IC Packaging Thermal Structure with Tapered Cavity
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Solution Overview
Problem
The challenge lies in creating an integrated circuit packaging system that balances size reduction, increased functionality, speed, and reliability while managing thermal dissipation effectively, as existing solutions fail to adequately address heat build-up and structural stress induced by temperature differentials in shrinking package sizes.
Innovation Solution
The system incorporates a base substrate with a package stack assembly, a thermally conductive encapsulation featuring a tapered cavity, a recessed circuitry unit with non-parallel chambers, and a thermal structure mounted over the circuitry unit and encapsulation, utilizing thermal adhesive to enhance heat transfer and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If package size is reduced to meet market demand for smaller electronic products, then product size decreases and market competitiveness improves, but thermal dissipation capability deteriorates and heat build-up increases
Solution Approach 1:
The patent introduces a tapered cavity structure within the encapsulation that extends vertically, creating a three-dimensional thermal management solution. The cavity has a larger surface area at the top than at the circuit board interface, forming a tapered geometry that increases thermal dissipation surface area without increasing the horizontal package footprint. This dimensional approach allows heat to be dissipated through the vertical dimension while maintaining a compact horizontal profile.
Solution Approach 2:
The patent applies different thermal properties to different regions of the package. The encapsulation material surrounding the cavity provides thermal insulation in certain areas while the tapered cavity walls provide enhanced thermal dissipation pathways. The thermal adhesive is selectively applied to specific surfaces (circuit board, tapered cavity, recessed circuitry unit) to create localized thermal conduction pathways. This local differentiation of thermal properties allows simultaneous heat isolation and heat dissipation in different regions.
2Volume of moving object
If package size is reduced, then product size decreases, but structural stress induced by temperature differentials increases
Solution Approach 1:
The patent creates localized thermal management zones within the package structure. The tapered cavity and recessed circuitry unit form specific regions with enhanced thermal dissipation capabilities, while the surrounding encapsulation material provides thermal isolation. This local differentiation allows temperature differentials to be managed in specific areas, reducing overall thermal stress on the compact package structure.
Solution Approach 2:
The patent introduces thermal adhesive as an intermediary material between the circuit board, tapered cavity, and recessed circuitry unit. This thermal adhesive layer facilitates controlled thermal conduction pathways, allowing heat to be transferred efficiently through designated interfaces while the surrounding encapsulation material acts as a thermal barrier. This intermediary approach manages temperature gradients and reduces thermal stress in the compact package.
3Adaptability or versatility
If electrical connections and functionality are increased, then performance improves, but thermal dissipation becomes more difficult
Solution Approach 1:
The patent utilizes the vertical dimension within the encapsulation to create thermal management features. The tapered cavity extends vertically with increasing surface area toward the top, providing a three-dimensional thermal dissipation pathway that does not conflict with the horizontal arrangement of electrical connections and circuitry. This vertical thermal management approach allows increased functionality at the circuit level while maintaining effective heat dissipation through the vertical dimension.
Solution Approach 2:
The patent segments the encapsulation structure into distinct functional regions: the tapered cavity for thermal dissipation, the recessed circuitry unit for electrical functionality, and the surrounding encapsulation material for protection and thermal isolation. This segmentation allows each region to be optimized for its specific function - thermal management, electrical connectivity, or structural protection - without compromising the others.
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
This configuration effectively eliminates heat build-up, reduces intrinsic operating temperatures, and prolongs product life by deflecting radiated heat and maximizing thermal absorption, thereby improving reliability and preventing structural failures due to temperature differentials.
Implementation Method 1
mounting a thermal structure over the recessed circuitry unit, the cavity, and the encapsulation
Implementation Method 2
deflecting radiated heat and maximizing thermal absorption
Data Source
AI summary
A method of manufacture of an integrated circuit packaging system includes: providing a base substrate; attaching a package stack assembly, having a contact pad, on the base substrate; applying an encapsulation having a cavity with a tapered side directly over the package stack assembly, the contact pad exposed in the cavity; attaching a recessed circuitry unit in the cavity and on the contact pad, a chamber of the cavity formed by the recessed circuitry unit and the tapered side of the cavity; and mounting a thermal structure over the recessed circuitry unit, the cavity, and the encapsulation.