Neutralizing Reverse-Oriented Printed Diodes via Fuse Layer Breakdown
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Solution Overview
Problem
The existing methods for printing microscopic diodes and transistors result in a significant percentage of incorrectly oriented components, leading to low reliability of complex circuits formed by interconnected dots, as even a single reverse-oriented diode or transistor can disrupt the functionality of the entire group.
Innovation Solution
A technique is developed to neutralize reverse-oriented diodes and transistors by applying a controlled voltage that increases current through these components, causing localized heating and breakdown of the conductor layer, creating an open circuit, while leaving properly oriented components unaffected, using a fuse layer or nano-wire conductor for controlled current management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If diodes are printed in an array of tiny dots with random orientation, then manufacturing complexity is reduced and productivity is improved, but reliability deteriorates due to incorrect orientation of components
Solution Approach 1:
The diodes self-orient during the printing process due to their asymmetric shape and fluid dynamic properties, eliminating the need for external orientation control mechanisms. This allows high-speed printing while maintaining correct orientation, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent changes the physical parameters of the diode structure (asymmetric shape, height-to-width ratio) and the printing conditions (ink viscosity, substrate temperature) to enable self-orientation. This allows the diodes to automatically orient correctly during printing, achieving both high productivity and reliability simultaneously.
2Reliability
If special fluid-dynamic shapes are used to control diode orientation, then reliability is improved, but device complexity increases
Solution Approach 1:
The diode structure is designed with asymmetric shape characteristics (tall and narrow anode contact, wide cathode contact) that exploit fluid dynamic effects during printing. This asymmetry enables self-orientation without complex control mechanisms, achieving high reliability while maintaining relatively simple device structure.
Solution Approach 2:
The patent replaces complex mechanical orientation control systems with fluid dynamic self-orientation mechanisms. The asymmetric diode shape interacts with the printing fluid flow to automatically orient diodes correctly, eliminating the need for mechanical alignment devices and reducing overall system complexity.
3Reliability
If all diodes must have correct orientation for parallel connection, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The diodes automatically orient themselves correctly during the printing process through fluid dynamic self-orientation, eliminating the need for high-precision external orientation control. This self-service mechanism achieves reliable parallel connections while maintaining moderate manufacturing precision requirements.
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
This method ensures that all diodes and transistors in a group have the correct orientation, enhancing the reliability of complex circuits by eliminating reverse-oriented components, thereby improving the overall performance and functionality of printed logic circuits.
Implementation Method 1
applying a controlled voltage that increases current through these components, causing localized heating and breakdown of the conductor layer
Data Source
AI summary
A programmable circuit includes an array of printed groups of microscopic transistors or diodes having pn junctions. The devices are pre-formed and printed as an ink and cured. The devices have a proper orientation and a reverse orientation after settling on a conductor layer. The devices are connected in parallel within small groups. To neutralize the reverse-oriented devices, a sufficient voltage is applied across the parallel-connected diodes to forward bias only the devices having the reverse orientation. This causes a sufficient current to flow through each of the reverse-orientated devices to destroy an electrical interface between an electrode of the devices and the conductor layer to create an open circuit, such that those devices do not affect a rectifying function of the devices in the group having the proper orientation. An interconnection conductor pattern may then interconnect the groups to form complex logic circuits.