OLED Bonding Member Crack Prevention via Localized Laser Width
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Solution Overview
Problem
Cracks in the bonding portion of organic light emitting display apparatuses can lead to moisture penetration during the manufacturing process, resulting in defective products.
Innovation Solution
Adjusting the position of a laser beam to form an effective bonding portion with a non-effective bonding portion, where the non-effective bonding portion's width is minimized adjacent to the outer portion, and the effective bonding portion's width is maximized, preventing cracks and moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bonding member is formed with uniform width around the display area, then the manufacturing process is simple, but cracks occur in the bonding portion adjacent to the outer portion causing moisture penetration
Solution Approach 1:
The bonding member is designed with non-uniform width where the width varies in different regions. Specifically, the bonding portion adjacent to the outer portion has a reduced width compared to other regions, which prevents crack formation while maintaining manufacturing simplicity through a controlled width variation pattern
2Reliability
If the bonding portion width is increased to prevent cracks, then bonding reliability improves, but the area for effective bonding adjacent to the display area decreases
Solution Approach 1:
The bonding member width is optimized locally in different regions: the portion adjacent to the outer portion has reduced width to prevent cracks, while the portion adjacent to the display area maintains sufficient width to ensure effective bonding. This spatially differentiated design simultaneously achieves crack prevention and adequate bonding area
Solution Approach 2:
The bonding member exhibits asymmetric width distribution where the width varies depending on the location relative to the display area and outer portion. This asymmetric design allows different functional requirements to be met in different regions without compromising overall performance
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
Reduces the defect rate by preventing cracks in the bonding portion adjacent to the outer portion, thereby enhancing the reliability and durability of the organic light emitting display apparatus.
Implementation Method 1
The bonding member may be melted by a laser beam irradiated onto another surface of the first substrate or onto another surface of the second substrate so as to form the bonding portion.
Data Source
AI summary
In an organic light emitting display apparatus and a method of manufacturing the same, the organic light emitting display apparatus comprises: a first substrate, one surface of which is divided into a non-display area and a display area including an organic light emitting diode (OLED); a second substrate, one surface of which faces the one surface of the first substrate; and a bonding member disposed between the first and second substrates so as to surround the display area of the first substrate, and bonding the first and second substrates to each other to define an inner portion including the display area and an outer portion including the non-display area. A bonding portion formed by the bonding member includes an effective bonding portion and a non-effective bonding portion. The non-effective bonding portion includes an inner non-effective bonding portion contacting one side of the effective bonding portion and disposed adjacent to the inner portion, and an outer non-effective bonding portion contacting another side of the effective bonding portion and disposed adjacent to the outer portion by interposing the effective bonding portion between the inner and outer non-effective bonding portions.