Chamfered Support Layer Grooves for Flexible Display Crack Prevention

The patent applies curvature by replacing sharp corners and edges in the grooves with arc-shaped transitions. Specifically, the first end and second end of each groove are designed with arc shapes instead of sharp corners, and the transition portions where grooves meet the flat portion are chamfered with arc-shaped transitions. This curvature design distributes stress more evenly during bending, preventing stress concentration and crack formation while maintaining bending flexibility.

The patent changes the geometric parameters of the groove structure by introducing arc-shaped ends and chamfered transitions. The radius of the arc shapes and the dimensions of the chamfered portions are optimized to balance bending flexibility and stress distribution. This parameter optimization allows the support layer to bend repeatedly without cracking while maintaining structural integrity.

The patent segments the support layer into different thickness regions through the groove structure. The flat portion maintains full thickness for strength, while the groove areas provide thinning for flexibility. This segmentation allows different parts of the support layer to serve different functions: the flat portions provide structural support and prevent creases, while the groove portions enable repeated bending by reducing material in the bending zones.

The patent applies local quality by making the support layer thickness non-uniform. The flat portions maintain original thickness for strength, while the groove areas are thinned locally to enhance flexibility. The transition portions use chamfered designs with gradual thickness changes. This local variation in thickness allows the support layer to simultaneously provide support strength where needed and bending flexibility where required.