CN109358467B

CN109358467B - Laser light source, light source mode switching method and laser projection equipment

Info

Publication number: CN109358467B
Application number: CN201811368154.0A
Authority: CN
Inventors: 朱亚文; 赵一石
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2018-11-16
Filing date: 2018-11-16
Publication date: 2023-01-10
Anticipated expiration: 2038-11-16
Also published as: CN109358467A

Abstract

The invention provides a laser light source, a light source mode switching method and laser projection equipment. The laser light source comprises a laser for generating laser; a fluorescent wheel for receiving the laser light and emitting fluorescent light of at least one color; the color filtering wheel rotates synchronously with the fluorescent wheel and comprises a first color filtering plate and a second color filtering plate which are arranged along the radial direction of the color filtering wheel; the light path guide element is arranged on a light path between the fluorescence wheel and the color filtering wheel and is used for guiding the fluorescence of at least one color to be emitted to the first color filtering plate or the second color filtering plate; wherein the first color filter is configured to receive the fluorescent light of the at least one color and output light of a first spectral width; the second color filter is used for receiving the fluorescence of the at least one color and outputting light with a second spectral width; and the first spectral width is greater than the second spectral width, improving the applicability of the laser light source.

Description

Laser light source, light source mode switching method and laser projection equipment

Technical Field

The invention relates to the field of laser projection display, in particular to a laser light source, a light source mode switching method and laser projection equipment.

Background

With the continuous progress of science and technology, laser projection devices are increasingly appearing in family entertainment and work of people due to the advantages of wide color gamut, high color purity and the like.

At present, in a laser projection display device, monochromatic laser and a fluorescent wheel are usually adopted to cooperate with a color filter wheel to realize the acquisition of three primary colors of red, green and blue. Specifically, the monochromatic laser usually uses blue light, the fluorescent wheel at least comprises a red light conversion partition, a green light conversion partition and a light source transmission area, correspondingly, the red light conversion partition is provided with a red light conversion material, the green light conversion partition is provided with a green light conversion material, and the light source transmission area is not provided with a light conversion material. The blue light irradiates on the fluorescence wheel to excite the fluorescence with the same color corresponding to the light conversion subarea, namely red fluorescence and green fluorescence, the light source transmission area transmits the blue light, and the blue light is further filtered by the filtering color wheel, wherein the fluorescence wheel and the filtering color wheel rotate synchronously and are correspondingly provided with a red light filtering area, a green light filtering area and a blue light transmission area. As shown in fig. 1, the color filter wheel includes a red light filtering area 11, a green light filtering area 12, and a blue light transmitting area 13, wherein the red light filtering area 11 is provided with a red light filter coated with a red light filtering film, and only transmits light with red wavelength and filters light with other wavelengths; the green light filtering area 12 is provided with a green light filter which is plated with a green light filtering film and only can transmit light with green wavelength and filter light with other wavelength colors; the blue light transmission region 11 transmits blue light, is not coated with a filter film, and is completely transparent. The red fluorescent light, the green fluorescent light and the blue light emitted by the fluorescent wheel respectively irradiate the color filtering area 11, the color filtering area 12 and the transmission area 13 to obtain three primary colors of different application functions, namely red light, green light and blue light.

Different application functions have different requirements on colors, for example, drawing demonstration requires a display image with higher brightness, but the requirements on colors are not high, and when the display device is applied to a home theater or a rear projection television, color display is emphasized, but most of the current projection systems cannot have multiple modes such as high brightness, high color and the like.

Disclosure of Invention

The invention provides a laser light source, which can obtain light with different spectral widths by using a single color filter wheel, and achieves the purpose of having two modes of high brightness and high color.

In a first aspect, the present invention provides a laser light source, comprising a laser for generating laser light; a fluorescent wheel for receiving the laser light and emitting fluorescent light of at least one color; the color filtering wheel rotates synchronously with the fluorescent wheel and comprises a first color filtering plate and a second color filtering plate which are arranged along the radial direction of the color filtering wheel; and the light path guide element is arranged on the light path between the fluorescence wheel and the color filtering wheel and is used for guiding and emitting the fluorescence of at least one color to the first color filtering plate or the second color filtering plate.

