Abstract: A light concentrating backlight includes a light guide to guide light and a diffraction grating configured to diffractively couple out a portion of the guided light as diffractively coupled-out light and to concentrate the diffractively coupled-out light into an eyebox. A near-eye display system includes the light guide and the diffraction grating, and further includes a light valve array configured to modulate the diffractively coupled-out light to form an image in the eyebox. The formed image is configured to be viewable within the eyebox by a user.

Abstract: Provided is a light-source system, comprising excitation light source, first supplementary light source, first light-guiding assembly, wavelength conversion apparatus, and second light-guiding assembly. The excitation light source is for emitting excitation light; the first supplementary light source is for emitting first supplementary light. The first light-guiding assembly is for guiding the excitation light to the wavelength conversion apparatus. The wavelength conversion apparatus is for converting excitation light to excited light and irradiate onto the first light-guiding assembly. The first light-guiding assembly is for guiding excited light to irradiate onto the second light-guiding assembly. At least some components of the second light-guiding assembly are arranged on the light path from the first light-guiding assembly.

Abstract: A projection device includes a prism set, a digital micro-mirror device, a reflective component and a heat dissipation module. The prism set includes a light-incident side and a mirror-corresponding side opposite to each other, and includes a first light-emitting side and a second light-emitting side adjacent to each other. The digital micro-mirror device spatially corresponds to the mirror-corresponding side. An incident light is transmitted through the light-incident side to irradiate the digital micro-mirror device. When the digital micro-mirror device generates an on-state light, the on-state light is outputted through the first light-emitting side. When the digital micro-mirror device generates an off-state light, the off-state light is transmitted toward the reflective component and outputted through the second light-emitting side. The heat dissipation module spatially corresponding to the second light-emitting side is configured to absorb and convert the off-state light for heat dissipation.

Abstract: A wavelength conversion element according to an aspect of the present disclosure includes a substrate having a reflection surface, a wavelength converter that has a first surface on which excitation light that belongs to a first wavelength band is incident, a second surface located at a side opposite the first surface, and a third surface that intersects the first or second surface and converts the excitation light in terms of wavelength into fluorescence that belongs to a second wavelength band different from the first wavelength band, a holder that is so provided as to face the first or third surface and holds the wavelength converter in the direction along the direction in which the excitation light is incident and in a direction that intersects the light incident direction, and a fixer that fixes the holder.

Abstract: A projector moves a first imaging lens and a second imaging lens in a direction that intersects the optical axis of an imaging section to adjust the imaging range of the imaging section and moves the first imaging lens and the second imaging lens in the direction that intersects the optical axis of the imaging section to switch the imaging lens located in a position corresponding to the imaging section from one to another.

Abstract: An eyepiece unit with optical filters includes a set of waveguide layers including a first waveguide layer and a second waveguide layer. The first waveguide layer is disposed in a first lateral plane and includes a first incoupling diffractive element disposed at a first lateral position, a first waveguide, and a first outcoupling diffractive element. The second waveguide layer is disposed in a second lateral plane adjacent to the first lateral plane and includes a second incoupling diffractive element disposed at a second lateral position, a second waveguide, and a second outcoupling diffractive element. The eyepiece unit also includes a set of optical filters including a first optical filter positioned at the first lateral position and operable to attenuate light outside a first spectral band and a second optical filter positioned at the second lateral position and operable to attenuate light outside a second spectral band.

Abstract: A projector includes a light source, a light modulator, a projection optical apparatus, a cooler configured to cool a cooling target based on transformation of a refrigerant into a gas, and a controller configured to control the cooler. The cooler includes a refrigerant generator configured to generate the refrigerant, a refrigerant sender configured to send the generated refrigerant toward the cooling target, and a cooling blower configured to deliver air to the cooling target. The controller drives at least part of the cooler for a predetermined period in the state in which the projector is not in operation.

Abstract: A projection-type display device includes: a light source; a dust-proof case; heat-dissipating fins; a heat-dissipation fan that causes cooling air to flow into the heat-dissipating fins; a prism unit that is provided inside the dust-proof case and that separates light from the light source into a multiplicity of illumination light beams; an internal circulation fan; heat-receiving fins; and heat pipes that connect the heat-dissipating fins and the heat-receiving fins. The heat-receiving fins and the heat-dissipating fins are both formed in a substantially rectangular parallelepiped shape, each having, as cooling air inflow surfaces that are effective in heat dissipation or heat reception, a first surface and a second surface whose area is greater than the first surface. The cooling airflow inside the dust-proof case that is supplied by the internal circulation fan flows from the first and second surfaces of the heat-receiving fins.

Abstract: Provided is an information processing device including an image analysis unit that analyzes content of an input image projected by a projection device, and a projection position determination unit that determines a projection area in a projection space onto which the input image is projected by the projection device on the basis of an analysis result obtained by analyzing the input image.

Abstract: An illumination device has a plurality of first lens elements to collect incident light beams, and a field lens to guide each of the light beams that have passed through the plurality of first lens elements to an entire region of a specific area. The plurality of first lens elements include at least two first lens elements having different lens diameters from each other. When one of the two first lens elements has a lens diameter d and a focal length f, another of the two first lens elements has a lens diameter k×d (where k is a value larger than zero but other than 1) and a focal length k×f.

