Magnetic Adsorption Device for Micro LED Transfer

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Solution Overview

Problem

In the manufacturing process of micro LED display devices, existing electrostatic attraction methods can damage the circuit on the substrate during the transfer of LEDs, necessitating a more reliable and safe transfer method.

Innovation Solution

An adsorption device utilizing magnetic forces, with a substrate having magnetic poles and a magnetic film generating a counter-magnetic field, allows for precise adsorption and transfer of small-sized LEDs, avoiding damage to the substrate circuit by using through holes and anisotropic conductive adhesive for secure attachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If electrostatic attraction method is used to transfer LEDs, then the LEDs can be held and transferred to the substrate, but the electrostatic charge may damage the circuit on the substrate

Engineering Contradiction:

ImproveLED transfer efficiencyVSAvoidelectrostatic damage to circuit

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the electrostatic attraction method with a magnetic field-based adsorption system. The substrate includes a magnetic film that generates a magnetic field to adsorb magnetized LEDs, eliminating the need for electrostatic charges that could damage the circuit while maintaining effective transfer capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical parameter used for adsorption from electrostatic charge to magnetic field strength. By controlling the magnetic field parameters through the magnetic film, the system achieves secure LED adsorption during transfer without introducing harmful electrostatic effects to the substrate circuit

Inventive Principle:

Principle #35Parameter changes

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

The magnetic adsorption device enables efficient and damage-free transfer of a large number of LEDs onto the substrate, enhancing manufacturing efficiency, particularly for mini and micro LEDs, by using magnetic forces and anisotropic conductive adhesives to secure the LEDs without harming the substrate circuit.

Implementation Method 1

the adsorption device 10 includes a substrate 11 and a magnetic film 12 on a surface 111 of the substrate 11... the surface 111 of the substrate 11 is configured to adsorb target objects which are magnetized

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

configured for adsorbing target objects by magnetic force

Methodology Applied

Scientific EffectMagnetism: Magnetism

Data Source

PatentUS11521878B2Adsorption device, transferring system having same, and transferring method using same

Publication Date: 2022.12.06 CENTURY TECH (SHENZHEN) CORP LTD

AI summary

An adsorption device includes a substrate and a magnetic film on a surface of the substrate. The substrate has magnetic properties and is capable of generating magnetic field. The magnetic film partially covers the surface. The magnetic film generates a magnetic field having a direction that is opposite to a direction of the magnetic field generated by the substrate. Portions of the surface of the substrate not covered by the magnetic film form positions to attract and adsorb target objects, and other portion of the surface of the substrate covered by the magnetic film is not able to attract any target object.