CN108535944B

CN108535944B - Laser light source and control method thereof

Info

Publication number: CN108535944B
Application number: CN201810335976.2A
Authority: CN
Inventors: 彭水海
Original assignee: Chengdu Jiutian Optical Technology Co ltd
Current assignee: Chengdu Jiutian Optical Technology Co ltd
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2021-04-13
Anticipated expiration: 2038-04-16
Also published as: CN108535944A

Abstract

The invention discloses a laser light source, comprising: the laser scanning device comprises a laser source, a first light-gathering module, a first diffusion sheet, a first focusing module, a fluorescent powder wheel, a second focusing module, a light bar, a diffusion unit and a light-splitting switch element, wherein when the light-splitting switch element is in a first state, the light-splitting switch element reflects laser used for exciting fluorescent powder from the first diffusion sheet to the second focusing module; in the second state, the beam splitting switching element reflects the laser light from the first diffusion sheet to the second focusing module. The invention also discloses a laser light source control method, which comprises the following steps: step one, adjusting the state of a beam splitting switch element to be a state one; outputting light emitted by the fluorescent powder wheel, or light emitted by the fluorescent powder wheel and obtained after being filtered by a corresponding area of the filtering color wheel or after passing through a second diffusion sheet; step three, adjusting the state of the beam splitting switch element to be a state two; and step four, outputting the light emitted by the laser source. The invention has simple structure, small volume and high optical efficiency, and can be compatible with various light source schemes.

Description

Laser light source and control method thereof

Technical Field

The invention relates to the field of luminous sources, in particular to a laser-based light source for a laser projector.

Background

Compared with the traditional projector, the traditional laser projector has the advantages of long service life, wide color gamut, convenience in maintenance and the like. At present, a single blue laser is generally adopted in a light source part, green and yellow fluorescent powder is excited by the laser to obtain green light and yellow light, and then the yellow light is filtered to obtain red light, so that the light source can output red, yellow, blue and green light or red, blue and green light. For example: document 1, a segmented fluorescent plate laser projector, publication No.: CN206270637U, date of authorized announcement: 2017.06.20. however, the use of a monochromatic light source has a problem: the red light is not bright enough, and the blue laser excites the yellow light to be filtered by the filter plate to obtain the red light, so that the light conversion efficiency is very low, and the red light is darker and has unclear gradation when the video and the picture are integrally displayed.

Therefore, a separate red laser source is added to the above blue laser source to compensate for the above problem. But the structure complexity is obviously improved, and the volume is also obviously increased. For example: document 2, a two-color laser light source projector, no: CN206224129U, date of authorized announcement: 2017.06.06, respectively; document 3, a two-color laser fluorescent wheel projector, bulletin No.: CN206270638U, date of authorized announcement: 22017.06.20, respectively; document 4, a two-color laser light source, publication No.: CN105093795A, date of authorized announcement: 2015.11.25. in these solutions, either 4 or more mirrors are used, or different sets of mirrors are used for different lasers or fluorescent lights, which results in larger size and higher cost.

The market is the scheme which adopts a three-color laser light source, the color and the brightness are good, but the structure is complex, the volume is large, and the cost is high. For example: document 5, laser projector, bulletin No.: CN 101067683A; the publication date is as follows: 2007.11.07, respectively; document 6, light source device, publication No.: CN107145029A, date of authorized announcement: 2017.09.08.

there is still room for improvement in existing laser light sources. The three light source schemes have the following problems except that the structure is complex, the number of optical lenses is large, the corresponding cost is high, and the volume is large:

1. the structure is complex, and the number of lenses (including the reflecting mirror) is large, so that the optical path is long, and the optical efficiency is low;

2. the interchangeability between the three light source schemes (monochromatic, bicolor and three laser light sources) is poor, and the addition or reduction of the laser light sources may necessitate the addition or reduction of corresponding overall structures, such as a reflector, a lens system corresponding to the laser, and the like, and additional preparation of a mold is required, so that the production cost is increased.

In order to solve the above-mentioned drawbacks of the prior art, the present invention proposes a new solution.

Disclosure of Invention

The invention aims to solve the following problems of the existing three types of laser light sources:

1. the structure is more complex and the volume is larger;

2. the cost is higher due to more optical lenses;

3. the optical lens is more, and particularly needs multiple reflections, so the optical path is longer, and the optical efficiency is lower;

4. the three types of laser light source structures are very different from each other and are incompatible with each other, and a die needs to be developed independently, so that the development cost is increased.

The technical problem proposed by the invention is solved as follows: there is provided a laser light source including:

a laser source for providing one, two or more colors of laser light;

the first light-gathering module is used for collimating and compressing laser emitted by the laser source and projecting the laser onto a first diffusion sheet;

the first diffusion sheet is used for eliminating laser speckles, and meanwhile, light spots reaching the fluorescent powder wheel are uniform, and the fluorescence excitation efficiency is high;

the first focusing module is used for converging and projecting the laser received from the first diffusion sheet to the fluorescent powder wheel, and meanwhile, converging and projecting the excited fluorescent light on the fluorescent powder wheel to the second focusing module;

the fluorescent powder wheel is divided into one, two or more fluorescent powder areas, wherein at least one fluorescent powder area emits fluorescence after being excited by laser;

the second focusing module is used for further combining the light beams and projecting the light beams to the diffusion unit;

the light bar is used for carrying out light homogenizing action on the light beam;

further comprising:

the diffusion unit is a color filter wheel or a vibrating or rotating second diffusion sheet, the color filter wheel is divided into two or more areas, wherein at least diffusion sheet areas with the number corresponding to the laser color number of the laser source are arranged, diffusion sheets in the diffusion sheet areas are respectively plated with antireflection films corresponding to the laser colors, the diffusion sheet areas are used for further eliminating laser speckles, and the rest areas are made of white glass, optical filters with corresponding colors or hollow parts; the second diffusion sheet is used for eliminating speckles of laser and transmitting fluorescence of other colors;

a spectral switching element that reflects laser light of a color matching that of the laser light source and transmits light of other colors;

the beam-splitting switch element has two states, namely a state one and a state two,

when the state is first, the light splitting switch element reflects laser used for exciting fluorescent powder from the first diffusion sheet to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel, fluorescent powder areas on the fluorescent powder wheel excite fluorescent powder with corresponding colors, the fluorescent powder is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element, the fluorescent powder focused by the second focusing module passes through the second diffusion sheet or a light filter, a white glass area or hollow out of the color filter wheel with the corresponding colors, and finally the fluorescent powder is projected to the light bar;

and in the second state, the beam-splitting switch element reflects the laser from the first diffusion sheet to the second focusing module, the laser focused by the second focusing module passes through the diffusion sheet plated with the anti-reflection film corresponding to the color on the color filter wheel and irradiates the light bar.

