Laser light source and laser display device

Abstract

The invention provides a laser light source and laser display equipment. The laser light source comprises a first laser, a second laser, a wavelength conversion device, a light splitting device and a diffusion device. The first laser beam enters the light splitting device in the first direction, the first light beam enters the wavelength conversion device in the second direction, the wavelength conversion device generates a third laser beam with a third wavelength based on the light beam with the first wavelength, and the third laser beam enters the light splitting device, is transmitted by the light splitting device and reaches the light combining area; the second light beam enters the diffusion device along the first direction, is reflected to the light splitting device by the diffusion device, is reflected again by the light splitting device and reaches the light combining area; the second laser beam enters the diffusion device, is transmitted by the diffusion device, enters the light splitting device, is reflected by the light splitting device and reaches the light combining area. The double-color laser is adopted as the light source, the diffusion device is used for optimizing the overall light path structure, the brightness of the output color of the overall laser light source is improved, and the size of the light source is reduced.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and more specifically, to a laser light source and a laser display device. Background Art

[0002] Laser light source is a light source with high brightness, strong directionality and monochromatic related light beams. Due to its many advantages, it has been gradually applied to the fields of projection and display in recent years. In the field of laser display, a single blue laser is usually used as the laser light source. By using a fluorescent wheel as a wavelength conversion device, the blue laser excites the phosphor to produce three primary colors. However, this method makes it impossible for the light emitted by the light source to achieve a wide color gamut and cannot meet the increasingly high color requirements of projection products and display products on the market.

[0003] Compared with monochromatic laser light sources, some laser light source devices use two-color laser light sources or three-color laser light sources. Multi-color laser light source devices can improve the color purity, color brightness, and color gamut of the light source, and better meet the color requirements of laser projection equipment and laser display equipment; however, multi-color laser light source devices are more expensive and have more complex optical paths, resulting in a larger overall light source volume; seeking high cost-effectiveness, meeting the market's color display needs, and miniaturization of light sources have been hot research directions in recent years. Summary of the invention

[0004] The present application provides a laser light source and a laser display device. The laser light source uses a two-color laser as a light source and uses a diffusion device to optimize the overall optical path structure, thereby increasing the overall color gamut of the laser light source output color, thereby improving the light energy utilization rate and the brightness of the overall laser light source output color; by optimizing the optical path of the laser light source, the volume of the light source is reduced, and the number of related optical devices in the light source is reduced, so as to effectively control the cost of the light source.

[0005] In the first aspect, a laser light source is provided, comprising a first laser, a second laser, a wavelength conversion device, a spectrometer, and a diffusion device. The first laser, the spectrometer, the diffusion device, and the second laser are arranged in sequence along a first direction, the first direction being the propagation direction of a first laser beam having a first wavelength emitted by the first laser, and the second laser is arranged opposite to the first laser. The spectrometer and the wavelength conversion device are arranged in sequence along a second direction, and the second direction is perpendicular to the first direction. The first laser beam is incident on the spectrometer along the first direction, and the spectrometer is used to split the incident first laser beam into a first beam by reflection and into a second beam by transmission. The first beam is incident on the wavelength conversion device along the second direction, and the wavelength conversion device generates a third laser beam having a third wavelength based on the beam of the first wavelength, and the third laser beam is incident on the spectrometer, transmitted by the spectrometer, and reaches the light combining area. The second beam is incident on the diffusion device along the first direction, and the diffusion device is used to homogenize the incident beam, and the diffusion device reflects the beam of the first wavelength and transmits the beam of the second wavelength; the second beam is reflected by the diffusion device to the spectrometer, and is reflected again by the spectrometer, and reaches the light combining area. The second laser is used to emit a second laser beam with a second wavelength. The second laser beam enters the diffusion device, is transmitted by the diffusion device and enters the light splitting device, is reflected by the light splitting device, and reaches the light combining area.

[0006] Based on this technical solution, a two-color laser is used as a laser light source, and a wavelength conversion device is used to excite a light beam of a third wavelength. The overall optical path is arranged by the relative positions of the light splitting device and the diffusion device to change the propagation direction of the laser light beam emitted by the laser and optimize the overall optical path. This increases the overall color gamut of the color output by the laser light source, improves the utilization rate of light energy, and improves the vividness of the color output by the overall laser light source; and by optimizing the optical path of the laser light source, the volume of the light source is reduced, and the number of related optical devices in the light source is reduced, so as to effectively control the cost of the light source.

