WO2019153990A1

WO2019153990A1 - Projection system and laser illumination light source thereof

Info

Publication number: WO2019153990A1
Application number: PCT/CN2019/070435
Authority: WO
Inventors: 高志强; 杨伟樑; 赖泓基; 林清云
Original assignee: 广景视睿科技（深圳）有限公司
Priority date: 2018-02-09
Filing date: 2019-01-04
Publication date: 2019-08-15
Also published as: CN108303839B; CN108303839A

Abstract

Disclosed are a laser projection illumination light source (100) and a projection system thereof. The laser projection illumination light source (100) comprises a red laser light source (12), a blue laser light source (11), a rotatable filtering color wheel (22), a rotatable fluorescent color wheel (21) provided with an annular diffusion layer (214), a first filter (31), a second filter (32) and a plurality of reflectors (41, 42, 43). The first filter (31) is arranged between the rotatable filtering color wheel (22) and the rotatable fluorescent color wheel (21); a blue laser emitted by the blue laser light source (11) is irradiated to the first filter (31) for reflection; the blue laser emitted by the first filter (31) is irradiated to an annular fluorescent layer (213) of the rotatable fluorescent color wheel (21) for transmission or absorption; the annular fluorescent layer (213) absorbs the blue laser (A) to emit stimulated fluorescence; the propagation directions of the stimulated fluorescence and the transmitted blue laser are the opposite of each other, and thus, a fluorescent optical path and a blue laser optical path are separated; light combination of the blue laser and a red laser is performed at the second filter (32); and a hybrid laser emitted by the second filter (32) is irradiated to the annular diffusion layer (214) for suppression of speckles.

Description

Projection system and laser illumination source thereof

Technical field

The present application relates to the field of digital projection display, and more particularly to a projection system and a laser illumination source thereof.

Background technique

Most of the existing laser projection systems use a blue laser to excite phosphors as a projection source. The blue light of the system is directly provided by the blue laser. The green and red light of the system are excited by the blue laser respectively. The phosphor emits green fluorescence and yellow fluorescence, and the fluorescence is separately provided by the green light-transmissive section and the red light-transmissive section of the filter color wheel, and the green fluorescence and the red fluorescence are filtered out.

However, the solution has a problem of low color gamut, which is mainly caused by the low color purity of red fluorescence. If the filter color wheel is forced to filter out more yellow light to enhance the color purity of red fluorescence, the system will result in The red light segment is inefficient, dragging down the brightness of the whole machine, and the color gamut and brightness cannot be balanced. Usually, it is often necessary to ensure the brightness and sacrifice the color gamut.

In order to solve the problem of insufficient color gamut, adding a red laser to the projection system is an effective means. Adding a red laser on top of the red fluorescence can greatly improve the color purity of the red light of the projection system, while ensuring the whole machine. Brightness. However, as a coherent light source, the laser will produce speckle when projected onto the screen. The red laser is particularly noticeable, which seriously affects the quality of the projected image. Therefore, how to suppress the speckle phenomenon of the two-color laser system (blue laser + red laser) has become a laser. An important research direction in the field of projection.

Conventionally, the speckle generated by the laser light source can be eliminated by polarization diversity, wavelength diversity or angle diversity; specifically, passing the laser through a rotating diffusion sheet is currently used to suppress laser speckle. With the rotation of the diffuser, at different times, multiple random speckle patterns with random phase can be obtained on the screen. Through the integral effect of the human eye, multiple independent speckle patterns are superimposed in the human eye, which can effectively reduce the dispersion. The spot effect enhances the display quality of the projected image. According to the currently disclosed technical means, there are two ways of superimposing red laser and red fluorescence, the first being superimposed on time and the second being superimposed spatially. In the way of time superposition, the red light moment is divided into two parts, one part is red fluorescent light, the other part is red laser light, and the diffusing piece can be set on the fluorescent wheel or the color wheel. In the way of spatial superposition, the red fluorescence and the red laser are simultaneously illuminated, and there are two kinds of spatial illumination. The first one is to do the light through the dichroic filter. At this time, the diffusion sheet needs to be set in the red segment of the color wheel. Second, the red laser is incident on the phosphor corresponding to the red fluorescence, reflected by the phosphor and then enters the optical system. At this time, the phosphor is simultaneously excited by the blue laser to generate red fluorescence, red fluorescence and red required by the system. The laser enters the optical system along the same optical path; at this time, the phosphor has a diffusion and reflection effect on the red laser, and also acts to suppress speckle. In general, the spatial superposition scheme is more efficient than the time superposition; in the spatial superposition, the efficiency of the dichroic combining scheme is generally higher than that of the phosphor reflex scheme, and the phosphor reflex scheme has higher requirements on the phosphor processing and is difficult to implement. relatively bigger. In the spatial superposition, the dichroic filter is combined to form a light. Since the red area of the color wheel is provided with a diffusion sheet to eliminate the speckle, the red fluorescence will also pass through the region at the same time, and the red fluorescence passes through the diffusion sheet. The amount of light spread will increase, causing its light efficiency to drop, affecting the brightness of the whole machine. Therefore, it is necessary to design a laser projection light source illumination system, and the diffuser provided can eliminate the speckle of the red laser light, and does not affect the red fluorescent light path, thereby realizing the separation of the laser speckle light path and the fluorescent light path.

