Quantum Dot Color Filter Reflective Layer Design
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Solution Overview
Problem
Conventional color filters that use dyes in photoresist to disperse light for full-color display reduce backlight utilization and suffer from issues like quantum dot aggregation, low doping concentration, and leakage of excitation light, affecting color purity.
Innovation Solution
A color filter design incorporating a first quantum dot light emitting layer and a reflective layer, where quantum dots are stimulated to emit light of a specific wavelength, with a second quantum dot light emitting layer and light absorbing materials to enhance light utilization and purity, and a method for manufacturing this filter using specific solvents and layer formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional color filters use dyes in photoresist to disperse light for full-color display, then color display is achieved, but light utilization is reduced due to absorption of other wave bands
Solution Approach 1:
The patent changes the fundamental mechanism from absorption-based color filtering to emission-based color filtering using quantum dots. By changing the excitation wavelength and emission wavelength parameters, the system achieves high color purity while maintaining high light utilization efficiency, as the quantum dots convert specific wavelengths rather than absorbing broad spectra
Solution Approach 2:
The patent replaces the chemical absorption mechanism of dyes with the photophysical emission mechanism of quantum dots. This substitution eliminates the need for broad-spectrum absorption and enables selective wavelength conversion, thereby improving both color purity and light utilization efficiency
2Illumination intensity
If conventional color filters absorb light of other wave bands to display pure color light, then color purity is improved, but backlight utilization is greatly reduced
Solution Approach 1:
The patent changes the operating parameters from broad-spectrum absorption to narrow-band excitation and emission. By selecting specific excitation wavelengths that match quantum dot absorption peaks and utilizing their narrow emission spectra, the system achieves high color purity without sacrificing backlight utilization efficiency
Solution Approach 2:
The patent substitutes the absorption-based color separation mechanism with a photoluminescence-based mechanism. This replacement enables the system to achieve pure color output through wavelength conversion rather than absorption, thereby maintaining high productivity and backlight utilization
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 improves color purity and light utilization efficiency by reflecting unconverted light and absorbing excess wavelengths, resulting in higher image quality and better color gamut in display devices.
Implementation Method 1
The first quantum dots are configured to be stimulated by light of a first wavelength from the light incident surface to emit light of a second wavelength
Implementation Method 2
the first reflective layer is configured to transmit the light of the second wavelength and reflect the light of the first wavelength
Data Source
AI summary
A color filter, a method for manufacturing a color filter, a color filter substrate, and a display device are disclosed. The color filter includes a first quantum dot light emitting layer and a first reflective layer. The first quantum dot light emitting layer has a light incident surface; and the first reflective layer is on a side of the first quantum dot light emitting layer away from the light incident surface, the first quantum dot light emitting layer includes a plurality of first quantum dots, the first quantum dots are configured to be stimulated by light of a first wavelength from the light incident surface to emit light of a second wavelength, and the first reflective layer is configured to transmit the light of the second wavelength and reflect the light of the first wavelength.