GOA Protection Circuit for Electrostatic Discharge
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Solution Overview
Problem
Gate driver on array (GOA) circuits are prone to electrostatic discharge during testing, which can damage the panel and affect its stability due to the inability of test pads to function effectively.
Innovation Solution
A GOA protection circuit is introduced, comprising a transparent substrate with multiple layers including a metal layer, insulating layer, active layer, doped layer, passivation layer, and an antistatic layer made of indium tin oxide (ITO), connected to the GOA drive signal lines to discharge static electricity, thereby preventing damage during electrostatic discharge without impacting the pad's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pad is used to complete test functions in GOA circuit, then test functionality is achieved, but electrostatic discharge damage occurs during testing
Solution Approach 1:
The patent introduces a protection circuit as an intermediary component between the test pad and the GOA drive signal line. This protection circuit includes electrostatic discharge protection elements (such as diodes or MOS transistors) that intercept and dissipate static electricity before it can reach and damage the sensitive GOA circuit components, thus protecting the panel while maintaining test functionality.
Solution Approach 2:
The protection circuit converts the harmful electrostatic discharge energy into a controlled current path that safely dissipates the static electricity. By providing a predetermined discharge path through protection elements like clamp diodes or ESD-specific structures, the harmful static charge is redirected to ground or a safe reference potential, transforming the destructive force into a controlled protective mechanism.
2Reliability
If protection circuit is added to prevent electrostatic discharge, then panel stability is improved, but device complexity increases
Solution Approach 1:
The protection circuit is merged with the existing GOA circuit structure by integrating ESD protection elements directly into the signal line path. The protection components (diodes, transistors) are combined with the existing metal layers, insulating layers, and conductive structures of the GOA circuit, allowing the protection function to be embedded within the existing circuit architecture rather than adding completely separate protective structures.
Solution Approach 2:
The protection circuit elements serve multiple functions: they provide electrostatic discharge protection, maintain signal integrity, and can be designed to work across different GOA circuit configurations. The same protection structure can protect multiple signal lines (STV, VSS, LC) simultaneously, and the design can be adapted to various panel types and testing requirements, reducing overall system complexity through multi-functional components.
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 GOA protection circuit effectively discharges static electricity, preventing damage to the GOA drive signal lines and maintaining the pad's functionality during testing, while reducing space usage with an I-type diode design.
Implementation Method 1
static electricity is released through the GOA protection circuit, which can effectively prevent damage to a GOA drive signal line during electrostatic discharge
Data Source
AI summary
A gate driver on array (GOA) circuit and a display panel including the same are provided. The GOA circuit includes: a GOA drive signal line including a voltage common (VCOM) signal line, a start vertical (STV) signal line, a reference voltage (VSS) signal line, and a low-frequency clock (LC) signal line; and a GOA protection circuit, wherein an end of the GOA protection circuit is connected to the VCOM signal line, and another end thereof is electrically connected to the STV signal line, the VSS signal line, and the LC signal line.