Summary of the invention

The technical problem to be solved by the embodiments of the present application is to provide a projection system capable of separating a laser light path from an excited fluorescent light path and suppressing the coherent laser light without affecting the stimulated fluorescent light path and a laser illumination source thereof.

To solve the above technical problem, one technical solution adopted by the embodiment of the present application is:

In one aspect, the present application provides a laser illumination source, including: a blue laser source for emitting a blue laser; a red laser source for emitting a red laser; and a rotatable fluorescent color wheel having a circular fluorescent layer disposed on a surface thereof; An annular diffusion layer, the annular fluorescent layer and the annular diffusion layer are disposed adjacent to each other, and the annular fluorescent layer is divided into a yellow phosphor region, a green phosphor region, and a blue laser transmission region, wherein the yellow phosphor region is used Absorbing a blue laser to emit yellow stimulated fluorescence, the green phosphor region for absorbing blue laser light to emit green stimulated fluorescence, and the blue laser transmission region for transmitting blue laser light, the circular diffusion The layer is for transmitting the red laser and the blue laser, and suppressing the speckle effect of the blue laser and the red laser; the rotatable filter color wheel is provided with an annular filter layer on the surface thereof, and the annular filter layer is divided into red light a transmissive region, a blue light transmitting region, and a green light transmitting region; a first filter disposed between the rotatable fluorescent color wheel and the rotatable filter color wheel, the first filter comprising relatively a first working surface and a second working surface, the first working surface of the filter is adjacent to the blue laser light source, and the first working surface of the first filter is for reflecting blue emitted by the blue laser light source a color laser, or a yellow stimulated fluorescence emitted from the yellow phosphor region to the rotatable filter color wheel, or a green stimulated fluorescence emitted from the green phosphor region is emitted to the rotatable filter color wheel. The second working surface of the filter is for reflecting the red laser, and transmitting the yellow stimulated fluorescent or green stimulated fluorescent or blue laser to the first working surface of the first filter; the annular diffusion layer is used Transmitting the red laser and the blue laser, and suppressing the speckle effect of the red laser and the blue laser; the second filter is for reflecting the blue laser or transmitting the red laser, and combining the blue laser and the red laser a ring-shaped diffusion layer; a first mirror for reflecting the blue laser light transmitted through the blue light-transmitting region to the first filter; and a second mirror for emitting the blue color of the second filter Mixed light of color laser and red laser Said second face of the first filter.

In some embodiments, the blue laser light source, the first filter, and the second mirror are sequentially arranged on a first reference line; the rotatable filter color wheel, the first filter, and the rotatable The fluorescent color wheel and the first mirror are sequentially arranged on the second reference line; the first mirror and the second filter are arranged on the third reference line; the second mirror and the rotatable fluorescent color wheel The second filter and the red laser source are sequentially arranged on the fourth reference line; the first reference line, the second reference line, the third reference line, and the fourth reference line are all located on the same plane.

In some embodiments, the laser illumination source further includes a third mirror; the third mirror is configured to inject a red laser light emitted from the red laser source to the second filter; an exit direction of the red laser source The blue laser light source, the first filter, and the second mirror are sequentially arranged on the first reference line; the rotatable filter color wheel, the first The filter, the rotatable fluorescent color wheel and the first mirror are sequentially arranged on the second reference line; the first mirror and the second filter are arranged on the third reference line; the second mirror The rotatable fluorescent color wheel, the second filter, and the third mirror are sequentially arranged on the fourth reference line; the first reference line, the second reference line, the third reference line, and the fourth reference line are all located in the same flat.

In some embodiments, the first reference line, the second reference line, the third reference line, and the fourth reference line are surrounded by a parallelogram.

In some embodiments, the first reference line, the second reference line, the third reference line, and the fourth reference line are surrounded by a rectangle.

In some embodiments, the first filter, the second filter, the first mirror, and the second mirror are both at an angle of 45 degrees from the horizontal direction.

In some embodiments, the laser illumination source further includes a first motor for driving the rotatable fluorescent color wheel to rotate, and a second motor for driving the rotatable The filter color wheel rotates; the rotatable fluorescent color wheel and the rotatable filter color wheel rotate synchronously.

