Semiconductor Circuitry Cover Using Stencil-Applied Insulation
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Solution Overview
Problem
Existing methods for protecting active circuitry on semiconductor devices, such as MEMS or resonators, are inefficient and often require complex processes, leading to larger package sizes and higher costs.
Innovation Solution
A method involving a stencil mask to apply a viscous insulating material over the active circuitry, forming a planar cover that is then encapsulated with a mold compound, allowing for smaller package sizes and simpler processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex plasma etch processes are used to protect active circuitry, then protection reliability is improved, but device complexity and processing cost increase
Solution Approach 1:
The patent extracts and removes the complex plasma etch process from the packaging workflow, replacing it with a simpler stencil mask and viscous material application process. This eliminates the need for sophisticated plasma equipment and process control while maintaining protection effectiveness for active circuitry like MEMS and resonators.
Solution Approach 2:
The patent employs disposable stencil masks that are applied and then discarded, replacing expensive and complex plasma etch processes. The stencil mask is a simple, low-cost tool that defines the protection area and is removed after the viscous insulating material is applied, eliminating the need for complex reusable plasma equipment.
2Reliability
If complex plasma etch processes are used to protect active circuitry, then protection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs disposable stencil masks that are applied and then discarded, replacing expensive and complex plasma etch processes. The stencil mask is a simple, low-cost tool that defines the protection area and is removed after the viscous insulating material is applied, eliminating the need for complex reusable plasma equipment.
Solution Approach 2:
The patent extracts and removes the complex plasma etch process from the packaging workflow, replacing it with a simpler stencil mask and viscous material application process. This eliminates the need for sophisticated plasma equipment and process control while maintaining protection effectiveness for active circuitry like MEMS and resonators.
3Reliability
If traditional protection methods are used, then active circuitry is protected, but package size increases
Solution Approach 1:
The patent applies protection locally only where active circuitry is located on the die surface, rather than covering the entire die or package. The stencil mask defines precise openings that allow viscous insulating material to be applied only over active circuitry areas such as MEMS and resonators, minimizing the volume of protection material and reducing overall package size.
Solution Approach 2:
The patent applies partial action by protecting only the necessary active circuitry areas rather than the entire die surface. The stencil mask openings are sized and positioned to cover only the active circuitry that requires protection, avoiding unnecessary material application and reducing package volume.
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
The solution effectively protects active circuitry while enabling smaller package sizes and reducing processing costs by avoiding complex plasma etch processes.
Implementation Method 1
urging a viscous insulating material through the stencil opening to cover at least the portion of the area of the die that includes the active circuitry
Data Source
AI summary
An example method includes providing a substrate that includes a first substrate surface and a die on the first substrate surface, in which the die includes active circuitry within an area at or near an exposed die surface of the die that is spaced from the first substrate surface. The method also includes placing a stencil mask over the first substrate surface, in which the stencil mask includes a stencil opening over at least a portion of the area of the die that includes the active circuitry. The method also includes urging a viscous insulating material through the stencil opening to cover at least the portion of the area of the die that includes the active circuitry.