Roller Nano-Imprinting Apparatus for Large-Area Lithography
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Solution Overview
Problem
Current nano-imprint lithography techniques are limited to small areas and are not suitable for large-scale production due to the need for repetitive processes and inability to handle continuous structures larger than the template size, making them inefficient and costly for manufacturing micro or nanometer-scale structures on large substrates.
Innovation Solution
A nano-imprinting apparatus and method utilizing two rotatably mounted rollers with synchronized rotation and adjustable pressure to transfer patterns to substrates, allowing for efficient imprinting of large areas in a single step, with integrated heating and cooling mechanisms to manage substrate material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional nano-imprint lithography uses a template with rigid body and flexure members, then the template can be supported and controlled for precise positioning, but the system cannot handle large area substrates in a single imprint step
Solution Approach 1:
The invention divides the imprinting process into two independent rotatable rollers, each responsible for a portion of the substrate. The first roller applies the pattern while the second roller provides support and pressure, allowing continuous processing of large area substrates without requiring a single large template
Solution Approach 2:
The invention transitions from a planar template approach to a cylindrical roller approach, utilizing the rotational dimension to achieve continuous imprinting. This allows the pattern to be applied along the length of the substrate as it passes between the rollers, enabling handling of substrates larger than the template area
2Manufacturing precision
If step and flash imprint lithography uses a template image area of about 25mm x 25 mm, then the template can be controlled precisely, but continuous structures larger than template size cannot be produced
Solution Approach 1:
The invention enables continuous imprinting as the substrate passes between the two rotatable rollers. The pattern application continues without interruption along the length of the substrate, allowing production of continuous structures much longer than the template area while maintaining precision through controlled roller rotation and pressure
3Adaptability or versatility
If traditional nano-imprint lithography requires repetitive processes for large substrates, then the template can be reused, but the process becomes time-consuming and less optimum for large-scale production
Solution Approach 1:
The invention eliminates repetitive lifting and repositioning operations by using continuous roller rotation. The substrate continuously passes between the rollers and is imprinted in a single continuous motion, dramatically reducing processing time compared to discrete repetitive steps while maintaining template reusability
4Manufacturing precision
If nano-imprint lithography uses heating to soften the moldable layer, then the pattern can be transferred effectively, but the process requires precise temperature control
Solution Approach 1:
The invention uses temperature as a key parameter to control the state of the moldable layer. By controlling the temperature during the imprinting process, the material transitions from a hard state to a softened state, enabling effective pattern transfer without requiring complex mechanical adjustment systems
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
Enables high-throughput, single-step nano-imprinting on large substrates, such as continuous thin films or foils, facilitating the production of micro or nanometer-scale structures on areas exceeding 400x600 mm, thus optimizing the production of fine structure devices for applications like full flat panel displays.
Implementation Method 1
The stamp is brought into contact with the moldable layer, and the layer is softened, preferably by heating
Implementation Method 2
The layer is cooled down until it hardens to a satisfactory degree
Data Source
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AI summary
An apparatus and a method in connection with the lithography of structures on a micro or nanometer scale. A nano-imprinting apparatus according to an embodiment of the invention comprises two rotatably mounted rollers for transferring a pattern of micro or nanometer size to the substrate to be patterned. A first rotatably mounted roller has a patterned circumferential surface for transferring a pattern from the first rotatably mounted roller to a deformable substrate by contacting the patterned surface with the substrate. A second rotatably mounted roller has a principally smooth circumferential surface which faces the patterned surface of the first rotatably mounted roller. Furthermore, the second rotatably mounted roller is rotatably coupled with the first rotatably mounted roller for synchronized rotation of the first and second rollers. The substrate is movable between the first and second rollers such that, when these rollers rotate with respect to each other, the patterned surface of the first rotatably mounted roller comes into contact with the substrate whereby this pattern is transferred from the patterned surface to the substrate.