Microfluidic Piezoelectric Printhead With Integrated Actuation Control
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Solution Overview
Problem
Microfluidic devices with piezoelectric actuation face challenges in controlling a large number of ejecting elements due to the need for numerous external contact pads, leading to increased device size, complex electrical connections, and high assembly costs.
Innovation Solution
Integration of a control unit within the microfluidic device to generate actuation signals for the piezoelectric actuators, reducing the number of external contact pads and simplifying the electrical connections by incorporating a decoding unit and driving stage within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each ejecting element is controlled individually with external contact pads, then each element can be precisely controlled, but the device size increases and wiring complexity increases
Solution Approach 1:
The patent integrates the control unit directly into the microfluidic device structure, merging the control functionality with the ejecting elements. The control unit includes a decoding unit and driving stage that are physically integrated with multiple ejecting elements, allowing individual control of each element while sharing common control circuitry. This integration eliminates the need for separate external contact pads for each element, thereby reducing device area while maintaining individual element control capability.
2Ease of operation
If each ejecting element has individual external contact pads, then precise control is achieved, but wiring complexity and assembly cost increase
Solution Approach 1:
The control unit is integrated into the device structure, combining multiple control functions (decoding unit, driving stage) into a single embedded component. This integration reduces wiring complexity by eliminating numerous external connections and simplifying the electrical architecture. The control unit receives control signals and internally distributes them to individual ejecting elements through integrated connection structures rather than external wiring.
3Ease of operation
If numerous external contact pads are used for each ejecting element, then individual control is enabled, but assembly cost and time increase
Solution Approach 1:
The integrated control unit consolidates multiple control functions into a single component that is fabricated as part of the microfluidic device structure. This integration enables standard microfabrication processes to be used for creating the control unit and its connections to ejecting elements, eliminating complex manual wiring and assembly operations. The result is reduced assembly cost and time while maintaining the ability to individually control each ejecting element.
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 reduces the complexity and cost of wiring, decreases the device area required for contact pads, and simplifies assembly, while maintaining control over a large number of ejecting elements, enhancing the overall yield and operational efficiency.
Implementation Method 1
A piezoelectric actuator 39 is arranged on top of the membrane 37, within the actuator chamber 35. The piezoelectric actuator 39 is formed of a pair of electrodes 43, 44, mutually superposed, and a piezoelectric material layer 29, for example PZT (Pb, Zr, TiO3), extends between them.
Data Source
AI summary
A microfluidic device, having a containment body accommodating a plurality of ejecting elements arranged adjacent to each other. Each ejecting element has a liquid inlet, a containment chamber, a piezoelectric actuator and an ejection nozzle. The piezoelectric actuators of each ejecting element are connected to a control unit configured to generate actuation signals and to be integrated in the containment body.