Color Transformation Filter Nanostructures for High Purity
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Solution Overview
Problem
Current display technologies, such as OLEDs, face challenges in achieving precise color transformation and filtering with existing color filters, which limits their ability to produce high color purity and efficiency in color reproduction.
Innovation Solution
A color transformation filter comprising nanostructures with a specific refractive index and a low refractive index layer, including a color transformation element, is used to transform and filter colors, with the nanostructures being arranged to output color light with a full width at half maximum of less than or equal to 15 nm, and the low refractive index layer containing materials like SiO2 or acrylic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional color filters are used in OLED displays, then the display device can achieve basic color reproduction, but the color purity is insufficient and the thickness cannot be reduced
Solution Approach 1:
The patent changes the physical parameters of the color filter by using nanostructures with specific refractive indices (e.g., TiO2, HfO2, BaTiO3, Cr2O3) arranged in patterns with controlled pitch and depth. This allows precise control over wavelength-selective reflection and transmission, achieving high color purity (FWHM ≤ 15 nm) while maintaining thin thickness (≤ 100 nm).
Solution Approach 2:
The patent employs composite material structures combining high-refractive-index nanostructures (TiO2, HfO2, BaTiO3, Cr2O3, Si, ZnS, ZnSe, GaP, InP, GaAs, GaN, AlAs2) with low-refractive-index materials (SiO2, acrylic, curable epoxy resin) to create a color transformation filter that achieves both thinness and high color purity through synergistic optical effects.
2Length of stationary object
If conventional color filters are used, then the display device maintains standard thickness, but additional optical filters are required to achieve miniaturization
Solution Approach 1:
The patent merges the color transformation function and wavelength-selective filtering function into a single integrated nanostructure layer, eliminating the need for separate optical filters. The color transformation element combined with nanostructures of specific pitch and depth achieves both color conversion and spectral filtering simultaneously, reducing device thickness and complexity.
Solution Approach 2:
The nanostructure layer performs multiple functions simultaneously: color transformation, wavelength-selective reflection, and spectral filtering. This multi-functional design eliminates the need for additional dedicated optical filters, achieving miniaturization while maintaining color purity.
3Manufacturing precision
If the full width of half maximum is reduced to ≤ 15 nm, then color purity is enhanced, but the nanostructure arrangement precision requirements increase
Solution Approach 1:
The patent replaces conventional mechanical filtering methods with optical resonance effects in nanostructures. By exploiting surface plasmon resonance and dielectric resonance, the system achieves wavelength-selective response with FWHM ≤ 15 nm. The resonance conditions are controlled through nanostructure geometry (pitch, depth, shape) rather than requiring precise mechanical assembly, making the precision requirement more manageable.
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
This solution enhances color purity and reduces the thickness of the display device, allowing for miniaturization and improved color reproduction without the need for additional optical filters, making it suitable for applications like augmented reality glasses and virtual reality glasses.
Implementation Method 1
a plurality of nanostructures included in a subpixel and spaced apart from each other, the plurality of nanostructures having a first refractive index
Implementation Method 2
the plurality of nanostructures having a first refractive index, a low refractive index layer provided adjacent to the plurality of nanostructures, the low refractive index layer having a second refractive index less than the first refractive index
Implementation Method 3
a color transformation element included in the low refractive index layer
Implementation Method 4
configured to output color light having a full width of half maximum less than or equal to 15 nm
Data Source
AI summary
Provided is a color transformation filter including a plurality of nanostructures included in a subpixel and spaced apart from each other, the plurality of nanostructures having a first refractive index, a low refractive index layer provided adjacent to the plurality of nanostructures, the low refractive index layer having a second refractive index less than the first refractive index, and a color transformation element included in the low refractive index layer.