CN111766712B - Laser scanning projection module with high brightness, wide color gamut and low light spot - Google Patents

Laser scanning projection module with high brightness, wide color gamut and low light spot Download PDF

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CN111766712B
CN111766712B CN202010714699.3A CN202010714699A CN111766712B CN 111766712 B CN111766712 B CN 111766712B CN 202010714699 A CN202010714699 A CN 202010714699A CN 111766712 B CN111766712 B CN 111766712B
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scanning
laser diode
color
optical fiber
laser
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CN111766712A (en
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黄曙光
卢睿
罗敬凯
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Shenzhen Ruisi Huachuang Technology Co ltd
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Shenzhen Ruisi Huachuang Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources

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  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

A high-brightness wide-color-gamut low-light-spot laser scanning projection module at least comprises a laser diode unit, a condenser unit, a combined optical fiber, a collimating mirror unit, a scanning micromotor, a scanning reflector and a projection screen, wherein the laser diode unit consists of monochromatic laser diodes with two colors or three colors, and each color comprises two or more monochromatic laser diodes; the laser wavelength selection of the monochromatic laser diode with the same color is judged by adopting a CIE1931 color level diagram and a MacAdam ellipse, and the laser wavelength has at least three-order deviation. This projection module increases same colour spectrum laser diode quantity and adopts condensing lens focus mode and optic fibre import mode for projection luminance is high, adopts CIE1931 colour rank diagram and the same colour laser of the at least third order deviation of MacAdam ellipse selection spectrum simultaneously, destroys laser coherence through increasing spectral width, thereby reduces the facula, makes the low facula of the wide colour gamut of projection.

Description

Laser scanning projection module with high brightness, wide color gamut and low light spot
Technical Field
The invention relates to a vehicle-mounted laser projection device, in particular to a laser scanning projection module which increases the number of laser diodes with the same color spectrum, increases the spectrum width, adopts a condensing lens focusing mode and an optical fiber leading-in mode and projects high-brightness wide-color-gamut low-spot.
Background
At present, vehicle-mounted projection modules mainly comprise three types, namely a DLP (Digital Light Processing) projection module, a liquid crystal projection module and a laser scanning module, wherein the working principles of the DLP and the liquid crystal projection modules are consistent, a DLP chip or a liquid crystal display chip is used as an image display source, and an image is projected to a required area by adopting a projection mode.
As shown in fig. 1, a typical common laser scanning projection module mainly comprises a red (R) laser diode 1 ', a green (G) laser diode 2', a blue (B) laser diode 3 ', a beam shaping unit 4', a beam combining mirror 5 ', a beam combining mirror 6', a micro-motor (mems) 8 ', a reflecting mirror 7', a beam shaping unit 9 ', and a projection screen 10';
the laser diode 1 'of red (R) emits laser with a certain divergence angle, forms collimated laser after passing through the beam shaping unit 4', penetrates through the beam combining mirror 4 'and the beam combining mirror 5', and strikes on the reflector 7 'driven by the micromotor 8', and similarly, the laser diodes of green (G) and blue (B) reach the reflector 7 'driven by the micromotor 8' through similar paths;
the micro-motor 8 ' drives the reflector 7 ' to move in the horizontal direction and the vertical direction at a certain step angle, for example, 1200X800 points are scanned in the range of 40 degrees horizontally and 20 degrees vertically, and the laser scanning projection module can display a required color image on the projection screen 10 ' by matching with the display time ratio of the laser diodes with three colors of R/G/B at each scanning point.
The present laser scanning projection module is characterized in that one color can only adopt one laser diode, because of scanning type imaging, a light beam which needs to be emitted is approximately collimated, that is, the light source expansion of a light source needs to be reduced to a certain degree, so that the light source expansion is increased simply in space, the light source expansion is increased by a large margin inevitably, and the effect of improving the brightness can not be achieved, and the specific description is as follows.
