OLED Ground Ring ESD Protection Design
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Solution Overview
Problem
Conventional organic light emitting displays are vulnerable to static electricity generated during manufacturing and external environments, which can damage internal circuits and affect picture quality due to electrostatic discharge (ESD).
Innovation Solution
An organic light emitting display design that includes a substrate with a pixel unit and a non-pixel unit, featuring a ground ring and mother substrate wiring line connected by a connection wiring line to enhance static electricity discharge and protect the pixels and driving units from ESD damage, with additional protection layers such as Si3N4 for increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional organic light emitting display structure is used, then the manufacturing process is simple, but the display is vulnerable to electrostatic discharge damage from static electricity generated during manufacturing and external environments
Solution Approach 1:
The ground ring is formed in advance during the manufacturing process, before the display is completed and before static electricity damage can occur. This preliminary structural preparation ensures that the ESD protection mechanism is already in place and functional, allowing static electricity to be discharged safely without requiring additional complex protective structures to be added later.
2Reliability
If the ground ring area is increased to improve static electricity discharge capability, then the protection against ESD is enhanced, but the area occupied in the non-pixel unit increases
Solution Approach 1:
The ground ring is merged with existing structures in the non-pixel unit, specifically utilizing the space around the pixel units and integrating with the mother substrate wiring line. This merging approach allows the ground ring to provide comprehensive ESD protection while sharing the available space with other functional elements, thereby enhancing discharge capability without proportionally increasing the occupied area.
Solution Approach 2:
The ground ring is configured to extend in multiple directions and layers within the non-pixel unit, utilizing three-dimensional space rather than simply expanding in one plane. This dimensional approach allows the ground ring to achieve sufficient discharge capability by optimizing its path through available space, connecting to multiple ground points and utilizing vertical layering to maximize protection coverage without excessive area occupation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively increases the area for static electricity discharge to ground, enhancing the reliability against electrostatic damage and improving picture quality by reducing the risk of short circuits and defects caused by ESD.
Implementation Method 1
static electricity can be generated internally or externally from the manufacturing processes... electrostatic discharge (ESD) generated by manufacturing processes... increases the area for static electricity discharge to ground
Data Source
AI summary
An organic light emitting display including: a substrate having a center region; a pixel unit on the substrate and at the center region of the substrate; a non-pixel unit on the substrate and at an external circumference of the pixel unit; a ground ring in the non-pixel unit; a mother substrate wiring line on the substrate and at the external circumference of the ground ring; and a connection wiring line for electrically connecting the ground ring and the mother substrate wiring line to each other.