Further, the beam splitting switch element is a dichroic mirror which can rotate and be positioned to at least two angles, the dichroic mirror reflects laser light with the color matched with that of the laser source and transmits light with other colors;

and in at least two angles at which the dichroic mirror is positioned, one angle corresponds to the state I, and the other angle corresponds to the state II.

Further, the laser source is used for providing blue laser;

the light splitting switch element reflects blue laser and transmits other color light; when the state is first, the light splitting switch element reflects laser used for exciting fluorescent powder from the first diffusion sheet to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel, a fluorescent powder area on the fluorescent powder wheel excites fluorescent light with corresponding colors, the fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element, the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a light filter, a white glass area or hollow part with corresponding colors on the color filter wheel, and finally is projected to the light bar; when the laser light is in the second state, the light splitting switch element reflects the laser light from the first diffusion sheet to the second focusing module, the laser light is focused by the second focusing module, and the laser light passes through the second diffusion sheet or the diffusion sheet plated with the anti-reflection film corresponding to the color on the color filter wheel and irradiates the light bar;

the fluorescent powder wheel comprises two fluorescent powder areas, wherein the first fluorescent powder area is a green fluorescent powder area, and the second fluorescent powder area is a yellow fluorescent powder area;

when the diffusion unit is arranged as the color filtering color wheel, the color filtering color wheel comprises four areas, wherein the first area is arranged as a red filter, and the second area is arranged as a green filter or white glass; the third area is set as a diffusion sheet area, and the diffusion sheet in the area is plated with an antireflection film which can transmit blue light and reflect other color light; the fourth area is arranged as white glass and is used for passing yellow fluorescence;

when the diffusion unit is arranged as the second diffusion sheet, the second diffusion sheet vibrates or rotates in the vertical direction or multiple directions, and is used for eliminating the speckles of the laser.

Furthermore, the fluorescent powder wheel also comprises a third fluorescent powder area, and the third fluorescent powder area is a red fluorescent powder area;

the first area is arranged as a red filter or white glass.

Further, the laser source provides blue laser and red laser;

the light splitting switch element reflects blue laser and red laser and transmits other color light; when the state is first, the light splitting switch element reflects blue laser used for exciting fluorescent powder from the first diffusion sheet to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel, fluorescent powder areas on the fluorescent powder wheel excite fluorescent light with corresponding colors, the fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element, the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a light filter, a white glass area or hollow of the color filter wheel with corresponding colors, and finally is projected to the light bar; when the laser is in the second state, the light splitting switch element reflects the blue laser or the red laser from the first diffusion sheet to the second focusing module, the laser focused by the second focusing module passes through the second diffusion sheet or a diffusion sheet plated with an anti-reflection film corresponding to the color on the color filtering wheel to irradiate the light bar;

the fluorescent powder wheel comprises two areas, wherein the first fluorescent powder area is a green fluorescent powder area, and the second fluorescent powder area is a yellow fluorescent powder area;

when the diffusion unit is set as the color filtering wheel, the color filtering wheel comprises four areas, the first area is set as a diffusion sheet area, and a diffusion sheet in the area is plated with an antireflection film which can transmit red light and reflect other color light; the second area is set as a green filter or white glass; the third area is set as a diffusion sheet area, and the diffusion sheet in the area is plated with an antireflection film which can transmit blue light and reflect other color light; the fourth area is arranged as white glass and is used for passing yellow fluorescence;

Further, the laser source provides blue laser, red laser and green laser;

the fluorescent powder wheel comprises a fluorescent powder area, and the first fluorescent powder area is a yellow fluorescent powder area;

the light splitting switch element reflects blue laser, red laser and green laser and transmits other color light; when the state is first, the light splitting switch element reflects blue laser used for exciting fluorescent powder from the first diffusion sheet to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel, yellow fluorescent light is excited in a fluorescent powder area on the fluorescent powder wheel, the yellow fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element, and the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a fourth area on the color filtering wheel and is finally projected to the light bar; when the laser is in the second state, the light splitting switch element reflects the blue laser, the red laser or the green laser from the first diffusion sheet to the second focusing module, the laser focused by the second focusing module passes through the second diffusion sheet or a diffusion sheet plated with an anti-reflection film corresponding to the color on the color filtering wheel to irradiate the light bar;

when the diffusion unit is set as the color filtering wheel, the color filtering wheel comprises four areas, the first area is set as a diffusion sheet area, and a diffusion sheet in the area is plated with an antireflection film which can transmit red light and reflect other color light; a second diffusion sheet area, wherein the diffusion sheet in the second diffusion sheet area is plated with an anti-reflection film which transmits green light and reflects other color light; the third area is set as a diffusion sheet area, and the diffusion sheet in the area is plated with an antireflection film which can transmit blue light and reflect other color light; the fourth area is arranged in white glass or hollow and is used for passing yellow fluorescence;

The invention also provides a control method of the laser light source, which comprises the following steps:

step one, adjusting the state of the beam-splitting switch element to be a state one: when the light which needs to be output by the laser light source is from the fluorescent powder wheel or light which is from the fluorescent powder wheel and is obtained after being filtered by the area corresponding to the color filtering wheel or the second diffusion sheet, the light splitting switch element is controlled to be kept in a state I, and blue laser from the first diffusion sheet is reflected to the first focusing module;

outputting light emitted by the fluorescent powder wheel, or light emitted by the fluorescent powder wheel and obtained after being filtered by a region corresponding to the color filtering wheel or after passing through a second diffusion sheet: the fluorescent powder wheel rotates to output one, two or more kinds of fluorescent light, the fluorescent light sequentially passes through the first focusing module, the first diffusion sheet, the light splitting switch element and the second focusing module, is projected to a corresponding area of the color filter wheel or the second diffusion sheet synchronously rotating with the fluorescent powder wheel, and is finally projected to the light bar to realize output;

step three, adjusting the state of the beam splitting switch element to be a state two: when the laser light source needs to output light which is directly from a laser source and is obtained after passing through a diffusion sheet area corresponding to a color filter wheel or after passing through a second diffusion sheet, the light-splitting switch element is controlled to be kept in a second state, and laser of one, two or more colors from the first diffusion sheet is reflected to the second focusing module;

step four, outputting light emitted by the laser source: the light splitting switch element reflects the laser light of one, two or more colors from the first diffusion sheet to the second focusing module, and the laser light is projected to a light bar to realize output after passing through a color filtering wheel or a second diffusion sheet which just rotates to align the region of the corresponding diffusion sheet with the second focusing module.

