Optical system, display apparatus, and smart glasses

An optical system, comprising:

• a transflective element and a reflective element that are disposed opposite to each other, extension lines of the transflective element and the reflective element intersecting;
• wherein a light incident surface of the transflective element is disposed proximate to the reflective element, and a light exit surface thereof is disposed away from the reflective element;
• the transflective element is configured to reflect collimated incident light to the reflective element;
• the reflective element is configured to reflect the collimated incident light back to the light incident surface of the transflective element, so as to adjust an angle at which the collimated incident light exits;
• and the transflective element is further configured to transmit the collimated incident light reflected back by the reflective element to a target region;
• and
• a plurality of microstructures disposed on the light exit surface of the transflective element;
• the plurality of microstructures being configured to adjust angles at which ambient stray light incident on surfaces thereof exits, and to scatter the ambient stray light out of the target region, wherein the plurality of microstructures include a plurality of prisms arranged in parallel;
• a prism in the plurality of prisms is a triangular prism;
• a cross section of the triangular prism perpendicular to refracting surfaces thereof has a shape of a non-isosceles triangle;
• and the non-isosceles triangle has an apex angle away from the light exit surface of the transflective element, and a first base angle and a second base angle that are proximate to the light exit surface of the transflective element, wherein
• a value of the apex angle is in a range of 85° to 105°, inclusive;
• a value of the first base angle is in a range of 15° to 25°, inclusive;
• and
• a value of the second base angle is in a range of 60° to 70°, inclusive, and
• along an exit direction of the collimated incident light, the first base angle is located at a side of the second base angle away from the reflective element.