Abstract: An illumination system, a projection apparatus, and a projection method of the projection apparatus are provided. The illumination system includes an excitation light source, a light combination element, a light wavelength conversion module, and an actuator. The light combination element is disposed on a transmission path of an excitation beam emitted from the excitation light source. The light wavelength conversion module is disposed on a transmission path of the excitation beam transmitted from the light combination element and has a plurality of optical areas. The actuator is coupled to the light combination element to change a rotation angle of the light combination element, such that the excitation beam transmitted from the light combination element is transmitted to the plurality of optical areas of the light wavelength conversion module via different transmission paths.

Abstract: An illumination system, a projection apparatus, and a projection method of the projection apparatus are provided. The illumination system includes an excitation light source, a light combination element, a reflection element, a light wavelength conversion module, and an actuator. The reflection element is disposed on a transmission path of the excitation beam transmitted from the light combination element. The light wavelength conversion module is disposed on a transmission path of the excitation beam transmitted from the reflection element. The light wavelength conversion module has at least one reflection area and at least one light conversion area. The actuator is coupled to the reflection element to change a rotation angle of the reflection element, such that the excitation beam transmitted from the reflection element is transmitted to the at least one reflection area and the at least one light conversion area via different transmission paths.

Abstract: A projector includes an illumination system, a light valve, and a lens. The illumination system includes a scanning light source assembly and a wavelength conversion device. The scanning light source assembly provides an excitation beam. The excitation beam scans in a plurality of scanning directions. The wavelength conversion device is disposed on a transmission path of the excitation beam. The excitation beam scans the wavelength conversion device in the scanning directions in a plurality of time intervals respectively, and the excitation beam is converted into a color beam by the wavelength conversion device in one of the time intervals. The light valve is disposed on a transmission path of an illumination beam and converts the illumination beam into an image beam, wherein the illumination beam includes the color beam. The lens is disposed on a transmission path of the image beam.

Abstract: A projection device includes an illumination system, a light valve, and a projection lens. The illumination system includes an excitation light source, a wavelength conversion element, a light converging lens, and a light integration rod. The excitation light source provides an excitation beam. The wavelength conversion element converts the excitation beam into a conversion beam. A greatest width in a light spot formed on the wavelength conversion element by the excitation beam is a first distance. A greatest width in a light spot formed on the wavelength conversion element by the conversion beam is a second distance. The second distance is greater than the first distance. The light integration rod receives the conversion beam from the light converging lens. The conversion beam generated by the wavelength conversion element of the invention is effectively projected to the light integration rod.

Abstract: An illumination system includes at least one excitation light source, a holographic optical element and a phosphor wheel. The excitation light source provides a first color beam. The holographic optical element is located on a path of the first color beam and transmits the first color beam to the phosphor wheel along a first path. The phosphor wheel has a light wavelength conversion portion and a reflective portion. The light wavelength conversion portion converts the first color beam into a second color beam and reflects the second color beam back to the holographic optical element. The reflective portion reflects the first color beam back to the holographic optical element. The holographic optical element transmits the second color beam and the first color beam reflected from the phosphor wheel along a second path, and the first path is different from the second path. A projection apparatus is also provided.

Abstract: A projection apparatus and a light source apparatus are provided. The light source apparatus includes at least one first light source, at least one second light source, a wavelength conversion device, and a filter device. The wavelength conversion device is disposed on a transmission path of the first light beam from the first light source, and converts the first light beam into a conversion light beam. The filter device corresponds to the wavelength conversion device and is disposed between the first light source and the wavelength conversion device and disposed between the second light source and the wavelength conversion device. The filter device allows the first light beam and the conversion light beam to pass through, and reflects the second light beam. The projection apparatus and the light source apparatus have favorable light source utilization efficiency.

