Liquid Crystal Alignment Film Laser Patterning for Roll-to-Roll Production
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Solution Overview
Problem
The existing methods for manufacturing liquid crystal aligning films face challenges such as inefficiency, environmental concerns, and high costs due to the use of organic solvents in wet etching processes, which hinder compatibility with roll-to-roll continuous processes and result in inadequate adhesion and durability, especially in high-temperature and high-humidity environments.
Innovation Solution
A method involving a multilayer structure with a substrate, conductive layer, liquid crystal alignment layer, and passivation film, where pulse laser etching is used to selectively remove the liquid crystal alignment layer without damaging the conductive layer, allowing for the exposure of the conductive layer and minimizing residue, thus enhancing adhesion and durability while being environmentally friendly and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wet etching with organic solvent is used to remove the liquid crystal alignment layer, then the alignment layer can be selectively removed, but the process efficiency decreases and environmental problems arise
Solution Approach 1:
The patent replaces the chemical wet etching process with a mechanical/physical laser processing system. The laser beam directly ablates the alignment layer without requiring chemical solvents, thereby eliminating the environmental problems and efficiency losses associated with solvent evaporation and handling while maintaining precise selective removal capability.
Solution Approach 2:
The patent changes the processing parameter from chemical concentration and temperature control in wet etching to laser power, pulse duration, and scanning speed parameters. This parameter transformation enables a more efficient and environmentally friendly process while achieving the same selective removal effect.
2Manufacturing precision
If photolithography or other patterning processes are used to form the alignment layer, then the alignment layer can be precisely formed, but the manufacturing cost increases and compatibility with roll-to-roll process decreases
Solution Approach 1:
The patent replaces complex photolithography equipment and multiple chemical processing steps with a simpler laser direct writing system. This substitution reduces manufacturing cost and eliminates the need for photoresist materials, developing stations, and rinsing processes, making the method compatible with roll-to-roll continuous manufacturing.
Solution Approach 2:
The patent performs the alignment layer formation and patterning in a single preliminary laser step before device assembly, eliminating the need for subsequent alignment adjustments or additional processing steps. This preliminary action simplifies the overall manufacturing process and improves compatibility with continuous production methods.
3Strength
If the liquid crystal alignment layer is removed to expose the conductive layer, then adhesion with sealant improves, but the conductive layer may be damaged by conventional methods
Solution Approach 1:
The patent uses laser processing to selectively remove the alignment layer with precise control over depth and lateral dimensions. This mechanical/physical removal method stops exactly at the conductive layer interface without the chemical etching damage or mechanical stress that could compromise the conductive layer integrity, while still exposing sufficient surface area for sealant adhesion.
Solution Approach 2:
The patent applies laser processing only to the specific regions where alignment layer removal is needed, with precise control over the treated area. This localized processing ensures that the conductive layer is exposed only where required for adhesion, while maintaining its integrity in other regions, and allows different areas to have different treatment intensities.
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 method enables the production of liquid crystal aligning films that are compatible with roll-to-roll continuous processes, minimize damage to the conductive layer, and provide excellent adhesion and moisture/bubble blocking properties, even in harsh environments, thereby improving the manufacturing efficiency and environmental sustainability.
Implementation Method 1
etching one area of the liquid crystal alignment layer by irradiating a pulse laser to the multilayer structure
Implementation Method 2
exposing one area of the conductive layer by removing the passivation film, in which the pulse laser is irradiated to the liquid crystal alignment layer from the passivation film
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(c)
AI summary
The present invention relates to a method for manufacturing a liquid crystal aligning film, which is compatible with a continuous process.