Inkjet Nozzle Recipe Selection for Uniform Display Printing
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Solution Overview
Problem
Inkjet printing technologies face challenges in maintaining uniform particle concentration across nozzles, leading to non-uniform ink discharge and reduced printing quality in display device manufacturing, particularly in forming organic and inorganic light emitting diodes.
Innovation Solution
A method involving the measurement of liquid drop volume and concentration for each nozzle, selection of optimal nozzle groups, and a printing simulation to achieve target volume and concentration, ensuring uniform ink distribution and quality through the use of an inkjet printing apparatus with a light irradiating device, sensing device, and processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inkjet printing is performed using conventional nozzles, then printing process is simple, but particle concentration becomes non-uniform causing precipitation and reduced printing quality
Solution Approach 1:
The patent performs preliminary measurement of liquid drop volume and concentration for each nozzle before printing, and pre-selects optimal nozzle groups based on these measurements. This preliminary characterization allows the system to compensate for nozzle variations during printing, achieving uniform particle concentration without requiring complex real-time control mechanisms.
Solution Approach 2:
The patent implements a feedback mechanism where measurement data from each nozzle (volume and concentration) is used to determine optimal nozzle group selections. The system uses this feedback information to adjust printing parameters and select recipes that compensate for individual nozzle variations, ensuring consistent particle concentration across all nozzles.
2Manufacturing precision
If ink discharge volume varies across nozzles, then printing speed is maintained, but ink distribution uniformity deteriorates leading to stains and brightness variations
Solution Approach 1:
The patent applies local quality by measuring and characterizing each individual nozzle's liquid drop volume and concentration properties. Based on these local measurements, the system selectively groups nozzles with similar characteristics together, ensuring that each nozzle operates within its optimal performance range. This localized approach maintains printing speed while achieving uniform ink distribution across the entire print head.
Solution Approach 2:
The patent changes operational parameters by selecting different nozzle groups for different printing tasks based on measured characteristics. The system adjusts which nozzles are activated in each group to optimize ink distribution uniformity while maintaining overall printing speed. This dynamic parameter selection compensates for nozzle-to-nozzle variations without requiring reduction in printing velocity.
3Manufacturing precision
If particles precipitate in the ink solution, then material is wasted, but printing quality and brightness uniformity are reduced
Solution Approach 1:
The patent performs preliminary measurement of particle concentration in the liquid drop for each nozzle before printing. By characterizing the ink solution properties in advance, the system can identify and compensate for nozzles that are prone to particle precipitation. This allows optimal nozzle group selection that prevents precipitation-related defects while maximizing ink material utilization.
Solution Approach 2:
The patent uses feedback from concentration measurements to adjust nozzle group selection and printing parameters. The system monitors particle concentration characteristics and selects recipes and nozzle groups that minimize precipitation risks, thereby preventing brightness uniformity issues and maximizing the effective use of ink material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents particle precipitation and enhances printing quality by ensuring consistent ink discharge, improving the uniformity of brightness and reducing stains, thereby improving both printing and display device performance.
Implementation Method 1
the light irradiating device may irradiate light onto the liquid drop of the ink, and the sensing device may sense brightness of light passing through the liquid drop of the ink
Data Source
AI summary
A method for inkjet printing includes setting a target volume and a target concentration of ink discharged to a pixel, measuring a volume and a concentration of a liquid drop for each of nozzles, selecting first nozzle groups for achieving the target volume, from a volume pool of the liquid drop for each of the nozzles, selecting second nozzle groups for achieving the target concentration, from the first nozzle groups, selecting recipes by combining brightness trend lines, from the second nozzle groups, performing a printing simulation for each of the recipes to select a final recipe, and performing inkjet printing by using the final recipe.