Offset Temperature Control Elements in EWOD Devices
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Solution Overview
Problem
Existing microfluidic devices face limitations in temperature control, including low rate of temperature change, long equilibrium times, and complex designs with multiple layers and zones, which restrict sample throughput and increase manufacturing costs and complexity, particularly in Lab-on-a-Chip applications.
Innovation Solution
An Active Matrix Electro-wetting-On-Dielectric (AM-EWOD) device with multiple, closely-spaced temperature zones is implemented, utilizing offset temperature control elements on both substrates to create high-density thermal zones, allowing for rapid thermal cycling and precise temperature control by heat exchange between elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external temperature control (e.g., hot plate) is used to control the temperature of the entire device, then temperature control is achieved, but the rate of temperature change is low and long time is required to reach thermal equilibrium
Solution Approach 1:
The device is divided into multiple independently controllable temperature zones (first temperature zones and second temperature zones) with separate temperature control elements. This segmentation allows different regions to be heated or cooled at different rates and to different temperatures, enabling rapid thermal cycling without requiring the entire device to reach thermal equilibrium simultaneously.
Solution Approach 2:
Each temperature zone has localized temperature control elements that provide targeted heating or cooling to specific regions. This local quality approach allows rapid temperature changes in specific zones without affecting the entire device, thereby reducing the time to achieve desired temperature profiles in each zone independently.
2Temperature
If multiple layers and zones are implemented for temperature control, then temperature control capability is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The first temperature control elements and second temperature control elements are integrated into a unified device structure with coordinated control. By merging the temperature control functions into a single coordinated system rather than separate independent systems, the device achieves multiple temperature zones without proportionally increasing overall complexity.
Solution Approach 2:
The temperature control elements serve multiple functions: they can heat or cool different zones independently, enable rapid thermal cycling, and provide precise temperature control for various droplet manipulation tasks. This multi-functionality reduces the need for additional specialized components, thereby controlling device complexity while maintaining advanced temperature control capability.
3Temperature
If multiple layers and zones are implemented for temperature control, then temperature control capability is improved, but manufacturing costs increase
Solution Approach 1:
The device employs dynamically controllable temperature zones that can be adjusted during operation to meet different assay requirements. This dynamic capability allows a single device design to replace multiple static temperature control configurations, reducing the need for expensive custom-manufactured devices for different applications.
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 enables faster thermal cycling, increased droplet throughput, and improved control over chemical or biological processes, reducing the time and cost associated with temperature control and manufacturing complexity.
Implementation Method 1
the first temperature control elements being in thermal contact with the first substrate and spaced from one another along a direction parallel to the plane of the fluid gap, and the second temperature control elements being in thermal contact with the second substrate
Implementation Method 2
at least M first temperature control elements and N second temperature control elements for defining (M+N) respective zones of controllable temperature in the fluid gap
Data Source
AI summary
An EWOD device for processing multiple droplets through multiple temperature zones. The device is configured to achieve a high spatial density of temperature zones with a wide temperature difference between hot and cold zones. A first set of temperature control elements is arranged above (or below) a fluid gap in an EWOD device and a second set of temperature control elements is arranged below (or above) the fluid gap. A temperature control element of one set is offset from temperature control elements of the other set in the plane of the fluid gap. The temperature control element of one set may be located at a different separation from the fluid gap to the temperature control element of the other set. The device has an optional temperature control element and/or arrangement which offsets the low temperature point from the inlet temperature. The two sets of temperature control elements are substantially interacting, in the sense that they cannot be considered to be thermally isolated from one another. This invention also describes methods to process multiple droplets within the multiple temperature zones.