Microfluidic Panel Drive Circuit With Voltage Boosting Electrodes
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Solution Overview
Problem
Conventional microfluidic devices face limitations in providing sufficient drive voltage for large-scale chemical micro-reactions and substance detections, as passive drive chips require numerous signal channels and active drive chips often output insufficient voltage for liquid droplet movement.
Innovation Solution
A drive circuit with a step-up unit and capacitor configuration that increases the signal voltage, allowing for high potential output from low input voltage, and a panel design with transistor and capacitor structures to form an electric field between drive electrodes, enabling efficient liquid droplet movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive drive chips are used in control circuits, then the device complexity is reduced, but the driving ability is limited and a large number of signal channels are required
Solution Approach 1:
The control circuit is divided into multiple control units, each capable of independently controlling drive electrodes. This segmentation allows the system to handle large-scale operations without requiring a proportional increase in signal channels, as multiple control units can share and reuse signal channels through time-division multiplexing.
Solution Approach 2:
Each control unit is designed with universal functionality to control multiple drive electrodes through shared signal channels. The control units can operate in different modes and share resources, reducing the overall number of signal channels needed while maintaining the ability to drive large numbers of electrodes.
2Quantity of substance
If active drive chips are used to reduce signal channels, then the device complexity is reduced, but the drive voltage is insufficient for liquid droplet movement
Solution Approach 1:
A voltage boosting circuit is introduced as an intermediary component between the control unit and the drive electrodes. This boosting circuit receives low-voltage control signals and converts them into high-voltage drive signals, enabling the system to use fewer signal channels while maintaining sufficient drive voltage for liquid droplet manipulation.
Solution Approach 2:
The system changes the voltage parameter dynamically by using voltage boosting circuits that convert low-voltage control signals into high-voltage drive signals. This parameter transformation allows the control circuit to operate with low-voltage logic levels while delivering high-voltage outputs necessary for electrowetting-driven liquid droplet movement.
3Productivity
If a large number of drive electrodes are used for large-scale chemical micro-reactions, then the productivity is improved, but the number of signal channels required increases beyond current chip capabilities
Solution Approach 1:
The system segments the control function into multiple independent control units, each capable of controlling a subset of drive electrodes. This segmentation enables scalable expansion of the number of drive electrodes without a proportional increase in signal channels, as control units can share channels through time-division multiplexing and coordinated operation.
Solution Approach 2:
The control system employs dynamic time-division multiplexing where control units alternately activate and share signal channels. This dynamic approach allows the system to control a large number of drive electrodes using a limited number of physical signal channels by rapidly switching between different electrode groups in a coordinated manner.
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 solution provides a high drive voltage necessary for large-scale microfluidic operations, reducing the need for numerous signal channels and improving the drive capability of microfluidic devices, enabling efficient liquid droplet movement and reaction processes.
Implementation Method 1
the step-up unit includes a first module, a second module, a third module and a first capacitor, electrically connected with each other
Implementation Method 2
The control circuits may be configured to supply voltage to the drive electrodes, so an electric field may be formed between adjacent drive electrodes, and the liquid droplets may move under the driving force of the electric field
Implementation Method 3
Based on the dielectric electrowetting effect, continuous liquid may be discretized by an external driving force to manipulate and analyze micro-scale formed liquid droplets
Implementation Method 4
The drive method includes forming an electric field between adjacent drive electrodes on the panel by modifying potential signals received from the data line of two adjacent drive units
Data Source
AI summary
A panel includes a substrate, an array layer and an electrode array layer. The array layer is on a side of the substrate; the electrode array layer is on a side of the array layer away from the substrate; and the array layer includes an active layer, a gate metal layer and a source/drain metal layer. The substrate includes drive units arranged in an array, scan line groups, data lines extending in a second direction; and common signal lines extending in the second direction. The scan line group includes first scan lines and second scan lines, extending in a first direction. The first direction is perpendicular with the second direction. The electrode array layer includes drive electrodes arranged in an array; the drive electrodes correspond to the drive units; and the drive unit includes a first transistor, a second transistor, a third transistor, a first capacitor and a second capacitor.