Foldable Display Sealing Structure for Crack-Resistant Flexing

A protruding portion is formed on the flexible substrate at the fold line position before folding occurs. This protruding portion creates a recessed space that acts as a cushioning structure, preventing direct contact and stress concentration between folded members. The recessed space is filled with sealing material to provide additional protection, thereby preventing cracks and defects before they can form during the folding operation.

The flexible substrate is segmented by forming a protruding portion that creates a recessed space at the fold line. This segmentation divides the continuous substrate into regions separated by the recessed space, allowing each region to move independently during folding without transmitting stress to adjacent members, thus preventing crack propagation.

The protruding portion creates a recessed space that serves as a cushioning structure, protecting thin members from stress concentration during folding. This cushioning effect compensates for the reduced inherent strength of thinner members, allowing them to flex without cracking.

The sealing material filling the recessed space forms a flexible protective layer that conforms to the thin members. This flexible sealing structure provides protection without adding significant thickness, maintaining the overall flexibility while enhancing crack resistance.

The protruding portion is formed by dividing the flexible substrate into regions separated by the protrusion. This segmentation can be achieved through standard fabrication processes like photolithography and etching, adding minimal complexity while effectively preventing defects at fold lines.

The protruding portion is localized only at critical fold line positions rather than throughout the entire substrate. This localized approach provides defect protection where needed most while maintaining the simplicity of the overall substrate structure in non-critical areas.