In one color one laser diode mode:
light emitting spot area S of laser diodeLDApproximately equal to 0, light-emitting angle SIN thetaLD=0.64 (typical value), so the light source spread of the laser diode is SLD*SINθLDApproximately equals 0, in order to achieve the effect of scanning imaging, the angle of the scanning emergent light is required to be approximately 0 degree, namely SIN thetaSCAN0, while scanning the area S of the mirrorSCAN≈1mm2Therefore, the light source expansion required for the output of the scanning mirror is SSCAN*SINθSCAN≈0，
SLD*SINθLD≈SSCAN*SINθSCANApproximately equal to 0, that is to say the light source spread of the laser diode is approximately equal to or even smaller than the required spread of the scanning-emission light source, so that the energy of the laser diode can be almost fully utilized by one laser diode for one color.
In a mode where there are N laser diodes in one color:
if the laser diode cross-sectional dimension D =10mm2Then, N light sources are spatially arranged, and the light source expansion is N × D × SIN θLDWhen N =2, N × D SIN θLD =20*SINθLDWill be much larger than the scanning emergent light source extension SSCAN*SINθSCAN≈1*SINθSCANTherefore, the energy of the two laser diodes can not be fully utilized, which is equivalent to the energy of the second laser diode is redundant and can not enter the scanning reflector.
Obviously, the brightness of the laser scanning projection module cannot be improved by a plurality of laser diodes with one color in a conventional arrangement mode.
Therefore, in the solution of the laser scanning projection module, three colors of RGB can only use three laser diodes, and the brightness of the laser scanning projection module is obviously limited, although there is a proposal that laser diodes of intermediate wavelength bands are inserted between red and green wavelength bands and between green and blue wavelength bands, and are also merged into the original optical path in a beam combination manner to improve the brightness of the laser scanning projection module, the brightness improvement of the method is obviously limited, and the reduction of the display color gamut can be brought.
In addition, in the optical imaging system of laser projection, due to the high coherence of the laser, the light intensity distribution of bright and dark mixed light and light are a 'spot (spot) phenomenon', which is considered to be noise influencing the image quality,
the existing laser projection device has no effective measure on weakening or eliminating facula, and the facula problem is still an important research subject on the existing laser projection optical system.
Disclosure of Invention
The invention aims to solve the technical problems and provides a high-brightness wide-color-gamut low-facula laser scanning projection module, which increases the number of laser diodes with the same color spectrum, adopts a condenser focusing mode and an optical fiber leading-in mode to ensure high projection brightness, adopts a CIE1931 color level diagram and a MacAdam ellipse to select the same color laser with at least three-order deviation of frequency spectrum, and destroys laser coherence by increasing the frequency spectrum width, thereby reducing facula and ensuring wide-color-gamut low-facula projection.
The technical scheme of the invention is based on the further improvement of the technical scheme disclosed by the inventor's patent number of ' 202010005796 ' and the name of ' a high-brightness laser scanning projection module ', and the problem of facula of laser projection is further solved on the basis of solving the problem of high-brightness laser projection.
