OLED Packaging Reinforcement for Flexible Bending Stress
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Solution Overview
Problem
Flexible OLED devices face premature failure due to damage from repeated bending, as their packaging is vulnerable to water vapor and oxygen, leading to erosion of the Hole Transport Layer and Electron Transport Layer, and the cathode reacts with environmental gases, reducing the device's lifespan.
Innovation Solution
Incorporating a reinforcement part in the packaging layer, specifically a thickened or thinned organic layer, at predefined bending regions of the OLED display screen to increase the bending radius and reduce stress, thereby enhancing the durability and longevity of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard packaging layer is used in flexible OLED devices, then the device can be manufactured with conventional processes, but the packaging layer is easily damaged by repeated bending actions, reducing device reliability
Solution Approach 1:
The patent applies local quality by creating a thickened portion of the organic layer specifically at the predefined bending region, while maintaining standard thickness in other areas. This localized reinforcement provides enhanced durability at the vulnerable bending region without complicating the overall manufacturing process or requiring different materials throughout the entire packaging layer.
Solution Approach 2:
The patent implements preliminary action by pre-forming the thickened portion of the organic layer during the manufacturing process at the bending region before the device is put into service. This advance reinforcement prepares the packaging layer to withstand future repeated bending actions, preventing damage before it occurs and extending device lifespan.
2Strength
If the organic layer thickness is increased at the bending region to reinforce the packaging, then the bending stress is reduced, but the device structure becomes more complex and manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by modifying the thickness parameter of the organic layer locally at the bending region, creating a thickened portion with controlled incremental thickness. This approach enhances strength at the critical bending region while using standard manufacturing processes, balancing the need for reinforcement with manufacturing feasibility and precision requirements.
Data Source
AI summary
The present application discloses an OLED display screen and a display apparatus including the display screen and a method of manufacturing the OLED display screen. The OLED display screen includes a flexible substrate, an OLED device and a packaging layer; wherein, the packaging layer includes a reinforcement part located in a predefined bending region of the display screen.