Fan-out package with controllable standoff

1. A structure comprising:

an interconnect structure comprising bond pads;

a package component over and bonded to the interconnect structure;

an interposer bonded to the interconnect structure, the interposer comprising:

a metal feature overlapping the package component;

a rigid dielectric layer encapsulating the metal feature therein;

redistribution lines over the rigid dielectric layer; and

electrical conductive features underlying the redistribution lines, wherein the electrical conductive features electrically couple the redistribution lines to the bond pads of the interconnect structure, and wherein the electrical conductive features comprise metal pillars;

an encapsulant contacting sidewalls of the rigid dielectric layer, wherein a portion of the encapsulant overlaps the package component; and

solder regions joining the metal pillars to respective one of the bond pads of the interconnect structure.

2. The structure of claim 1 , wherein the interposer further comprises:

a dielectric substrate over the rigid dielectric layer and under the redistribution lines; and

a metal plate over and contacting the metal feature and the rigid dielectric layer, wherein the metal plate is in the dielectric substrate, and has a bottom surface substantially coplanar with a bottom surface of the dielectric substrate.

3. The structure of claim 2 , wherein the interposer further comprises through-vias in the dielectric substrate, wherein the through-vias electrically couple the redistribution lines to the electrical conductive features.

4. The structure of claim 1 , wherein the package component comprises a device die comprising a semiconductor substrate, and wherein the metal feature and the rigid dielectric layer are in physical contact with a top surface of the semiconductor substrate.

5. The structure of claim 1 , wherein the metal feature is signally decoupled from integrated circuit devices in the package component.

6. The structure of claim 1 , wherein the rigid dielectric layer comprises an edge laterally recessed from a respective edge of the package component, and the edge of the rigid dielectric layer is in physical contact with the encapsulant.

7. The structure of claim 1 wherein bottom surfaces of the metal pillars extend below a first top surface of the package component.

8. The structure of claim 7 , wherein top surfaces of the metal pillars are coplanar with a second top surface of the rigid dielectric layer.

9. The structure of claim 1 , wherein one of the solder regions comprises:

a top end in physical contact with one of the metal pillars; and

a bottom end in physical contact with one of the bond pads of the interconnect structure.

10. A structure comprising:

a first interconnect structure;

a device die over and bonded to the first interconnect structure, wherein the device die comprises a semiconductor substrate;

an encapsulant over the first interconnect structure, wherein the device die is encapsulated in the encapsulant;

a second interconnect structure comprising:

a dielectric layer over and contacting the encapsulant; and

a conductive feature penetrating through the dielectric layer; and

a metal feature between, and in contact with both of, the device die and the second interconnect structure, wherein the metal feature is in the encapsulant, wherein the metal feature is in contact with the semiconductor substrate of the device die.

11. The structure of claim 10 further comprising a rigid dielectric layer over and contacting the device die, wherein the rigid dielectric layer comprises a first portion encircling the metal feature, and second portions penetrating through the metal feature, and wherein the rigid dielectric layer comprises an edge laterally recessed from a respective edge of the device die, and the edge of the rigid dielectric layer is in physical contact with the encapsulant.

12. The structure of claim 11 further comprising an additional metal plate in the dielectric layer of the second interconnect structure, wherein the additional metal plate contacts the metal feature.

13. The structure of claim 12 , wherein the additional metal plate further contacts the second portions of the rigid dielectric layer.

14. The structure of claim 11 , wherein the device die extends laterally beyond edges of the rigid dielectric layer.

15. The structure of claim 10 , wherein the metal feature is signally decoupled from integrated circuit devices in the device die.

16. A structure comprising:

a first interconnect structure;

a device die over and bonded to the first interconnect structure;

an encapsulant over the first interconnect structure, wherein the device die is encapsulated in the encapsulant;

a second interconnect structure comprising:

a dielectric layer over and contacting the encapsulant; and

a dielectric feature between, and in physical contact with both of, the device die and the second interconnect structure, wherein first opposing edges of the dielectric feature are laterally recessed from corresponding second opposing edges of the device die, and wherein the first opposing edges of the dielectric feature are in physical contact with third edges of the encapsulant.

17. The structure of claim 16 further comprising a metal spacer in the dielectric feature, wherein the metal spacer comprises a plurality of portions separated from each other by portions of the dielectric feature.

18. The structure of claim 17 further comprising a metal pad in the second interconnect structure, wherein the metal pad is over and physically contacts the plurality of portions of the metal spacer.

19. The structure of claim 17 , wherein the metal spacer is electrically floating.

20. The structure of claim 16 further comprising a plurality of metal pillars electrically coupling the first interconnect structure to the second interconnect structure, wherein the plurality of metal pillars extend from a first level to a second level, wherein the first level is higher than a top surface of the device die, and the second level is lower than the top surface of the device die.