Photosensitive Resin Composition for Transflective LCD
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Solution Overview
Problem
Conventional photosensitive resin compositions for transflective LCDs face challenges in simultaneously achieving high resolution fine patterns and good adhesion to substrates, often sacrificing adhesion for high resolution or vice versa.
Innovation Solution
A photosensitive resin composition using a blend of two binder resins with different molecular weight distributions, one without reactive groups and the other with reactive groups, as an alkali-soluble binder resin, where the first binder resin has a weight average molecular weight between 1,000 and 20,000, and the second between 20,000 and 80,000, enhancing resolution and adhesion respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photosensitive resin compositions use a single binder resin type, then the composition is simple to manufacture, but it cannot simultaneously achieve high resolution fine patterns and good adhesion to substrates
Solution Approach 1:
The patent uses a composite binder resin system comprising two distinct resin components: a first binder resin (weight average molecular weight 1,000-20,000) and a second binder resin (weight average molecular weight 20,000-80,000). This composite approach allows the lower molecular weight resin to provide high resolution pattern formation while the higher molecular weight resin ensures good adhesion to the substrate, thereby resolving the contradiction between pattern resolution and adhesion.
Solution Approach 2:
The patent applies parameter changes by controlling the weight average molecular weights of the binder resins within specific ranges (1,000-20,000 for the first resin, 20,000-80,000 for the second resin) and optimizing their weight ratio. This parameter optimization enables the composition to simultaneously achieve both high resolution fine patterns and good substrate adhesion, overcoming the limitations of conventional single-resin systems.
2Manufacturing precision
If conventional photosensitive resin compositions prioritize high resolution pattern formation, then fine patterns can be achieved, but adhesion to underlying substrates deteriorates
Solution Approach 1:
The patent employs a composite binder resin system where the first binder resin (lower molecular weight: 1,000-20,000) contributes to high resolution fine pattern formation, while the second binder resin (higher molecular weight: 20,000-80,000) provides strong adhesion to the substrate. This composite material approach allows both functions to coexist without compromise.
3Strength
If conventional photosensitive resin compositions prioritize good adhesion to substrates, then adhesion is improved, but the ability to form high resolution fine patterns deteriorates
Solution Approach 1:
The patent uses a composite binder resin system where the higher molecular weight second binder resin (20,000-80,000) provides strong substrate adhesion, while the lower molecular weight first binder resin (1,000-20,000) ensures high resolution fine pattern formation. The synergistic combination resolves the contradiction between adhesion and pattern resolution.
Solution Approach 2:
The patent optimizes the weight ratio and molecular weight parameters of the two binder resins to achieve a balance where good adhesion and high resolution pattern formation are simultaneously accomplished, overcoming the limitations of conventional single-resin compositions.
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 composition achieves improved adhesion to the substrate and the ability to form high resolution fine patterns, as demonstrated by SEM images showing effective pattern formation and substrate adherence.
Implementation Method 1
a photoinitiator for generating free radicals; a polymerizable compound having at least one ethylenically unsaturated bond
Implementation Method 2
polymerizable compound having at least one ethylenically unsaturated bond
Data Source
AI summary
Disclosed is a photosensitive resin composition suitable for use in a transflective liquid crystal display (LCD). The photosensitive resin composition uses, as an alkali-soluble binder resin, a blend of two kinds of binder resins. The first binder resin has a weight average molecular weight greater than or equal to 1,000 but lower than 20,000 and contains no reactive group. The second binder resin has a weight average molecular weight greater than or equal to 20,000 but lower than 80,000 and contains reactive groups. The photosensitive resin composition has good adhesion to an underlying substrate while forming a high resolution fine pattern.