Quantum Dot Capping Structure for Stable Color Conversion Displays
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Solution Overview
Problem
In display manufacturing, color conversion units are susceptible to light and oxygen exposure, leading to a decrease in light conversion efficiency.
Innovation Solution
A display apparatus design featuring a first substrate with light-emitting diodes, an encapsulation layer, a bank layer, quantum dot layers, and capping layers, including organic and inorganic materials, which enhance light conversion efficiency by protecting the quantum dot layers from exposure and optimizing their thickness and shape for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dot layers are exposed to light and oxygen during manufacturing, then the manufacturing process is simple and fast, but light conversion efficiency decreases
Solution Approach 1:
The patent implements a nested capsule structure where an inner capsule (first capsule layer and second capsule layer) is placed inside an outer capsule (encapsulation layer). This multi-layer nested configuration provides progressive protection for the quantum dot layer, with each layer serving as an additional barrier against light and oxygen exposure, thereby maintaining high light conversion efficiency without requiring overly complex external structures.
Solution Approach 2:
The patent introduces a bank layer as an intermediary component between the quantum dot layer and the external environment. This bank layer acts as a mediator that provides an additional protective barrier, preventing direct exposure of the quantum dot layer to harmful light and oxygen while maintaining the overall structural integrity and simplicity of the display device.
2Reliability
If capping layers are added to protect quantum dot layers, then light conversion efficiency is maintained, but manufacturing complexity increases
Solution Approach 1:
The patent employs thin film capsule layers (first capsule layer and second capsule layer) that provide effective protection against light and oxygen exposure while maintaining flexibility in the manufacturing process. These thin film structures can be integrated into existing manufacturing workflows without requiring significantly complex additional steps, thus preserving ease of manufacture while ensuring reliability of light conversion efficiency.
3Manufacturing precision
If quantum dot layer thickness is optimized for performance, then image quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the thickness parameters of the quantum dot layer and capsule layers to achieve the desired light conversion efficiency and image quality. By carefully controlling these dimensional parameters within specific ranges, the patent maintains high manufacturing precision requirements while avoiding excessive structural complexity that would arise from more elaborate designs.
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 effectively maintains high light conversion efficiency and ensures the display apparatus can produce high-quality images by preventing the degradation of quantum dot layers due to light and oxygen exposure.
Implementation Method 1
a first quantum dot layer disposed in the first bank opening and which converts light of a wavelength belonging to a first wavelength band to light of a wavelength belonging to a second wavelength band; a second quantum dot layer disposed in the second bank opening and which converts light of a wavelength belonging to the first wavelength band to light of a wavelength belonging to a third wavelength band
Data Source
AI summary
Embodiments provide a display apparatus that includes a first substrate, a first light-emitting diode, a second light-emitting diode, and a third light-emitting diode, an encapsulation layer covering the first light-emitting diode, the second light-emitting diode, and the third light-emitting diode, a bank layer on the encapsulation layer, the bank layer including a first bank opening corresponding to the first light-emitting diode, a second bank opening corresponding to the second light-emitting diode, and a third bank opening corresponding to the third light-emitting diode, a first quantum dot layer disposed in the first bank, a second quantum dot layer disposed in the second bank opening, a first organic capping layer disposed in the second bank opening and covering the second quantum dot layer, and an inorganic capping layer covering the bank layer, the first quantum dot layer, and the second quantum dot layer.