Optically-masked microelectronic packages and methods for the fabrication thereof
First Claim
1. A method for fabricating an optically-masked microelectronic package, comprising:
- building redistribution layers over the frontside of a semiconductor die, the redistribution layers comprising a body of dielectric material in which a plurality of interconnect lines are formed;
forming an optical mask layer overlying the frontside of the semiconductor die and at least a portion of the redistribution layers, the optical mask layer having an opacity greater than the opacity of the body of dielectric material and blocking or obscuring visual observation of an interior portion of the microelectronic package through the redistribution layers; and
producing a contact array before or after formation of the optical mask layer electrically coupled to the plurality of interconnect lines, at least some of the contacts included within the contact array projecting through openings in the optical mask layer, the openings sized such that a circumferential clearance having a predetermined gap width is formed around each contact projecting through the optical mask layer.
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Accused Products
Abstract
Microelectronic packages and methods for fabricating microelectronic packages having optical mask layers are provided. In one embodiment, the method includes building redistribution layers over the frontside of a semiconductor die. The redistribution layers includes a body of dielectric material in which a plurality of interconnect lines are formed. An optical mask layer is formed over the frontside of the semiconductor die and at least a portion of the redistribution layers. The optical mask layer has an opacity greater than the opacity of the body of dielectric material and blocks or obscures visual observation of an interior portion of the microelectronic package through the redistribution layers.
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Citations
20 Claims
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1. A method for fabricating an optically-masked microelectronic package, comprising:
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building redistribution layers over the frontside of a semiconductor die, the redistribution layers comprising a body of dielectric material in which a plurality of interconnect lines are formed; forming an optical mask layer overlying the frontside of the semiconductor die and at least a portion of the redistribution layers, the optical mask layer having an opacity greater than the opacity of the body of dielectric material and blocking or obscuring visual observation of an interior portion of the microelectronic package through the redistribution layers; and producing a contact array before or after formation of the optical mask layer electrically coupled to the plurality of interconnect lines, at least some of the contacts included within the contact array projecting through openings in the optical mask layer, the openings sized such that a circumferential clearance having a predetermined gap width is formed around each contact projecting through the optical mask layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for fabricating an optically-masked microelectronic package, comprising:
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building redistribution layers over the frontside of a semiconductor die, the redistribution layers comprising a body of dielectric material, an outer solder mask layer included in the body of dielectric material, and a plurality of interconnect lines formed in the body of dielectric material; creating openings in the outer solder mask layer exposing selected regions of the interconnect lines; and forming an optical mask layer over the redistribution layers after creating the openings in the outer solder mask layer, the optical mask layer having an opacity greater than the opacity of the body of dielectric material and blocking or obscuring visual observation of an interior portion of the microelectronic package through the redistribution layers; wherein forming the optical mask layer comprising; forming sacrificial plugs in the openings created in the outer solder mask layer; dispensing a layer of optical mask material over the outer solder mask layer and in contact with the sacrificial plugs; and removing the sacrificial plugs to yield the optical mask layer. - View Dependent Claims (16)
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17. A method for fabricating an optically-masked microelectronic package, comprising:
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producing redistribution layers over the frontside of a semiconductor die, the redistribution layers comprising a body of dielectric material in which interconnect lines are formed; and applying an optical mask layer over the redistribution layers, the optical mask layer having an opacity greater than the opacity of the body of dielectric material and blocking or obscuring visual observation of an interior portion of the microelectronic package through the redistribution layers, the optical mask layer applied in a solid state as a thin film sheet bonded to an outer surface of the redistribution layers. - View Dependent Claims (18, 19, 20)
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Specification