CN217007948U

CN217007948U - Laser projection device

Info

Publication number: CN217007948U
Application number: CN202220698155.7U
Authority: CN
Inventors: 王强; 李巍
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-07-19
Anticipated expiration: 2032-03-28

Abstract

The application discloses laser projection equipment belongs to laser projection display field. The first light transmission component in the laser projection device can transmit the blue laser to the fluorescent wheel component and transmit the fluorescent light of at least one color emitted by the fluorescent wheel component to the second light transmission component. The second light transmission component is used for transmitting the blue laser and the fluorescence of at least one color to the light valve and the projection lens and projecting the blue laser and the fluorescence of at least one color to the projection screen through the projection lens. The blue laser can be transmitted to the fluorescent light path assembly through the two light transmission assemblies, and the blue laser and the fluorescent light with at least one color are transmitted to the light valve and the projection lens, so that the structure of the laser projection equipment is simplified, and the cost of the laser projection equipment is reduced.

Description

Laser projection device

Technical Field

The disclosure relates to the field of laser projection display, in particular to a laser projection device.

Background

Laser projection equipment such as an ultra-short-focus laser television is widely applied to the display field because of the advantages of high color purity, large color gamut, high brightness and the like.

A laser projection device generally includes a laser, a polarizing wheel, an orientation adjustment assembly, a fluorescent wheel, and a projection assembly. The laser is used for emitting blue laser with the polarization direction being the first direction. The polarizing wheel includes a first region for transmitting blue laser light emitted from the laser to the fluorescent wheel and a second region. The fluorescent wheel generates fluorescence under the excitation of the blue laser, and reflects the fluorescence to the first area, and then the first area reflects the fluorescence to the projection assembly. The second area reflects blue laser emitted by the laser to the direction adjusting assembly, the direction adjusting assembly adjusts the polarization direction of the blue laser from the first direction to the second direction and transmits the adjusted blue laser to the second area, and the second area transmits the adjusted blue laser to the projection assembly. And finally, the projection assembly projects the fluorescent light and the adjusted blue laser to a projection screen to realize the display of a projection picture.

However, the structure of the laser projection apparatus in the related art is complicated.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a laser projection device, which can solve the problem that the structure of the laser projection device is complex in the related art. The technical scheme is as follows:

in one aspect, a laser projection apparatus is provided, the laser projection apparatus including: the device comprises a laser, a first light transmission component, a fluorescent wheel component, a second light transmission component, a light valve and a projection lens; the first optical transmission assembly and the second optical transmission assembly are both positioned on the light emitting side of the laser;

the laser is used for emitting blue laser to the first optical transmission assembly and the second optical transmission assembly respectively;

the first light transmission assembly is used for transmitting the blue laser to the fluorescent wheel assembly;

the fluorescent wheel component is used for emitting fluorescent light of at least one color under the excitation of the blue laser;

the first light transmitting component is also used for transmitting the fluorescence of at least one color to the second light transmitting component;

the second light transmission component is used for transmitting the blue laser and the fluorescence of the at least one color to the light valve;

the light valve is used for modulating the blue laser and the fluorescence of at least one color into an image light beam and transmitting the image light beam to the projection lens;

the projection lens is used for projecting the image light beam to a projection screen.

Optionally, the second optical transmission assembly includes: the first reflector group and the first dichroic filter;

the first reflector group is positioned on the light emergent side of the laser and used for reflecting the blue laser to the first dichroic filter;

the first light transmission component is used for transmitting the fluorescence of at least one color to the first dichroic filter;

the first dichroic filter is used for transmitting the blue laser to the light valve and reflecting the fluorescence of the at least one color to the light valve; alternatively, the blue laser light is reflected to the light valve and the at least one color of fluorescent light is transmitted to the light valve.

Optionally, the first mirror group includes: the first reflector and the second reflector are oppositely arranged;

the first reflector is positioned on the light-emitting side of the laser and used for reflecting the blue laser to the second reflector;

the second reflector is used for reflecting the blue laser to the first dichroic filter.

Optionally, the fluorescent wheel assembly comprises: a first fluorescent wheel;

the first fluorescent wheel comprises a first excitation region and a second excitation region, the first excitation region is used for emitting fluorescent light of a first color under the excitation of the blue laser, and the second excitation region is used for emitting fluorescent light of a second color under the excitation of the blue laser;

or the first fluorescent wheel is used for emitting fluorescent light of a third color under the excitation of the blue laser;

wherein the first color, the second color, and the third color are different from each other.