In some embodiments, a ratio of the blue laser transmission region to the annular fluorescent layer is equal to a ratio of the blue light transmission region to the filter layer; the yellow phosphor region occupies the annular fluorescent layer a ratio equal to a ratio of the red light transmitting region to the filter layer; a ratio of the green phosphor region to the annular phosphor layer is equal to a ratio of the green light transmitting region to the filter layer; When the rotatable fluorescent color wheel and the rotatable filter color wheel rotate synchronously, the second reference line passes through the blue laser light transmitting region and the blue light transmitting region at the same time, or the second reference line passes through the yellow at the same time. The phosphor region and the red light transmitting region, or the second reference line passes through the green phosphor region and the green light transmitting region at the same time.

In some embodiments, the laser illumination source further includes a first relay lens, a second relay lens, a third relay lens, a fourth relay lens, and a converging lens; the first relay lens is disposed at the Between the first mirror and the second filter; the second relay lens is disposed between the red laser source and the first filter; the third relay lens is disposed at Between the second filter and the rotatable fluorescent color wheel; the fourth relay lens is disposed between the first filter and the second mirror; the converging lens is disposed at Between the first filter and the rotatable filter wheel.

In some embodiments, the laser illumination source further includes a first focus lens and a second focus lens; the first focus lens is disposed between the rotatable fluorescent color wheel and the rotatable filter color wheel, a focusing surface of the first focusing lens faces the rotatable fluorescent color wheel; the second focusing lens is disposed between the rotatable fluorescent color wheel and the first mirror, the second focusing lens The focusing surface faces the rotatable fluorescent color wheel; a distance between the first focusing lens and the rotatable fluorescent color wheel is equal to a distance between the second focusing lens and the rotatable fluorescent color wheel.

In some embodiments, the blue laser source and/or the red laser source comprises a plurality of laser light emitting chips for emitting laser light, and a light combining device for using the laser light The laser light emitted from the light-emitting chip is emitted in one direction.

In some embodiments, the blue laser source and/or the red laser source further includes a collimating lens for concentrating the individual laser beams exiting the light combining device into a laser beam.

In another aspect, the present application provides a projection system including the laser illumination source of the above claims.

The beneficial effects of the embodiments of the present application are: different from the prior art, in the projection system and the laser illumination source of the embodiment of the present application, the laser illumination source includes: a blue laser source for emitting blue laser; a laser light source for emitting a red laser; a rotatable fluorescent color wheel having a circular fluorescent layer disposed on a surface thereof, wherein the annular fluorescent layer is divided into a yellow phosphor region, a green phosphor region, and a blue laser transmissive region, the yellow a phosphor region for absorbing a blue laser to emit yellow stimulated fluorescence, the green phosphor region for absorbing a blue laser to emit green stimulated fluorescence, and a blue laser transmission region for transmitting a blue laser; a rotatable filter color wheel, the surface of which is provided with an annular filter layer, the annular filter layer is divided into a red light transmission region, a blue light transmission region and a green light transmission region; the first filter is disposed at the Between the rotatable fluorescent color wheel and the rotatable filter color wheel, the first filter comprises an opposite first working surface and a second working surface, and the first working surface of the filter is close to the Blue a light source, the first working surface of the first filter is for reflecting the blue laser light emitted by the blue laser light source, or the yellow stimulated fluorescence emitted from the yellow phosphor region is emitted to the rotatable filter color wheel Or emitting green stimulated fluorescence emitted from the green phosphor region to the rotatable filter color wheel, the second working surface of the filter is for reflecting the red laser and exciting the yellow stimulated fluorescence or green a fluorescent or blue laser light transmitted to the first working surface of the first filter; an annular diffusion layer for transmitting the red laser and the blue laser, and suppressing the speckle effect of the red laser and the blue laser; a light mirror for reflecting a blue laser or a transmissive red laser, and causing the blue laser and the red laser to be incident on the annular diffusion layer; the first mirror for reflecting the blue laser light transmitted through the blue transmission region And a second mirror for injecting the mixed light of the blue laser and the red laser emitted by the second filter to the second working surface of the first filter. In the above manner, the laser illumination source realizes separation of the laser light path from the fluorescent light path, suppresses the coherent laser light, and does not affect the fluorescent light path.

DRAWINGS

The one or more embodiments are exemplified by the accompanying drawings in the accompanying drawings, and FIG. The figures in the drawings do not constitute a scale limitation unless otherwise stated.

1 is a schematic structural diagram of a laser projection illumination source according to an embodiment of the present application;

2 is a schematic structural view of the blue laser light source and/or the red laser light source shown in FIG. 1;

3 is a schematic structural view of the rotatable fluorescent color wheel assembly shown in FIG. 1;

4 is a schematic structural view of another embodiment of the rotatable fluorescent color wheel assembly shown in FIG. 1;

Figure 5 is a schematic structural view of the rotatable filter color wheel assembly shown in Figure 1;

Figure 6 is a view showing the correlation between the wavelength and the transmittance of the first working surface of the first filter shown in Figure 1;

7 is a schematic diagram showing the correlation between the wavelength and the transmittance of the second working surface of the first filter shown in FIG. 1;

FIG. 8 is a schematic structural diagram of another laser projection illumination source according to an embodiment of the present application; FIG.

