GOA Area ESD Protection Circuit for TFT Display Panels
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Solution Overview
Problem
The integration of system on panel (SOP) in liquid crystal display technology faces challenges in electrostatic discharge (ESD) protection, particularly in the middle area between signal lines, where static electricity can cause malfunction due to high sensitivity and narrow wiring gaps, leading to signal line damage.
Innovation Solution
An array substrate configuration with GND wirings surrounding GOA areas and ESD protection circuits in the middle area, comprising diodes connected in parallel between GOA signal lines and GND wirings, providing symmetrical ESD protection units to discharge abnormal electrical charges and prevent signal line damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the volume of electronic devices is decreased to improve portability, then the density of integrated circuits increases, but the gap between wirings becomes narrower and ESD protection capability deteriorates
Solution Approach 1:
The patent introduces ESD protection circuits specifically in the middle area between GOA circuits where static electricity accumulation is most problematic. Rather than uniformly protecting all areas, the protection is locally targeted to where it is most needed, allowing narrow wiring gaps to be protected without increasing overall device volume.
Solution Approach 2:
The ESD protection circuit acts as an intermediary component between the GOA signal lines and ground. It provides a controlled discharge path for static electricity, mediating the harmful effect of ESD while maintaining the narrow wiring layout required for compact device design.
2Adaptability or versatility
If GOA technology is integrated on panel to improve system integration, then the middle area between signal lines becomes more compact, but ESD protection is often ignored leading to increased susceptibility to static electricity damage
Solution Approach 1:
The ESD protection circuits are designed and integrated into the GOA structure in advance, before the device is put into service. This preliminary protection ensures that when static electricity occurs during testing or usage, the damage is already mitigated by the pre-positioned protection circuits.
Solution Approach 2:
The patent applies ESD protection specifically in the middle area between GOA circuits where the compact integration creates vulnerability. This localized approach provides targeted protection in the most susceptible area without compromising the overall system integration benefits of GOA technology.
3Reliability
If ESD protection circuits are added to the middle area to improve protection capability, then the circuit complexity increases, but the signal lines gain better protection against static electricity discharge
Solution Approach 1:
The ESD protection circuit uses a repetitive modular structure where identical protection units are copied and arranged in the middle area. This copying approach simplifies the design process and reduces complexity by using standardized units rather than custom-designed protection circuits.
Solution Approach 2:
The ESD protection circuit is designed to automatically discharge static electricity when voltage thresholds are exceeded, without requiring external control or intervention. This self-service capability reduces the operational complexity of the protection system while maintaining high reliability.
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
Enhances ESD protection capability in the middle area, preventing signal line failures and maintaining panel functionality by effectively discharging static electricity, thus ensuring reliable operation.
Implementation Method 1
a first ESD protection circuit being configured in a middle area between the 1-th stage GOA circuit and the N-th stage GOA circuit to discharge abnormal electrical charges of the GOA signal lines within the middle area
Implementation Method 2
the ESD protection unit includes a first diode and a second diode connected in parallel, and a positive end of the first diode 1242 electrically connects to a negative end of the second diode, and the negative end of the first diode electrically connects to the positive end of the second diode
Data Source
AI summary
The present disclosure relates to an array substrate, a display panel and a display device. The array substrate includes GND wirings and GOA areas. The GND wirings are configured at outer sides of the GOA areas, and the GOA area includes a variety of GOA signal lines and N-th stage GOA circuits electrically connected by the GOA signal lines. A first ESD protection circuit is configured in a middle area between the 1-th stage GOA circuit and the N-th stage GOA circuit to discharge abnormal electrical charges of the GOA signal lines within the middle area. With such configuration, better ESD protection capability is provided between the GOA signal lines.