The first color filter is used for receiving the fluorescence of at least one color emitted by the light path guide element and outputting light with a first spectral width; the second color filter is used for receiving the fluorescence of at least one color emitted by the light path guide element and outputting light with a second spectral width; and the first spectral width is greater than the second spectral width.

Preferably, the light of the first spectral width is a first spectral width red light with a spectral width larger than the first range width, or a first spectral width green light with a spectral width larger than the second range width; the light of the second spectral width is red light of the second spectral width smaller than the third range width, or green light of the second spectral width smaller than the fourth range width.

Preferably, the light of the first spectral width comprises a first spectral width red light having a spectral width greater than the first range width, and a second spectral width green light having a spectral width greater than the second range width; the light of the second spectral width comprises a red light of the second spectral width smaller than the third range width, and a green light of the second spectral width smaller than the fourth range width

Further, the fluorescent wheel includes a fluorescent area and a first transmission area distributed along the outer circumference, the fluorescent area is used for receiving the laser and emitting fluorescent light of at least one color, and the first transmission area transmits the laser.

Furthermore, a second transmission area and a third transmission area are respectively arranged on the circumferences of the first color filter plate and the second color filter plate, and laser emitted from the first transmission area is guided to the second transmission area and the third transmission area through the light path guide element.

Further, the first color filter plate is arranged on the outer circumference of the color filter wheel, and the second color filter plate is arranged on the inner side of the first color filter plate.

Further, the optical path directing element includes a first mirror and a second mirror; wherein the first mirror is at a first angle and a second angle; when the first reflector is positioned at a first angle, the first reflector receives fluorescence of at least one color and reflects the fluorescence to the second reflector, and the second reflector reflects the received fluorescence to the second color filter plate; when the second reflector is at the second angle, the fluorescence of at least one color directly exits to the first color filter.

Preferably, the first, second, and third transmissive regions are glass substrates or diffusion sheets.

Furthermore, the laser light source also comprises a positioning device and a first stepping motor, wherein the light path guide element is arranged on the positioning device, and the first stepping motor is used for controlling the positioning device to enable the light path guide element to guide the fluorescence of at least one color to be emitted to the first color filter plate or the second color filter plate.

In a second aspect, the present invention provides a laser projection apparatus, including the above laser light source, and further including an optical machine, configured to receive the laser light source and modulate output; and the lens is used for receiving the modulated light source output by the light receiver for imaging and projecting the modulated light source to a projection screen to form a projection picture.

In a third aspect, the present invention provides a method for switching laser light source modes, which is applied to the above laser projection apparatus, and includes the following steps:

receiving a mode switching instruction;

turning off the laser;

the first stepping motor controls the positioning device to enable the light path guide element to guide at least one color of fluorescence to be emitted to the first color filter plate or the second color filter plate;

the laser is started.

The invention provides a laser light source, a light source mode switching method and laser projection equipment, wherein the laser light source comprises a laser for generating laser, a fluorescent wheel for receiving the laser and emitting fluorescence of at least one color, and a color filtering wheel for filtering the fluorescence, the color filtering wheel consists of a first color filtering plate and a second color filtering plate which are arranged along the radial direction of the color filtering wheel, the first color filtering plate and the second color filtering plate have different optical properties, so that light with different spectral widths can be obtained by filtering, and meanwhile, the guide of an emergent light path of the fluorescent wheel is realized by a light path guide element arranged between the fluorescent wheel and the color filtering wheel, so that the light can be emitted to the first color filtering plate or the second color filtering plate according to the requirement. Therefore, the invention realizes the purpose of obtaining light with different spectral widths by a single color filter wheel by the structural design of the first color filter plate and the second color filter plate in the radial direction on the color filter wheel and the light path guide function of the light path guide element, and improves the applicability of the laser light source.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art color filter wheel;

fig. 2 is a schematic structural diagram of a laser light source according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a color filter wheel according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a fluorescent wheel provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an optical path directing element in a first state according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an optical path directing element in a second state according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a laser projection apparatus according to a second embodiment of the present invention;

