CN101750854B

CN101750854B - Optical-fiber laser wide projection device

Info

Publication number: CN101750854B
Application number: CN200810227981.8A
Authority: CN
Inventors: 王斌; 毕勇; 叶成伟
Original assignee: Beijing Phoebus Vision Optoelectronic Co ltd; Academy of Opto Electronics of CAS
Current assignee: Beijing Phoebus Vision Optoelectronic Co ltd; Academy of Opto Electronics of CAS
Priority date: 2008-12-03
Filing date: 2008-12-03
Publication date: 2014-06-25
Anticipated expiration: 2028-12-03
Also published as: CN101750854A

Abstract

The invention provides an optical-fiber laser wide projection device, which comprises a light source, a coupled lens system, a transmitting device, a fixed body and a modulator. The coupled lens system carries out shaping and coupling on the light emitted from the light source, and then transmits the shaped and coupled light to the transmitting device; and after being sent out from an output end of the transmitting device arranged at the fixed body, the light is modulated by the modulator. The transmitting device comprises a plurality of optical fibers which are divided into a plurality of bundles of optical fiber bundles, wherein a set of fiber bundles, namely a pixel unit is formed by at least one optical fiber of each optical fiber bundle; and the output end of the pixel unit is fixed on the fixed body and outputs light in the same light output surface. The device improves the utilization rate and the coupling efficiency of the light source as well as the image contrast, and can eliminate the speckle effect.

Description

Optical fiber laser broad-width projection device

Technical Field

The invention relates to a laser projection device, in particular to an optical fiber laser wide-width projection device.

Background

Laser projection devices are increasingly used in current production and life. The laser projection device can be applied in the display field, can provide large-screen projection images for audiences, can also be applied in the illumination field, such as outdoor large-scale colored lamps, and can also be applied in the printing and typesetting printing fields, such as laser photocopiers and the like.

In the prior art, there are a variety of laser projection devices that are used in different devices. For example, in japanese patent publication No. JP2007140009, there is disclosed a projection display device of an optical fiber conducted image, which includes red, green and blue semiconductor lasers 101R, 101G and 101B, first and second scanning galvanometers 102 and 103, an optical fiber 105 and a screen 110, as shown in fig. 1. In the projection display device described above, each component in front of the screen 110 may be regarded as one laser projection device. In this laser projection apparatus, red, green and blue semiconductor lasers 101R, 101G and 101B provide light sources, a first scanning galvanometer 102 and a second scanning galvanometer 103 perform scanning in a horizontal direction (X-axis direction) and a vertical direction (Y-axis direction), respectively, and a light beam output from the second scanning galvanometer is conducted to a screen 110 through an optical fiber 105.

Compared with the traditional laser display system, the laser projection display device adopting the laser projection device solves the problem of low display screen brightness by utilizing the direct light-emitting characteristic in the laser projection device, but has certain defects. Specifically, the following drawbacks are included:

1. the semiconductor laser projection display device adopts a mode of firstly modulating and then coupling light splitting in the projection process, so that after a light beam passes through a plurality of optical elements, the quality of the light beam is reduced due to scattering, defocusing and other reasons, the optical quality of emergent light of the light beam is reduced when the light beam is optically coupled and split, and the utilization rate of a light source is reduced.

2. The semiconductor laser projection display device adopts a scanning mode that the vibrating mirror scans the same display screen point by point, and each scanning point has influence on the brightness and the chromaticity of adjacent scanning points, so that the contrast of the screen is low.

3. The semiconductor laser projection display device adopts a vibrating mirror scanning mode, and the light beam incident angle at the edge of the screen is large, so that the area of an incident light spot is increased, the power density is reduced, the brightness of the edge of the screen is reduced, and the brightness of the whole screen becomes uneven.

4. The optical fiber bundle coupling surface of the semiconductor laser projection display device is an arc surface, the manufacturing of the arc surface needs to ensure that the axis of each optical fiber is perpendicular to the section of the arc surface, and the manufacturing process of one projection device needs to ensure that the axis of each optical fiber is perpendicular to the section of the arc surface is very difficult.

