Poly-silicon Gas Detector Integrated into LCD Electrical Connection Area
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Solution Overview
Problem
Liquid crystal display (LCD) devices lack integrated gas detection capabilities, particularly for hazardous gases like carbon monoxide, which are colorless and odorless, posing a risk in mobile applications where users may unknowingly enter dangerous gas environments.
Innovation Solution
An LCD device with a gas detector integrated within the electrical connection area, utilizing a sensing layer of poly-silicon between contact layers on an insulating substrate, capable of detecting gas particles and communicating a warning signal through an alarm unit, manufactured using Low Temperature Poly-crystalline Silicon (LTPS) technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas detector is integrated into the LCD device, then safety detection capability is improved, but device complexity increases
Solution Approach 1:
The gas detector is integrated into the LCD device by incorporating the sensing layer, contact layers, and dielectric layer structure within the existing LCD substrate, merging two functional systems (display and gas detection) into a single device. This allows the LCD device to provide both visual display and hazardous gas detection capabilities without requiring separate standalone devices.
2Measurement precision
If a sensing layer of poly-silicon is used between contact layers, then gas detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies using poly-silicon material with particular properties for the sensing layer, which provides high sensitivity and precision for detecting hazardous gases. The poly-silicon layer is deposited using Low Temperature Poly-crystalline Silicon (LTPS) technology, which enables precise gas detection while managing manufacturing complexity through controlled deposition processes.
Solution Approach 2:
The patent replaces complex mechanical gas detection systems with an electronic sensing layer structure that uses electrical properties to detect gas particles. The sensing layer, when exposed to hazardous gases, changes its electrical characteristics, providing precise detection through electrical measurements rather than mechanical means.
3Measurement precision
If the sensing layer surface is exposable to gas particles, then detection sensitivity is improved, but device reliability deteriorates due to environmental exposure
Solution Approach 1:
The patent applies different protective qualities to different regions of the device. The sensing layer has an exposable surface area that contacts gas particles for detection, while other parts of the device structure are protected by encapsulation layers. This localized approach allows the sensing region to be exposed for sensitivity while the rest of the device maintains reliability through protection.
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 integration of a gas detector within the LCD device enables real-time detection of hazardous gases, providing users with immediate warnings, enhancing safety in environments where dangerous gas concentrations may be present.
Implementation Method 1
A sensing layer of poly-silicon, positioned between the second and third contact layer and separately in contact with a least part of their circumferences, is arranged to detect gas particles
Data Source
AI summary
A liquid crystal display device with a substrate and a gas detector. The substrate has a pixel array area and an electrical connection area. The pixel array area has a plurality of pixels. The electrical connection area has a plurality of bond pads positioned on the surface of the substrate to address the plurality of pixels in the pixel array area. The gas detector is positioned within the electrical connection area. The gas detector is arranged to detect the presence of a specified gas.