fig. 8 is a flowchart of a laser light source mode switching method according to a third embodiment of the present invention;

fig. 9 is a flowchart of a second laser source mode switching method according to a third embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 2 is a schematic structural diagram of a laser light source according to a first embodiment of the present invention. Fig. 3 is a schematic structural diagram of a color filter wheel in a laser light source according to an embodiment of the present invention. As shown in fig. 2 and fig. 3, the present embodiment provides a laser light source, including: a laser 1 for generating laser light; a fluorescent wheel 4 for receiving the laser light and exciting at least one color of fluorescent light; the color filter wheel 2 rotates synchronously with the fluorescent wheel 4 and comprises a first color filter plate 21 and a second color filter plate 22 which are arranged along the radial direction of the color filter wheel 2; the light path guiding element 3 is arranged on a light path between the fluorescent wheel 4 and the color filter wheel 2 and is used for guiding and emitting the fluorescence of at least one color to the first color filter plate 21 or the second color filter plate 22, wherein the first color filter plate 21 is used for receiving the fluorescence of at least one color guided and emitted by the light path guiding element 3 and outputting light with a first spectral width; the second color filter 22 is used for receiving the fluorescence of at least one color emitted from the light path directing element 3 and outputting light with a second spectral width; and the first spectral width is greater than the second spectral width.

The embodiment provides a laser light source, and a multi-color light source with different spectral widths is obtained by filtering color filter plates with different filtering performances on a color wheel, so that a single color wheel can generate a multi-mode laser light source, and the applicability of the laser light source is improved.

Specifically, the laser 1 may be a single laser or a combination of multiple lasers, where the multiple lasers are vertically arranged and emit laser light of at least one color, and in this embodiment, a single laser is used, and the laser 1 may emit blue laser light.

The laser 1 emits laser light to enter the fluorescent wheel 4. Because the laser beam area that laser 1 self sent is great, and the light beam that fluorescence excitation required is less, consequently still be equipped with focusing optics 5 between laser 1 and fluorescence wheel 4 for laser beam diminishes, in order to accord with the requirement of fluorescence excitation.

Further, after being condensed by the focusing optics 5, the laser is emitted to the periodically rotating fluorescent wheel 4, and the fluorescent wheel 4 includes a fluorescent area and a first transmission area, which are distributed along the outer circumference, wherein the fluorescent area is used for receiving the laser and emitting fluorescent light of at least one color, and the first transmission area is used for transmitting the laser. Specifically, in order to provide a three primary color light source required for laser display imaging, the fluorescent region may include yellow phosphor 4a and green phosphor 4b, and the first transmissive region does not include a phosphor material. The blue laser beam sequentially irradiates the outer circumferential area, thereby sequentially exciting the corresponding fluorescent regions to generate green fluorescent light and yellow fluorescent light, and is transmitted from the first transmission region, as shown in fig. 4. When the laser light source is used in an illumination system, the fluorescent region of the laser light source may include only yellow phosphor or only green phosphor, and likewise, the first transmissive region does not include phosphor material.

Since the spectral ranges of the green fluorescence and the yellow fluorescence emitted from the fluorescence wheel 4 are wide, the purity of the corresponding primary light is poor, and the color gamut of the corresponding color is poor. The color filter wheel 2 is used for filtering the broad spectrum fluorescence emitted from the fluorescent wheel 4 to output light with high purity or high brightness, and the related parameters of the color filter wheel 2 determine the spectral characteristics of the emitted filtered light. It should be noted that, in the process of filtering to obtain the light source color, the yellow fluorescent light is generally filtered by the color filter wheel 2 to obtain the red light, and the green fluorescent light is filtered by the color filter wheel 2 to obtain the green light, and the fluorescent area of the above-mentioned fluorescent wheel is provided with the yellow fluorescent powder 4a for providing the yellow fluorescent light generating the red light.

