Integrated circuit package system with planar interconnects

1. An integrated circuit packaging method comprising:

forming a first substrate having second interconnect structures on a bottom surface including the second interconnect structures evenly spaced across the bottom surface;

mounting a first integrated circuit directly above the second interconnect structures and completely above the first substrate opposite the second interconnect structures;

molding a first encapsulant layer encasing the first integrated circuit and the first substrate; and

forming first planar interconnects, on the first encapsulant layer with only a bottom surface of the first planar interconnects in contact with the first encapsulant layer, for depositing an electrical connection between the first integrated circuit and the second interconnect structures of the first substrate.

2. The method as claimed in claim 1 further comprising forming a first polished surface on the first encapsulant layer exposing first solder bumps on the first integrated circuit and first interconnect structures on the first substrate.

3. The method as claimed in claim 1 wherein the forming of the first planar interconnects further comprises forming a conductive material deposition using a mask process, a photolithography process, or a stencil printing process.

4. The method as claimed in claim 1 wherein forming the first planar interconnects further comprises forming first interconnect structures, wherein each of the first interconnect structures comprises forming a conductive post, a conductive ball, a conductive stud bump or a conductive interposer.

5. The method as claimed in claim 1 further comprising forming a second encapsulant layer encasing the first encapsulant layer and the first planar interconnects.

6. An integrated circuit package method comprising:

forming a first substrate having second interconnect structures on a bottom surface and first interconnect structures connected on the side opposite the second interconnect structures including the second interconnect structures evenly spaced across the bottom surface;

providing a first integrated circuit;

mounting the first integrated circuit directly above the second interconnect structures and completely above the first substrate, with first interconnect structures thereon, further comprising forming a first encapsulant layer to encase the first integrated circuit, the first interconnect structures, and a top surface of the first substrate;

forming first planar interconnects on the first encapsulant layer with only a bottom surface of the first planar interconnects in contact with the first encapsulant layer for depositing an electrical connection at one set of horizontal ends over a top of the first integrated circuit and for electrical connection at the other set of horizontal ends to the first interconnect structures; and

forming a second encapsulant layer to encase the first encapsulant layer and the first planar interconnects.

7. The method as claimed in claim 6 wherein the forming of the first planar interconnects further comprises forming a conductive material deposition using a mask process, a photolithography process or a stencil printing process in electrical contact with the first interconnect structures.

8. The method as claimed in claim 6 wherein:

forming the first substrate having first interconnect structures connected thereon further comprises forming a conductive post, a conductive ball, a conductive stud bump or a conductive interposer; and

forming the first planar interconnects forms the first planar interconnects electrically in contact with the first interconnect structures.

9. An integrated circuit package system comprising:

a first substrate with second interconnect structures on a bottom surface including the second interconnect structures evenly spaced to cover the bottom surface;

a first integrated circuit mounted directly above the second interconnect structures and completely above the first substrate opposite the second interconnect structures;

a first encapsulant layer encasing the first integrated circuit and the first substrate; and

first planar interconnects formed on the first encapsulant layer with only a bottom surface of the first planar interconnects in contact with the first encapsulant layer, wherein the first planar interconnects electrically connect the first integrated circuit and the second interconnect structures of the first substrate.

10. The system as claimed in claim 9 further comprising:

a second integrated circuit mounted over the first integrated circuit;

and wherein:

the second integrated circuit is electrically connected to the first substrate.

11. The system as claimed in claim 10 wherein the second integrated circuit is electrically connected to the first substrate by first bond wires.

12. The system as claimed in claim 10 wherein the second integrated circuit is electrically connected to the first substrate by second solder bumps.

13. The system as claimed in claim 10 further comprising:

a second substrate having the second integrated circuit thereon; and

second planar interconnects electrically connecting the second integrated circuit to the second substrate and electrically connecting the second substrate to the first substrate.

14. The system as claimed in claim 9 wherein the first planar interconnects are mounted, flush, between the first integrated circuit and a top surface of first interconnect structures.

15. An integrated circuit package system comprising:

a first substrate having second interconnect structures on a bottom surface and first interconnect structures on the opposite side includes the second interconnect structures spaced evenly across the bottom surface;

a first integrated circuit wherein the first integrated circuit is mounted directly above the second interconnect structures and completely above the first substrate with the first interconnect structures;

a first encapsulant layer encases the first integrated circuit, the first interconnect structures and a top surface of the first substrate;

first planar interconnect, deposited on the first encapsulant layer with only a bottom surface of the first planar interconnects in contact with the first encapsulant layer, electrically connected at one set of horizontal ends deposited over a top of the first integrated circuit and at the other set of horizontal ends to the first substrate; and

a second encapsulant layer encasing the first encapsulant layer and the first planar interconnects.

16. The system as claimed in claim 15 wherein each of the first interconnect structures comprises a conductive post, a conductive ball, a conductive stud bump or a conductive interposer.

17. The system as claimed in claim 15 further comprising:

a second integrated circuit mounted over the first integrated circuit; and

first wire bonds electrically connecting the second integrated circuit to the first substrate.

18. The system as claimed in claim 15 further comprising:

a second integrated circuit mounted over the first integrated circuit; and

second solder bumps electrically connecting the second integrated circuit to the first substrate.

19. The system as claimed in claim 15 further comprising:

a second substrate having a second integrated circuit thereon and mounted on the first substrate; and

second planar interconnects electrically connecting the second integrated circuit to the second substrate.

20. The system as claimed in claim 15 further comprising:

a second substrate having a second integrated circuit flush thereon;

second planar interconnects electrically connecting the second integrated circuit to the second substrate and electrically connecting the first substrate to the second substrate.