Quantum Dot Thin Film Transistor Sensing Device for Biometrics
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Solution Overview
Problem
Existing sensing devices for suspension operations and biometrics, such as capacitive and infrared sensing devices, face challenges in minimizing size and reducing costs, particularly due to the need for self-capacitance and additional light sources.
Innovation Solution
A sensing device integrating a display panel with a sensing layer using quantum dot thin film transistors (QD TFTs) and micro light emitting diodes (micro LEDs) that emit near-infrared light, allowing for simultaneous display and sensing of suspension operations and biometrics without the need for additional light sources, thereby reducing thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive sensing device uses self-capacitance, then sensing function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the light emitting diode and photodetector into an integrated sensing device structure, where the photodetector is formed in the same semiconductor layer as the light emitting diode. This integration eliminates the need for separate sensing components and reduces manufacturing complexity while maintaining sensing functionality.
Solution Approach 2:
The sensing device structure serves multiple functions: the light emitting diode provides illumination, the photodetector performs sensing, and the shared semiconductor layer provides both light emission and detection capabilities. This multi-functionality reduces the need for separate dedicated sensing components, lowering manufacturing costs.
2Reliability
If infrared sensing device includes infrared light source and receiver, then sensing capability is achieved, but device size increases
Solution Approach 1:
The patent merges the light emitting diode and photodetector into a single integrated structure where both components share the same semiconductor layer and substrate. This consolidation significantly reduces the overall device volume compared to separate infrared light source and receiver assemblies.
Solution Approach 2:
The photodetector is formed within the same semiconductor layer structure as the light emitting diode, with the sensing region nested within or adjacent to the light emitting structure. This nested arrangement minimizes space requirements while maintaining both emission and detection functions.
3Measurement precision
If additional light sources are added for sensing, then sensing accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates the light emitting diode and photodetector into a single device structure, eliminating the need for additional separate light sources. The built-in light emitting diode provides sufficient illumination for sensing operations, reducing component count and manufacturing complexity while maintaining sensing accuracy.
Solution Approach 2:
The light emitting diode within the sensing device provides its own illumination source, making the device self-sufficient. This self-service capability eliminates the need for external or additional light sources, reducing manufacturing costs while ensuring adequate lighting for accurate sensing measurements.
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 device effectively senses suspension operations and biometrics by utilizing near-infrared light to detect changes in conductivity, enabling accurate mapping of blood vessels and tracking movement trajectories, while maintaining a compact and cost-effective design.
Implementation Method 1
A sensing device integrating a display panel with a sensing layer using quantum dot thin film transistors (QD TFTs) that emit near-infrared light, allowing for simultaneous display and sensing of suspension operations and biometrics
Implementation Method 2
micro light emitting diodes (micro LEDs) that emit near-infrared light
Data Source
AI summary
A device for sensing suspension operations or biometrics includes a light emitting module and a sensing layer. The light emitting module and the sensing layer are sequentially stacked. The light emitting module includes a plurality of light emitting elements emitting light near the infrared and the sensing layer includes a plurality of quantum dot thin film transistors. The quantum dot thin film transistor includes an active layer and quantum dots covering the active layer. The near-infrared light emitted by the plurality of light emitting elements is reflected by an animate object and received by the quantum dot thin film transistors. The sensing device can better sense suspension operations or biometrics. A method for the procedure is also disclosed.