LCD Common Electrode Segmentation for ESD Repair
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Solution Overview
Problem
Conventional LCD devices are prone to electrostatic breakdown during manufacturing and repair, leading to image quality degradation due to electrostatic discharge-induced short circuits and incomplete repair methods that shorten the discharge path.
Innovation Solution
The design incorporates a plurality of narrow common electrode lines in the intersection region between the data signal and common electrode lines, forming a slit structure to reduce the probability of electrostatic breakdown and allow for multiple repairs without degrading image quality, with broken-down lines being cut off using laser light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode line is cut off at the broken-down portion to repair electrostatic breakdown, then the short circuit is avoided, but the discharge path is shortened and image quality degrades
Solution Approach 1:
The common electrode line is divided into multiple separate lines in the intersection region. When electrostatic breakdown occurs, only the broken segment needs to be cut and repaired, while other segments remain intact to maintain the discharge path and prevent image quality degradation.
2Ease of repair
If the common electrode line is cut off to repair electrostatic breakdown, then the broken-down path is repaired, but the discharge path is shortened and breakdown may happen again
Solution Approach 1:
The common electrode line is segmented into multiple lines, allowing partial repair without complete disruption of the discharge path. The intact segments continue to provide electrostatic discharge capability.
Solution Approach 2:
Multiple common electrode lines are pre-configured in the intersection region before operation. This preliminary arrangement ensures that if one line breaks, others are already in place to maintain discharge functionality.
3Device complexity
If a single common electrode line is used in the intersection region, then the structure is simple, but electrostatic breakdown easily occurs and repair degrades image quality
Solution Approach 1:
The single common electrode line is segmented into multiple parallel lines in the intersection region. This increases electrostatic breakdown resistance while maintaining relatively simple structure and facilitating repair without image quality degradation.
Solution Approach 2:
The common electrode line structure is made different in different regions: in the intersection region where electrostatic breakdown is likely, multiple lines are used to enhance reliability, while in other regions a single line suffices, maintaining simplicity.
Data Source
AI summary
A liquid crystal display (LCD) device is provided. The LCD device comprises a data signal line in a first plane and a common electrode line in a second plane, and the common electrode line comprises an intersection region, which is a region where a projection of the common electrode line in the first plane overlaps with a region of the data signal line. The intersection region comprises a plurality of narrow common electrode lines.