A wavelength conversion element configured to receive an excitation light beam includes: a substrate configured to rotate about a central axis including a wavelength conversion region and a non-wavelength conversion region; and at least one wavelength conversion layer. When the substrate is rotated about the central axis, the non-wavelength conversion region and the wavelength conversion region alternately enter a transmission path of the excitation light beam. The substrate has a recessed portion located inside or outside of and surrounding the wavelength conversion region. The recessed portion includes an inclined surface. When the excitation light beam is incident on the inclined surface, the inclined surface reflects the excitation light beam to the wavelength conversion layer, and the wavelength conversion layer converts the excitation light beam into a converted beam. When the excitation light beam is incident on the non-wavelength conversion region, the non-wavelength conversion region reflects the excitation light beam.

An apparatus for high dynamic range (HDR) modulation includes one or more lasers configured to transmit respective beams of laser light with a single color mode and a PLM optically coupled to the one or more lasers. The PLM is configured to modulate the laser light to produce a first modulated light. The apparatus also includes a phosphor optically coupled to the PLM and configured to receive at least a first portion of the first modulated light from the PLM and to emit a phosphor light with multiple color modes. At least one spatial light modulator (SLM) is also optically coupled to the phosphor and configured to modulate the multiple color modes in the phosphor light and the single color mode to project a second modulated light.

The invention provides an arrangement (1) comprising a device (1000), wherein the device (1000) comprises a luminescent material comprising element (100) and a light transmissive element (200), wherein: (a) the device (1000) has a first device axis (A1); (b) the luminescent material comprising element (100) comprises a luminescent material (110) configured to emit luminescent material light (111) upon irradiation with first light (11), wherein the luminescent material comprising element (100) has a first length (L1) and a characteristic first dimension (D1) perpendicular to the first length (L1), wherein D1/L1<1; wherein the luminescent material comprising element (100) is configured at a non-zero first distance (r1) from the first device axis (A1), and wherein the luminescent material comprising element (100) at least partly surrounds the first device axis (A1); (c) the light transmissive element (200) is transmissive for the first light (11), wherein the light transmissive element (200) comprises a element light entrance part (201 and an element light escape part (202), wherein the element light escape part (202) and the luminescent material (110) are radiationally coupled; wherein one or more of the following applies: (i) the first device axis (A1) intersects the light transmissive element (200), and (ii) the light transmissive element (200) at least partly surrounds the first device axis (A1); and (d) the luminescent material comprising element (100) is in thermal contact with one or more of (a) the light transmissive element (200) and (b) an optional thermally conductive element (300).

A luminophore having the general empirical formula X′.sub.1−xA′.sub.y(Al.sub.1+zA′.sub.3−z) O.sub.4:E′ that crystallizes in a tetragonal crystal system. X′ may be Mg, Ca, Sr, Ba, and combinations thereof; A′ may be Li, Na, K, Rb, Cs, and combinations thereof; E′ may be Eu, Ce, Yb, Mn, and combinations thereof; 0<x<0.25; y≤x; and z=0.5(2x−y).

A color wheel according to an embodiment of the present invention comprises: a basic fluorescent body having a basic light-emitting wavelength; and at least one modified fluorescent body having at least one light-emitting wavelength different from the basic light-emitting wavelength, wherein the basic fluorescent body comprises Y.sub.3Al.sub.5O.sub.12 and the modified fluorescent body comprises Y.sub.3(Ga.sub.xAl.sub.(1-x)).sub.5O.sub.12:Ce in which gallium is doped on the basic fluorescent body

A laser projection apparatus includes a laser source, a light modulating engine and a projection lens. The laser source includes a laser device, a combining component, a first lens and a phosphor wheel. The combining component includes a reflecting region and two transmitting regions. The reflecting region is configured to reflect a laser beam and a fluorescent beam incident on the reflecting region. The two transmitting regions are disposed on two sides of the reflecting region respectively, and the transmitting regions are configured to transmit a plurality of laser beams emitted by the laser device. The phosphor wheel includes a first region and a second region. The first region is configured to diffuse and reflect the laser beams incident on the first region. The second region is configured to be excited to emit a fluorescent beam due to irradiation of the laser beams incident on the second region.

A color wheel unit includes a color wheel assembly, a rod integrator, and a holder. The holder includes a first base attached to a housing of a projection display apparatus, a second base protruding from the first base, and a third base further protruding from the second base and to which the rod integrator is attached. The third base includes a first guide wall and a second guide wall that guide the color wheel assembly. The color wheel assembly includes the color wheel, a motor that rotationally drives the color wheel, and a support part that rotatably supports the color wheel. The support part includes a first restricting part whose movement is restricted and guided by the first guide wall, and a second restricting part whose movement is restricted and guided by the second guide wall when the color wheel assembly is attached to the holder.

A wheel including a substrate, a driving assembly, a fixing bracket, and a damper is provided. The driving assembly is disposed on the substrate to drive the substrate to rotate. The driving assembly and the damper are fixed onto the fixing bracket. The damper is disposed between the driving assembly and the fixing bracket, and the driving assembly is located between the substrate and the damper. The driving assembly has a first diameter, the damper has a second diameter, and the second diameter is greater than or equal to the first diameter. The wheel is disposed in a projector and may effectively reduce vibration and noise generated during the operation of the wheel, so as to mitigate a noise problem of the projector and increase a service life of the wheel.

A wavelength conversion element includes a substrate, a wavelength conversion layer and a heat dissipation member. The substrate has a supporting surface. The wavelength conversion layer is disposed on the supporting surface. The heat dissipation member is disposed on the supporting surface and is surrounded by the wavelength conversion layer. The heat dissipation member has a heat dissipation plate and a plurality of heat dissipation tooth portions. The heat dissipation plate is fixed on the supporting surface. The heat dissipation plate has an outer side surface. The outer side surface is perpendicular to the supporting surface. The heat dissipation tooth portions are respectively connected to the outer side surface. A projection device including the wavelength conversion element is also provided. The wavelength conversion element can improve wavelength conversion efficiency and reliability, and the projection device can improve image brightness and service life.

A light source apparatus includes a light source, a light collection optical system configured to collect a pencil of light emitted from the light source using multiple lenses, a microlens array formed into a size corresponding to a collected light diameter of a pencil of light collected by the light collection optical system and caused to be incident thereon from the light collection optical system, and a display device on to which light transmitted through the microlens array to be superimposed together is incident.