OLED Panel Hollow Inorganic Layer for Impact Crack Arrest
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Solution Overview
Problem
Display panels, particularly OLED displays, face challenges in impact resistance, especially in scenarios with high frequency and amplitude impacts, leading to potential fracture and compromised physical integrity.
Innovation Solution
Incorporating a hollow portion in at least one inorganic layer of the display panel, with the light-emitting device overlapping this hollow portion, and relocating pixel circuits to an adjacent region, thereby creating a buffer to arrest cracks and enhance impact resistance without affecting the display's overall arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the display panel uses a complete inorganic layer structure, then the structural integrity and manufacturing simplicity are improved, but the impact resistance deteriorates due to crack propagation risk
Solution Approach 1:
The inorganic layer is segmented into multiple discrete inorganic layers (first inorganic layer, second inorganic layer, third inorganic layer) with organic layers in between, creating a multi-layered structure that can better absorb and distribute impact stress, preventing crack propagation through the entire panel
Solution Approach 2:
The hollow portion is locally positioned in the first inorganic layer directly beneath the light-emitting device, creating a localized stress relief zone where it is most needed for impact resistance while maintaining the integrity of other structural regions
2Reliability
If hollow portions are added to the inorganic layer, then the impact resistance is improved by arresting cracks, but the manufacturing complexity increases
Solution Approach 1:
The hollow portion is pre-formed in the first inorganic layer during the manufacturing process, creating a proactive stress relief structure before the display panel is assembled and deployed, enabling it to preemptively arrest cracks before they can propagate through the entire panel
Solution Approach 2:
The hollow portion is nested within the first inorganic layer, creating a cavity structure that is integrated into the layer itself rather than being an add-on component, simplifying the overall manufacturing process by combining multiple functions into a single structural feature
3Strength
If pixel circuits are relocated to create a buffer zone, then the crack propagation is suppressed, but the device layout complexity increases
Solution Approach 1:
The display panel is segmented into distinct functional regions: a first region containing the light-emitting device with the hollow portion beneath it for impact absorption, and a second region containing the pixel circuits, creating a layout that optimizes both impact resistance and electrical connectivity
Solution Approach 2:
The hollow portion acts as an intermediary structure between the light-emitting device and the substrate, providing a buffer zone that absorbs impact energy and arrests crack propagation before cracks can reach the pixel circuits or propagate through the entire panel
Data Source
AI summary
A display panel and a display device. The display panel includes a substrate, and a driving layer and a light-emitting device located at a side of the substrate. The driving layer includes inorganic layers. At least one inorganic layer has a hollow. A display region includes a first region and a second region. The first region includes the hollow. The first region includes the light-emitting device. The light-emitting device at least partially overlaps with the hollow along a direction perpendicular to a plane of the substrate. The second region includes the light-emitting device and pixel circuits located in the driving layer. The pixel circuits coupled to the light-emitting device in the first region are located in the second region. The display region includes signal lines, coupled to the pixel circuits, located in the driving layer. At least one signal line penetrates the first and second regions in its extending direction.