Buffer Layer Encapsulation for Quantum Dot Display Stability
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Solution Overview
Problem
Quantum dot materials in display panels are susceptible to degradation due to reactions with water and oxygen, leading to reduced light efficiency and stability, which affects the display performance and user experience.
Innovation Solution
A display panel design with an optimized encapsulation module, featuring a buffer layer and encapsulation layers to protect quantum dot units, along with a quantum dot pixel definition layer to prevent damage and enhance encapsulation, ensuring stability and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation process using metal-organic precursor or plasma bombardment is performed on the quantum dot unit, then encapsulation protection is achieved, but surface damage and ligand dissociation of the quantum dot material occur, reducing light-emitting efficiency and stability
Solution Approach 1:
The encapsulation module is divided into three distinct layers: a lower encapsulation layer, a buffer layer, and an upper encapsulation layer. The buffer layer is specifically positioned between the quantum dot layer and the upper encapsulation layer to prevent direct contact and chemical reactions. This segmentation allows the encapsulation function to be achieved while protecting the quantum dot material from damage.
Solution Approach 2:
The buffer layer acts as an intermediary between the quantum dot layer and the upper encapsulation layer. It prevents direct chemical reactions between the metal-organic precursor/plasma and the quantum dot material, thereby avoiding surface damage and ligand dissociation while still allowing the encapsulation process to proceed.
2Reliability
If high-energy plasma is used for encapsulation, then encapsulation effect is enhanced, but free radical reactions cause irreversible damage to the quantum dot material
Solution Approach 1:
The buffer layer is placed in advance between the quantum dot layer and the upper encapsulation layer to prevent harmful free radical reactions from reaching the quantum dot material. This preliminary protective measure ensures that even when high-energy plasma is used for encapsulation, the quantum dot material remains intact and undamaged.
3Ease of manufacture
If the quantum dot material is exposed to water and oxygen, then encapsulation is not needed, but the quantum dot material reacts with water and oxygen generating charged states that reduce light efficiency
Solution Approach 1:
The encapsulation module creates an inert protective environment around the quantum dot material through multiple layers including the buffer layer and upper/lower encapsulation layers. This inert environment prevents water and oxygen from reaching and reacting with the quantum dot material, thereby maintaining light efficiency and stability without requiring complex additional processes.
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 encapsulation structure improves the stability and efficiency of quantum dot units, enhancing the display panel's performance and extending its service life by preventing water and oxygen erosion.
Implementation Method 1
light emitted by the LED excites a material of the quantum dot unit to emit light, and a wavelength of the light is converted
Implementation Method 2
The buffer layer is configured to protect the plurality of quantum dot units... prevent water and oxygen in an environment from eroding each functional structure inside the display panel
Data Source
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AI summary
This application provides a display panel, including a substrate, a backlight module, a color conversion module, and an encapsulation module that are sequentially stacked. The backlight module includes a plurality of LED light-emitting units that are spaced, and a dimension of each LED light-emitting unit ranges from 1 µm to 50 µm. The color conversion module includes a plurality of quantum dot units that are disposed in a one-to-one correspondence with the plurality of LED light-emitting units, and each quantum dot unit is configured to convert a wavelength of light emitted by a corresponding LED light-emitting unit. The encapsulation module includes an encapsulation layer and a buffer layer. The encapsulation layer covers the color conversion module. The buffer layer is located between the encapsulation layer and the color conversion module. A size of the buffer layer is greater than a size of the plurality of quantum dot units. The buffer layer is configured to protect the plurality of quantum dot units. In this application, the buffer layer is used to separate the quantum dot unit and the encapsulation layer in the display panel, to improve light-emitting efficiency of the quantum dot unit and improve display effect of the display panel. This application further provides an electronic device.