A light emitting device includes a substrate, a laminated structure provided to the substrate, and including a plurality of columnar parts, and an electrode disposed at an opposite side to the substrate of the laminated structure, wherein the columnar parts have a light emitting layer, the columnar parts are disposed between the electrode and the substrate, light generated in the light emitting layer propagates through the plurality of columnar parts to cause laser oscillation, and the electrode is provided with a hole.

Provided is a laser device, comprising a laser light source, a collimating lens that collimates the light output from the laser light source, and a diffuser plate that diffuses the light from the laser light source before collimating the light.

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 wavelength conversion module includes a ceramic substrate, a wavelength conversion layer, and a plurality of colloidal bosses. The ceramic substrate has a first surface. The wavelength conversion layer is disposed on the first surface of the ceramic substrate. The colloidal bosses are separately from each other disposed on the ceramic substrate and at least located on the first surface. The colloidal bosses and the wavelength conversion layer are separated from each other, and a heat resistant temperature of the colloidal bosses is higher than 500 degrees. The above wavelength conversion module has favorable heat dissipation effect.

A projection device comprises first light sources, an interference disk, a condensing lampshade, and a driving device. Both of the interference disk and the condensing lampshade are arranged on light paths of the first light sources. The condensing lampshade is arranged behind the interference disk, and the interference disk is made stationary relative to the first light sources. The driving device drives the condensing lampshade to rotate. When the driving device drives the condensing lampshade to rotate, the projection light emitted after sequentially passing through the interference disk and the condensing lampshade projects an effect of clouds moving. The light paths of the projection light emitted by the first light sources are relatively stable after passing through the interference disk and before entering the condensing lampshade.

A projection device comprises first light sources, an interference disk, a condensing lampshade, and a driving device. Both of the interference disk and the condensing lampshade are arranged on light paths of the first light sources. The condensing lampshade is arranged behind the interference disk, and the interference disk is made stationary relative to the first light sources. The driving device drives the condensing lampshade to rotate. When the driving device drives the condensing lampshade to rotate, the projection light emitted after sequentially passing through the interference disk and the condensing lampshade projects an effect of clouds moving. The light paths of the projection light emitted by the first light sources are relatively stable after passing through the interference disk and before entering the condensing lampshade.

Disclosed is an integrated projection and illumination device. The integrated projection and illumination device includes a lamp housing, a mounting assembly, an illumination assembly and a projection assembly; and the mounting assembly includes a mounting disc, a mounting ring and clamping blocks, elastic members being arranged between the clamping blocks and the mounting ring, the mounting disc being provided with top surface connectors and an outer limiting edge, the outer limiting edge being capable of being clamped on the clamping blocks protruding out of the inner wall of the mounting ring, the mounting disc being further provided with pressing blocks, and the pressing blocks rotating along with the mounting disc and being capable of making contact with the clamping blocks and pressing the clamping blocks into the mounting ring during rotation. The present disclosure can be used for illumination and projection, and further features convenient dismounting and mounting.

A wavelength conversion module, including a first substrate, a second substrate, a counterweight ring, a first wavelength conversion layer, and a second wavelength conversion layer, is provided. The first substrate has a first upper surface. The second substrate has a second upper surface. The counterweight ring is disposed on the first upper surface of the first substrate and the second upper surface of the second substrate to connect the first substrate to the second substrate. The first wavelength conversion layer is disposed on the first upper surface of the first substrate and located around the counterweight ring. The second wavelength conversion layer is disposed on the second upper surface of the second substrate and located around the counterweight ring. A wavelength of a first excited beam emitted by the first wavelength conversion layer is greater than a wavelength of a second excited beam emitted by the second wavelength conversion layer.

A beam splitting element as provided includes an optical substrate and a diffuse reflection layer. The optical substrate is configured to reflect or allow the incident beam to pass through. The diffuse reflection layer is disposed on a portion of a surface of the optical substrate. The incident beam is split into first and second split beams through the beam splitting element and satisfies one of the following conditions: field angles of the first and second split beams exit from the beam splitting element are different; the field angles of the first and second split beams exit from the beam splitting element are the same, and exit directions of the first and second split beams are parallel to each other. A projection device having the beam splitting element is also provided.

A laser source assembly is provided. The laser source assembly includes a plurality of lasers, a light combining assembly and a fly-eye lens. The fly-eye lens is disposed on a light exit side of the light combining assembly, and is configured to homogenize laser beams. The fly-eye lens includes a plurality of first microlenses located on a light incident surface thereof and a plurality of second microlenses located on a light exit surface thereof. A sine value of a divergence angle of a laser beam in a fast axis direction is greater than a sine value of an aperture angle of a first microlens in a slow axis direction, and a sine value of a divergence angle of the laser beam in the slow axis direction is greater than a sine value of an aperture angle of the first microlens in the fast axis direction.