In order to solve the above-mentioned prior art problems, the technical scheme of the invention is as follows:
a laser scanning projection module with high brightness, wide color gamut and low light spot at least comprises a laser diode unit, a condenser unit, a combined optical fiber, a collimating mirror unit, a scanning micromotor, a scanning reflector and a projection screen, wherein the laser diode unit consists of monochromatic laser diodes with two or three colors, each monochromatic laser diode comprises two or more monochromatic laser diodes with the same color, and the light-emitting point area of a single monochromatic laser diode is SLDThe light emitting angle of a single monochromatic laser diode is SIN thetaLDThe single monochromatic laser diode outputs light source with the spread of SLD*SINθLD；
As an improvement, the laser wavelength selection of the monochromatic laser diode of the same color is determined by using a CIE1931 color level diagram and macadam ellipses, and is selected by using a three-order macadam ellipse or a four-order macadam ellipse, the laser wavelength of different monochromatic laser diodes of the same color has at least three-order deviation, the macadam ellipse uses orders to describe the standard deviation of the laser wavelength, the first-order macadam ellipse refers to the standard deviation of 1-time variation of the color matching result from the target color, the second-order, third-order and fourth-order are the same, if two color coordinates fall within the first-order macadam ellipse, the human eye can hardly see the difference between the two, and the difference between the color corresponding to the boundary of the three-order macadam ellipse and the central color is the color difference value which is perceivable by the human eye, in the patent scheme, if the red R includes the monochromatic laser diode A, B, a can be selected as the wavelength of the central color of the three-order macadam ellipse, b, selecting the color wavelength corresponding to the boundary of the third-order MacAdam ellipse, and controlling the laser wavelengths of different monochromatic laser diodes with the same color to be three-order deviation by using the same other colors, so that the spectral width is increased to destroy the laser coherence, and further, the light spots are reduced, and the wide color gamut and the low light spots are projected;
every monochromatic laser diode 'S exit end is provided with a condensing lens unit, condensing lens unit is used for forming the focus facula with monochromatic laser diode' S emergent light focus, the area of focus facula is SFOCUSThe divergence numerical aperture of the focused light spot is NAFOCUS；
The exit end of each condenser lens unit is provided with an optical fiber input end, a focusing light spot formed by the condenser lens unit falls into the corresponding optical fiber input end, a plurality of optical fiber input ends corresponding to each monochromatic laser diode form a combined optical fiber in a binding or welding mode, and the area of the single optical fiber input end is SFIBERThe numerical aperture of divergence of the input end of a single optical fiber is NAFIBERLight source spread of S for single fiber input endFIBER*NAFIBEREach monochromatic laser diode is NLDThe light source expansion of the output end of the combined optical fiber is NLD*SFIBER*NAFIBER；
The optical fiber input end satisfies the condition: sFOCUS≤SFIBER，NAFOCUS≤NAFIBER；
The emergent end of each combined optical fiber is provided with a collimating mirror unit which is used for collimating the light beam at the emergent end of the combined optical fiber in a certain light spot area SCOMAnd a divergent numerical aperture NACOMInternal;
the exit end of the collimating mirror unit is provided with a beam combiner, and the light beams at the exit ends of the plurality of combined optical fibers are combined into a combined light beam through the beam combiner;
the scanning speculum sets up on the light path of combination light beam, combination light beam forms the scanning through the scanning speculum and exits the light beam, the projection screen sets up on the light path of the scanning outgoing light beam, the scanning micromotor is connected with the scanning speculum, the scanning micromotor drives the scanning speculum with certain step angle and carries out the motion of horizontal direction and vertical direction, the combination light beam forms the scanning outgoing light beam after the scanning speculum, the scanning outgoing light beam projects the projection screen with the matrix mode according to the motion of scanning speculum and forms the image, the scanning speculum area is SSCANThe divergence numerical aperture of the scanned emergent beam is NASCANThe allowable diffusion angle of the scanning emergent light beam is SIN thetaSCAN；
The scanning mirror satisfies the condition one: sCOM≤SSCAN，NACOM≤NASCAN；
The scanning mirror satisfies the second condition: n is a radical ofLD*SFIBER*NAFIBER≤SSCAN*SINθSCAN。
Further, the monochromatic laser diode is a red laser diode or a green laser diode or a blue laser diode;
further, the condenser unit is a lens or two lenses or a plurality of lenses;
further, the manner in which a plurality of the optical fiber input ends form one combined optical fiber is not limited to the bundling or fusion splicing manner.
Each monochromatic laser diode of the laser scanning projection module is provided with two or more monochromatic laser diodes, for example, two or more red laser diodes are arranged, light emitted by the two or more red laser diodes is respectively focused into a light spot through the corresponding condenser lens unit, the light spot falls in the corresponding optical fiber input end, a plurality of optical fiber input ends form a combined optical fiber in a binding or welding mode, a red light source with little increase of light source expansion amount but much increase of energy is obtained at the exit end of the combined optical fiber, light beams at the exit end of the combined optical fiber are shaped by the collimating lens unit to become approximately collimated light spots, the collimated light spots pass through the beam combining lens and then strike on the scanning reflector, the scanning reflector is driven by a micromotor to scan and reflect to a projection screen, and the green laser diode and the blue laser diode are based on the same principle, and finally, forming a display image synthesized by multiple colors on the projection screen, wherein each monochromatic laser diode of the display image light source adopts two or more monochromatic laser diodes, and the light source expansion is effectively controlled in the light path process, so that the energy of the display image is increased, and high-brightness display is realized.
