Flexible Display Inorganic Insulating Layer Slit Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible display devices using resin substrates are prone to cracking of inorganic insulating layers when bent, leading to damage of lines due to bending stress, especially when the curvature radius is small.
Innovation Solution
Incorporating slits in the inorganic insulating layers of the display device's second area, where the pitch of lines is increased, and a light-shielding layer with a wider width, to reduce stress and prevent cracking during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display area is bent with small radius of curvature, then flexibility and adaptability are improved, but inorganic insulating layers crack and lines are damaged due to bending stress
Solution Approach 1:
The inorganic insulating layer is divided into multiple regions with different pitches. The first area has a first pitch suitable for pixel arrangement, while the second area has a second pitch (greater than the first pitch) that provides stress relief during bending, preventing cracks while maintaining flexibility
Solution Approach 2:
Different areas of the display device are given different structural properties. The first area maintains standard pitch for optimal pixel density and image quality, while the second area uses increased pitch specifically to reduce bending stress and prevent cracking in flexible applications
2Reliability
If the pitch of lines is increased in the second area, then stress during bending is reduced, but line density and resolution are decreased
Solution Approach 1:
The display area is segmented into a first area with standard line pitch for high resolution and a second area with increased pitch for stress relief. This segmentation allows each region to optimize its function without compromising the other
Solution Approach 2:
The line pitch is locally adjusted based on functional requirements. The first area maintains fine pitch for pixel definition, while the second area uses coarser pitch specifically where stress relief is needed during bending
Data Source
AI summary
According to one embodiment, a display device includes a flexible base, a display area, first lines arranged in a first direction, pixel electrodes, and a first inorganic insulating layer contacting the lines. The display area includes a first area in which the lines are arranged in the first direction at a first pitch and a second area in which the lines are arranged in the first direction at a second pitch greater than the first pitch, and the second area is located between the first area and an edge of the base in the first direction. In the second area, the first inorganic insulating layer comprises a first slit extending along the lines between adjacent lines.