Titanium Black Dispersed Composition for Light Shielding
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Solution Overview
Problem
Conventional light shielding color filters face challenges with the dispersibility and stability of titanium black, leading to issues with pattern formability and light shielding performance, particularly in solid-state imaging devices where uniform light shielding across larger areas is required, and in liquid crystal display devices where high contrast is needed.
Innovation Solution
A dispersed composition using a polymer compound with an acidic group linked via a linking group, such as an aromatic ring, ether, ester, amide, urea, or urethane group, is employed to enhance the dispersibility and stability of titanium black, combined with a solvent and a photopolymerizable composition including a polymerization initiator, to form a light shielding color filter with improved adhesion and light shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filling amount of titanium black is increased to improve light shielding properties, then light shielding ability is improved, but dispersibility deteriorates and pattern formability becomes difficult
Solution Approach 1:
A polymer dispersant with specific molecular structure (containing acidic groups linked via linking groups with 2-20 atoms) is introduced as an intermediary between titanium black particles and the resin matrix. This dispersant mediates the interaction, enabling high titanium black filling amounts while maintaining good dispersibility and pattern formability, thus resolving the contradiction between light shielding ability and ease of manufacture
Solution Approach 2:
The invention changes the chemical parameters of the dispersant system by specifying a polymer dispersant with acidic groups (carboxylic acid, sulfonic acid, or phosphoric acid) connected through linking groups containing 2-20 atoms. This parameter change in the dispersant structure enables effective dispersion of high concentrations of titanium black, allowing both high light shielding ability and good pattern formability
2Ease of manufacture
If carbon black is used as the black coloring material, then dispersibility is relatively good, but light shielding properties are insufficient compared to titanium black
Solution Approach 1:
The invention creates a composite material system consisting of titanium black particles dispersed in a resin matrix using a specifically designed polymer dispersant. This composite structure combines the superior light shielding properties of titanium black with the dispersing capabilities of the polymer dispersant, achieving both high light shielding ability and good dispersibility that neither material could achieve alone
3Area of stationary object
If a light shielding film with large area is formed for solid-state imaging devices, then light shielding coverage is improved, but thickness uniformity deteriorates due to step formation
Solution Approach 1:
The invention changes the rheological parameters of the photosensitive composition by incorporating a polymer dispersant with specific molecular characteristics (acidic groups linked via 2-20 atom linking groups). This modifies the flow and leveling behavior of the coating, enabling uniform thickness distribution across large areas during the forming process, thus preventing step formation while maintaining large coverage area
4Reliability
If titanium black is used to achieve high light shielding properties, then light shielding ability is improved, but dispersibility and storage stability become problematic due to large specific gravity
Solution Approach 1:
A polymer dispersant with acidic groups (carboxylic acid, sulfonic acid, or phosphoric acid) connected through linking groups containing 2-20 atoms serves as an intermediary that anchors to titanium black particles and provides steric stabilization. This mediator prevents aggregation and precipitation of high-density titanium black, ensuring excellent dispersibility and storage stability while maintaining high light shielding ability
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 solution provides a dispersed composition with high dispersibility and storage stability, enabling the formation of light shielding films with excellent light shielding properties and adhesion sensitivity, suitable for both solid-state imaging devices and liquid crystal display devices, while facilitating the production of wafer-level lenses with precise light regulation.
Implementation Method 1
a polymer compound having an acidic group which is linked to a main chain part via a linking group
Implementation Method 2
a photopolymerizable composition including a polymerization initiator
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention provides a dispersed composition including: (A) titanium black; (B) a polymer compound including a constituent component having a side chain structure to which an acidic group is linked via a linking group; and (C) a solvent. The (B) polymer compound is a polymer having a structure in which an acidic group is linked to a main chain part via a linking group.