Abstract: A projection device including a lens module and an actuating module is provided. The lens module includes at least one lens and is used for transferring an image beam. The actuating module is disposed beside the lens module, and is relatively close to the at least one lens. The actuating module includes a frame, a transparent element and at least one actuator. The transparent element is fixed on the frame. The actuator is disposed on at least one side edge of the frame, and is connected to the frame. In a light emission direction of the lens module, an orthographic projection of the actuator on a first reference plane does not overlap with an orthographic projection of the at least one lens on the first reference plane.

Abstract: An illumination system and a projection apparatus are provided. The illumination system includes an excitation light source, a light combining device, a filter module, and a wavelength conversion module. The light combining device is disposed on a transmission path of an excitation light beam emitted from the excitation light source. The filter module is disposed on a transmission path of the excitation light beam transmitted from the light combining device. The filter module includes a light passing-through area allowing the excitation light beam to pass through and at least one filter area reflecting the excitation light beam. The wavelength conversion module is disposed on a transmission path of the excitation light beam reflected by the at least one filter area. The wavelength conversion module converts the excitation light beam reflected by the at least one filter area into a converted light beam and reflects the converted light beam.

Abstract: An optical assembly includes a first optical waveguide, a first in-coupler coupled with the first optical waveguide and a projector configured to project image light toward a first side of the first optical waveguide. The optical assembly also includes a first scanning reflector optically coupled with the projector and disposed on a second side of the first optical waveguide that is opposite to the first side. The projector is configured to project image light. The first scanning reflector is configured to receive the image light and to redirect the image light across a first range of directions. The first in-coupler is configured to redirect a first portion of the image light so that the first portion of the image light undergoes total internal reflection inside the first optical waveguide.

Abstract: An optical device includes a range of angularly selective reflectors are contained within an optical waveguide substrate and substantially optimized according to their reflector order within the sequence of reflectors. This configuration of reflectors ensures that the required angular information is passed through to the correct reflector within the sequence. The angular response in addition reduces or eliminates formation of secondary images carried to successive reflectors, resulting in undesired artefacts.

Abstract: A dynamic brightness adjusting method is used for adjusting output brightness of an image projected by a projector. The method controls a lighting component of the projector to emit light in an adjustable lighting power, and controls a light limiting device disposed in front of the lighting component to allow the light to pass through in an adjustable light-passing rate. In an embodiment, the method adjusts the lighting power and the light-passing rate at the same time. In another embodiment, according to a brightness range in which a nominal maximum brightness value relative to an input image is located, the method fixes the lighting power and adjusts the light-passing rate according to the fixed lighting power and the nominal maximum brightness value, or fixes the light-passing rate and adjusts the lighting power according to the fixed light-passing rate and the nominal maximum brightness value.

Abstract: Provided is an observation optical system used for observing an image displayed on an image display surface. The observation optical system includes, in order from an observation surface side to the image display surface side, a first lens having a positive refractive power, and a second lens having a positive refractive power. The first lens is a Fresnel lens, and a focal length f1 of the first lens and a focal length f2 of the second lens are each appropriately set.

Abstract: A projector includes a laser light source apparatus, a fluorescence light source apparatus, a first integrator, a second integrator, a superimposing lens that laser light and fluorescence enter, a light modulator on which the laser light and the fluorescence having exited out of the superimposing lens are incident and which includes a plurality of pixels each formed of a plurality of sub-pixels, a microlens array including a plurality of microlenses provided in correspondence with the plurality of pixels, and a projection optical apparatus that projects light outputted from the light modulator. The first integrator includes a first multi-lens array including a plurality of first lenslets. The second integrator includes a second multi-lens array including a plurality of second lenslets. A lens division number of the first multi-lens array is greater than a lens division number of the second multi-lens array.

Abstract: A projection display device includes: a light source that emits a first laser light for displaying a projection and a second laser light for inspection; a scanning drive mirror that reflects the first laser light and the second laser light emitted from the light source, and uses the first laser light and the second laser light in scanning; a light diffusion unit that allows the first laser light used in the scanning by the scanning drive mirror to be transmitted through the light diffusion unit and diffuses the first laser light; a light selection unit that allows the first laser light to be transmitted through the light selection unit and reflects the second laser light at a position on an emission surface of the light diffusion unit; and a light detection unit that detects the second laser light reflected by the light selection unit.

Abstract: Embodiments herein describe AR systems that provide occluded AR content to a user while maintaining the perspective of the user. In one embodiment, the AR system includes an optical cloak that contains a mask display device and an AR display device and one or more focusing elements and a prism for focusing light captured from the user's environment. As the light enters the optical cloak, the mask display device occludes a portion of the user's view to generate a black silhouette. The AR system then combines AR content displayed by the AR display device with the image of the environment such that the location of the AR content overlaps with the location of the black silhouette. Furthermore, the spacing and characteristics of the focusing elements and the prism are set to maintain the perspective of the user as the light passes through the optical cloak.

Abstract: The disclosure provides a method and a projection device for focal length calibration. The projection device includes a distance sensor, a projection lens, and a controller. The method includes: defining, by the distance sensor, a detection area on a projection surface; dividing, by the controller, the detection area into a plurality of reference areas; detecting, by the distance sensor, a reference distance between the projection device and each reference area; finding, by the controller, at least one first area and at least one second area in the reference areas; and performing, by the controller, a focusing operation of the projection lens only based on the reference distance of each second area.