An illumination system and a projection apparatus are provided. The illumination system includes a coherent light source, an optical module, and a first light-diffusing device. The coherent light source emits a coherent light beam. The optical module and the first light-diffusing device are located on a transmission path of the coherent light beam. The optical module has an optical surface and a light-diffusing surface, and the coherent light beam focuses on a first position through the optical surface of the optical module. The first light-diffusing device is located at the first position or in vicinity of the first position. The coherent light beam passes through the first light-diffusing device so that a diffusion angle of the coherent light beam is sequentially changed. A display frame exhibiting a uniform luminance is thereby provided by the illumination system and the projection apparatus of the invention.

A light source unit includes a first light source configured to emit light in a first wavelength range, a second light source configured to emit light in a first wavelength range, a first dichroic mirror configured to reflect the light in the second wavelength range incident thereon at a first incident angle and transmit the light in the second wavelength range incident thereon at a second incident angle, which is different from the first incident angle, and a second dichroic mirror configured to reflect the light in the second wavelength range that has passed through the first dichroic mirror, wherein after having been reflected by the second dichroic mirror, the light in the second wavelength range is incident on the first dichroic mirror at the first incident angle to then be reflected by the first dichroic mirror.

Described examples include an optical device having a first light source configured to provide a first light having a first characteristic. The optical device also has a second light source configured to provide a second light having a second characteristic. The optical device also has a combiner configured to combine the first light and the second light to provide a combined light. The optical device also has a spatial light modulator configured to modulate the combined light to provide modulated combined light. The optical device also has a divider configured to receive the modulated combined light and to direct a first portion of the modulated combined light having the first characteristic to a first target and to direct a second portion of the modulated combined light having the second characteristic to a second target.

A see-through head mounted display with controllable light blocking includes an optics module comprising a light source and image source positioned on a same side of an angled partially-reflective surface, wherein the light source projects light off the surface to the image source which reflects the light as image light to the surface which transmits the image light along a first axis. The display also includes a flat combiner positioned to reflect the image light off of a first side and simultaneously transmit incident light through the first and a second side, along an optical axis perpendicular to the first axis to provide a view of a displayed image overlaid onto a see-through view of the environment, and a controllable light blocking element arranged generally parallel to the flat combiner and in front of the second side to block light incident on the same optical axis as the image light.

An optical apparatus includes a light source unit, at least one first light modulation element, an illumination optical system configured to illuminate the first light modulation element using light from the light source unit, and a relay optical system configured to make conjugate with each other a predetermined surface on an optical path between the light source unit and the first light modulation element, and a surface of the first light modulation element. The relay optical system includes, in order from the predetermined surface to the first light modulation element, a first reflection surface having a positive power, a second reflection surface having a negative power, and a third reflection surface having a positive power. The relay optical system satisfies a predetermined condition.

An illumination system and a projection device are provided. The illumination system includes first excitation light sources, an excitation light source module, a wavelength conversion element and a light combining element. The excitation light source module includes second excitation light sources adapted to emit second excitation light beams and third excitation light sources adapted to emit third excitation light beams. The excitation light source module has a first symmetric axis and a second symmetric axis perpendicular to each other, where the second excitation light sources and the third excitation light sources are respectively arranged symmetrically relative to the first symmetric axis, and the second excitation light sources and the third excitation light sources are respectively arranged symmetrically relative to the second symmetric axis. The projection device includes the illumination system, a light valve and a projection lens. The illumination system and the projection device of the invention have smaller size, and are adapted to provide illumination beam and projection image with uniform color distribution.

Aspects for a wearable augmented reality (AR) device are described herein. The aspects may include a light engine that includes a micro-display configured to emit light to form an image, a polarized beam splitter positioned horizontally adjacent to the micro-display and configured to receive the emitted light that passes through the polarized beam splitter, and one or more first imaging lenses positioned horizontally adjacent to the polarized beam splitter and configured to receive the diverged light. One of the first imaging lenses may include a reflection surface configured to reflect and converge the light. The polarized beam splitter may include a reflective coating configured to reflect the converged light. The aspects may further include an optical waveguide configured to guide the converged light to a predetermined position.

A laser projector includes a laser assembly, a beam combination mirror group and a phase delaying component. The laser assembly includes a red laser light emitting region, a blue laser light emitting region and a green laser light emitting region. Red laser light is polarized in a first direction, green laser light is polarized in a second direction, and blue laser light is polarized in a third direction. The beam combination mirror group combines the red laser light, the blue laser light and the green laser light. The phase delaying component is on a light emitting path of at least one of the red laser light, the blue laser light the green laser light, and changes a polarization direction of the at least one of the red laser light, the blue laser light or the green laser light before being output by the beam combination mirror group.

An illumination system and a projection device are provided. The illumination system includes first excitation light sources, an excitation light source module, a wavelength conversion element and a light combining element. The excitation light source module includes second excitation light sources adapted to emit second excitation light beams and third excitation light sources adapted to emit third excitation light beams. The excitation light source module has a first symmetric axis and a second symmetric axis perpendicular to each other, where the second excitation light sources and the third excitation light sources are respectively arranged symmetrically relative to the first symmetric axis, and the second excitation light sources and the third excitation light sources are respectively arranged symmetrically relative to the second symmetric axis. The projection device includes the illumination system, a light valve and a projection lens. The illumination system and the projection device of the invention have smaller size, and are adapted to provide illumination beam and projection image with uniform color distribution.

Aspects of the present invention relate presentation of digital content, in a see-through display, representing a known location in an environment proximate to a head worn computer.