Specifically, in the present embodiment, the color filter wheel 2 rotates synchronously with the fluorescent wheel 4, and includes a first color filter 21 and a second color filter 22 arranged in a radial direction; the first color filter 21 and the second color filter 22 are further provided with a second transmission area and a third transmission area in the circumferential direction, respectively, and the laser emitted from the first transmission area is guided to the second transmission area and the third transmission area by the light path guide element 3.

The first color filter 21 and the second color filter 22 have different color filtering performances, the first color filter 21 is configured to receive the fluorescence of at least one color and output a first broad spectrum of light, and the second color filter 22 is configured to receive the fluorescence of at least one color and output a second broad spectrum of light, where the first spectral width is greater than the second spectral width. In the first embodiment, the first color filter 21 is used for filtering light with a wider spectrum, and the second color filter 22 is used for filtering light with a narrower spectrum. As can be seen from the spectral characteristics of light, the narrower the spectral width of light, the better the color purity, and conversely, the wider the spectral width, the poorer the color purity, but the higher the luminance. Therefore, the color filter wheel 2 in this embodiment can provide light sources in two modes, and the color filters with corresponding parameters are arranged on different color filter plates of the color filter wheel to obtain filtering light with corresponding spectral widths.

The filter adopts an F-P (Fabry-Perot) filter, and the basic principle is to realize the transmission and the filtration of light beams by utilizing a multi-beam interference phenomenon. The F-P filter is the most commonly used narrow-band interference filter at present, for example, when filtering red light and green light, the center wavelength of the transmission peak is one of the center wavelengths of the primary colors of red light or green light by adjusting the relevant parameters of the F-P filter, meanwhile, the reflectivity at the wavelength of the other primary color of green light or red light is large enough, and finally, the filter for generating the primary colors of red light and green light can be obtained by superposing the two. By adopting the optical filters with corresponding parameters and defining the spectral threshold of the corresponding color light, the color light with higher color purity and spectral width smaller than the spectral threshold or the color light with higher brightness and spectral width larger than the spectral threshold is obtained.

Therefore, in this embodiment, when the laser light source is used to provide a monochromatic illumination light source, the fluorescent region of the fluorescent wheel 4 only contains yellow phosphor 4a or only contains green phosphor 4b, and is used to generate yellow fluorescent light or green fluorescent light, and further guide the yellow fluorescent light or filtered fluorescent light emitted from the fluorescent wheel 4 through the optical path directing element 3 to emit onto the first color filter 21 or the second color filter 22 with different color filter properties, specifically, the light with the first spectral width output by the first color filter 21 is red light with a spectral width greater than the first spectral width, or green light with a spectral width greater than the second spectral width; the light with the second spectral width output by the second color filter 22 is red light with the second spectral width smaller than the third range width, or green light with the second spectral width smaller than the fourth range width. Because the first spectral width is larger than the second spectral width, the red light or the green light filtered by the first color filter 21 has better brightness, and the red light or the green light filtered by the second color filter 22 has better purity, so that the aim of providing a multi-mode light source by the laser light source is fulfilled.

The first range and the third range are ranges with the central wavelength of red light as a center, and the larger the first range is, the better the brightness of the red light is, but the purity is poor; the smaller the third range, the less bright the red light is, but the better the purity. Similarly, the second range and the fourth range are ranges centered on the wavelength of green light, and the larger the second range is, the better the brightness of green light is, but the purity is poor; the smaller the fourth range, the less bright the green light but the better the purity. The selection of the first range, the second range, the third range and the fourth range is related to the physical structure and physical parameters of the optical filter, and those skilled in the art can select the ranges according to design requirements, which is not described herein again.