Abstract: The invention provides a wavelength conversion device, including a first wavelength conversion portion and a second wavelength conversion portion. The second wavelength conversion portion includes a wavelength maintenance zone and a plurality of wavelength conversion structures. When the second wavelength conversion portion is switched onto a transmission path of the excitation beam, a portion of the excitation beam is incident on the wavelength maintenance zone and becomes a second color beam, and another portion of the excitation beam is incident on the wavelength conversion structures and converted into a predetermined color beam. A first chromaticity coordinate value of the second color beam in color space is (x, y), a second chromaticity coordinate value of the second color beam, after being combined with the predetermined color beam by the dichroic element, in the color space is (x?, y?), and x??x and y??y.

Abstract: A head-mounted display including a transparent display, a main liquid crystal lens and a first liquid crystal lens is provided. The transparent display is configured to emit an image light beam. The main liquid crystal lens is disposed near the transparent display. The transparent display is disposed between the main liquid crystal lens and the first liquid crystal lens. The first liquid crystal lens is configured to receive an ambient light beam. The head-mounted display allows at least a part of the image light beam emitted from the transparent display passing through a pupil by phase modulating of at least a part of the main liquid crystal lens.

Abstract: A composite phase conversion element and a projection apparatus are provided. The composite phase conversion element is disposed on a transmission path of at least one beam, and includes at least one polarizing element, and the polarizing element includes multiple polarizing regions, where at least two of the polarizing regions have different polarization directions, the at least one beam simultaneously penetrates through at least two of the polarizing regions of the at least one polarizing element to respectively form at least two sub-beams, and polarization states of the two sub-beams correspond to the polarization directions of the at least two of the polarizing regions penetrated by the at least two sub-beams. Therefore, in a polarized 3D mode of the projection apparatus using the composite phase conversion element, color and brightness of a display image are uniform, and a user observes a 3D display image with good uniformity.

Abstract: A projection device and a light engine module thereof are provided. The light engine module includes a first dichroic element, a first light valve, a second light valve, a light combining element, a first light converging element, a second light converging element, a first light guiding element, and a second light guiding element. The first dichroic element divides an illumination beam into a first color beam and a second color beam. The first light valve converts the first color beam into a first image beam. The second light valve converts the second color beam into a second image beam. The light combining element is disposed on transmission paths of the first image beam and the second image beam. The first light guiding element guides the first color beam to the first light valve.

Abstract: A head-mounted display including an apparatus body including a first part and a second part connected to the first part and an image display device disposed in the apparatus body is provided. The image display device projects an image to a projection target and includes an image output element, a plurality of lens elements, a light diffuser, and an imaging element. The imaging element projects the image beam to the projection target to display the image. The lens elements include a first lens element and a second lens element. The image output element generates an intermediate image on a transmitting path of the image beam between the first and second lens elements. The light diffuser is disposed on the transmitting path of the image beam and in a predetermined interval where the intermediate image is located at the center.

Abstract: A head-mounted display apparatus including a main body, a mask, and a projection apparatus is provided. The mask is pivotally connected to the main body. The mask includes a reflection area. The reflection area has a first normal line. The projection apparatus is disposed inside the main body and adapted to project an image beam to a target. The projection apparatus includes a mirror. The mirror has a second normal line. An acute angle exists between normal projections of the first normal line and the second normal line on a reference plane.

Abstract: A light source module includes an excitation light source providing an excitation light beam; a light guiding apparatus disposed on a light path of the excitation light beam and; a light collecting element disposed on a first transmission path and a second transmission path; a light homogenizing element disposed on the first transmission path; and a wavelength conversion element disposed on the second transmission path. The light guiding apparatus swings sequentially along a reference axis of the light path. Through the swinging action, the excitation light beam is transmitted along the first transmission path and the second transmission path at a first timing and a second timing, respectively. Then, the excitation light beam passes through the light collecting element. The light homogenizing element receives the excitation light beam. The wavelength conversion element converts the excitation light beam passing through the light collecting element into an excited light beam.

Abstract: 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.

