Repairable Matrix-Addressed Interconnects for High-Yield Device Placement
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Solution Overview
Problem
Existing matrix-addressed systems face challenges in efficiently connecting small integrated circuits to destination substrates due to manufacturing variability, particle contamination, and the need for complex and costly photolithographic processes, which limits their scalability and reliability.
Innovation Solution
A repairable matrix-addressed system is developed, featuring a substrate with electrically conductive row and column lines and line segments, allowing for robust electrical interconnections and easy device placement through micro-transfer printing, with the ability to test and replace faulty devices, ensuring high-resolution matrix-addressing despite manufacturing and material variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photolithographic processes are used to connect integrated circuits to substrates, then electrical connections can be established, but the process becomes complex and costly
Solution Approach 1:
The patent extracts the connection function from the complex photolithographic process by introducing dedicated connection posts that protrude from the substrate surface. These connection posts provide direct mechanical and electrical contact points, eliminating the need for complex photolithographic patterning and multiple processing steps while maintaining reliable electrical connections.
Solution Approach 2:
The connection posts serve as intermediary elements between the integrated circuits and the substrate. By providing these dedicated connection structures, the patent simplifies the interface between components and substrate, replacing complex photolithographic processes with direct mechanical insertion and contact.
2Ease of manufacture
If manufacturing processes are simplified, then production costs decrease, but manufacturing variability and particle contamination increase
Solution Approach 1:
The connection posts are pre-formed on the substrate before integrated circuit placement. This preliminary action ensures that connection points are already prepared and positioned accurately, reducing variability during assembly. The substrate is pre-configured with connection posts at specific locations, which then guide and standardize the placement of integrated circuits.
Solution Approach 2:
The patent replaces complex photolithographic and chemical processes with a mechanical system based on physical connection posts. This mechanical approach uses straightforward insertion and contact mechanisms, which are more tolerant of manufacturing variations and less sensitive to particle contamination compared to delicate photolithographic processes.
3Measurement precision
If high-resolution devices are placed on large substrates, then system performance improves, but connection reliability decreases due to manufacturing variability
Solution Approach 1:
The substrate is segmented with multiple discrete connection posts distributed across its surface, each serving as an independent connection point. This segmentation allows high-resolution devices to be placed at precise locations while maintaining reliable connections through dedicated posts at each connection point, isolating connection reliability from overall manufacturing variability.
Solution Approach 2:
The connection posts provide localized high-quality connection points with precise geometry and material properties optimized for electrical contact. Each connection post is locally engineered with specific dimensions, materials, and surface characteristics to ensure reliable connections, while the rest of the substrate can be manufactured with standard processes.
4Reliability
If defective devices are identified and replaced, then system reliability improves, but repair complexity increases
Solution Approach 1:
The modular connection post design allows individual integrated circuits to be independently accessed and replaced. Each device is connected through its own connection posts, enabling selective removal and replacement of defective devices without affecting other components, simplifying repair procedures while maintaining system reliability.
Solution Approach 2:
The connection posts are designed to facilitate self-service repair by providing accessible, standardized connection points that can be easily engaged and disengaged. The mechanical connection system allows technicians to simply connect or disconnect devices from the substrate without requiring complex rework or specialized equipment.
Data Source
AI summary
A repairable matrix-addressed system includes a system substrate, an array of electrically conductive row lines, and an array of electrically conductive column lines disposed over the system substrate. The row lines extend over the system substrate in a row direction and the column lines extend over the system substrate in a column direction different from the row direction to define an array of non-electrically conductive intersections between the row lines and the column lines. An array of electrically conductive line segments is disposed over the system substrate. The line segments extend over the system substrate substantially parallel to the row direction and have a line segment length that is less than the distance between adjacent column lines. Each line segment is electrically connected to a column line. One or more devices are electrically connected to each row line and to each line segment adjacent to the row line.