Optionally, the first optical transmission component includes: a second dichroic plate between a light exit side of the laser and the first phosphor wheel, the second dichroic plate to transmit the blue laser light to the first phosphor wheel and reflect the at least one color phosphor light to the second light transmitting assembly.

Optionally, the first optical transmission assembly further includes: a first lens;

the first lens is located between the second dichroic sheet and the first fluorescent wheel, and the first lens is used for condensing the blue laser light transmitted by the second dichroic sheet and transmitting the blue laser light to the first fluorescent wheel.

Optionally, the fluorescent wheel assembly comprises: a second fluorescent wheel and a third fluorescent wheel;

the first light transmission component is used for transmitting the blue laser light to the second fluorescence wheel and the third fluorescence wheel respectively;

the second fluorescent wheel is used for emitting fluorescent light of a first color under the excitation of the blue laser;

the third fluorescent wheel is used for emitting fluorescent light of a second color under the excitation of the blue laser.

Optionally, the first optical transmission assembly includes: a third dichroic plate and a fourth dichroic plate;

the third dichroic sheet is positioned between the light emitting side of the laser and the second fluorescent wheel, and is used for transmitting the blue laser light to the second fluorescent wheel and reflecting the fluorescent light of the first color to the second light transmission component;

the fourth dichroic sheet is positioned between the light emitting side of the laser and the third fluorescent wheel, and is used for transmitting the blue laser light to the third fluorescent wheel and reflecting the fluorescent light of the second color to the third dichroic sheet;

the third dichroic filter is also for transmitting the fluorescent light of the second color to the second light transmitting component.

Optionally, the first optical transmission assembly further includes: a second lens and a third lens;

the second lens is positioned between the third dichroic sheet and the second fluorescent wheel and is used for condensing the blue laser transmitted by the third dichroic sheet and transmitting the condensed blue laser to the second fluorescent wheel;

the third lens is located between the fourth dichroic filter and the third fluorescent wheel, and is used for condensing the blue laser transmitted by the fourth dichroic filter and transmitting the blue laser to the third fluorescent light.

Optionally, the first optical transmission assembly further includes: a second mirror group;

the second mirror group is located between the light emitting side of the laser and the fourth dichroic sheet and used for reflecting the blue laser to the fourth dichroic sheet.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the embodiment of the disclosure provides a laser projection device, wherein a first light transmission component in the laser projection device can transmit blue laser to a fluorescent wheel component and transmit fluorescence of at least one color emitted by the fluorescent wheel component to a second light transmission component. The second light transmission component is used for transmitting the blue laser and the fluorescence of at least one color to the light valve and the projection lens and projecting the blue laser and the fluorescence of at least one color to the projection screen through the projection lens. The blue laser can be transmitted to the fluorescent light path assembly through the two light transmission assemblies, and the blue laser and the fluorescent light with at least one color are transmitted to the light valve and the projection lens, so that the structure of the laser projection equipment is simplified, and the cost of the laser projection equipment is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a laser projection apparatus provided in the related art;

fig. 2 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of another laser projection apparatus provided in the embodiments of the present disclosure;

fig. 4 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another laser projection apparatus provided in an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a laser projection apparatus provided in the related art, and as shown in fig. 1, the laser projection apparatus may generally include a laser 100, a polarizing wheel 200, an orientation adjustment assembly 300, a fluorescent wheel 400, and a projection assembly 500.

The laser 100 is configured to emit blue laser light with a first polarization direction. The polarization wheel 200 includes a first region for transmitting the blue laser light emitted from the laser 100 to the fluorescent wheel 400, and a second region. The fluorescent wheel 400 generates fluorescence under the excitation of the blue laser, and reflects the fluorescence to a first region, which in turn reflects the fluorescence to the projection assembly 500. The second region reflects the blue laser emitted from the laser 100 to the direction adjustment assembly 300, the direction adjustment assembly 300 adjusts the polarization direction of the blue laser from the first direction to the second direction, and transmits the adjusted blue laser to the second region, and the second region transmits the adjusted blue laser to the projection assembly 500. Finally, the projection module 500 modulates the fluorescent light and the adjusted blue laser light into an image beam, and projects the image beam to a projection screen to realize the display of a projection picture.