As can be seen from the above-mentioned drawbacks of the semiconductor laser projection display device, the drawbacks of the laser projection display device are basically related to the structure of the laser projection device, and the laser projection display device can overcome the drawbacks only by fundamentally improving the structure of the laser projection device.

Disclosure of Invention

The invention aims to overcome the defects of poor projection quality, low screen contrast ratio and the like of the conventional optical fiber laser projection device caused by the self structure and the projection working principle, so that the wide optical fiber laser projection device with good projection quality and high screen contrast ratio is provided.

In order to achieve the above object, the present invention provides an optical fiber laser broad projection device, which includes a light source, a coupling lens set, a transmission device, a fixed body and a modulator; the coupling lens group performs shaping coupling on the light emitted by the light source, then transmits the light after shaping coupling into the transmission device, and the light is emitted by the output end of the transmission device arranged on the fixed body and then modulated by the modulator.

In the above technical solution, the optical lens module further includes a micro-coupling lens group, and the micro-coupling lens group is located between the fixed body and the modulator and is used for focusing light transmitted by the transmission device.

In the above technical solution, the light source includes at least three primary color light sources, and the light sources satisfy the power matching white balance principle.

In the above technical scheme, the light source is a solid laser, a semiconductor laser, a fiber laser or a gas laser.

In the above technical solution, the coupling lens group includes coupling lenses for respectively transmitting the light sources, and the number of the coupling lenses is consistent with the number of the light sources.

In the above technical solution, the coupling lens is a self-focusing lens, a cylindrical lens, an aspherical lens or a spherical lens group.

In the above technical solution, the transmission device includes a plurality of optical fibers, the optical fibers are divided into a plurality of bundles of optical fibers, and the bundles of optical fibers are placed behind the coupling lens and correspond to the coupling lens one to one.

In the above technical solution, the bundle of optical fibers transmits light of the same color, and the optical powers transmitted by the optical fibers in the same bundle of optical fibers are the same.

In the above technical solution, at least one optical fiber in each bundle of optical fibers forms a group of optical fiber bundles, the group of optical fiber bundles forms a pixel unit, each optical fiber in the pixel unit conducts light of one color, at least one optical fiber conducts light of one color, and the light conducted by each pixel unit satisfies the power matching white balance principle.

In the above technical solution, the fixing body includes a plurality of holes for placing the pixel units, the holes correspond to the pixel units one to one, and the output ends of all the pixel units are in the same light output plane.

In the above technical solution, the pixel unit adopts a conventional optical fiber having a core refractive index greater than a cladding refractive index.

In the above technical solution, the output end of the pixel unit is integrated by the output end surface of the conventional optical fiber to form a light emitting surface, and the light emitting surface is installed in the fixing body.

In the technical scheme, the pixel unit adopts an optical fiber comprising a total reflection section and a light leakage section, wherein the refractive index of a core of the total reflection section is greater than that of a cladding, and light beams are totally reflected in the optical fiber; the refractive index of the core of the light leakage section is smaller than that of the cladding, and the light beams are transmitted out from the circumferential surface of the optical fiber.

In the above technical solution, the output end of the pixel unit adopts the light leakage section, the rest adopts the total reflection section, the light leakage section of each optical fiber is wound in a plane to form a light emitting source, and all the light emitting sources are installed in the fixing body to form one light emitting surface.

In the above technical solution, there is a length difference between the optical fibers conducting the same color light, and a path difference generated by the light conducted in the optical fibers conducting the same color light is greater than a coherence length.

In the above technical solution, the modulator includes a plurality of fine modulation units, the fine modulation units correspond to the pixel units one to one, and each fine modulation unit includes a plurality of micro modulators.

In the above technical solution, the micro modulator is a micro liquid crystal modulator or a volume bragg grating.

In the above technical solution, the micro-coupling lens group includes a plurality of micro-coupling lenses, and each of the micro-coupling lenses is fixed on the output end surface of the pixel unit and corresponds to the pixel unit one by one.

