Microfluidic Device Multi-Layer Driving Electrodes
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Solution Overview
Problem
In microfluidic devices, the pitches between driving electrodes of adjacent pixels can disrupt the electric field, affecting the movement and separation of micro-fine droplets, especially in high pixel density structures like 1,000 PPI, where the pitch width is significant, leading to inefficiencies in droplet control and separation.
Innovation Solution
The driving electrodes of adjacent pixels are arranged in different layers, reducing or eliminating pitches and ensuring continuity of the electric field, which enhances the precision of droplet movement and separation by applying voltages through switching circuits connected to thin film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving electrodes of adjacent pixels are arranged in the same layer, then the device structure is simpler, but the pitch between electrodes disrupts the electric field continuity, affecting droplet control precision
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked arrangement by placing driving electrodes of adjacent pixels in different layers. This vertical stacking eliminates the pitch disruption problem while maintaining electrode functionality, directly resolving the contradiction between structural simplicity and control precision.
Solution Approach 2:
The patent implements a multi-layer stacked structure where electrode layers are nested vertically above each other. Each layer contains driving electrodes for specific pixels, and the layers are interconnected through conductive structures, creating a compact three-dimensional electrode system that eliminates pitch gaps.
2Measurement precision
If pixel density is increased to 1,000 PPI, then the display resolution is improved, but the pitch width becomes significant, causing electric field disruption and reducing droplet manipulation efficiency
Solution Approach 1:
By stacking electrodes in multiple layers vertically, the patent enables high pixel density (1,000 PPI) without increasing the horizontal pitch width. The vertical arrangement allows pixels to be densely packed in the planar view while maintaining adequate electrode separation through the third dimension, thus preserving droplet manipulation efficiency.
Solution Approach 2:
The patent changes the spatial arrangement parameter from planar to three-dimensional stacking, which allows significant increase in pixel density while maintaining the effective electrode-to-electrode distance needed for proper electric field formation and droplet control.
3Reliability
If driving electrodes of adjacent pixels are placed in different layers, then the electric field continuity is improved, but the device structure and manufacturing process become more complex
Solution Approach 1:
The patent uses a nested multi-layer structure where electrode layers are stacked vertically and interconnected through conductive vias or bridges. This nesting approach achieves continuous electric field coverage across pixel boundaries while organizing the complexity into a systematic multi-layer architecture that can be manufactured using standard thin-film fabrication processes.
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 configuration improves the control precision and continuity of the electric field, facilitating the movement and separation of droplets by eliminating pitch-related disruptions, thereby optimizing droplet manipulation in microfluidic devices.
Implementation Method 1
driving electrodes of two adjacent pixels are in different layers... applying voltages to the driving electrodes of the two adjacent pixels... improves the control precision and continuity of the electric field
Data Source
AI summary
A microfluidic device, a method of using a microfluidic device and a micro total analysis system are provided. The microfluidic device includes a first substrate, and the first substrate includes a base substrate and a pixel array. The pixel array includes a plurality of pixels and is on the base substrate, and each of the plurality of pixels includes a driving electrode. Driving electrodes of two adjacent pixels are in different layers.