Augmented reality optical module

An augmented reality optical module, for superimposing light emitted by an image source on ambient light to form an augmented reality image, the augmented reality optical module comprising:

• a first lens;
• a second lens;
• a third lens group;
• a first polarization modulation unit provided on a side of the third lens group and configured to modulate the light emitted by the image source into first circularly polarized light;
• an angle selection film provided on a first surface of one side of the first lens, the angle selection film being configured to reflect light having an incidence angle greater than or equal to a first angle and transmit light having an incidence angle smaller than or equal to a second angle;
• and
• a second polarization modulation unit provided on the other side of the first lens and configured to modulate incident circularly polarized light into linearly polarized light,
• wherein the first lens and the second lens have a transflective effect on visible light,
• wherein the light emitted by the image source is transmitted along such a transmission path that the light emitted by the image source is transmitted through the third lens group and the first polarization modulation unit to form the first circularly polarized light, the first circularly polarized light is incident on the angle selection film at a first incidence angle and reflected by the angle selection film, the reflected light is incident on a first surface of the second lens and reflected by the second lens, and then is incident on the angle selection film at a second incidence angle and transmitted through the angle selection film, the first lens, and the second polarization modulation unit, sequentially, to form imaging light,
• wherein the ambient light is transmitted along such a transmission path that the ambient light is transmitted through the second lens, the transmitted light is incident on the angle selection film at a third incidence angle and transmitted through the angle selection film, the first lens, and the second polarization modulation unit, sequentially, and then superimposed on the imaging light, and
• wherein the first incidence angle is greater than or equal to the first angle, and the second incidence angle and the third incidence angle are both smaller than or equal to the second angle.