Printable Diode Ink for Low-Cost LED Manufacturing
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Solution Overview
Problem
Current methods for manufacturing light emitting diodes (LEDs) and photovoltaic devices are costly and labor-intensive, involving complex processes that make them unsuitable for widespread consumer use, as they require semiconductor wafers and intricate assembly processes.
Innovation Solution
A liquid or gel suspension of fully formed, functioning diodes or two-terminal integrated circuits is developed, allowing for printing-based manufacturing using a diode ink composed of diodes, solvents, and viscosity modifiers, enabling the creation of LED-based devices and photovoltaic panels with reduced costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional semiconductor wafer processes are used to manufacture LEDs and photovoltaic devices, then manufacturing precision and device reliability are improved, but manufacturing cost and device complexity increase significantly
Solution Approach 1:
The patent uses printed circuits as simplified copies or representations of traditional semiconductor devices. Instead of manufacturing complex semiconductor wafers with precise crystal structures, the invention creates functional equivalents using printed conductive traces, resistors, capacitors, and other passive components that replicate the electrical behavior of semiconductor devices at lower cost and complexity
Solution Approach 2:
The patent employs inexpensive printed circuit components that can be mass-produced through printing processes rather than expensive semiconductor fabrication. These printed devices use readily available materials like conductive inks and standard passive components, making them economically viable for widespread consumer applications where extreme longevity is not critical
2Reliability
If traditional semiconductor wafer processes are used to manufacture LEDs and photovoltaic devices, then device performance is improved, but manufacturing complexity and labor intensity increase
Solution Approach 1:
The patent replaces complex semiconductor manufacturing processes with printed circuit fabrication that copies the essential electrical functions using simpler, well-established printing technologies. The printed devices replicate semiconductor behavior through equivalent electrical circuits rather than requiring semiconductor-grade material processing
Solution Approach 2:
The patent substitutes mechanical and chemical semiconductor fabrication processes (wafer slicing, doping, metallization, bonding) with a printing-based system that deposits conductive and functional materials directly onto substrates. This eliminates the need for cleanrooms, complex photolithography, and multiple sequential manufacturing steps
3Ease of manufacture
If printed circuit composition is used to manufacture LED-based devices and photovoltaic panels, then manufacturing cost and complexity are reduced, but manufacturing precision may be compromised
Solution Approach 1:
The patent adjusts printing parameters such as ink viscosity, deposition speed, layer thickness, and curing conditions to achieve consistent trace widths, resistance values, and component geometries. By optimizing these process parameters, the printed devices achieve sufficient precision for their intended applications without requiring semiconductor-level tolerances
Solution Approach 2:
The patent applies different ink formulations, deposition methods, and post-processing techniques to specific regions of the printed circuit to achieve appropriate precision levels where needed. Critical areas receive enhanced control and validation, while non-critical areas use standard printing processes, optimizing the balance between precision and cost
Data Source
AI summary
An exemplary printable composition of a liquid or gel suspension of two-terminal integrated circuits comprises: a plurality of two-terminal integrated circuits, each two-terminal integrated circuit of the plurality of two-terminal integrated circuits less than about 75 microns in any dimension; a first solvent; a second solvent different from the first solvent; and a viscosity modifier; wherein the composition has a viscosity substantially about 50 cps to about 25,000 cps at about 25° C.