision and process complexity.
Solution Approach 2:
The wettability-variable layer serves as an intermediary between the substrate and the functional fluid. This intermediate layer mediates the interaction by providing spatially varying surface energy that guides fluid deposition without requiring direct mechanical or chemical intervention. The intermediary layer translates energy input (UV, heat) into surface property changes that control fluid behavior, enabling fine pattern formation with fewer process steps compared to conventional photolithography.
3Manufacturing precision
If banks are formed to prevent functional fluid spread, then pattern uniformity is improved, but the process requires photolithography with many steps including resist coating, exposure, development, and etching
Solution Approach 1:
The patent applies inversion by reversing the conventional approach of using physical barriers (banks) to contain fluid. Instead of building structures to prevent spread, the invention uses surface energy modulation to actively guide fluid flow into desired regions. The wettability-variable layer creates hydrophilic pathways that naturally direct fluid deposition, eliminating the need for physical containment structures and the complex photolithography process required to manufacture them.
Solution Approach 2:
The patent replaces the mechanical system of physical banks and grooves with a chemical/physical field-based system using surface energy gradients. Instead of mechanically constructed barriers that require multi-step fabrication, the invention uses energy-induced surface property changes to control fluid behavior. This substitution eliminates mechanical containment structures and their associated manufacturing complexity while achieving equivalent or superior pattern uniformity.
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 method enables the formation of fine conductive patterns with widths as small as 10 μm, improving the quality of transistors and electronic displays by reducing fluid overflow and simplifying the process compared to conventional methods, which often require multiple steps like photolithography.
Implementation Method 1
a wettability-variable layer containing a wettability-variable material whose surface energy changes when energy is applied
Implementation Method 2
the functional fluid is jetted onto the first area and flows into the second area
Data Source
AI summary
A disclosed laminated structure includes a wettability-variable layer containing a wettability-variable material whose surface energy changes when energy is applied thereto and including at least a high-surface-energy area having high surface energy and a low-surface-energy area having low surface energy; and a conductive layer formed on the high-surface-energy area. The high-surface-energy area includes a first area and a second area extending from the first area and having a width smaller than that of the first area.