Alkylene Glycol-Modified Bisphenol A Acrylate for Color-Filter Patterning
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Solution Overview
Problem
Existing photosensitive resin compositions face limitations in achieving both thinness and high resolution due to the trade-off between high pigment content and binder resin content, which affects developability.
Innovation Solution
A photosensitive resin composition incorporating a modified bisphenol A acrylate compound with an alkylene glycol repeating unit, along with specific ratios of colorant, binder resin, and photopolymerizable compounds, enhances developability and curability, allowing for high-resolution and thin photosensitive resin layers and color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pigment content in the photosensitive resin composition is increased to secure coloring power and thin the color filter, then the coloring power and thinness are improved, but the developability deteriorates due to the relatively decreased binder resin content
Solution Approach 1:
The invention increases the acid value of the binder resin from conventional levels (typically 1-10) to a high acid value range of 20-80, which fundamentally changes the chemical parameters of the system. This parameter change enables the binder resin to maintain sufficient developability even when pigment content is high (70-90 wt%), as the high acid value creates stronger interaction with the alkaline developer solution. The invention also specifies a controlled binder resin content of 5-20 wt% and pigment content of 70-90 wt%, optimizing the composition ratios to resolve the contradiction between coloring power and developability.
2Manufacturing precision
If the pixel size is reduced to increase resolution, then the resolution is improved, but the manufacturing precision and pattern formation become more difficult
Solution Approach 1:
The invention modifies the photopolymerizable compound parameters by selecting compounds with specific molecular weights and reactivity ratios. The use of monofunctional acrylates (e.g., ethyl acrylate, butyl acrylate) alongside polyfunctional acrylates creates an optimized polymerization kinetics profile that enables precise pattern formation at reduced pixel sizes. The acid value of the binder resin (20-80) is also optimized to enhance contrast during development, improving the definition of fine patterns.
Solution Approach 2:
The invention creates a composite photosensitive resin composition combining multiple components with complementary functions: high acid value binder resin for developability, specific photopolymerizable compounds for curability and resolution, and pigments for coloring power. This composite approach synergistically resolves the contradiction between high resolution and ease of manufacture, as each component contributes to both pattern precision and manufacturability.
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 developability and curability, resulting in high-resolution color filters with thin thickness, enhancing patterning properties and reducing residue.
Implementation Method 1
a photopolymerization initiator; and a solvent, wherein the photopolymerizable compound includes at least one modified bisphenol A acrylate compound including an alkylene glycol repeating unit
Data Source
AI summary
This disclosure relates to a photosensitive resin composition, a photosensitive resin layer manufactured using the same, and a color filter. In an embodiment, a photosensitive resin composition includes (A) a colorant; (B) a binder resin; (C) a photopolymerizable compound; (D) a photopolymerization initiator; and (E) a solvent, wherein the photopolymerizable compound includes at least one modified bisphenol A acrylate compound including an alkylene glycol repeating unit, the modified bisphenol A (meth)acrylate compound is an alkylene glycol modified bisphenol A (meth)acrylate, an alkylene glycol modified bisphenol A di(meth)acrylate, or a combination thereof, a total number of alkylene glycol repeating units in the modified bisphenol A (meth)acrylate compound is an integer from 4 to 30, and the modified bisphenol A (meth)acrylate compound is included in an amount of 20 wt % to 60 wt % of the total photopolymerizable compound.