Looking at a larger image, you can see three different detector types, distinguished here by their patterns of contacts. One is for the CMS upgrade, another is for a lepton collider, and the third is for X-ray correlation spectroscopy.

Each of the integrated circuits you see here is about 6 millimeters on a side and projects one one-thousandth of an inch above the surface of the larger sensor wafer on which it sits, together forming a functional detector.