OLED Mother Board Inspection Pad Structure for Reliability
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Solution Overview
Problem
Display devices using organic light-emitting diodes (OLEDs) face challenges in maintaining reliability due to degradation issues.
Innovation Solution
A mother board design for display devices incorporating a rib layer with pixel apertures and inspection pads formed from multiple metal layers, including a rib layer between first and second metal layers, with specific contact portions and apertures to enhance structural integrity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED display elements are used in display devices, then display quality and modernity are improved, but reliability decreases due to degradation issues
Solution Approach 1:
The patent applies beforehand cushioning by introducing a rib layer between the first and second metal layers of inspection pads. This rib layer, positioned in advance before degradation occurs, provides mechanical support and stress distribution to prevent OLED degradation. The structure proactively addresses potential reliability issues by cushioning against future thermal and mechanical stresses that would otherwise cause degradation over time.
2Manufacturing precision
If inspection pads are added to the mother board, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The inspection pads are designed with multi-functionality, serving both as electrical connection elements and as inspection/test points for manufacturing quality control. The same pad structure that provides electrical connectivity also enables precision inspection when combined with the rib layer support, eliminating the need for separate inspection components and thus not increasing overall device complexity.
Solution Approach 2:
The patent merges the inspection function with the existing metal layer structure by adding the rib layer between first and second metal layers. This integration combines structural support, electrical connectivity, and inspection capabilities into a unified pad design, improving manufacturing precision without proportionally increasing complexity through separate dedicated inspection components.
3Reliability
If multiple metal layers are used in inspection pads, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the inspection pad into multiple metal layers (first and second metal layers) separated by a rib layer. This segmentation provides distinct functional zones within the pad structure, improving electrical connectivity and reliability through layered architecture while maintaining manufacturability through standardized multi-layer fabrication processes.
Data Source
AI summary
According to one embodiment, a mother board for a display device includes a rib layer having pixel apertures, and inspection pads disposed in a peripheral area. The inspection pads each have a first metal layer and a second metal layer. The rib layer has a first aperture where the second metal layer is in contact with the first metal layer. The first metal layer includes a first layer, a second layer overlapping the first layer, and a third layer overlapping the second layer. The third layer has an area exposing the second layer in the first aperture. The second metal layer has a first contact portion in contact with the second layer and a second contact portion in contact with the third layer in the area.