Display Inkjet Nozzle Calibration for Precise Ink Placement
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Solution Overview
Problem
Existing inkjet printing technologies for display devices fail to accurately control ink discharge at the nozzle level, leading to imprecise pattern printing due to unaddressed errors in individual nozzles.
Innovation Solution
An apparatus and method that includes a control unit to adjust ink discharge timing and position for each nozzle based on image information, calculating injection errors and adjusting nozzle operations to ensure precise ink placement on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional inkjet printing is used without individual nozzle control, then the printing process is simple and fast, but the manufacturing precision of ink placement is poor
Solution Approach 1:
The patent divides the inkjet nozzle system into individually controllable units, where each nozzle can be controlled separately based on its specific characteristics. This segmentation allows precise control of ink placement for each nozzle while maintaining overall system functionality, resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent adjusts printing parameters such as discharge timing and position for each individual nozzle based on measured injection errors. By changing these parameters dynamically for each nozzle, the system achieves high manufacturing precision without requiring complete system redesign, thus managing device complexity.
2Measurement precision
If individual nozzle error correction is implemented, then the pattern printing accuracy is improved, but the measurement and control complexity increases
Solution Approach 1:
The patent uses a test substrate to create test patterns that copy the nozzle injection characteristics. By measuring the actual ink placement on this test substrate, the system can detect injection errors for each nozzle without requiring complex direct measurement of the nozzles themselves, thus reducing measurement difficulty while maintaining precision.
Solution Approach 2:
The patent implements a feedback mechanism where measured injection errors from test patterns are used to adjust printing parameters for each nozzle. This feedback loop enables continuous improvement of measurement and control accuracy while managing the complexity through automated parameter adjustment based on measured data.
Data Source
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AI summary
Provided are an apparatus and a method for manufacturing a display device. The apparatus (1) includes an ink discharging unit (15) configured to move in a first direction and including a head unit (151) including a plurality of nozzles spaced apart from each other and configured to discharge ink on a substrate (DS) and a film member (133), wherein the ink is discharged through at least one nozzle unit including a plurality of columns, an inspection unit (13) including a film member including a same material as the substrate, a camera unit (16) configured to obtain first image information about the ink discharged on the film member, and a moving unit (17) configured to move the ink discharging unit and the camera unit in the first direction, wherein at least two nozzles to discharge ink are selected from among the plurality of nozzles based on the first image information.