Radial Bump Pattern Generation for Semiconductor Packaging
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Solution Overview
Problem
Current methods for generating radial bump patterns in semiconductor packaging fail to account for thermal expansion and centrifugal forces, leading to decreased bump density and manufacturing inefficiencies.
Innovation Solution
A method for generating radial bump patterns that involves determining parameters in a precomputing phase, creating a radial pattern with rings of bump instances oriented perpendicular to a common center point, and dynamically adjusting the number of rows and bump instances based on optimization metrics to accommodate thermal expansion and centrifugal forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spacing between bumps is increased to account for thermal expansion and centrifugal forces, then reliability of connections is improved, but bump density decreases
Solution Approach 1:
The patent applies local quality by varying the spacing between bumps in different radial zones of the array. Bumps closer to the center have smaller spacing while bumps at larger radii have larger spacing to account for greater centrifugal forces and thermal expansion. This localized adjustment optimizes connection reliability at each position without unnecessarily reducing overall bump density.
Solution Approach 2:
The patent changes the spacing parameter as a function of radial distance from the center. The spacing is dynamically adjusted based on the radius, creating a gradient distribution where s(r) increases with r. This parameter change allows the system to accommodate thermal expansion and centrifugal forces while maximizing the number of bumps that can be placed.
2Manufacturing precision
If radial bump pattern is implemented to account for thermal expansion and centrifugal forces, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating the optimal spacing and positions of bumps based on expected thermal expansion and centrifugal forces. The radial pattern parameters are determined in advance during design, allowing the manufacturing process to simply follow the predetermined pattern without needing to compensate for these effects in real-time.
Solution Approach 2:
The patent introduces asymmetry by using a radial pattern where spacing varies with distance from the center rather than using a uniform symmetric grid. This asymmetric distribution better matches the physical reality of thermal expansion and centrifugal forces which also vary with radius, thereby improving manufacturing precision.
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 approach enhances bump pattern density and manufacturing efficiency by optimizing the placement of bump instances, ensuring reliable connections while maintaining mechanical and electrical integrity.
Implementation Method 1
current methods that ignore centrifugal variation and thermal expansion experienced during at least manufacturing sometimes fail due to the centrifugal variation
Implementation Method 2
current methods that ignore centrifugal variation and thermal expansion experienced during at least manufacturing sometimes fail due to the centrifugal variation
Data Source
AI summary
An approach is described for a method, system, and product for generating radial bump patterns. According to some embodiments, the approach includes determining parameters for radial pattern generation in a precomputing phase, creating a radial pattern in a second stage, and generating a layout from the radial pattern in the second stage before manufacture a device embodying the radial pattern. In some embodiments, the radial pattern comprises rings having a number of rows where bump instances are placed and rotated such that they are perpendicular to a radius from a common center line. Furthermore, in some embodiments, the number of rows in a ring is generated pursuant to a set value or dynamically generate based on one or more optimization metrics.