Colored Photosensitive Composition for LCD Adhesion and Ion Elution
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Solution Overview
Problem
Existing colored photosensitive compositions for liquid crystal display devices face challenges in achieving sufficient adhesion to substrates and minimizing metal ion elution, which can result in low image definition and defective displays due to cross-talking.
Innovation Solution
A colored photosensitive composition incorporating a squarylium-based dye, a multifunctional thiol compound, and an oxime-based photopolymerization initiator, along with a polymerizable compound, is used to enhance adhesion and suppress metal ion elution, thereby improving image contrast and definition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dye is used as a coloring agent in a colored photosensitive composition, then the hue and brightness of the displayed image can be improved, but the adhesion to the substrate may be insufficient and metal ion elution may increase
Solution Approach 1:
The patent uses a composite photosensitive composition containing both a dye (for color purity and brightness) and a pigment (for stability and adhesion). This composite approach allows the composition to achieve the vivid hue and brightness of dyes while maintaining the excellent adhesion and low metal ion elution characteristics of pigments, thereby resolving the technical contradiction between image quality and reliability.
2Manufacturing precision
If a colored photosensitive composition is used for forming color filters, then the production process is stable and positional precision is ensured, but the adhesion to substrate and electrical properties may be insufficient
Solution Approach 1:
The patent employs a composite photosensitive composition that combines dye and pigment components. This composite formulation maintains the manufacturing precision and positional accuracy achieved through photolithography while simultaneously improving adhesion to the substrate and electrical properties by leveraging the complementary strengths of both dye and pigment materials.
Solution Approach 2:
The patent modifies the compositional parameters of the photosensitive material by incorporating specific ratios of dye and pigment, along with appropriate binders and solvents. This parameter optimization allows the composition to achieve both excellent patterning precision through photolithography and improved adhesion/electrical properties, resolving the contradiction between manufacturing precision and reliability.
3Measurement precision
If metal ions are eluted from the color filter, then the definition of the image pattern decreases and cross-talking may occur, but using conventional compositions may not sufficiently suppress metal ion elution
Solution Approach 1:
The patent converts the potential harm of metal ion elution by using a pigment-dye composite where the pigment component acts as a stabilizing matrix that traps and immobilizes metal ions, preventing their elution. This approach transforms the composition structure to actively suppress metal ion release, thereby maintaining high image pattern definition and preventing cross-talking.
Solution Approach 2:
The composite photosensitive composition containing both dye and pigment creates a synergistic effect where the pigment provides a stable matrix that suppresses metal ion elution, while the dye maintains color purity. This composite structure effectively reduces metal ion release, preserving image pattern definition and preventing cross-talking issues.
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 sensitivity, excellent adhesion, and reduced metal ion elution, resulting in high-quality images with improved contrast and electrical properties for liquid crystal display devices.
Implementation Method 1
a photopolymerization initiator represented by the following Formula (2), and a polymerizable compound
Implementation Method 2
a dye represented by the following Formula (1)... compounds having a wide variety of colorant mother structures, such as squarylium-based dyes
Data Source
AI summary
A colored photosensitive composition includes: (A) a dye represented by the following Formula (1); (B) a multifunctional thiol compound; (C) a photopolymerization initiator represented by the following Formula (2); and (D) a polymerizable compound. In Formula (1), each of A and B independently represents an organic group containing an aromatic ring or an organic group containing a heterocyclic ring. In Formula (2), each of C, D, and E independently represents a hydrogen atom or an organic group.