Panel Drive Circuit With Step-Up Voltage for Microfluidic Droplets
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Solution Overview
Problem
Conventional microfluidic devices face limitations in driving ability, particularly with passive drive chips requiring numerous signal channels and active drive chips providing insufficient drive voltage for large-scale chemical reactions or substance detections.
Innovation Solution
A drive circuit with a step-up unit and signal input terminals that utilize a first and second module to generate and maintain a voltage difference across a capacitor, enabling high potential signal output through a signal output terminal, and a panel with an array of drive units and transistors to control electric fields between electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive drive chips are used to reduce signal channels by configuring drive electrodes and control circuits in an array, then the number of signal channels is reduced, but the driving ability is limited and a large number of drive electrodes are required for large-scale chemical micro-reactions or substance detections
Solution Approach 1:
The drive circuit is segmented into multiple functional modules: a step-up unit for voltage multiplication, a signal output unit for signal distribution, and a control unit for coordinating operations. This segmentation allows each module to perform its specific function efficiently, enabling the system to drive a large number of electrodes with fewer signal channels by generating high-voltage signals locally at each drive unit.
Solution Approach 2:
The patent transitions from a two-dimensional array configuration to a three-dimensional integrated structure by stacking the step-up unit, signal output unit, and control unit in vertical layers. This vertical integration reduces the horizontal space required for signal channels while maintaining the ability to drive numerous electrodes through localized high-voltage generation at each drive position.
2Power
If active drive chips are used to provide high drive voltage of about 50 V, then sufficient drive voltage is achieved, but the existing active drive chips can only provide about 30 V which is insufficient for driving droplets
Solution Approach 1:
The step-up unit dynamically changes the voltage parameter by multiplying the input voltage to generate the required high-voltage output. The voltage multiplication ratio can be adjusted to provide exactly the needed drive voltage (about 50 V) for droplet actuation, ensuring both sufficient power and reliable operation.
Solution Approach 2:
The step-up unit acts as an intermediary between the low-voltage signal input and the high-voltage drive requirement. It transforms the insufficient input voltage into the required high drive voltage, mediating the contradiction between available power and required power for reliable droplet driving.
3Productivity
If a large number of drive electrodes are required for large-scale chemical micro-reactions or substance detections, then large-scale operations are enabled, but the drive chips require a large number of signal channels which are not supported by current passive drive chips
Solution Approach 1:
Each drive unit is equipped with its own step-up unit that can independently generate high-voltage signals from a common low-voltage input. This self-service capability eliminates the need for individual high-voltage signal channels for each electrode, allowing large-scale electrode arrays to be driven with fewer signal channels while maintaining full driving capability.
Solution Approach 2:
The step-up unit is designed as a universal module that can serve multiple drive electrodes. By configuring multiple drive units, each with an identical step-up unit, the system can scale to support large numbers of electrodes without proportionally increasing the number of high-voltage signal channels, as each unit independently generates its own high-voltage signals from the shared low-voltage input.
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 potential signal output, reducing the need for numerous signal channels and ensuring sufficient drive voltage for large-scale chemical reactions or substance detections, enhancing the driving capability of microfluidic devices.
Implementation Method 1
The step-up unit includes a first capacitor, electrically connected with each other. The plurality of signal input terminals includes a first signal input terminal, a second signal input terminal, a third signal input terminal and a fourth signal input terminal. The first module is electrically connected to each of the first signal input terminal, the third signal input terminal, and a first electrode of the first capacitor
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 droplets may move under the driving action of the electric field
Data Source
AI summary
A panel and its drive method are provided. The panel includes: a substrate, an array layer and an electrode array layer, where 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 a plurality of drive units arranged in an array, a plurality of scan line groups and a plurality of data line groups; the scan line group includes first scan lines and second scan lines adjacent to the first scan lines, extending in a first direction; and the data line group includes first data lines and second data lines adjacent to the first data lines, extending in a second direction.