Viscosity Control for Inkjet Alignment Agent Jetting
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Solution Overview
Problem
The inkjet process for forming alignment layers in liquid crystal displays faces issues with diffusion and staining due to the low viscosity of the alignment agent, leading to aggregation at the edge portions of the substrate.
Innovation Solution
An apparatus with a jetting head and a viscosity controlling part that heats the alignment agent to lower its viscosity before jetting, allowing for smooth deposition and preventing subsequent aggregation, thereby improving jetting efficiency and reducing staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the alignment agent viscosity is reduced to improve jetting performance in the inkjet process, then jetting efficiency is improved, but diffusion of the alignment layer increases causing aggregation at edge portions and staining
Solution Approach 1:
The patent applies preliminary action by heating the alignment agent before jetting to reduce its viscosity, enabling smooth jetting through the inkjet head. The viscosity controlling part heats the alignment agent in advance, so that when the agent is jetted, it has already achieved the optimal viscosity for jetting performance, thus improving jetting efficiency without causing subsequent diffusion and staining issues
Solution Approach 2:
The patent applies parameter changes by dynamically controlling the viscosity parameter of the alignment agent through temperature adjustment. The viscosity controlling part changes the temperature parameter of the alignment agent, which directly affects its viscosity, allowing the system to optimize jetting performance by maintaining the alignment agent at an appropriate viscosity level during the jetting process
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
The apparatus ensures efficient jetting of the alignment agent with controlled viscosity, preventing edge staining and enhancing the formation of uniform alignment layers in liquid crystal displays.
Implementation Method 1
a viscosity controlling part controlling a viscosity of the alignment agent stored in the jetting head to facilitate jetting of the alignment agent
Implementation Method 2
The jetting head heats the alignment agent to a specific temperature to control the viscosity of the alignment agent, thereby facilitating jetting of the alignment agent
Implementation Method 3
a piezo-electric part disposed in the storage space to extrude the alignment agent towards the jetting hole onto a substrate
Data Source
AI summary
An apparatus for jetting an alignment agent includes a jetting head having a jetting hole, an alignment agent externally provided onto a substrate and a viscosity controlling part controlling a viscosity of the alignment agent stored in the jetting head to facilitate jetting of the alignment agent. The alignment agent is jetted to the substrate through the jetting hole. The apparatus improves the efficiency of jetting the alignment agent.