In this embodiment, when the laser light source needs to provide a three-primary-color light source, the laser emits blue laser light, the fluorescent wheel 4 includes a fluorescent area provided with a yellow phosphor 4a and a green phosphor 4b for generating yellow fluorescent light and green fluorescent light, and the first transmissive area directly transmits the blue laser light, and further guides the yellow fluorescent light, the green fluorescent light and the blue laser light to emit onto the first color filter 21 and the second color filter 22 with different color filter properties through the optical path directing element 3, specifically, the light with the first spectral width output by the first color filter 21 includes a red light with a spectral width greater than a first range width, and a green light with a second spectral width with a spectral width greater than a second range width; the light with the second spectral width output by the second color filter 22 includes red light with the spectral width smaller than the third range width and green light with the spectral width smaller than the fourth range width; and the blue laser light is transmitted directly through the second color filter to produce blue light. Because the first spectral width is larger than the second spectral width, the red light and the green light filtered by the first color filter 21 have better brightness, and the red light and the green light filtered by the second color filter 22 have better purity, so that the aim of providing a multi-mode light source by the laser light source is fulfilled.

Specifically, because the laser source has a high purity and a high brightness, the first transmission region and the second transmission region are made of glass substrates or diffusion sheets, and can directly transmit laser for illumination or imaging.

It should be noted that, in addition to the second transmission region, the red filter region and the green filter region, the first color filter 21 and the second color filter 22 may further include other filter regions, such as a yellow filter region. Specifically, the number of the filter regions in the color filter wheel and the types of the filters corresponding to the filter regions may be set and adjusted according to actual needs, which is not limited herein.

Further, in the laser light source provided in the present embodiment, the first color filter 21 in the color filter wheel 2 is disposed on the outer circumference of the color filter wheel 2, and the second color filter 22 is disposed on the inner side of the first color filter 21.

Further, in order to realize the switching when the first color filter plate 21 and the second color filter plate 22 are applied on the color filter wheel 2, a light path guiding element 3 is further disposed between the fluorescent wheel 4 and the color filter wheel 2, the light path guiding element 3 is used for guiding the light path to the first color filter plate 21 or the second color filter plate 22, and the light path guiding element 3 provided in this embodiment includes a first reflecting mirror 31 and a second reflecting mirror 32; wherein the first mirror 31 may be at a first angle and a second angle; when the first reflector 31 is at the first angle, the first reflector 31 receives the fluorescence of at least one color and reflects the fluorescence to the second reflector 32, and the second reflector 32 reflects the received fluorescence to the second color filter 22; when the second reflector 32 is at the second angle, the fluorescence of at least one color is directly emitted to the first color filter 21.

Specifically, the first mirror 31 and the second mirror 32 are disposed in parallel, the first angle is preferably 45 ° with respect to the optical path, and the fluorescent light is emitted onto the second color filter 22 through the first mirror 31 and the second mirror 32 in sequence, as shown in fig. 5; the second angle of the mirror is: the first reflecting mirror 31 is disposed in parallel with the optical path of the fluorescent light, so that the fluorescent light is directly emitted onto the first color filter 21 without passing through the optical path directing element, as shown in fig. 6.

Further, the laser light source provided in this embodiment further includes a first stepping motor 301 and a positioning device 302, the light path guiding element 3 is mounted on the positioning device 302, and the first stepping motor 301 is configured to control the positioning device 302, so that the light path guiding element 3 guides the fluorescence of at least one color to be emitted onto the first color filter 21 or the second color filter 22.

In practical implementation, the first stepping motor 301 controls the positioning device 302, and the positioning device 302 drives the first mirror connection 31 of the optical path guiding element 3 to rotate, so that the first mirror 31 is at different angles, in this embodiment, preferably, the first mirror is controlled to be positioned at 45 ° or 0 ° relative to the optical path. Specifically, the positioning device 302 may be a rotating mechanism that rotates the first reflecting mirror 31, and the rotating mechanism may accurately position the angle of the first reflecting mirror 31 at an angle of 45 ° and an angle of 0 °.

Fig. 7 is a schematic structural diagram of a laser projection apparatus according to a second embodiment of the present invention. As shown in fig. 7, the projection apparatus 300 provided in this embodiment includes the laser light source 200 of the first embodiment, and further includes an optical machine 303 and a lens 304. In particular, the laser light source 200 may be used as a projection light source for a laser television or other projection apparatus. After the laser light source emits light, the light is modulated by the optical machine 303, imaging is realized through components such as a lens, and finally an imaging picture is projected onto a curtain or other projection surfaces, so that display of the image picture is completed.

