Inkjet Print Head Nozzle Array Density Correction
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Solution Overview
Problem
Inkjet printing systems face challenges with print density fluctuations at the joint portions of overlapping nozzle arrays due to misalignment of chip positions, leading to defects like white or black lines in the printed image, which existing methods struggle to fully correct without significant adjustments to image data or nozzle coverage.
Innovation Solution
An inkjet printing apparatus and method that corrects print density at the joint portions by adjusting the positional deviation of adjacent nozzle arrays, using a correction unit to ensure accurate ink landing positions and employing a density correction table to optimize print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple chips are arranged to overlap at the ends of adjacent chips with complementary print density adjustment, then printing continuity is improved, but density fluctuation occurs when misalignment happens
Solution Approach 1:
The patent changes the printing duty ratio parameter dynamically based on the overlap amount between adjacent chips. By adjusting the printing duty ratio according to the actual overlap degree, the system compensates for misalignment and maintains consistent print density across chip boundaries, resolving the contradiction between printing continuity and density accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the overlap amount between chips is detected and used to adjust the printing duty ratio. This closed-loop control ensures that even when misalignment occurs, the system can compensate by modifying printing parameters, thereby maintaining both printing continuity and density accuracy
2Manufacturing precision
If chip positions are shifted to resolve misalignment, then print position accuracy is improved, but image data must be shifted for each pixel which increases processing complexity
Solution Approach 1:
Instead of shifting the entire image data globally, the patent applies local quality adjustment by modifying printing duty ratios only in the overlap regions of adjacent chips. This localized approach corrects position accuracy issues without requiring complex global image data transformation
Solution Approach 2:
The patent changes printing parameters (duty ratio) locally in overlap regions rather than shifting image data globally. This parameter-based correction achieves position accuracy improvement with minimal processing complexity
3Reliability
If nozzle arrays are overlapped to cover misalignment, then printing reliability is improved, but print density control at joint portions becomes difficult
Solution Approach 1:
The patent dynamically adjusts the printing duty ratio parameter based on the overlap amount between nozzle arrays. This parameter change enables the system to maintain reliable printing coverage while precisely controlling print density at joint portions by compensating for the overlap degree
Data Source
AI summary
An inkjet printing apparatus, an inkjet printing system and an inkjet printing method are provided in order to correct a print density at a joint (overlapped portion) of nozzle arrays of a print head. The print density at the joint (overlapped portion) of the nozzle arrays is corrected based on a positional deviation between two adjacent nozzle arrays of the print head.