Flexible Quantum Dot Color Filter for Higher Blue Light Utilization
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Solution Overview
Problem
The light output ratio of conventional monochrome chips with a color conversion layer in quantum dot display technology is very low.
Innovation Solution
A flexible color filter comprising a polymer resin substrate with receiving grooves for red, green, and blue light, a reflective layer, and a quantum dot layer with a light diffusion layer to enhance blue light absorption and conversion into RGB colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional monochrome chip with a color conversion layer is used, then the device complexity is reduced, but the light output ratio becomes very low
Solution Approach 1:
The patent segments the color filter into multiple functional layers: a polymer resin substrate, a reflective layer, and a light diffusion layer. This segmentation allows each layer to perform its specific function optimally, with the light diffusion layer enhancing blue light absorption and the reflective layer improving light extraction, thereby resolving the contradiction between simplified device structure and low light output ratio
Solution Approach 2:
The patent introduces a light diffusion layer as an intermediary between the blue light source and the quantum dot layer. This intermediary layer diffuses the blue light to increase the absorption path length and improve the light output ratio without significantly increasing device complexity
2Loss of energy
If the light diffusion layer is added to enhance blue light absorption, then the light output ratio increases, but the device complexity increases
Solution Approach 1:
The patent merges the light diffusion function with the color filter structure by integrating the light diffusion layer into the existing polymer resin substrate framework. This merging approach allows the light diffusion functionality to be added without requiring separate complex components, thus increasing light output ratio while minimizing the increase in device complexity
3Use of energy by moving object
If the reflective layer is disposed on the bottom of receiving grooves, then the utilization rate of blue light increases, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies the reflective layer locally at the bottom of specific receiving grooves rather than uniformly across the entire substrate. This local quality approach allows the reflective layer to be positioned precisely where it is most needed for blue light reflection, improving blue light utilization while reducing the overall manufacturing precision requirements compared to a uniform reflective coating
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 ensures high absorption and utilization of blue light, increasing the light output ratio and achieving high color gamut and purity for full-color display.
Implementation Method 1
The quantum dot layer absorbs the blue light and emits fluorescence
Implementation Method 2
The blue light in the reflective layer is refracted and reflected back to the quantum dot layer
Implementation Method 3
The blue light in the reflective layer is refracted and reflected back to the quantum dot layer
Implementation Method 4
part of the fluorescence emitted to the surroundings is scattered by the light diffusion layer for enhancing the absorption of the blue light
Data Source
AI summary
A flexible color filter, a method of manufacturing thereof, and a full-color micro light-emitting diode device are provided. The full-color micro light-emitting diode device includes a flexible color filter. The flexible color filter includes a polymer resin substrate, a reflective layer, a light diffusion layer, and a quantum dot layer.