In the above technical solution, the fine adjustment unit is installed behind each micro-coupling lens, and the micro-coupling lenses correspond to the fine adjustment units one to one.

In the above technical solution, the number of the micro-modulators in each micro-modulation unit is consistent with the number of the optical fibers in the pixel unit or the number of the colors of the light transmitted by the pixel unit.

In the above technical solution, the fiber laser wide projection apparatus further includes a scattering lens for increasing a scattering angle of the light modulated by the modulator and scattering the light.

In the above technical solution, the optical fiber laser wide projection apparatus further includes a display screen for displaying.

In the above technical solution, the scattering lens is a fresnel lens, a spherical lens group or an aspheric lens.

The invention has the advantages that:

1. the optical fiber laser wide-width projection device adopts a mode of coupling light splitting firstly and modulating secondly, and laser does not pass through other optical devices except a coupling lens and an optical fiber in the process of conducting laser from a light source to a modulator, so that the quality of laser beams is better in the process, the coupling efficiency of the laser is correspondingly improved, the loss of light energy is small, and the utilization rate of the laser light source is improved.

2. The optical fiber laser broad projection device provided by the invention can be used for carrying out individual modulation on each optical fiber by using the individual tiny liquid crystal modulator, so that the modulation efficiency of a modulation system is high, and adjacent pixel points cannot be influenced mutually, so that a display device adopting the optical fiber laser broad projection device has higher image contrast.

3. The optical fiber laser wide-width projection device has the advantages that the lengths of the optical fibers for transmitting the same color light in different pixel units are different, so that the optical paths of the light beams are different, the optical paths of the laser beams with the same color are different and the optical path difference is larger than the coherence length by adjusting the lengths of the optical fibers for transmitting the same color light, and the speckle effect in projection display is reduced.

4. The optical fiber coupling surface of the optical fiber laser wide-width projection device is a plane, and the manufacturing process is simple.

Drawings

FIG. 1 is a schematic diagram of a laser projection apparatus in the prior art;

fig. 2 is a schematic structural diagram of a fiber laser large screen display device employing the fiber laser wide projection device of the present invention in one embodiment;

FIG. 3 is a schematic diagram of a wide-width fiber laser projector with pixel units mounted on a fixed body;

FIG. 4 is an optical fiber of another configuration for use with the present invention;

fig. 5 is a schematic view of an output end of an optical fiber wound with the optical fiber shown in fig. 4.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

Fig. 2 is a schematic structural diagram of a fiber laser large screen display device in an embodiment using the fiber laser wide projection device of the present invention, where the fiber laser wide projection device includes a red light laser source 201a, a green light laser source 201b, a blue light laser source 201c, a coupling lens group 202, a transmission device 203, a fixed body 204, a micro-coupling lens group 205, and a modulator 206, where the coupling lens group 202 includes a red light coupling lens 202a, a green light coupling lens 202b, and a blue light coupling lens 202 c. In the present embodiment, the fiber laser wide projection display device using the fiber laser wide projection display device of the present invention is described by taking the fiber laser wide projection display device and a large screen display as an example, and this fiber laser wide projection display device is referred to as a fiber laser large screen display device in the present invention. The fiber laser large screen display device includes, in addition to the above components, a scattering lens 207 and a display screen 208. The laser beams emitted by the red, green and blue laser light sources 201a, 201b and 201c are coupled into the transmission device 203 for transmitting the laser beams by the red, green and blue coupling lenses 202a, 202b and 202c, respectively, the output end of the transmission device 203 is fixed on the fixing body 204, and the laser beams transmitted by the transmission device 203 are focused, image-modulated and beam-expanded sequentially by the micro-coupling lens group 205, the modulator 206 and the scattering lens 207, and then projected onto the display screen 208 for imaging. Specific implementations of the above components are described below.