Further, the control method of the laser light source comprises the following steps:

step one, adjusting the state of the beam-splitting switch element to be a state one: when the laser light source needs to output yellow, red and green light respectively, the light splitting switch element is controlled to be kept in a first state, and blue laser from the first diffusion sheet is reflected to the first focusing module;

step two, outputting yellow light: the fluorescent powder wheel rotates right to align the second fluorescent powder area with the first focusing module at the moment, and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light sequentially passes through the first focusing module, the light splitting switch element, the second focusing module and a color filtering wheel or a second diffusion sheet which rotates right to align the fourth area with the second focusing module, and then is projected to the light bar to output yellow light;

step three, outputting red light: although the fluorescent powder wheel rotates, the second fluorescent powder area is still aligned to the first focusing module at the moment and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light passes through the first focusing module, the light splitting switch element, the second focusing module and the color filtering wheel which just rotates to align the first area to the second focusing module in sequence, and then red light is filtered by yellow light and projected to the light bar to output red light; when the second diffusion sheet is adopted, the fluorescent powder wheel further comprises a third fluorescent powder area, the third fluorescent powder area is a red fluorescent powder area, and red fluorescence excited in the third fluorescent powder area is projected to the light bar through the first diffusion sheet of the first focusing module, the light splitting switch element, the second focusing module and the second diffusion sheet in sequence to output red light;

step four, outputting green light: the fluorescent powder wheel continues to rotate, the first fluorescent powder area is aligned to the first focusing module, the first fluorescent powder area is excited by blue laser to emit green fluorescent light, and the green fluorescent light sequentially passes through the first diffusion sheet of the first focusing module, the beam splitting switch element, the second focusing module and the color wheel or the second diffusion sheet which just rotates to align the second area to the second focusing module, and then is projected to the light bar to output green light;

step five, adjusting the state of the beam splitting switch element to be a state two: when the laser light source needs to output blue light, the state one of the beam splitting switch element is adjusted to the state two;

step six, outputting blue light: the light splitting switch element reflects the blue laser from the first diffusion sheet to the second focusing module, and the blue laser is projected to a light bar to output blue light after the blue laser just rotates to a color filtering wheel or a second diffusion sheet which is aligned to the second focusing module by a third area;

step seven, returning to the step one, and sequentially carrying out the subsequent steps; the circulation realizes that the laser light source sequentially outputs yellow, red, green and blue light.

step one, adjusting the state of the beam-splitting switch element to be a state one: when the laser light source needs to output yellow light and green light respectively, the light splitting switch element is controlled to be kept in a first state, and blue laser from the first diffusion sheet is reflected to the first focusing module;

step three, outputting green light: the fluorescent powder wheel continues to rotate, the first fluorescent powder area is aligned to the first focusing module, the first fluorescent powder area is excited by blue laser to emit green fluorescent light, and the green fluorescent light sequentially passes through the first diffusion sheet of the first focusing module, the beam splitting switch element, the second focusing module and the color wheel or the second diffusion sheet which just rotates to align the second area to the second focusing module, and then is projected to the light bar to output green light;

step four, adjusting the state of the beam splitting switch element to be a state two: when the laser light source needs to output red light and blue light respectively, the state one of the light splitting switch element is adjusted to the state two;

step five, outputting red light: the laser source emits red laser, the light splitting switch element reflects the red laser from the first diffusion sheet to the second focusing module, and the red laser is projected to the light bar to output red light after rotating right to a color filtering color wheel or a second diffusion sheet which is aligned to the second focusing module by a first area;

step six, outputting blue light: the laser source emits blue laser, the light splitting switch element reflects the blue laser from the first diffusion sheet to the second focusing module, and the blue laser is projected to the light bar to output blue light after rotating right to a color filtering color wheel or a second diffusion sheet which is aligned to the second focusing module by a third area;

step seven, returning to the step one, and sequentially carrying out the subsequent steps; the circulation realizes that the laser light source sequentially outputs yellow, green, red and blue light.

step one, adjusting the state of the beam-splitting switch element to be a state one: when the laser light source needs to output yellow light, the light splitting switch element is controlled to be kept in a first state, and blue laser from the first diffusion sheet is reflected to the first focusing module;

step two, outputting yellow light: the fluorescent powder wheel rotates right to align the first fluorescent powder area with the first focusing module at the moment, and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light sequentially passes through the first focusing module, the light splitting switch element, the second focusing module and a color filtering wheel or a second diffusion sheet which rotates right to align the fourth area with the second focusing module, and then is projected to the light bar to output yellow light;

step three, adjusting the state of the beam splitting switch element to be a state two: when the laser light source needs to output red light, green light and blue light respectively, the state one of the light splitting switch element is adjusted to the state two;

step four, outputting red light: the laser source emits red laser, the light splitting switch element reflects the red laser from the first diffusion sheet to the second focusing module, and the red laser is projected to the light bar to output red light after rotating right to a color filtering color wheel or a second diffusion sheet which is aligned to the second focusing module by a first area;

step five, outputting green light: the laser source emits green laser, the light splitting switch element reflects the green laser from the first diffusion sheet to the second focusing module, and the green laser is projected to the light bar to output green light after rotating right to a color filtering color wheel or a second diffusion sheet which is aligned to the second focusing module by a second area;

The invention has the following advantages:

1. simple structure, the volume dwindles: (1) compared with the existing laser light source, the rectangular light path formed by multiple reflections is not needed, so that the number of the reflecting mirrors is reduced at least, and the volume required for forming the rectangular light path is correspondingly reduced (for example, documents 1 to 6); (2) although the quality of each color laser and fluorescence is guaranteed by processing through the corresponding optical elements (each color laser or fluorescence is subjected to complete and matched optical processing through the corresponding area on the color filter wheel), because the number of optical paths and parts which are processed by adopting one to three laser sources is the same, compared with a laser light source which is used for independently processing each color laser in a shunting way, the lens system corresponding to shunting processing is simplified, and the processing quality is guaranteed (for example, documents 2 and 5).

2. Saving optical lenses, thus saving costs: the structure is simplified, and the use of a reflector and/or other lenses is correspondingly reduced, so that the cost is saved;

3. the optical path is shortened, thereby improving the optical efficiency: the reflection times are reduced, and the optical path is shortened, so that the optical efficiency is improved;

4. as the number of light paths and parts of one to three laser sources is the same, the total structure does not need to be changed only by modifying the color number setting of the laser sources, the subarea setting of the fluorescent powder wheel and the subarea setting of the color filter wheel, and therefore, various light source schemes can be compatible, which has important significance for practical production and can be greatly compatible with various machine types, thereby reducing the development cost of the die (generally 30-100 ten thousand).

