The disclosure generally relates to beamsplitters useful in color combiners, and in particular color combiners useful in small size format projectors such as pocket projectors. The disclosed beamsplitters and color combiners include a tilted dichroic reflective polarizer plate having at least two dichroic reflective polarizers tilted at different angles relative to incident light beams, with light collection optics to combine at least two colors of light.

A light guiding unit includes a light guiding member that light enters and an angle converter that the light from the light guiding member enters. The light guiding member has a side surface and a light exiting end surface which intersects the side surface and via which the light exits. The angle converter includes a light incident section on which the light from the light guiding member is incident, a light exiting section via which the light incident on the angle converter exits, and a reflection section that reflects the light incident via the light incident section toward the light exiting section. The refractive index of the interior of the angle converter is greater than the refractive index of air. The refractive index of the interior of the light guiding member is greater than the refractive index of the interior of the angle converter.

A wearable display system includes one or more emissive micro-displays, e.g., micro-LED displays. The micro-displays may be monochrome micro-displays or full-color micro-displays. The micro-displays may include arrays of light emitters. Light collimators may be utilized to narrow the angular emission profile of light emitted by the light emitters. Where a plurality of emissive micro-displays is utilized, the micro-displays may be positioned at different sides of an optical combiner, e.g., an X-cube prism which receives light rays from different micro-displays and outputs the light rays from the same face of the cube. The optical combiner directs the light to projection optics, which outputs the light to an eyepiece that relays the light to a user's eye. The eyepiece may output the light to the user's eye with different amounts of wavefront divergence, to place virtual content on different depth planes.

A reticle unit equipped with an optical apparatus such as a riflescope includes: red and green light sources radiating red light and green light; a disc-like shaped reticle substrate that has a diffraction grating formed at substantially the center of a surface having substantially circular shape; and red and green mirror members converge light radiated from the red and green light sources, make incidence on the reticle substrate from corresponding side surface portions of the reticle substrate to illuminate the diffraction grating so as to emit first order diffracted light reflected and diffracted by the diffraction grating along a normal direction of the diffraction grating.

A light source apparatus according to an embodiment of the present technique includes a first light source section, a second light source section, a third light source section, and a synthesis section. The first light source section includes a plurality of red laser light sources arranged in an array. The second light source section includes a plurality of green laser light sources arranged in an array. The third light source section includes a plurality of blue laser light sources arranged in an array. The synthesis section synthesizes red laser light emitted from the first light source section, green laser light emitted from the second light source section, and blue laser light emitted from the third light source section to generate white light.

A projection display apparatus includes: a laser light source which emits a blue light; a wheel which includes a light emitting body provided on a reflection surface of a substrate, the light emitting body emitting an emission light when the emitting body is irradiated with the blue light; a bandpass filter which is disposed on an optical path on which the emission light of the light emitting body travels; a plurality of optical modulating elements which modulate the blue light and the emission light from the light emitting body; and a projection unit which projects the light modulated by the plurality of optical modulating elements. The bandpass filter allows transmission of part of lights whose wavelength bands are 560 nm to 590 nm in the emission light of the light emitting body, and reflects other lights.

A light-emitting device includes: a first light-emitting element including a first light-emission surface through which first light is emitted along a first optical axis; a second light-emitting element disposed apart from the first light-emitting element in a first direction that is perpendicular to the first optical axis, the second light-emitting element including a second light-emission surface through which second light is emitted along a second optical axis that is inclined with respect to the first optical axis in a second direction opposite to the first direction; and a third light-emitting element disposed apart from the first light-emitting element in the second direction, wherein the third light-emitting element includes a third light-emission surface through which third light is emitted along a third optical axis that is inclined with respect to the first optical axis in the first direction.

A light source device including: a light source section which generates any one of blue light, red light, and green light; a phosphor which generates a fluorescence including the two colors other than the color of the light emitted from the light source section; a color-changing section which changes one of the two colors of the fluorescence emitted from the phosphor to another color regularly and irradiates it to the image-forming element; and a light path-switching section which switches a light path in which a fluorescence excited by the color light emitted from the light source section passes towards the color-changing section and a light path in which the color light emitted from the light source section passes towards the image-forming element regularly.

An illuminating device may include a light source, an optical unit configured to adjust direction of light from the light source, a reflector, a light pipe, and an exciter. The light pipe may receive light having a first wavelength from the optical unit and direct the light having the first wavelength onto the exciter. The exciter may convert the light having the first wavelength into light having the second wavelength and reflects the light having the second wavelength to the reflector. A circumferential wall of the light pipe is configured to reflect the light having the first wavelength and to transmit the light having the second wavelength.

A waveguide display includes a waveguide, three input gratings configured to couple display light in different respective colors into the waveguide, one or more first middle gratings configured to receive and redirect the display light from the three input gratings, a second middle grating configured to diffract, at two or more regions of the second middle grating, the display light from the one or more first middle gratings, and an output grating configured to couple the display light from each of the two or more regions of the second middle grating out of the waveguide at two or more regions of the output grating.