TFT Substrate with Floating Gate ESD and Coupling Capacitor
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Solution Overview
Problem
Conventional display devices face issues with large layout areas due to coupling capacitors, which can lead to poorly arranged wirings and device arrangements on the substrate, and existing ESD devices are inefficient in reducing electrostatic charges.
Innovation Solution
The implementation of a substrate with a thin-film transistor (TFT) and point-discharge structures between the floating gate and signal or ESD bus lines, allowing for efficient electrostatic discharge without occupying excessive layout space, enabling better wiring and device arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coupling capacitors are used in conventional display devices to reduce leakage current, then signal function is ensured, but layout area is excessively large
Solution Approach 1:
The patent combines the ESD device and coupling capacitor functions into a single integrated structure. The floating gate of the TFT serves dual purposes: as the control electrode for the ESD device and as one plate of the coupling capacitor, eliminating the need for separate capacitor structures and reducing layout area.
Solution Approach 2:
The floating gate structure performs multiple functions simultaneously: it acts as the control electrode for electrostatic discharge, serves as one plate of the coupling capacitor, and controls the TFT channel. This multi-functionality reduces the number of separate components needed.
2Object-affected harmful factors
If conventional ESD devices are used to discharge electrostatic charges, then electrostatic protection is provided, but layout area is excessively large
Solution Approach 1:
The ESD device is integrated with the TFT structure where the floating gate serves as the control electrode. This integration allows the ESD function to be achieved within the existing TFT footprint without requiring additional dedicated ESD device area.
Solution Approach 2:
The TFT's own floating gate structure is utilized to provide ESD protection, rather than requiring a separate ESD device. The existing TFT components serve the additional function of electrostatic discharge, making the system self-sufficient.
3Reliability
If coupling capacitors are arranged on the substrate, then leakage current is reduced, but wiring arrangement becomes difficult
Solution Approach 1:
The coupling capacitor is merged with the TFT structure where the floating gate serves as one plate. This integration eliminates the need for separate capacitor connections and simplifies the wiring arrangement by reducing the number of discrete components that need to be connected.
4Reliability
If device arrangement is improved to accommodate large coupling capacitors, then leakage current is reduced, but device layout complexity increases
Solution Approach 1:
The coupling capacitor function is merged into the TFT structure itself, using the floating gate as one plate of the capacitor. This integration eliminates the need for separate capacitor structures and their associated wiring, thereby reducing device layout complexity while maintaining the leakage current reduction function.
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 configuration allows for effective electrostatic discharge with reduced layout requirements, improving the arrangement of wirings and devices on the substrate while maintaining efficient signal and ESD functionality.
Implementation Method 1
a first point-discharge structure between the floating gate structure of the TFT and the first line
Data Source
AI summary
The present disclosure provides a substrate, including: a first line; a second line; a thin-film transistor (TFT) between the first line and the second line, having a floating gate structure, a source electrode electrically connected to the first line, and a drain electrode electrically connected to the second line; and a first point-discharge structure between the floating gate structure of the TFT and the first line.