OLED Display Substrate Sealant Layout for Corner Encapsulation
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Solution Overview
Problem
Organic Light-Emitting Diode (OLED) display devices are susceptible to degradation due to water vapor and oxygen penetration, leading to oxidation of the metal and organic layers, which reduces the service life and efficiency of the device.
Innovation Solution
A display substrate with a sealant region surrounding the display area, featuring an encapsulation base layer, power lines, and signal lines arranged in specific configurations to enhance encapsulation and prevent water vapor and oxygen ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulation methods such as frame encapsulation glue and encapsulation cover plate are used to prevent water vapor and oxygen penetration, then the protection of metal layer and organic layer is improved, but the adhesion and encapsulation efficiency may be insufficient
Solution Approach 1:
The encapsulation base layer is formed in advance in the corner sealant region before the main sealant application. This preliminary structure provides a prepared foundation that enhances adhesion when the frame sealant is subsequently applied, resolving the contradiction between protection and adhesion strength.
Solution Approach 2:
The encapsulation base layer is specifically positioned in the corner sealant region where adhesion is most critical. By concentrating the encapsulation function in this specific location rather than uniformly across the entire device, the patent enhances local adhesion strength while maintaining overall protection effectiveness.
2Strength
If the encapsulation base layer is positioned to maximize contact area with sealant, then adhesion is improved, but the layout complexity of power lines and signal lines increases
Solution Approach 1:
The encapsulation structure is divided into distinct functional regions: the encapsulation base layer in the corner sealant region, and the main sealant application in other sealant regions. This segmentation allows each region to be optimized independently, maximizing adhesion in the corner while maintaining simpler layouts in other areas.
Solution Approach 2:
The patent utilizes the vertical dimension by forming the encapsulation base layer as a distinct layer structure in the corner region, rather than only horizontal placement. This dimensional approach allows the base layer to provide maximum contact area without necessarily increasing horizontal layout complexity of the power and signal lines.
Data Source
AI summary
A display substrate, a method for manufacturing the same and a display device. In the display substrate, a sealant region includes: a corner sealant region, a lead-in sealant region, and a first sealant region on a first side of a display area. The corner sealant region is provided with an encapsulation base layer. A non-display area is provided with a second power line, a gate drive circuit and multiple first signal lines configured to provide signals to the gate drive circuit. The second power line includes a power line corner portion and a first power line portion, the first power line portion overlaps the first sealant region, and the first power line portion extends in a first direction. A target portion of each first signal line is at least located in the corner sealant region.