Semiconductor package structure

1. A semiconductor package structure, comprising:

a substrate having a first surface and a second surface opposite thereto, wherein the substrate comprises a wiring structure;

a first semiconductor die disposed over the first surface of the substrate and electrically coupled to the wiring structure;

a second semiconductor die disposed over the first surface of the substrate and electrically coupled to the wiring structure, wherein the first semiconductor die and the second semiconductor die are separated by a molding material;

a first hole and a second hole formed on the second surface of the substrate; and

a frame disposed over the first surface of the substrate, wherein the frame surrounds the first semiconductor die and the second semiconductor die.

2. The semiconductor package structure as claimed in claim 1 , wherein the first hole is covered by the first semiconductor die, and the second hole is covered by the second semiconductor die.

3. The semiconductor package structure as claimed in claim 1 , wherein the first hole and the second hole are disposed closer to a center line between the first semiconductor die and the second semiconductor die than an edge of the substrate.

4. The semiconductor package structure as claimed in claim 1 , wherein the first hole and the second hole have rectangular shapes or circular shapes from a plane view.

5. The semiconductor package structure as claimed in claim 1 , further comprising:

a third hole and a fourth hole formed on the second surface of the substrate, wherein the third hole is covered by the first semiconductor die, and the fourth hole is covered by the second semiconductor die, and

wherein the first hole, the second hole, the third hole and the fourth hole are arranged radially around a center of the substrate.

6. The semiconductor package structure as claimed in claim 1 , further comprising:

a third hole and a fourth hole formed on the second surface of the substrate, wherein the third hole is covered by the first semiconductor die, and the fourth hole is covered by the second semiconductor die, and

wherein the first hole and the third hole are arranged in a first array, and the second hole and the fourth hole are arranged in a second array, the first array and the second array are parallel to a center line between the first semiconductor die and the second semiconductor die.

7. The semiconductor package structure as claimed in claim 6 , further comprising:

a fifth hole and a sixth hole formed on the second surface of the substrate, wherein the fifth hole is covered by the first semiconductor die, and the sixth hole is covered by the second semiconductor die, and

wherein the first hole, the third hole and the fifth hole are staggered along a direction of the center line, and the second hole, the fourth hole and the sixth hole are staggered along the direction of the center line.

8. The semiconductor package structure as claimed in claim 1 , further comprising:

a plurality of conductive structures disposed over the first surface and below the first semiconductor die and the second semiconductor die; and

a plurality of bump structures disposed over the second surface of the substrate, wherein the first semiconductor die and the second semiconductor die are electrically coupled to the bump structures through the conductive structures and the wiring structure in the substrate.

9. The semiconductor package structure as claimed in claim 1 , wherein the molding material further surrounds the first semiconductor die and the second semiconductor die, and surfaces of the first semiconductor die and the second semiconductor die facing away from the substrate are exposed by the molding material.

10. The semiconductor package structure as claimed in claim 1 , further comprising:

a stress buffer layer filled into the first hole and the second hole.