TFT Pixel Electrode Layout Using Auxiliary ESD Discharge Paths
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Solution Overview
Problem
Conventional electronic devices with thin-film transistors are prone to damage from electrostatic discharge (ESD) due to accumulated electrostatic charges during manufacturing or operation, leading to poor display performance.
Innovation Solution
Incorporating an auxiliary electrode partially overlapped with the first electrode and electrically connected to a common electrode, which is isolated from the first electrode, to facilitate the discharge of electrostatic charges to a larger common electrode area, thereby reducing damage to the thin-film transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary electrode is added to discharge electrostatic charges, then the reliability of thin-film transistors is improved, but the device complexity increases
Solution Approach 1:
The auxiliary electrode is merged with the common electrode structure, where the common electrode serves dual functions: as the common electrode for pixel operation and as a discharge path for electrostatic charges. This integration reduces the need for separate dedicated ESD protection electrodes, thereby improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The common electrode is designed to perform multiple functions: it serves as the common electrode for pixel voltage control and simultaneously acts as a charge dissipation path for electrostatic discharge protection. This multi-functionality allows the system to gain ESD protection capability without adding dedicated separate components, thus improving reliability while minimizing increases in device complexity.
2Reliability
If the auxiliary electrode is placed close to the first electrode, then the discharge efficiency is improved, but the risk of electrical interference increases
Solution Approach 1:
An insulation layer is introduced as an intermediary between the auxiliary electrode and the first electrode. This insulation layer allows the auxiliary electrode to be positioned close to the first electrode for efficient charge discharge, while simultaneously preventing direct electrical contact and interference. The insulation layer acts as a mediator that enables close proximity for functional efficiency while blocking harmful electrical interference.
Solution Approach 2:
The insulation properties are applied locally at the interface between the auxiliary electrode and the first electrode, rather than throughout the entire device. This localized insulation approach allows charge discharge efficiency in the proximity zone while preventing electrical interference only where needed, maintaining overall system performance without excessive insulation throughout the entire device structure.
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 mitigates the risk of ESD damage to thin-film transistors, enhancing the electrical characteristics and display quality of electronic devices by ensuring efficient discharge of electrostatic charges.
Implementation Method 1
a lot of electrostatic charges may exist, for example the electrostatic charges accumulated on manufacturing machines or tools or on devices to be disposed on the thin-film transistors. Accordingly, electrical characteristics of the thin-film transistors may be shifted or the thin-film transistors may be damaged due to the electrostatic discharge (ESD)
Implementation Method 2
The auxiliary electrode is electrically connected to the common electrode... to facilitate the discharge of electrostatic charges to a larger common electrode area
Data Source
AI summary
The present disclosure provides an electronic device including a substrate, a common electrode, and a plurality of pixels. The common electrode is disposed on the substrate. The pixels are disposed on the substrate, and at least one of the pixels includes a thin film transistor, a first electrode, a second electrode, and an auxiliary electrode. The first electrode is electrically connected to the thin film transistor. The auxiliary electrode is partially overlapped with the first electrode in a top view direction of the electronic device. The auxiliary electrode is electrically connected to the common electrode and electrically isolated from the first electrode, and the first electrode and the auxiliary electrode have a minimum distance less than a minimum distance between the first electrode and the common electrode.