Referring to fig. 1, the orientation adjustment assembly 300 can include a slide 3001 and a mirror 3002, wherein the slide 3001 is a quarter-slide. The second region reflects the blue laser beam emitted from the laser 100 to the slide 3001, the slide 3001 adjusts the polarization direction of the blue laser beam from the first direction to the third direction, and transmits the adjusted blue laser beam to the mirror 3002. Thereafter, the mirror 3002 reflects the adjusted blue laser light to the slide glass 3001 again. The slide 3001 adjusts the polarization direction of the adjusted blue laser light from the third direction to the second direction again, and transmits the adjusted blue laser light to the second region, which then transmits the adjusted blue laser light to the projection group 500.

Referring to fig. 1, the laser projection apparatus may further include: three lenses, namely a lens 600, a lens 700 and a lens 800, are provided, and the lens 600 is located on the light-emitting side of the laser 100 and is used for transmitting the blue laser light emitted by the laser to the lens 700. The lens 700 is used to transmit the blue laser light to the polarizing wheel 200, a first region of the polarizing wheel 200 is used to transmit the blue laser light to the lens 800, and the lens 800 is used to transmit the blue laser light to the fluorescent wheel and transmit the fluorescent light to the first region.

However, since the laser projection apparatus needs to be provided with the polarizing wheel and the direction adjustment assembly, the structure of the laser projection apparatus is complicated, and the cost of the laser projection apparatus is high. Moreover, since the polarizing wheel can only transmit the blue laser emitted by the laser to the fluorescent wheel or transmit the blue laser emitted by the laser to the direction adjusting assembly at the same time, and the received blue laser cannot be transmitted to the fluorescent wheel and the direction adjusting assembly at the same time, the efficiency of projecting the image beam to the projection screen is low.

Fig. 2 is a schematic structural diagram of a laser projection apparatus provided in an embodiment of the present disclosure, and as shown in fig. 1, the laser projection apparatus may include a laser 10, a first light transmission assembly 20, a fluorescent wheel assembly 30, a second light transmission assembly 40, a light valve 50, and a projection lens 60. Wherein, the first light transmission component 20 and the second light transmission component 40 are both located at the light emitting side of the laser 10.

The laser 10 is used to emit blue laser light to the first optical transmission assembly 20 and the second optical transmission assembly 40, respectively. Since the first optical transmission assembly 20 and the second optical transmission assembly 40 are both located on the light emitting side of the laser 10, the blue laser emitted from the laser 10 can be projected to the first optical transmission assembly 20 and the second optical transmission assembly at the same time, and the ratio of the blue laser projected from the laser 10 to the first optical transmission assembly 20 and the second optical transmission assembly 40 is determined by the positions of the first optical transmission assembly 20 and the second optical transmission assembly 40 on the light emitting side of the laser 10. Alternatively, the wavelength of the blue laser may be a short wavelength.

For example, referring to fig. 2, it is assumed that the laser 10 emits five blue laser beams, three laser beams of the five laser beams are emitted to the first optical transmission assembly 20, and two laser beams of the five laser beams are emitted to the second optical transmission assembly 40.

The first light transmission assembly 20 is used for transmitting the blue laser light to the fluorescent wheel assembly 30, and the fluorescent wheel assembly 30 is used for emitting fluorescent light of at least one color under the excitation of the blue laser light. Wherein the at least one color may include a first color, a second color, and a third color, the first color, the second color, and the third color being different from each other. For example, the first color may be red, the second color may be green, and the third color may be yellow.

Optionally, the fluorescent wheel assembly 30 is configured to emit fluorescent light of the first color and the second color upon excitation by a blue laser. Or the fluorescent wheel assembly 30 is used to emit fluorescent light of a third color under excitation by a blue laser.

The first light transmitting assembly 20 is further configured to transmit the at least one color of fluorescent light to the second light transmitting assembly 40, and the second light transmitting assembly 40 is configured to transmit the blue laser light and the at least one color of fluorescent light to the light valve 50. Wherein the blue laser and the red and green fluorescence may be mixed as white light, or the blue laser and the yellow fluorescence may be mixed as white light.

In the disclosed embodiment, the first light transmitting assembly 20 is further configured to transmit the first color and the second color fluorescent light to the second light transmitting assembly 40, and the second light transmitting assembly 40 is configured to transmit the blue laser light, the first color and the second color fluorescent light to the light valve 50. Alternatively, the first light transmission assembly 20 is further configured to transmit the fluorescent light of the third color to the second light transmission assembly 40, and the second light transmission assembly 40 is configured to transmit the blue laser light and the fluorescent light of the third color to the light valve 50.