Drawings

FIG. 1 is a schematic block diagram and schematic diagram of state one of the first embodiment of the present invention;

FIG. 2 is a schematic structural diagram and a schematic diagram of state two of the first embodiment of the present invention;

FIG. 3 is a schematic structural and schematic diagram of state one of embodiment two of the present invention;

FIG. 4 is a schematic structural diagram and a schematic diagram of state two of the second embodiment of the present invention;

FIG. 5 is a schematic structural and schematic diagram of state one of a third embodiment of the present invention;

FIG. 6 is a schematic structural diagram and a schematic diagram of state two of the third embodiment of the present invention;

FIG. 7 is a schematic diagram of the structure of one embodiment of the phosphor wheel 8 in the first and second embodiments of the present invention (green and yellow phosphor regions are provided);

FIG. 8 is a schematic view of the structure of another embodiment of the phosphor wheel 8 in the first and second embodiments of the present invention (red, green and yellow phosphor regions are provided);

FIG. 9 is a schematic structural diagram of an embodiment of a phosphor wheel 8 according to a third embodiment of the present invention (only yellow phosphor regions are provided);

fig. 10 is a schematic structural diagram of one embodiment of a color filtered wheel 10 (with three regions, for the case of no yellow fluorescent output) according to embodiments one, two and three of the present invention;

fig. 11 is a schematic structural diagram of another embodiment of a color filtered wheel 10 according to embodiments one, two and three of the present invention (with four regions, for the case of yellow fluorescent output);

it should be noted that the number, position and angle of the circumference of the circle shown in the figure of each area of the phosphor wheel and the color filter wheel are only used as reference, and are determined according to actual requirements, but the areas of the phosphor wheel and the color filter wheel are matched with each other.

Wherein the content of the first and second substances,

a laser light source (1); a first concentrator module, comprising: a collimating lens (2) and a compression lens (3); a first diffusion module comprising: a first diffusion sheet (4); a spectroscopic switch element (5); a first focusing module; a first focusing lens (6); a second focusing lens (7); a phosphor wheel (8); a second focusing module: a third focusing lens (9); a color filter wheel (10); a light bar (11).

Detailed Description

The invention will be further described with reference to the accompanying drawings.

Example one

As shown in fig. 1 and 2, the laser light source includes: the device comprises a laser source (1), a first light-gathering module, a first diffusion sheet (4), a first focusing module, a light-splitting switch element (5), a second focusing module, a diffusion unit and a light rod (11).

A laser source (1) for providing blue laser light.

The first light-gathering module is used for collimating and compressing the laser emitted by the laser source (1) and projecting the laser onto the first diffusion sheet (4). In this embodiment, the first light-gathering module includes a collimating lens (2) and a compressing lens (3) for collimating light and compressing the light, respectively.

The first diffusion sheet (4) is used for eliminating laser speckles, enabling light spots reaching the fluorescent powder wheel (8) to be uniform and enabling fluorescence excitation efficiency to be high.

The first focusing module is used for converging the laser received from the first diffusion sheet (4) and projecting the laser to the fluorescent powder wheel (8), and meanwhile, converging and projecting the excited fluorescent light on the fluorescent powder wheel (8) to the second focusing module. In the embodiment, the first focusing module is composed of a first focusing lens (6) and a second focusing lens (7), and one lens can also be adopted.

As shown in fig. 7, the phosphor wheel (8) includes two regions, a first phosphor region (8a) being a green phosphor region, and a second phosphor region (8b) being a yellow phosphor region;

a spectral switching element (5) that reflects blue laser light and transmits light of another color; the spectral switching element (5) has two states, namely a state one and a state two. The beam splitting switching element (5) may in this embodiment be selected as a dichroic mirror rotatable and positionable to at least two angles, the dichroic mirror reflecting blue laser light and transmitting other color light. And in at least two angles at which the dichroic mirror is positioned, one angle corresponds to the state I, and the other angle corresponds to the state II.

When the state is first, the dichroic mirror reflects laser used for exciting fluorescent powder from the first diffusion sheet (4) to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel (8), fluorescent powder areas on the fluorescent powder wheel (8) excite fluorescent light with corresponding colors, the fluorescent light is focused by the first focusing module and projects to the second focusing module through the dichroic mirror, and the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a light filter, a white glass area or hollow out of the color filter wheel (10) and corresponding colors, and finally projects to the light bar (11).

And in the second state, the light splitting switch element (5) reflects the laser from the first diffusion sheet (4) to the second focusing module, the laser focused by the second focusing module passes through the second diffusion sheet or the diffusion sheet coated with the anti-reflection film with the corresponding color on the color filtering wheel (10) and irradiates to the light bar (11).

And a second focusing module for further combining the light beams and projecting the light beams to a color filter wheel (10). In this embodiment, the second focusing module is a third focusing lens (9).

And the diffusion unit is a color filter wheel (10) or a second diffusion sheet vibrating or rotating in the vertical direction or multiple directions.

The second diffusion sheet is used for eliminating speckles of laser, and meanwhile, the second diffusion sheet penetrates through fluorescence of other colors, so that the second diffusion sheet is applied to occasions with low color requirements, or the situation that filtering is not needed when the laser source (1) provides laser light sources of three colors, namely red, green and blue. The second diffusion sheet is rotated or vibrated to realize the dynamic elimination of the speckles. The first diffusion sheet 4 is stationary and has a limited effect of eliminating speckles.

As shown in fig. 10, the color filtering wheel (10) may include three regions, a first region (10a) is configured as a red filter, and a second region (10b) is configured as a green filter, white glass or hollow; the third area (10c) is set as a diffusion sheet area, and the diffusion sheet of the area is plated with an antireflection film which transmits blue light and reflects other color light.

As shown in fig. 11, preferably, in order to increase the brightness, yellow light needs to be output, and the color filter wheel (10) further includes a fourth region (10d), and the fourth region (10d) is configured as white glass or hollow for passing yellow fluorescence.

The dichroic mirror is also capable of transmitting light of other wavelengths in the visible range, since the wavelength range of the laser light is relatively small. In practical use, if only three colors of red, green and blue are used, the overall luminous flux is low although the color is good. And after yellow light is added, the luminous flux of the white screen can be greatly improved. Therefore, it is preferable to still use the yellow phosphor to obtain yellow light of a broad spectrum of high energy and output the yellow light.

In this embodiment, since the laser light source outputs yellow and green light, the dichroic switch element (5) is in the first state, outputs red and blue light, and the dichroic switch element (5) is in the second state. In order to avoid frequent switching states, the first region (10a) and the third region (10c) are arranged adjacently, and the second region (10b) and the fourth region (10d) are arranged adjacently.

