Nozzle Inspection via Inkjet Droplet Patterns
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Solution Overview
Problem
Conventional inkjet head inspection methods are time-consuming and lack accuracy in detecting defects in nozzles, which can lead to printing defects in display devices.
Innovation Solution
A nozzle inspection method and apparatus that discharge multiple droplets into a region of interest on a substrate to form an inspection pattern, using an inkjet head module and vision module to determine nozzle defects based on the pattern formed, allowing for rapid and accurate defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inkjet head inspection methods are used, then the inspection process is simple, but the inspection time is long and defect detection accuracy is low
Solution Approach 1:
The patent applies preliminary action by pre-forming an inspection pattern on the substrate before actual printing. This inspection pattern includes multiple droplets discharged from each nozzle into a designated region, allowing defect detection to be performed in advance. By preparing this reference pattern beforehand, the system can quickly compare actual printing results against it, significantly reducing inspection time while maintaining high defect detection accuracy.
Solution Approach 2:
The patent uses copying by creating a reference inspection pattern that replicates the expected normal printing output. This reference pattern serves as a template or copy of what correct nozzle performance should look like. During inspection, the actual printing output is compared against this copied reference pattern, enabling rapid and accurate defect detection without requiring complex real-time analysis of each printed element.
2Measurement precision
If multiple droplets are discharged into a region of interest to form an inspection pattern, then defect detection accuracy is enhanced, but the inspection process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the inspection process into distinct functional modules: a droplet discharging unit that forms the inspection pattern, a photographing unit that captures the pattern, and a determining unit that analyzes the captured image. This segmentation allows each module to perform its specific function efficiently, reducing overall process complexity despite the detailed nature of the inspection pattern.
Solution Approach 2:
The patent uses an intermediary approach by introducing a dedicated photographing unit that captures the inspection pattern as an intermediate step between droplet discharge and defect analysis. This intermediary imaging step converts the physical droplet pattern into a digital image that can be easily processed and analyzed, simplifying the overall inspection process while maintaining high detection accuracy.
3Reliability
If frequent nozzle inspection is performed, then printing defects are prevented, but production time is reduced
Solution Approach 1:
The patent enables frequent and rapid inspection by pre-forming inspection patterns and using quick capture-compare methods. The inspection pattern is created once and can be reused for multiple comparisons, allowing frequent verification of nozzle performance without significant time penalty. This maintains high printing quality through regular inspection while minimizing impact on production throughput.
Solution Approach 2:
The patent replaces complex mechanical inspection systems with a streamlined optical and computational approach. Instead of using elaborate mechanical measurement devices, the system uses a photographing unit to capture images and a determining unit to perform digital comparison against the reference pattern. This substitution dramatically reduces inspection time, allowing frequent checks that maintain printing reliability without sacrificing production efficiency.
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 significantly reduces inspection time while enhancing accuracy by forming and analyzing inspection patterns, enabling timely detection of nozzle defects and preventing printing defects.
Implementation Method 1
an inkjet head module and a vision module, wherein the inkjet head module forms an inspection pattern by discharging a plurality of droplets into a first region of interest of a substrate
Implementation Method 2
a vision module disposed on the stage and for photographing the inspection pattern
Data Source
AI summary
Provided are a nozzle inspection method and a nozzle inspection apparatus capable of accurately detecting a defect in an inkjet head nozzle within a short time. The nozzle inspection method comprises discharging a plurality of droplets into a first region of interest of a substrate using a first nozzle to form an inspection pattern, and determining whether the first nozzle is defective based on the inspection pattern.