Ejection Head Sensor for High-Viscosity Ink Dispensing
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Solution Overview
Problem
Existing display device manufacturing processes face challenges in accurately dispensing high-viscosity ink and preventing ink overflow, particularly during the manufacturing of display devices like OLEDs and LEDs.
Innovation Solution
The apparatus includes an ejection head with a detection sensor interposed between the nozzle tip and the first housing, which surrounds the nozzle tip. This setup allows for precise control of ink ejection and prevents overflow by detecting contact status and intensity of the nozzle tip with the target substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional ejection head is used for dispensing high-viscosity ink, then the ink can be dispensed, but ink overflow occurs and dispensing accuracy deteriorates
Solution Approach 1:
A detection sensor is integrated into the ejection head to detect the contact status between the nozzle tip and the substrate in real-time. This feedback mechanism allows the system to monitor dispensing conditions and adjust parameters to prevent ink overflow while maintaining accurate dispensing of high-viscosity ink.
Solution Approach 2:
The patent replaces conventional mechanical dispensing control with a sensor-based detection and control system. The detection sensor substitutes pure mechanical feedback with electronic sensing, enabling more precise control over the dispensing process and preventing ink overflow through automated adjustment.
2Manufacturing precision
If the nozzle tip is positioned close to the substrate for accurate dispensing, then dispensing precision improves, but the risk of ink overflow and contact damage increases
Solution Approach 1:
The detection sensor provides real-time feedback on the contact status between the nozzle tip and substrate, allowing the control system to maintain optimal positioning for precision dispensing while immediately detecting and responding to contact conditions that could damage the nozzle tip or cause ink overflow.
Solution Approach 2:
The detection sensor is positioned to detect contact status before actual contact occurs or at the moment of contact, allowing the system to take preliminary protective actions to prevent nozzle tip damage and ink overflow while maintaining the close positioning necessary for precise dispensing.
3Measurement precision
If conventional sensors are used to detect nozzle contact, then contact detection is possible, but the detection precision and response accuracy are insufficient
Solution Approach 1:
The detection sensor is merged directly into the ejection head structure, integrating the sensing function with the dispensing mechanism. This integration eliminates signal transmission delays and provides immediate, high-precision contact detection, ensuring both accurate measurement and rapid response.
Solution Approach 2:
The detection sensor acts as an intermediary between the nozzle tip and the control system, providing high-precision contact status information that enables rapid and accurate control adjustments without the delays associated with conventional sensing methods.
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
The apparatus effectively manages high-viscosity ink dispensing, ensuring accurate and controlled ejection, thereby enhancing the manufacturing efficiency and quality of display devices.
Implementation Method 1
the detection sensor includes a first electrode, a second electrode, and a piezoelectric body disposed between the first and second electrodes
Data Source
AI summary
An apparatus for manufacturing a display device includes: a stage; an ejection head overlapping the stage, wherein the ejection head includes a main body part and a nozzle part, wherein the main body part houses ink, and the nozzle part includes a nozzle tip and a first housing surrounding the nozzle tip; and a detection sensor interposed between the nozzle tip and the first housing.