Movable Thermistor Pixel Structure for Thermal Signal Reset
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Solution Overview
Problem
Conventional sensing devices face challenges in accurately resetting thermal signals due to heat dissipation issues, affecting the accuracy of subsequent detections, particularly in devices that convert infrared light into thermal signals.
Innovation Solution
A sensing device design featuring a thermistor separated from the substrate by an air gap, allowing it to thermally conduct with the substrate during a reset period, facilitated by electrostatic or piezoelectric movements, to dissipate heat and improve signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thermistor is separated from the substrate by an air gap to reduce heat dissipation, then the thermal signal is preserved better, but the thermal signal cannot be reset effectively, affecting accuracy of subsequent detections
Solution Approach 1:
The thermistor is designed to be movable relative to the substrate, transitioning between a floating state (separated by air gap) and a contact state (touching the substrate). This dynamic structure allows the system to switch between heat insulation mode and heat dissipation mode, resolving the contradiction between preserving thermal signals and resetting them for subsequent detections
Solution Approach 2:
The sensing device operates in periodic cycles, alternating between a sensing period where the thermistor floats to preserve thermal signals and a reset period where the thermistor contacts the substrate to dissipate heat. This periodic switching enables both accurate thermal detection and effective signal resetting
2Measurement precision
If the thermistor is in thermal conduction with the substrate to reset the thermal signal, then the accuracy of subsequent detections is improved, but heat dissipation occurs during operation, affecting current detection accuracy
Solution Approach 1:
The movable thermistor enables dynamic control of thermal conduction, allowing the system to establish or break thermal contact with the substrate based on operational requirements. This resolves the contradiction by enabling selective heat dissipation only when needed for resetting, rather than continuous heat loss during sensing
Solution Approach 2:
The system employs periodic switching between sensing mode (thermistor floating) and reset mode (thermistor contacting substrate). During the sensing period, heat dissipation is minimized to maintain detection accuracy. During the reset period, thermal conduction is established to clear the thermal signal, preparing for the next detection cycle
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
The thermal signal on the thermistor is effectively reset, enhancing the accuracy of subsequent detections by preventing heat dissipation and maintaining precise thermal readings.
Implementation Method 1
convert the infrared light into a thermal signal
Implementation Method 2
the thermistor is in thermal conduction with the substrate
Implementation Method 3
the first electrode receives a first voltage, and a part of the thermistor moves toward the substrate
Data Source
AI summary
The present disclosure provides a sensing device including a substrate and a sensing pixel. The sensing pixel is disposed on the substrate and includes an electrode and a thermistor. The thermistor is electrically connected to the electrode and is separated from the substrate by an air gap. When the sensing pixel is operated in a period, the electrode receives a voltage, and a part of the thermistor moves toward the substrate, such that the thermistor is in thermal conduction with the substrate.