Color Filter With Quantum Dots and Selective Transmission Layers
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Solution Overview
Problem
Color mixing occurs in display devices due to the non-selective transmission of light by color conversion layers, leading to deteriorated color reproduction and luminescent efficiency.
Innovation Solution
A color filter design featuring a substrate with pixel areas and light-blocking areas, incorporating quantum dots that convert incident light into specific colors and selective transmission layers to prevent color mixing, including a light-blocking layer and an upper color filter layer for improved light recycling and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a quantum dot color conversion layer is used to improve luminescent efficiency, then color conversion capability is improved, but color mixing occurs leading to deteriorated color reproduction
Solution Approach 1:
The patent divides the color filter structure into multiple functional layers: a quantum dot color conversion layer for wavelength conversion, and separate color filter layers for each primary color (red, green, blue). This segmentation allows the quantum dot layer to efficiently convert light wavelengths while the individual color filter layers prevent color mixing, thereby resolving the contradiction between improved luminescent efficiency and maintained color reproduction accuracy.
Solution Approach 2:
The patent applies different functional properties to different regions of the display structure. The quantum dot layer provides wavelength conversion in specific pixel areas, while color filter layers are selectively positioned in light-blocking areas and on sidewalls of adjacent pixels. This local differentiation enables efficient color conversion where needed while preventing color mixing at pixel boundaries, thus resolving the contradiction between luminescent efficiency and color reproduction precision.
2Manufacturing precision
If a conventional color filter is used to achieve color selection, then color purity is improved, but emission intensity is reduced to about 1/3 of original intensity
Solution Approach 1:
The patent merges the advantages of both conventional color filters and quantum dot color conversion layers into a hybrid structure. The quantum dot layer converts broad-spectrum light into specific wavelengths with high efficiency, while conventional color filter layers maintain color purity. This combination allows the system to achieve both high emission intensity (through efficient quantum dot conversion) and high color purity (through selective filter layers), resolving the contradiction between these two parameters.
Solution Approach 2:
The patent ensures continuous useful action by having the quantum dot layer continuously convert incident light into desired wavelengths, and the color filter layers continuously select and transmit only the required color wavelengths. This continuous operation maximizes light utilization efficiency while maintaining color purity, thereby resolving the contradiction between emission intensity and color purity.
3Manufacturing precision
If light-blocking areas are increased to prevent color mixing, then color reproduction is improved, but light transmission efficiency is reduced
Solution Approach 1:
The patent introduces color filter layers as intermediary elements positioned in light-blocking areas and on sidewalls of adjacent pixels. These intermediary layers selectively transmit desired wavelengths while blocking unwanted wavelengths, thereby preventing color mixing without requiring extensive light-blocking areas. This resolves the contradiction between color reproduction accuracy and light transmission efficiency by using the color filter layers as mediators that differentiate light wavelengths rather than simply blocking them.
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
Enhances color reproduction and luminescent efficiency by selectively transmitting and reflecting light, preventing color mixing and improving color purity through the use of quantum dots and structured transmission layers.
Implementation Method 1
a first color conversion layer above the first pixel area and converting incident light into a first color light
Implementation Method 2
an upper color filter layer above the first color conversion layer and the first color filter layer, and reflecting the first color light
Data Source
AI summary
A color filter includes a substrate including a pixel area and a light-blocking area surrounding the pixel area, a color conversion layer above the pixel area and converting incident light into light of different color, and a color filter layer including a first portion between the color conversion layer and the substrate, and a second portion surrounding side surfaces of the color conversion layer, and selectively transmitting the light of different color.