Optical system and near-eye display device

An optical system, comprising:

• an optical waveguide;
• and
• an eyepiece system at a light incident side of the optical waveguide, a light exit side of the eyepiece system being opposite to the light incident side of the optical waveguide so that light exited from the eyepiece system is incident on the optical waveguide,
• wherein the eyepiece system comprises a lens group, the lens group comprises a first lens, a second lens, and a third lens which are sequentially arranged along a direction parallel to an optical axis of the lens group, a side of the first lens away from the second lens is the light exit side of the eyepiece system, each of the first lens and the third lens has a positive focal power, and the second lens has a negative focal power,
• a focal power of the first lens is in a range from 0.01 to 0.2, a focal power of the second lens is in a range from −0.01 to −0.2, and a focal power of the third lens is in a range from 0.05 to 0.3.

An optical system, comprising:

• an optical waveguide;
• and
• an eyepiece system at a light incident side of the optical waveguide, a light exit side of the eyepiece system being opposite to the light incident side of the optical waveguide so that light exited from the eyepiece system is incident on the optical waveguide,
• wherein the eyepiece system comprises a lens group, the lens group comprises a first lens, a second lens, and a third lens which are sequentially arranged along a direction parallel to an optical axis of the lens group, a side of the first lens away from the second lens is the light exit side of the eyepiece system, each of the first lens and the third lens has a positive focal power, and the second lens has a negative focal power;
• an orthographic projection of the lens group on a plane perpendicular to the optical axis has a maximum size in a first direction;
• in the first direction, a diameter of each lens is in a range from 10 mm to 35 mm;
• and in a second direction perpendicular to the first direction, a diameter of each lens is in a range from 5 mm to 15 mm, and both the first direction and the second direction are perpendicular to the optical axis.