QLED Pixel Electrode Layout Without Partition Walls
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Solution Overview
Problem
The provision of a partition wall in quantum-dot light-emitting diode (QLED) display devices reduces the area of the light-emitting layer, leading to a lower aperture ratio and luminance.
Innovation Solution
A display device design where the first and second pixel electrodes are made of different metal materials, with ferritin encaging quantum dots modified by specific peptides, eliminating the need for a partition wall and allowing for high aperture ratio and luminance by selectively positioning quantum dots on the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a partition wall is provided to separate adjacent light-emitting layers, then the quantum dots can be selectively positioned, but the area of the light-emitting layer is reduced
Solution Approach 1:
The patent removes the partition wall structure from the display device design. Instead of using physical walls to separate light-emitting layers, the invention relies on the selective binding between metal materials on pixel electrodes and specific quantum dots functionalized with corresponding ligands, thereby eliminating the need for partition walls and maximizing the light-emitting area.
Solution Approach 2:
The patent introduces metal materials on pixel electrodes as intermediaries that enable selective positioning of quantum dots through specific metal-ligand binding. This intermediary mechanism replaces the need for physical partition walls, allowing quantum dots to be precisely positioned on intended pixel electrodes through chemical affinity rather than physical confinement.
2Reliability
If a partition wall is provided to separate adjacent light-emitting layers, then contamination between layers can be prevented, but the aperture ratio is reduced
Solution Approach 1:
The patent extracts and removes the partition wall structure, relying instead on the selective metal-ligand binding affinity to prevent contamination between adjacent light-emitting layers. This approach maintains layer separation and prevents quantum dot contamination without sacrificing aperture ratio.
Solution Approach 2:
The metal materials on pixel electrodes serve as intermediaries that provide selective binding sites for quantum dots. This intermediary mechanism ensures that quantum dots are attracted only to their intended pixel electrodes with matching metal-ligand pairs, preventing cross-contamination between adjacent layers without requiring physical barriers.
3Stability of the object's composition
If a partition wall is provided to separate adjacent light-emitting layers, then the structure is stable, but the luminance is reduced
Solution Approach 1:
The patent removes the partition wall structure while maintaining structural stability through the metal-ligand binding mechanism. The elimination of partition walls increases the light-emitting area and thus the luminance, while the specific binding between metals and quantum dots provides the necessary structural organization and stability.
Solution Approach 2:
The metal materials on pixel electrodes act as intermediaries that provide both structural organization and selective binding functionality. This intermediary system maintains the stability of the light-emitting layer composition through specific metal-ligand interactions while maximizing the light-emitting area for enhanced luminance.
4Manufacturing precision
If different metal materials are used on pixel electrodes, then selective binding of quantum dots is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies different metal materials to different pixel electrodes, creating local variations in binding affinity. Each pixel electrode has a specific metal material that selectively binds to quantum dots with matching ligands, enabling precise spatial control of quantum dot positioning through localized material properties.
Solution Approach 2:
The patent changes the material parameter (metal type) of pixel electrodes to achieve selective binding. By varying the metal material composition across different pixel electrodes, the invention creates distinct binding characteristics that enable selective quantum dot positioning without requiring complex structural modifications.
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
This design achieves a high luminance display device by eliminating the need for a partition wall, enhancing the aperture ratio and preventing contamination of light-emitting layers with unwanted quantum dots.
Implementation Method 1
ferritin encaging the first quantum dot
Implementation Method 2
modified with a first peptide bound to the first pixel electrode
Implementation Method 3
the first pixel electrode has a surface made of a first metal material, and the second pixel electrode has a surface made of a second metal material of a different type
Data Source
AI summary
A display device includes: ferritin encaging a first quantum dot and modified with a first peptide bound to a first pixel electrode; and ferritin encaging a second quantum dot and modified with a second peptide bound to a second pixel electrode. A first metal material and a second metal material are of different types.