Stress Buffer Layered Vias for Flexible Display Reliability

The patent applies composite materials by combining organic resin materials with inorganic insulation layers to form a layered structure. The organic layer is positioned between the inorganic insulation layer and the metal layer, creating a composite structure that leverages the flexibility and stress-absorbing properties of organic materials while maintaining the insulating and structural properties of inorganic materials. This composite approach prevents crack propagation from the inorganic layer to the metal layer during bending operations.

The organic resin layer serves as an intermediary between the inorganic insulation layer and the metal layer. When stress occurs during bending, this intermediate layer absorbs and dissipates the stress, preventing direct stress transfer from the rigid inorganic insulation layer to the metal layer. This mediator function blocks the propagation path of cracks that would otherwise travel from the insulation layer to the metal layer.

The patent uses composite materials to maintain insulation layer integrity while reducing overall thickness. By combining thin inorganic insulation layers with organic resin layers, the structure achieves adequate insulation and mechanical strength without requiring a thick single-layer insulation layer. The composite structure provides both the thinness required for modern displays and the reliability needed to prevent fracture during bending.

The patent changes the material parameters by introducing organic resin materials with different mechanical properties compared to inorganic insulation layers. The organic layer has higher flexibility and lower modulus of elasticity, allowing it to accommodate bending stresses that would cause fracture in thinner inorganic layers. This parameter change enables the use of thinner overall structures without sacrificing reliability.