In order to reduce the laser speckle effect, the most direct way is to destroy the coherence, wherein the width of the spectrum can be increased, so we can use laser diodes with the same color but different wavelengths for coupling, and we can use the CIE1931 color scale diagram and macadam ellipse to judge the selection of the laser wavelength, macadam ellipse is usually described by "step", where "step" is actually the standard deviation, 1-step macadam ellipse is the standard deviation of the variation of the color matching result 1 times the target color, and the same principle can be known, 3-step, 4-step, etc., if two color coordinates fall within 1-step macadam ellipse, the human eye can hardly see what the two are different, and the difference between the color corresponding to the boundary of the 3-step macadam ellipse and the center color is just the color difference value perceivable by the human eye, therefore, the wavelength difference range of the green laser diode, the red laser diode and the blue laser diode can be selected to be within the third-order MacAdam ellipse, and the laser scanning projection module with high brightness, high color gamut and low facula effect can be realized by using the method.
The invention relates to a laser scanning projection module with high brightness, wide color gamut and low light spot, which has the following beneficial effects:
1. the laser scanning projection module increases the number of laser diodes with the same color spectrum, and adopts a condenser focusing mode and an optical fiber leading-in mode, so that a light source with small light source expansion amount and large energy can be obtained, and the projection brightness is high;
2. the laser scanning projection module projects an image to a required area in a point-by-point scanning mode and has the advantage of high contrast;
3. the CIE1931 color level diagram and the MacAdam ellipse are adopted to select the same color laser with at least three-order deviation of the spectrum, and the laser coherence is damaged by increasing the spectrum width, so that the facula is reduced, and the wide color gamut and the low facula are projected.
Drawings
FIG. 1 is a schematic diagram of a conventional laser scanning projection module;
fig. 2 is a structural diagram of a laser scanning projection module with high brightness, wide color gamut and low light spot according to the present invention.
Fig. 3 is a schematic diagram of a CIE1931 color level diagram and macadam ellipses used by the laser scanning projection module with high brightness, wide color gamut and low light spot.
Detailed Description
The invention is further illustrated by the following examples:
example (b):
referring to fig. 2, the laser scanning projection module with high brightness, wide color gamut and low light spot comprises a laser diode unit, a condenser unit 4, a combined optical fiber 6, a collimating mirror unit 5, a scanning micromotor 8, a scanning reflector 7 and a projection screen 10, wherein the laser diode unit consists of monochromatic laser diodes with three colors, including a red laser diode 1, a green laser diode 2 and a blue laser diode 3, each of the monochromatic laser diodes comprises three monochromatic laser diodes, and the area of a light emitting point of a single monochromatic laser diode is SLDThe light emitting angle of a single monochromatic laser diode is SIN thetaLDThe single monochromatic laser diode outputs light source with the spread of SLD*SINθLD；
As shown in fig. 3, the laser wavelength selection of the monochromatic laser diode of the same color is determined by using the CIE1931 color scale diagram and macadam ellipse, in fig. 3, T1 is the first-order macadam ellipse, T2 is the second-order macadam ellipse, and T3 is the third-order macadam ellipse, in the scheme of the patent, the selection is performed by the third-order macadam ellipse T3, at least three-order deviation of the laser wavelength of different monochromatic laser diodes of the same color, if the red laser diode 1 includes two monochromatic laser diodes 1a, 1b, 1a can be selected as the wavelength of the central color of the third-order macadam ellipse T3, 1b is selected as the color wavelength corresponding to the boundary of the third-order macadam ellipse T3, and other colors are the same, so that the laser wavelength of different monochromatic laser diodes of the same color is controlled at the laser wavelength deviation, thereby increasing the spectrum width to destroy the laser coherence, further reducing light spots, and projecting wide color gamut and low light spots;
