Inkjet Nozzle Discharge Correction via Lookup Table
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inkjet printing methods face challenges in ensuring uniform discharge volume of droplets to pixel areas, leading to potential stains like mura due to measurement errors in nozzle discharge volume.
Innovation Solution
An inkjet printing method that generates an initial sequence of numbers, corrects these numbers with a correction sequence based on a variable range for droplet volume and a measurement error range for nozzle discharge volume, and adjusts the discharge volume for each nozzle accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement is performed to determine discharge volume of nozzles, then discharge volume can be controlled, but measurement errors occur leading to non-uniform droplet discharge
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for each nozzle based on measured discharge volume deviations before actual printing. These correction values are stored in a lookup table and applied during printing to compensate for measurement errors, ensuring uniform droplet discharge without requiring continuous real-time correction.
Solution Approach 2:
The patent implements feedback by measuring the actual discharge volume of each nozzle, comparing it to the target value, calculating correction values based on the deviation, and using these corrections to adjust subsequent droplet discharge. This closed-loop approach ensures that measurement errors are compensated and uniformity is achieved.
2Reliability
If correction values are applied to compensate for measurement errors, then discharge uniformity improves, but process complexity increases
Solution Approach 1:
The patent reduces complexity by performing all correction value calculations in advance during a characterization phase, then storing them in a lookup table. During actual printing, the system simply retrieves pre-calculated correction values, eliminating the need for complex real-time calculations and reducing processing complexity.
Solution Approach 2:
The patent creates a lookup table that copies and stores pre-calculated correction values for each nozzle. This allows the system to retrieve correction data without performing complex calculations during printing, simplifying the real-time process while maintaining correction accuracy.
Data Source
AI summary
An inkjet printing method includes generating an initial sequence in which initial numbers are arranged in a matrix form, generating a correction sequence by correcting the initial numbers with correction numbers based on a variable range for a volume of droplets ejected into pixel areas and measurement error range for discharge volume of nozzles which discharge droplets to the pixel areas, and discharging droplets to the pixel areas while adjusting a discharge volume for each nozzle based on the correction sequence.