Conformal 3D Circuit Attachment for Non-Planar Substrate Alignment
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Solution Overview
Problem
Conventional bonding and packaging techniques face challenges in attaching three-dimensional heterogeneous integration structures, particularly when they are rotated or edge-mounted, due to issues with precision lateral alignment, thermal expansion, and mechanical misalignment, which affect integration density and reliability.
Innovation Solution
Implementing topography-conforming mechanisms that adapt the communication face of three-dimensional integrated circuits to match the warped or thermally deformed host substrate, using inductive coupling, mechanical locking structures, and flexible interfaces to ensure secure and repeatable integration across varying substrate types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional bonding and packaging techniques are used for three-dimensional heterogeneous integration, then traditional face-down packaging geometries can be achieved, but precision lateral alignment becomes difficult when structures are rotated or edge-mounted
Solution Approach 1:
The patent employs dynamic alignment mechanisms including compliant mounting structures that can flex and adapt to accommodate rotational and edge-mounted orientations of three-dimensional integrated circuits. These structures allow the package to dynamically adjust its configuration based on the desired mounting orientation, enabling precise lateral alignment across multiple packaging geometries including face-down, edge-mounted, and rotated configurations
Solution Approach 2:
The invention utilizes parameter changes in the mounting structure's physical state, allowing transition between rigid and compliant states during assembly. The compliant mounting structures can change their mechanical properties to facilitate alignment in different orientations, then lock into precise positions once mounted, enabling both versatility in geometry and precision in alignment
2Productivity
If integration density increases with non-planar or cube-style configurations, then three-dimensional heterogeneous integration capability is improved, but conventional bonding techniques become difficult to scale and align
Solution Approach 1:
The patent segments the three-dimensional integrated circuit into modular cube-style structures that can be independently manufactured and then assembled. This segmentation allows each cube to be prepared separately with standardized interfaces, enabling scalable assembly processes where multiple cubes can be integrated systematically without increasing complexity, thus maintaining ease of manufacture while achieving high integration density
Solution Approach 2:
The invention transitions from traditional two-dimensional planar packaging to three-dimensional cube-style configurations stacked vertically. This dimensional change allows integration density to increase by utilizing the Z-axis (vertical stacking) rather than expanding laterally, while the compliant mounting structures enable these three-dimensional assemblies to be manufactured using scaled versions of conventional bonding techniques
3Manufacturing precision
If precision lateral alignment is attempted in the presence of thermal expansion, then alignment accuracy may be maintained, but mechanical misalignment occurs under operating conditions
Solution Approach 1:
The patent explicitly accounts for thermal expansion by designing the compliant mounting structures with materials and geometries that compensate for thermal growth. The structures are engineered to expand and contract with temperature changes while maintaining alignment, using controlled compliance to absorb thermal mismatch between different materials in the heterogeneous integration stack
Solution Approach 2:
The invention incorporates alignment compensation features that are built into the mounting structure before assembly. These features include compliant elements and adjustable mechanisms that anticipate and cushion against misalignment caused by thermal expansion and mechanical stress during operation, ensuring alignment stability without requiring post-assembly adjustments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances integration yield and reliability by minimizing gaps and maintaining signal integrity across non-planar surfaces, reducing mechanical stress, and accommodating thermal expansion, while eliminating the need for traditional underfill and rigid adhesives.
Implementation Method 1
Precision lateral alignment of cube structures to host substrates in the presence of thermal expansion can be difficult
Implementation Method 2
a. a flexible semiconductor interface layer including a plurality of interface input-output devices; b. a flex circuit substrate configured to route electrical signals
Implementation Method 3
using inductive coupling, mechanical locking structures, and flexible interfaces to ensure secure and repeatable integration
Data Source
AI summary
Various aspects relate to three-dimensional integrated circuits including a plurality of conformal integrated circuit slices stacked one upon the other. The plurality of conformal integrated circuit slices includes various components. A communication face defines a communication surface configured to conform to a portion of a topography of a non-planar host substrate. A plurality of input-output devices is configured to communicate to a corresponding plurality of host-side input-output devices associated with the non-planar host substrate.