IC Packaging with Vertical Vias for High-Density I/O

The patent transitions from planar I/O connections to three-dimensional vertical connections by forming conductive vias through the molding compound. This allows I/O signals to be routed vertically through the package thickness, enabling fine pitch connections without increasing lateral complexity. The via-based interconnect structure resolves the contradiction by adding a vertical dimension to the interconnection architecture.

The patent segments the I/O connection function into multiple independent via structures distributed throughout the molding compound. Rather than relying on a single planar connection layer, the I/O paths are divided into multiple vertical via segments that can be independently formed and positioned, enabling precise control over connection pitch and improving manufacturing reliability.

The patent utilizes the vertical dimension within the package thickness to accommodate multiple I/O connections. By routing signals through vertically extending vias rather than requiring lateral expansion, the design enables increased I/O count without proportionally increasing package footprint. This vertical interconnection approach allows high-density I/O integration within a compact three-dimensional volume.

The patent implements a nested interconnection architecture where conductive vias are embedded within the molding compound, and additional functional layers are integrated around these vias. This nested structure allows multiple I/O connections and support structures to be packed into the available volume efficiently, enabling high functionality within a minimized package envelope.

The patent performs preliminary formation of conductive vias through the molding compound before final package assembly and wire bonding. By pre-establishing the vertical interconnection pathways during the molding process itself, the subsequent wire bonding and assembly steps are simplified. This preliminary via formation reduces overall manufacturing complexity despite the fine pitch requirements.

The molding compound serves a dual function: it provides mechanical encapsulation and protection while simultaneously serving as the medium in which conductive vias are formed. The via formation process utilizes the molding compound's own material properties and processing conditions, eliminating the need for separate via drilling or etching steps. This self-service approach reduces manufacturing complexity while achieving high I/O density.