LCD-Based 3D Printing for Microfluidic Channel Fabrication

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Solution Overview

Problem

Conventional microfluidic device fabrication using lithography and PDMS micro-molding is costly, time-consuming, and requires high-end equipment and cleanroom facilities, making it unsuitable for economical production of microfluidic devices for biomedical applications.

Innovation Solution

Employing a liquid crystal display (LCD) based Vat Photopolymerization (VPP) 3D printer to fabricate microfluidic devices with multi-depth channels, optimizing curing time, temperature, and spin coating to achieve high resolution and versatility in channel dimensions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional lithography and PDMS micro-molding are used, then manufacturing precision is achieved, but device complexity and cost increase significantly

Engineering Contradiction:

Improvechannel dimension precisionVSAvoidfabrication process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces the complex mechanical lithography system with an LCD-based photopolymerization system that uses light patterns projected through a liquid crystal display to directly cure resin into microchannel structures, eliminating the need for physical masks, molds, and cleanroom facilities

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental fabrication parameter from mechanical contact-based patterning to light-based selective curing, using varying exposure times and light intensities through the LCD to achieve different channel depths and dimensions in a single printing process

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If conventional lithography and PDMS micro-molding are used, then manufacturing precision is achieved, but production time increases

Engineering Contradiction:

Improvechannel dimension precisionVSAvoidfabrication speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent performs preliminary digital modeling and LCD pattern generation before printing, allowing the fabrication process to proceed directly to selective photopolymerization without intermediate mask alignment or mold preparation steps, significantly reducing total fabrication time

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables continuous layer-by-layer photopolymerization where each layer is cured immediately after resin deposition, maintaining continuous productive action throughout the fabrication process without the interruptions inherent in conventional batch processing methods

Inventive Principle:

Principle #20Continuity of useful action

3Manufacturing precision

If conventional lithography and PDMS micro-molding are used, then manufacturing precision is achieved, but equipment requirements and operational complexity increase

Engineering Contradiction:

Improvechannel dimension precisionVSAvoidfabrication accessibility

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent uses disposable photopolymerizable resin and standard LCD displays, replacing expensive reusable equipment like cleanrooms, photolithography aligners, and PDMS bonding apparatus, making the system accessible to ordinary laboratories without specialized facilities

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent employs an LCD display that can be programmed to generate various channel patterns, depths, and geometries through software control, making a single device capable of fabricating multiple different microfluidic designs without requiring specialized equipment for each configuration

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 LCD-based 3D printer enables the rapid and cost-effective fabrication of microfluidic channels with resolutions down to 35 μm horizontally and 10 μm vertically, demonstrating its suitability for various biomedical applications, including cell manipulation and diagnosis.

Implementation Method 1

Employing a liquid crystal display (LCD) based Vat Photopolymerization (VPP) 3D printer to fabricate microfluidic devices

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS20250135453A1Rapid and low-cost fabrication of microfluidic devices using liquid crystal display-based printing

Publication Date: 2025.05.01 PURDUE RES FOUND

AI summary

A microfluidic device may be manufactured by printing a microchannel layer using the 3D printer. The microchannel layer may have an inlet and an outlet fluidly connected by at least one groove. A substrate layer may be spin coated with a clear resin. The printed microchannel layer may be placed onto the coated substrate such that the coated substrate layer covers at least one groove to form a microchannel. The microchannel layer and substrate layer may be heated and then cured with an ultraviolet light.