Flexible Bimodal Sensor With Protruding Gate Insulator
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Solution Overview
Problem
Conventional pressure sensors have a 2D thin-film structure, limiting their sensitivity for detecting small pressures and are prone to temperature interference, making them unsuitable for wearable electronics that require real-time biorhythm monitoring.
Innovation Solution
A flexible bimodal sensor with a 3D microstructure, featuring a gate insulating layer with protrusions and a channel layer that outputs current signals for both temperature and pressure, utilizing a processor to determine these values based on channel trans-conductance and equilibrium voltage, and an encapsulating layer to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 2D thin-film structure is used for pressure sensing, then the device structure is simple and easy to manufacture, but the pressure sensitivity is insufficient for detecting small pressures and bio-rhythmic changes
Solution Approach 1:
The patent transitions from a 2D thin-film structure to a 3D microstructure by forming protrusions on the gate insulating layer surface. This dimensional change creates larger mechanical deformation under pressure, significantly enhancing pressure sensitivity while maintaining compatibility with standard semiconductor manufacturing processes
Solution Approach 2:
The patent modifies the physical parameters of the gate insulating layer by creating protrusions with specific geometric parameters (height, radius, spacing). These parameter changes enable the structure to exhibit enhanced mechanical response to pressure while maintaining electrical insulation properties
2Adaptability or versatility
If separate temperature sensor and pressure sensor are integrated on the same substrate, then both temperature and pressure can be detected, but the device volume increases
Solution Approach 1:
The patent creates a multi-functional sensor where the gate insulating layer with protrusions serves dual purposes: it acts as both the pressure sensing element (through mechanical deformation) and the temperature sensing element (through electrical property changes). This single structure performs both sensing functions, eliminating the need for separate sensors and reducing device volume
Solution Approach 2:
The patent merges the temperature sensing and pressure sensing functions into a single integrated structure. The gate insulating layer with protrusions combines both sensing capabilities, and the shared transistor circuitry further integrates the two sensing paths, achieving compact bimodal sensing
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 flexible bimodal sensor achieves high sensitivity for measuring low pressures and temperatures, enabling real-time bio-information monitoring with increased sensitivity compared to traditional sensors, suitable for wearable devices.
Implementation Method 1
A flexible bimodal sensor includes... a gate insulating layer comprising a plurality of protrusions... The drain electrode may output a current signal simultaneously indicating a temperature value and a pressure value
Implementation Method 2
a channel layer disposed on the source electrode and the drain electrode... The drain electrode may output a current signal
Data Source
AI summary
A flexible bimodal sensor includes a gate electrode; a flexible substrate; a source electrode disposed on the flexible substrate; a drain electrode disposed on the flexible substrate apart from the source electrode; a channel layer disposed on the source electrode and the drain electrode and a portion of the flexible substrate between the source electrode and the drain electrode; and a gate insulating layer comprising a plurality of protrusions, the gate insulating layer being disposed on the channel layer and arranged between the channel layer and the gate electrode. The drain electrode outputs a current signal simultaneously indicating a temperature value and a pressure value sensed by the flexible bimodal sensor.