Abstract: A composite color wheel module includes a substrate, a wavelength conversion layer, and a wavelength selection layer. The substrate includes a wavelength conversion region and a wavelength selection region. A material of the substrate is selected from at least one of nitrogen alumina, magnesium oxide, magnesium aluminum spinel, yttrium aluminum garnet, aluminum nitride, beryllium oxide, yttrium oxide, yttrium zirconium dioxide, gallium arsenide, zinc sulfide, zinc selenide, magnesium fluoride, and calcium fluoride. The wavelength conversion layer is arranged in the wavelength conversion region. The wavelength selection layer is arranged in the wavelength selection region. A surface of the wavelength selection region has a first surface roughness less than 0.02 um. The disclosure further provides a projection device including the composite color wheel module.

Abstract: A wavelength conversion element is provided. The wavelength conversion element includes a substrate, a wavelength conversion layer, a reflective layer, and a heat conductive layer. The wavelength conversion layer is disposed on the substrate. The reflective layer is disposed on the substrate and is located between the substrate and the wavelength conversion layer. The heat conductive layer is disposed on the substrate, and at least a portion of the heat conductive layer is located between the substrate and the reflective layer. A projector is also provided, and the projector includes the wavelength conversion element. The wavelength conversion element exhibits a favorable heat dissipation effect and provides improved conversion efficiency, so that the projector exhibits favorable projection quality and product competitiveness.

Abstract: A wheel manufacturing method, a wheel, and a projection apparatus are provided. The wheel manufacturing method includes the following. First, a substrate is provided. Next, a thermal conductivity film is formed on at least one surface of the substrate; the thermal conductivity film is formed by using cold spray or supersonic laser deposition to contact multiple thermally conductive particles with the substrate, the thermally conductive particles in the thermal conductivity film occupy >95% of a volume of the thermal conductivity film, and the thermal conductivity film has a void rate of <1%. Next, an optical layer is formed on the substrate or the thermal conductivity film. The wheel, the manufacturing method thereof, and the projection apparatus including the wheel provided by the invention have good thermal conductivity.

Abstract: A wavelength conversion module includes a substrate and a wavelength conversion layer. The substrate has a first surface and a second surface opposite to each other, and at least one through hole penetrating the substrate and connecting the first surface and the second surface. The wavelength conversion layer is disposed on the first surface of the substrate and covers the through hole. The orthographic projection of the wavelength conversion layer on the substrate overlaps the through hole. A projector including the wavelength conversion module is also provided.

Abstract: A wavelength conversion element is provided. The wavelength conversion element includes a substrate, a wavelength conversion layer, a reflective layer, and a heat conductive layer. The wavelength conversion layer is disposed on the substrate. The reflective layer is disposed on the substrate and is located between the substrate and the wavelength conversion layer. The heat conductive layer is disposed on the substrate, and at least a portion of the heat conductive layer is located between the substrate and the reflective layer. A projector is also provided, and the projector includes the wavelength conversion element. The wavelength conversion element exhibits a favorable heat dissipation effect and provides improved conversion efficiency, so that the projector exhibits favorable projection quality and product competitiveness.