Mother Substrate ESD Protection Using Conductive Rings and Dummy Circuits
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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 between thin film layers, leading to defects and reduced yield.
Innovation Solution
A mother substrate with conductive rings and dummy pixel driving circuits equipped with electrostatic protection structures is used to shield display panels from ESD, ensuring the display panels are at the same potential as the conductive rings, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic discharge protection structures are added to pixel driving circuits, then reliability against ESD damage is improved, but device complexity increases
Solution Approach 1:
The protection mechanism is segmented into two distinct components: conductive rings that surround display areas to capture and dissipate ESD, and electrostatic prevention structures integrated into pixel driving circuits and dummy pixel driving circuits. This segmentation allows the protection function to be distributed across multiple elements rather than requiring a single complex protection circuit, thereby improving reliability while managing device complexity.
Solution Approach 2:
Dummy pixel driving circuits are disposed in non-display areas before the actual display panel manufacturing is completed. These dummy circuits include electrostatic prevention structures that are activated in advance to protect against ESD during the manufacturing process. By implementing protection measures before defects occur, the patent prevents ESD damage to the display panel without requiring complex post-manufacturing protection circuits.
2Productivity
If dummy pixel driving circuits are disposed in non-display areas, then productivity is improved through defect prevention, but device complexity increases
Solution Approach 1:
Dummy pixel driving circuits are created as simplified copies of the actual pixel driving circuits, disposed in non-display areas of the mother substrate. These dummy circuits replicate the essential structure and electrostatic prevention features of functional pixel circuits but are not connected to display elements. By using copying, the patent achieves defect prevention through ESD protection while avoiding the full complexity of complete functional circuits, thereby improving productivity with manageable complexity additions.
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.