LCD Protection Line for ESD Discharge
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Solution Overview
Problem
In liquid crystal displays (LCDs), the compactness of the driver's inner signal lines makes them prone to damage from electrostatic discharge (ESD), which can disrupt the ESD guiding path and lead to unsafe discharge and damage to the liquid crystal panel, reducing the reliability of the LCD.
Innovation Solution
The introduction of a protection line surrounding the electrostatic guiding line forms an ESD assistant structure, where most electrostatic charges are directly released to the ground via the protection line, reducing the electrical overstress on the driver's signal lines and preventing external charges from entering the active area, thereby enhancing the reliability of the LCD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driver is made compact to improve integration, then device complexity is reduced, but the inner signal lines become thinner and more vulnerable to electrostatic damage, reducing reliability
Solution Approach 1:
The patent introduces a protection line as an intermediary component between the electrostatic guiding line and the driver's inner signal lines. This protection line acts as a mediator that intercepts and conducts electrostatic charges to ground before they can reach the vulnerable thin signal lines inside the compact driver, thus resolving the contradiction between compact integration and reliability.
2Reliability
If the electrostatic guiding line directly connects to the driver to provide ESD path, then electrostatic charges can be discharged, but the thin inner signal lines are damaged by electrical overstress, cutting off the ESD path and reducing reliability
Solution Approach 1:
The protection line serves as an intermediary that intercepts electrostatic charges before they reach the driver's inner signal lines. It provides an alternative conduction path to ground, preventing electrical overstress on the thin signal lines while maintaining the ESD discharge functionality.
Solution Approach 2:
The patent segments the ESD protection function into two distinct parts: the electrostatic guiding line that collects charges from the active area, and the protection line that conducts charges to ground while protecting the driver. This segmentation allows each component to be optimized for its specific function, with the protection line being sufficiently robust to handle ESD currents without damaging the driver's thin signal lines.
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 allows for safe discharge of electrostatic charges, reducing the risk of damage to the driver's signal lines and improving the overall reliability of the LCD by minimizing electrical overstress and preventing external charges from reaching the active area.
Implementation Method 1
When an ESD phenomenon takes place in the LCD 100, a plurality of electrostatic charges in the active area 130 of the liquid crystal panel 110 discharge toward the electrostatic guiding line 140
Implementation Method 2
The protection line surrounds the electrostatic guiding line, and electrically coupled to the at least one the ground line directly
Data Source
AI summary
An exemplary liquid crystal display (200) includes a liquid crystal panel (210), a driver (280), and a flexible printed circuit board (220). The liquid crystal panel includes an active area (230) and a peripheral non-active area. The driver is configured to drive the liquid crystal panel. The flexible printed circuit board includes at least one the ground line (222) electrically coupled to the ground. The non-active area includes an electrostatic guiding line (240) and a protection line (270). The electrostatic guiding line surrounds the active area, and is electrically coupled to the at least one the ground line via the driver. The protection line surrounds the electrostatic guiding line, and electrically coupled to the at least one the ground line directly.