At this time, the positions and angles on the circumference of the first region (10a) and the fourth region (10d) correspond to the positions and angles on the circumference of the second phosphor region (8 b).

The position and angle of the first region (10a) on the circumference correspond to the position and angle of the second phosphor region (8b) on the circumference. The position of the second region (10b) on the circumference and the angle on the circumference correspond to the first phosphor region (8 a).

And the light bar (11) is used for carrying out light homogenizing action on the light beam. At any time during the operation of the laser light source, the light bar (11) only receives light of one color.

As shown in fig. 8, optionally, the phosphor wheel (8) further includes a third phosphor region (8c), and the third phosphor region (8c) is a red phosphor region;

at this time, the first region (10a) is provided as a red filter, white glass, or hollow.

When the red fluorescent powder is excited, the temperature is high, the efficiency is low, and the red fluorescent powder is easy to crack. And thus as an alternative.

The laser light source can be regarded as a point light source, and is emitted after being collimated, some are collimated by itself, and some are additionally collimated. The light emitted to the upper part of the first light-gathering module is regarded as parallel light.

It should be noted that the number, position and angle of the area of the phosphor wheel and the color filter wheel (10) on the circle shown in the figure are only used as reference, and are determined according to the actual requirement, but the areas of the phosphor wheel and the color filter wheel (10) are matched with each other.

[ CONTROL METHOD ]

[ control method one (A) ]

The first control method (a) is based on the laser light source structure described in the first embodiment, and adopts a color filter wheel (10), taking the example that the laser light source sequentially outputs yellow, red, green and blue light. Wherein the content of the first and second substances,

1. the fluorescent powder wheel (8) is only provided with two areas, the first fluorescent powder area (8a) is a green fluorescent powder area, and the second fluorescent powder area (8b) is a yellow fluorescent powder area;

2. the color filtering color wheel (10) is provided with four areas, a first area (10a) is set as a red filter, a second area (10b) is set as a green filter, white glass or hollow, a third area (10c) is set as a diffusion sheet area, an antireflection film which penetrates through blue light and reflects other color light is plated on a diffusion sheet in the area, and a fourth area (10d) is set as white glass or hollow and is used for allowing yellow fluorescence to pass through;

3. the fluorescent powder wheel (8) and the color filtering wheel (10) rotate synchronously;

4. the number, the positions and the angles of the first fluorescent powder areas (8a) and the second areas (10b) on the circumference are matched with each other;

5. the second fluorescent powder area (8b) is respectively matched with the number, the position and the occupied angle on the circumference of the first area (10a) and the fourth area (10d), namely, the number and the occupied angle on the circumference of the first area (10a) and the fourth area (10d) correspond to the total number and the total angle on the circumference of the second fluorescent powder area (8b) except the position of the second fluorescent powder area (8 b).

[ METHOD ] A control method (A) comprising the steps of:

step one, adjusting the state of the beam-splitting switch element (5) to be a state one: when the laser light source needs to output yellow, red and green light respectively, the light splitting switch element (5) is controlled to be kept in a state I, and blue laser from the first diffusion sheet (4) is reflected to the first focusing module;

step two, outputting yellow light: the fluorescent powder wheel (8) rotates right to align the second fluorescent powder area (8b) with the first focusing module at the moment, and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light sequentially passes through the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering wheel (10) which rotates right to align the fourth area (10d) with the second focusing module, and then is projected to the light bar (11) to output yellow light;

step three, outputting red light: although the fluorescent powder wheel (8) rotates, the second fluorescent powder area (8b) is still aligned to the first focusing module at the moment and is excited by blue laser to emit yellow fluorescent light, the yellow fluorescent light passes through the first focusing module, the light splitting switch element (5), the second focusing module and the color filter wheel (10) which just rotates to align the first area (10a) to the second focusing module in sequence, and then red light is filtered by yellow light and projected to the light bar (11) to output red light;

step four, outputting green light: the fluorescent powder wheel (8) continues to rotate, and is aligned to the first focusing module by the first fluorescent powder area (8a), the first fluorescent powder area (8a) is excited by blue laser to emit green fluorescent light, the green fluorescent light sequentially passes through the first diffusion sheet (4) of the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering wheel (10) which just rotates to align to the second focusing module by the second area (10b), and then is projected to the light bar (11) to output green light;

step five, adjusting the state of the beam-splitting switch element (5) to be a state two: when the laser light source needs to output blue light, the beam splitting switch element (5) is adjusted from the first state to the second state;

step six, outputting blue light: the light-splitting switch element (5) reflects the blue laser from the first diffusion sheet (4) to the second focusing module, and then projects the blue laser to a light bar (11) after rotating to a color filtering wheel (10) which is aligned to the second focusing module by a third area (10c) to output blue light;

step seven, returning to the step one, and sequentially carrying out the subsequent steps; the purpose that the laser light source sequentially outputs yellow, red, green and blue light is achieved through the circulation.

[ control method one (B) ]

The control method I (B), on the basis of the control method I (A) and the product embodiment based on the control method I (A), the color filtering color wheel (10) is replaced by a second diffusion sheet, and the rest is not changed.

[ METHOD ] the control method one (B) and the control method one (A) are different in that: in steps two to four, and six, all colors of light from the second focusing module are projected to the light bar (11) through the second diffusion sheet.

Example two

As shown in fig. 3 and 4, the second embodiment is based on the first embodiment, and the difference between the first embodiment and the second embodiment is:

the laser source (1) provides red laser light in addition to blue laser light;

the light-splitting switch element (5) reflects blue laser light and red laser light and transmits other color light; when the state is first, the light splitting switch element (5) reflects blue laser used for exciting fluorescent powder from the first diffusion sheet (4) to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel (8), a fluorescent powder area on the fluorescent powder wheel (8) excites fluorescent light with corresponding color, the fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element (5), the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a filter, a white glass area or hollow of the corresponding color on the color filtering wheel (10), and finally is projected to the light bar (11); when the laser is in the second state, the light splitting switch element (5) reflects the blue laser or the red laser from the first diffusion sheet (4) to the second focusing module, the laser focused by the second focusing module passes through the second diffusion sheet or a diffusion sheet plated with an anti-reflection film corresponding to the color on the color filtering wheel (10) and irradiates a light bar (11);

as shown in fig. 11, when the diffusion unit is configured as a color filter wheel (10), the color filter wheel (10) includes four regions, a first region (10a) is configured as a diffusion sheet region, and a diffusion sheet of the region is plated with an antireflection film that transmits red light and reflects light of other colors; the second region (10b), the third region (10c) and the fourth region (10d) are the same as in the first embodiment;

when the diffusion unit is the second diffusion sheet, the same as the first embodiment is performed.

