Ink-Jet Head Timing Control for Precise Pattern Printing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ink-jet printing technologies face challenges in ensuring reliable and efficient formation of patterns, particularly in display devices like OLEDs and LCDs, due to inconsistencies in ink ejection timing and lack of integrated inspection processes.
Innovation Solution
An ink-jet printing apparatus with an ink-jet head unit, control device, and pattern sensing unit that adjusts ink ejection timing based on pattern information comparison, allowing for alternating ejection and non-ejection sections with varying intervals, and integrates continuous printing and inspection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink ejection timing is not adjusted, then the printing process is simple and fast, but the pattern formation precision deteriorates due to timing inconsistencies
Solution Approach 1:
The control device receives second printing pattern information from the pattern sensing unit, compares it with first printing pattern information, and adjusts the ink ejection timing based on the comparison result. This feedback mechanism corrects timing deviations to improve pattern formation precision without requiring complex manual calibration.
Solution Approach 2:
The system performs preliminary comparison of printing pattern information before actual printing to determine appropriate ink ejection timing. By pre-calculating the timing adjustments based on pattern requirements, the system ensures precise pattern formation from the start without requiring complex real-time adjustments during printing.
2Productivity
If inspection process is separate from printing, then each process can be optimized independently, but the overall process efficiency deteriorates due to sequential processing
Solution Approach 1:
The ink-jet printing apparatus integrates both the printing function (ink-jet head unit) and inspection function (pattern sensing unit) into a single system. The control device coordinates both operations, allowing the inspection process to occur simultaneously with or immediately after printing without requiring separate equipment, thereby improving overall process efficiency.
Solution Approach 2:
The printing apparatus is designed to perform multiple functions: printing patterns and inspecting printed patterns. The control device manages both printing control and inspection coordination, making the system versatile and eliminating the need for separate dedicated inspection equipment, thus improving productivity.
3Adaptability or versatility
If fixed ink ejection intervals are used, then the control signal generation is simple, but the adaptability to different pattern requirements deteriorates
Solution Approach 1:
The control device dynamically adjusts the ink ejection timing based on the specific pattern requirements. Instead of using fixed intervals, the system generates control signals with variable timing that adapts to different pattern types, allowing the same apparatus to handle diverse printing requirements effectively.
Solution Approach 2:
The system changes the timing parameters of ink ejection control signals according to the specific printing pattern requirements. By adjusting parameters such as ejection intervals and timing offsets based on pattern information, the system achieves high adaptability to different pattern types while maintaining manageable control complexity through automated parameter adjustment.
Data Source
AI summary
An ink-jet printing apparatus includes an ink-jet head unit including an ink-jet head, and a control device which controls an ink ejection timing of the ink-jet head and includes a comparator comparing first printing pattern information that is stored and second printing pattern information that is input with each other, a control signal generator generating a first head control signal based on the first printing pattern information when a difference between the first printing pattern information and the second printing pattern information is a reference value or less and generating a second head control signal different from the first head control signal based on the second printing pattern information when the difference between the first printing pattern information and the second printing pattern information exceeds the reference value, and a data output unit providing the first head control signal or the second head control signal to the ink-jet head unit.