Abstract: A wavelength conversion element, a forming method of the wavelength conversion element, a wavelength conversion module and a projection device are provided. The wavelength conversion element includes a wavelength conversion material, a binder, a filling material and a plurality of cavities. The wavelength conversion material is dispersed in the binder to form a wavelength conversion layer. The filling material is located in the wavelength conversion layer. The cavities are located in the wavelength conversion layer, wherein the filling material fills some of the cavities. The wavelength conversion module includes a substrate and the above wavelength conversion element. The projection device includes the above wavelength conversion module, an excitation light source, a light valve and a projection lens. The disclosure enables the projection device to have good conversion efficiency and reliability.

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: A rear projection screen includes a prism film, a first diffusion layer, a second diffusion layer and a light absorbing film sequentially disposed along a first direction. The prism film includes a first light-transmitting substrate and prism structures, wherein the prism structures are disposed on a surface of the first light-transmitting substrate away from the first diffusion layer. The prism structures receive an image beam and guide the image beam to be transmitted along the first direction. The first diffusion layer and the second diffusion layer have different refractive indexes. There are light-absorbing structures disposed in the light absorbing film, and the light-absorbing structures are arranged spaced apart from each other.

Abstract: A wavelength conversion module including a substrate and a wavelength conversion layer is provided. The substrate includes an axis, and the axis is located at the center of the substrate. The wavelength conversion layer is located on the substrate and includes two first wavelength conversion layers and a second wavelength conversion layer. Each of the first wavelength conversion layers includes a wavelength conversion material and a first bonding material. The second wavelength conversion layer is located between the two first wavelength conversion layers in a radial direction from the axis of the substrate to an edge of the substrate, and the second wavelength conversion layer includes the wavelength conversion material and a second bonding material. The first bonding material is different from the second bonding material. Moreover, a projection device and a forming method of the wavelength conversion module are also provided.

Abstract: The disclosure provides a projector, an image generation device, and an image generation method thereof. The projector includes an image generator, a light combiner, and a projection lens. The image generator includes light valves and generates an image beam. The light combiner includes a diffusing and filtering component, which generates a combined beam, and the image generator receives the combined beam from the diffusing and filtering component. In a first time period, the light combiner converts a first input beam into partial beams. The partial beams are transmitted to the light valves respectively. In a second time period, the light combiner receives a second input beam. The diffusing and filtering component filters out one of the partial beams, and the other of the partial beams are transmitted with the second input beam respectively to the light valves.

Abstract: A wavelength conversion module, a method for forming a wavelength conversion module, and a projection device are provided. The wavelength conversion module includes a substrate and a wavelength conversion layer. The wavelength conversion layer is located on the substrate and has a plurality of first holes. The wavelength conversion layer includes a wavelength conversion material, a first bonding material, and a first filling adhesive material. The wavelength conversion material is dispersed in the first bonding material. The first filling adhesive material is configured to fill at least a portion of the first holes. The projection device includes the wavelength conversion module, an excitation light source, a light valve, and a projection lens. The wavelength conversion module provided herein has good conversion efficiency and reliability.

Abstract: A projection screen including a light absorbing film and a projection film is provided. The light absorbing film includes a transparent layer and a plurality of light absorbing microstructures, where the light absorbing microstructures are embedded in the transparent layer and arranged at intervals, each of the light absorbing microstructures is asymmetrical to a reference plane, the transparent layer has two surfaces opposite to each other, and the reference plane passes through a geometric center of each of the light absorbing microstructures and is parallel to each of the surfaces, and there is a space between each of the light absorbing microstructures and each of the surfaces. The projection film and the light absorbing film are stacked on each other. A light absorbing film is also provided, and the projections screen and the light absorbing film have good optical quality.

Abstract: A wavelength-converting wheel includes a motor, a turntable, a pressing ring, a first balance block and an adhesive layer. The motor has a rotating shaft. The turntable has an inner ring portion and an annular irradiation portion. The inner ring portion is sleeved on the rotating shaft. The annular irradiation portion is connected to an outer edge of the inner ring portion. The pressing ring is sleeved on the rotating shaft and pressed and abutted against the inner ring portion. The pressing ring has a first surface and a second surface. The second surface faces the inner ring portion. The first balance block is disposed on the first surface. The adhesive layer is adhered between the second surface of the pressing ring and the inner ring portion. A heat insulation structure is disposed in the projection direction where the first balance block is projected on the inner ring portion.

Abstract: An illumination system configured to provide an illumination beam and including an excitation light source and a wavelength conversion module is provided. The excitation light source is configured to emit an excited beam. The wavelength conversion module is located on a transmission path of the excited beam, and has an annular wavelength conversion region. A first part of the excited beam is incident to the annular wavelength conversion region and converted into a first color light, and a second part of the excited beam is incident to the wavelength conversion module to form a second color light. A proportional value range of the second part of the excited beam and the excited beam ranges between 5% and 30%. Moreover, a projection apparatus is also provided. The illumination system of the invention has a simple structure and a concise optical path layout.

Abstract: A writable projection screen includes a substrate, a reflective layer and a writing layer. The reflective layer is disposed on the substrate, and the writing layer has a light receiving surface. The light receiving surface is adapted to receive a projection light beam. A roughness of the light receiving surface is between 5 ?m and 30 ?m. The substrate is disposed between the reflective layer and the writing layer, or the reflective layer is disposed between the substrate and the writing layer. The writable projection screen has good quality for displaying an image and can be used for being written by a variety of pens.

