Electrostatic Prevention Circuit for Display Devices
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Solution Overview
Problem
In the TFT-LCD manufacturing industry, high-voltage static electricity poses a significant risk to thin film transistors, leading to reduced yield and quality due to electrostatic discharge, and existing electrostatic prevention circuits consume excessive power, especially for low-frequency and direct-current electrostatic signals which cause minimal damage.
Innovation Solution
An electrostatic prevention circuit incorporating a thin film transistor and a capacitor, where the gate electrode of the transistor is connected to the capacitor, allowing high-frequency and high-voltage signals to pass through while blocking low-frequency and direct-current signals, thereby reducing power consumption and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing electrostatic prevention circuits are used to release all electrostatic signals, then electrostatic protection is provided, but power consumption is excessive due to discharge of low-frequency and direct-current signals that cause minimal damage
Solution Approach 1:
The patent changes the frequency parameter of electrostatic signal processing by introducing a capacitor that differentiates between high-frequency and low-frequency signals. The capacitor allows high-frequency signals to pass through to the thin film transistor for discharge, while blocking low-frequency signals, thereby changing the operational parameters of the electrostatic protection circuit to reduce unnecessary power consumption.
Solution Approach 2:
The capacitor serves as an intermediary component between the electrostatic signal source and the thin film transistor. It mediates the signal transmission by selectively passing high-frequency signals while blocking low-frequency signals, enabling the circuit to distinguish between harmful and harmless electrostatic signals without requiring complex control logic.
2Object-affected harmful factors
If high-voltage static electricity is released to prevent damage, then thin film transistor breakdown is prevented, but all electrostatic signals including low-frequency signals are discharged causing unnecessary power consumption
Solution Approach 1:
The patent applies local quality by giving different parts of the circuit different functions: the capacitor is positioned specifically to filter frequency characteristics, while the thin film transistor is positioned to handle only the filtered high-frequency signals. This localized functional differentiation ensures that energy is dissipated only when necessary for high-voltage protection.
Solution Approach 2:
Instead of completely blocking all electrostatic signals, the circuit performs partial action by allowing only high-frequency signals to pass through to the thin film transistor. Low-frequency signals are blocked by the capacitor, representing a partial filtering action that prevents excessive discharge while maintaining necessary 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
This configuration effectively reduces power consumption and enhances battery life by selectively releasing or balancing high-frequency and high-voltage electrostatic signals while preventing low-frequency and direct-current signals from causing unnecessary discharge, thus improving the efficiency and stability of electrostatic protection.
Implementation Method 1
a gate electrode of the thin film transistor is connected to the capacitor
Data Source
AI summary
An electrostatic prevention circuit, an array substrate and a display device are provided. The electrostatic prevention circuit includes an electrostatic prevention sub-circuit, and the electrostatic prevention sub-circuit includes a thin film transistor and a capacitor; a gate electrode of the thin film transistor is connected to the capacitor, and the thin film transistor is controlled by a signal passing through the capacitor.