Radiation-Sensitive Color Filter Composition Resolving Color Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Radiation-sensitive colored compositions used in color filters face issues with color purity due to color mixing with residue, where the residue from one color layer penetrates or remains on previously formed layers, leading to decreased color purity and resolution.
Innovation Solution
Incorporating a nonionic surfactant with a specific hydrophilic-lipophilic balance (HLB) value and partial structure into the radiation-sensitive colored compositions to reduce color mixing, which includes a dye, a photopolymerizable compound, and a photoinitiator, along with a nonionic surfactant that interacts with hydrophobic moieties of dyes and improves solubility in developers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radiation-sensitive colored compositions are applied successively to form multiple colored pixels, then colored patterns of multiple colors can be formed, but color mixing with residue occurs where the composition of another color penetrates or remains on previously formed pixels, decreasing color purity
Solution Approach 1:
A surfactant is introduced as an intermediary substance in the radiation-sensitive colored composition. The surfactant molecules interact with hydrophobic moieties of dyes and improve solubility in developers, preventing color mixing between adjacent pixels during the formation process. This intermediary substance resolves the contradiction by enabling multi-color formation while maintaining color purity through its surface-active properties.
Solution Approach 2:
The invention changes the chemical composition parameters of the radiation-sensitive colored composition by incorporating specific surfactants with controlled HLB values and molecular weights. This parameter change modifies the interaction between dye molecules and the development medium, preventing residue formation and color mixing while maintaining the ability to form multiple colored pixels with high color purity.
2Manufacturing precision
If dyes are used as colorants instead of pigments, then light scattering and color unevenness are reduced, but color mixing with residue occurs more readily when heated after film formation
Solution Approach 1:
The invention creates a composite material system by combining dyes with surfactants and photopolymerizable compounds in a radiation-sensitive composition. This composite structure allows the dye to maintain its superior color uniformity properties while the surfactant and polymerizable components provide thermal stability and prevent color mixing during heating, thus resolving the contradiction between color uniformity and thermal stability.
Solution Approach 2:
The invention modifies the physical and chemical parameters of the dye-containing composition by adding surfactants and photopolymerizable compounds. These parameter changes transform the dye from a heat-sensitive state to a heat-stable state through polymerization, while maintaining the dye's inherent advantage of reduced light scattering and color unevenness compared to pigments.
3Quantity of substance
If high concentrations of dyes are used to achieve strong coloring power, then color saturation is improved, but color purity decreases due to increased color mixing with residue
Solution Approach 1:
The surfactant acts as an intermediary that enables high dye concentrations to be used without sacrificing color purity. By improving dye solubility and preventing aggregation, the surfactant allows maximum dye loading while maintaining sharp color boundaries and preventing residue formation, thus resolving the contradiction between color saturation and color purity.
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 use of nonionic surfactants with specific HLB values and structures effectively reduces color mixing with residue, enhancing the stability and color purity of the resulting color filters, allowing for the production of high-resolution color filters with improved performance.
Implementation Method 1
a radiation-sensitive colored composition comprising: a dye, a photopolymerizable compound, a photoinitiator
Implementation Method 2
a nonionic surfactant that interacts with hydrophobic moieties of dyes and improves solubility in developers
Data Source
AI summary
Herein provided are radiation-sensitive colored compositions suppressing a phenomenon in which a radiation-sensitive colored composition of another color penetrates into previously formed pixels to result in a decrease in the color purity of the previously obtained pixels; cured colored films and color filters using them; processes for forming colored patterns; processes for preparing the color filters; solid-state image sensors; and image display devices.The radiation-sensitive colored compositions comprise a dyestuff, a photopolymerizable compound, a photoinitiator, and a nonionic surfactant containing a partial structure represented by formula (1) or (2) below and having a weight average molecular weight of 2500 or less and an HLB value of 9.2 to 15.5 as determined by Griffin's method. In formula (1) and (2), R1 and R2 each independently represent a hydrocarbon group containing 8 or more carbon atoms, and n1 and n2 each independently represent 4 to 25.