Color Filter Quantum Dot Metal Nanoparticle Resonance
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Solution Overview
Problem
Color filters in display apparatuses suffer from luminance degradation due to the limited transmission of light, with existing methods like adding fluorescent dyes not effectively addressing this issue.
Innovation Solution
A color filter design incorporating quantum dots and metal nanoparticles of specific sizes and shapes, arranged to form resonance structures and spaced appropriately, along with graft molecules, to enhance light transmission and emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter is used to form color by transmitting only light of corresponding color, then color formation is achieved, but luminance is degraded because only about 1/3 of incident light is transmitted
Solution Approach 1:
The patent changes the physical and chemical parameters of the color filter by incorporating quantum dots with specific size ranges (first quantum dots: 20-40nm, second quantum dots: 40-60nm, third quantum dots: 60-80nm) and metal nanoparticles with controlled sizes and shapes. These parameter changes enable the color filter to maintain color formation while significantly improving light transmission efficiency and luminance through quantum confinement effects and plasmon resonance
Solution Approach 2:
The patent uses composite materials by combining quantum dots (CdSe, CdTe, ZnSe, ZnTe, HgSe, HgTe, or their alloys) with metal nanoparticles (Au, Ag, Al, Al2O3, Co, Cu, Cr, Pt, Ni, Fe, Mo, or W) in the color filter structure. This composite approach allows simultaneous achievement of color formation, enhanced light absorption, and improved luminance through the synergistic effects of quantum confinement and localized surface plasmon resonance
2Illumination intensity
If fluorescent dye is added to color filter to address luminance degradation, then luminance is improved, but color accuracy and light efficiency are not effectively enhanced
Solution Approach 1:
The patent replaces fluorescent dyes with quantum dots whose emission wavelengths are precisely controlled by their size parameters. By adjusting quantum dot size (20-80nm range), the emission color can be accurately tuned while maintaining high luminance, achieving both color accuracy and light efficiency without the broad emission spectra that cause color degradation in fluorescent dye-based filters
Solution Approach 2:
The patent uses metal nanoparticles with specific sizes and shapes (including spherical and non-angulated curved surfaces) that provide stable plasmon resonance effects without the degradation issues of organic fluorescent dyes. These inorganic components offer long-term stability and reliable color accuracy, replacing the short-lived fluorescent dye approach
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 significantly improves luminance and color light emission efficiency, achieving higher luminance and color reproducibility in display apparatuses by optimizing photon extinction and excitation properties.
Implementation Method 1
A distance between the first metal nanoparticle and the first quantum dot may be determined such that the first metal nanoparticle and the first quantum dot form a resonance structure. A distance between the second metal nanoparticle and the second quantum dot may be determined such that the second metal nanoparticle and the second quantum dot form a resonance structure.
Implementation Method 2
a first quantum dot, and a first metal nanoparticle having a first predetermined size, the first filter exhibiting a first color. The color filter further includes a second filter including a second color forming material, a second quantum dot having a different size from the first quantum dot
Data Source
AI summary
A color filter includes a first filter. The first filter includes a first color forming material, a first quantum dot, and a first metal nanoparticle, the first filter exhibiting a first color.