Array Substrate Common Electrode Extension for Narrow-Bezel ESD
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Solution Overview
Problem
Narrow bezels in TDDI type touch display products lead to thinner GND line widths, resulting in electro-static discharge (ESD) defects and reduced anti-ESD capability.
Innovation Solution
The common electrode layer is extended beyond the active display region into the frame region, with a first extended common electrode overlapping the outermost active pixel electrode, effectively redirecting electrostatic accumulation away from the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the bezel width is reduced to achieve higher screen-to-body ratio, then the appearance is improved and space is saved, but the GND line width becomes thinner leading to ESD defects
Solution Approach 1:
The common electrode is extended from the traditional planar configuration into the frame region, utilizing the third dimension (depth/extension beyond active display area) to provide additional ESD protection path without increasing the visible bezel width. This dimensional extension allows the ESD protection structure to occupy space outside the active display region while maintaining narrow bezels.
Solution Approach 2:
The extended common electrode acts as an intermediary structure between the active pixel electrodes and the frame region, providing a dedicated ESD protection path. This intermediary element redirects electrostatic discharge away from the thin GND lines in the narrow bezel area, preventing ESD defects while maintaining the narrow bezel design.
2Productivity
If the GND line width is reduced to accommodate narrow bezels, then the screen-to-body ratio is improved, but ESD defects occur
Solution Approach 1:
The ESD protection function is achieved by extending the common electrode into the frame region, utilizing space outside the active display area. This dimensional approach provides adequate ESD protection without requiring wider GND lines within the constrained bezel area, thereby maintaining high screen-to-body ratio.
Solution Approach 2:
The extended common electrode serves as an intermediary ESD protection structure that compensates for the reduced GND line width. It provides an alternative discharge path for electrostatic energy, preventing defects that would otherwise occur due to the thin GND lines necessitated by narrow bezel design.
3Reliability
If the common electrode is extended into the frame region, then ESD protection is improved, but the device complexity increases
Solution Approach 1:
The extended common electrode structure serves multiple functions: it maintains the common electrode potential for display operation and simultaneously provides ESD protection by extending into the frame region. This multi-functionality achieves improved ESD protection without adding separate dedicated ESD structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The ESD protection function is merged with the common electrode structure by extending it into the frame region. Instead of creating a separate ESD protection system, the design combines both functions into a single integrated structure, reducing overall device complexity while achieving the desired ESD protection.
Data Source
AI summary
An array substrate of a display device includes a pixel electrode layer on a substrate, which includes active pixel electrodes in an active display region; outermost active pixel electrodes include a first active pixel electrode including a first pixel electrode edge and a second pixel electrode edge; in a first direction, the first pixel electrode edge is between the second pixel electrode edge and a frame region. One of the array substrate and an opposite substrate of the display device includes a common electrode layer including a first extended common electrode which includes a first extended portion extending beyond the first active pixel electrode; a first extended portion edge of the first extended portion and a first substrate edge of the substrate respectively extend in a second direction; in the first direction, the first extended portion edge is located between the first substrate edge and the first pixel electrode edge.