Hybrid pixel detectors - a sandwich of a pixel sensor and a chip -
have played a very important role in the LHC experiments during the first three years of running.
They constitute the current "state of the art" of pixel detectors. Encouraged by this success new developments including much less massive, more monolithic approaches have been developed. Experiments at RHIC (US) and SuperKEKB (Japan) will soon have new types of pixel detectors as their innermost layers. For the HL-LHC, however, new concept ideas
are necessary to cope with the high level of radiation and data bandwidth. New hybrid sensor materials, like 3D-Si and diamond
have been developed and are already in production within the current ATLAS upgrades.
Also fully monolithic approaches as well as 3D integration are now realistically addressed and first successes have recently been obtained.
The talk will give an overview over the physics of pixel detectors, their successes and development routes, as well as possible directions for HL-LHC.