Screen Printing Pressure Feedback for OLED Alignment
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Solution Overview
Problem
In screen printing for OLEDs, the deformation of metal printing screens due to gravity leads to uneven pressure application, resulting in printing offsets and reduced alignment accuracy, which affects the subsequent bonding and laser sintering processes, particularly for narrow-bezel products with high accuracy requirements.
Innovation Solution
A screen printing method and apparatus featuring a pressure sensing feedback system that adjusts the pressure between the printing scraper and screen, using a scraper driving device to move the scraper along different axes, ensuring consistent pressure application and compensating for screen deformation, thereby reducing printing offsets and improving alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the printing screen is used during screen printing, then the printing process can be completed, but the metal printing screen deforms due to gravity causing uneven pressure application
Solution Approach 1:
The patent implements a pressure sensing feedback system that detects the actual pressure distribution between the scraper and printing screen in real-time, compares it with the target pressure, and automatically adjusts the scraper position or force to compensate for screen deformation. This closed-loop feedback mechanism ensures uniform pressure application despite gravity-induced screen deformation.
Solution Approach 2:
The patent dynamically changes the pressure parameters applied by the scraper based on detected screen deformation. The system adjusts pressure distribution across different regions of the printing screen to compensate for gravitational deformation, transforming a static printing process into a dynamically adapted one that maintains printing accuracy.
2Manufacturing precision
If the pressure between the printing scraper and printing screen is increased to improve printing quality, then the printing accuracy improves, but the_scraper wear and energy consumption increase
Solution Approach 1:
The patent applies pressure locally and selectively based on the actual printing needs and screen deformation characteristics. Rather than applying uniform high pressure across the entire printing screen, the system adjusts pressure distribution to match the specific requirements of different printing regions, reducing overall energy consumption while maintaining printing accuracy where needed.
Solution Approach 2:
The pressure sensing feedback system monitors actual pressure application and adjusts scraper force dynamically, applying minimum necessary pressure to achieve printing accuracy. This prevents excessive energy consumption while maintaining quality standards.
3Device complexity
If the printing scraper applies constant pressure during the entire printing process, then the printing process is simple, but printing offsets occur due to screen deformation
Solution Approach 1:
The patent introduces a pressure sensing feedback system that continuously monitors pressure distribution and screen position, automatically compensating for deformation-induced printing offsets. This feedback mechanism maintains high alignment accuracy without requiring complex manual intervention or overly complicated mechanical structures.
Solution Approach 2:
The system performs self-adjustment through automated feedback control, where the printing apparatus monitors and corrects its own performance in real-time. This self-service capability maintains printing accuracy without requiring external intervention or excessively complex control systems.
Data Source
Figure 1~2
AI summary
A printing screen method includes: providing at least one printing scraper assembly, wherein the printing scraper assembly has a printing scraper and a pressure sensing feedback system; placing at least one printing screen on a substrate; detecting and supplying a pressure value between the printing scraper and the printing screen during printing by the pressure sensing feedback system; and comparing the supplied pressure value and a predetermined pressure value, and changing the pressure between the printing scraper and the printing screen if a difference between the feedback pressure value and the predetermined pressure value is larger than a predetermined threshold. An imprinting apparatus implementing the printing screen method is also provided.