OLED Pad Wire Inspection Zigzag Cutting Defect Detection
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Solution Overview
Problem
Organic light emitting diode displays are prone to defects during the cutting process, particularly when using flexible substrates, due to issues like oxygen and moisture exposure, which can affect the lifespan and manufacturing process conditions.
Innovation Solution
Incorporating an inspection wire with a zigzag, angled, or curved design that crosses the cutting line, allowing for easy identification of defects in pad wires during the cutting process, and using an insulating film between pad wires and the inspection wire to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temporary protective film is used to protect the display area during manufacturing, then the organic light emitting element is protected from damage, but the cutting process may inadvertently damage the pad wires due to lack of protection
Solution Approach 1:
The patent applies different protective measures to different areas: the display area is covered by a temporary protective film while the peripheral area containing pad wires is left exposed. This localized protection strategy allows the display area to be protected from damage during manufacturing and cutting processes, while the pad wires remain visible and accessible for inspection and connection operations.
Solution Approach 2:
The patent introduces an inspection wire as an intermediary element that crosses the cutting line in a zigzag pattern. This inspection wire serves as a visual indicator to monitor whether the cutting process has damaged the pad wires. By observing the inspection wire's continuity after cutting, manufacturers can detect pad wire damage without directly examining the pad wires themselves.
2Adaptability or versatility
If the substrate is made flexible to enable bending and thinning, then the display can be applied to various surfaces, but the manufacturing process conditions must be changed which may cause damage
Solution Approach 1:
The patent forms the pad wires and inspection wires on the flexible substrate before the cutting process. By preparing these conductive elements in advance on the flexible substrate, the manufacturing process can proceed with conditions suitable for flexible materials, avoiding damage that would occur if glass-substrate conditions were applied to flexible substrates.
3Measurement precision
If the inspection wire crosses the cutting line to detect defects, then pad wire damage can be identified, but the inspection wire structure becomes more complex
Solution Approach 1:
The patent designs the inspection wire with a zigzag pattern that crosses the cutting line at an angle rather than perpendicular to it. This angular crossing configuration allows the inspection wire to effectively detect cutting-induced damage to pad wires while minimizing the additional structure required, balancing defect detection capability with structural simplicity.
Data Source
AI summary
Disclosed is an organic light emitting diode display including: a substrate including a display area configured to display an image and a peripheral area surrounding the display area; a plurality of pad wires at the peripheral area of the substrate; and an inspection wire having a zigzag form on the plurality of pad wires.