Embodiments discussed herein refer to generating multiple laser beams from a single beam source. Single source multi-beam splitters can produce multiple beams from a single source, precisely control the exit angle of each beam, and ensure that each beam has substantially the same intensity.

A virtual scene may be projected onto a two-dimensional screen of a head mounted display. The two-dimension screen may be substantially perpendicular to a visual axis of a user wearing the head mounted display. A lens assembly of the projector may be adjusted to focus on a viewing portion of the virtual scene on the screen.

An optical layered composite includes: a substrate having a front face, a back face, a thickness d.sub.s between the front face and the back face and a refractive index n.sub.s; and a coating applied to the front face. The coating comprises one or more coating layers. For at least one wavelength λ.sub.g in the range from 390 nm to 700 nm, the coating satisfies one of the following criterion: n.sub.c<n.sub.s; or n.sub.c>n.sub.s, and $d_c<\frac{k}{\sqrt{n_c^2-n_s^2}}.Math.\arctan \sqrt{\frac{n_s^2-1}{n_c^2-n_s^2}};$
n.sub.c is a mean refractive index of the coating layers, weighted by thickness; do is a total thickness of the coating; thicknesses are determined in a direction perpendicular to the front face; and k=λ.sub.g/4π.

The disclosure relates to an optical system for an augmented reality apparatus, comprising: an image projection source; and a polarizing beam splitter. The polarizing beam splitter has a beam splitting side adjacent to the image projection source and a transmission side facing away from the image projection source. The polarizing beam splitter is arranged such that light emitted from the image projection source is able to be non-perpendicularly incident on the beam splitting side and be at least partially reflected. The polarizing beam splitter is configured such that when light is incident on the beam splitting side, a polarized light component passes through the polarizing beam splitter and is transmitted through the transmission side thereof, and a polarized light component is reflected from the beam splitting side. The optical system also comprises a polarizer disposed between the image projection source and the beam splitting side of the polarizing beam splitter.

Augmented reality glasses including a first image source, a second image source and a lens set are provided. The first image source emits a first image beam. The second image source emits a second image beam. The lens set includes a first lens and a second lens and disposed on the path of the image beams. A gap is disposed between the first lens and the second lens. The refractive index of the gap is lower than that of the first lens. The image beams enter the lens set at an incident surface of the lens set, are reflected at a first surface of the first lens, and exit the lens set at an exit surface. The optical path length of the first image beam from the first image source to the eyes is different from that of the second image beam from the second image source to the eyes.

An optical element for expanding and uniforming a beam of light. The optical element includes a plurality of layers of a first type and plurality of layers of a second type arranged as a stack of layers. The stack of layers includes an input facet for receiving a beam of light and an output facet to output expanded and uniformed beam of light. The stack of layers forms a right triangular prism having a first side and a second side of a same width.

The disclosure relates to an optical system for an augmented reality apparatus, comprising: an image source; and a polarizing beam splitter. The polarizing beam splitter has a beam splitting side adjacent to the image source and a transmission side facing away from the image source. The polarizing beam splitter is arranged such that light emitted from the image source is able to be non-perpendicularly incident on the beam splitting side and be at least partially reflected. The polarizing beam splitter is configured such that when light is incident on the beam splitting side, a polarized light component, whose polarization is in a first direction, passes through the polarizing beam splitter and is transmitted through the transmission side thereof, and a polarized light component, whose polarization is in a second direction perpendicular to the first direction, is reflected from the beam splitting side. The optical system also comprises a polarizer disposed between the image source and the beam splitting side of the polarizing beam splitter, and the polarizer is configured to allow polarized light, whose polarization is in the second direction, to be transmitted therethrough and polarized light, whose polarization is in the first direction to be absorbed.

A head-mounted display according to the present embodiment includes a reflective member arranged in front of a user and configured to reflect at least part of display light for forming a display image toward the user, and a beam splitter arranged between the reflective member and an eye of the user and configured to reflect the display light toward the reflective member and to transmit the display light that has been reflected by the reflective member, in which transmittance of the beam splitter in a direction from a first position above the eye of the user toward the eye is equal to transmittance of the beam splitter in a direction from a second position below the eye of the user toward the eye.

Embodiments discussed herein refer to generating multiple laser beams from a single beam source. Single source multi-beam splitters can produce multiple beams from a single source, precisely control the exit angle of each beam, and ensure that each beam has substantially the same intensity.

Provided are an optical system for an augmented reality apparatus and an augmented reality apparatus. The optical system includes an image source; a polarizing beam splitter including a polarizing beam splitting film and a polarizing film; a polarizer disposed between the image source and the beam splitting side of the polarizing beam splitter; a wave plate adjacent to the beam splitting side; a semi-reflector located downstream of the wave plate in an optical path of the reflected light; and an additional wave plate and an additional polarizer which are sequentially located distal to the semi-reflector. The image source has a planar image source for emitting light, wherein a plane where the beam splitting side of the beam splitter component locates is at a first angle (β) relative to a normal of the image source, the first angle has a value between 11° and 79°.