Etch Resist Solution for LCD Blanket Swelling Prevention
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Solution Overview
Problem
The existing etch resist solutions used in reverse resist printing for forming thin film patterns in liquid crystal display panels cause swelling and reduce the life of the blanket, leading to decreased reliability and increased fabrication costs due to solvent permeation into polydimethylsiloxane (PDMS) blankets.
Innovation Solution
An etch resist solution is developed with a printing solvent that satisfies specific solubility parameter and dipole moment conditions (6>δsolvent or δsolvent>11, or 6<δsolvent<11 and μ<2(D)) to prevent solvent interaction with the blanket, combined with a carrier solvent and surfactant, ensuring uniform coating and pattern transfer without swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional etch resist solution with common printing solvent is used, then the solution can be easily coated and printed, but the solvent permeates into the PDMS blanket causing swelling and reducing blanket life
Solution Approach 1:
The patent changes the chemical parameters of the printing solvent by selecting compounds with specific solubility parameters (δ between 7.3-10.0 cal¹/²cm⁻³/²) and dipole moments (μ less than 2.0 D). This parameter selection prevents solvent-PDMS interaction while maintaining coating and printing functionality, thus resolving the contradiction between ease of operation and blanket life reliability
Solution Approach 2:
The patent uses alternative solvent molecules that replicate the essential functions of conventional solvents (dissolving resin, enabling flow, allowing printing) without having the harmful permeation property. The selected solvents copy the useful functions while eliminating the harmful effect on PDMS blanket integrity
2Productivity
If conventional etch resist solution is used, then the printing process can proceed normally, but the solvent causes swelling of the blanket reducing fabrication reliability
Solution Approach 1:
By changing the solvent parameters (solubility parameter δ and dipole moment μ) to specific ranges, the patent maintains the solvent's ability to dissolve resin and enable printing operations while preventing the swelling effect that compromises fabrication reliability. This allows continuous printing process with improved reliability
3Ease of manufacture
If conventional etch resist solution is used, then the solution provides adequate coating properties, but solvent permeation increases fabrication costs due to reduced blanket life
Solution Approach 1:
The patent selects solvents with specific parameters that maintain adequate coating properties (wetting, spreading, drying) while preventing PDMS blanket swelling. This extends blanket operational life and reduces replacement frequency, thereby reducing fabrication costs associated with blanket replacement
Solution Approach 2:
Instead of using expensive blankets that degrade quickly from solvent exposure, the patent selects inexpensive solvent alternatives that protect the blanket investment, effectively reducing the operational cost per fabrication cycle
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 solution improves the life of the blanket and enhances the reliability of thin film pattern formation, reducing fabrication costs by preventing solvent-induced swelling and ensuring precise pattern transfer.
Implementation Method 1
a printing solvent that satisfies the condition 6>δsolvent or δsolvent>11, where δsolvent is the solubility parameter of the solvent
Implementation Method 2
prevent solvent interaction with the blanket, combined with a carrier solvent and surfactant, ensuring uniform coating and pattern transfer without swelling
Data Source
AI summary
A method of fabricating a thin film pattern improve the life of a blanket and reduce the cost and improve reliability in forming the thin film pattern. The method includes injecting an etch resist solution into a blanket on a printing roller, wherein the etch resist solution includes a printing solvent that satisfies the condition 6>δsolvent or δsolvent>11, where δsolvent is the solubility parameter of the solvent, or satisfies the condition 6<δsolvent<11 and μ<2(D), where μ is the dipole moment of the solvent; rotating the printing roller to uniformly coat the etch resist solution on the blanket; rolling the printing roller coated with the etch resist solution onto a printing plate to pattern the etch resist solution to thereby form an etch resist pattern; transferring the etch resist pattern from the printing roller to a substrate; hardening the etch resist pattern; and forming a desired thin film pattern on the substrate using the etch resist pattern.