9 is a schematic view showing a state of use of the laser projection illumination source shown in FIG. 1;

FIG. 10 is a schematic view showing another use state of the laser projection illumination source shown in FIG. 1. FIG.

Detailed ways

In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific embodiments. It is to be noted that when an element is described as being "fixed" to another element, it can be directly on the other element, or one or more central elements can be present. When an element is referred to as "connected" to another element, it can be a <RTI ID=0.0> </ RTI> </ RTI> <RTIgt; The terms "vertical," "horizontal," "left," "right," and the like, as used in this specification, are for the purpose of illustration.

Unless otherwise defined, all technical and scientific terms used in the specification are the same meaning The terms used in the specification of the present application are for the purpose of describing the specific embodiments, and are not intended to limit the application. The term "and/or" used in this specification includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 , which is a laser projection illumination source 100 for use in a projection system according to an embodiment of the present application.

The laser projection illumination source 100 includes a blue laser source 11, a red laser source 12, a rotatable fluorescent color wheel assembly 21, a rotatable filter color wheel assembly 22, a first filter 31, a second filter 32, and a a mirror 41, a second mirror 42, a third mirror 43, a first focus lens 51, a second focus lens 52, a first relay lens 61, a second relay lens 62, a third relay lens 63, The fourth relay lens 64, the fifth relay lens 65, and the converging lens 66. The blue laser light source 11, the red laser light source 12, the rotatable fluorescent color wheel assembly 21, the rotatable filter color wheel assembly 22, the first filter 31, the second filter 32, the first mirror 41, Second mirror 42, third mirror 43, first focus lens 51, second focus lens 52, first relay lens 61, second relay lens 62, third relay lens 63, fourth relay lens 64. The fifth relay lens 65 and the converging lens 66 are all disposed on the same horizontal plane.

For the blue laser light source 11 described above, please refer to FIG. 9 or FIG. 10 for emitting the blue laser light A.

In the present embodiment, referring to FIG. 2, the blue laser light source 11 includes a plurality of blue laser light emitting chips 111, a first light combining device (not shown), and a first collimating lens group 112. Each of the blue laser light emitting chips 111 is configured to emit a corresponding blue laser light A1 to the first light combining device 112, and the first light combining device is configured to move the plurality of blue laser light rays A1 toward the first collimating lens group. 112 is emitted, and the first collimating lens group 112 is for emitting a plurality of parallel blue laser lights A in the same direction by a plurality of blue laser beams A1. The first light combining device includes a plurality of blue laser mirrors 113. Wherein, each blue laser mirror 113 is disposed in front of a corresponding blue laser light emitting chip 111, and each blue laser mirror 113 is used to emit blue laser light A1 corresponding to the corresponding blue laser light emitting chip 111. The first collimating lens group 112 is directed.

In some embodiments, the blue laser source 11 is a blue laser light emitting chip 111.

The above red laser light source 12, please refer to FIG. 9 or FIG. 10 for emitting red laser light B.

In the present embodiment, referring to FIG. 2, the red laser light source 12 includes a plurality of red laser light emitting chips 121, a second light combining device (not shown), and a second collimating lens group 122. Each of the red laser light emitting chips 121 is configured to emit a corresponding red laser light B1 to the second light combining device 122, and the second light combining device 122 is configured to emit the plurality of red laser light B1 toward the second collimating lens group 122. The second collimating lens group 122 is configured to emit a plurality of red laser beams B1 in a same direction to emit a parallel red laser beam B. The second light combining device includes a plurality of red laser mirrors 123. Each red laser mirror 123 is disposed in front of a corresponding red laser light emitting chip 121, and each red laser mirror 123 is used to shoot the red laser light B1 emitted from the corresponding red laser light emitting chip 121 toward the second standard. Straight lens group 122.

In some embodiments, the red laser source 12 is a red laser light emitting chip 121.

The above-described rotatable fluorescent color wheel assembly 21, please refer to FIG. 3, FIG. 9, and FIG. 10, which includes a rotatable fluorescent color wheel 211 and a first motor 212. The first motor 212 is used to drive the rotatable fluorescent color wheel 211 to rotate.

The surface of the rotatable fluorescent color wheel 211 is provided with an annular fluorescent layer 213 and an annular diffusion layer 214. The annular fluorescent layer 213 and the annular diffusion layer 214 are disposed adjacent to each other, and the annular fluorescent layer 213 and the annular diffusion layer 214 are coaxially disposed, and the annular fluorescent layer 213 is disposed. A yellow phosphor region 2131, a green phosphor region 2132, and a blue laser light transmitting region 2133 are divided in the radial direction. The yellow phosphor region 2131 is for absorbing the blue laser light A to emit the yellow stimulated fluorescent light C1, the green phosphor region 2132 is for absorbing the blue laser light A to emit the green stimulated fluorescent light C2, and the blue laser transmitting region 2133 is for transmitting The blue laser light A, the annular diffusion layer 214 is for transmitting the red laser light A and the blue laser light B, and suppresses the speckle effect of the blue laser light A and the red laser light B.

