Light-Emitting Nanorod Electrode Layout for Self-Alignment
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Solution Overview
Problem
The process time and yield are increased in display devices using light emitting nanorods due to individual growth and transfer of red, green, and blue nanorods, limiting size reduction.
Innovation Solution
A display device with self-aligning light emitting nanorods connected to first and second electrodes, featuring protrusions on the electrodes for easy alignment, and a manufacturing method involving a direct current application to align nanorods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting nanorods are individually grown and transferred to display panel, then alignment precision can be achieved, but process time increases and yield decreases
Solution Approach 1:
The patent combines multiple nanorod transfer operations into a single batch process. Instead of transferring red, green, and blue nanorods separately in individual steps, the invention transfers all nanorod types simultaneously in one batch operation, significantly reducing total process time while maintaining alignment precision through the batch transfer mechanism
Solution Approach 2:
The patent prepares alignment structures (protrusions or recesses) on the substrate before nanorod transfer. These pre-formed alignment features guide the nanorods into correct positions during the batch transfer process, ensuring high alignment precision is achieved without requiring individual nanorod positioning steps
2Manufacturing precision
If light emitting nanorods are individually transferred, then alignment can be controlled, but size reduction of nanorods is limited
Solution Approach 1:
The batch transfer process allows simultaneous handling of multiple nanorods including extremely small-sized nanorods. By combining all nanorods in a single transfer operation rather than individual transfers, the invention overcomes the limitation on minimum nanorod size that exists in individual transfer methods
Solution Approach 2:
The patent introduces an intermediary batch transfer mechanism that mediates between the nanorods and the substrate. This batch transfer intermediary allows even very small nanorods to be positioned accurately by utilizing the collective alignment features rather than requiring individual nanorod manipulation
3Manufacturing precision
If protrusions are formed on electrodes, then alignment accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies protrusions or recesses only at specific critical locations on the electrodes where nanorod alignment is required, rather than modifying the entire electrode structure. This localized modification approach maintains high alignment accuracy at key positions while minimizing overall device complexity
Solution Approach 2:
The alignment protrusions or recesses create asymmetric features on the electrode surfaces. These asymmetric structures provide directional guidance for nanorod alignment, improving alignment accuracy through the asymmetric geometry while adding minimal structural complexity
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
Simplifies the manufacturing process, reduces costs, and improves alignment accuracy by concentrating current on electrode protrusions.
Implementation Method 1
self-aligning light emitting nanorods by applying a direct current to the first electrode layer and the second electrode layer
Implementation Method 2
the self-alignment can be more easily achieved by forming protrusions on the first electrode and/or the second electrode connected to the light emitting nanorods
Data Source
AI summary
According to an aspect of the present disclosure, a display device having a plurality of pixels each including a plurality of sub-pixels, includes a first substrate; a plurality of first pads disposed on the first substrate in the plurality of sub-pixels; a common pad disposed on the first substrate and shared by the plurality of sub-pixels; a second substrate disposed to face the first substrate; a plurality of first electrodes disposed on the second substrate and connected to the plurality of first pads; a second electrode disposed on the second substrate and connected to the common pad; and a plurality of light emitting nanorods having one ends and the other ends respectively connected to the plurality of first electrodes and the second electrode. Therefore, self-aligning of the light emitting nanorods can be easily achieved.