Stretchable OLED Substrate Cathode Connection Design
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Solution Overview
Problem
Existing OLED display panels with stretchable designs suffer from poor display effects due to large gaps between display regions, leading to reduced stretch resistance and increased risk of cracks when stretched, which affects the performance of OLED devices.
Innovation Solution
The OLED display substrate features a plurality of display regions separated by a spacer region with stretchable cathode connection lines, where cathodes of OLED devices in each region are connected through a via hole in the insulating layer, allowing for improved stretchability and reduced stress on the display regions, thereby enhancing the substrate's resistance to stretching forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display regions are separated by large gaps to accommodate stretchable design, then stretchability is improved, but display effect deteriorates due to reduced aperture ratio
Solution Approach 1:
The patent employs flexible cathode connection lines that can be stretched without breaking, allowing the display regions to be separated by larger gaps while maintaining electrical connectivity. This flexible connection structure enables the display panel to achieve stretchability while minimizing the impact on aperture ratio, as the connection lines can be designed to occupy minimal space even when accommodating large separations between display regions.
2Adaptability or versatility
If display regions are separated by large gaps, then stretchability is improved, but structural strength deteriorates increasing crack risk
Solution Approach 1:
The cathode connection lines are designed with flexible materials and structures that can undergo stretching deformation without breaking. These flexible connections distribute mechanical stress away from the OLED devices and towards the connection lines themselves, which are specifically engineered to handle tensile forces. This prevents stress concentration at the gaps between display regions, thereby maintaining structural integrity and crack resistance even when large gaps are present for stretchability.
3Device complexity
If cathodes of OLED devices are connected through via hole in insulating layer, then manufacturing complexity is reduced, but stress concentration increases at via hole location
Solution Approach 1:
The patent reinforces the via hole regions with additional structural support or stress-distributing features localized at these critical points. The insulating layer or surrounding structures are designed with enhanced mechanical properties specifically at the via hole locations to prevent stress concentration from causing failures. This localized reinforcement maintains the simple via hole connection structure while compensating for the potential weakness at these specific points.
Data Source
AI summary
An OLED display substrate and a display panel are provided. The OLED display substrate includes: plural display regions and a spacer region separating the plural display regions from each other, each display region having plural pixel units disposed therein, and each pixel unit including plural OLED devices respectively emitting light of different colors; a first cathode connection line and an insulating layer disposed in at least one display region and sequentially disposed between a base substrate and the plural OLED devices, cathodes of all OLED devices located in a same display region having a one-piece structure; a via hole arranged in the insulating layer, the cathodes of all OLED devices located in the same display region being connected to the first cathode connection line through the via hole; and a second cathode connection line disposed in the spacer region and connected to the first cathode connection line.