TFT Heating Structure on Glass Substrates for Large-Area Fabrication
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Solution Overview
Problem
The fabrication of large-area heating devices is hindered by the limitations of silicon wafer size, leading to increased production costs and making mass-production impossible due to the need for splicing methods.
Innovation Solution
A heating device is fabricated using a thin-film transistor (TFT) on a substrate, incorporating a heater and a bridging component electrically connected to the TFT, with a high-melting-point material to maintain reliability under high-temperature conditions, and utilizing a glass or flexible substrate to overcome size limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a splicing method is used to fabricate large-area heating devices on silicon substrates, then the heating device area can be increased, but the production cost increases and mass production becomes impossible
Solution Approach 1:
The patent changes the substrate material from silicon to glass, which allows for larger substrate sizes without requiring splicing. This parameter change in the substrate material enables large-area heating devices to be fabricated as single pieces, eliminating the need for costly splicing operations and interval alignment procedures.
Solution Approach 2:
The patent extracts the heating element and TFT circuitry from the traditional silicon substrate context and implements them on a glass substrate. This extraction allows the use of different fabrication processes suitable for glass substrates, which can be produced in larger sizes without splicing, thereby reducing production costs for large-area devices.
2Area of stationary object
If a splicing method is used to fabricate large-area heating devices, then the heating device area can be increased, but mass production becomes impossible due to alignment and correction requirements
Solution Approach 1:
By changing the substrate material parameter from silicon to glass, the patent enables a different fabrication approach that does not require splicing. Glass substrates can be manufactured in larger sizes directly, allowing entire large-area heating devices to be fabricated in a single process run, thereby enabling mass production without alignment and correction steps.
Solution Approach 2:
The patent segments the fabrication process by using a glass substrate that can accommodate the entire heating device layout in one go, eliminating the need to segment the device into multiple smaller silicon wafers that require splicing. This single-substrate approach streamlines the manufacturing process for mass production.
3Reliability
If a separate resistance heater is used instead of integrating heating function into the drain, then reliability under high-temperature conditions is improved, but device complexity increases
Solution Approach 1:
The patent extracts the heating function from the TFT drain structure and implements it as a separate resistance heater. This separation allows the heater to be independently optimized for high-temperature operation without compromising the TFT circuitry, improving reliability while maintaining reasonable device complexity through modular design.
Solution Approach 2:
The patent introduces a bridging component as an intermediary element that electrically connects the separate resistance heater to the TFT drain. This mediator enables the heater to operate independently at high temperatures while still being controlled by the TFT circuitry, achieving both reliability and manageable complexity.
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 approach allows for the production of large-area heating devices with improved reliability and reduced costs, overcoming the limitations of silicon wafer size and enabling mass-production.
Implementation Method 1
The heater is disposed on the substrate. The bridging component is electrically connected to the heater and either the source or the drain
Data Source
AI summary
A heating device is provided. The heating device includes a substrate, a thin-film transistor disposed on the substrate, a heater disposed on the substrate, and a bridging component. The thin-film transistor includes a gate, a semiconductor layer, a source, and a drain. The bridging component is electrically connected to the heater and either the source or the drain. A method for fabricating the heating device is also provided.