[ control method two (A) ]

A second control method (a), based on the laser light source structure described in the second embodiment, employs a color filter wheel (10), taking as an example that the laser light source sequentially outputs yellow, green, red, and blue light. Wherein the content of the first and second substances,

1. the fluorescent powder wheel (8) and the color filtering wheel (10) rotate synchronously;

2. the number, the positions and the angles of the first fluorescent powder areas (8a) and the second areas (10b) on the circumference are matched with each other;

3. the number, the position and the angle occupied on the circumference of the second fluorescent powder region (8b) and the fourth region (10d) are matched with each other.

The second control method (a) comprises the following steps:

step one, adjusting the state of the beam-splitting switch element (5) to be a state one: when the laser light source needs to output yellow light and green light respectively, the light splitting switch element (5) is controlled to be kept in a first state, and blue laser from the first diffusion sheet (4) is reflected to the first focusing module;

step three, outputting green light: the fluorescent powder wheel (8) continues to rotate, and is aligned to the first focusing module by the first fluorescent powder area (8a), the first fluorescent powder area (8a) is excited by blue laser to emit green fluorescent light, the green fluorescent light sequentially passes through the first diffusion sheet (4) of the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering wheel (10) which just rotates to align to the second focusing module by the second area (10b), and then is projected to the light bar (11) to output green light;

step four, adjusting the state of the beam splitting switch element (5) to be a state two: when the laser light source needs to output red light and blue light respectively, the state one of the light splitting switch element (5) is adjusted to the state two;

step five, outputting red light: the laser source (1) emits red laser, the light splitting switch element (5) reflects the red laser from the first diffusion sheet (4) to the second focusing module, and the red laser is projected to a light bar (11) to output red light after rotating right to a color filtering color wheel (10) which is aligned to the second focusing module by a first area (10 a);

step six, outputting blue light: the laser source (1) emits blue laser, the light splitting switch element (5) reflects the blue laser from the first diffusion sheet (4) to the second focusing module, and the blue laser is projected to a light bar (11) to output blue light after rotating to a color filtering color wheel (10) which is aligned to the second focusing module by a third area (10 c);

step seven, returning to the step one, and sequentially carrying out the subsequent steps; the purpose that the laser light source sequentially outputs yellow, green, red and blue light is achieved through the circulation.

[ control method two (B) ]

The second control method (B) and the second diffusion sheet are replaced by the color filtering color wheel (10) on the basis of the second control method (A) and the product embodiment based on the second control method, and the rest of the color filtering color wheel is not changed.

The difference between the control method two (B) and the control method two (a) is that: in steps two, three, five and six, all colors of light from the second focusing module are projected to the light bar (11) through the second diffuser.

EXAMPLE III

As shown in fig. 3 and 4, the second basic embodiment of the third embodiment is different from the second embodiment in that:

the laser source (1) provides green laser besides blue laser and red laser;

the light-splitting switch element (5) reflects blue laser, red laser and green laser and transmits other color light; when the state is first, the light splitting switch element (5) reflects blue laser which is used for exciting fluorescent powder and from the first diffusion sheet (4) to the first focusing module, the laser irradiates the fluorescent powder wheel (8) after being focused by the first focusing module, a fluorescent powder area on the fluorescent powder wheel (8) excites yellow fluorescent light, the yellow fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element (5), the fluorescent light focused by the second focusing module passes through a light filter, a white glass area or hollow-out of the second diffusion sheet or the color filter wheel (10) and corresponding to the color, and is finally projected to the light bar (11); when the laser is in the second state, the light splitting switch element (5) reflects blue laser, red laser or red laser from the first diffusion sheet (4) to the second focusing module, the laser focused by the second focusing module passes through the second diffusion sheet or a diffusion sheet coated with an anti-reflection film corresponding to the color on the color filtering wheel (10) and irradiates a light bar (11);

as shown in fig. 9, the phosphor wheel (8) includes only one region, the first phosphor region (8a) being a yellow phosphor region;

as shown in fig. 11, when the diffusion unit is provided as the color filter wheel (10), the color filter wheel (10) includes four regions, and the first region (10a), the third region (10c), and the fourth region (10d) are the same as those of the embodiment; and a second area (10b) diffuser area coated with an anti-reflection film that transmits green light and reflects other colors of light.

When the diffusion unit is the second diffusion sheet, the same as the embodiment is performed.

[ CONTROL METHOD III (A) ]

A third control method (a) is based on the laser light source structure described in the third embodiment, and a color filter wheel (10) is adopted, taking the example that the laser light source sequentially outputs yellow, red, green and blue light.

Step one, adjusting the state of the beam-splitting switch element (5) to be a state one: when the laser light source needs to output yellow light, the light splitting switch element (5) is controlled to be kept in a state I, and blue laser from the first diffusion sheet (4) is reflected to the first focusing module;

step two, outputting yellow light: the fluorescent powder wheel (8) rotates right to align the first fluorescent powder area (8a) with the first focusing module at the moment, and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light sequentially passes through the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering wheel (10) which rotates right to align the fourth area (10d) with the second focusing module, and then is projected to the light bar (11) to output yellow light;

step three, adjusting the state of the beam splitting switch element (5) to be a state two: when the laser light source needs to output red light, green light and blue light respectively, the light splitting switch element (5) is adjusted from the first state to the second state;

step four, outputting red light: the laser source (1) emits red laser, the light splitting switch element (5) reflects the red laser from the first diffusion sheet (4) to the second focusing module, and the red laser is projected to a light bar (11) to output red light after rotating right to a color filtering color wheel (10) which is aligned to the second focusing module by a first area (10 a);

step five, outputting green light: the laser source (1) emits green laser, the light splitting switch element (5) reflects the green laser from the first diffusion sheet (4) to the second focusing module, and the green laser is projected to the light bar (11) to output green light after rotating right to a color filtering color wheel (10) which is aligned to the second focusing module by a second area (10 b);

[ CONTROL METHOD III (B) ]

The third control method (B) and the third control method (A) and the product embodiment based on the third control method (B) replace the color filtering color wheel (10) with a second diffusion sheet, and the rest are not changed.

[ METHOD ] the difference between the control method III (B) and the control method III (A) is that: in steps two and four to six, all colors of light from the second focusing module are projected to the light bar (11) through the second diffusion sheet.

The invention is described above in further detail by means of the embodiments shown in the drawings, which are given by way of illustration of the invention described above, but it should not be understood that the scope of the subject matter described above is limited to the examples described.