Specifically, when a light source with higher brightness needs to be provided, at this time, the first stepping motor 301 does not operate, and the blue laser light may exit the three-primary-color light source for providing higher brightness through the fluorescent wheel 4, the optical path guiding element 3, and the first color filter 21 on the color filter wheel 2 in sequence. When a light source with high purity but low brightness requirement needs to be provided, the default state needs to be changed, at this time, the first stepping motor 301 is in a working state, and controls the positioning device 302 connected thereto to guide the fluorescence to exit to the second color filter plate by the light path guiding element 3, so that the blue light sequentially passes through the fluorescence wheel 4, the light path guiding element 3 and the second color filter plate 22 on the color filter wheel 2 to exit a three-primary-color light source for improving the high color purity.

The optical machine 303 is configured to receive the laser light source 200 and modulate an output. The optical bench 303 typically includes a Digital Micromirror Device (DMD). The digital micromirror device can modulate the light and image the modulated light through the lens 304. The lens can project the image picture onto the projection screen with a proper focal length, so that the projection display of the image picture on the projection screen is realized.

In addition, the specific structure, function and operation principle of the laser light source 200 adopted in the second embodiment are described in detail in the first embodiment, and are not described herein again, wherein in order to realize the synchronous rotation of the fluorescent wheel 4 and the color filter wheel 2 in the laser light source, the second stepping motor 3011 is further included, and the operations of synchronous rotation, starting, deceleration and the like of the fluorescent wheel 4 and the color filter wheel 2 are realized through the control of the second stepping motor 3011.

Fig. 8 is a schematic step diagram of a laser light source mode switching method according to a third embodiment of the present invention, which is applied to the laser projection apparatus according to the second embodiment.

The laser light source in the laser projection device provided in the second embodiment has two modes, and generally operates in one mode by default when the laser projection device initially operates, so that the laser projection device is switched from the default state to another state when the mode is switched. The specific steps are shown in fig. 8:

s301: receiving a mode switching instruction;

s302: turning off the laser;

s303: the first stepping motor controls the positioning device to enable the light path guide element to guide fluorescence of at least one color to be emitted to the first color filter plate or the second color filter plate;

s304: the laser is started.

Since the subjective experience is affected by abnormal picture color or brightness during the adjustment of the light path guiding element 3 during the mode switching during the viewing process, the laser projection device 300 needs to perform a screen shutdown operation, that is, after receiving the mode switching instruction, the laser 1 is first turned off, so that the fluorescent wheel does not emit fluorescent light, thereby avoiding the situation of abnormal picture color or abnormal brightness. However, at this time, the optical machine 303 is still in a working state, which causes power consumption waste, but the switching mode is simple and easy to operate, and the switching time is short, and a specific switching flow is shown in fig. 8.

Another mode switching method can be the following steps, which avoids power consumption waste caused by the optical machine still working after the light source is cut off, and the specific steps are as follows:

s401: receiving a mode switching instruction;

s402: turning off the laser and turning off the optical machine;

s403: the first stepping motor controls the positioning device to enable the light path guide element to guide at least one color of fluorescence to be emitted to the first color filter plate or the second color filter plate;

s404: the laser and the optical engine are started.

That is, the laser 1 is first turned off, and the optical machine 303 is turned off, wherein the optical machine 303 includes a Digital Micromirror Device (DMD). Since in most projection systems, the input signal is converted into RGB data, the data is sequentially written into a Static Random-Access Memory (SRAM) of the DMD, and the light passing through the color wheel is imaged on the surface of the DMD. When the color filter wheel 2 rotates, light of a first spectral width is obtained by the broad-spectrum fluorescence filtering of the color filter wheel 2, or light of a second spectral width is obtained by the broad-spectrum fluorescence filtering of the color filter wheel 2, wherein the first spectral width is larger than the second spectral width, and is sequentially projected on the DMD. The color wheel and video image are synchronized so that when red light is directed onto the DMD, the tiny mirrors on the DMD are tilted to an "on" state according to the position and intensity at which the red information should be displayed, and similarly, green and blue light. Therefore, if the current frame needs to be switched to the mode, the laser 1 and the optical device 303 need to be turned off first. Then, the positioning device is controlled by the first stepping motor 301, so that the mirror of the light path guiding element 3 is raised or lowered (with a deflection angle of 45 ° or 0 °), so that the light path is reflected by the mirror in the transmission process to change the position of the light spot irradiated on the color filter wheel 2, the time consumed in the process of adjusting the light path guiding element 3 is less than 1 second, the total time consumed in the whole process of mode switching is about 1 second to 2 seconds, the use experience of a user can be met, and a specific working flow diagram is shown in fig. 9.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A laser light source, comprising:

