Micro-fluidic Chip Droplet Speed via Voltage Division
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Solution Overview
Problem
Passive digital micro-fluidic chips are limited by the one-to-one correspondence between driving electrodes and bonding electrodes, restricting the number of driving electrodes and movement speed due to the response time of relays, which hampers integration and miniaturization.
Innovation Solution
A micro-fluidic chip design utilizing a coupling voltage effect with voltage-dividing resistors and insulating layers to reduce the number of bonding electrodes and enhance droplet transport speed, where the resistance values of voltage-dividing resistors increase linearly to generate varying voltages for driving droplets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If passive digital micro-fluidic chip uses one-to-one correspondence between driving electrodes and bonding electrodes, then droplet control precision is maintained, but the number of driving electrodes is limited and integration level cannot be improved
Solution Approach 1:
The patent applies universality by making a single bonding electrode serve multiple functions through voltage-dividing resistors. The bonding electrode is no longer dedicated to one driving electrode but can control multiple driving electrodes sequentially by switching voltage distribution, thus reducing the total number of electrodes needed while maintaining full control capability
Solution Approach 2:
The patent merges multiple driving electrode control functions into a single bonding electrode. By combining the bonding electrode with voltage-dividing resistors, one electrode structure performs the work of multiple separate electrode pairs, reducing overall device complexity and improving integration
2Speed
If passive digital micro-fluidic chip uses relay switching to control electrode on-off, then droplet movement control is achieved, but movement speed is limited by relay response time
Solution Approach 1:
The patent replaces the mechanical relay switching system with an electronic voltage division and switching mechanism. Instead of using mechanical relays with tens of milliseconds response time, the system uses electronic switches and voltage-dividing resistors that can change states much faster, eliminating the mechanical bottleneck and significantly improving droplet movement speed
Solution Approach 2:
The patent changes the control parameter from mechanical switch state to voltage distribution state. By controlling the voltage division ratio through electronic means rather than mechanical relay switching, the system achieves faster response times and higher droplet movement speeds while maintaining precise control
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 design significantly improves droplet transport speed and reduces the number of electrodes required, allowing for faster and more efficient movement of droplets, overcoming the limitations of traditional passive digital micro-fluidic chips.
Implementation Method 1
By utilizing the coupling voltage effect, significantly improves the transport speed of chip for the droplets
Implementation Method 2
voltage-dividing resistors coupled to the plurality of sub-blocks of the second electrode in one-to-one correspondence
Data Source
AI summary
A micro-fluidic chip is provided. The micro-fluidic chip includes: a first base substrate; a first electrode on the first base substrate and electrically coupled to a wire at a driving end; a second electrode on a side of the first electrode away from the first base substrate and spaced apart and electrically insulated from the first electrode, the second electrode including a plurality of sub-blocks of the second electrode, and an orthographic projection of the second electrode on the first base substrate being at least partially overlapped with an orthographic projection of the first electrode on the first base substrate; and voltage-dividing resistors coupled to the plurality of sub-blocks of the second electrode in one-to-one correspondence and electrically coupled to a ground wire.