[0007] It should be understood that in one embodiment provided in the present application, the first laser includes a blue laser, the second laser includes a red laser, and the wavelength conversion device includes a fluorescence conversion wheel, which generates a yellow fluorescence beam based on stimulated radiation of an incident blue laser beam. The one possible embodiment provided in the present application is only one possible implementation of the present application, and the specific protection scope shall be subject to the claims, and the present application does not make any special limitation on this.

[0008] It should be understood that in one embodiment provided in the present application, the light splitting device includes a dichroic plate, which has dichroic properties, including transmitting a blue light beam and reflecting a red light beam; at the same time, the dichroic plate also has a light splitting effect, which can partially transmit a blue light beam and partially reflect a blue light beam, and divide the first laser beam emitted by the first laser into a first light beam and a second light beam. The specific protection scope shall be subject to the claims, and the present application does not make any special limitation on this.

[0009] It should be understood that in one embodiment provided in the present application, the blue laser and the red laser are arranged relative to each other and emit light in opposite directions. The light emission direction of the blue laser is opposite to the light emission direction of the red laser. The light emission axis of the blue laser is parallel to the light emission axis of the red laser. In a possible implementation, the light emission axis of the blue laser coincides with the light emission axis of the red laser. The specific protection scope shall be subject to the claims, and the present application does not make any special limitation on this.

[0010] It should be understood that in one embodiment provided in the present application, the spectrometer forms an angle of 45 degrees with the optical axis of the blue laser light beam emitted by the blue laser, and the spectrometer splits the blue light beam in a ratio of 70% reflection and 30% transmission. The specific scope of protection shall be subject to the claims, and the present application does not make any special limitation on this.

[0011] In combination with the first aspect, in some implementations of the first aspect, the diffusion device includes a diffusion sheet, wherein the first surface of the diffusion sheet is a diffuse reflection surface, the second surface is a dichroic surface, the first surface is not adjacent to the second surface, and the diffusion sheet performs periodic motion.

[0012] Based on the technical solution, by designing a diffuse reflection surface and a dichroic surface on two non-adjacent surfaces of the diffuser of the diffusion device, one diffuser has two optical properties, which can not only diffusely reflect the incident light beam, increase the diversity of the outgoing light beam angle, and homogenize the incident light beam to eliminate the coarse speckle of the projection image; but also transmit a light beam of one wavelength and reflect a light beam of another wavelength through the wavelength selection of the dichroic surface, so as to reasonably optimize the light path, reduce the volume of the light path, and reduce the volume of the light source.

[0013] It should be understood that the material of the diffuser includes silicon, etc. The diffuser has four sides with smaller surface areas and two planes with larger surface areas. The first surface and the second surface include two planes with larger surface areas, and the two surfaces are relatively non-adjacent. The diffuse reflection surface includes a surface processed by optical processes such as etching on a silicon substrate, and the dichroic surface includes a surface processed by optical processes such as coating on a silicon substrate. The specific scope of protection shall be subject to the claims, and the present application does not make any special limitation on this.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the diffusion device also includes a driving device, which is used to drive the diffusion plate to rotate; the diffusion plate is coaxial with a mechanical shaft of the driving device, and the mechanical shaft is parallel to the first direction.

[0015] Based on this technical solution, the diffuser rotates around the mechanical shaft of the driving device under the action of the driving device. Driving the diffusion device to rotate can increase the randomness of the incident light beam passing through the diffuse reflection surface, enhance the uniform light effect of the incident light beam, and further eliminate the coarse speckle that may appear in the projection image.

[0016] It should be understood that the driving device includes a device such as a motor that can drive the diffusion plate to rotate. The specific scope of protection shall be based on the claims, and this application does not make any special limitations on this.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the diffusion device also includes a driving device, which is used to drive the diffusion plate to perform translational motion; the diffusion plate performs periodic translational motion parallel to the second direction and / or the third direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other.

[0018] Based on the technical solution, the diffuser performs periodic translational motion along the second direction and / or the third direction under the action of the driving device. Driving the translational motion of the diffusion device can increase the randomness of the incident light beam passing through the diffuse reflection surface, enhance the uniform light effect of the incident light beam, and further eliminate the coarse speckle that may appear in the projection image.

[0019] It should be understood that the driving device includes an electromagnetic device or other device that can drive the diffuser to translate. Under the action of the electromagnetic device, the diffuser makes a translational motion in a plane perpendicular to the main optical axis, where the main optical axis is the optical axis of the first laser beam emitted by the first laser. The specific scope of protection shall be subject to the claims, and this application does not make any special limitation on this.

[0020] It should be understood that a rectangular coordinate system is established with the first direction as a reference direction, and any two of the first direction, the second direction, and the third direction are perpendicular to each other. The specific scope of protection shall be subject to the claims, and this application does not make any special limitation on this.