every monochromatic laser diode 'S exit end is provided with a condensing lens unit 4, condensing lens unit 4 is used for forming the focus facula with monochromatic laser diode' S exit light focus, the area of focus facula is SFOCUSThe divergence numerical aperture of the focused light spot is NAFOCUS；
Each exit end of the condenser lens unit 4 is provided with an optical fiber input end 6, a focusing light spot formed by the condenser lens unit 4 falls into the corresponding optical fiber input end 6, a plurality of optical fiber input ends 6 corresponding to each monochromatic laser diode form a combined optical fiber 9 in a binding or welding mode, and the area of the single optical fiber input end is SFIBERThe numerical aperture of divergence of the input end of a single optical fiber is NAFIBERLight source spread of S for single fiber input endFIBER*NAFIBERAnd the number of each monochromatic laser diode is 3, the light source expansion of the output end of the combined optical fiber is 3SFIBER*NAFIBER；
The optical fiber input end 6 satisfies the condition: sFOCUS≤SFIBER，NAFOCUS≤NAFIBER；
The emergent end of each combined optical fiber 9 is provided with a collimating mirror unit 5 which is used for collimating the light beam at the emergent end of the combined optical fiber in a certain light spot area SCOMAnd a divergent numerical aperture NACOMInternal;
the exit end of the collimating mirror unit is provided with beam combining mirrors 11 and 12, and the beams at the exit ends of the three combined optical fibers 9 are combined into a combined beam after passing through the beam combining mirror 11 and the beam combining mirror 12;
the scanning reflector 7 is arranged on a light path of the combined light beam, the combined light beam forms a scanning emergent light beam through the scanning reflector 7, the projection screen 10 is arranged on a light path of the scanning emergent light beam, the scanning micromotor 8 is connected with the scanning reflector 7, the scanning micromotor drives the scanning reflector to move in the horizontal direction and the vertical direction at a certain stepping angle, the combined light beam forms a scanning emergent light beam after passing through the scanning reflector, the scanning emergent light beam is projected to the projection screen in a matrix mode according to the movement of the scanning reflector to form an image, and the area of the scanning reflector is SSCANThe divergence numerical aperture of the scanned emergent beam is NASCANThe allowable diffusion angle of the scanning emergent light beam is SIN thetaSCAN；
The scanning mirror satisfies the condition one: sCOM≤SSCAN，NACOM≤NASCAN；
The scanning mirror satisfies the second condition: 3SFIBER*NAFIBER≤SSCAN*SINθSCAN。
Each monochromatic laser diode of the laser scanning projection module is provided with three monochromatic laser diodes, if three red laser diodes 1 are arranged, light emitted by the three red laser diodes is focused into a light spot through corresponding condenser lens units respectively, the light spot falls into a corresponding optical fiber input end, the three optical fiber input ends form a combined optical fiber in a welding mode, a red light source with little increase of light source expansion amount but much increase of energy is obtained at the exit end of the combined optical fiber, light beams at the exit end of the combined optical fiber are shaped by a collimating lens unit and then become approximately collimated light spots, the collimated light spots pass through a beam combining lens and then are emitted onto a scanning reflecting mirror, a micro-motor drives the scanning reflecting mirror to scan and reflect to a projection screen, a green laser diode 2 and a blue laser diode 3 form a display image synthesized by three colors on the projection screen according to the same principle, each monochromatic laser diode of the image display light source adopts three monochromatic laser diodes, and the light source expansion is effectively controlled in the light path process, so that the energy of the displayed image is increased, and high-brightness display is realized.
