GND Trace Segmentation for ESD Reduction in HADS Array Substrates
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Solution Overview
Problem
High aperture advanced super dimensional switching (HADS) array substrates are prone to electro-static discharge (ESD), which affects product yield due to the accumulation of static electricity on the GND trace, leading to potential damage and poor display performance.
Innovation Solution
The array substrate design includes a GND trace with conductive line segments separated by intervals and a connection structure that electrically connects these segments through via holes, reducing static electricity accumulation by forming a non-closed loop GND trace and using insulating layers to prevent direct overlap with the first electrode layer, thereby reducing the potential difference and ESD occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous GND trace is used, then the grounding effect is improved, but static electricity accumulation increases leading to ESD
Solution Approach 1:
The GND trace is divided into multiple separate conductive line segments instead of forming a continuous loop. Each segment is isolated from others, preventing static electricity accumulation while maintaining grounding functionality through distributed segments that connect to the common electrode via via holes
2Area of moving object
If the GND trace overlaps with the first electrode layer, then the aperture ratio is improved, but the potential difference increases causing ESD
Solution Approach 1:
The patent uses via holes to connect the GND trace segments to the common electrode in the first electrode layer, transitioning from a two-dimensional planar connection to a three-dimensional vertical connection. This allows the GND trace to overlap with the electrode layer in the planar view (improving aperture ratio) while maintaining electrical connection through the vertical dimension via via holes, reducing potential difference
Data Source
AI summary
An array substrate includes a base substrate and a GND trace. The GND trace is disposed along an edge of the substrate, and the GND trace includes a plurality of conductive line segments separated from each other and a connection structure disposed on a side of the GND trace away from the base substrate. The connection structure electrically connects the conductive line segments.