Micromechanical device having a structure tiltable by a quasi-static piezoelectric actuation and having stiffening elements

A pico-projector for use in a portable electronic apparatus, comprising:

• a light source actuatable to generate a light beam as a function of an image to be generated;
• a micromechanical device comprising;
• a fixed structure;
• a mobile portion rotatable about a first rotation axis;
• a first actuation structure, coupling the fixed structure to the mobile portion to enable rotation of the mobile portion about the first rotation axis,
• wherein the mobile portion comprises:
• a supporting structure;
• a tiltable platform rotatable about a second rotation axis transverse to the first rotation axis;
• and
• a second actuation structure coupled between the tiltable platform and the supporting structure;
• and
• stiffening elements coupled between the supporting structure and the fixed structure;
• and
• a driving circuit configured to supply signals driving rotation of the mobile portion.