In the scheme, the selection of the laser wavelength of the monochromatic laser diode with the same color is judged by adopting a CIE1931 color level diagram and a MacAdam ellipse, so that the wavelength difference range of the green laser diode, the red laser diode and the blue laser diode can be selected within the three-order MacAdam ellipse, and the laser scanning projection module with high brightness, high color gamut and low facula effect can be realized by using the method.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Claims (4)

1. The laser scanning projection module is characterized by at least comprising a laser diode unit, a condenser unit, a combined optical fiber, a collimating mirror unit, a scanning micromotor, a scanning reflector and a projection screen, wherein the laser diode unit consists of monochromatic laser diodes with two colors or three colors, each monochromatic laser diode with each color comprises two or more monochromatic laser diodes with the same color, and the light emitting point area of a single monochromatic laser diode is SLDThe light emitting angle of a single monochromatic laser diode is SIN thetaLDThe single monochromatic laser diode outputs light source with the spread of SLD*SINθLD；
The laser wavelength selection of the monochromatic laser diode with the same color adopts a CIE1931 color level diagram and a MacAdam ellipse for judgment, the three-order MacAdam ellipse or the four-order MacAdam ellipse is selected, the laser wavelength of different monochromatic laser diodes with the same color has at least three-order deviation, the MacAdam ellipse adopts orders to describe the standard deviation of the laser wavelength, the first-order MacAdam ellipse refers to the standard deviation of the color matching result variation 1 time away from the target color, the second-order, the third-order and the fourth-order are the same, if two color coordinates fall within the first-order MacAdam ellipse, the human eye can hardly see the difference between the two, and the difference between the color corresponding to the boundary of the third-order MacAdam ellipse and the center color is the color difference value which can be perceived by the human eye;
every monochromatic laser diode 'S exit end is provided with a condensing lens unit, condensing lens unit is used for forming the focus facula with monochromatic laser diode' S emergent light focus, the area of focus facula is SFOCUSThe divergence numerical aperture of the focused light spot is NAFOCUS；
The exit end of each condenser lens unit is provided with an optical fiber input end, a focusing light spot formed by the condenser lens unit falls into the corresponding optical fiber input end, a plurality of optical fiber input ends corresponding to each monochromatic laser diode form a combined optical fiber in a binding or welding mode, and the area of the single optical fiber input end is SFIBERThe numerical aperture of divergence of the input end of a single optical fiber is NAFIBERLight source spread of S for single fiber input endFIBER*NAFIBEREach monochromatic laser diode is NLDThe light source expansion of the output end of the combined optical fiber is NLD*SFIBER*NAFIBER；
The optical fiber input end satisfies the condition: sFOCUS≤SFIBER，NAFOCUS≤NAFIBER；
The emergent end of each combined optical fiber is provided with a collimating mirror unit which is used for collimating the light beam at the emergent end of the combined optical fiber in a certain light spot area SCOMAnd a divergent numerical aperture NACOMInternal;
the exit end of the collimating mirror unit is provided with a beam combiner, and the light beams at the exit ends of the plurality of combined optical fibers are combined into a combined light beam through the beam combiner;
the scanning reflector is arranged on the light path of the combined light beam, the combined light beam forms a scanning emergent light beam through the scanning reflector, the projection screen is arranged on the light path of the scanning emergent light beam, and the scanning micromotor are connectedThe scanning micro-motor drives the scanning reflector to move in the horizontal direction and the vertical direction at a certain stepping angle, the combined light beam forms a scanning emergent light beam after passing through the scanning reflector, the scanning emergent light beam is projected to a projection screen in a matrix mode according to the movement of the scanning reflector to form an image, and the area of the scanning reflector is SSCANThe divergence numerical aperture of the scanned emergent beam is NASCANThe allowable diffusion angle of the scanning emergent light beam is SIN thetaSCAN；
The scanning mirror satisfies the condition one: sCOM≤SSCAN，NACOM≤NASCAN；
The scanning mirror satisfies the second condition: n is a radical ofLD*SFIBER*NAFIBER≤SSCAN*SINθSCAN。
2. A high brightness wide color gamut low spot laser scanning projection module according to claim 1, wherein said monochromatic laser diode is a red laser diode or a green laser diode or a blue laser diode.
3. The laser scanning projection module with high brightness, wide color gamut and low light spot according to claim 1, wherein the condenser lens unit is one lens or two lenses or a plurality of lenses.
4. The module of claim 1, wherein the input ends of the plurality of optical fibers form a combined optical fiber, and the combined optical fiber is not limited to a bundled or welded optical fiber.
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