[0021] It should be understood that there are three possible situations in which the diffuser performs periodic translational motion parallel to the second direction and / or the third direction: the diffuser performs periodic translational motion only parallel to the second direction in a plane perpendicular to the principal optical axis; the diffuser performs periodic translational motion only parallel to the third direction in a plane perpendicular to the principal optical axis; the translational motion trajectory of the diffuser in a plane perpendicular to the principal optical axis is parallel to the second direction for a period of time, parallel to the third direction for a period of time, and performs periodic motion; the specific scope of protection shall be subject to the claims, and the present application does not make any special limitation on this.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the laser light source also includes a first lens group, which is arranged along a first direction on a light path between the spectrometer and the diffuser, and is used to converge the incident second light beam and the second laser beam.

[0023] Based on the technical solution, the first lens group converges the second light beam and the second laser beam emitted from the diffusion device, and converges the second light beam and the second laser beam diffused by the diffuse reflection surface of the diffusion device, so that the converged light beam reaches the light splitting device and is reflected to the light combining area. The first lens group further optimizes the optical path of the laser light source and improves the image quality of the projected picture.

[0024] It should be understood that the first lens group has the function of converging the light beam, and the present application does not specifically limit the optical path between the specific lenses in the lens group and the optical parameters of the lenses.

[0025] In combination with the first aspect, in certain implementations of the first aspect, the laser light source further includes a second lens group, which is arranged along the first direction on the optical path between the diffusion device and the second laser, and the second lens group is used to converge the incident second laser beam.

[0026] Based on this technical solution, the second lens group is used to converge the incident second laser beam, and the converged second laser beam is incident on the diffusion device for uniform light. The second lens group further optimizes the optical path of the laser light source and improves the image quality of the projection screen.

[0027] It should be understood that the second lens group has the function of converging the light beam, and the present application does not specifically limit the optical path between the specific lenses in the lens group and the optical parameters of the lenses.

[0028] In combination with the first aspect, in certain implementations of the first aspect, the laser light source also includes a third lens group, which is arranged along the second direction on the optical path between the spectroscopic device and the wavelength conversion device, and the third lens group is used to converge the incident first light beam and the third laser beam.

[0029] Based on the present technical solution, the third lens group converges the first light beam that is about to be incident on the wavelength conversion device, so that the first light beam can be incident on the light beam receiving area of ​​the wavelength conversion device in a more concentrated manner; the third lens group also converges the third laser beam emitted by the wavelength conversion device, and then the third laser beam transmits the spectrometer to reach the light combining area; the third lens group further optimizes the optical path of the laser light source and improves the image quality of the projected picture.

[0030] It should be understood that the third lens group has the function of converging the light beam, and the present application does not specifically limit the optical path between the specific lenses in the lens group and the optical parameters of the lenses.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the laser light source further includes a beam expander, which is arranged on the light output side of the second laser, and is used to expand the divergence angle of the incident second laser beam.

[0032] Based on this technical solution, since the number of light emitting particles of the second laser is small, a beam expansion device is added to expand the second laser beam emitted by the second laser to improve the laser beam stability and eliminate radial chromatic aberration, thereby further improving the beam quality and imaging clarity.

[0033] It should be understood that the beam expansion device includes optical devices such as a beam expansion prism and a beam expansion lens group. The specific scope of protection shall be subject to the claims, and this application does not make any special limitations on this.

[0034] In combination with the first aspect, in certain implementations of the first aspect, the laser light source also includes a first 1 / 4 wave plate, which is arranged on the light output side of the first laser, and the first 1 / 4 wave plate is used to convert the incident first laser beam from linearly polarized light to circularly polarized light.

[0035] Based on this technical solution, the first 1 / 4 wave plate is used to convert the incident first laser beam from linearly polarized light into circularly polarized light. The rotational symmetry of the circularly polarized light and the property of being unaffected by the optical path difference can further improve the image quality of the projected picture, and further improve the beam quality and imaging clarity.

[0036] In combination with the first aspect, in certain implementations of the first aspect, the laser light source also includes a second 1 / 4 wave plate, which is arranged on the optical path of the second laser beam, and the second 1 / 4 wave plate, the beam expander, and the second laser are arranged in sequence along the first direction, and the second 1 / 4 wave plate is used to convert the incident second laser beam from linearly polarized light to circularly polarized light.

[0037] Based on this technical solution, the second 1 / 4 wave plate is used to convert the incident second laser beam from linearly polarized light into circularly polarized light. The rotational symmetry of circularly polarized light and its property of being unaffected by optical path difference can further enhance the image quality of the projected picture, and further improve the beam quality and imaging clarity.