The light valve 50 is configured to modulate the blue laser and the fluorescent light with at least one color into an image beam, and transmit the image beam to the projection lens 60, and the projection lens 60 is configured to project the image beam onto a projection screen, so as to project a projection image onto the projection screen.

In the disclosed embodiment, the light valve 50 is used to modulate the blue laser light, the first color and the second color fluorescent light into an image beam. Or the light valve 50 is used to modulate the blue laser and the third color fluorescence into an image beam.

In summary, the embodiments of the present disclosure provide a laser projection apparatus, in which a first light transmission assembly is capable of transmitting blue laser light to a fluorescent wheel assembly, and transmitting at least one color of fluorescent light emitted from the fluorescent wheel assembly to a second light transmission assembly. The second light transmission component is used for transmitting the blue laser and the fluorescence of at least one color to the light valve and the projection lens and projecting the blue laser and the fluorescence of at least one color to the projection screen through the projection lens. The blue laser can be transmitted to the fluorescent light path assembly through the two light transmission assemblies, and the blue laser and the fluorescent light with at least one color are transmitted to the light valve and the projection lens, so that the structure of the laser projection equipment is simplified, and the cost of the laser projection equipment is reduced.

Moreover, since the blue laser emitted from the laser 10 can be emitted to the first light transmission assembly 20 and the second light transmission assembly at the same time, the efficiency of projecting the image beam to the projection screen is effectively improved.

Referring to fig. 3, 4, 5 and 6, the second light transmission assembly 40 may include a first mirror group 401 and a first dichroic filter 402.

The first reflector group 401 is located at the light emitting side of the laser 10, the laser 10 is configured to emit blue laser to the first reflector group 401, and the first reflector group 401 is configured to reflect the blue laser to the first dichroic filter 402.

The first light transmitting component 20 is used for transmitting at least one color of fluorescent light to the first dichroic filter 402. Referring to fig. 3 and 5, the first dichroic filter 402 is used for transmitting the blue laser light to the light valve 50 and reflecting the fluorescence of the at least one color to the light valve 50. Optionally, the first dichroic filter 402 is used to transmit the blue laser light to the light valve 50 and reflect the fluorescent light of the first and second colors to the light valve 50. Alternatively, the first dichroic filter 402 is used to transmit the blue laser light to the light valve 50 and reflect the third color fluorescence light to the light valve 50.

Alternatively, referring to fig. 4 and 6, the first dichroic filter 402 is used to reflect the blue laser light to the light valve 50 and transmit the at least one color of fluorescence light to the light valve 50. Optionally, the first dichroic filter 402 is used to reflect the blue laser light to the light valve 50 and transmit the first color and the second color fluorescence to the light valve 50. Alternatively, the first dichroic filter 402 is used to reflect the blue laser light to the light valve 50 and transmit the third color fluorescence to the light valve 50.

Optionally, the first mirror group 401 may include a plurality of mirrors. Referring to fig. 3, 4, 5 and 6, the first mirror group 401 may include a first mirror 4011 and a second mirror 4012 that are oppositely disposed. The first reflecting mirror 4011 is located on a light emitting side of the laser 10, the laser 10 is configured to emit blue laser to the first reflecting mirror 4011, the first reflecting mirror 4011 is configured to reflect the blue laser to the second reflecting mirror, and the second reflecting mirror is configured to reflect the blue laser to the first dichroic filter 402.

In an alternative implementation of the disclosed embodiment, referring to fig. 3 and 4, the fluorescent wheel assembly 3030 can include a first fluorescent wheel 301.

As an alternative implementation of the embodiment of the present disclosure, the first fluorescence wheel 301 may include a first excitation region and a second excitation region. The first excitation region is used for emitting the fluorescence of the first color under the excitation of the blue laser, and the second excitation region is used for emitting the fluorescence of the second color under the excitation of the blue laser.

In the disclosed embodiment, there may or may not be an overlapping region between the first excitation region and the second excitation region. The first excitation region may generate first color fluorescence under excitation of the blue laser light, and reflect the first color fluorescence to the first light transmission member 20. The second laser region may generate fluorescence of a second color under excitation of the blue laser light and reflect the fluorescence of the second color to the first light transmitting member 20.