The red, green and blue laser sources 201a, 201b and 201c are used to provide light sources required for display in the present invention, and in this embodiment, three laser sources are used, wherein the red laser source 201a uses a red solid laser with a wavelength of 635nm, the green laser source 201b uses a green solid laser with a wavelength of 532nm, and the blue laser source 201c uses a blue solid laser with a wavelength of 457 nm. In order to improve the display effect of the display device, the three-color laser light sources of red, green and blue should satisfy the principle of power matching white balance, and specifically in this embodiment, the power matching ratio of the three-color laser light sources of red, green and blue is 1.3634:1:0.7510 according to the wavelengths of the three-color laser light sources of red, green and blue, so as to satisfy the white balance. The red, green and blue coupling lenses 202a, 202b and 202c shape and couple the laser light emitted from the red, green and blue laser light sources, respectively, into the transmission device 203. The number of the coupling lenses of the coupling lens group 202 is equal to the number of the laser light sources, and the coupling lens group 202 in this embodiment adopts 3 self-focusing lenses, which correspond to the three laser light sources of red, green and blue, respectively.

The transmission device 203 comprises a plurality of optical fibers which are divided into a plurality of bundles of optical fibers, one bundle of optical fibers being placed behind one coupling lens. At least one optical fiber is extracted from each bundle of optical fibers to form a group of optical fiber bundles, the group of optical fiber bundles form a pixel unit 209, each optical fiber in the pixel unit 209 conducts laser light of one color, each pixel unit 209 comprises optical fibers conducting all colors, at least one optical fiber conducting one color is conducted, and the light conducted by each pixel unit 209 meets the power proportion white balance principle. The optical fiber used in this embodiment is a conventional optical fiber having a core refractive index higher than that of the cladding. As can be seen from fig. 2, the red, green and blue lasers are coupled into the optical fiber bundle of the transmission device 203 by the red, green and blue coupling lenses 202a, 202b and 202c, respectively. The red, green and blue coupling lenses 202a, 202b and 202c are respectively corresponding to a bundle of optical fibers, each bundle of optical fibers is fixed to a bundle by a fastening ring, the number of optical fibers in the three bundles of optical fibers is equal, and the laser power transmitted by the optical fibers in the same bundle of optical fibers is the same, namely the laser power transmitted by the optical fibers transmitting the light with the same color is the same. Each bundle of optical fibers transmits the laser light transmitted by its corresponding coupling lens, for example, a bundle of optical fibers behind the red light coupling lens 202a is used to transmit the red light transmitted by the red light coupling lens 202 a. One optical fiber is selected from each of the three optical fiber bundles and recombined into a group of optical fiber bundles, and the group of optical fiber bundles form the pixel unit 209. The pixel cell 209 of fig. 2 is a fiber bundle consisting of three fibers that transmit red, green, and blue light, respectively. Because the number of the optical fibers in the three bundles of optical fibers is the same, the laser powers transmitted by the optical fibers in the same bundle of optical fibers are the same, and because the power ratio of the red-light, green-light and blue-light three-color laser light sources already meets the white balance principle, the light powers of the red light, the green light and the blue light transmitted by each pixel unit 209 also meet the white balance ratio.

There are also many ways to implement the arrangement of the fiber bundles in the pixel unit 209, one way is as shown in fig. 3, and all three fibers in the pixel unit 209 are arranged in an equilateral triangle in a manner of tangency every two and are wrapped together in a circle. The incident end of the pixel unit 209 (i.e. the incident end of the optical fiber bundle) is behind the coupling lens group, and the output end of the pixel unit 209 (i.e. the output end of the optical fiber bundle) is fixed on the fixing body 204. The fixing body 204 is provided with holes with the same number as the pixel units 209, the output ends of the pixel units 209 are arranged in the holes on the fixing body 204, and the output ends of all the pixel units 209 on the fixing body 204 are in the same plane and form a light output surface. In this embodiment, the pixel units 209 are arranged on the fixed body 204 in a rectangular shape in the manner shown in fig. 3, the fixed body 204 for fixing the pixel units 209 is also rectangular, the length of the fixed body 204 is L, and the width of the fixed body 204 is K, and the fixed body 204 is arranged according to the pixel unitsThe number of (a) is provided with M × N holes (M and N are positive integers, the number of rows is M, and the number of columns is N), and the M × N holes are used for installing the pixel units 209. The center transverse distance and the center longitudinal distance of each hole are both v, the M multiplied by N pixel units 209 are correspondingly inserted into the M multiplied by N holes of the fixing body 204 one by one and are fixed on the fixing body 204 by glue, and the size of each hole is determined according to the size of the pixel unit 209, so that the pixel units 209 can be arranged in the holes. The resolution of the display image of the display device of the present invention is related to the proportional relationship between the distance between the pixel units 209 and the distance between the display screen and the viewer, because the minimum resolution angle of human eyes is 0.3mrad, if the distance between the viewer and the display screen is U, and the viewer can clearly view the image on the display device, the distance v between the adjacent pixel units 209 and the distance U between the display screen and the viewer should satisfy the following relation:

