Foldable Display OCA Layout for Crack and Overflow Control

The OCA layer is designed with different coverage requirements for different regions: the bending region requires full coverage to prevent cracks, while the non-bending region requires reduced coverage to prevent adhesive overflow. This is achieved by making the OCA layer extend to the edges of the bending region but stopping before the edges of the non-bending region, creating a locally optimized adhesive distribution that addresses different regional requirements.

The solution applies different OCA layer extension strategies to different regions: in the bending region, the OCA layer extends to the edges to provide sufficient adhesive support and prevent film layer cracks during bending; in the non-bending region, the OCA layer stops before the edges to prevent adhesive overflow. This local differentiation resolves the contradiction between preventing cracks and preventing overflow.

Instead of using a uniform OCA layer size, the invention implements a non-uniform design where the OCA layer extends to the bending region edges but stops before the non-bending region edges. This creates different adhesive distributions in different regions, optimizing stress distribution during bending while maintaining reasonable manufacturing simplicity through a clear geometric definition.