Optionally, the first excitation area may be coated with a phosphor of a first color, or other phosphor containing a first color band, for example, the first excitation area may be coated with a red phosphor, or other phosphor containing a red color band. The second excitation area may be coated with a phosphor of a second color, or other phosphor containing a first color band, for example, the second excitation area may be coated with a green phosphor, or contain a green band phosphor.

The substrate of the first excitation region and the second excitation region may be a reflective substrate, for example, an aluminum substrate. The first excitation region generates fluorescence of a first color under the excitation of the blue laser, and the fluorescence is reflected to the first light transmission component 20 through the reflective substrate. The second excitation region generates a second color fluorescence under the excitation of the blue laser, and the second color fluorescence is reflected to the first light transmission component 20 through the reflective substrate.

As another optional implementation manner of the embodiment of the present disclosure, the first fluorescent wheel 301 is configured to emit fluorescent light of a third color under excitation of blue laser light.

Alternatively, the first fluorescent wheel 301 may generate fluorescent light of a third color under excitation of blue laser light and reflect the fluorescent light of the third color to the first light transmitting assembly 20.

The first fluorescent wheel 301 may be coated with a phosphor of a third color, or other phosphor containing a third band of colors, for example, the third excitation region may be coated with a yellow phosphor, or other phosphor containing a yellow band. The substrate of the first fluorescent wheel 301 may be a reflective substrate. The first fluorescent wheel 301 generates fluorescent light of a first color under the excitation of the blue laser light, and the fluorescent light is reflected to the first light transmission component 20 through the reflective substrate thereof.

In the embodiment of the present disclosure, the first fluorescent wheel 301 may be a fixed fluorescent wheel, that is, the first fluorescent wheel 301 does not need to rotate during the blue laser light emitted from the laser 10. And a fixed fluorescent wheel is adopted, so that the structure of the laser projection equipment is effectively simplified. Alternatively, the first fluorescent wheel 301 may be a rotating fluorescent wheel, i.e. the first fluorescent wheel 301 needs to rotate continuously during the blue laser light emitted from the laser 10.

Referring to fig. 3 and 4, the first light transfer component 20 may include a second dichroic plate 201, the second dichroic plate 201 being located between the light exit side of the laser 10 and the first fluorescent wheel 301. The laser 10 is configured to emit blue laser light to the second dichroic plate 201, and the second dichroic plate 201 is configured to transmit the blue laser light to the first fluorescence wheel 301 and reflect fluorescence of at least one color to the second light transmission member 40.

The first excitation region of the first fluorescence wheel 301 generates fluorescence of the first color under excitation of the blue laser light, and is reflected to the second dichroic plate 201 via its reflective substrate. The second excitation region generates fluorescence of a second color under excitation of the blue laser light, and reflects the fluorescence to the second dichroic sheet 201 through its reflective substrate. The second dichroic filter 201 is used to reflect the fluorescent light of the first and second colors to the first dichroic filter 402.

Alternatively, the first fluorescent wheel 301 generates fluorescent light of the third color under excitation of the blue laser light, and reflects the fluorescent light of the third color to the second dichroic plate 201 through the reflective substrate thereof, and the second dichroic plate 201 is configured to reflect the fluorescent light of the third color to the first dichroic plate 402.

In the embodiment of the present disclosure, an angle between the reflective surface of the first dichroic filter 402 and an optical axis of the blue laser light transmitted by the laser 10 to the first light transmission component 20 may be 45 degrees. An angle between the reflective surface of the second dichroic plate 201 and the optical axis of the blue laser light transmitted by the laser 10 to the first light transmission component 20 may be 45 degrees. Also, an angle between an optical axis of the blue laser light transmitted from the second dichroic filter 201 to the first fluorescent wheel 301 and an optical axis of the fluorescent light transmitted from the second dichroic filter 201 to the first dichroic filter 402 may be 90 degrees.

Referring to fig. 3 and 4, the first optical transmission assembly 20 may further include a first lens 202, and optionally, the first lens 202 may be a convex lens. The first lens 202 is located between the second dichroic filter 201 and the first fluorescent wheel 301. The first lens 202 is configured to condense the blue laser light transmitted by the second dichroic plate 201 and transmit the condensed blue laser light to the first fluorescent wheel 301, and transmit the fluorescent light of at least one color emitted from the first fluorescent wheel 301 to the second dichroic plate 202.

