Inkjet Assembly Gas-Liquid Microfluidics High-Speed Printing
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Solution Overview
Problem
Existing inkjet printing apparatuses for display components face challenges in achieving high-speed inkjet printing due to the fluid's inertia and low response speed, leading to ink deposition on banks between pixel cells, affecting yield.
Innovation Solution
The inkjet assembly incorporates a jet printing member with a main inkjet channel, a liquid-phase channel, and a gas-phase channel, where the liquid-phase and gas-phase fluids are introduced to form end-to-end microfluidics, allowing for alternate emission of droplets and dynamic shutdown during high-speed movements, preventing ink deposition on banks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional inkjet printing is used with solution method, then high precision can be achieved, but high speed requirement cannot be met due to fluid inertia and low response speed
Solution Approach 1:
The patent implements dynamic control of the inkjet system by adjusting the ejection frequency and timing of ink droplets based on real-time printing requirements. The system can dynamically start and stop inkjet ejection to match the high-speed movement of the display component, ensuring ink is deposited only when needed and preventing ink from falling on banks during transitions.
Solution Approach 2:
The patent changes the physical parameters of the inkjet system by using a gas-liquid two-phase flow mechanism. Gas is introduced into the inkjet channel to create alternating gas-liquid droplets, which reduces the effective mass and inertia of the ejected material. This parameter change enables faster response time and more precise control over ink deposition, meeting both high speed and high precision requirements.
2Productivity
If gas-liquid two-phase flow is used to increase speed, then high speed printing is achieved, but system complexity increases
Solution Approach 1:
The patent merges the gas supply system with the existing inkjet channel structure. The gas channel and liquid ink channel are integrated into a unified microfluidic system where gas and liquid flow through interconnected channels. This merging approach introduces gas-liquid two-phase flow functionality without requiring entirely separate systems, thus improving productivity while limiting the increase in overall device complexity.
Solution Approach 2:
The patent adds a gas phase dimension to the traditional single-phase liquid inkjet system. By introducing gas flow through additional channels that intersect with the liquid channel, the system transforms from one-dimensional liquid flow to three-dimensional gas-liquid two-phase flow. This dimensional expansion enables new flow patterns and control mechanisms that enhance printing efficiency without proportionally increasing complexity.
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 solution enables high-precision, high-speed inkjet printing by ensuring real-time dynamic shutdown and precise ink placement, meeting the requirements of high-speed production while maintaining precision and efficiency.
Implementation Method 1
introduces a gas-phase fluid into the gas-phase channel and a liquid-phase fluid into the liquid-phase channel; the gas-phase fluid and the liquid-phase fluid form end-to-end microfluidics in the main inkjet channel
Implementation Method 2
emitting droplets of the liquid-phase fluid and the gas-phase fluid alternately
Data Source
AI summary
The present disclosure provides an inkjet assembly, an inkjet printing apparatus and an inkjet printing method for use in preparation of a display component. The inkjet assembly is for use in an inkjet printing apparatus, including a jet printing member having a first surface. A main inkjet channel, a liquid-phase channel in communication with the main inkjet channel, and a gas-phase channel in communication with the main inkjet channel are formed in the jet printing member. An axial direction of the liquid-phase channel intersects an axial direction of the main inkjet channel, and an axial direction of the gas-phase channel intersects the axial direction of the main inkjet channel. An end opening of the main inkjet channel is formed as a nozzle on the first surface.