LED-Coupled TFT Chemical Sensor for Direct Gas Visualization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current chemical sensors lack efficient visualization methods to detect chemical gas concentrations, relying on complex signal processing rather than direct visualization of gas effects.
Innovation Solution
A chemical sensing unit incorporating a thin film transistor with a chemically sensitive semiconductor active layer and a light-emitting diode, where a via hole exposes the semiconductor active layer to detect gases, altering the transistor's channel carrier transport rate and changing the light-emitting diode's brightness to visually represent gas concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chemical sensors use traditional signal detection methods, then they can detect chemical substances, but they lack direct visualization capability and require complex signal processing
Solution Approach 1:
The patent replaces traditional electrical signal processing systems with an optical system. A light-emitting diode (LED) is integrated with the thin-film transistor (TFT) chemical sensor, converting electrical signals (channel carrier transport rate changes) directly into optical signals (light emission intensity changes). This substitution eliminates complex signal processing circuits and enables direct visualization of chemical gas concentrations through light intensity variations.
Solution Approach 2:
The patent utilizes light emission intensity changes as a visual indicator of chemical gas concentration. The LED's light output varies in response to the TFT's electrical characteristics changes when exposed to target gases, providing a direct visual readout that replaces complex electronic signal processing and measurement systems.
2Volume of moving object
If chemical sensors are made smaller, then they achieve compact size, but fabrication complexity increases
Solution Approach 1:
The patent merges the chemical sensing function (TFT with chemically sensitive semiconductor active layer) and the light emission function (LED) into a single integrated device. The LED is electrically coupled to the TFT, sharing common structural elements and fabrication processes. This integration achieves compact sensor size while simplifying manufacturing by reducing the number of separate components and assembly steps.
Solution Approach 2:
The thin-film transistor serves dual functions: as the chemical sensing element (detecting gas concentrations through changes in channel carrier transport) and as the driving circuit for the light-emitting diode. This multi-functionality reduces the overall device complexity and fabrication steps while maintaining compact dimensions.
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 solution enables direct visualization of chemical gas concentrations through changes in light-emitting diode brightness, enhancing sensitivity and simplifying detection processes while reducing fabrication costs.
Implementation Method 1
the semiconductor active layer is mainly composed of a chemically sensitive semiconductor material
Implementation Method 2
a light emitting diode coupled to the thin film transistor. The light emitting diode includes a first electrode, a light-emitting functional layer, and a second electrode
Data Source
AI summary
Embodiments of the present disclosure relate to the field of electronic sensing technologies, and provide a chemical sensing unit, a chemical sensor, and a chemical sensing device. The chemical sensing unit includes a thin film transistor arranged on a substrate, and a light emitting diode coupled to the thin film transistor. The thin film transistor includes a semiconductor active layer, a source, and a drain, and the semiconductor active layer is mainly composed of a chemically sensitive semiconductor material. The chemical sensing unit is provided with a via hole in a region between the source and the drain, such that the semiconductor active layer is exposed at a position corresponding to the via hole. The light emitting diode includes a first electrode, a light-emitting functional layer, and a second electrode which are stacked in sequence, wherein the first electrode is coupled to the drain.