Double-Sided OLED Display Narrow Bezel via Baseplate Encapsulation
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Solution Overview
Problem
Double-sided OLED display devices face challenges in achieving a narrow bezel design due to the need for additional encapsulation layers, which also affect their moisture resistance and longevity, especially in outdoor environments.
Innovation Solution
A double-sided OLED display device design that utilizes a preserved baseplate as an encapsulation layer, eliminating the need for additional encapsulation layers, allowing for a thinner and more flexible display with enhanced moisture protection through a large-width sealant layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional encapsulation layers are used to protect the double-sided OLED display, then moisture resistance is improved, but the bezel width increases and screen-to-body ratio decreases
Solution Approach 1:
The baseplate is merged with the encapsulation function by preserving it as a soft baseplate that serves dual purposes: structural support and moisture barrier. The sealant is applied in a large-width layer that extends across the baseplate, combining sealing and encapsulation functions into a single integrated structure, eliminating the need for separate rigid encapsulation layers.
Solution Approach 2:
The soft baseplate performs multiple functions simultaneously: it provides mechanical support for the display elements, acts as a flexible encapsulation layer to prevent moisture ingress, and serves as a substrate for the large-width sealant layer. This multi-functionality reduces the overall device thickness and bezel width while maintaining protection.
2Reliability
If additional encapsulation layers are used to protect the double-sided OLED display, then moisture resistance is improved, but device thickness increases
Solution Approach 1:
The baseplate and encapsulation layer are merged into a single integrated structure. The soft baseplate itself serves as the encapsulation barrier, eliminating the need for additional separate encapsulation layers that would increase device thickness.
Solution Approach 2:
The soft baseplate acts as a flexible encapsulation film that provides moisture protection without adding significant thickness. Its flexibility allows it to conform to the display structure while maintaining an effective barrier against moisture ingress.
3Reliability
If a large-width sealant layer is used to enhance moisture protection, then moisture barrier effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The sealant application is segmented into distinct zones: a large-width central layer for primary moisture barrier function, and curved overlapping portions at the edges for enhanced sealing. This segmentation allows each zone to be optimized for its specific function while simplifying the overall manufacturing process.
Solution Approach 2:
The sealant layer is applied with curved overlapping portions at the edges of the baseplate, creating a continuous sealed barrier that follows the contour of the display structure. This curved application method enhances moisture protection at critical edge areas while maintaining manufacturing feasibility.
Data Source
AI summary
The present invention provides a double-sided organic lighting emitting diode (OLED) display device, which comprises a first display element, a second display element, a first encapsulation layer, and a second encapsulation layer. The first encapsulation layer extends from one side or two sides of the first baseplate, and curvedly overlaps on the first emitting portion. The second encapsulation layer extends from one side or two sides of the second baseplate, and curvedly overlaps on the second emitting portion. The first encapsulation layer and the second encapsulation layer both are closely encapsulated with at least one of the first baseplate and the second baseplate by sealant, respectively.