Micro LED Assembly Electrodes for Precise Pixel Positioning
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Solution Overview
Problem
The challenge lies in precisely positioning semiconductor light-emitting elements during the assembly process in display devices, as existing methods struggle to accurately place a large number of these elements on a wiring substrate due to size limitations and differences in width between the elements and assembly holes, leading to assembly errors and defects in subsequent processes.
Innovation Solution
A display device and manufacturing method that utilize a substrate with first and second assembly electrodes, an insulating layer, and assembly holes to generate a non-uniform electric field, allowing semiconductor light-emitting elements to be moved and assembled at specific positions within the holes using the electric field, ensuring precise positioning and minimizing assembly errors.
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 introduces an intermediary electric field generated by assembly electrodes as a mediator to position the semiconductor light-emitting elements. The electric field acts as a force field that guides and positions the elements at desired locations on the substrate, solving the positioning difficulty without requiring complex mechanical assembly mechanisms.
Solution Approach 2:
The patent replaces traditional mechanical positioning methods with an electric field-based positioning system. Instead of using complex mechanical fixtures or manual positioning for each element, the invention uses electric fields generated by assembly electrodes to automatically position the semiconductor light-emitting elements, thereby reducing assembly complexity while maintaining high positioning precision.
2Manufacturing precision
If there is a difference in width between the semiconductor light-emitting elements and the assembly holes, then the elements can be manufactured with precise dimensions, but assembly errors occur during the assembly process
Solution Approach 1:
The patent changes the parameter of the electric field (from uniform to non-uniform) to enable precise positioning. By creating a non-uniform electric field through specifically designed assembly electrodes, the system can exert different forces on elements with different widths, guiding them to the correct positions and reducing assembly errors despite dimensional differences between elements and holes.
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 enables precise assembly of semiconductor light-emitting elements, reducing assembly errors and defects such as shorts or opens, while allowing for the creation of high-quality, flexible display devices with improved pixel density and image quality.
Implementation Method 1
the first assembly electrode and the second assembly electrode have a pattern to generate a non-uniform electric field in the assembly hole by an applied voltage
Data Source
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.