QLED Base Plate with Wettability-Tuned Sub-Pixels for Template-Free Patterning
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Solution Overview
Problem
Current methods for patterning quantum dots in Quantum Dot Light Emitting Diodes (QLEDs) require high-accuracy templates and are costly, limiting the efficiency and scalability of large-area transfer printing.
Innovation Solution
A displaying base plate with sub-pixels having different luminous colors, each comprising a quantum-dot layer and inorganic layer modified by specific radical groups and ligands with unique wettabilities, allowing for large-area transfer printing without traditional templates by utilizing the different wettabilities of the surfaces for quantum-dot layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-accuracy templates are used for quantum dot patterning, then manufacturing precision is improved, but device complexity and production cost increase
Solution Approach 1:
The quantum dots self-assemble into desired patterns through wettability-directed self-assembly. The substrate is functionalized with regions of different wettability, and quantum dots automatically position themselves on appropriate regions based on their surface properties, eliminating the need for external templates or complex patterning equipment.
Solution Approach 2:
The invention changes the surface energy parameters of substrate regions by applying different wettability treatments (hydrophilic, hydrophobic, lipophilic, lipophobic coatings). This parameter modification creates distinct zones that selectively attract quantum dots with matching surface characteristics, enabling precise patterning without physical templates.
2Manufacturing precision
If traditional template-based transfer printing is used, then quantum dot patterning is achieved, but production cost and process complexity increase
Solution Approach 1:
The system uses self-service patterning where quantum dots autonomously locate and attach to designated substrate regions through wettability matching. This eliminates the need for expensive, complex template systems and multiple alignment steps, dramatically simplifying the manufacturing process while maintaining high pattern accuracy.
Solution Approach 2:
The invention extracts and eliminates the template component from the transfer printing process. Instead of using physical templates to guide quantum dot placement, the substrate itself is modified to provide direct spatial guidance through wettability patterns, removing the intermediate template element and simplifying the overall process.
3Productivity
If large-area transfer printing is implemented without specialized templates, then productivity and scalability are improved, but manufacturing precision may deteriorate
Solution Approach 1:
The substrate is divided into regions with locally distinct wettability properties. Each region has specific surface characteristics that selectively attract quantum dots with matching surface energy, ensuring high placement precision across large areas without requiring template-based control for each individual dot.
Solution Approach 2:
Quantum dots automatically navigate and position themselves on the substrate based on wettability gradients and matching. This self-positioning mechanism maintains high precision across large substrate areas without requiring complex template systems or multiple printing passes, enabling scalable production.
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
Enables efficient and cost-effective large-area transfer printing of quantum-dot patterns, reducing production costs and improving the scalability of QLED displays without the need for high-accuracy templates.
Implementation Method 1
a wettability of the first radical group and a wettability of the first ligand are the same; a wettability of the second radical group and a wettability of the second ligand are the same; and a wettability of the third radical group and a wettability of the third ligand are the same
Data Source
AI summary
A displaying base plate including multiple pixels. The first sub-pixel includes a first electrode, a first inorganic layer and a first quantum-dot layer sequentially stacked; the first inorganic layer includes a first inorganic material modified by a first group, and the first quantum-dot layer includes a first quantum dot modified by a first ligand; the second sub-pixel includes a second electrode, a second inorganic layer and a second quantum-dot layer sequentially stacked; the second inorganic layer includes a second inorganic material modified by a second group, and the second quantum-dot layer includes a second quantum dot modified by a second ligand; the third sub-pixel includes a third electrode, a third inorganic layer and a third quantum-dot layer sequentially stacked; and the third inorganic layer includes a third inorganic material modified by a third group, and the third quantum-dot layer includes a third quantum dot modified by a third ligand.