OLED Support Layer Segmentation for Mask Contamination
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Solution Overview
Problem
Conventional organic light-emitting display panels face issues with contamination of vapor deposition masks due to large contact areas between support layers and masks, leading to particle contamination and increased encapsulation layer thickness, which affects flexibility and causes color mixing during vapor deposition.
Innovation Solution
The introduction of a support layer with an annular organic part, which reduces the contact area with the mask and includes a metal part and an annular organic part formed using a reflective layer, thereby minimizing particle contamination and encapsulation layer thickness, while also reducing the shadow effect during vapor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional support layer is used with large contact area, then structural support is provided, but particle contamination increases and encapsulation layer thickness increases
Solution Approach 1:
The support layer is segmented into a metal part and an annular organic part, creating a composite structure that reduces the contact area with the mask while maintaining structural support functionality. This segmentation allows the support layer to provide necessary support with minimized contamination risk.
Solution Approach 2:
The support layer is formed as a composite structure combining a metal part and an annular organic part. This composite design reduces the overall contact area with the mask compared to conventional solid support layers, thereby reducing particle contamination while maintaining structural integrity.
2Reliability
If encapsulation layer thickness is increased to prevent contamination, then protection is improved, but flexibility is reduced
Solution Approach 1:
The support layer with reduced contact area is constructed in advance to prevent particle contamination at the source. By minimizing the contact area between the support layer and mask during vapor deposition, the need for thick encapsulation layers is reduced, thereby maintaining flexibility while providing adequate protection.
3Manufacturing precision
If contact area between support layer and mask is large, then structural support is adequate, but color mixing occurs during vapor deposition
Solution Approach 1:
The support layer is divided into a metal part and an annular organic part, creating a segmented structure that reduces the contact area with the mask. This segmentation prevents color mixing during vapor deposition by minimizing the area where particles could contaminate the mask and cause color mixing issues.
Data Source
AI summary
Provided is an organic light-emitting display panel, including: an array substrate, an organic light-emitting element arranged on the array substrate, and an encapsulation portion; the organic light-emitting element includes a reflective layer, a pixel definition layer including pixel definition parts, a light-emitting pixel layer including light-emitting pixel parts each arranged between the pixel definition parts, a cathode layer arranged on a side of the light-emitting pixel layer away from the reflective layer, and a support layer arranged between at least one pair of adjacent light-emitting pixel parts of the light-emitting pixel layer; the support layer includes a metal part and an annular organic part placed on a side of the metal part away from the array substrate; the encapsulation portion includes at least one organic encapsulation layer and at least one inorganic encapsulation layer; and the encapsulation portion covers the organic light-emitting element.