In the present embodiment, the area of the yellow phosphor region 2131 is smaller than the area of the green phosphor region 2132, and the area of the blue laser transmission region 2133 is smaller than the area of the yellow phosphor region 2132.

It can be understood that the relationship between the area size of the yellow phosphor region 2131, the green phosphor region 2132, and the blue laser transmission region 2133 may be other cases.

The first motor 212 is a stepping motor or a servo motor, and the rotation of the first motor 212 can be controlled by a first motor driver (not shown). For example, the rotational speed of the rotating shaft of the first motor 212 is controlled by the motor driver to be 7,200 rpm or 14,400 rpm.

In the present embodiment, the annular fluorescent layer 213 is located on the inner ring side of the surface of the rotatable fluorescent color wheel 211, and the annular diffusion layer 214 is located on the outer ring side of the surface of the rotatable fluorescent color wheel 211.

It can be understood that the positions of the annular fluorescent layer 213 and the annular diffusion layer 214 can be interchanged. In other embodiments, the annular fluorescent layer 213 is located on the outer ring side of the surface of the rotatable fluorescent color wheel 211, and the annular diffusion layer 214 is located. The inner ring side of the surface of the fluorescent color wheel 211 can be rotated.

In the present embodiment, there is no gap between the annular fluorescent layer 213 and the annular diffusion layer 214.

In other embodiments, referring to FIG. 4, there is a gap between the annular fluorescent layer 2112 and the annular diffusion layer 214. The rotatable fluorescent color wheel 211 includes a color wheel substrate 2111. The color wheel substrate 2111 is made of a metal material, and the annular fluorescent layer 213. Disposed on the surface of the color wheel substrate 2111, the color wheel substrate 2111 forms an opaque annular metal region 2112 at the gap.

The rotatable filter color wheel assembly 22 described above, please refer to FIG. 4, which includes a rotatable filter color wheel 221 and a second motor 222. The second motor 222 is configured to drive the rotatable filter color wheel 221 to rotate.

The surface of the rotatable filter color wheel 221 is provided with an annular filter layer 223. The annular filter layer 223 is divided into a red light transmission region 2231, a blue light transmission region 2233, and a green light transmission region 2232. The region 2231 is for filtering the yellow stimulated fluorescent light C1 to emit the red light C3, and the red transparent region 2231 is also for transmitting the red laser light B, and the green light transmitting region 22122 is for transmitting the green stimulated fluorescent light C2, and the blue transparent region 22123 Used to transmit blue laser A.

The second motor 222 is a stepping motor or a servo motor, and the rotation of the second motor 222 can be controlled by a second motor driver (not shown). For example, the rotational speed of the rotating shaft of the second motor 222 is controlled by the second motor driver to be 7,200 rpm or 14,400 rpm.

The first filter 31 described above, please refer to FIG. 1, FIG. 6, and FIG. 7, which are planar semi-lens structures. The first filter 31 includes opposing first working faces 311 and second working faces 312. The first working surface is for reflecting a light beam in a first predetermined wavelength range and transmitting the light beam in a second predetermined wavelength range. a second working surface for reflecting a light beam in a third predetermined wavelength range and transmitting a light beam in a fourth predetermined wavelength range. Correspondingly, the wavelength of the blue laser light A in the embodiment is within a common range of the first predetermined wavelength range and the fourth predetermined wavelength range; the wavelength of the red laser light B is within the third predetermined wavelength range; Both the wavelength of the excitation fluorescence C1 and the wavelength of the green stimulated fluorescence C2 are within a common range of the second predetermined wavelength range and the fourth predetermined wavelength range.

In this embodiment, the first predetermined wavelength range is less than 470 nanometers, the second predetermined wavelength range is greater than 500 nanometers, the third predetermined wavelength range is greater than 635 nanometers, and the fourth predetermined wavelength range is wavelengths. Between 430 nm and 605 nm. Correspondingly, the wavelength of the blue laser light A in the present embodiment is in the range of 430 nm to 470 nm; the wavelength of the red laser B is in the range of more than 635 nm; the wavelength of the yellow stimulated fluorescent C1 and the green color are The wavelength of the stimulating fluorescent C2 is in the range of between 500 nm and 605 nm.

Referring to FIG. 1 , the structure of the second filter 32 is similar to that of the first filter 31 . The second filter 32 includes an opposite third working surface 321 and a fourth working surface 322 . The third working surface 321 is for reflecting the blue laser light A and the transmitting red laser light B, and the fourth working surface 322 is for transmitting the red laser light B.

The specific positional relationship of each component of the above laser projection illumination source 100 is as follows, please refer to Figure 1:

The blue laser light source 11, the first filter 31, the fourth relay lens 64, and the second mirror 42 are sequentially arranged on the first reference line S1.

