Dichroic Dye Color Filter for LCD Heat Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional color filter systems for liquid crystal displays face issues with heat resistance, durability, and polarizing properties due to the use of pigments, which lead to inferior contrast ratios and light fastness, particularly when exposed to hot and humid environments.
Innovation Solution
A novel dichroic dye with liquid crystal and polymerizable properties, structured as R1-L1-M-L2-D, is developed, where R1 is a reactive end functional group, M has liquid crystal properties, and D is a dichroic structure, linked by L1 and L2, forming a coating layer that enhances durability and polarizing properties without using particulate materials like pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pigment dispersion method is used for color filter, then color saturation can be achieved, but heat resistance and durability deteriorate under hot and humid environments
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional pigments with dichroic dyes that have polymerizable groups. This parameter change enables the color filter to maintain both color saturation and heat resistance by allowing molecular-level integration into the resin matrix rather than physical dispersion of particulate pigments.
Solution Approach 2:
The patent creates a composite material system where dichroic dye molecules are chemically bonded to polymer resin through polymerizable groups. This composite approach eliminates the interface between pigment particles and resin, preventing degradation under heat and humidity while maintaining optical properties.
2Ease of manufacture
If pigment dispersion method is used for color filter, then manufacturing process can be simplified, but polarizing properties and contrast ratio deteriorate
Solution Approach 1:
The patent changes the physical state parameter of the coloring material from particulate (pigment) to molecular (dichroic dye). This parameter change enables the material to align with the resin matrix and achieve proper polarizing properties while maintaining ease of manufacture through the same coating and curing process.
3Manufacturing precision
If conventional dichroic dye without polymerizable groups is used, then polarizing properties can be improved, but durability and heat resistance deteriorate
Solution Approach 1:
The patent creates a chemically bonded composite where dichroic dye molecules with polymerizable groups form covalent bonds with the polymer resin matrix. This chemical integration ensures the dichroic dye molecules remain fixed in their oriented positions, maintaining polarizing properties while significantly improving durability and heat resistance compared to physically mixed systems.
4Illumination intensity
If pigment-based color filter is used, then color display can be achieved, but light scattering occurs reducing resolution
Solution Approach 1:
The patent changes the scale parameter of the coloring material from micrometer-scale pigment particles to molecular-scale dichroic dye molecules. This parameter change eliminates light scattering by removing the particle-size interface, thereby improving resolution while maintaining color display capabilities.
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 dichroic dye improves the heat resistance, durability, and polarizing properties of color filter layers, maintaining high contrast ratios and resolution even under hot and humid conditions, while eliminating the scattering issues associated with pigment-based systems.
Implementation Method 1
a novel dichroic dye having liquid crystal properties, dichroic properties and polymerizable reactivity
Implementation Method 2
R1 is a reactive end functional group... the dichroic dye being used to form a color filter layer
Data Source
AI summary
There is provided a novel dichroic dye having liquid crystal properties, dichroic properties and polymerizable reactivity, the dichroic dye being used to form a color filter layer having excellent physical properties such as dichroic ratio, heat resistance, durability, high contrast ratio and polarizing properties, a composition comprising the same for color filter, a color filter array plate (an upper plate) prepared therefrom, and a liquid crystal display comprising the color filter array plate. The dichroic dye has a structure of R1-L1-M-L2-D (wherein, D is a dichroic structure, M is a structure with liquid crystal properties, R1 is a reactive end functional group, and L and L1 are linking structures that link R1, M, and D), and the composition for forming a color filter layer includes the dichroic dye. Also, the color filter array plate, which comprises color filter layer formed of the composition of this invention and the liquid crystal display, which comprise the color filter array plate but does not requires an upper alignment film and/or a polarization plate are provided. The color filter array plate and the liquid crystal display comprising the same have excellent physical properties such as durability, polarizing degree, resolution and contrast ratio.