OLED Display Device with Quantum Dot Package Layer
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Solution Overview
Problem
OLED display devices face challenges in achieving high color gamut and product competitiveness due to limitations in light emission efficiency and environmental sensitivity, such as vulnerability to water vapor and oxygen.
Innovation Solution
Incorporating a quantum dot package layer with alternately stacked organic and inorganic layers on top of blue OLEDs, where blue light emitted by the OLEDs excites quantum dot material to enhance color display gamut without adding additional structures, and using Ink-Jet Printing for uniform distribution of quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional display technologies are used, then the device structure remains simple, but the color gamut is limited and color reduction ability is insufficient
Solution Approach 1:
The patent combines OLED emission layers with quantum dot materials to create a hybrid light-emitting structure. The OLED provides the light source while quantum dots convert the light to achieve narrow emission spectra and high color purity, thereby expanding the color gamut without significantly increasing structural complexity
Solution Approach 2:
The OLED emission layer serves dual functions: as the light source for display and as the excitation source for quantum dots. This multi-functionality allows the system to achieve high color gamut through quantum dot conversion while maintaining the simplicity of the OLED structure
2Stability of the object's composition
If quantum dot materials are added to enhance color gamut, then color purity improves, but the device becomes more sensitive to environmental factors like water vapor and oxygen
Solution Approach 1:
The patent employs encapsulation layers in the form of thin films to protect the quantum dot materials and OLED structure from environmental degradation. These flexible thin film encapsulation layers provide effective barriers against water vapor and oxygen while maintaining the device's flexibility and not significantly increasing its thickness
Solution Approach 2:
The device structure combines OLED materials with quantum dot materials in a composite architecture, where each material is selected and positioned to optimize both color performance and environmental stability. The composite structure allows the quantum dots to benefit from the OLED's encapsulation while adding their color enhancement capabilities
3Reliability
If additional structures are added to protect OLED from environmental damage, then reliability improves, but the aperture ratio and light emitting efficiency decrease
Solution Approach 1:
The patent uses thin film encapsulation layers that provide effective environmental protection while occupying minimal space. These thin films offer sufficient barrier properties against water vapor and oxygen penetration, thereby extending device lifetime without significantly blocking light emission or reducing aperture ratio
Solution Approach 2:
The patent optimizes the thickness and material composition of encapsulation layers to achieve the right balance between protection and light transmission. By carefully controlling the parameters of the encapsulation layers, the device achieves improved reliability while maintaining high light emitting efficiency
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 achieves a high color gamut and increased product competitiveness by efficiently utilizing quantum dots to enhance light emission, while maintaining a simple structure and flexibility, and avoiding environmental sensitivity issues.
Implementation Method 1
the quantum dot material is distributed in regions of the quantum dot package layer correspondingly above the blue OLEDs; tops of the blue OLEDs emit blue light to excite the quantum dot material in the quantum dot package layer to emit light
Data Source
AI summary
An OLED display device includes a substrate, an OLED layer located on the substrate, and a quantum dot package layer covering the OLED layer. The quantum dot package layer includes a quantum dot material. Blue light or white light emitting from the OLED layer excites the quantum dot material of the quantum dot package layer to emit light for color displaying with high color gamut.