[0038] In combination with the first aspect, in certain implementations of the first aspect, the laser light source also includes a first diffuser plate, which is arranged along a first direction on the optical path between the first 1 / 4 wave plate and the spectrometer, and the first diffuser plate is used to diffusely reflect and diffuse the incident first laser beam to homogenize the first laser beam.

[0039] Based on the technical solution, the first diffuser is used to diffuse the incident first laser beam, increase the angle diversity of the first laser beam, enhance the uniform light effect of the first laser beam, and further eliminate the coarse speckle that may appear in the projection image.

[0040] In combination with the first aspect, in certain implementations of the first aspect, the laser light source also includes a second diffuser plate, which is arranged on the optical path of the second laser beam. The second diffuser plate, the second quarter wave plate, the beam expander, and the second laser are arranged in sequence along the first direction. The second diffuser plate is used to diffusely reflect and diffuse the incident second laser beam to homogenize the second laser beam.

[0041] Based on the technical solution, the second diffuser is used to diffuse the incident second laser beam, increase the angle diversity of the second laser beam, enhance the uniform light effect of the second laser beam, and further eliminate the coarse speckle that may appear in the projection image.

[0042] In a second aspect, a laser display device is provided, which includes a laser light source, a light valve assembly and a projection lens according to the first aspect or various implementations of the first aspect; wherein the light valve assembly is arranged on the light output side of the laser light source, and is used to modulate the three-color laser output by the laser light source and emit it to the projection lens; the projection lens is used to project the incident three-color laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the optical path structure of a commonly used dual-color laser light source provided in an embodiment of the present application;

[0044] Figure 2 This is a schematic diagram of the optical path structure of a commonly used monochromatic laser light source provided in an embodiment of the present application;

[0045] Figure 3 This is a schematic diagram of the optical path structure of a laser light source provided in an embodiment of the present application;

[0046] Figure 4 It is a schematic diagram of the structure of a diffuser in a diffuser device of a laser light source provided in an embodiment of the present application;

[0047] Figure 5 It is a motion schematic diagram of a rotating diffusion device in a laser light source provided in an embodiment of the present application;

[0048] Figure 6 is a schematic diagram of the movement of another translational diffusion device in a laser light source provided in an embodiment of the present application;

[0049] Figure 7 is a schematic diagram of the optical path structure of another laser light source provided in an embodiment of the present application;

[0050] Figure 8 It is a schematic diagram of the optical path dimensions of a laser light source provided in an embodiment of the present application and a commonly used two-color laser light source;

[0051] Fig. 9It is a structural schematic diagram of a laser display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0053] It should be noted that, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two, and "at least one" and "one or more" mean one, two or more. The singular expressions "a", "an", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.

[0054] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0055] In the description of the embodiments of the present application, the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "vertical" and "horizontal" are defined relative to the directions or positions of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, rather than indicating or implying that the device or component referred to must have a specific direction, or be constructed and operated in a specific direction. They may change accordingly according to changes in the directions of the components placed in the drawings, and therefore cannot be understood as limitations on the present application.

[0056] In the embodiments of the present application, the same reference numerals are used to represent the same components or the same components. In addition, the components in the drawings are not drawn to scale, and the sizes and dimensions of the components shown in the drawings are only exemplary and should not be understood as limiting the present application.

[0057] With the development of optoelectronic technology, laser display devices are being used more and more widely, and the requirements for the display effect of laser display devices and the projected projection images are becoming higher and higher. Laser display devices may include laser projection devices, laser TVs, transmissive liquid crystal displays (LCD), three-panel liquid crystal on silicon (3-LCoS), etc. The laser light source in the laser display device is used to emit lasers of multiple colors. The higher the symmetry of the lasers of multiple colors, the higher the overlap, and the higher the uniformity of the light mixing, the better the display effect of the projection image formed based on the laser.

[0058] In the field of laser display, a single blue laser is usually used as the laser light source, and a phosphor wheel is used as a wavelength conversion device to generate three primary colors of light through the blue laser exciting the phosphor. However, this approach makes it impossible for the light emitted by the light source to achieve a wide color gamut, and cannot meet the increasingly high color requirements of projection products and display products on the market.

[0059] In order to achieve higher brightness, higher color gamut coverage, and better imaging quality, some laser light sources use dual-color laser light sources or tri-color laser light sources. Compared with monochromatic laser light sources, multi-color laser light source equipment can improve the color purity, color brightness, and color gamut of the light source, and better meet the color requirements of laser projection equipment and laser display equipment; however, multi-color laser light source equipment is more expensive and has a more complex optical path, resulting in a larger overall light source volume.