In this implementation, the position of the first reflecting mirror 4011 on the light emitting side of the laser 10 determines the ratio of the blue laser light transmitted by the laser 10 to the first reflecting mirror 4011 and the first light transmitting assembly 20. An angle between the reflecting surface of the first reflecting mirror 4011 and the optical axis of the blue laser beam transmitted from the laser 10 to the first optical transmission component 20 may be 45 degrees, and an angle between the reflecting surface of the second reflecting mirror 4012 and the optical axis of the blue laser beam transmitted from the laser 10 to the first optical transmission component 20 may be 45 degrees.

In another alternative implementation of the disclosed embodiment, referring to fig. 5 and 6, the fluorescent wheel assembly 30 may include a secondary fluorescent wheel 302 and a tertiary fluorescent wheel 303.

The first light transmission assembly 20 is configured to transmit the blue laser light to a second fluorescent wheel 302 and a third fluorescent wheel 303, respectively, wherein the second fluorescent wheel 302 is configured to emit fluorescent light of a first color under excitation of the blue laser light, and the third fluorescent wheel 303 is configured to emit fluorescent light of a second color under excitation of the blue laser light.

In the embodiment of the present disclosure, the second fluorescent wheel 302 is used for generating the fluorescent light of the first color under the excitation of the blue laser light, and reflecting the fluorescent light of the first color to the first light transmission component 20. The third fluorescent wheel 303 is used for generating fluorescent light of a second color under the excitation of the blue laser light and reflecting the fluorescent light of the second color to the first light transmission component 20.

In the disclosed embodiment, the second fluorescent wheel 302 may be coated with a first color phosphor or a first band of colors, for example, the second fluorescent wheel 302 may be coated with a red phosphor or other red band containing phosphors. The third fluorescent wheel 303 may be coated with a phosphor of a second color or contain a phosphor of a second colorband, for example, the third fluorescent wheel 303 may be coated with a green phosphor or contain a phosphor of a green colorband. The second fluorescent wheel 302 and the third fluorescent wheel 303 are both provided with a reflective substrate, and the second fluorescent wheel 302 generates fluorescent light of the first color under the excitation of the blue laser light and reflects the fluorescent light to the first light transmission component 20 through the reflective substrate. The third fluorescent wheel 303 generates fluorescent light of the second color under the excitation of the blue laser light, and reflects the fluorescent light to the first light transmission component 20 through the reflective substrate thereof.

Referring to fig. 5, the first light transmission assembly 20 may include a third dichroic plate 203 and a fourth dichroic plate 204.

The third dichroic plate 203 is located between the light exit side of the laser 10 and the second fluorescent wheel 302, the laser 10 is configured to emit blue laser light to the third dichroic plate 203, the third dichroic plate 203 is configured to transmit the blue laser light to the second fluorescent wheel 302, and reflect the fluorescent light of the first color to the second light transmitting member 40.

The fourth dichroic plate 204 is located between the light exit side of the laser 10 and the third fluorescent wheel 303, the laser 10 is configured to emit blue laser light to the fourth dichroic plate 204, the fourth dichroic plate 204 is configured to transmit the blue laser light to the third fluorescent wheel 303, and reflect the fluorescent light of the second color to the third dichroic plate 203. The third dichroic sheet 203 is also used to transmit the second color fluorescence to the second light transmitting component 40.

In the disclosed embodiment, the second fluorescent wheel 302 is used to reflect the fluorescent light of the first color to the third dichroic plate 203, and the third fluorescent wheel 303 is used to reflect the fluorescent light of the second color to the fourth dichroic plate 204. The fourth dichroic plate 204 is configured to reflect the fluorescent light of the first color to the first dichroic plate 402 and transmit the fluorescent light of the second color to the first dichroic plate 402 after reflecting the fluorescent light of the second color to the third dichroic plate 203. Thus, referring to fig. 5, the first dichroic filter 402 serves to transmit the blue laser light to the light valve 50 and reflect the fluorescence of the first color and the fluorescence of the second color to the light valve 50. Alternatively, referring to fig. 6, the first dichroic filter 402 is used to reflect the blue laser light to the light valve 50 and transmit the first color fluorescence and the second color fluorescence to the light valve 50.

