A light source device includes: a first light source configured to emit first light including a white wavelength band or one or more wavelength bands of at least red, green, and blue; a second light source configured to emit second light including a specific wavelength band included in the first light; a first detector configured to detect an amount of the light of the specific wavelength band in the first light; a first optical member configured to multiplex light of a wavelength band different from the specific wavelength band in the first light, and the second light; and a processor configured to control the first light source based on a detection result of the first detector.

A fluorescent color wheel includes a substrate, a phosphor layer, and a fan blade structure. The substrate has a front surface, a rear surface opposite to the front surface, and a plurality of through holes communicating the front surface and the rear surface. The phosphor layer is disposed on the front surface. The fan blade structure includes a heat-dissipating plate and a plurality of first fan blades. The heat-dissipating plate has a first surface attached to the rear surface of the substrate. The first fan blades are disposed on the first surface and respectively pass through the through holes to protrude out from the front surface of the substrate.

A light source device includes a first light source configured to emit first color light, a wavelength conversion element configured to convert a wavelength of excitation light made incident thereon and emit converted light having a wavelength larger than the wavelength of the excitation light, and an emission-position changing mechanism configured to change an emission position of the incident excitation light to thereby change an incident position of the excitation light on the wavelength conversion element and change an emission position of the first color light and an emission position of the converted light in the same direction in synchronization with each other.

A laser projector includes a laser source, a first dichroic mirror, a wavelength conversion module, a second dichroic mirror, a first, a second and a third light valves and a beam combiner. The laser source is for providing a blue beam including a first portion and a second portion. The first dichroic mirror is for receiving and allowing the blue beam to penetrate. The wavelength conversion module is for receiving the first portion and emitting a yellow beam to the first dichroic mirror. The second dichroic mirror is for receiving and separating the yellow beam reflected by the first dichroic mirror into a green and a red beam. The first, second and third light valve are for receiving and modulating respectively the second portion of the blue beam, the green beam and the red beam. The beam combiner is for the beams to form a multi-color image.

In a display device, when blue (B) light enters a first liquid crystal panel, radiated light radiated from the first liquid crystal panel contains red (R) phosphorescence having a wavelength range longer than blue (B) light due to a deterioration of a liquid crystal material. Thus, in the display device, an optical sensor device is provided behind a mirror comprised of a dichroic mirror to monitor or the like the service life of the first liquid crystal panel on the basis of a result of reception, at the optical sensor device, of light having a frequency band ranging from 600 nm to 650 nm, and makes notification of the result. Furthermore, on the basis of a result from the optical sensor device, an electrode used to suck impurities provided at the first liquid crystal panel is driven to sweep ionic impurities from a display region.

Provided is a particulate phosphor including a single crystal having a composition represented by a compositional formula (Y.sub.1-x-y-zLu.sub.xGd.sub.yCe.sub.z).sub.3+aAl.sub.5−aO.sub.12 (0≤x≤0.9994, 0≤y≤0.0669, 0.001≤z≤0.004, −0.016≤a≤0.315) and a particle diameter (D50) of not less than 20 μm. Also provided is a light-emitting device including a phosphor-including member that includes the phosphor and a sealing member including a transparent inorganic material sealing the phosphor or a binder including an inorganic material binding particles of the phosphor, and a light-emitting element that emits a blue light for exciting the phosphor.

A projection light source system includes a laser light source, a fluorescence wheel, a color wheel, and a light guide assembly. The fluorescence wheel includes a yellow fluorescence area, a green fluorescence area, and a blue fluorescence area. The yellow fluorescence area, the green fluorescence area, and the blue fluorescence area are configured to receive excitation light in time sharing, and generate fluorescence of different colors according to the excitation light. The yellow fluorescence area is configured to generate yellow fluorescence, the green fluorescence area is configured to generate green fluorescence, and the blue fluorescence area is configured to generate blue fluorescence. The color wheel is configured to receive the fluorescence and output red light, green light, and blue light in sequence to form light in three basic colors. The light guide assembly is located on a light path of the excitation light and the fluorescence.

A wavelength conversion device according to the present disclosure includes a wheel substrate, a phosphor layer formed on the wheel substrate, and a cooling fin unit disposed on the wheel substrate. The cooling fin unit has a base part to be bonded to the wheel substrate. A surface of the wheel substrate includes a first area corresponding to the phosphor layer, and a second area located closer to the central axis than the first area, the surface of the wheel substrate and a surface at the wheel substrate side of the base part are separated from each other to form a space between the wheel substrate and the base part, and a coupling part configured to thermally couple the surface of the wheel substrate and the surface at the wheel substrate side of the base part is disposed in at least the second area of the second surface.

The disclosure provides a projection device with a wavelength conversion module including a ceramic substrate, a ceramic intermediate layer, a ceramic reflection layer, and a wavelength conversion layer. The ceramic reflection layer is disposed on the ceramic intermediate layer disposed on the ceramic substrate. The thermal expansion coefficient of the ceramic intermediate layer ranges from the thermal expansion coefficient of the ceramic substrate and the thermal expansion coefficient of the ceramic reflection layer. The wavelength conversion layer is disposed on the ceramic reflection layer. With the wavelength conversion module and the projection device, separation or gaps between the ceramic substrate and the ceramic reflection layer caused by a significant difference of the thermal expansion coefficients is prevented, the adhesion between the ceramic substrate and the ceramic reflection layer is further improved, the service life and the structural reliability of the wavelength conversion module are improved.

A light source module including first and second light sources, first and second wavelength conversion units, first and second light-splitting units is provided. The first light source emits a first light having a first wavelength. The first wavelength conversion unit converts at least one portion of the first light into a first converted light having a second wavelength. The second light-splitting unit allows the light having the first wavelength to travel through and reflects the light having the second wavelength. The second light source emits a second light having the first wavelength. The second wavelength conversion unit converts at least one portion of the second light into a second converted light having the second wavelength. The first light-splitting unit disposed between the first and the second wavelength conversion units reflects the light having the first wavelength and allow the light having the second wavelength to travel through.