<math> <mrow> <mi>U</mi> <mo>&GreaterEqual;</mo> <mfrac> <mi>v</mi> <mrow> <mn>2</mn> <mo>×</mo> <mi>tg</mi> <mn>0.00015</mn> </mrow> </mfrac> <mo>,</mo> </mrow></math>

the spacing of adjacent pixel elements 209 must take into account the screen-to-viewer distance to ensure image sharpness. Of course, the center of each hole may have different transverse and longitudinal pitches, but the transverse and longitudinal pitches also satisfy the above requirements. The number of pixel units 209 to be fixed on the fixing body 204 is related to the pixel requirement of the display device of the present invention, for example, in this embodiment, when M is 1024, N is 1280, that is, the pixel of the display device is 1024 × 1280, 1024 × 1280 holes are needed on the fixing body 204 to place 1024 × 1280 pixel units 209, that is, 3 × 1024 × 1280 optical fibers are needed in total.

After the light beam is transmitted through the pixel unit 209, the light beam is focused and image-modulated sequentially through the micro-coupling lens group 205 and the modulator 206. The micro-coupling lens group 205 includes a plurality of micro-coupling lenses for focusing and coupling the output light of the pixel unit 209 to the modulator, and the micro-coupling lenses correspond to the pixel units one by one. The modulator 206 includes a plurality of micro-modulation units, which correspond to the micro-coupling lenses one by one, in this embodiment, 1024 × 1280 micro-modulation units. Each fine modulation unit comprises a plurality of micro-modulators, the number of micro-modulators in each fine modulation unit corresponding to the number of optical fibers in the pixel unit 209 or to the number of colors of light conducted in the pixel unit 209, in this embodiment, the fine modulation unit employs 3 micro-liquid crystal modulators. In specific implementation, a spherical lens group is respectively fixed on an output end face of each pixel unit 209, and the implementation can be realized by a mechanical sleeve or welding method, etc., 3 micro liquid crystal modulators are respectively placed on an output light path of each spherical lens group, the spherical lens group respectively focuses 3 beams of red, green and blue light conducted by the corresponding pixel unit 209 onto the 3 micro liquid crystal modulators, and then the 3 micro liquid crystal modulators respectively modulate the red, green and blue light, the number of the required spherical lens groups is equal to the number of the pixel units 209, namely 1024 × 1280, and the number of the micro liquid crystal modulators is equal to the number of optical fibers in the transmission device 203, namely 1024 × 1280 × 3. In this embodiment, since the three optical fibers of the pixel unit 209 are closely arranged and have smaller diameters, the output beam of the pixel unit 209 may be approximately three paraxial beams incident on one micro-coupling lens, and three beams of light output may be obtained, and certainly, three micro-coupling lenses may be adopted to respectively correspond to the three optical fibers of one pixel unit 209, and if the number of the optical fibers in the pixel unit 209 is greater than three, the number of the micro-coupling lenses may also be correspondingly adjusted.

After modulation of the light beam is achieved, the beam divergence angle can be increased by a diffuser lens 207. The scattering lens 207 is disposed on the output optical path of the modulator 206, in this embodiment, the scattering lens 207 is a fresnel lens, and the image modulated by each of the tiny liquid crystal modulators is scattered by the fresnel lens and then projected to the display 208.

