  This is part of a document, which is devoted to the developments of pixel
detectors in the context of the International Linear Collider. From the early
developments of the MIMOSAs to the proposed DotPix I recall some of the major
progresses. The need for very precise vertex reconstruction is the reason for
the Research and Development of new pixel detectors, first derived from the
CMOS sensors and in further steps with new semiconductors structures. The
problem of radiation effects was investigated and this is the case for the
noise level with emphasis of the benefits of downscaling. Specific
semiconductor processing and characterisation techniques are also described,
with the perspective of a new pixel structure.
