Die Over-Shift Indicating Pattern for Semiconductor Package Alignment
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Solution Overview
Problem
As semiconductor packages are scaled down, detecting whether the semiconductor die is properly aligned with the package substrate becomes challenging, leading to potential cracks and failures due to reduced side margins, which can result in moisture infiltration and reliability issues.
Innovation Solution
Incorporating a die over-shift indicating pattern on the package substrate, which serves as a visual reference to determine if the semiconductor die is within an allowable attachment tolerance, allowing for easy inspection without high-magnification tools and preventing die attachment failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If semiconductor packages are scaled down to reduce form factor, then compactness is improved, but measurement precision deteriorates due to difficulty in detecting die alignment
Solution Approach 1:
The patent introduces a die over-shift indicating pattern as an intermediary reference element on the package substrate. This pattern serves as a mediator between the die attachment region and inspection tools, enabling alignment detection without requiring direct high-magnification observation of the tiny die itself. The reference pattern provides visible markers that facilitate measurement at scaled-down package sizes.
Solution Approach 2:
The patent creates a reference copy or representation of the die attachment region through the die over-shift indicating pattern. This pattern replicates key alignment features at a larger, more easily observable scale, allowing inspectors to assess die placement accuracy by referencing the pattern rather than directly measuring the miniature die position.
2Measurement precision
If high-magnification inspection tools are used to detect die misalignment, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The die over-shift indicating pattern creates a simplified visual representation of alignment status that can be inspected with basic magnification tools. Instead of requiring complex high-magnification equipment to directly measure die position, the reference pattern provides an enlarged, easier-to-observe copy of alignment information that reduces inspection tool requirements.
Solution Approach 2:
The patent transforms the measurement parameter from direct die position measurement (requiring high magnification) to reference pattern position measurement. By changing what is being measured from the tiny die itself to the larger reference pattern on the substrate, the inspection can be performed with simpler, lower-magnification tools while maintaining measurement capability.
3Manufacturing precision
If die attachment tolerance is reduced to improve manufacturing precision, then side margin is improved, but reliability deteriorates due to increased risk of cracks and moisture infiltration
Solution Approach 1:
The die over-shift indicating pattern enables preliminary detection of excessive die attachment offset before final package sealing. By providing visible reference markers, the pattern allows inspectors to identify and reject packages with misaligned dies before encapsulation, preventing potential reliability issues from developing in the first place.
Solution Approach 2:
The reference pattern provides visual feedback on die placement accuracy. Inspectors can immediately determine whether a die is properly aligned or excessively offset by comparing its position against the die over-shift indicating pattern, enabling real-time quality control decisions to maintain reliability.
Data Source
AI summary
A semiconductor package includes a package substrate including a die attachment region, a semiconductor die attached to the die attachment region, and a die over-shift indicating pattern disposed on or in the package substrate and spaced apart from the die attachment region. The die over-shift indicating pattern is used as a reference pattern for obtaining a shifted distance of the semiconductor die.