Black Matrix Resist Composition for LCD Color Filters
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Solution Overview
Problem
Current black pigments for color filters, particularly in LCDs, face challenges such as poor dispersibility, excessive conductivity, high UV-A absorption, and unsatisfactory thermal stability, which hinder the production of high-definition black matrices with low roughness and uniform light absorption.
Innovation Solution
A resist composition comprising 10-70% colorants, primarily obtained by reacting compounds of specific formulas in a molar ratio of 1:2 with a catalyst of pK value ≤ 4.5, along with actinically reactive binder materials and optional non-reactive components, to achieve high optical density and low conductivity, suitable for producing black matrices with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black pigment is used for black matrices, then color strength and stability are improved, but electric conductivity becomes excessive and dispersibility deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the particle size distribution of carbon black pigment, using a specific d50 value range (0.03-0.1 μm) and d90/d50 ratio (2.0-5.0) to optimize both color strength and electrical conductivity properties simultaneously
Solution Approach 2:
The patent uses composite materials by combining carbon black pigment with specific binder resins (polyester resin, acrylic resin) and dispersants to create a resist composition that achieves low conductivity while maintaining high color strength and dispersibility
2Illumination intensity
If carbon black pigment is used for black matrices, then color strength is improved, but dispersibility deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the particle size parameters (d50: 0.03-0.1 μm, d90/d50 ratio: 2.0-5.0) of carbon black pigment to achieve optimal dispersibility while maintaining high color strength in the resist composition
Solution Approach 2:
The patent uses dispersants as intermediary substances to facilitate the dispersion of carbon black pigment particles in the resist composition, overcoming the inherent poor dispersibility of fine carbon black particles
3Illumination intensity
If conventional carbon black is used, then color strength is improved, but UV-A absorption increases excessively
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution of carbon black pigment (specific d50 and d90/d50 ratio ranges) to reduce UV-A absorption while maintaining high visible light absorption and color strength
4Illumination intensity
If high pigment content is used in resist composition, then optical density is improved, but viscosity increases
Solution Approach 1:
The patent uses dispersants and specific binder resins as intermediary substances to maintain low viscosity even at high carbon black pigment content (3-10 parts by weight), enabling high optical density without excessive viscosity increase
Solution Approach 2:
The patent applies parameter changes by optimizing the particle size distribution of pigment particles to reduce aggregation and maintain low viscosity at high pigment concentrations in the resist composition
5Illumination intensity
If thick layers are used for black matrices, then light absorption is improved, but curing sensitivity deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the particle size distribution of carbon black pigment to achieve high light absorption in thick layers while maintaining curing sensitivity through proper resist composition formulation
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 high optical density, low conductivity, and thermal stability, enabling the production of high-definition black matrices that meet the requirements for LCDs, including low roughness and uniform light absorption, while being compatible with various manufacturing processes.
Implementation Method 1
high, ideally uniform absorption of the entire visible light
Implementation Method 2
actinically curable compositions
Data Source
Figure 1~3
AI summary
Actinically modifiable composition comprising, all based on the entire composition, ° 10 - 70% by weight of a colorant or a mixture of colorants; ° 90 - 30% by weight of actinically reactive binder material consisting of components selected from the group consisting of binders, binder precursors, dispersants, photoinitiators and stabilizers, although optionally from 0% to 30% by weight of the actinically reactive binder material can be non-reactive components; and ° 0 - 10% by weight of further, non-reactive constituents; characterized in that ° the composition has an optical density = 1.0, preferably = 1.2 and more preferably = 1.4 in the entire wavelength range 430 - 650 nm per 1 µm layer thickness; and ° the colorant or 50 - 100% by weight, preferably 60 - 100% by weight and more preferably 70 - 100% by weight of the colorant mixture comprises a colorant obtainable by reaction of a compound of the formula (i) with a compound of the formula (ii) in a molar ratio of 1:2, in the presence of a catalyst having a pK value = 4.5 in water at 25°C, or a mixture of such colorants, wherein the black colorant is likely a product of the formula (iii) or a tautomer or isomer thereof. Likewise claimed are the use of this composition for producing colour filters, colour filters themselves and also a process for producing colour filters.