Flexible OLED Display Structure With Rounded Substrate Corners
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Solution Overview
Problem
Conventional OLED displays experience stress concentration at right-angle transitions between rigid substrates and flexible OLED layers, leading to premature breakage of metal film layers due to sharp angles, which reduces the service life of the electronic display devices.
Innovation Solution
The electronic display device incorporates a rigid substrate with a convex rounded surface or rounded corners at the transition areas, where the flexible OLED layer is in contact, to distribute stress uniformly and minimize concentration, with the radius of curvature optimized to be equal to or half the thickness of the substrate for effective stress reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid substrate with right-angle transitions is used to support the flexible OLED layer, then the structural support and rigidity are provided, but stress concentration occurs at the sharp corners leading to premature breakage of metal film layers
Solution Approach 1:
The patent applies curvature by rounding the corners of the rigid substrate where the flexible OLED layer makes contact. Instead of sharp right-angle transitions, the substrate features rounded corners with a specific radius of curvature. This geometric modification eliminates stress concentration points, allowing stress to distribute evenly across the contact area, thereby preventing metal film layer breakage and extending device service life while maintaining structural support
2Shape
If the flexible OLED layer is bent at sharp angles to conform to the substrate, then the device achieves a compact form factor, but the metal film layers experience high stress and breakage
Solution Approach 1:
The patent modifies the bending geometry by introducing rounded corners on the rigid substrate. The flexible OLED layer conforms to these rounded corners rather than sharp angles, creating a gradual transition that reduces stress concentration. The radius of curvature is specifically designed to balance compact form factor with stress distribution, preventing metal film layer breakage while achieving space-efficient device geometry
Data Source
AI summary
The present disclosure relates to an electronic display device, including a rigid substrate including a first surface, a second surface opposite the first surface, and a side surface coupled between the first surface and the second surface, a flexible OLED layer including a first body segment extending over the first surface of the rigid substrate to form a display front surface of the electronic display device, a second body segment extending over the second surface of the rigid substrate to form a back surface of the electronic display device, and a bent segment coupled between the first body segment and the second body segment, and a functional component coupled to the second body segment of the flexible OLED layer to implement a display function of the electronic display device, the functional component being hidden on the back surface of the electronic display device.