Wavelength-Selective Absorption Filter for Light-Resistant Displays
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Solution Overview
Problem
Existing antireflection technologies for self-luminous display devices, such as those using OLED or LED elements, face challenges with light resistance and durability, particularly when compared to liquid crystal display devices, as absorption materials in these systems tend to deteriorate quickly under light exposure.
Innovation Solution
A wavelength selective absorption filter comprising a resin, a coloring agent, and a compound with specific polar groups, such as carboxylic acid ester or sulfonic acid amide bonds, is developed. This filter includes dyes with main absorption wavelengths in the ranges of 390-440 nm or 680-780 nm, which are dispersed in the resin to enhance light resistance and prevent dye association, thereby improving the filter's durability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If absorption materials are used in self-luminous display devices to prevent internal reflection, then antireflection performance is improved, but light resistance and durability deteriorate due to quick deterioration under light exposure
Solution Approach 1:
The patent changes the molecular weight parameter of the compound containing polar groups to 1,000 or less, which fundamentally alters the material properties. This parameter change enables the compound to effectively prevent dye association while maintaining excellent light resistance, resolving the contradiction between antireflection performance and durability in self-luminous display devices
Solution Approach 2:
The patent creates a composite wavelength selective absorption filter by combining resin, coloring agent (dye), and compound containing polar groups. This composite structure leverages the complementary properties of each component: the resin provides structural integrity, the dye provides absorption capability, and the compound with polar groups prevents dye association and enhances light resistance, thereby achieving both antireflection performance and durability
2Illumination intensity
If dyes are used to achieve wavelength selective absorption, then color reproduction is improved, but dye association occurs leading to reduced light resistance
Solution Approach 1:
The compound containing polar groups acts as an intermediary substance between dye molecules. It mediates the interaction between dyes by preventing their direct association through polar interactions, thereby maintaining the dyes' color reproduction capabilities while protecting them from aggregation-induced deterioration and enhancing overall light resistance
Solution Approach 2:
By controlling the molecular weight of the compound containing polar groups to be 1,000 or less, the patent optimizes the compound's ability to interact with dye molecules. This parameter change ensures effective prevention of dye association while maintaining the dyes' optical properties for excellent color reproduction
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 proposed filter effectively suppresses light-induced degradation, maintaining high antireflection performance and color reproduction while ensuring excellent light resistance, even in bright environments, by using dyes with specific absorption ranges and polar groups to prevent dye association and enhance durability.
Implementation Method 1
a compound that has at least one polar group of a carboxylic acid ester bond, a carboxylic acid amide bond, a sulfonic acid amide bond, a urethane bond, or a sulfonyl bond and has a molecular weight of 1,000 or less
Implementation Method 2
the coloring agent includes at least one of the following dye A or the dye D... a wavelength of two wavelengths, on a long wavelength side, which provide an absorbance of 20% with respect to an absorbance maximal value at a wavelength of 390 to 440 nm
Data Source
AI summary
A wavelength selective absorption filter contains a resin, a coloring agent, and a compound having at least one polar group of a carboxylic acid ester bond, a carboxylic acid amide bond, a sulfonic acid amide bond, a urethane bond, or a sulfonyl bond and a MW≤1,000 where dye includes at least one of dye A having a main absorption wavelength range at a wavelength of 390 to 440 nm and dye D having a main absorption wavelength range at a wavelength of 680 to 780 nm, a 20% value wavelength A with respect to an absorbance maximal value exhibited by a main absorption wavelength is 455 nm or less where dye A is contained, and a 20% value wavelength D with respect to the absorbance maximal value exhibited by the main absorption wavelength is 640 nm or more where dye D is contained, and a display device.