Quantum Dot Color Conversion Layer With Foam Particle Light Scattering
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Solution Overview
Problem
Current display modules using quantum dots face challenges in maintaining luminance due to light absorption and surface damage from scattering particles, leading to reduced light conversion efficiency over time.
Innovation Solution
Incorporating foam particles and a controlled amount of scattering particles within color conversion layers, these layers are designed to scatter light emitted from self-luminescence elements, reducing light loss and minimizing surface damage to quantum dots, while maintaining high luminance over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scattering particles are included in the color conversion layer to scatter light, then light scattering performance is improved, but quantum dots suffer surface damage and light conversion efficiency decreases over time
Solution Approach 1:
The patent introduces foam particles as an intermediary substance between the quantum dots and scattering particles. These foam particles perform the light scattering function while protecting the quantum dots from direct contact with harmful scattering particles, thus maintaining both scattering performance and quantum dot integrity over time
Solution Approach 2:
The patent utilizes foam particles with porous structures to achieve light scattering. The porous nature of the foam particles provides scattering capability while their material composition remains chemically inert toward quantum dots, preventing surface damage and maintaining stability
2Ease of manufacture
If quantum dots absorb light from self-luminescence elements, then color conversion is achieved, but luminance is reduced due to light absorption losses
Solution Approach 1:
The patent implements a multi-layer color conversion structure where foam particles scatter light continuously across multiple interfaces, and quantum dots perform sequential color conversions. This continuous light interaction pathway maximizes light utilization and reduces energy loss while achieving desired color output
3Illumination intensity
If a plurality of scattering particles are included in the color conversion layer, then light scattering is enhanced, but the lifespan of the display is reduced due to quantum dot degradation
Solution Approach 1:
The foam particles serve as a protective intermediary layer that maintains the separation between scattering particles and quantum dots. This intermediary structure enables sustained light scattering performance while preventing the degradation mechanisms that would otherwise reduce display lifespan
Solution Approach 2:
The patent creates a composite color conversion layer combining foam particles, scattering particles, and quantum dots in a structured arrangement. This composite material approach allows each component to perform its specific function while the overall structure protects the vulnerable quantum dots from degradation
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 display module achieves a luminance maintenance rate of greater than 90% for a longer duration by effectively scattering light and reducing the impact of scattering particles on quantum dots, thus enhancing light conversion efficiency and extending the lifespan of the display.
Implementation Method 1
a first color conversion layer configured to be disposed on the first self-luminescence element, and comprise a plurality of first quantum dots to absorb the light of the first wavelength emitted from the first self-luminescence element, and emit a light of a second wavelength band
Implementation Method 2
quantum dots absorb a light emitted by self-luminescence elements included in a display module, and then emit a light of a different wavelength area from the absorbed light
Implementation Method 3
the first color conversion layer and the second color conversion layer include a plurality of foam particles configured to scatter the light emitted from the first self-luminescence element and the light emitted from the second self-luminescence element
Data Source
AI summary
Provided is a display module including a substrate, and a plurality of pixels on the substrate, wherein each of the plurality of pixels includes a first self-luminescence element, a second self-luminescence element, and a third self-luminescence element respectively configured to emit light of a first wavelength band, a first color conversion layer configured to be disposed on the first self-luminescence element, and include a plurality of first quantum dots to absorb the light of the first wavelength emitted from the first self-luminescence element, and emit a light of a second wavelength band and second color conversion layer configured to be disposed on the second self-luminescence element, and comprise a plurality of second quantum dots to absorb the light of the first wavelength emitted from the second self-luminescence element, and emit a light of a third wavelength band, wherein the first color conversion layer and the second color conversion layer include a plurality of foam particles configured to scatter the light emitted from the first self-luminescence element and the light emitted from the second self-luminescence element.