Semiconductor LED Display Cells for Mask-Free Electric-Field Transfer
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Solution Overview
Problem
Current display technologies, such as LCDs and AMOLEDs, face challenges including slow response time, limited flexibility, short lifespan, and low yield, while semiconductor light-emitting elements struggle to implement large-sized flexible displays effectively.
Innovation Solution
A display device structure and manufacturing process that utilizes an electric field formed between electrode lines to transfer semiconductor light-emitting elements onto a wiring substrate, with a partition wall made of polymer material covering part of the electrode, allowing for improved assembly efficiency and selective transfer of red, green, and blue elements without additional masking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor light-emitting elements are used to implement flexible displays, then flexibility and response time are improved, but it is difficult to implement large-sized display devices
Solution Approach 1:
The patent divides the display device into multiple cells arranged in a matrix structure, with each cell containing individual semiconductor light-emitting elements. This segmentation allows the display to be constructed in modular units that can be scaled to large sizes while maintaining the flexibility advantages of semiconductor LEDs.
Solution Approach 2:
The patent introduces a partition wall structure as an intermediary element between electrode lines to enable precise electric field formation for transferring semiconductor light-emitting elements. This mediator facilitates the assembly process for large-scale displays by enabling controlled element placement across extended areas.
2Ease of manufacture
If transfer processes are used to assemble semiconductor light-emitting elements, then assembly is enabled, but transfer precision and assembly efficiency are reduced
Solution Approach 1:
The patent forms partition walls between electrode lines in advance, before the transfer process. These pre-formed partition walls create defined electric field regions that guide the precise placement of semiconductor light-emitting elements during transfer, thereby improving transfer precision without complicating the assembly process.
Solution Approach 2:
The patent replaces mechanical transfer methods with electric field-based transfer. By forming electric fields through electrode lines and partition walls, semiconductor light-emitting elements are transferred and positioned precisely without mechanical contact, improving both transfer precision and assembly efficiency.
3Manufacturing precision
If additional masking processes are used for selective transfer of colored elements, then selective placement is achieved, but process complexity and manufacturing steps increase
Solution Approach 1:
The patent enables semiconductor light-emitting elements to self-align and self-position through electric field attraction. The electric fields formed by electrode lines and partition walls automatically guide elements to their correct positions without requiring external masking or complex alignment processes, achieving selective transfer with reduced process complexity.
Solution Approach 2:
The patent uses electric field parameters (strength, distribution, timing) to control the selective transfer of different colored semiconductor light-emitting elements. By adjusting electric field parameters rather than using physical masks, the process achieves selective placement while reducing manufacturing 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
This approach enhances the assembly efficiency of semiconductor light-emitting elements and improves transfer precision, enabling the creation of flexible, high-definition displays with improved luminance characteristics and reduced transfer processes.
Implementation Method 1
a display device including a substrate with a plurality of cells and a flip-chip type semiconductor light emitting element having a ferromagnetic material provided in each of the cells
Implementation Method 2
light-emitting diodes (LEDs) are well known light-emitting elements for converting an electrical current to light
Data Source
Figure 1
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Figure 3A~3B
AI summary
The present invention relates to a display device and a manufacturing method therefor and, particularly, to a display device using a semiconductor light-emitting element. The display device according to the present invention comprises: multiple cells comprising a substrate and a partition wall protruding from the substrate and sequentially arranged along one direction thereof; a semiconductor light-emitting element contained in each of the multiple cells; and a first electrode which includes multiple electrode lines arranged on the bottom of each of the cells and is electrically connected to the semiconductor light-emitting element, wherein the bottom of each of the cells comprises a first area covered with the multiple electrode lines and a second area formed between the electrode lines.