[0060] Generally, the optical path structure diagram of the commonly used two-color laser light source is as follows Figure 1As shown, the two-color laser light source has a red laser 11 and a blue laser 12. The red laser beam emitted by the red laser 11 is incident on the dichroic plate 13, and the dichroic plate 13 transmits red light and reflects blue light. After being transmitted from the dichroic plate 13, the red laser beam is incident on the reflector 15, and the reflector 15 is at a 45-degree angle to the incident red laser beam. The reflector 15 emits the reflected red laser beam, and the reflected red laser beam is incident on the dichroic plate 16 and emitted to the light combining area. After the blue laser beam emitted by the blue laser 12 passes through the blue light splitter 14, a part of the blue light is reflected by the blue light splitter 14, and the other part of the blue light is transmitted by the blue light splitter 14; the reflected blue laser beam is incident on the dichroic plate 13, and after being reflected by the dichroic plate 13 and changing the direction of the optical path, it is the same as the optical path of the red laser beam, and is incident on the reflector 15 and reflected. The blue laser beam emitted after reflection is incident on the dichroic plate 16 and emitted to the light combining area. The blue laser beam transmitted through the blue light splitter 14 is incident on the dichroic plate 16 and transmitted, and is incident on the fluorescence conversion device 17. The blue laser beam excites the fluorescence conversion device 17 to generate a yellow light beam. The generated yellow light beam is reflected by the dichroic plate 16 and arrives at the light combining area, and is combined with the red laser beam and the blue laser beam.

[0061] from Figure 1 It can be seen that the overall optical path of the two-color laser light source is rectangular. Although the loss of blue laser light output efficiency is avoided as much as possible, an additional blue laser circuit is added for light combination, which increases the volume of the overall light source. It can be seen that the optical path volume of the existing two-color laser light source is large, and the square optical path is difficult to debug and requires high firmware accuracy. Common monochromatic laser light sources can effectively reduce the volume of the light source. The optical path structure diagram of the commonly used monochromatic laser light source is shown in the figure. Figure 2 shown.

[0062] Figure 2 The monochromatic laser light source shown uses a blue laser 21. The blue laser beam emitted by the blue laser 21 passes through a blue quarter wave plate 22 and a micro lens array (MLA) 23 and then enters a dichroic plate 24. A portion of the blue laser beam is transmitted by the dichroic plate 24, and the other portion is reflected. The reflected blue laser beam passes through a lens group 25 and enters a fluorescence conversion device 27 to generate yellow fluorescence and red fluorescence, which are then emitted through the dichroic plate 24. The blue laser beam transmitted by the dichroic plate 24 passes through the lens group 25 and then enters a diffuse reflection device 26. The diffuse reflection device 26 evens the incident blue laser beam and then reflects it again to the lens group 25 and converges it to the dichroic plate 24. After being reflected by the dichroic plate 24, it is combined with the transmitted yellow fluorescence and red fluorescence.

[0063] from Figure 2It can be seen that although the optical path of the monochromatic laser light source can greatly reduce the volume of the light source compared to the two-color laser light source, only a monochromatic blue laser is used to excite the other two-color light beams through the fluorescence conversion device and combine the light. Since the fluorescence spectrum excited by the fluorescence conversion device is too wide, the saturation and brightness of the excited light beam cannot be compared with the quality of the light beam directly emitted by the laser. This results in the color gamut coverage and imaging quality of the monochromatic laser light source being unable to meet the needs of the laser display market.

[0064] Compared with monochromatic laser light sources and two-color laser light sources, three-color laser light sources can have color gamut coverage and better imaging quality, but three lasers also mean higher economic costs. How to improve the imaging quality of laser light sources and reduce the size of the light source while effectively controlling the economic costs has become a problem to be solved.

[0065] The present application provides a laser light source and a laser display device. The laser light source uses a two-color laser as a light source and uses a diffusion device to optimize the overall optical path structure, thereby increasing the overall color gamut of the laser light source output color, thereby improving the light energy utilization rate and the brightness of the overall laser light source output color; by optimizing the optical path of the laser light source, the volume of the light source is reduced, and the number of related optical devices in the light source is reduced, so as to effectively control the cost of the light source.

[0066] The embodiment of the present application provides a two-color laser light source, which emits a blue laser beam and a red laser beam respectively through a blue laser and a red laser, and uses a spectrometer to split the blue laser beam. A part of the blue laser beam enters a wavelength conversion device to excite a fluorescent device to convert yellow fluorescence, and the other part of the blue laser beam is shaped by an optical element and then combined with the yellow fluorescence and the red laser beam. The embodiment of the present application provides a diffusion device, which diffuses the incident light beam to eliminate the coarse speckle displayed by the light source. At the same time, the diffusion device also has dichroism, which reflects the blue light beam and transmits the red light beam, thereby changing the optical path direction of the laser, optimizing the optical path structure of the light source, reducing the optical path volume, and reducing the number of related optical devices in the light source, so as to effectively control the cost of the light source.

