Method and apparatus for creating RFID devices
First Claim
1. A method for transferring a plurality of semiconductor dies from a first substrate, the method comprising:
- filling an interstitial space between the plurality of dies arranged on the first substrate in an array having a first dimension with a solidifiable substance;
solidifying the substance such that a respective position of each of the dies in the array is fixed;
removing the first substrate from the plurality of dies;
removing the solidified substance from between the plurality of dies such that the plurality of dies remain arrayed at the first dimension;
providing, where each die in the array of dies includes at least one contact and each die in the array of dies is set off from another die by a first pitch as measured between the respective contacts of each die, a plurality of electrical components arranged in an array on a second substrate, the plurality of electrical components having attachment locations disposed at the first pitch;
registering the second substrate with the array of dies such that respective attachment locations of the plurality of electrical components are matched with the respective at least one contact of the dies; and
,electrically coupling respective ones of the plurality of electrical components to respective, corresponding ones of the dies in the array of dies.
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Abstract
A process is disclosed for creating semiconductor devices such as RFID assemblies wherein an array of dies mounted to a substrate is spaced apart at a first pitch, and the substrate is removed after the positions of the dies in the array is fixed by a solidifiable substance. The solidifiable substance is then removed without changing the relative positions of the dies in the array. All or a selected portion of the array of dies is then electrically attached to a plurality of straps or interposers arranged in a corresponding array. The spacing, or pitch, between the dies in the die array may be changed before or after the substrate is removed to match the pitch of the straps or interposers in the corresponding array. An RFID device created using the process inventive is also disclosed.
42 Citations
15 Claims
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1. A method for transferring a plurality of semiconductor dies from a first substrate, the method comprising:
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filling an interstitial space between the plurality of dies arranged on the first substrate in an array having a first dimension with a solidifiable substance; solidifying the substance such that a respective position of each of the dies in the array is fixed; removing the first substrate from the plurality of dies; removing the solidified substance from between the plurality of dies such that the plurality of dies remain arrayed at the first dimension; providing, where each die in the array of dies includes at least one contact and each die in the array of dies is set off from another die by a first pitch as measured between the respective contacts of each die, a plurality of electrical components arranged in an array on a second substrate, the plurality of electrical components having attachment locations disposed at the first pitch; registering the second substrate with the array of dies such that respective attachment locations of the plurality of electrical components are matched with the respective at least one contact of the dies; and
,electrically coupling respective ones of the plurality of electrical components to respective, corresponding ones of the dies in the array of dies. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for creating an arrangement of integrated circuits comprising:
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providing a wafer with an array of dies, each containing an integrated circuit, disposed on a substrate, the array of dies having a first dimensional size; stretching the substrate so that the array of dies reaches a second dimensional size; fixing the array of dies at the second dimensional size with a solid material before removal of the substrate; and removing the solid material by a gasification process, wherein the array of dies remains at the second dimensional size after the removal of the solid material. - View Dependent Claims (9, 10, 11)
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12. A method for making an RFID assembly comprising:
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providing a wafer comprising an array of dies, the array of dies having a length and a width; attaching a substrate to the array of dies; stretching the substrate such that at least one of the length and width of the array of dies is increased from a first dimension to a selected second dimension and each die in the array is spaced apart from adjacent ones of the dies by a selected pitch; fixing the array of dies at the second selected dimension and die pitch; introducing a liquid into the separation between each die; solidifying the liquid into a solid; removing the substrate; and converting the solid into a gas. - View Dependent Claims (13, 14, 15)
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Specification