The annular filter layer 223 of the rotatable filter color wheel 22, the condenser lens 66, the first filter 31, the first focus lens 51, the annular fluorescent layer 213 of the rotatable fluorescent color wheel 21, the second focusing lens 52, and the A mirror 41 is sequentially arranged on the second reference line S2.

The first mirror 41, the first relay lens 61, and the second filter 32 are arranged in sequence on the third reference line S3;

In this embodiment, the second mirror 42, the annular diffusion layer 214, the third relay lens 63, the second filter 32, the second relay lens 62, and the third mirror 43 are sequentially arranged on the fourth reference line. The red laser light source 12, the fifth relay lens 65, and the third mirror 43 are sequentially arranged on the fifth reference line S5.

In other embodiments, referring to FIG. 8 , the laser projection illumination source 100 does not include the second relay lens 62 , the fifth relay lens 65 , and the third mirror 43 . The second mirror 42, the annular diffusion layer 214, the third relay lens 63, the second filter 32, the second relay lens 62, and the red laser light source 12 are sequentially arranged on the fourth reference line S4.

The first reference line S1, the second reference line S2, the third reference line S3, the fourth reference line S4, and the fifth reference line S5 are all located on the same plane. The first reference line S1, the second reference line S2, the third reference line S3, and the fourth reference line S4 are formed in a parallelogram shape, and the first filter 31, the second filter 32, and the first mirror 41 are formed. The angle between the second mirror 42 and the third mirror 43 and the exit direction of the blue laser light source 11 ranges from 0 to 45 degrees.

Further, the first reference line S1, the second reference line S2, the third reference line S3, and the fourth reference line S4 are surrounded by a rectangular shape, and the first filter 31, the second filter 32, and the first reflection The angle between the mirror 41, the second mirror 42, and the third mirror 43 and the emission direction of the blue laser light source 11 is 45 degrees.

The rotatable filter color wheel 311 is disposed in parallel with the rotatable fluorescent color wheel 211.

The first working surface 311 of the first filter 31 is adjacent to the blue laser light source 11, and the fourth working surface 322 of the second filter 32 is adjacent to the third mirror 43.

The reflecting surface of the first reflecting mirror 41 is close to the annular fluorescent layer 213, the reflecting surface of the second reflecting mirror 42 is close to the annular fluorescent layer 213, and the reflecting surface of the third reflecting mirror 43 is close to the red laser light source 12.

The focal planes of the first focusing lens 51 and the second focusing lens 52 are both directed toward the annular fluorescent layer 213, and the distance between the first focusing lens 51 and the annular fluorescent layer 213 is equal to the distance between the second focusing lens 52 and the annular fluorescent layer 213. distance.

The condensing surface of the converging lens 66 faces the annular filter layer 223.

When the laser projection illumination source 100 described above is used, different regions incident on the annular fluorescent layer 213 according to the blue laser A include the following three states:

Referring to FIG. 9, when the blue laser light is incident on the blue laser light transmitting region 2133 of the annular fluorescent layer 213.

On the one hand, the blue laser light A emitted from the blue laser light source 11 is incident on the first working surface 311 of the first filter 31, and the blue laser light A emitted from the first working surface 311 of the first filter 31 is incident. The blue laser light transmitting region 2133 is transmitted, the blue laser light A emitted from the blue laser light transmitting region 2133 is incident on the first reflecting mirror 41, and the blue laser light A emitted from the first reflecting mirror 41 is incident on the second filter. The third working surface 321 of the light mirror 32 is reflected; on the other hand, the red laser light B emitted from the red laser light source 12 is incident on the third mirror 43 and the red laser light B emitted from the third mirror 43 is incident on the second filter. The light mirror 32 is transmitted. The blue laser light A and the red laser light B are combined at the second filter 32, and the mixed laser light of the blue laser light A and the red laser light B emitted from the second filter lens 32 is incident on the annular diffusion layer 214, and is circularly diffused. The layer 214 suppresses the speckle effect of the hybrid laser, the mixed laser light emitted from the annular diffusion layer 214 is incident on the second mirror 42 and the mixed laser light emitted from the second mirror 42 is incident on the second working surface of the first filter 31. The reflection 312 occurs, and the mixed laser light emitted from the second working surface 312 of the first filter 31 is incident on the converging lens 66 to be concentrated, and the mixed laser light emitted from the converging lens 66 is incident on the annular filter layer 223 for color filter.

Referring to FIG. 10, when the blue laser light A is incident on the yellow phosphor layer 2131 of the annular fluorescent layer 213.

