OLED Seal Support Structure for Uniform Cutting Pressure
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Solution Overview
Problem
The existing organic light-emitting display apparatuses face issues with exfoliation and cutting defects due to non-uniform pressure distribution during the cutting process, primarily at the corners of the display units, where the seal's curved shape fails to adequately support the cutting instrument, leading to incomplete cuts and surface irregularities.
Innovation Solution
Incorporating a support structure between the substrates and the seal, which is positioned around the corner of the seal to enhance pressure distribution and prevent defects, using films that form part of the thin film transistor, such as pixel-defining, via, source and drain, interlayer, gate, and gate insulating films, to ensure uniform cutting and minimize stress on the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal with curved shape is used to couple substrates, then the seal can provide flexibility and coverage, but the corner regions fail to provide adequate support during cutting, leading to exfoliation and cutting defects
Solution Approach 1:
The support structure is segmented into multiple regions: a first support region with a first curvature radius and a second support region with a second curvature radius. This segmentation allows each region to provide optimized support characteristics - the first region prevents exfoliation while the second region prevents cutting defects, resolving the contradiction between seal reliability and cutting precision.
Solution Approach 2:
Different curvature radii are applied to different regions of the support structure. The first support region has a first curvature radius optimized for preventing exfoliation, while the second support region has a second curvature radius optimized for preventing cutting defects. This local differentiation of geometric properties allows simultaneous optimization of both seal reliability and cutting precision.
2Strength
If the seal is positioned to cover the display circumference, then the display is protected and coupled, but the corner regions create non-uniform pressure distribution during cutting, causing incomplete cuts and surface irregularities
Solution Approach 1:
The support structure is pre-formed with specific curvature radii in different regions before the cutting process. The first support region with its specific curvature is prepared in advance to prevent exfoliation, and the second support region is prepared to prevent cutting defects. This preliminary structuring ensures uniform pressure distribution during cutting, making the manufacturing process easier while maintaining strong seal protection.
Solution Approach 2:
The curvature radius parameter is varied across different regions of the support structure. The first region has a first curvature radius and the second region has a second curvature radius, creating non-uniform geometric parameters that optimize both protection strength and cutting ease. This parameter differentiation resolves the contradiction between strong protection and easy manufacturing.
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 support structure ensures a uniform cut surface by maintaining consistent pressure during cutting, reducing the likelihood of cracks and burrs, and prevents exfoliation by compensating for the seal's shape, thereby improving the manufacturing process and reducing defects.
Implementation Method 1
melting the seal to couple the mother substrate to the opposite mother substrate
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate, a display disposed on the substrate, an opposite substrate disposed to face the substrate with the display therebetween, a seal disposed between the substrate and the opposite substrate to couple the substrate to the opposite substrate and arranged around an outer circumference of the display such that the display is located inside the seal, and a support disposed between the substrate and the opposite substrate and arranged around a corner of the seal so that the corner of the seal is located inside the support.