In the above embodiment, the optical fiber used in the pixel unit 209 is a conventional optical fiber having a core refractive index larger than that of the cladding, and in another embodiment of the present invention, an optical fiber having a special structure is used. Such fibers include two segments, as shown, for example, in fig. 4: the total reflection section 401 and the light leakage section 402, wherein the core refractive index of the total reflection section 401 is greater than the cladding refractive index, and light beams are totally reflected in the total reflection section 401 of the optical fiber; the core index of refraction of the light leaking section 402 is less than the cladding index of refraction and light will be transmitted out of the circumferential surface of the light leaking section 402 of the fiber. The optical fiber bundle in the pixel unit 209 adopts the light leakage section 402 only near one end of the fixed body 204, and adopts the total reflection section 401 in the rest part. When the optical fiber bundle in the pixel unit 209 is fixed on the fixing body 204, instead of directly installing the optical fiber ends in the fixing body 204 as a conventional optical fiber bundle, the light leakage section 402 of the optical fiber bundle is wound into a snake-shaped disc shape as shown in fig. 5 in the same plane, the light leakage section 402 of the snake-shaped disc shape forms a light emitting surface, then the light emitting surface is installed in the fixing body 204, and the light emitting surfaces formed by the optical fiber bundles of three colors are placed in an equilateral triangle to form the pixel unit as shown in fig. 5. Compared with the previous embodiment in which only the fiber ends are installed in the fixing body 204, the method has the advantages that the formed light emitting points are large, the mutual interval of the pixel units 209 can be effectively reduced, and the displayed picture is finer and smoother. Of course, the shape of the light leakage section 402 is not limited to the shape shown in fig. 5, fig. 5 is only an example, and the winding pitch and the winding shape of the light leakage section 402 may be changed in practical use as long as the shape and the pitch required for display are satisfied. After the optical fiber described in the embodiment is adopted, other components in the fiber laser large screen display device and the whole structure of the device can be kept unchanged.

In the two embodiments, the lengths of the optical fibers in the optical fiber bundles conducting the laser light of the same color are not equal, so that the optical path difference is generated by the light beams conducted in the optical fibers, and when the optical path difference satisfies that the optical path difference generated by the conducted light beams is not equal and is greater than the coherence length, the interference between the light beams of the color is weakened. The speckle effect in the projection display can be reduced by adjusting the length of the optical fiber so that the interference between the transmitted light beams of each color is reduced.

