Roll Stamp Imprint Lithography for Large Flexible Substrates
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Solution Overview
Problem
Existing imprint lithography technologies face challenges in achieving stable and efficient pattern transfer on large-sized or flexible substrates, particularly in reducing residual layer thickness and ensuring uniform contact and pressure during the process.
Innovation Solution
The apparatus and method for liquid transfer imprint lithography using a roll stamp with a hollow cylindrical roll unit, angular compensating stage, and integrated hardening or curing elements, allowing for precise alignment, rotation, and contact with substrates to transfer patterns effectively, utilizing a control unit to manage the process and ensure consistent curing or hardening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If liquid transfer imprint lithography is applied to decrease residual layer thickness, then residual layer thickness is reduced, but the method is limited to small surfaces and hard to apply to large-sized or flexible substrates
Solution Approach 1:
The invention employs a cylindrical roll stamp instead of a planar stamp, allowing continuous wrapping around large or flexible substrates. This curved geometry enables the stamp to conform to various substrate shapes and sizes, maintaining effective contact area while reducing residual layer thickness through the liquid transfer mechanism.
Solution Approach 2:
The system integrates multiple functional components within a compact configuration: the roll stamp contains patterned surfaces, the apparatus includes alignment mechanisms, curing elements, and substrate handling systems all coordinated within a unified structure that enables complex operations in a space-efficient manner.
2Productivity
If a roll type stamp is used for continuous line contact transfer, then transfer speed and cost are improved, but stable and effective imprint lithography is difficult to achieve
Solution Approach 1:
The apparatus incorporates alignment mechanisms that continuously monitor and adjust the position of the roll stamp relative to the substrate during rotation, ensuring consistent pattern placement and contact pressure throughout the continuous transfer process, thereby maintaining reliability while achieving high productivity.
Solution Approach 2:
The system uses a rotating roll stamp that can be dynamically controlled in terms of speed, position, and pressure application. This dynamic control allows the stamp to adapt to different substrate conditions and maintain optimal imprinting parameters throughout the continuous process, ensuring both speed and stability.
3Manufacturing precision
If the position of the master roll is corrected in patterning, then contact surface uniformity and pressure distribution are improved, but the process complexity increases
Solution Approach 1:
The roll stamp design allows the patterned surface to self-align with the substrate through the liquid transfer mechanism, where the liquid resist naturally distributes the contact pressure uniformly across the pattern area, reducing the need for complex external position correction mechanisms while maintaining manufacturing precision.
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 stable and precise nano imprinting on large-sized or flexible substrates by ensuring continuous line contact and accurate alignment, reducing residual layer thickness and enhancing the efficiency of pattern transfer and curing processes.
Implementation Method 1
the pattern of the stamp is transferred to the resist at the same time when the resist is cured or hardened by heating or irradiating of ultraviolet ray
Implementation Method 2
the resist is cured or hardened by heating or irradiating of ultraviolet ray
Data Source
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AI summary
In an apparatus and a method for liquid transfer imprint lithography, the apparatus includes a roll unit, a plane unit and a control unit. The roll unit includes a roll stamp, a horizontal moving stage, a roll angular compensating stage and a roll rotating part. The plane unit is disposed under the roll unit and includes a first substrate, a first fixing chuck, a first substrate driving part, a second substrate, a second fixing chuck and a second substrate driving part. The control unit controls an operation of the roll unit and the plane unit.