Dual-Path Electrostatic Discharge Circuit for Display Panels
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Solution Overview
Problem
The existing electrostatic discharge circuits in display panels can only release positive charge, failing to discharge negative charge, which leads to panel breakdown when negative charge accumulates.
Innovation Solution
An electrostatic discharge circuit with two conductive paths, one for releasing positive charge to a first power voltage and another for releasing negative charge to a second power voltage, utilizing N-type thin film transistors and storage capacitors to manage the discharge effectively, ensuring the circuit is only activated by alternating current voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electrostatic discharge path is used, then the circuit structure is simple, but only positive charge can be discharged while negative charge accumulation causes breakdown
Solution Approach 1:
The electrostatic discharge circuit is divided into two separate conductive paths: a first conductive path for discharging positive charge and a second conductive path for discharging negative charge. Each path has its own thin film transistor and storage capacitor configuration, allowing independent discharge of opposite charges while maintaining overall circuit functionality.
Solution Approach 2:
The electrostatic discharge circuit is designed to perform multiple functions through two conductive paths that can handle both positive and negative charge discharge. The circuit maintains compatibility with existing display panel operations while adding the capability to discharge both types of charge accumulation.
2Speed
If the thin film transistor width to length ratio is large, then the electrostatic discharge path turns on quickly, but the circuit cannot distinguish between normal operation voltage and electrostatic discharge voltage
Solution Approach 1:
Storage capacitors are pre-configured in the circuit with specific voltage levels. During normal operation, these capacitors maintain voltage levels that keep the thin film transistors off. When electrostatic discharge occurs, the voltage change causes charge redistribution that turns on the appropriate transistor, ensuring selective activation only when needed.
Solution Approach 2:
The circuit utilizes changes in voltage parameters to trigger discharge. The storage capacitors create different voltage conditions during normal operation versus electrostatic discharge events. The thin film transistors respond to these parameter changes by switching states, enabling discrimination between normal voltage and discharge voltage.
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 solution enables complete discharge of both positive and negative charges, preventing panel breakdown and minimizing the influence of electrostatic discharge during operation by using distinct paths and voltage management.
Implementation Method 1
an output end is connected to a first power voltage for releasing positive charge accumulated in the display panel
Implementation Method 2
an output end is connected to a second power voltage for releasing negative charges accumulated in the display panel
Data Source
AI summary
An electrostatic discharge circuit and a display panel. The electrostatic discharge circuit includes a first conductive path and a second conductive path. An input end of the first conductive path is connected to a data signal of the display panel, and an output end is connected to a first power voltage for releasing positive charge accumulated in the display panel. An input end of the second conductive path is connected to the data signal of the display panel, and an output end is connected to a second power voltage for releasing negative charges accumulated in the display panel.