Quantum Dot Electroluminescence Display Color Purity
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Solution Overview
Problem
Existing organic electroluminescence displays face challenges with lower color purity and efficiency due to the use of inorganic doped system materials for color conversion, which restricts the enhancement of picture quality.
Innovation Solution
A quantum dot electroluminescence display device is designed with a monochromatic quantum dot layer on the light exiting side of sub-pixel units, utilizing quantum dots to emit monochromatic light after excitation by the electroluminescence structure, improving color purity and emission efficiency by scattering light and offering a narrow emission spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inorganic doped system materials are used for color conversion, then the display device can be manufactured with current technology, but color purity and emission efficiency are reduced
Solution Approach 1:
The patent changes the fundamental parameter of the color conversion material from inorganic doped system to quantum dot system. This parameter change enables superior color purity and emission efficiency while maintaining compatibility with existing electroluminescence display manufacturing processes, thus resolving the contradiction between ease of manufacture and color purity
Solution Approach 2:
The patent employs quantum dots as a composite material system that combines semiconductor nanocrystals with electroluminescence structures. This composite approach achieves high color purity and efficiency while being integrable into current display manufacturing frameworks
2Ease of manufacture
If inorganic doped system materials are used for color conversion, then the display device can be manufactured with current technology, but emission efficiency is reduced
Solution Approach 1:
The patent changes the material parameter from inorganic doped system to quantum dot system, which has inherently higher emission efficiency due to quantum confinement effects. This change reduces energy loss while maintaining manufacturability through established electroluminescence display fabrication techniques
Solution Approach 2:
The patent substitutes the conventional inorganic phosphor conversion mechanism with quantum dot photoluminescence conversion. This substitution leverages the superior optical properties of quantum dots, achieving higher emission efficiency and reduced energy loss while remaining compatible with existing manufacturing processes
3Manufacturing precision
If quantum dots are used for color conversion, then color purity and emission efficiency are improved, but the structure becomes more complex
Solution Approach 1:
The patent segments the quantum dot layer into discrete sub-pixel units (red, green, blue sub-pixels) within each pixel unit. This segmentation approach maintains high color purity for each sub-pixel while organizing the complex quantum dot structure into a manageable and manufacturable configuration that aligns with standard display pixel architectures
4Manufacturing precision
If quantum dots are used for color conversion, then color purity and emission efficiency are improved, but the device becomes more sensitive to environmental factors
Solution Approach 1:
The patent incorporates protective encapsulation layers and optimized substrate structures before the quantum dot layer to cushion and protect against environmental factors such as shock and temperature variations. This beforehand protection allows the quantum dot-based display to maintain high color purity and emission efficiency while achieving improved environmental robustness
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 quantum dot electroluminescence display device enhances color purity and emission efficiency, leading to improved display quality and increased transmittance compared to traditional inorganic doped system materials, while also being more robust and resistant to shock and temperature variations.
Implementation Method 1
a monochromatic quantum dot layer 03 that is disposed in at least one sub-pixel unit of a color of each pixel unit and is located on a light exiting side of the electroluminescence structure of the at least one sub-pixel unit of a color, for emitting monochromatic light corresponding to the color of the sub-pixel unit after it is excited by light emitted from the electroluminescence structure
Data Source
AI summary
A quantum dot electroluminescence display device and display apparatus are provided, and a electroluminescence structure (02) is provided in sub-pixel units of different colors of each pixel unit, a monochromatic quantum dot layer (03) is provided in at least one sub-pixel unit of a color of each pixel unit and located on a light exiting side of the electroluminescence structure of the at least one sub-pixel unit of a color, and the monochromatic quantum dot layer (03) emits monochromatic light corresponding to the color of sub-pixel unit after it is excited by light emitted from the electroluminescence structure (02).