On the one hand, the blue laser light A emitted from the blue laser light source 11 is incident on the first working surface 311 of the first filter 31, and the blue laser A emitted from the first working surface 311 of the first filter 31 is incident. The yellow phosphor region 2131 is absorbed, the yellow phosphor region 2131 absorbs the blue laser A to emit the stimulated yellow fluorescent C1, and the yellow phosphor region 2131 emits the excited yellow fluorescent C1 to be incident on the first filter 31 for transmission; On the one hand, the red laser light B emitted from the red laser light source 12 is incident on the third mirror 43 to be emitted, the red laser light B emitted from the third mirror 43 is incident on the second filter 32, and the second filter 32 is emitted. The red laser light B is incident on the annular diffusion layer 214, the red laser light B emitted from the annular diffusion layer 214 is incident on the second mirror 42 and the red laser light B emitted from the second mirror 42 is incident on the first filter 31. The second working surface 312 is reflected. The yellow stimulated fluorescent light C1 and the red laser light B are combined at the first filter 31, and the yellow stimulated fluorescent light C1 and the red laser light B emitted from the first filter 31 are incident on the converging lens 66 to be concentrated, and the mixed light emitted from the converging lens 66 is concentrated. It is incident on the annular filter layer 333 for color filter.

Referring to FIG. 10, when the blue laser A is incident on the green phosphor layer 2132 of the annular fluorescent layer 213, it is the same as when the blue laser A is incident on the yellow phosphor layer 2131 of the annular fluorescent layer 313, and details are not described herein. .

In the present embodiment, the rotatable fluorescent color wheel 211 and the rotatable filter color wheel 221 can be controlled to rotate synchronously by the first motor 212 and the second motor 222, respectively, by the first motor driving device and the second motor driving device.

Further, the ratio of the blue laser transmission region 2133 to the annular fluorescent layer 213 is equal to the ratio of the blue light transmission region 2233 to the annular filter layer 223; the ratio of the yellow phosphor region 2131 to the annular fluorescent layer 213 is equal to the red light transmission region. 2231 occupies the proportion of the annular filter layer 223; the ratio of the green phosphor region 2132 to the annular phosphor layer 213 is equal to the ratio of the green light transmission region 2232 to the annular filter layer 223.

When the rotatable fluorescent color wheel 211 and the rotatable filter color wheel 221 rotate in synchronization, the second reference line S2 simultaneously passes through the blue laser light transmitting region 2133 and the blue light transmitting region 2233, or the second reference line S2 simultaneously The yellow phosphor region 2131 and the red light transmitting region 2231 are passed through, or the second reference line S2 passes through the green phosphor region 2132 and the green light transmitting region 2232 at the same time.

Embodiments of the present application also provide a projection system including the above-described laser projection illumination source 100, a housing, a square bar or a fly-eye lens, a prism set or a free-form lens group, a DMD display chip, and a projection lens. Wherein, the outer casing forms a receiving cavity, the laser projection illumination source 100, the outer casing, the square rod or the fly-eye lens, the prism group or the free-form lens group, and the DMD display chip are mounted in the accommodating cavity of the outer casing, and the outer casing is provided with an opening, and the opening is The accommodating cavity of the outer casing communicates with the outer space of the outer casing, and the projection lens is mounted to the opening.

Compared with the prior art, the embodiments of the present invention provide a laser projection illumination source and a projection system thereof, wherein the laser projection illumination source is separated from the fluorescent optical path by the laser optical path, and the coherent laser is suppressed while the fluorescent optical path is not affected.

In addition, the laser projection illumination source adopts a rectangular loop and is compact in structure.

The above description is only the embodiment of the present application, and thus does not limit the scope of the patent application, and the equivalent structure or equivalent process transformation of the specification and the drawings of the present application, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of this application.

Claims

A laser illumination source characterized by comprising:

a blue laser source for emitting blue laser light;

a red laser source for emitting red laser light;

a rotatable fluorescent color wheel having an annular fluorescent layer and an annular diffusion layer disposed on a surface thereof, the annular fluorescent layer and the annular diffusion layer being disposed adjacent to each other, the annular fluorescent layer being divided into a yellow phosphor region and a green phosphor region a blue laser light transmissive region for absorbing blue laser light to emit yellow stimulated fluorescence, the green phosphor region for absorbing blue laser light to emit green stimulated fluorescence, the blue laser light The transmission region is for transmitting a blue laser light for transmitting the red laser light and the blue laser light, and suppressing the speckle effect of the blue laser light and the red laser light;

a rotatable filter color wheel, the surface of which is provided with an annular filter layer, wherein the annular filter layer is divided into a red light transmission region, a blue light transmission region and a green light transmission region;

a first filter disposed between the rotatable fluorescent color wheel and the rotatable filter color wheel, the first filter comprising an opposite first working surface and a second working surface, the filter The first working surface of the light mirror is adjacent to the blue laser light source, and the first working surface of the first filter is used to reflect the blue laser light emitted by the blue laser light source or the yellow light emitted from the yellow phosphor light area Exciting fluorescence is emitted to the rotatable filter color wheel, or green stimulated fluorescence emitted from the green phosphor region is emitted to the rotatable filter color wheel, and the second working surface of the filter is used to reflect red Laser and transmitting yellow stimulated fluorescent or green stimulated fluorescent or blue laser light to the first working surface of the first filter;

a second filter for reflecting the blue laser or transmitting the red laser, and causing the blue laser and the red laser to be incident on the annular diffusion layer;

a first mirror for reflecting the blue laser light transmitted through the blue light transmitting region to the first filter;

a second mirror for injecting mixed light of the blue laser and the red laser emitted from the second filter to the second working surface of the first filter.
The laser illumination source according to claim 1, wherein the blue laser source, the first filter and the second mirror are sequentially arranged on a first reference line;

