Fan-Out Wafer Level Packaging for Compact Integrated Devices

The packaging structure is segmented into multiple functional layers: reconstitution wafer, redistribution layers (RDL), and connection layers. This segmentation allows independent optimization of each layer for flexibility while maintaining overall structural integrity, resolving the contradiction between design flexibility and structural complexity.

The patent transitions from planar bond pad placement to three-dimensional stacked architecture with vertical interconnections. By adding the vertical dimension through multiple packaging layers and connection layers, the system achieves enhanced design flexibility without proportionally increasing lateral complexity.

The patent resolves the interconnect count limitation by transitioning from two-dimensional planar interconnections to three-dimensional vertical interconnections. Multiple connection layers stacked vertically provide numerous interconnect pathways within a small footprint, enabling high interconnect count without increasing chip area.

The packaging structure employs nested layers where redistribution layers and connection layers are stacked one upon another. This nesting approach maximizes the number of interconnects by utilizing vertical space efficiently, allowing numerous interconnections to be packed into a minimal footprint.

The patent achieves high interconnect count without large footprint by exploiting the vertical dimension. Multiple connection layers are stacked vertically with dense interconnect routing, allowing numerous connections to be accommodated within a compact lateral footprint through three-dimensional space utilization.

The redistribution layers are implemented as thin, flexible conductive films that can be routed densely and configured in complex patterns. These thin film structures enable high interconnect density without requiring large lateral space, as the flexibility allows efficient space utilization in the vertical stacking direction.