Triarylmethane Compound for Blue Pixel Color Filters
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Solution Overview
Problem
Triarylmethane compounds used in blue pixel portions of color filters exhibit insufficient light and heat resistance, leading to changes in hue and reduced brightness over time, especially at high temperatures.
Innovation Solution
A triarylmethane compound with a specific heteropolyoxometalate anion, such as (SiMoW11O40)4−, is used to maintain light resistance and improve heat resistance, allowing for minimal hue change and sustained brightness in liquid crystal display applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If triarylmethane pigments are used to form a blue pixel portion to achieve higher brightness, then brightness is improved, but heat resistance deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the triarylmethane pigment by introducing specific substituents (electron-withdrawing groups like -NO2, -CF3, and electron-donating groups like -N(R2) at defined positions) to optimize the balance between brightness and heat resistance. This structural parameter modification allows the pigment to maintain high brightness while achieving sufficient heat resistance for liquid crystal display applications
Solution Approach 2:
The patent creates a composite pigment structure by combining multiple aromatic rings with specific substituent patterns. The molecule integrates electron-withdrawing and electron-donating groups in a coordinated arrangement, forming a composite structural system that simultaneously achieves high brightness and improved heat resistance properties
2Illumination intensity
If triarylmethane pigments are used to form a blue pixel portion to achieve higher brightness, then brightness is improved, but light resistance deteriorates
Solution Approach 1:
The patent modifies the molecular structure parameters by positioning specific functional groups at defined locations on the aromatic rings. The electron-withdrawing groups at positions 2 and 6, and the electron-donating amino group at position 4, create an optimized electron distribution pattern that enhances light resistance while preserving high brightness characteristics
3Shape
If dioxazine violet pigment is used together with ε-copper phthalocyanine pigment to adjust color tone, then color tone is improved, but brightness deteriorates
Solution Approach 1:
The patent extracts the color tone adjustment function from a mixture of pigments and implements it within a single triarylmethane molecule. By incorporating multiple aromatic rings with specific substituent patterns, the molecule achieves both the desired color tone and high brightness independently, eliminating the need for mixing with ε-copper phthalocyanine pigment
Data Source
AI summary
There is provided a triarylmethane compound which can provide a colored product that has light resistance equivalent to heretofore available light resistance and that undergoes only a small change in hue over a long period of time even when having a high-temperature heat history. For example, when a blue pixel portion of a color filter is formed, there is provided a triarylmethane compound which can provide a liquid crystal display apparatus or the like that has light resistance equivalent to heretofore available light resistance and that can perform high-brightness liquid crystal display for a long time even at high temperature. There is also provided a color filter containing the triarylmethane compound in the blue pixel portion. In the triarylmethane compound, the counter-anion of a basic triarylmethane dye cation is a heteropolyoxometalate anion represented by (SiMoW11O40)4−/4. The color filter contains the triarylmethane compound in a blue pixel portion.