The rotatable filter color wheel, the first filter, the rotatable fluorescent color wheel and the first mirror are sequentially arranged on the second reference line;

The first mirror and the second filter are arranged on a third reference line;

The second mirror, the rotatable fluorescent color wheel, the second filter, and the red laser source are sequentially arranged on the fourth reference line;

The first reference line, the second reference line, the third reference line, and the fourth reference line are all located on the same plane.
The laser illumination source according to claim 1, wherein the laser illumination source further comprises a third mirror;

The third mirror is configured to inject a red laser light emitted by the red laser light source to the second filter;

The emission direction of the red laser light source is the same as the emission direction of the blue laser light source;

The blue laser light source, the first filter, and the second mirror are sequentially arranged on the first reference line;

The rotatable filter color wheel, the first filter, the rotatable fluorescent color wheel and the first mirror are sequentially arranged on the second reference line;

The first mirror and the second filter are arranged on a third reference line;

The second mirror, the rotatable fluorescent color wheel, the second filter, and the third mirror are sequentially arranged on the fourth reference line;

The first reference line, the second reference line, the third reference line, and the fourth reference line are all located on the same plane.
The laser illumination source according to claim 2 or 3, wherein the first reference line, the second reference line, the third reference line, and the fourth reference line are surrounded by a parallelogram.
The laser illumination source according to claim 4, wherein the first reference line, the second reference line, the third reference line, and the fourth reference line are each formed in a rectangular shape.
The laser illumination source according to claim 5, wherein the first filter, the second filter, the first mirror, and the second mirror are at an angle of 45 degrees with respect to the horizontal direction.
The laser illumination source according to any one of claims 2 to 3, wherein the laser illumination source further comprises a first motor and a second motor, the first motor for driving the rotatable fluorescent color wheel Rotating, the second motor is configured to drive the rotatable filter color wheel to rotate;

The rotatable fluorescent color wheel and the rotatable filter color wheel rotate in synchronization.
A laser illumination source according to claim 7, wherein

a ratio of the blue laser transmission region to the annular fluorescent layer is equal to a ratio of the blue light transmission region to the filter layer;

The ratio of the yellow phosphor region to the annular phosphor layer is equal to the ratio of the red light transmitting region to the filter layer;

The ratio of the green phosphor region to the annular phosphor layer is equal to the ratio of the green transmissive region to the filter layer;

When the rotatable fluorescent color wheel and the rotatable filter color wheel rotate synchronously, the second reference line passes through the blue laser light transmitting region and the blue light transmitting region at the same time, or the second reference line passes through at the same time The yellow phosphor region and the red light transmitting region, or the second reference line passes through the green phosphor region and the green light transmitting region at the same time.
The laser illumination source according to any one of claims 1 to 3, wherein the laser illumination source further comprises a first relay lens, a second relay lens, a third relay lens, and a fourth relay lens. And a converging lens;

The first relay lens is disposed between the first mirror and the second filter;

The second relay lens is disposed between the red laser light source and the first filter;

The third relay lens is disposed between the second filter and the rotatable fluorescent color wheel;

The fourth relay lens is disposed between the first filter and the second mirror;

The converging lens is disposed between the first filter and the rotatable filter color wheel.
The laser illumination source according to any one of claims 1 to 3, wherein the laser illumination source further comprises a first focus lens and a second focus lens;

The first focusing lens is disposed between the rotatable fluorescent color wheel and the rotatable filter color wheel, and a focusing surface of the first focusing lens faces the rotatable fluorescent color wheel;

The second focusing lens is disposed between the rotatable fluorescent color wheel and the first mirror, and a focusing surface of the second focusing lens faces the rotatable fluorescent color wheel;

A distance between the first focus lens and the rotatable fluorescent color wheel is equal to a distance between the second focus lens and the rotatable fluorescent color wheel.
The laser illumination source according to any one of claims 1 to 3, wherein the blue laser source and/or the red laser source comprises a plurality of laser light emitting chips and a light combining device, and the laser light emitting chip is used for emitting Laser light, the light combining device is configured to emit laser light emitted from the laser light emitting chip in one direction.
The laser illumination source of claim 11 wherein said blue laser source and/or red laser source further comprises a collimating lens for concentrating respective laser beams exiting the light combining means Become a laser beam.
A projection system comprising the laser projection illumination source of any one of claims 1 to 12.