[0067] A schematic diagram of the optical path structure of a laser light source provided in an embodiment of the present application is as follows Figure 3 As shown. The overall laser light source includes two lasers, namely a blue laser 31 and a red laser 32. The propagation direction of the blue light beam emitted by the blue laser 31 is used as a reference and defined as the first direction. The blue laser 31 and the red laser 32 are arranged relative to each other along the first direction, the light-emitting axis of the red laser 32 is parallel to the light-emitting axis of the blue laser 31, the light-emitting directions of the red light beam and the blue light beam are opposite, and the two light beams propagate in opposite directions.

[0068] In one implementation, the embodiments provided in the present application are described with the first direction being the X direction. It should be understood that the first direction may also include the Y direction or the Z direction, and the present application does not specifically limit this.

[0069] Optionally, in one implementation, the light-emitting optical axis of the red laser 32 is parallel to and coincides with the light-emitting optical axis of the blue laser 31 , which is not particularly limited in the present application.

[0070] It should be understood that in the embodiments provided in the present application, the first laser includes a blue laser 31, the second laser includes a red laser 32; the first laser beam having a first wavelength includes a blue laser beam, and the second laser beam having a second wavelength includes a red laser beam. The embodiments provided in the present application do not constitute any limitation on the protection scope of the claims, and the specific protection scope shall be subject to the claims.

[0071] It should be understood that in some embodiments, the blue laser beam is also referred to as a blue laser beam, a blue beam, a blue light beam, etc., which is only a difference in name and does not constitute any limitation on the protection scope of the claims. The specific protection scope shall be subject to the claims.

[0072] It should be understood that in some embodiments, the red laser beam is also referred to as a red laser beam, a red beam, a red light beam, etc., which is only a difference in name and does not constitute or limit the protection scope of the claims. The specific protection scope shall be subject to the claims.

[0073] It should be understood that in some embodiments, a blue laser is also referred to as a blue light laser, etc., and a red laser is also referred to as a red light laser, etc. These are merely differences in name and do not constitute or limit the protection scope of the claims. The specific protection scope shall be subject to the claims.

[0074] The blue light beam emitted by the blue laser 31 propagates along the X direction, and the light beam is incident on the dichroic plate 35. The dichroic plate 35 forms an angle of 45 degrees with the optical axis of the blue laser beam. The dichroic plate 35 splits the blue light beam, and a part of the blue light beam is transmitted through the dichroic plate 35 and continues to propagate along the X direction; the other part of the blue light beam is reflected by the dichroic plate 35, and the reflected blue light beam is 90 degrees to the X direction. This propagation direction is defined as the Y direction. Based on the X direction and the Y direction, the Z direction is defined; among the X direction, the Y direction and the Z direction, any two directions are perpendicular to each other.

[0075] It should be understood that the dichroic film 35 used in the embodiment provided in the present application reflects 70% of the blue light beam and projects 30% of the blue light beam. The dichroic film 35 reflects part of the blue light beam and projects part of it. The reflection and projection ratio of the specific light beam is determined by the product properties of the dichroic film 35, and the present application does not make any special limitation on this.

[0076] The blue light beam reflected by the dichroic film 35 enters the wavelength conversion device 37 for wavelength conversion. The wavelength conversion device 37 is arranged on one side of the dichroic film 35 along the Y direction.

[0077] In the embodiment provided by the present application, the wavelength conversion device 37 includes a fluorescence conversion device, and the blue laser beam is incident on and excites the fluorescent material, so that the fluorescence conversion device generates yellow fluorescence, and the yellow fluorescence generated and emitted by the wavelength conversion device 37 propagates in the opposite direction of the Y direction and is incident on the dichroic plate 35, and the dichroic plate 35 transmits the yellow fluorescence. The yellow fluorescence beam is transmitted from the dichroic plate 35, reaches the light combining area, and combines with other light beams.

[0078] It should be understood that in the embodiments provided above, the fluorescence conversion device can be excited by a blue laser and produce yellow fluorescence. The specific scope of protection shall be subject to the claims, and this application does not make any special limitation on this.

