Optical imaging system and device for floating display, and surround-view display device

An optical imaging system for floating display, the optical imaging system sequentially defining an object plane, a first image plane, and a second image plane along an optical axis thereof, the optical imaging system comprising:

• at least one imaging unit comprising a main imaging unit, the main imaging unit being located downstream of the object plane and configured to converge a light beam from a point on the object plane on the first image plane to form a line image in the first direction, and the first image plane being located downstream of the main imaging unit;
• and
• a main diffusor located downstream of the main imaging unit and configured to diverge light in a second direction that is different from the first direction,
• wherein the second image plane is located downstream of the main diffusor and the first image plane, the at least one imaging unit is configured to converge a light beam from a point on the object plane on the second image plane to form a line image in the second direction, wherein the second image plane is a floating image plane,
• wherein said main imaging unit, said first image plane and the second image plane are located at different axial positions along the optical axis, and
• wherein the main imaging unit has different light-converging capabilities in the first direction and the second direction.