Abstract: A wavelength-converting wheel, for converting an excitation beam having an output power greater than or equal to 100 W into a conversion beam, is provided. The wavelength-converting wheel includes a turntable having an annular irradiation portion, an adhesive layer disposed at the annular irradiation portion, a reflective layer disposed on the adhesive layer, and a wavelength-converting layer. The wavelength-converting layer is disposed on the reflective layer and has a light receiving surface configured to be irradiated by the excitation beam. The invention further provides an illumination system including the wavelength-converting wheel, and a projection apparatus including the illumination system. The heat dissipating ability of the wavelength-converting wheel is improved. The material of the wavelength-converting layer is not deteriorated or damaged due to the heat of the excitation beam.

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 projector including an illumination system, a light valve and a projection lens is provided. The illumination system is configured to provide an illumination beam, and includes a light source and a diffusion element. The light source is configured to provide an exciting beam. The diffusion element is located on a transmission path of the exciting beam, and configured to receive the exciting beam for outputting at least part of the illumination beam. The diffusion element includes at least one first diffusion region and at least one second diffusion region surrounding the first diffusion region. A haze of the first diffusion region is greater than a haze of the second diffusion region. The light valve is located on a transmission path of the illumination beam, and configured to convert the illumination beam into an image beam. The projection lens is located on a transmission path of the image beam.

Abstract: A wavelength-converting wheel has a light incident side. The wavelength-converting wheel includes a disc, a heat conductive glue, a reflective layer, a plurality of protrusions, a heat conductive glue, and a wavelength-converting layer. The disc has an inner ring portion and an annular portion. The annular portion is connected to an outer edge of the inner ring portion. The annular portion includes a protrusion structure region. The protrusions are disposed in the protrusion structure region and protrude toward the light incident side. The heat conductive glue is disposed on the protrusion structure region. The reflective layer is disposed on the heat conductive glue. The wavelength-converting layer is disposed on the reflective layer and has a light receiving surface facing the light incident side.

Abstract: A projection screen includes a substrate, a plurality of prism structures, and a plurality of light absorbing structures. The substrate includes a first surface adjacent to the projector and a second surface away from the projector. The prism structures are disposed on the first surface, and each of the prism structures includes a first inclined surface, a second inclined surface, and a bottom surface. The first inclined surface is configured to receive and reflect projection light beams. There is a first angle between the first inclined surface and the bottom surface, and a second angle between the second inclined surface and the bottom surface. The first angle is less than or equal to the second angle. The light absorbing structures are respectively disposed on at least a portion of the second inclined surface of each of the prism structures. The light absorbing structures are configured to absorb ambient light.

Abstract: A wavelength conversion element, a forming method of the wavelength conversion element, a wavelength conversion module and a projection device are provided. The wavelength conversion element includes a wavelength conversion material, a binder, a filling material and a plurality of cavities. The wavelength conversion material is dispersed in the binder to form a wavelength conversion layer. The filling material is located in the wavelength conversion layer. The cavities are located in the wavelength conversion layer, wherein the filling material fills some of the cavities. The wavelength conversion module includes a substrate and the above wavelength conversion element. The projection device includes the above wavelength conversion module, an excitation light source, a light valve and a projection lens. The disclosure enables the projection device to have good conversion efficiency and reliability.

Abstract: An illumination system including an exciting light source module, a wavelength conversion device and a light uniforming module is provided. The exciting light source module is configured to emit an exciting beam. The wavelength conversion device is disposed on a transmission path of the exciting beam and is configured to rotate around a central axis. The light uniforming module is disposed on the transmission path of the exciting beam and between the exciting light source module and the wavelength conversion device. After the exciting beam emitted from the exciting light source module passes through the light uniforming module, the exciting beam forms a light spot on the wavelength conversion device. The energy intensity distribution of the light spot along the radial direction about the central axis is that the energy intensity is lower in the center and higher on the two sides. A projection apparatus is also provided.

Abstract: A light source module includes a plurality of light combining elements, a plurality of first light emitting elements, and a plurality of second light emitting elements. Each of the light combining elements has a first reflecting surface and a second reflecting surface. Each of the first light emitting elements emits a first illuminating beam, and one of the first reflecting surfaces reflects the first illuminating beam to be transmitted along a light combining direction. Orthographic projections of the light combining elements on a reference plane are connected in sequence, and the reference plane is perpendicular to the light combining direction. Each of the second light emitting elements emits a second illuminating beam, and one of the second reflecting surfaces reflects the second illuminating beam to be transmitted along the light combining direction. In addition, a projector having the light source module is also provided.

Abstract: A wavelength conversion module, a forming method of a wavelength conversion module, and a projection device are provided. The wavelength conversion module includes a substrate and a plurality of wavelength conversion units. The wavelength conversion units are located on the substrate, wherein the wavelength conversion units include a first wavelength conversion unit and a second wavelength conversion unit, the first wavelength conversion unit includes a first wavelength conversion material and a first doping material, the second wavelength conversion unit includes a second wavelength conversion material and a second doping material, the first wavelength conversion material and the second wavelength conversion material are different from each other, and the first doping material and the second doping material are different from each other. By the wavelength conversion units comprising different doping materials, low cost, good heat resistance and efficient light emitting are achieved.

Abstract: An illumination system includes an exciting light source, a first lens set, a dichroic element, a wavelength-converting element and a beam splitter. The exciting light source emits an excitation beam. The dichroic element reflects the excitation beam to the first lens set. The first lens set has an optical axis. The excitation beam is incident into the first lens set in a direction parallel to the optical axis and passes through the first lens set. The beam axis of the excitation beam is noncoaxial with the optical axis. The wavelength-converting element has a reflective region and a wavelength-converting region. The wavelength-converting region converts the excitation beam into a converted beam, which passes through the dichroic element and the beam splitter. The reflective region reflects the excitation beam to the first lens set and the beam splitter. The beam splitter splits the excitation beam into two branch excitation beams.