IC Metal-Layer Code for Faster Wafer Test Setup
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Solution Overview
Problem
The testing process for integrated circuits is time-consuming due to manual alignment and identification of alphanumeric labels, which are often illegible and require manual retrieval of testing information.
Innovation Solution
Incorporating a machine-readable code in a selected metal layer of the integrated circuit, readable by a scanner, to automate the testing process by providing testing information directly from storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual reading of alphanumeric labels is used for IC testing, then testing information can be retrieved, but the process is time-consuming and labor-intensive
Solution Approach 1:
The patent replaces manual mechanical reading of alphanumeric labels with an automated optical scanning system. A scanner reads machine-readable codes (such as barcodes or QR codes) printed on the IC or its packaging, automatically retrieving testing information without human intervention. This substitution of manual mechanical operations with automated optical-electronic systems directly resolves the contradiction by dramatically increasing testing speed while reducing setup time.
Solution Approach 2:
The patent uses machine-readable codes as copies of testing information that can be rapidly scanned and interpreted. Instead of requiring manual reading and interpretation of alphanumeric labels, the system creates machine-readable representations of the same information that scanners can quickly decode, enabling automatic retrieval of testing parameters and significantly improving productivity while minimizing time loss.
2Ease of operation
If alphanumeric labels are used on IC, then testing information can be identified, but the labels are often illegible and require manual retrieval
Solution Approach 1:
The patent replaces manual visual identification and retrieval processes with automated optical scanning. Machine-readable codes provide a standardized format that scanners can reliably read regardless of lighting conditions, label quality, or operator skill. This eliminates the illegibility problems of traditional alphanumeric labels and removes manual retrieval steps, thereby easing operation while reducing overall process complexity through automation.
Solution Approach 2:
The patent changes the format parameter of information encoding from human-readable alphanumeric labels to machine-readable codes. This parameter change enables automatic optical detection and interpretation, transforming the information retrieval process from a manual visual task to an automated electronic process. The new format is inherently more readable by machines and eliminates the illegibility issues that plague traditional labels, simplifying the overall testing process.
3Area of stationary object
If conventional alphanumeric labels are used, then testing information is provided, but significant space is required on the IC surface
Solution Approach 1:
The patent uses compact machine-readable codes that encode the same testing information in a much smaller physical space. These codes (such as dense barcodes or QR codes) can represent extensive testing parameters, device identifiers, and configuration data in formats that occupy minimal surface area on the IC or its packaging. This copying of information in a compressed format resolves the contradiction by preserving full information accessibility while dramatically reducing the area required.
Solution Approach 2:
The patent transitions from two-dimensional alphanumeric character arrangements to more efficient two-dimensional code structures that pack information more densely. Machine-readable codes utilize both horizontal and vertical dimensions optimally, arranging data in patterns that maximize information density. This dimensional optimization allows the same amount of testing information to be stored in a fraction of the space required by conventional labels, eliminating the trade-off between area and information accessibility.
Data Source
AI summary
An integrated circuit (IC) includes a plurality of metal layers, and a machine-readable code in a selected metal layer of the plurality of metal layers. A wafer includes a plurality of the ICs. An IC wafer testing system includes a scanner configured to read the machine-readable code in the metal layer of the IC in the wafer, and a tester configured to perform testing on the IC in the wafer based on testing information obtained from storage based on the machine-readable code. A method may include forming the IC including a plurality of metal layers and forming a selected metal layer of the IC including the machine-readable code in metal in the selected metal layer. The method may further include testing the IC. The machine-readable code reduces the complexity and time needed to setup and test an IC in a wafer.