Micro LED Display Assembly with Non-Uniform Electric Fields
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Solution Overview
Problem
Existing display devices face challenges in precisely positioning a large number of semiconductor light-emitting elements on a wiring substrate during assembly, leading to assembly errors and defects such as shorts or opens.
Innovation Solution
The use of non-uniform electric fields generated by specific arrangements of assembly electrodes, with a separation distance less than the semiconductor light-emitting element's width, allows precise positioning through self-assembly, minimizing assembly errors and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a very large number of semiconductor light-emitting elements are assembled on a wiring substrate, then the display device can be implemented with reduced element size, but it becomes very difficult to precisely position the elements at desired positions
Solution Approach 1:
The patent replaces manual or mechanical positioning methods with an electric field-based self-assembly system. Assembly electrodes generate electric fields that automatically position semiconductor light-emitting elements at desired locations without direct mechanical intervention, solving the positioning precision problem while reducing assembly complexity.
Solution Approach 2:
The semiconductor light-emitting elements are designed to self-assemble into correct positions through interaction with electric fields from assembly electrodes. The elements automatically orient and position themselves based on the electric field distribution, eliminating the need for complex external positioning mechanisms.
2Manufacturing precision
If assembly electrodes are positioned close together to generate strong electric fields, then positioning precision improves, but the risk of short circuits between electrodes increases
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between assembly electrodes. This layer prevents direct electrical contact and short circuits while allowing the electrodes to remain close together for generating strong electric fields needed for precise positioning.
Solution Approach 2:
The insulating layer is specifically positioned between assembly electrodes where electrical isolation is needed, while maintaining the close spacing of electrodes for electric field generation. This localized application of insulation solves the contradiction between field strength and electrical safety.
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 method enables precise assembly of semiconductor light-emitting elements, reducing defects and improving the manufacturing process efficiency of display devices.
Implementation Method 1
a non-uniform electric field is generated in an assembly hole by a specific arrangement of assembly electrodes, so that a semiconductor light-emitting element is precisely assembled at a specific position in the assembly hole
Data Source
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AI summary
Disclosed in the present specification are a micro LED display device in which an assembly electrode capable of forming a non-uniform electric field is assembled in a provided assembly hole, and a manufacturing method therefor. The display device according to one embodiment of the present invention comprises: a substrate; a first assembly electrode and a second assembly electrode arranged to be spaced apart on the substrate; an insulating layer deposited on top of the first assembly electrode and the second assembly electrode; an assembly hole defining a pixel area formed on the insulating layer; a semiconductor light-emitting element assembled in the assembly hole; and a wiring electrode electrically connected to the semiconductor light-emitting element, wherein the first assembly electrode and the second assembly electrode have a pattern for generating non-uniform electric field in the assembly hole by means of applied voltage, and the semiconductor light-emitting element is assembled, on the basis of the non-uniform electric field, at a specific location in the assembly hole after moving in a specific direction.