The above is a description of the large-screen fiber laser display device using the wide fiber laser projection device of the present invention, and the display device may be further applied, for example, two or more groups of fiber laser display devices are combined together to form a display device with a larger area. The type of the light source used in the invention is not limited to a solid laser, and other types of lasers, such as a semiconductor laser, a fiber laser or a gas laser, can be applied to the invention, and besides the red, green and blue three-color laser light sources respectively have one laser, the number of the light sources can be changed on the premise of meeting the three-color laser light sources, for example, two red light sources are provided, and one is provided for each of a green light source and a blue light source, so long as the three-primary-color light sources generally meet the power matching white balance principle. Of course, it should be understood by those skilled in the art that the light source may be a light source of four primary colors, five primary colors or more, besides the laser light sources of three primary colors of red, green and blue, as long as the light sources satisfy the principle of multi-primary power matching white balance. In addition, lasers capable of emitting lasers of multiple colors can be used, and for such lasers, the number of light sources can be determined according to the number of paths for emitting lasers, for example, one light source device is composed of two lasers, one laser emits two paths of lasers which respectively provide red light and blue light, the other laser only emits one path of green light, and the light source device is regarded as having three laser light sources. The coupling lenses of the coupling lens group 202 may be, besides the self-focusing lens, a cylindrical lens, an aspheric lens or a spherical lens group, the number of the coupling lenses is equal to the number of the light sources and corresponds to one another, and the number of the coupling lenses can be adaptively adjusted according to the number of the light sources, for example, if one light source device has two red light sources, one green light source and one blue light source, the number of the coupling lenses needs to be adjusted to 4 to respectively correspond to 4 light sources, the bundle of the optical fibers is also adjusted to 4, the number of the optical fibers in the pixel unit is also adjusted to 4, 2 optical fibers conduct red light, 1 optical fiber conducts blue light and 1 optical fiber conducts green light, correspondingly, the number of the micro-modulators in the micro-modulation unit may be 4 or 3, and two bundles of red light share one micro-modulator in case of 3. The number of optical fibers contained in the optical fiber bundle of the pixel unit 209 can be adaptively adjusted according to the number of light sources and the total number of optical fibers. For example, when the number of the red, green and blue light sources is 3, but the number of the optical fibers for conducting the green laser light source and the blue laser light source is equal, and the number of the optical fibers for conducting the red laser light source is twice the number of the optical fibers for conducting the green laser light source, the number of the optical fibers for the optical fiber bundle of the pixel unit 209 is also adjusted to 4 accordingly, 2 of them are used for conducting red light, and accordingly the number of the micro-modulators in each of the micro-modulation units on the subsequent optical path is adjusted to 4, or 3, in which case, two optical fibers for conducting red light share one micro-modulator. Of course, as the conditions change, the number of optical fibers of the optical fiber bundle of the pixel unit 209 can be adjusted to 5 or 6 or even more. It can be understood by those skilled in the art that as the number of optical fibers of the optical fiber bundle of the pixel unit 209 varies, the overall shape of the pixel unit 209 wrapping the optical fibers may also be square, trapezoid, circular ring, etc., the optical fibers of the optical fiber bundle of the pixel unit 209 may be arranged in other shapes such as "one", "i" or "tian" shape, etc., and the pitch of the optical fibers may also vary according to actual needs. Besides being in the same plane, the output ends of all the pixel units 209 may also be in the same smooth concave surface or the same smooth convex surface or in another relatively smooth light output surface capable of meeting the requirement of projection imaging, and besides the arrangement manner of the pixel units 209 shown in fig. 3, other arrangement manners may also be adopted, for example, two adjacent pixel units 209 are arranged in the shape of an equilateral triangle, in short, the arrangement manner only needs to meet the requirement of imaging.

The micro-coupling lens in the micro-coupling lens group 205 may be an aspheric lens, besides a spherical lens group, or the output end of the pixel unit 209 may be ablated to be spherical, so as to have a function of increasing a divergence angle, and thus the micro-coupling lens group 205 may be omitted. Besides the micro liquid crystal modulator, the modulator 206 may also employ a volume Bragg Grating (Vo1ume Bragg Grating), which all achieve the corresponding modulation effect. Besides the fresnel lens, the scattering lens 207 may also be a spherical lens group or an aspheric lens. The display 208 may also be eliminated. Of course, the diffusion lens 207 and the display 208 may be replaced by a display having diffusion properties.

The wide-width fiber laser projection device of the present invention can be applied to the large-screen fiber laser display device in the above embodiments, and can also be applied to other fields, such as an illumination device and a laser phototypesetter that use a laser projection mode to realize illumination.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A fiber laser broad-width projection device comprises a light source, a coupling lens group (202), a transmission device (203), a fixed body (204) and a modulator (206); wherein,

the coupling lens group (202) performs shaping coupling on the light emitted by the light source, then transmits the light after shaping coupling into the transmission device (203), and the output end of the transmission device (203) installed on the fixed body (204) emits the light, and the light is modulated by the modulator (206) after the output end of the transmission device (203) emits the light;

the transmission device comprises a plurality of optical fibers, the optical fibers are divided into a plurality of bundles of optical fibers, and the bundles of optical fibers are placed behind the coupling lens and correspond to the coupling lens one by one; the optical fiber bundles transmit light of the same color, and the optical power transmitted by the optical fibers in the same optical fiber bundle is the same; at least one optical fiber in each bundle of optical fibers forms a group of optical fiber bundles, the group of optical fiber bundles form a pixel unit (209), each optical fiber in the pixel unit (209) conducts light of one color, at least one optical fiber conducting one color is used, each pixel unit (209) conducts red light, green light and blue light, and the conducted light meets the power proportion white balance principle; the modulator (206) comprises a plurality of micro-modulation units, the micro-modulation units correspond to the pixel units one by one, and each micro-modulation unit comprises a plurality of micro-modulators; the number of micro-modulators in each micro-modulation unit corresponds to the number of optical fibers in the pixel unit (209) or to the number of colors of light conducted by the pixel unit, and the plurality of micro-modulators in each micro-modulation unit modulate red, green and blue light, respectively.

