GOA Display Substrate ESD Layout for STV Signal Protection
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Solution Overview
Problem
The high density of metal in Gate Driver on Array (GOA) circuits leads to electro-static discharge (ESD) issues, causing defects and reducing the yield of GOA units due to electro-static penetration and short circuits.
Innovation Solution
Incorporating a first capacitor connected to the STV signal line and a common electrode lead through an ESD unit in the peripheral region of the display substrate, which guides and discharges static electricity, and optionally connecting a second common electrode lead to ground through another ESD unit to further mitigate ESD effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If GOA circuit with high metal density is used to improve integration and reduce IC driver utilization, then integration is improved and IC driver utilization is reduced, but electro-static discharge defects occur and product yield decreases
Solution Approach 1:
An ESD unit is introduced as an intermediary component between the high-density GOA circuit and the common electrode lead. This ESD unit acts as a mediator that safely channels and dissipates electro-static charges, preventing them from causing short circuits or damage to the GOA circuit while maintaining the high integration benefits of the original design.
2Ease of operation
If metal density in GOA circuit is increased to reduce IC driver utilization, then IC driver utilization is reduced, but electro-static charges accumulate causing ESD defects
Solution Approach 1:
The ESD unit converts the harmful accumulation of electro-static charges into a beneficial discharge mechanism. By providing a controlled path through the common electrode lead to ground, the accumulated charges are safely dissipated, transforming the potential harm of high metal density into a manageable electrical characteristic that does not compromise circuit reliability.
3Reliability
If ESD unit is added to provide electro-static discharge path, then reliability is improved and short circuits are prevented, but device complexity increases
Solution Approach 1:
The ESD unit is merged with the existing common electrode lead structure. Instead of adding a completely separate ESD protection circuit, the design combines the ESD functionality with the already-present common electrode lead, thereby providing short circuit prevention while minimizing the increase in overall device 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 configuration effectively reduces the risk of static electricity-induced short circuits and improves the product yield of GOA circuits by providing electro-static discharge paths, preventing damage to the STV signal lines and enhancing the reliability of the display substrate.
Implementation Method 1
the first common electrode lead is connected to the STV signal line through the at least one first ESD unit... effectively reduces the risk of static electricity-induced short circuits by providing electro-static discharge paths
Data Source
AI summary
Provided is a display substrate including a substrate, wherein the substrate includes a display region and a peripheral region located at the periphery of the display region. A GOA circuit, a first common electrode lead, a first capacitor and at least one first ESD unit are provided in the peripheral region. The GOA circuit includes a plurality of GOA units and STV signal lines electrically connected to at least one GOA unit. The first common electrode lead is connected to the STV signal line through at least one first ESD unit. A first capacitor electrode of the first capacitor is connected to the STV signal line, and a second capacitor electrode of the first capacitor is connected to the first common electrode lead.