Mother Substrate Conductive Ring Layout for Display Panel ESD Protection
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Solution Overview
Problem
Electrostatic discharge (ESD) during the manufacturing process of electroluminescent display panels can cause insulation breakdown or short circuits, leading to defects and reduced yield.
Innovation Solution
A mother substrate is designed with a conductive ring surrounding the display area and dummy pixel driving circuits in the non-display area, incorporating an electrostatic discharge protection structure to prevent ESD effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic discharge protection structures are added to prevent ESD damage, then reliability is improved, but device complexity increases
Solution Approach 1:
A conductive ring is introduced as an intermediary element between the display area and the dummy pixel driving circuit. This conductive ring acts as a mediator to safely discharge electrostatic charges before they can reach and damage the sensitive pixel driving circuits, thereby protecting the device without requiring complex protection structures within each circuit
Solution Approach 2:
Dummy pixel driving circuits are created as simplified copies of the actual pixel driving circuits. These dummy circuits replicate the essential electrical characteristics and vulnerability to ESD, allowing them to serve as sacrificial targets for electrostatic discharge while the real circuits remain protected. This approach provides effective protection without adding complex protection mechanisms to each individual circuit
2Manufacturing precision
If dummy pixel driving circuits are disposed in non-display area, then manufacturing precision is improved, but area occupied increases
Solution Approach 1:
Dummy pixel driving circuits are placed in the non-display area as simplified replicas of the functional circuits. These dummy circuits occupy additional space but serve the critical function of absorbing ESD events during manufacturing, thereby improving overall manufacturing precision and yield by preventing damage to actual pixel circuits
Solution Approach 2:
The substrate is divided into distinct functional zones: display areas for light emission, non-display areas for housing dummy circuits and conductive rings, and separate regions for different circuit functions. This segmentation allows the dummy circuits to be positioned in unused non-display spaces, utilizing otherwise wasted area for protective functions
Data Source
AI summary
A mother substrate for a display panel and a display panel using the same are disclosed. A mother substrate for a display panel includes a conductive ring disposed in a non-display area outside the display area and surrounding each of the display areas, and one or more dummy pixel driving circuits disposed in a non-display area outside the display area. An electrostatic discharge (ESD) prevention structure inside the dummy pixel driving circuit can prevent defects of display panels due to ESD occurring in the manufacturing process of the display panel.