Substrate assembly including a compartmental dam for use in the manufacturing of an enclosed electrical circuit using an encapsulant
First Claim
1. An electrical assembly comprising:
- a substrate;
a plurality of electrical circuits on the substrate, each circuit comprising a semiconductor die, a battery in electrical communication with the die, and an antenna in electrical communication with the die;
a dam on the substrate comprising a plurality of cavities enclosing and separating the electrical circuits; and
an encapsulant in the cavities, at least partially covering the circuits and comprising a cured material formulated to allow the substrate with the electrical circuits thereon to flex.
3 Assignments
0 Petitions
Accused Products
Abstract
An enclosed electrical circuit and method for manufacturing the electrical circuit are provided. Initially a flexible substrate is formed with a plurality of electrical circuits. By way of example, each circuit can contain a conductive trace, a battery and a die, all in electrical communication. During the manufacturing process, a barrier is placed on the substrate and a curable encapsulant is poured into a cavity formed by the barrier and the substrate to encapsulate each circuit. The barrier can be formed as a compartmentalized dam having a separate cavity for each circuit, as a perimeter dam having a single cavity, or as a spacer sheet having a separate cavity for each circuit formed by a pattern of cut outs. Following the encapsulation step, the electrical circuits can be singulated into separate encapsulated circuits.
289 Citations
11 Claims
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1. An electrical assembly comprising:
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a substrate; a plurality of electrical circuits on the substrate, each circuit comprising a semiconductor die, a battery in electrical communication with the die, and an antenna in electrical communication with the die; a dam on the substrate comprising a plurality of cavities enclosing and separating the electrical circuits; and an encapsulant in the cavities, at least partially covering the circuits and comprising a cured material formulated to allow the substrate with the electrical circuits thereon to flex. - View Dependent Claims (2, 3, 4)
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5. An electrical assembly comprising:
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a substrate comprising a material selected from the group consisting of polyester and PET, having a thickness of from 0.9 mil to 10 mils; a plurality of electrical circuits on the substrate, each circuit comprising a semiconductor die for storing information, an antenna in electrical communication with the die for sending and receiving the information as rf signals, and a battery in electrical communication with the die; a dam on the substrate comprising a plurality of cavities enclosing and separating the electrical circuits; and an encapsulant in the cavities at least partially encapsulating the circuits, the encapsulant comprising epoxy formulated to allow the substrate with the circuits thereon to flex. - View Dependent Claims (6, 7)
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8. An electrical assembly comprising:
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a substrate comprising a material selected from the group consisting of polyester and PET, having a surface and a thickness of from 0.9 mil to 10 mils; a plurality of separate electrical circuits on the surface of the substrate, each circuit comprising a semiconductor die for storing information, an antenna in electrical communication with the die for sending and receiving the information as rf signals, and a battery in electrical communication with the die; a compartmental dam on the substrate comprising a plurality of separate cavities, each cavity at least partially enclosing and separating an electrical circuit; and a cured material formed in each cavity encapsulating the electrical circuits, the cured material formulated to allow the substrate with the electrical circuits thereon to flex. - View Dependent Claims (9, 10, 11)
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Specification