Optical system and head mount display

Abstract

The present disclosure provides an optical system and a head mount display, the optical system comprises: a first lens with a first surface and a second surface provided oppositely, the first lens comprising a light input-coupling end-face connected with the first surface and the second surface; a polarizing reflector disposed at a side of the first lens away from the light input-coupling end-face; a beam splitter disposed on a side where the second surface of the first lens is located; a second lens disposed between the beam splitter and the first lens; and a phase retarder disposed on the beam splitter or on the second lens, comprising a body and an extension, the body being disposed corresponding to a middle region of the beam splitter, the extension extending from the body toward an outer edge of the beam splitter, and an outer edge of the extension being aligned with the outer edge of the beam splitter.