Panel-Level Stiffener Integration for Package Substrates
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Solution Overview
Problem
Conventional methods for stiffening package substrates, such as transfer molding and post-singulation attachment, are inefficient, costly, and prone to misalignment, leading to mechanical instability and increased package size due to the need for additional processing steps and re-marking, which affects throughput and yield.
Innovation Solution
Integrating stiffeners with package substrates at the panel level before singulation, using an adhesion layer to attach a panel of stiffeners to the substrates, which allows for improved alignment accuracy, reduced processing time, and elimination of re-marking, thereby enhancing mechanical integrity and reducing package size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stiffeners are attached to individual package substrates after singulation, then alignment accuracy can be achieved, but processing time and cost increase significantly
Solution Approach 1:
The patent applies preliminary action by attaching stiffeners to package substrates at the panel level before singulation. This allows alignment to be established once for the entire panel, rather than repeatedly for each individual substrate. The stiffeners are pre-positioned and secured with adhesive layers before the panel is divided into individual packages, significantly reducing total processing time while maintaining alignment accuracy through the use of alignment marks and fixtures.
2Ease of manufacture
If stiffeners are attached after singulation, then individual substrate processing is possible, but misalignment and overhang issues increase
Solution Approach 1:
The patent performs the alignment and attachment action before singulation, when the panel structure provides inherent stability and reference marks. Alignment marks are established on the panel level, and stiffeners are positioned relative to these marks before the panel is divided. This preliminary alignment ensures that when individual substrates are separated, they retain their precise alignment with stiffeners without overhang or misalignment issues.
3Volume of moving object
If package substrate thickness is decreased to minimize device size, then compactness is improved, but mechanical instability increases
Solution Approach 1:
The patent creates a composite structure by bonding stiffener materials (such as metal, ceramic, or rigid polymer) to the package substrate using adhesive layers. This composite construction provides the thin substrate with enhanced mechanical strength and dimensional stability. The stiffener acts as a reinforcement that prevents warping and bending, allowing the overall package to maintain compact dimensions while achieving the necessary mechanical stability for handling and assembly.
4Productivity
If panel level fabrication is used to reduce processing time, then productivity increases, but process complexity increases
Solution Approach 1:
The patent segments the manufacturing process into distinct panels, each containing multiple package substrates with their corresponding stiffeners. This segmentation allows parallel processing of multiple units simultaneously. The panel structure itself is divided into individual package regions with separation gaps, enabling systematic handling and subsequent singulation. This segmented approach to panel fabrication increases throughput while keeping each individual process step manageable and well-defined.
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 increases alignment accuracy, decreases package size, lowers costs, and improves throughput by minimizing misalignment and re-marking, while providing a more uniform underfill structure and higher mechanical integrity.
Implementation Method 1
integrating stiffeners with package substrates at the panel level before singulation, using an adhesion layer to attach a panel of stiffeners to the substrates
Data Source
AI summary
Techniques are disclosed for forming a package substrate with integrated stiffener. A panel of package substrates are provided. An adhesion layer is then formed on each package substrate of the panel of package substrates. A panel of stiffeners are then attached to the panel of package substrates by the adhesion layer, each stiffener corresponding to a respective package substrate. The panel of package substrates is then singulated into individual package substrates with integrated stiffeners. The stiffeners on the singulated package substrates include tabs that extend to the edges of the package substrates.