Guard Ring Wiring with Segmented Resistors for LCD Static Protection
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Solution Overview
Problem
Liquid crystal display devices face issues with static electricity during manufacturing, which can lead to dielectric breakdown of wiring lines and switching elements, and existing countermeasures are inadequate in effectively managing static electricity.
Innovation Solution
The implementation of a guard ring wiring system with resistor elements of varying resistance values, strategically positioned between input and output pads and common terminals, which extends along the substrate end and is electrically insulated from gate and source lines, helps to dissipate static electricity and prevent its entry into the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate electrodes of protection TFTs are formed integral with gate lines or relay electrodes, then static electricity protection is provided, but the protection effectiveness is insufficient and dielectric breakdown may still occur
Solution Approach 1:
The guard ring wiring is divided into multiple segments with different resistance values (first guard ring wiring with lower resistance, second guard ring wiring with higher resistance) positioned at different locations. This segmentation allows each segment to handle different levels of static electricity discharge, with the lower resistance segment handling higher current near the active area and the higher resistance segment providing additional protection further out, thereby preventing dielectric breakdown more effectively than a single integrated structure.
Solution Approach 2:
Different resistance values are assigned to different portions of the guard ring wiring based on their specific locations and functions. The first guard ring wiring closer to the active area has lower resistance to quickly discharge high-level static electricity, while the second guard ring wiring farther away has higher resistance to provide graded protection. This local differentiation of electrical properties optimizes the overall protection effectiveness against dielectric breakdown.
2Device complexity
If a simple guard ring wiring is used, then the structure is simple, but the electrostatic breakdown voltage is insufficient
Solution Approach 1:
The guard ring wiring is segmented into multiple distinct wiring portions (first and second guard ring wirings) with different resistance characteristics positioned at different locations around the active area. This segmentation increases the electrostatic breakdown voltage by providing multiple discharge paths with graded resistance values, enhancing protection without requiring a completely complex restructure of the basic guard ring concept.
Solution Approach 2:
The guard ring wiring system combines different resistance values (effectively different electrical properties) within the same wiring structure. The first guard ring wiring has a first resistance value while the second guard ring wiring has a second resistance value, creating a composite electrical structure that achieves higher electrostatic breakdown voltage protection while maintaining reasonable structural simplicity.
3Ease of manufacture
If uniform resistance values are used in guard ring wiring, then the manufacturing process is simple, but static electricity dissipation effectiveness is reduced
Solution Approach 1:
Different resistance values are implemented at different locations of the guard ring wiring (first resistance value for first guard ring wiring, second resistance value for second guard ring wiring) based on the specific electrical requirements of each position. This local differentiation of resistance properties optimizes static electricity dissipation effectiveness by providing graded discharge paths, while still using the same basic wiring formation process, thus maintaining ease of manufacture.
Solution Approach 2:
The resistance value parameter is changed at different portions of the guard ring wiring to optimize static electricity dissipation. By adjusting the resistance value parameter (from first resistance value to second resistance value) at different locations, the system achieves improved static electricity management effectiveness while using standard wiring fabrication techniques, balancing manufacturing simplicity with enhanced protection.
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 suppresses static electricity, preventing dielectric breakdown and improving the electrostatic breakdown voltage by up to 16%, ensuring reliable operation of the liquid crystal display device.
Implementation Method 1
a guard ring wiring which is formed above the insulative substrate in a manner to extend from the first common terminal, to pass between the first input pad and the first output pad of the first mounting portion, to pass between the second input pad and the second output pad of the second mounting portion, and to reach the second common terminal
Data Source
AI summary
According to one embodiment, a flat panel display includes a first mounting portion including a first input pad and a first output pad, a second mounting portion including a second input pad and a second output pad, a first common terminal and a second common terminal, which have a common potential, and a guard ring wiring which is formed in a manner to extend from the first common terminal, to pass between the first input pad and the first output pad of the first mounting portion, to pass between the second input pad and the second output pad of the second mounting portion, and to reach the second common terminal, the guard ring wiring including a first resistor element of a first resistance value and a second resistor element of a second resistance value which is higher than the first resistance value.