Semiconductor Die Orientation Marking via Corner Stress Relief Patterns
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Solution Overview
Problem
Determining the orientation of sawed semiconductor dies prior to packaging is challenging, especially when they have undergone bump formation, as existing methods rely on pattern recognition which can be difficult and time-consuming, and incorrect orientation can lead to costly packaging errors.
Innovation Solution
The use of corner stress relief regions on semiconductor dies, free of devices, interconnects, and metal bumps, to create distinct metal patterns that can be easily identified using a magnifying glass, allowing for accurate orientation marking without impacting circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pattern recognition methods are used to determine die orientation, then orientation identification can be achieved, but the process becomes difficult and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-forming distinct metal patterns in corner stress relief regions during the semiconductor manufacturing process, before the dies are sawn and packaged. These pre-formed patterns serve as orientation markers that can be quickly identified later without requiring complex pattern recognition, thus reducing identification time while maintaining accuracy.
Solution Approach 2:
The patent uses simple geometric metal patterns (such as filled triangles or rectangles) in the corner stress relief regions as simplified copies or representations of orientation information. Instead of relying on complex circuit patterns for orientation identification, these simplified metal patterns serve as direct visual markers that are easy to detect and interpret, reducing both time and complexity.
2Ease of operation
If corner stress relief regions are used for metal patterns, then orientation marking becomes easy to identify, but the die structure must accommodate these additional regions
Solution Approach 1:
The patent applies self-service by utilizing the corner stress relief regions, which are already necessary structural features of the semiconductor die for mechanical stress management. By placing orientation-marking metal patterns within these pre-existing regions, the die structure serves dual purposes: maintaining structural integrity and providing built-in orientation markers, thus avoiding additional complexity.
Solution Approach 2:
The corner stress relief regions serve multiple functions: they provide mechanical stress relief for the die structure and simultaneously serve as locations for orientation-marking metal patterns. This multi-functionality eliminates the need for separate orientation marking structures, maintaining ease of identification without increasing overall device complexity.
3Manufacturing precision
If distinct metal patterns are formed in corner regions, then orientation can be accurately marked, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the orientation marking function with the existing metal interconnect layers and corner stress relief region formation processes. By integrating the metal pattern formation into the standard semiconductor manufacturing flow rather than adding separate marking steps, the precision of orientation marking is achieved without significantly complicating the manufacturing process.
Data Source
AI summary
Mechanisms for identifying orientation of a sawed die are provided. By making metal pattern in the corner stress relief region in one corner of the die different from the other corners, users can easily identify the orientation of the die.