There is provided an optical element including a light guide, an incoupler, and a beam splitter disposed in an optical path of a display beam between the incoupler and a light engine to generate the display beam. The display beam may comprise first and second beams. The beam splitter may split the display beam to form a first offspring beam including the first beam and a first portion of the second beam, and to form a second offspring beam including a second portion of the second beam. The first and second offspring beams may be incident upon the incoupler at first and second incidence positions respectively. The first incidence position may be different than the second incidence position. The incoupler may direct at least a portion of each of the first and second offspring beams into the light guide to form incoupled first and second offspring beams respectively.

A diffractive image combiner is provided, to increase an exit pupil dimension, thereby improving user experience. The diffractive image combiner includes a first diffractive optical element DOE and a second diffractive optical element DOE. The first diffractive optical element DOE is parallel to the second diffractive optical element DOE. A grating vector of a first incidence point in the first diffractive optical element DOE is the same as a grating vector of a second incidence point in the second diffractive optical element DOE. The first incidence point is used to convert an incident light ray that meets a Bragg condition into a first diffracted light ray and a first transmitted light ray. The first transmitted light ray is incident to the second incidence point. The second incidence point is used to convert the first transmitted light ray into a second diffracted light ray.

A light source apparatus according to an aspect of the present disclosure includes a first light source section, a second light source section, a first polarization separator, a second polarization separator that reflects part of second light and transmits the other part of the second light, a first phase retarder which is disposed between the first polarization separator and the second polarization separator and on which the part of the second light reflected off the second polarization separator is incident, a wavelength conversion layer that converts the first light and the part of the second light into third light having a second wavelength band and outputs the third light toward the first polarization separator, and a first light focusing optical system disposed between the wavelength conversion layer and the first polarization separator. The wavelength conversion layer has a first surface via which the third light exits and a second surface that intersects with the first surface. The first light is focused by the first light focusing optical system and enters the wavelength conversion layer at least via the second surface thereof, and the second light enters the wavelength conversion layer via the first surface thereof.

A light source device according to the present disclosure includes a light emitting element having a light emitting surface configured to emit first light having a first wavelength band, a wavelength conversion member which includes a phosphor, and which is configured to convert the first light emitted from the light emitting element into second light having a second wavelength band different from the first wavelength band, and a reflecting member having a reflecting surface configured to reflect the second light generated by the wavelength conversion member. The wavelength conversion member has a first face which crosses a longitudinal direction of the wavelength conversion member, and which emits the second light, a second face which crosses the longitudinal direction of the wavelength conversion member, and which is located at an opposite side to the first face, and a third face crossing the first face and the second face. The light emitting surface is disposed so as to be opposed to at least a part of the third face. The reflecting surface is disposed so as to be opposed to the second face. At least one of the second face and the reflecting surface is a rough surface.

A polarizing rotation device including a rotation shaft, a driving element and a polarizing element is provided. The driving element is configured to drive the rotation shaft to rotate. The polarizing element is connected to the rotation shaft and is disposed on a transmission path of at least one beam, where the driving element is configured to drive the polarizing element to rotate sequentially while taking the rotation shaft as a rotation central axis, and when the polarizing element is rotated, the at least one beam penetrates through the polarizing element, and the at least one beam penetrating through the polarizing element has different polarization states at different time. Therefore, when a projection device is in a polarized stereoscopic mode, a color or brightness of a display image is uniform, and a user observes a 3D display image with good uniformity.

An illumination system including an excitation light source, a wavelength converting element, and a region-based light splitter is provided. The excitation light source provides an excitation beam. The wavelength converting element is disposed on a transmission path of the excitation beam to convert the excitation beam into an excited beam. The region-based light splitter is disposed on the transmission path of the excitation beam and includes at least one first region and at least one second region. The first region reflects the excitation beam and allows the excited beam to pass through. The second region allows the excitation beam and the excited beam to pass through. The excitation beam reflected by the region-based light splitter is transmitted toward the wavelength converting element. A projection apparatus including the illumination system is also provided.

A projection apparatus and an illumination system that includes an excitation light source, a beam filter module, a wavelength conversion module and a homogenizing element are provided. The beam filter module includes a light effective region and is disposed on a transmission path of an excitation beam. The wavelength conversion module includes a wavelength conversion region and is disposed on a transmission path of the excitation beam reflected by the light effective region. The wavelength conversion region converts the excitation beam into a conversion beam. The conversion beam from the wavelength conversion module passes through the light effective region and then forms at least one color light. An optical axis of the excitation beam incident on the light effective region and a normal line of the light effective region are respectively not parallel to a central axis of the homogenizing element.

The present disclosure provides a light source system and a projection device. The light source system includes: a laser light source, a supplementary light source, a wavelength conversion device and an imaging subsystem. The laser light source is configured to emit laser light. The supplementary light source is configured to emit supplementary light. The wavelength conversion device is configured to convert the laser light into excited light and output first light including the excited light and the laser light. The imaging subsystem is configured to form a first light imaging beam, a supplementary light imaging beam, and a mixed light imaging beam; the imaging subsystem includes a light combining device and a reflective assembly, the light combining device is placed at an intersection of the first light imaging beam and the supplementary light imaging beam, and the reflective assembly is placed between the wavelength conversion device and the light combining device.

Head-mounted virtual and augmented reality display systems include a light projector with one or more emissive micro-displays having a first resolution and a pixel pitch. The projector outputs light forming frames of virtual content having at least a portion associated with a second resolution greater than the first resolution. The projector outputs light forming a first subframe of the rendered frame at the first resolution, and parts of the projector are shifted using actuators, such that physical positions of light output for individual pixels occupy gaps between the old locations of light output for individual pixels. The projector then outputs light forming a second subframe of the rendered frame. The first and second subframes are outputted within the flicker fusion threshold. Advantageously, an emissive micro-display (e.g., micro-LED display) having a low resolution can form a frame having a higher resolution by using the same light emitters to function as multiple pixels of that frame.

An image light generation device includes a first panel configured to emit a first image light including a blue wavelength region, a second panel configured to emit a second image light including a wavelength region different from the blue wavelength region, and a color combining prism configured to combine the first image light and the second image light. The first panel includes a plurality of first pixels, each of the plurality of first pixels includes a first light emitting element, and a first transistor provided corresponding to the first light emitting element, the second panel includes a plurality of second pixels, each of the plurality of second pixels includes a second light emitting element, and a second transistor provided corresponding to the second light emitting element, and a size of the first transistor is greater than a size of the second transistor.