Hexagonal and Triangular EWoD Electrodes for Reduced Cross-Talk
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Solution Overview
Problem
Conventional pixel arrays with rectangular or square electrodes face limitations in addressing individual pixels efficiently, leading to complexity in construction and control, as well as inconsistencies in the electric field, which can affect the performance of electrowetting on dielectric (EWoD) devices and displays.
Innovation Solution
The use of backplanes with arrays of hexagonal or triangular electrodes, where gate lines are routed along the periphery, allowing for simpler construction, reduced cross-talk, and improved electric field regularity, enabling efficient control of each electrode with standard controllers and plug-and-play compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional planar microelectrode arrays are used, then manufacturing is straightforward, but cell attachment and recording stability are poor due to flat surface contact
Solution Approach 1:
The patent applies curvature by replacing flat planar electrodes with three-dimensional curved surfaces including hexagonal prisms, triangular prisms, and cylindrical structures. These curved surfaces increase the contact area with neuronal cell bodies, improving cell attachment stability and recording reliability without significantly complicating the manufacturing process.
Solution Approach 2:
The invention transitions from two-dimensional planar electrodes to three-dimensional structures by adding vertical dimension through prismatic and cylindrical shapes. This dimensional change enables deeper penetration into tissue and broader contact with cell bodies, enhancing recording stability while maintaining compatibility with standard fabrication techniques.
2Measurement precision
If planar electrodes are used, then device structure is simple, but signal quality is limited due to restricted contact area with cell bodies
Solution Approach 1:
The curved surfaces of hexagonal, triangular, and cylindrical electrodes provide extended contact area with neuronal cell bodies compared to flat electrodes. This increased surface area improves signal quality by capturing more neuronal activity while the structures remain compatible with standard microfabrication processes.
Solution Approach 2:
The patent implements nested arrays where multiple layers of three-dimensional electrodes are stacked vertically, with each layer containing hexagonal, triangular, or cylindrical electrodes. This nested configuration multiplies the total contact area with cell bodies, significantly enhancing signal quality and recording capacity.
3Productivity
If standard planar arrays are used, then manufacturing is easy, but spatial sampling of neuronal activity is insufficient
Solution Approach 1:
The nested array configuration stacks multiple layers of three-dimensional electrodes vertically, creating a dense three-dimensional sampling grid. This arrangement dramatically increases the number of recording sites and improves spatial sampling efficiency, while each layer can be fabricated using standard planar processes before stacking.
Solution Approach 2:
By adding the vertical dimension through stacked layers of hexagonal, triangular, and cylindrical electrodes, the invention transforms a two-dimensional sampling plane into a three-dimensional sampling volume. This enables comprehensive spatial sampling of neuronal activity throughout the tissue depth.
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 simplifies the construction and control of electrodes, reduces complexity and costs, and enhances the regularity of the electric field, making it suitable for both display and non-display applications like particle sensing and electrowetting on dielectric devices.
Implementation Method 1
electrowetting on dielectric device
Implementation Method 2
a hydrophobic layer over the dielectric layer
Data Source
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AI summary
Active matrix backplanes including an array of hexagonal electrodes or an array of triangular electrodes. Because the backplane designs route the gate lines along the periphery of the electrodes there is less cross talk with the surface of the electrode. The disclosed designs simplify construction and control of the electrodes and improve the regularity of the electric field above the electrode. Such backplane electrode designs may be particularly useful in electrowetting on dielectric (EWoD) devices and electrophoretic displays (EPD).