Droplet Analysis Unit Using Chromatic Aberration for 3D Meniscus Measurement
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Solution Overview
Problem
Existing inkjet systems struggle to accurately measure and quantify the meniscus shape, motion, and position of ink droplets, leading to inconsistent ejection and defects in display device fabrication.
Innovation Solution
A droplet analysis unit that utilizes chromatic aberration to measure and digitize the 3D information of meniscus shape, motion, and position, incorporating modules for image acquisition, transmittance measurement, cleaning, and light detection to provide precise quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a drop watcher system is used to measure meniscus motion, then the system can capture images of ink droplets, but it cannot accurately measure the shape, motion, and position of the meniscus
Solution Approach 1:
The patent replaces the conventional optical imaging system with a laser-based measurement system. Instead of using a camera to capture images and infer meniscus properties, the invention uses laser beams to directly measure the position, shape, and motion of the meniscus through optical reflection and interference principles, achieving precise quantitative measurement
Solution Approach 2:
The patent changes the measurement parameter from qualitative image analysis to quantitative laser measurement parameters. By using laser wavelength, reflection angles, and interference patterns as measurement parameters, the system can precisely determine meniscus position, curvature radius, and motion velocity
2Reliability
If conventional imaging methods are used, then the system structure is simple, but the ejection characteristics cannot be improved due to insufficient measurement capability
Solution Approach 1:
The patent introduces a laser measurement system with specific optical components including laser sources, beam splitters, and position-sensitive detectors. This replacement of conventional imaging with laser-based measurement enables precise feedback for controlling ink ejection characteristics
Solution Approach 2:
The patent implements a feedback mechanism where the laser measurement system continuously monitors meniscus position and shape, and this information is fed back to control the inkjet head operation. This closed-loop feedback ensures consistent ejection characteristics by adjusting parameters based on real-time meniscus measurements
Data Source
AI summary
A droplet analysis unit capable of measuring and digitizing the meniscus shape, motion, and position of ink droplets and a substrate treatment apparatus including the droplet analysis unit are provided. The substrate treatment apparatus includes: a process treatment unit supporting a substrate while the substrate is being treated; an inkjet head unit treating the substrate by ejecting a substrate treatment liquid onto the substrate using a plurality of nozzles; a gantry unit moving the inkjet head unit over the substrate; and a droplet analysis unit measuring a meniscus in each of the nozzles that is associated with the substrate treatment liquid, wherein the droplet analysis unit measures and quantifies three-dimensional (3D) information regarding the meniscus based on chromatic aberration.