[0079] It should be understood that the wavelength conversion device 37 is arranged on one side of the dichroic film 35 along the Y direction, and the relative position of the wavelength conversion device 37 and the optical axis of the blue light beam reflected by the dichroic film 35 is determined by the specific structure and characteristics of the wavelength conversion device 37, so as to achieve the reflected blue light beam entering the excitation area of ​​the wavelength conversion device 37 so that the wavelength conversion device 37 emits fluorescence after wavelength conversion. The present application does not make any special limitation on the relative position between the wavelength conversion device 37 and the optical axis of the reflected blue light beam.

[0080] The blue laser beam transmitted through the dichroic plate 35 is incident on the diffusion device 38 along the X direction. The diffusion device 38 has dichroism, reflects the blue beam, and transmits the red beam. The detailed description of the structure and characteristics of the diffusion device 38 will be described in detail in the subsequent embodiments in conjunction with the drawings, and will not be repeated again. After passing through the diffusion device 38, the blue beam is reflected again in the opposite direction of the X direction to the dichroic plate 35. The incident angle of the blue beam incident on the dichroic plate 35 is 45 degrees. After being reflected by the dichroic plate 35, it reaches the light combining area in the opposite direction of the Y direction and combines with other beams.

[0081] The red laser 32 is arranged on one side of the blue laser 31 along the X direction. The light emitting direction of the red laser 32 is opposite to that of the blue laser 31. The red light beam emitted by the red laser 32 propagates in the opposite direction of the X direction, is incident on the diffusion device 8 and is transmitted from the diffusion device 8. The transmitted red light beam is incident on the dichroic plate 35 and is reflected by the dichroic plate 35, and is emitted in the opposite direction of the Y direction to reach the light combining area to be combined with other light beams.

[0082] The light combining area is located on the opposite side of the Y direction of the dichroic film 35. In the embodiment of the present application, there are yellow light beams, blue light beams and red light beams in the light combining area, and the three color light beams are combined in the light combining area.

[0083] Optionally, in one implementation, a diffusion plate 34 is arranged between the blue laser 31 and the dichroic film 35 along the X direction, and the surface of the diffusion plate 34 has irregular diffuse reflection patterns. After the blue laser beam passes through the diffusion plate 34, it is incident on the dichroic film 35. The diffusion plate 34 can disperse the laser beam and evenly scatter the light, thereby achieving a uniform light and uniform brightness luminous effect. The diffusion plate 34 can increase the diversity of the incident angle of the light beam, making the energy distribution of the light beam more uniform, improving the consistency of the overall color display, and eliminating the coarse speckle that may appear in the display screen, so as to improve the brightness of the light source and the light output quality.

[0084] Optionally, in one implementation, another diffuser plate 34 is arranged along the X direction between the diffuser 38 and the red laser 32. The function and beneficial effect of the diffuser plate 34 are the same as those of the diffuser plate 34 between the blue laser 31 and the dichroic film 35, which is to homogenize the red laser beam to eliminate coarse speckle, which will not be repeated here.

[0085] Optionally, in one implementation, at least one lens group 36 is arranged along the X direction between the dichroic plate 35 and the diffusion device 38, and the lens group 36 is used to converge the light beam. The lens group 36 here is used to converge the blue light beam transmitted from the dichroic plate 35, so that the converged blue light beam passes through the diffusion device 38, and the blue light beam is diffused again and reflected back to the lens group 36. The lens group 36 converges the blue light beam after diffusion and homogenization again, and then enters the dichroic plate 35 and combines the light by reflection. The lens group 36 here is also used to converge the red light beam transmitted from the diffusion device 38 and after diffusion and homogenization, and then enters the dichroic plate 35 and combines the light by reflection.

[0086] Optionally, in one implementation, at least one lens group 36 is arranged between the diffusion device 38 and the diffusion plate 34 along the X direction. Along the X direction, the diffusion device 38, the lens group 36, the diffusion plate 34, and the red laser 32 are arranged in sequence. The lens group 36 here is used to converge the red light beam after being diffused and homogenized by the diffusion plate 34, and the converged red light beam is incident on the diffusion device 38 for further diffusion.

[0087] Optionally, in one implementation, at least one lens group 36 is arranged along the Y direction between the dichroic plate 35 and the wavelength conversion device 37. The lens group 36 here is used to converge the blue light beam reflected from the dichroic plate 35, so that the converged blue light beam enters the incident area of ​​the wavelength conversion device 37. The lens group 36 here is also used to converge the yellow light beam emitted by the wavelength conversion device 37 after wavelength conversion, and the converged yellow light beam is transmitted from the dichroic plate 35 to reach the light combining area.

[0088] It should be understood that the number of lens groups 36 can be increased or decreased according to the optical path and the properties of the light beam during actual implementation, and this application does not impose any special limitation on this.

