Quantum Dot Color Filter Wires for High-Resolution Light Conversion
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving high optical efficiency and resolution due to the use of color filters that reduce light by one-third, and existing quantum dot liquid crystal display devices struggle with manufacturing limitations in small sizes and high resolutions.
Innovation Solution
A color filter with multiple free-standing quantum dot color conversion layers that extend vertically from a substrate, featuring a high aspect ratio and sub-micrometer line widths, manufactured using a 3D printing method that forms structures through ink discharge and solvent evaporation via a meniscus mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional color filters are used to implement images, then colors can be displayed, but optical efficiency is low because each color filter reduces the amount of light by about one-third
Solution Approach 1:
The patent changes the material parameter of the color filter from conventional dye-based filters to quantum dot structures with specific size parameters (2-10 nm diameter). This parameter change enables the quantum dots to convert blue light to red and green light with high efficiency, reducing light loss while maintaining color reproduction quality.
Solution Approach 2:
The patent uses composite material structures including quantum dots embedded in polymer matrices (PMMA, polystyrene, polycarbonate) and combines multiple functional layers (quantum dot color conversion layer, liquid crystal layer, polarizer) to achieve both high optical efficiency and reliable color reproduction.
2Manufacturing precision
If conventional manufacturing techniques (inkjet printing, transfer printing, lithography) are used for quantum dot color conversion layers, then quantum dot patterns can be formed, but they have difficulty satisfying demands for small sizes and high resolutions
Solution Approach 1:
The patent transitions from two-dimensional planar quantum dot patterns to three-dimensional vertically extended wire structures with high aspect ratios (length/width ≥ 1). This dimensional change enables sub-micrometer line widths and high resolution while simplifying the manufacturing process through a single-step coating method rather than multiple patterning steps.
Solution Approach 2:
The patent creates local quality variations by forming quantum dot wire structures with different orientations (first direction for red/green, second direction for blue) and different dimensional characteristics (vertical extension with high aspect ratio) to optimize light conversion efficiency and achieve high resolution in different regions of the display.
3Length of moving object
If quantum dot color conversion layers are patterned using conventional techniques, then color conversion can be achieved, but the structures cannot achieve sub-micrometer or micrometer level line widths required for high resolution
Solution Approach 1:
The patent achieves sub-micrometer line widths by extending quantum dot structures vertically to form wire structures with high aspect ratios. This vertical extension in the third dimension enables precise control of horizontal line widths at sub-micrometer levels while maintaining structural integrity and alignment accuracy.
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 enables high luminance and high resolution in quantum dot color filters, allowing for improved brightness per unit pixel area and precise alignment of structures, overcoming manufacturing limitations.
Implementation Method 1
directing excitation light in a low-wavelength band (for example, ultraviolet rays or blue light) from the backlight unit 40 into the color filter 10 and synthesizing light that has undergone wavelength conversion through quantum dot color conversion layers 12, 14, 16
Implementation Method 2
manufactured using a 3D printing method that forms structures through ink discharge and solvent evaporation via a meniscus mechanism
Data Source
AI summary
The present invention relates to a color filter having a quantum dot color conversion structure and a manufacturing method therefor. The present invention relates to a color filter having a plurality of quantum dot color conversion layers spaced apart from each other, wherein each of the quantum dot color conversion layers is a free-standing wire structure extending in a vertical direction from a substrate, and the ratio of the length to the width of the free-standing wire structure is 1 or more.