An optical system of the disclosure includes: a fluorescent unit that includes a phosphor region excited by a first color light beam to output fluorescent light including at least one color light beam, and outputs the first color light beam in a first period and outputs the fluorescent light in a second period; one or two light valves illuminated by at least one of the first color light beam or the fluorescent light; and a region division element including first and second regions and disposed on an optical path between the fluorescent unit and the one or two light valves, the first region outputting the first color light beam and the fluorescent light from the fluorescent unit to be able to reach the one or two light valves, the second region outputting the fluorescent light from the fluorescent unit to be able to reach the one or two light valves.

An optical system of the disclosure includes: a fluorescent unit that includes a phosphor region excited by a first color light beam to output fluorescent light including at least one color light beam, and outputs the first color light beam in a first period and outputs the fluorescent light in a second period; one or two light valves illuminated by at least one of the first color light beam or the fluorescent light; and a region division element including first and second regions and disposed on an optical path between the fluorescent unit and the one or two light valves, the first region outputting the first color light beam and the fluorescent light from the fluorescent unit to be able to reach the one or two light valves, the second region outputting the fluorescent light from the fluorescent unit to be able to reach the one or two light valves.

A light conversion device is disclosed. The light conversion device includes a substrate and a wavelength conversion element (111). The wavelength conversion element (111) includes an inorganic binder, such as sodium silicate. Also disclosed are phosphor wheels and light engines including such phosphor wheels. Further disclosed are high-power laser projection display systems comprising a laser having a power of from about 60 W and about 300 W and a light conversion device. The use of an inorganic binder permits high thermal stability at reasonable cost.

An optical device is provided including a light-imaging component configured to focus light fed to the light-imaging component in at least one focusing spot, wherein the light fed includes at least one predefinable wavelength; and a conversion apparatus including at least one phosphor which is designed to convert light having the at least one predefinable wavelength into conversion light, wherein the conversion apparatus is arranged in such a way that the at least one phosphor is arranged in the focusing spot of the light-imaging component. The light-imaging component is configured to generate at least two focusing spots, and the conversion apparatus is arranged in such a way that the at least two focusing spots are positioned on the at least one phosphor.

A wavelength conversion module including a substrate, a wavelength conversion layer and at least one wing is provided. The substrate has a wavelength conversion area, a non-wavelength conversion area and at least one through hole. The through hole penetrates through the substrate and is located in the non-wavelength conversion area. The wavelength conversion layer is disposed in the wavelength conversion area of the substrate. The wing is disposed in the non-wavelength conversion area of the substrate. When the substrate reaches a first temperature range, the wing closes the through hole. When the substrate reaches a second temperature range, at least one airflow channel is formed between the wing and the through hole. The wavelength conversion module of the invention and the projection device using the same effectively reduce a temperature of the wavelength conversion module, and thus have better reliability.

Examples are disclosed that relate to a compact optical systems comprising SLMs. One example provides a projection system comprising an illumination stage including a light emitting diode (LED) array. The LED array comprises a plurality of red LEDs, a plurality of green LEDs, and a plurality of blue LEDs. The illumination stage further comprises an illumination stage optical system configured to control an angular extent of light emitted by the LED array and homogenize the light emitted by the LED array. The projection system further comprises an image forming stage configured to form an image from light output by the illumination stage, the image forming stage comprising a spatial light modulator (SLM) configured to spatially modulate the light output by the illumination stage to form an image, and one or more projection optics configured to project the image formed by the spatial light modulator.

An illumination system and a projection apparatus are provided. The illumination system includes an excitation light source, a light guiding element, a filter module, an optical wavelength conversion module, and a homogenizing element. The light guiding element reflects an excitation beam coming from the excitation light source. The filter module includes a filtering region and receives the excitation beam reflected by the light guiding element. The optical wavelength conversion module includes a wavelength conversion region, receives the excitation beam reflected by the filtering region and reflects a conversion beam converted from the excitation beam. The conversion beam forms at least one color beam after passing through the filtering region of the filter module. The homogenizing element receives the excitation beam coming from the filter module and the at least one color beam. An incident angle of the excitation beam on the light guiding element is θ1, and θ1>0°.

An illumination system and a projection apparatus are provided. The illumination system includes an excitation light source, a light guiding element, a filter module, an optical wavelength conversion module, and a homogenizing element. The light guiding element reflects an excitation beam coming from the excitation light source. The filter module includes a filtering region and receives the excitation beam reflected by the light guiding element. The optical wavelength conversion module includes a wavelength conversion region, receives the excitation beam reflected by the filtering region and reflects a conversion beam converted from the excitation beam. The conversion beam forms at least one color beam after passing through the filtering region of the filter module. The homogenizing element receives the excitation beam coming from the filter module and the at least one color beam. An incident angle of the excitation beam on the light guiding element is θ1, and θ1>0°.

A system includes: a phosphor configured to receive first light having a first color, to produce second light having a second color responsive to the first light, and to transmit at least a first portion of the first light; a color wheel comprising a first colored segment configured to transmit light having a third color and a second colored segment configured to transmit light having a fourth color; a light tunnel optically coupled between the phosphor and the color wheel configured to transmit combined light including least a portion of the first light and the second light; wherein the first segment is configured to transmit the third color as first transmitted light and the second segment to transmit light of the fourth color as second transmitted light; and a spatial light modulator configured to modulate the first transmitted light and the second transmitted light.

A projection device, including an illumination light source, an electrochromic module, at least one light valve, and a projection lens, is provided. The illumination light source provides an illumination beam. The electrochromic module is disposed on a transmission path of the illumination beam. The electrochromic module includes at least one electrochromic element, and sequentially maintains or changes a wavelength of the illumination beam penetrating the at least one electrochromic element. The at least one light valve is disposed on the transmission path of the illumination beam transmitted by the electrochromic module to convert the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam to project the image beam out of the projection device. The projection device and the use method thereof provided by the disclosure may change the color light output or the color space of a display image.