2. The fiber laser broad projection device of claim 1, further comprising a micro-coupling lens group (205), wherein the micro-coupling lens group (205) is located between the fixed body (204) and the modulator (206) for focusing the light transmitted through the transmission device (203).

3. The fiber laser broad projection apparatus according to claim 1 or 2, wherein the light source comprises at least three primary color light sources, and the light sources satisfy the power matching white balance principle.

4. The fiber laser broad projection apparatus of claim 3, wherein the light source is a solid laser, a semiconductor laser, a fiber laser or a gas laser.

5. The fiber laser broad width projection device according to claim 1 or 2, wherein the coupling lens group (202) comprises coupling lenses for respectively transmitting the light sources, and the number of the coupling lenses is consistent with the number of the light sources.

6. The fiber laser broad projection apparatus of claim 5, wherein the coupling lens is a self-focusing lens, a cylindrical lens, an aspherical lens or a spherical lens group.

7. The fiber laser broad projection device of claim 1, wherein the fixing body (204) comprises a plurality of holes for placing the pixel units (209), the holes correspond to the pixel units (209) one by one, and the output ends of all the pixel units (209) are in the same light output plane.

8. The fiber laser broad projection apparatus of claim 1, wherein the pixel unit (209) employs a conventional fiber having a core refractive index greater than a cladding refractive index.

9. The fiber laser broad width projection device of claim 8, wherein the output ends of the pixel units (209) are integrated by the output end surfaces of the conventional optical fibers to form a light emitting surface, and the light emitting surface is installed in the fixing body (204).

10. The fiber laser broad projection device of claim 1, wherein the pixel unit (209) is an optical fiber comprising a total reflection section (401) and a light leakage section (402), wherein the refractive index of the core of the total reflection section (401) is greater than that of the cladding, and the light beam is totally reflected in the optical fiber; the core index of refraction of the light-leaking section (402) is less than the cladding index of refraction and light is transmitted out of the circumferential surface of the optical fiber.

11. The fiber laser broad projection device of claim 10, wherein the output end of the pixel unit (209) adopts the light leakage section (402), the rest adopts the total reflection section (401), the light leakage section (402) of each fiber is wound in a plane to form a light emitting source, and all the light emitting sources are installed in the fixed body (204) to form a light emitting surface.

12. The fiber laser broad projection apparatus of claim 1, wherein there is a length difference between the fibers for transmitting the lasers of the same color, and the optical path difference generated by the light transmitted in the fibers for transmitting the lasers of the same color is larger than the coherence length.

13. The fiber laser broad projection apparatus of claim 12, wherein the micro-modulator is a micro-liquid crystal modulator or a volume bragg grating.

14. The fiber laser broad projection device of claim 2, wherein the micro-coupling lens group (205) comprises a plurality of micro-coupling lenses, each micro-coupling lens is fixed on the output end face of the pixel unit (209) and corresponds to the pixel unit one by one.

15. The fiber laser broad projection apparatus of claim 14, wherein the micro-coupling lens is mounted behind each micro-coupling lens, and the micro-coupling lenses are in one-to-one correspondence with the micro-coupling units.

16. A fiber laser large screen display device, comprising the fiber laser wide projection device according to any one of claims 1 to 15.

17. The fiber laser large screen display device according to claim 16, further comprising a scattering lens (207) for increasing a scattering angle of the light modulated by the modulator (206) and scattering the light out.

18. The fiber laser large screen display device according to claim 16 or 17, further comprising a display screen (208) for displaying.

19. The large screen display device of claim 17, wherein the scattering lens (207) is a fresnel lens, a spherical lens group or an aspheric lens.