Parallel Switch-Sensor Array for AM-EWOD Thermal Control
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Solution Overview
Problem
Existing temperature sensor arrays for active matrix electrowetting-on-dielectric (AM-EWOD) devices require multiple switch transistors and column electrodes, leading to increased layout footprint, complexity, and manufacturing costs, while also being less sensitive due to the dependence on process-dependent parameters.
Innovation Solution
A simplified temperature sensor array circuit with fewer switch transistors and column electrodes, where each array element includes a switch transistor and a temperature sensor element connected in parallel, allowing for reduced connections and a smaller layout footprint, and using diodes or multiple diodes in series to increase sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple switch transistors and column electrodes are used in temperature sensor arrays, then measurement coverage and reliability are improved, but layout footprint and device complexity increase
Solution Approach 1:
The patent combines multiple switch transistors into a single shared switch transistor that controls multiple temperature sensor elements. This merging approach reduces the number of individual components while maintaining the ability to selectively activate and measure from different sensor elements, thereby reducing layout footprint and device complexity while preserving measurement reliability
Solution Approach 2:
The shared switch transistor serves multiple functions by being able to select between different temperature sensor elements for activation. This multi-functional component replaces what would traditionally require separate dedicated switch transistors for each sensor element, reducing overall circuit complexity while maintaining measurement coverage
2Adaptability or versatility
If multiple switch transistors and column electrodes are used in temperature sensor arrays, then measurement coverage is improved, but layout footprint increases
Solution Approach 1:
Multiple temperature sensor elements share a common switch transistor and column electrode structure, allowing the array to maintain comprehensive measurement coverage across multiple sensing positions while using fewer physical components. This sharing arrangement significantly reduces the layout footprint compared to having dedicated switching and electrode structures for each sensor element
3Ease of manufacture
If process-dependent parameters are used for temperature sensing, then manufacturing simplicity is maintained, but measurement precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the voltage developed across the temperature sensor element is measured and used to determine temperature. By measuring the actual voltage developed in response to a known bias current, the system compensates for process variations and achieves precise temperature measurement without requiring additional complex manufacturing steps or calibration procedures
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, cost-effective, and sensitive temperature sensor array with improved manufacturing yield, capable of accurately measuring temperature across an AM-EWOD array, facilitating precise thermal control and reaction monitoring.
Implementation Method 1
a temperature sensor element having an impedance which varies as a function of temperature
Implementation Method 2
using diodes or multiple diodes in series to increase sensitivity
Data Source
AI summary
An array element (164) for a temperature sensor array circuit. The array element (164) includes a switch transistor (172); and a temperature sensor element (110) having an impedance which varies as a function of temperature, the temperature sensor element (110) being connected in parallel with a source and drain of the switch transistor (172).