Abstract: A projection device for forming an image frame on a projection screen includes a first illumination system for emitting an illumination beam, a second illumination system for emitting an ultraviolet beam, a first light valve located on a transmission path of the illumination beam and for converting the illumination beam into a visible image beam, a lens located on a transmission path of the visible image beam and the ultraviolet beam and for projecting the visible image beam onto the projection screen to form an image frame area and projecting the ultraviolet beam onto the projection screen to form an opaque area, and a processor electrically connected to the first illumination system and the second illumination system and for controlling the first illumination system to emit the illumination beam and controlling the second illumination system to emit the ultraviolet beam. The image frame area partially overlaps the opaque area.

Abstract: A projection screen for receiving a visible image beam and an ultraviolet beam from a projection device is provided. The projection screen includes a substrate, an anti-reflection layer and an anti-ultraviolet layer. The substrate includes a first surface adjacent to the projection device, a second surface away from the projection device and opposite to the first surface, a scattering reflection layer disposed between the first surface and the second surface, and an ultraviolet absorption layer disposed between the first surface and the second surface. The scattering reflection layer scatters and reflects the visible image beam. The ultraviolet absorption layer absorbs the ultraviolet beam so as to be changed from a transparent state to an opaque state. The anti-reflection layer is disposed on the first surface. The anti-ultraviolet layer is disposed at the second surface. The ultraviolet absorption layer is located between the scattering reflection layer and the anti-ultraviolet layer.

Abstract: An illumination system including an excitation light source, a transparent substrate, a dichroic film, a first color wheel element and a light uniforming element are provided. The excitation light source emits a first color light. The first color wheel element includes a wavelength conversion material. The first color wheel element has a first side and a second side. The first color light passes through a solid structure of the transparent substrate and the dichroic film, and is transmitted to the first color wheel element and converted into a second color light by the wavelength conversion material. A first part of the second color light is transmitted towards the dichroic film, and is reflected back to the first color wheel element by the dichroic film to enter the light uniforming element. A second part of the second color light passes through the first color wheel element to enter the light uniforming element.

Abstract: An illumination system includes an excitation light source group, a first dichroic device, a second dichroic device, an actuation element, and a wavelength conversion device. The excitation light source group includes a plurality of excitation light sources. Each excitation light source provides an excitation beam. The first dichroic device configures the excitation beam to pass therethrough. The second dichroic device includes a plurality of dichroic elements which are arranged at intervals and reflect the excitation beam. The actuation element configures the excitation beam to pass through the second dichroic device in a first period through intervals between the dichroic elements, and configures the excitation beam to be reflected by the dichroic element in a second period. The wavelength conversion device converts the excitation beam into a conversion beam. The invention further provides a projection device having this illumination system.

Abstract: An illumination system including a first light-emitting module, a wavelength conversion unit, and a spherical-shell-shaped dichroic film is provided. The first light-emitting module emits a first color light including a first partial light and a second partial light. The first partial light is converged to the wavelength conversion unit, the second partial light passes by a location beside the wavelength conversion unit, and the wavelength conversion unit converts the first partial light into a converted light, where a wavelength of the converted light is greater than a wavelength of the first color light. The spherical-shell-shaped dichroic film is pervious to the at least one first color light, and reflects the converted light, where the converted light coming from the wavelength conversion unit is reflected by the spherical-shell-shaped dichroic film, and at least partially coincides with the second partial light. A projection apparatus is also provided.

Abstract: An illumination system, a projection apparatus, and a projection method of the projection apparatus are provided. The illumination system includes an excitation light source, a light combination element, a light wavelength conversion module, and an actuator. The light combination element is disposed on a transmission path of an excitation beam emitted from the excitation light source. The light wavelength conversion module is disposed on a transmission path of the excitation beam transmitted from the light combination element and has a plurality of optical areas. The actuator is coupled to the light combination element to change a rotation angle of the light combination element, such that the excitation beam transmitted from the light combination element is transmitted to the plurality of optical areas of the light wavelength conversion module via different transmission paths.