Integrated circuit packaging system with stacked integrated circuit and heat spreader with openings and method of manufacture thereof

1. A method of manufacture of an integrated circuit packaging system comprising:

providing a substrate;

attaching a first integrated circuit to the substrate by interconnects only along opposite sides of the first integrated circuit; attaching an interface layer over the first integrated circuit;

attaching a heat spreader to the substrate, the heat spreader extending over the first integrated circuit; and

wherein portions of the substrate and portions of the interface layer visible through openings of a regular pattern in the heat spreader and between the opposite sides of an first integrated circuit.

2. The method as claimed in claim 1 further comprising positioning the interface layer between a first integrated circuit and the heat spreader.

3. The method as claimed in claim 1 wherein attaching the heat spreader includes perforating a regular pattern of openings in the heat spreader for adjusting the coefficient of thermal expansion of the heat spreader for the coefficient of thermal expansion of the substrate.

4. The method as claimed in claim 1 wherein attaching the heat spreader includes providing vertical supports therefor in line with sides of the heat spreader.

5. The method as claimed in claim 1 further comprising attaching a further heat spreader over the heat spreader.

6. A method of manufacture of an integrated circuit packaging system comprising:

providing a substrate;

attaching a first integrated circuit to the substrate by interconnects only along opposite sides of the first integrated circuit;

attaching an interface layer over the first integrated circuit;

attaching a heat spreader to the substrate, the heat spreader extending over the first integrated circuit between the opposite sides of the first integrated circuit;

attaching a second integrated circuit over the heat spreader by interconnects only along opposite sides of the second integrated circuit; and

attaching an additional heat spreader to the heat spreader, the additional heat spreader identical to the heat spreader and extending over the second integrated circuit between the opposite sides of the second integrated circuit; and

wherein portions of the substrate and portions of the interface layer visible through openings of a regular pattern in the heat spreader.

7. The method as claimed in claim 6 further comprising:

positioning interface layers between the first integrated circuit and the heat spreader and between the second integrated circuit and the additional heat spreader; and

positioning a spacer between the heat spreader and the second integrated circuit.

8. The method as claimed in claim 6 wherein attaching the heat spreader includes perforating the regular pattern of openings in the heat spreader for adjusting the coefficient of thermal expansion of the heat spreader for the coefficients of thermal expansion of the substrate and the second integrated circuit.

9. The method as claimed in claim 6 further comprising providing an encapsulant, having a flat top or a recess in the top, around the first integrated circuit and the heat spreader.

10. The method as claimed in claim 6 further comprising attaching a further heat spreader over or on the additional heat spreader.

11. An integrated circuit packaging system comprising:

a substrate;

a first integrated circuit attached to the substrate by interconnects only along opposite sides of the first integrated circuit; an interface layer over the first integrated circuit;

a heat spreader attached to the substrate, the heat spreader extending over the first integrated circuit; and

wherein portions of the substrate and portions of the interface layer visible through openings of a regular pattern in the heat spreader and between the opposite sides of the first integrated circuit.

12. The system as claimed in claim 11 wherein the comprising an interface layer is between the first integrated circuit and the heat spreader.

13. The system as claimed in claim 11 further comprising a regular pattern of openings in the heat spreader has the coefficient of thermal expansion of the heat spreader matched to the coefficient of thermal expansion of the substrate by the regular pattern of openings.

14. The system as claimed in claim 11 further comprising vertical supports therefor in line with sides of the heat spreader.

15. The system as claimed in claim 11 further comprising a further heat spreader over the heat spreader.

16. The system as claimed in claim 11 further comprising:

a second integrated circuit over the heat spreader by interconnects only along opposite sides of the second integrated circuit; and

an additional heat spreader attached to the heat spreader, the additional heat spreader identical to the heat spreader and extending over the second integrated circuit between the opposite sides of the second integrated circuit.

17. The system as claimed in claim 16 further comprising:

interface layers between the first integrated circuit and the heat spreader and between the second integrated circuit and the additional heat spreader; and

a spacer between the heat spreader and the second integrated circuit.

18. The system as claimed in claim 16 further comprising a regular pattern of openings in additional the heat spreader with the coefficient of thermal expansion of the heat spreader matched to the coefficients of thermal expansion of the substrate and the second integrated circuit by the regular pattern of openings.

19. The system as claimed in claim 16 further comprising an encapsulant, having a flat top or a recess in the top, around the first integrated circuit and the heat spreader.

20. The system as claimed in claim 16 further comprising a further heat spreader over or on the additional heat spreader.