In the embodiment of the present disclosure, an angle between the reflective surface of the third dichroic plate 203 and the optical axis of the blue laser light transmitted by the laser 10 to the first light transmission member 20 may be 45 degrees. The angle between the reflecting surface of the fourth dichroic plate 204 and the optical axis of the blue laser light transmitted by the laser 10 to the first light transmission component 20 may be 45 degrees. Also, an angle between an optical axis of the blue laser light transmitted from the fourth dichroic plate 204 to the third fluorescent wheel 303 and an optical axis of the fluorescent light transmitted from the fourth dichroic plate 204 to the first dichroic plate 402 may be 90 degrees. An angle between an optical axis of the blue laser light transmitted from the third dichroic plate 203 to the second fluorescent wheel 302 and an optical axis of the fluorescent light transmitted from the third dichroic plate 203 to the first dichroic plate 402 may be 90 degrees.

Referring to fig. 5 and 6, the first light transmission assembly 20 may further include a second lens 205 and a third lens 206, and both the second lens 205 and the third lens 206 may be convex lenses.

The second lens 205 is located between the third dichroic plate 203 and the second fluorescent wheel 302, and is used for condensing the blue laser light transmitted by the third dichroic plate 203 and transmitting the condensed blue laser light to the second fluorescent wheel 302, and transmitting the fluorescent light of the first color emitted by the second fluorescent wheel 302 to the third dichroic plate 203.

The third lens 206 is located between the fourth dichroic plate 204 and the third fluorescent wheel 303, and is configured to condense the blue laser light transmitted by the fourth dichroic plate 204 and transmit the condensed blue laser light to the third fluorescent wheel 303, and transmit the fluorescent light of the second color emitted by the third fluorescent wheel 303 to the fourth dichroic plate 204.

Referring to fig. 5 and 6, the first light transmitting assembly 20 may further include a second mirror group 207, the second mirror group 207 being located between the light emitting side of the laser 10 and the fourth dichroic sheet 204, the laser 10 being configured to emit blue laser light toward the second mirror group 207, the second mirror group 207 being configured to reflect the blue laser light toward the fourth dichroic sheet 204.

The second mirror group 207 may include a third mirror 2071 and a fourth mirror 2072 which are oppositely disposed. An angle between the reflective surface of the third reflector 2071 and the optical axis of the blue laser beam transmitted from the laser 10 to the second fluorescent wheel 302 may be 45 degrees, and an angle between the reflective surface of the fourth reflector 2072 and the optical axis of the blue laser beam transmitted from the laser 10 to the second fluorescent wheel 302 may be 45 degrees.

The third reflector 2071 is located on the light emitting side of the laser 10, and the laser 10 is used for emitting blue laser light to the third reflector 2071. The third reflector 2071 is used for reflecting the blue laser beam to the fourth reflector 2072, and the fourth reflector 2072 is used for reflecting the blue laser beam to the fourth dichroic plate 204.

In this implementation, the placement position of the first reflecting mirror 4011 on the light emitting side of the laser 10 and the placement position of the third reflecting mirror 2071 on the light emitting side of the laser 10 determine the ratio of the blue laser light transmitted by the laser 10 to the second light transmitting assembly 40 and the first light transmitting assembly 20.

Moreover, since the blue laser emitted by the laser 10 can be emitted to the first optical transmission assembly 20 and the second optical transmission assembly at the same time, the efficiency of projecting the laser to the projection screen is effectively improved.

It is to be understood that the terms "first," "second," "third," and "fourth" in the disclosed embodiments are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the embodiments of the present application, a plurality may mean two or more.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A laser projection device, characterized in that the laser projection device comprises: the device comprises a laser (10), a first light transmission component (20), a fluorescent wheel component (30), a second light transmission component (40), a light valve (50) and a projection lens (60); the first optical transmission component (20) and the second optical transmission component (40) are both positioned on the light outgoing side of the laser (10);

the laser (10) is used for emitting blue laser to the first optical transmission assembly (20) and the second optical transmission assembly (40) respectively;

the first light transmitting assembly (20) is for transmitting the blue laser light to the fluorescent wheel assembly (30);

the fluorescent wheel component (30) is used for emitting fluorescent light of at least one color under the excitation of the blue laser;

the first light transmitting component (20) is also used for transmitting the fluorescence of at least one color to the second light transmitting component (40);

the second light transmission component (40) is used for transmitting the blue laser and the fluorescence of at least one color to the light valve (50);

the light valve (50) is used for modulating the blue laser and the fluorescence of at least one color into an image beam and transmitting the image beam to the projection lens (60);

the projection lens (60) is used for projecting the image light beam onto a projection screen.

