Display Substrate ESD Circuit for AMOLED Crack Detection Lines
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Solution Overview
Problem
Static electricity accumulation during the processing of Active Matrix Organic Light-Emitting Diode (AMOLED) display screens can lead to breakdowns in thin film transistors, resulting in failed pixel points or entire panel failures, as existing methods like layer exchange of traces are insufficient for complete discharge, especially when the antenna effect occurs in the highest metal layer.
Innovation Solution
A display substrate with a common electrode and electrostatic discharge circuits, including thin film transistors connected to a crack detection line, effectively discharges static electricity by using a capacitor-like configuration where the gate of the thin film transistor is connected to the common electrode, allowing for efficient electrostatic discharge and reducing the risk of panel breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If layer exchange of traces is used for electrostatic discharge, then discharge capability is improved, but it is insufficient when antenna effect occurs in the highest metal layer
Solution Approach 1:
The patent transitions from two-dimensional trace layer exchange to three-dimensional capacitor structure utilizing the gate electrode and common electrode separated by insulation layers, creating vertical discharge paths that extend beyond the planar metal layer constraints
Solution Approach 2:
The gate electrode serves as an intermediary element between the crack detection line and the common electrode, enabling electrostatic discharge through capacitor formation rather than direct trace connection, thus providing universal applicability across different metal layer configurations
2Reliability
If electrostatic discharge circuits are added to protect against static electricity, then product yield is improved, but device complexity increases
Solution Approach 1:
The gate electrode of the thin film transistor serves dual purposes: as a functional component for crack detection and as an electrode for electrostatic discharge capacitor, eliminating the need for separate discharge circuit components and reducing overall device complexity
Solution Approach 2:
The patent merges the crack detection function and electrostatic discharge function into a single integrated circuit structure, where the thin film transistor and its associated capacitor serve both detection and protection purposes simultaneously
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 effectively eliminates static electricity accumulation, protecting the display substrate and AMOLED panels from damage, thereby improving product yield and reliability by utilizing a capacitor-like configuration within the electrostatic discharge circuits.
Implementation Method 1
A display substrate with a common electrode and electrostatic discharge circuits, including thin film transistors connected to a crack detection line, effectively discharges static electricity by using a capacitor-like configuration where the gate of the thin film transistor is connected to the common electrode
Implementation Method 2
Static electricity is one of the important factors leading to a poor product. The at least one electrostatic discharge circuit effectively eliminates static electricity accumulation, protecting the display substrate and AMOLED panels from damage
Data Source
AI summary
The present disclosure relates to a display substrate, a display panel and a display device. The display substrate includes: a base substrate including a display area and a peripheral area surrounding the display area; a common electrode located in the peripheral area and surrounding the display area; a panel crack detection line located in the peripheral area and surrounding the display area, wherein the panel crack detection line is located on one side of the common electrode away from the display area; and at least one electrostatic discharge circuit located in the peripheral area, wherein the at least one electrostatic discharge circuit includes at least one first thin film transistor including an active layer, a gate, a source and a drain, the source and the drain are electrically connected to the panel crack detection line, and the gate is electrically connected to the common electrode.