Photoresist Composition for LCD Array Substrates
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Solution Overview
Problem
The photolithography process for manufacturing liquid crystal display (LCD) array substrates faces challenges in maintaining consistent light energy intensity due to variations in the distance between the optical system and the substrate, leading to unreliable photoresist patterning and decreased reliability with larger substrates.
Innovation Solution
A photoresist composition comprising a binder resin, a photo acid generator, an acryl resin represented by Chemical Formula 1, and a solvent, which improves exposure margins and thermal resistance, allowing for more reliable patterning regardless of focus variations and physical factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the optical system and substrate varies, then the intensity of radiation changes, but the photoresist pattern cannot be formed reliably
Solution Approach 1:
The patent modifies the chemical composition parameters of the photoresist, specifically incorporating a sulfonic acid ester compound and controlling the molecular weight and functional group ratios of the binder resin. These parameter changes enable the photoresist to maintain stable patterning performance across varying radiation intensities caused by distance variations.
Solution Approach 2:
The patent creates a composite photoresist system by combining a binder resin with specific functional groups (carboxyl, hydroxyl, or amine groups) and a sulfonic acid ester compound. This composite material approach enhances the photoresist's robustness against focus variations and improves patterning reliability under different exposure conditions.
2Area of stationary object
If the substrate size is increased, then the manufacturing capacity improves, but the overall reliability of photoresist patterning decreases
Solution Approach 1:
The patent adjusts the molecular weight parameters of the binder resin (5,000-50,000) and controls the content ratios of functional groups to optimize the photoresist's performance on larger substrates. These parameter modifications ensure uniform patterning across extended substrate areas.
Solution Approach 2:
The patent incorporates a thermal curing step at 90-150°C for 30-120 seconds after photoexposure. This preliminary thermal treatment stabilizes the photoresist pattern before subsequent processing, preventing pattern degradation on large substrates and improving overall patterning reliability.
3Manufacturing precision
If the focus of the optical system changes due to distance variation, then the radiation intensity changes, but fine photoresist patterns cannot be formed
Solution Approach 1:
The patent optimizes the molecular weight and functional group composition of the binder resin to create a photoresist with enhanced sensitivity and contrast characteristics. This allows the formation of fine patterns even when radiation intensity varies due to focus changes.
Solution Approach 2:
The patent uses a sulfonic acid ester compound as a photoacid generator that efficiently converts exposure energy into chemical changes, creating an accurate copy of the mask pattern on the substrate despite variations in radiation intensity caused by focus deviations.
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 photoresist composition enhances the range of forming fine patterns and improves thermal resistance, thereby increasing the reliability of the photolithography process for LCD array substrates.
Implementation Method 1
a photo acid generator
Data Source
AI summary
A photoresist composition includes a binder resin, a photo acid generator, an acryl resin having four different types of monomers, and a solvent.