Shared Sensor Circuitry for AM-EWOD Array Elements
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Solution Overview
Problem
Current Active Matrix Electrowetting-On-Dielectric (AM-EWOD) devices face challenges in minimizing array element size and simplifying circuitry while maintaining functionality, leading to increased manufacturing complexity and power consumption.
Innovation Solution
The proposed solution involves simplifying the array element circuitry by sharing components such as sensor readout transistors and reset transistors across multiple rows or columns, reducing the number of components and addressing lines, and implementing a shared sensor output column line between adjacent columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If array element circuitry components are shared across multiple rows or columns, then device complexity is reduced, but manufacturing precision may be compromised
Solution Approach 1:
The patent merges sensor readout transistors and reset transistors across multiple array elements, allowing shared components to reduce overall device complexity while maintaining manufacturing precision through standardized fabrication processes
Solution Approach 2:
Shared sensor readout transistors and reset transistors serve multiple array elements simultaneously, enabling universal components to perform multiple functions across different rows or columns without compromising manufacturing precision
2Ease of manufacture
If the number of components and addressing lines is reduced, then ease of manufacture improves, but reliability may deteriorate
Solution Approach 1:
By combining sensor readout transistors and reset transistors into shared components across multiple array elements, the patent simplifies fabrication processes while maintaining reliability through redundant signaling paths and coordinated control mechanisms
Solution Approach 2:
The patent segments the array into groups that share common transistors, allowing independent control and sensing operations within each segment while simplifying overall manufacturing through reduced component count
3Productivity
If array element size is minimized, then productivity increases, but device complexity increases
Solution Approach 1:
The patent merges sensor readout and reset functions into shared transistors that serve multiple array elements, enabling smaller array element sizes and higher productivity while reducing overall device complexity through component sharing
Solution Approach 2:
The patent organizes array elements into rows and columns that share common transistors, utilizing the two-dimensional spatial arrangement to reduce complexity while maintaining high productivity through efficient addressing schemes
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 results in a more compact and efficient array element circuitry with reduced component count, improved manufacturing yield, and decreased power consumption without compromising sensor resolution.
Implementation Method 1
impedance sensor circuitry configured to sense impedance at the array element electrode to determine a droplet property at the array element
Implementation Method 2
Active Matrix Electrowetting-On-Dielectric (AM-EWOD) devices and array element circuitry for actuation and sensing
Data Source
AI summary
An AM-EWOD device includes a plurality of array elements arranged in an array of rows and columns, each of the array elements including array element circuitry, an element electrode, and a reference electrode. The array element circuitry includes actuation circuitry that applies actuation voltages to the element and reference electrodes, and impedance sensor circuitry that senses impedance at the array element electrode to determine a droplet property at the array element. At least one component of the impedance sensor circuitry is a shared component that is shared between more than one of the array elements. The shared component may include a shared sensor readout transistor that passes a sensor current to a sensor output line, or a shared reset transistor that applies a reset voltage to a gate of the shared sensor readout transistor, with such components being shared by array elements in adjacent rows. The shared component may include a shared sensor output column line that is shared between array elements in adjacent columns.