Claims

1. A laser light source comprising:

a laser source (1) for providing one, two or more colors of laser light;

the first light-gathering module is used for collimating and compressing laser emitted by the laser source (1) and projecting the laser onto the first diffusion sheet (4);

the first diffusion sheet (4) is used for eliminating laser speckles, enabling light spots reaching the fluorescent powder wheel (8) to be uniform and enabling fluorescence excitation efficiency to be high;

the first focusing module is used for converging the laser received from the first diffusion sheet (4) and projecting the laser to the fluorescent powder wheel (8), and meanwhile, the first focusing module is used for converging and projecting the excited fluorescent light on the fluorescent powder wheel (8) to the second focusing module;

the fluorescent powder wheel (8) is divided into one, two or more fluorescent powder areas, wherein at least one fluorescent powder area emits fluorescence after being excited by laser;

the light bar (11) is used for carrying out light homogenizing action on the light beam;

the method is characterized in that: further comprising:

the diffusion unit is a color filter wheel (10) or a vibrating or rotating second diffusion sheet, the color filter wheel (10) is divided into two or more areas, wherein at least diffusion sheet areas with the number corresponding to the laser color number of the laser source (1) are arranged, the diffusion sheets in the diffusion sheet areas are respectively plated with antireflection films corresponding to the laser colors, the diffusion sheet areas are used for further eliminating speckles of the laser, and the rest areas are made of white glass, optical filters with corresponding colors or hollow parts; the second diffusion sheet is used for eliminating speckles of laser and transmitting fluorescence of other colors;

a spectral switching element (5) that reflects laser light of a color matching that of the laser light source (1) and transmits light of other colors;

the beam-splitting switching element (5) has two states, a state one and a state two,

when the state is first, the light splitting switch element (5) reflects laser used for exciting fluorescent powder from the first diffusion sheet (4) to the first focusing module, the laser irradiates the fluorescent powder wheel (8) after being focused by the first focusing module, fluorescent powder areas on the fluorescent powder wheel (8) excite fluorescent light with corresponding colors, the fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element (5), the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a light filter, a white glass area or hollow parts with corresponding colors on the color filtering wheel (10), and finally is projected to the light bar (11);

and in the second state, the light splitting switch element (5) reflects the laser from the first diffusion sheet (4) to the second focusing module, the laser focused by the second focusing module passes through the diffusion sheet coated with the antireflection film with the corresponding color on the color filtering color wheel (10) and irradiates the light bar (11).

2. The laser light source according to claim 1,

the light splitting switch element (5) is a dichroic mirror which can rotate and can be positioned to at least two angles, the dichroic mirror reflects laser light with the color matched with that of the laser source (1) and transmits light with other colors;

3. Laser light source according to claim 1 or 2,

the laser source (1) is used for providing blue laser;

the light splitting switch element (5) reflects blue laser and transmits other color light; when the state is first, the light splitting switch element (5) reflects laser used for exciting fluorescent powder from the first diffusion sheet (4) to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel (8), a fluorescent powder area on the fluorescent powder wheel (8) excites fluorescent light with corresponding color, the fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element (5), the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a filter, a white glass area or hollow of the corresponding color on the filter color wheel (10), and finally is projected to the light bar (11); when the laser is in the second state, the light splitting switch element (5) reflects the laser from the first diffusion sheet (4) to the second focusing module, the laser is focused by the second focusing module, and the laser passes through the second diffusion sheet or a diffusion sheet plated with an anti-reflection film corresponding to the color on the color filtering wheel (10) and irradiates a light bar (11);

the fluorescent powder wheel (8) comprises two fluorescent powder areas, wherein the first fluorescent powder area (8a) is a green fluorescent powder area, and the second fluorescent powder area (8b) is a yellow fluorescent powder area;

when the diffusion unit is arranged as the color filtering color wheel (10), the color filtering color wheel (10) comprises four areas, a first area (10a) is arranged as a red filter, and a second area (10b) is arranged as a green filter or white glass; the third area (10c) is set as a diffusion sheet area, and the diffusion sheet in the area is plated with an antireflection film which can transmit blue light and reflect other color light; the fourth area (10d) is provided as white glass for passing yellow fluorescence;

4. The laser light source according to claim 3,

the fluorescent powder wheel (8) further comprises a third fluorescent powder area (8c), and the third fluorescent powder area (8c) is a red fluorescent powder area.

5. Laser light source according to claim 1 or 2,

the laser source (1) provides blue laser and red laser;

the fluorescent powder wheel (8) comprises two areas, wherein the first fluorescent powder area (8a) is a green fluorescent powder area, and the second fluorescent powder area (8b) is a yellow fluorescent powder area;

when the diffusion unit is arranged as the color filtering color wheel (10), the color filtering color wheel (10) comprises four areas, a first area (10a) is arranged as a diffusion sheet area, and a diffusion sheet in the area is plated with an antireflection film which can transmit red light and reflect other color light; the second region (10b) is arranged as a green filter or white glass; the third area (10c) is set as a diffusion sheet area, and the diffusion sheet in the area is plated with an antireflection film which can transmit blue light and reflect other color light; the fourth area (10d) is provided as white glass for passing yellow fluorescence;

6. Laser light source according to claim 1 or 2,

the laser source (1) provides blue laser, red laser and green laser;

the fluorescent powder wheel (8) comprises a fluorescent powder area, and the first fluorescent powder area (8a) is a yellow fluorescent powder area;

the light-splitting switch element (5) reflects blue laser, red laser and green laser and transmits other color light; when the state is first, the light splitting switch element (5) reflects blue laser used for exciting fluorescent powder from the first diffusion sheet (4) to the first focusing module, the laser is focused by the first focusing module and then irradiates the fluorescent powder wheel (8), yellow fluorescent light is excited in a fluorescent powder area on the fluorescent powder wheel (8), the yellow fluorescent light is focused by the first focusing module and is projected to the second focusing module through the light splitting switch element (5), the fluorescent light focused by the second focusing module passes through the second diffusion sheet or a fourth area (10d) on the color filtering wheel (10), and finally is projected to the light bar (11); when the laser is in the second state, the light splitting switch element (5) reflects blue laser, red laser or green laser from the first diffusion sheet (4) to the second focusing module, the laser focused by the second focusing module passes through the second diffusion sheet or a diffusion sheet coated with an anti-reflection film corresponding to the color on the color filtering wheel (10) and irradiates a light bar (11);

when the diffusion unit is arranged as the color filtering color wheel (10), the color filtering color wheel (10) comprises four areas, a first area (10a) is arranged as a diffusion sheet area, and a diffusion sheet in the area is plated with an antireflection film which can transmit red light and reflect other color light; a second area (10b) a diffusion sheet area, wherein the diffusion sheet of the area is plated with an antireflection film which transmits green light and reflects other color light; the third area (10c) is set as a diffusion sheet area, and the diffusion sheet in the area is plated with an antireflection film which can transmit blue light and reflect other color light; the fourth area (10d) is arranged as white glass or hollow and is used for passing yellow fluorescence;

