Maskless Quantum Dot Deposition via Electrostatic Attraction
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Solution Overview
Problem
The existing methods for manufacturing quantum dots layers in display devices require the use of fine metal masks, which can warp and make it difficult to produce large display devices, increasing process costs and material wastage.
Innovation Solution
A method for manufacturing quantum dots layers without a mask, involving a substrate with spaced electrodes, mixed solutions of surface-treated quantum dots with polar materials, and specific polarity applications to selectively deposit quantum dots layers that emit red, green, and blue light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If quantum dots are deposited by using a fine metal mask, then the quantum dots layer can be formed with precise pattern, but the mask may be warped as the mask area is widened, making it more difficult to manufacture large display devices
Solution Approach 1:
The patent removes the mask component entirely from the deposition system, replacing it with a maskless deposition approach that uses a shadow mask formed by the device structure itself (electrodes and insulating layers) to define the quantum dot pattern, enabling large-area deposition without mask warping
Solution Approach 2:
The patent introduces an insulating layer as an intermediary structure that serves dual purposes: electrical insulation and mechanical shadow masking. This insulating layer with openings allows quantum dots to be deposited only in specific regions without requiring a separate physical mask
2Manufacturing precision
If quantum dots are deposited by using a fine metal mask, then the quantum dots layer can be formed with precise pattern, but material is wasted to increase process cost
Solution Approach 1:
The patent eliminates the physical mask that consumes material, replacing it with a maskless deposition method where the shadow pattern is created by the device's own structural layers, thereby eliminating material waste associated with mask fabrication and disposal
Solution Approach 2:
The device structure itself (electrodes and insulating layers) serves as the shadow mask, making the system self-defining without requiring external masking materials. The insulating layer patterns are formed by standard semiconductor fabrication processes and then serve to define the quantum dot deposition areas
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 the production of large display devices with reduced process costs and material wastage by eliminating the need for masks, while maintaining efficient light emission characteristics.
Implementation Method 1
providing a second polarity opposite to the first polarity to the first electrode; disposing the first quantum dots on the first electrode on which the second polarity is provided
Data Source
AI summary
A method for manufacturing a quantum dots layer including providing a substrate on which a first electrode, a second electrode, and a third electrode are disposed; providing a first mixed solution including a first quantum dots, which have been surface-treated to have a first polarity, on the first to third electrodes; providing a second polarity opposite to the first polarity to the first electrode resulting in deposition of the first quantum dots on the first electrode; and drying the first mixed solution to form a first quantum dots layer.