a laser for generating laser light;

a fluorescent wheel for receiving the laser light and exciting at least one color of fluorescent light;

the color filtering wheel rotates synchronously with the fluorescent wheel and comprises a first color filtering plate and a second color filtering plate which are arranged along the radial direction of the color filtering wheel;

the light path guide element is arranged on a light path between the fluorescence wheel and the color filtering wheel and is used for guiding and emitting the fluorescence of at least one color to the first color filtering plate or the second color filtering plate;

the first color filter is used for receiving the fluorescence of the at least one color emitted by the light path guide element and outputting light with a first spectral width; the second color filter is used for receiving the fluorescence of at least one color emitted by the light path guide element and outputting light with a second spectral width; and, the first spectral width is greater than the second spectral width.

2. The laser light source of claim 1, wherein the light of the first spectral width is red light having a spectral width greater than the first range width, or green light having a spectral width greater than the second range width; the light with the second spectral width is red light with the spectral width smaller than the third range width, or green light with the spectral width smaller than the fourth range width.

3. A laser light source as claimed in claim 1 wherein the light of the first spectral width comprises red light of a spectral width greater than the first range width and green light of a spectral width greater than the second range width; the light of the second spectral width comprises red light having a spectral width smaller than the third range width and green light having a spectral width smaller than the fourth range width.

4. The laser light source of claim 3, wherein the fluorescent wheel comprises a fluorescent area and a first transmissive area distributed along an outer circumference, the fluorescent area is configured to receive the laser light and emit fluorescent light of at least one color, and the first transmissive area transmits the laser light.

5. The laser light source according to claim 4, wherein the first color filter and the second color filter are further provided with a second transmission region and a third transmission region in a circumferential direction, respectively, and the laser light emitted from the first transmission region is guided to the second transmission region and the third transmission region by the light path guide element.

6. The laser light source of claim 5, wherein the first color filter is disposed on the outer circumference of the color filter wheel, and the second color filter is disposed inside the first color filter.

7. The laser light source according to claim 6, wherein the optical path directing element comprises a first mirror and a second mirror; wherein the first mirror is positionable at a first angle and a second angle; when the first reflector is at the first angle, the first reflector receives fluorescence of at least one color and reflects the fluorescence to the second reflector, and the second reflector reflects the received fluorescence to the second color filter; when the second reflector is at the second angle, the fluorescence of the at least one color is directly emitted to the first color filter.

8. The laser light source of claim 5, wherein the first, second and third transmissive regions are glass substrates or diffusers.

9. The laser light source according to any one of claims 1 to 8, further comprising a positioning device and a first stepping motor, wherein the light path directing element is mounted on the positioning device, and the first stepping motor is configured to control the positioning device so that the light path directing element directs the at least one color phosphor to emit onto the first color filter or the second color filter.

10. A laser projection apparatus comprising the laser light source of claim 9, further comprising:

the optical machine is used for receiving the laser light source and modulating and outputting;

and the lens is used for receiving the modulated light source output by the light machine for imaging and projecting the modulated light source to a projection screen to form a projection picture.

11. A method for switching modes of a laser light source, which is applied to the laser projection device of claim 10, and is characterized by comprising the following steps:

receiving a mode switching instruction;

turning off the laser;

the first stepping motor controls the positioning device to enable the light path guide element to guide the fluorescence of at least one color to be emitted to the first color filter plate or the second color filter plate;

the laser is started.