Imprint Apparatus Peeling Force Defect Detection
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Solution Overview
Problem
Conventional imprinting processes face challenges in detecting defects in fine patterns, particularly nano-sized patterns used in display devices, due to the limitations of traditional inspection methods which struggle to accurately identify defects in such small features.
Innovation Solution
An imprint apparatus and method that applies a material layer to a substrate, uses a stamp film with a corresponding pattern, and employs a pressure sensor to detect defects by monitoring the peeling force in real time, allowing for immediate identification and adjustment of the peeling speed to prevent further defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used to detect defects in fine patterns, then the inspection process is simple, but the measurement precision is insufficient for nano-sized patterns
Solution Approach 1:
The patent replaces conventional optical inspection methods with a mechanical sensing approach. A pressure sensor detects defects by measuring changes in peeling force during the stamp separation process. When the stamp is peeled from the cured material layer, defects in the patterned layer cause variations in adhesion force, which are detected by the pressure sensor. This mechanical detection method achieves high measurement precision for nano-sized patterns without requiring complex optical inspection systems.
2Manufacturing precision
If real-time defect detection is implemented during peeling, then the manufacturing precision is improved, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent implements real-time feedback by connecting a pressure sensor to the stamp mechanism. During the peeling process, the pressure sensor continuously monitors the peeling force and detects anomalies that indicate defects. The system provides immediate feedback about defect locations and characteristics, allowing for real-time quality control. This feedback mechanism is integrated into the existing imprint apparatus workflow, adding monitoring capability without fundamentally redesigning the entire system.
Solution Approach 2:
The imprint apparatus performs self-inspection during the normal peeling operation. The act of peeling the stamp from the cured material layer, which is already part of the manufacturing process, simultaneously serves as the inspection mechanism. The pressure sensor detects defects during this necessary peeling action, eliminating the need for separate inspection steps and reducing overall system complexity while maintaining high manufacturing precision.
3Manufacturing precision
If the peeling speed is reduced to prevent defects, then the manufacturing precision is improved, but the productivity decreases
Solution Approach 1:
The pressure sensor provides real-time feedback during the peeling process, allowing the system to dynamically adjust peeling speed based on detected conditions. When defects are detected or high-risk situations arise, the system can slow down to ensure quality. When no defects are present, the system maintains higher peeling speeds to maximize productivity. This adaptive speed control optimizes both manufacturing precision and throughput.
Solution Approach 2:
The system performs preliminary detection during the peeling process itself, identifying potential defects before they affect subsequent manufacturing steps. By detecting issues early during peeling rather than requiring slower processing speeds to prevent them, the system maintains high productivity while ensuring pattern quality through proactive defect identification.
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 effective detection and minimization of defects in fine patterns during the imprinting process, ensuring higher quality and accuracy in pattern formation for display devices.
Implementation Method 1
sensing the peeling force in real time by a pressure sensor connected to the pressure roller
Implementation Method 2
a tension roller which maintains tension of the fed stamp film constant
Implementation Method 3
The pressure roller may press the fed stamp film toward the material layer on the substrate by applying a pressing force to the fed stamp film
Data Source
AI summary
An imprint method includes: applying a applying a material for forming a patterned layer having a pattern, to a substrate; feeding a stamp film including a stamp pattern corresponding to the pattern of the patterned layer, along a pressure roller and an idle roller; forming the patterned layer having the pattern, including: the pressure roller pressing the stamp film toward the material to contact the stamp pattern of the stamp film with the material layer, curing the material layer in contact with the stamp pattern, and moving the pressure roller and the idle roller to peel the stamp film off the cured material layer by a peeling force, to form the patterned layer having the pattern; and detecting a defect in the formed patterned layer, during the peeling of the stamp film, by sensing the peeling force in real time by a pressure sensor connected to the pressure roller.