2. A laser projection device as claimed in claim 1, wherein the second light transmission assembly (40) comprises: a first set of mirrors (401) and a first dichroic filter (402);

the first reflector group (401) is positioned at the light emergent side of the laser (10) and is used for reflecting the blue laser to the first dichroic plate (402);

the first light transmission component (20) is used for transmitting the fluorescence of at least one color to the first dichroic filter (402);

the first dichroic filter (402) is used for transmitting the blue laser light to the light valve (50) and reflecting the fluorescence of the at least one color to the light valve (50); alternatively, the blue laser light is reflected to the light valve (50) and the fluorescence of the at least one color is transmitted to the light valve (50).

3. A laser projection device as claimed in claim 2, wherein the first set of mirrors (401) comprises: a first reflecting mirror (4011) and a second reflecting mirror (4012) which are arranged oppositely;

the first reflector (4011) is positioned at the light-emitting side of the laser (10), and the first reflector (4011) is used for reflecting the blue laser light to the second reflector (4012);

the second mirror (4012) is configured to reflect the blue laser light to the first dichroic filter (402).

4. A laser projection device as claimed in any one of claims 1 to 3, wherein the fluorescent wheel assembly (30) comprises: a first fluorescent wheel (301);

the first fluorescence wheel (301) comprises a first excitation region for emitting fluorescence of a first color under excitation by the blue laser light and a second excitation region for emitting fluorescence of a second color under excitation by the blue laser light;

or the first fluorescence wheel (301) is used for emitting fluorescence of a third color under the excitation of the blue laser;

5. A laser projection device as claimed in claim 4, wherein the first light transmission assembly (20) comprises: a second dichroic plate (201), the second dichroic plate (201) being located between the light exit side of the laser (10) and the first fluorescent wheel (301), the second dichroic plate (201) being configured to transmit the blue laser light to the first fluorescent wheel (301) and to reflect the at least one color of fluorescent light to the second light transmitting assembly (40).

6. The laser projection device of claim 5, wherein the first light delivery assembly (20) further comprises: a first lens (202);

the first lens (202) is located between the second dichroic sheet (201) and the first fluorescent wheel (301), and the first lens (202) is used for condensing the blue laser light transmitted by the second dichroic sheet (201) and transmitting the blue laser light to the first fluorescent wheel (301).

7. A laser projection device as claimed in any one of claims 1 to 3, wherein the fluorescent wheel assembly (30) comprises: a second fluorescent wheel (302) and a third fluorescent wheel (303);

the first light transmission component (20) is used for transmitting the blue laser light to the second fluorescent wheel (302) and the third fluorescent wheel (303) respectively;

the second fluorescence wheel (302) is used for emitting fluorescence of a first color under the excitation of the blue laser;

the third fluorescent wheel (303) is used for emitting fluorescent light of a second color under the excitation of the blue laser light.

8. The laser projection device of claim 7, wherein the first light delivery assembly (20) comprises: a third dichroic plate (203) and a fourth dichroic plate (204);

the third dichroic sheet (203) is located between the light exit side of the laser (10) and the second luminescent wheel (302) for transmitting the blue laser light to the second luminescent wheel (302) and reflecting the first color luminescent light to the second light transmitting component (40);

the fourth dichroic plate (204) is located between the light exit side of the laser (10) and the third luminescent wheel (303) for transmitting the blue laser light to the third luminescent wheel (303) and reflecting the luminescent light of the second color to the third dichroic plate (203);

the third dichroic sheet (203) is also for transmitting the fluorescent light of the second color to the second light transmitting component (40).

9. The laser projection device of claim 8, wherein the first light delivery assembly (20) further comprises: a second lens (205) and a third lens (206);

the second lens (205) is positioned between the third dichroic plate (203) and the second fluorescent wheel (302) and is used for condensing the blue laser light transmitted by the third dichroic plate (203) and transmitting the blue laser light to the second fluorescent wheel (302);

the third lens (206) is located between the fourth dichroic sheet (204) and the third fluorescent wheel (303), and is used for condensing the blue laser light transmitted by the fourth dichroic sheet (204) and transmitting the condensed blue laser light to the third fluorescent light.

10. A laser projection device as claimed in claim 8 or 9, wherein the first light transmission assembly (20) further comprises: a second mirror group (207);

the second mirror group (207) is located between the light exit side of the laser (10) and the fourth dichroic sheet (204) for reflecting the blue laser light to the fourth dichroic sheet (204).