Display Panel Color Conversion Stack for Quantum Dot Heat Protection
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Solution Overview
Problem
Display panels with light emitting devices face damage to color conversion layers due to heat generated, leading to reduced color purity and device reliability.
Innovation Solution
A display panel design incorporating light emitting members with a first color conversion layer, a light scattering layer, and a second color conversion layer, where the first color conversion layer absorbs light and reduces exposure of quantum dots in the second color conversion layer to heat, using phosphors and quantum dots to convert light into different color wavelengths, and a protective layer to seal the quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting devices are used to display images, then light efficiency and brightness are improved, but heat is generated causing damage to color conversion layers and reducing device reliability
Solution Approach 1:
The color conversion layer is divided into two separate layers: a first color conversion layer containing phosphors and a second color conversion layer containing quantum dots. This segmentation allows the heat-absorbing phosphors to be positioned between the light emitting device and the heat-sensitive quantum dots, protecting the quantum dots from thermal damage while maintaining color conversion efficiency.
Solution Approach 2:
The first color conversion layer acts as an intermediary between the light emitting device and the second color conversion layer. It absorbs a portion of the light and converts it to different wavelengths, thereby reducing the amount of high-energy light reaching the quantum dots and decreasing heat exposure to this sensitive layer.
2Manufacturing precision
If quantum dots are used in the color conversion layer, then color purity is improved, but they are damaged by heat from light emitting devices
Solution Approach 1:
The color conversion layer is divided into two separate layers: a first color conversion layer containing phosphors and a second color conversion layer containing quantum dots. This segmentation allows the heat-absorbing phosphors to be positioned between the light emitting device and the heat-sensitive quantum dots, protecting the quantum dots from thermal damage while maintaining color conversion efficiency.
Solution Approach 2:
The first color conversion layer is positioned beforehand to cushion or absorb heat from the light emitting device before it reaches the quantum dots. This protective layer acts as a thermal barrier, reducing heat-induced damage to the quantum dots and preserving their color purity over time.
3Device complexity
If a single color conversion layer is used, then device complexity is reduced, but color purity and heat protection are insufficient
Solution Approach 1:
The color conversion layer is divided into two separate layers: a first color conversion layer containing phosphors and a second color conversion layer containing quantum dots. This segmentation allows the heat-absorbing phosphors to be positioned between the light emitting device and the heat-sensitive quantum dots, protecting the quantum dots from thermal damage while maintaining color conversion efficiency.
Solution Approach 2:
The display panel employs a composite color conversion structure combining two different materials: phosphors in the first layer and quantum dots in the second layer. This composite approach leverages the heat-absorbing properties of phosphors and the high color purity of quantum dots to achieve both thermal protection and superior color 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
This design improves color purity and extends the lifespan of the display panel by reducing heat-induced damage to quantum dots, enhancing device reliability and light efficiency.
Implementation Method 1
a first color conversion layer disposed on the light emitting device and including phosphors converting a portion of light of the light emitting device into a wavelength region higher than a wavelength region of the light of the light emitting device
Implementation Method 2
a light scattering layer disposed on the first color conversion layer and scattering another portion of the light of the light emitting device or light of the first color conversion layer
Implementation Method 3
a second color conversion layer disposed on the light scattering layer and including quantum dots converting still another portion of the light of the light emitting device or the another portion of the light scattered by the light scattering layer into a wavelength region of the one of two or more different colors which the one of the light emitting members corresponds
Data Source
AI summary
A display panel includes a plurality of light emitting members disposed on a substrate, each disposed on a plurality of emission areas of the substrate and a bank. Each of the plurality of light emitting members corresponds to one of two or more different colors. One of the plurality of light emitting members includes a light emitting device, a first color conversion layer disposed on the light emitting device and including phosphors converting a portion of light of the light emitting device, a light scattering layer disposed on the first color conversion layer, and a second color conversion layer disposed on the light scattering layer and including quantum dots converting still another portion of the light of the light emitting device or light scattered by the light scattering layer into a wavelength region of a color corresponding to the one light emitting member.