Display ESD Discharge Circuit With Gate-Drain Overlap
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Solution Overview
Problem
Display devices are vulnerable to damage from static electricity, which can be input through signal lines and cause harm to internal electrical elements, and existing solutions do not effectively stabilize the operation of static electricity discharging circuits.
Innovation Solution
A static electricity discharging circuit is designed with a diode configuration that includes a semiconductor layer, gate electrode, source and drain electrodes, and an interlayer insulating layer, where the gate electrode overlaps the drain electrode to increase the threshold voltage, allowing for stable operation and effective discharge of static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate electrode is positioned to overlap the drain electrode, then the threshold voltage is increased and operational stability is improved, but the device complexity increases
Solution Approach 1:
The gate electrode is extended in the vertical dimension to overlap the drain electrode, transforming a planar configuration into a three-dimensional structure. This dimensional change increases the threshold voltage through enhanced electric field control while maintaining compatibility with standard semiconductor fabrication processes
Solution Approach 2:
The gate electrode is divided into multiple segments: a first gate electrode portion and a second gate electrode portion, where the second portion overlaps the drain electrode. This segmentation allows independent optimization of different gate regions to achieve both low off-state current and high threshold voltage
2Reliability
If the gate electrode overlaps the drain electrode to increase threshold voltage, then the diode operation stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The threshold voltage is adjusted by changing the geometric parameters of the gate electrode, specifically its width and position relative to the drain electrode. This parameter-based control allows tuning of the diode's electrical characteristics without requiring new materials or complex processing steps
Solution Approach 2:
The gate electrode structure serves multiple functions: it controls the threshold voltage, modulates the channel current, and provides the overlapping configuration needed for stable diode operation. This multi-functionality reduces the need for separate components and simplifies the overall device architecture
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area; a semiconductor layer including a source area, a channel area, and a drain area and disposed in the non-display area of the substrate; a gate electrode overlapping the channel area of the semiconductor layer; a gate insulating layer disposed between the gate electrode and the channel area of the semiconductor layer; a source electrode electrically connected to the source area of the semiconductor layer; and a drain electrode electrically connected to the drain area of the semiconductor layer, wherein a lateral side of the gate electrode overlaps the drain electrode.