Chip

1. A chip comprising:

a chip body; and

a metal layer formed on said chip body, and including a metal interconnect region electrically connected to said chip body, a light trapping region, and a light reflective region that adjoins said light trapping region and that is able to reflect light, said light trapping region being formed with a plurality of gaps and having a plurality of metal members, adjacent ones of said metal members being separated by said gaps, each of said gaps being configured with a width in such a manner that most light irradiating said light trapping region will pass through said gaps and be trapped in said chip body so as to form brightness contrast between said light trapping region and said light reflective region.

2. The chip of claim 1 , wherein the width of each of said gaps ranges from 0.1 μm to 100 μm.

3. The chip of claim 1 , wherein said light trapping region is surrounded by said light reflective region.

4. The chip of claim 1 , further comprising a plurality of spaced apart metal pillars, each of which is connected between a respective one of said metal members and said chip body.

5. The chip of claim 1 , wherein each of said metal members has an indented upper surface opposite to said chip body.

6. The chip of claim 1 , wherein each of said metal members has an upper surface that is in a rectangle shape and that is disposed opposite to said chip body, each side of an outer periphery of each of said metal members having a length not greater than 100 μm.

7. The chip of claim 6 , wherein each of said metal members has a through hole, and an inner periphery that defines said through hole, a distance between a center of said through hole and said inner periphery ranging from 0.05 μm to 25 μm.

8. The chip of claim 7 , wherein a distance between said outer and inner peripheries of each of said metal members is not greater than 50 μm.