Bendable Display Substrate Edge Insulation for Crack Resistance
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Solution Overview
Problem
Bendable display devices face significant stress at bending areas, leading to potential cracking issues due to uneven stress distribution, which existing technologies have not adequately addressed.
Innovation Solution
A display device design featuring a substrate with a curved first side in the additional area, where the first sensing insulating film is closer to the first side than the second sensing insulating film, and the second sensing insulating film is spaced apart from the first side by 200 μm or more, reducing stress concentration and preventing cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bendable display device is designed with conventional uniform structure, then manufacturing is simple, but stress concentration occurs at bending areas causing cracks
Solution Approach 1:
The display device structure is segmented into multiple zones along the bending direction: a first additional area with a curved first side, a second additional area, and a non-display area. This segmentation allows each zone to have optimized characteristics - the curved first side in the first additional area specifically addresses stress concentration at the bending region, while maintaining simpler structures in other areas, thus improving crack resistance without excessive overall complexity
Solution Approach 2:
The patent applies local quality by providing the curved first side configuration specifically in the first additional area where bending stress concentrates, rather than making the entire device complex. The curved geometry is localized to where it is most needed for stress distribution, allowing the rest of the device to maintain simpler, easier-to-manufacture structures
2Reliability
If the first sensing insulating film boundary is positioned closer to the first side, then stress concentration is reduced, but sensing wire space may be compromised
Solution Approach 1:
The patent resolves the space conflict by utilizing the width dimension of the first additional area. The curved first side extends into the width direction, creating additional lateral space that accommodates both the optimized insulating film positioning for stress distribution and the sensing wires. This dimensional approach allows both requirements to coexist without direct conflict
Data Source
AI summary
A display device includes a substrate including a display area, a non-display area, a first additional area connected to the non-display area at a first boundary, and a second additional area connected to the first additional area at a second boundary, pixels on the display area, an encapsulation film on the pixels, electrodes on the encapsulation film, pads on the second additional area, sensing wires connecting the electrodes and the pads, a first sensing insulating film on the encapsulation film, and a second sensing insulating film on the first sensing insulating film. The substrate includes a curved first side in the first additional area and the first additional area decreases in width from the first boundary to the second boundary, and a boundary of the first sensing insulating film is closer to the first side than a boundary of the second sensing insulating film is to the first side.