Flexible OLED Inorganic Layer Openings to Prevent Edge Peeling
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Solution Overview
Problem
Inorganic films with high stress used in flexible OLED display panels tend to peel off at the boundary away from the display region, particularly at the bottom border area during the preparation process, posing a challenge for bending and large-angle cover configurations.
Innovation Solution
The display panel design includes a first inorganic layer with a groove in the bendable region, an organic protection layer covering the groove, and a second inorganic layer with openings in the edge part, reducing internal stress and preventing peeling by allowing for better adhesion and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an inorganic film with large stress is used in the touch film layer to meet high bending and large-angle cover plate requirements, then the adaptability to cover plate configuration is improved, but the inorganic film may peel off at the boundary away from the display region
Solution Approach 1:
The patent divides the inorganic film structure into multiple segments: a first inorganic layer with a groove in the bendable region, and a second inorganic layer with openings at the edge. This segmentation reduces stress concentration and prevents peeling while maintaining the necessary adaptability for high bending and large-angle cover plate configurations.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the inorganic film. The first inorganic layer has a groove specifically in the bendable region to accommodate stress, while the second inorganic layer has openings at the edge region to reduce stress concentration at the boundary. This local quality approach allows the film to maintain both adaptability and peeling resistance in respective critical areas.
2Area of stationary object
If the second inorganic layer extends beyond the encapsulation layer boundary to cover the edge area, then the coverage and protection are improved, but the stress concentration at the edge increases causing peeling
Solution Approach 1:
The second inorganic layer incorporates openings (porous structure) at its edge region. This porous design reduces the continuous stress concentration that would occur in a solid extended layer, while still maintaining coverage over the encapsulation layer boundary. The openings allow stress to be distributed and released, preventing peeling at the extended edge areas.
3Reliability
If a groove is provided in the first inorganic layer in the bendable region to reduce stress, then the peeling resistance is improved, but the structural integrity may be compromised
Solution Approach 1:
The groove in the first inorganic layer is pre-formed in the bendable region before the device undergoes bending operations. This preliminary structural adjustment anticipates the stress distribution that will occur during bending, creating a stress-relief feature in advance. The groove allows the material to flex without creating catastrophic stress concentrations, thereby maintaining both peeling resistance and structural integrity during actual use.
Data Source
AI summary
A display panel has a display region and a non-display region, and the non-display region includes a second bendable region. The display panel includes a substrate, a first inorganic layer, an organic protection layer, a light-emitting function layer, an encapsulation layer, and a second inorganic layer. The second inorganic layer is disposed on a side of the encapsulation layer away from the substrate and extends from the display region to the non-display region and beyond a boundary of the encapsulation layer. A plurality of openings are provided in an edge part of the second inorganic layer away from the display region.