Quantum Dot Color Filter Layers for Higher Display Color Reproduction
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Solution Overview
Problem
Current display apparatuses face challenges in achieving improved optical efficiency and color reproduction, particularly as resolution increases, due to limitations in light scattering and color conversion mechanisms.
Innovation Solution
A color filter unit is designed with a multi-layer structure, incorporating light scattering layers with varying concentrations of scattering particles and quantum dots, and color conversion layers with specific particle ratios to enhance light scattering and conversion efficiency, along with light blocking layers and inorganic insulating layers to optimize light transmission and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single-layer structure with uniform scattering particles and quantum dots is used, then the device complexity is low, but the optical efficiency and color reproduction are insufficient
Solution Approach 1:
The color filter unit is divided into multiple layers: a light scattering layer containing scattering particles and first quantum dots, and a color conversion layer containing second quantum dots and color conversion particles. This segmentation allows each layer to perform its specific function optimally, improving overall optical efficiency and color reproduction while managing complexity through functional specialization.
Solution Approach 2:
Different layers are assigned different concentrations of scattering particles and quantum dots based on their specific functional requirements. The light scattering layer has optimized scattering particle concentration for maximum light scattering, while the color conversion layer has optimized quantum dot concentration for efficient wavelength conversion. This local optimization of material properties enhances overall performance.
2Ease of manufacture
If scattering particles and quantum dots are mixed uniformly in a single layer, then the manufacturing process is simple, but the light scattering and color conversion efficiency are compromised
Solution Approach 1:
The color filter unit is divided into multiple layers: a light scattering layer containing scattering particles and first quantum dots, and a color conversion layer containing second quantum dots and color conversion particles. This segmentation allows each layer to perform its specific function optimally, improving overall optical efficiency and color reproduction while managing complexity through functional specialization.
Solution Approach 2:
Different layers are assigned different concentrations of scattering particles and quantum dots based on their specific functional requirements. The light scattering layer has optimized scattering particle concentration for maximum light scattering, while the color conversion layer has optimized quantum dot concentration for efficient wavelength conversion. This local optimization of material properties enhances overall performance.
3Illumination intensity
If high concentrations of scattering particles are used throughout, then light scattering is maximized, but light transmission is reduced
Solution Approach 1:
Different layers are assigned different concentrations of scattering particles and quantum dots based on their specific functional requirements. The light scattering layer has optimized scattering particle concentration for maximum light scattering, while the color conversion layer has optimized quantum dot concentration for efficient wavelength conversion. This local optimization of material properties enhances overall performance.
Solution Approach 2:
The patent transitions from a single-layer uniform structure to a multi-layer vertical structure, distributing scattering particles and quantum dots across different vertical dimensions. This allows light to undergo multiple scattering events and wavelength conversions as it propagates through the layers, achieving high scattering efficiency without excessive transmission loss.
4Measurement precision
If resolution is increased to improve display quality, then image clarity is enhanced, but color reproduction of each pixel deteriorates
Solution Approach 1:
The color filter unit is divided into multiple layers: a light scattering layer containing scattering particles and first quantum dots, and a color conversion layer containing second quantum dots and color conversion particles. This segmentation allows each layer to perform its specific function optimally, improving overall optical efficiency and color reproduction while managing complexity through functional specialization.
Solution Approach 2:
Different layers are assigned different concentrations of scattering particles and quantum dots based on their specific functional requirements. The light scattering layer has optimized scattering particle concentration for maximum light scattering, while the color conversion layer has optimized quantum dot concentration for efficient wavelength conversion. This local optimization of material properties enhances overall performance.
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 optical efficiency and color reproduction by separating scattering and color conversion mechanisms, ensuring consistent luminance and enhanced color accuracy across different pixels, while maintaining transmittance and reducing manufacturing costs.
Implementation Method 1
a light scattering layer corresponding to the display element, the light scattering layer including first scattering particles and first quantum dots
Implementation Method 2
first quantum dots and second quantum dots configured to convert incident light into light of a set color
Data Source
AI summary
A color filter unit having improved optical efficiency and color reproduction and a display apparatus including the color filter unit are provided. The display apparatus includes a first pixel, a second pixel, and a third pixel on a first substrate, the first pixel, the second pixel, and the third pixel are configured to emit light of different colors from one another, wherein each of the first pixel and the second pixel includes a display element, a light scattering layer corresponding to the display element, the light scattering layer comprising first scattering particles and first quantum dots, and a color conversion layer on the light scattering layer, the color conversion layer including second scattering particles and second quantum dots configured to convert incident light into light of a set color.