7. The control method of the laser light source is characterized by comprising the following steps:

step one, adjusting the state of the beam-splitting switch element (5) to be a state one: when the light which needs to be output by the laser light source is from the fluorescent powder wheel (8) or light which is from the fluorescent powder wheel (8) and is obtained after being filtered by the corresponding area of the color filtering wheel (10) or a second diffusion sheet, the light splitting switch element (5) is controlled to be kept in a state I, and blue laser light from the first diffusion sheet (4) is reflected to the first focusing module;

step two, outputting the light emitted by the fluorescent powder wheel (8), or the light emitted by the fluorescent powder wheel (8) and obtained after being filtered by the area corresponding to the color filtering wheel (10) or after being filtered by a second diffusion sheet: the fluorescent powder wheel (8) outputs one, two or more kinds of fluorescent light along with the rotation, the fluorescent light sequentially passes through the first focusing module, the first diffusion sheet (4), the light splitting switch element (5) and the second focusing module, then is projected to a corresponding area of the color filtering wheel (10) or the second diffusion sheet which synchronously rotates along with the fluorescent powder wheel (8), and finally is projected to the light bar (11) to realize the output;

step three, adjusting the state of the beam splitting switch element (5) to be a state two: when the laser light source needs to output light which is obtained by directly coming from a laser source (1) and passing through a diffusion sheet area corresponding to a color filter wheel (10) or passing through a second diffusion sheet, controlling a light-splitting switch element (5) to be kept in a second state and reflecting the laser of one, two or more colors from a first diffusion sheet (4) to a second focusing module;

step four, outputting the light emitted by the laser source (1): the light-splitting switch element (5) reflects the laser light of one, two or more colors from the first diffusion sheet (4) to the second focusing module, and then the laser light is projected to a light bar (11) to realize output after passing through a color filter wheel (10) or a second diffusion sheet which just rotates to align the second focusing module with the corresponding diffusion sheet region.

8. The method for controlling a laser light source according to claim 7, comprising the steps of:

step two, outputting yellow light: the fluorescent powder wheel (8) rotates right to align the second fluorescent powder area (8b) with the first focusing module at the moment, and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light passes through the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering color wheel (10) or the second diffusion sheet which rotates right to align the fourth area (10d) with the second focusing module in sequence and then is projected to the light bar (11) to output yellow light;

step three, outputting red light: although the fluorescent powder wheel (8) rotates, the second fluorescent powder area (8b) is still aligned to the first focusing module at the moment and is excited by blue laser to emit yellow fluorescent light, the yellow fluorescent light sequentially passes through the first diffusion sheet (4) of the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering wheel (10) which just rotates to align the first area (10a) to the second focusing module, and then red light is filtered by yellow light and projected to the light bar (11) to output red light; when the second diffusion sheet is adopted, the fluorescent powder wheel (8) further comprises a third fluorescent powder area (8c), the third fluorescent powder area (8c) is a red fluorescent powder area, and the red fluorescent light excited in the third fluorescent powder area (8c) passes through the first diffusion sheet (4) of the first focusing module, the light splitting switch element (5), the second focusing module and the second diffusion sheet in sequence and is projected to the light bar (11) to output red light;

step four, outputting green light: the fluorescent powder wheel (8) continues to rotate, and is aligned to the first focusing module by a first fluorescent powder area (8a), the first fluorescent powder area (8a) is excited by blue laser to emit green fluorescent light, the green fluorescent light sequentially passes through a first diffusion sheet (4) of the first focusing module, a light splitting switch element (5), a second focusing module and a color filtering color wheel (10) or a second diffusion sheet which just rotates to align to the second focusing module by a second area (10b), and then is projected to a light bar (11) to output green light;

step six, outputting blue light: the light-splitting switch element (5) reflects the blue laser from the first diffusion sheet (4) to the second focusing module, and then projects the blue laser to a light bar (11) to output blue light after passing through a color filtering wheel (10) or a second diffusion sheet which just rotates to be aligned with the second focusing module through a third area (10 c);

9. The method for controlling a laser light source according to claim 7, comprising the steps of:

step three, outputting green light: the fluorescent powder wheel (8) continues to rotate, and is aligned to the first focusing module by a first fluorescent powder area (8a), the first fluorescent powder area (8a) is excited by blue laser to emit green fluorescent light, the green fluorescent light sequentially passes through a first diffusion sheet (4) of the first focusing module, a light splitting switch element (5), a second focusing module and a color filtering color wheel (10) or a second diffusion sheet which just rotates to align to the second focusing module by a second area (10b), and then is projected to a light bar (11) to output green light;

step five, outputting red light: the laser source (1) emits red laser, the light splitting switch element (5) reflects the red laser from the first diffusion sheet (4) to the second focusing module, and the red laser is projected to a light bar (11) to output red light after passing through a color filtering color wheel (10) or a second diffusion sheet which just rotates to be aligned to the second focusing module by a first area (10 a);

step six, outputting blue light: the laser source (1) emits blue laser, the light splitting switch element (5) reflects the blue laser from the first diffusion sheet (4) to the second focusing module, and the blue laser is projected to a light bar (11) to output blue light after passing through a color filtering color wheel (10) or a second diffusion sheet which just rotates to be aligned to the second focusing module by a third area (10 c);

10. The method for controlling a laser light source according to claim 7, comprising the steps of:

step two, outputting yellow light: the fluorescent powder wheel (8) rotates right to align the first fluorescent powder area (8a) with the first focusing module and is excited by blue laser to emit yellow fluorescent light, and the yellow fluorescent light passes through the first focusing module, the light splitting switch element (5), the second focusing module and the color filtering color wheel (10) or the second diffusion sheet which rotates right to align the fourth area (10d) with the second focusing module in sequence and then is projected to the light bar (11) to output yellow light;

step four, outputting red light: the laser source (1) emits red laser, the light splitting switch element (5) reflects the red laser from the first diffusion sheet (4) to the second focusing module, and the red laser is projected to a light bar (11) to output red light after passing through a color filtering color wheel (10) or a second diffusion sheet which just rotates to be aligned to the second focusing module by a first area (10 a);

step five, outputting green light: the laser source (1) emits green laser, the light splitting switch element (5) reflects the green laser from the first diffusion sheet (4) to the second focusing module, and the green laser is projected to a light bar (11) to output green light after passing through a color filtering color wheel (10) or a second diffusion sheet which just rotates to be aligned to the second focusing module by a second area (10 b);