[0089] It should be understood that the lens group 36 includes at least one convex lens, and the lens group 36 may also include a lens group with a converging effect formed by other lenses. The actual composition of the lens group 36 and the type of lens, etc., can be adjusted during the actual implementation process according to the optical path and the properties of the light beam, and the present application does not make any special limitations on this.

[0090] Optionally, in one implementation, a quarter wave plate 33 is arranged along the X direction between the blue laser 31 and the diffuser 34 on the light-emitting side of the laser. The quarter wave plate 33 here is used to convert the linearly polarized light emitted by the blue laser 31 into circularly polarized light. In the field of laser display, it is usually necessary to accurately combine circularly polarized light and color light to achieve higher color saturation and contrast. The rotational symmetry and the property of circularly polarized light not being affected by optical path difference make it advantageous in this regard, especially in LCD backlight sources. The specific scope of protection shall be based on the scope of protection of the claims, and this application does not make any special limitation on this.

[0091] Optionally, in one implementation, a quarter wave plate 33 is also provided between the red laser 32 and the diffuser 34 on the light-emitting side of the laser. Along the X direction, the diffuser 34, the quarter wave plate 33, and the red laser 32 are arranged in sequence. The quarter wave plate 33 here is used to convert the linearly polarized light emitted by the red laser 32 into circularly polarized light. The beneficial effects brought about refer to the quarter wave plate 33 on the light-emitting side of the above-mentioned blue laser 31. The functions of the two wave plates are similar, and this application will not be repeated here. The specific scope of protection shall be subject to the scope of protection of the claims, and this application does not make any special limitations on this.

[0092] Optionally, in one implementation, the diffusion device includes a driving device and a diffusion sheet, and the diffusion sheet performs periodic motion under the action of the driving device. The diffusion sheet has a diffuse reflection surface and a dichroic surface. The diffuse reflection surface is used to diffuse the incident light beam, disperse the laser beam and evenly scatter the light, so as to achieve a uniform light and uniform brightness luminous effect. The diffuse reflection surface of the diffusion sheet can increase the diversity of the incident angle of the light beam, make the energy distribution of the light beam more uniform, improve the consistency of the overall color display, and eliminate the coarse speckle that may appear in the display screen. To improve the brightness of the light source and the light output quality. The dichroic surface of the diffusion sheet is selective and can reflect a light beam of one wavelength and transmit a light beam of another wavelength. Under the action of the driving device, the diffusion sheet performs periodic motion, which can further increase the randomness of the angle of the light beam incident on the diffusion sheet and further increase the diversity of the angle of the light beam incident on the diffusion sheet, and further make the energy distribution of the light beam more uniform. The beneficial technical effects produced by the uniform energy distribution of the light beam can be referred to the above description of this application, and will not be repeated here.

[0093] like Figure 4 , which is a schematic diagram of the structure of a diffuser 380 of a diffuser device in a laser light source provided in an embodiment of the present application. The illustrated direction is a side view of the diffuser 380, which can also be understood as a left view of the diffuser 380. The diffuser 380 includes partitions with different functions, wherein the front and back sides are different functional surfaces.

[0094] The diffuser 380 includes a diffuse reflection surface 381 and a dichroic surface 382. The diffuse reflection surface 381 is used to homogenize the light passing through, increase the diversity of the light angle, make the energy distribution of the light beam more uniform, improve the display consistency of the overall color, and reduce the coarse speckle in the picture. The function and beneficial effect are similar to those of the diffuser 34, which can be referred to in combination with Figure 3 The relevant description of the diffuser plate 34 is not repeated here in this application. The dichroic surface 382 can transmit a light beam of one wavelength and reflect a light beam of another wavelength. In the embodiment provided in the present application, a blue light beam propagating along the X direction is incident on the diffuser 38 from the side of the diffuse reflection surface 381. After the blue light beam is homogenized by the diffuser surface 381, it is reflected by the dichroic surface 382; a red light beam propagating in the opposite direction of the X direction is incident on the diffuser 38 from the side of the dichroic surface 382. The dichroic surface 382 transmits the red light beam. After being homogenized by the diffuse reflection surface 381, the red light beam is emitted. Figure 3 It can be seen that the red light beam and the blue light beam emitted by the diffuser 38 are propagated in the opposite direction of the X direction. After being converged by the lens group 36, the light beams of the two wavelengths enter the dichroic plate 35 at an angle of 45 degrees. After being reflected by the dichroic plate 35, the red light beam and the blue light beam reach the light combining area.

[0095] The embodiments of the present application provide two modes of movement of the diffusion device, that is, the embodiments of the present application provide two driving devices. The scope of protection shall be based on the claims, and the present application does not make any special limitation on this.

[0096] like Figure 5 As shown, in a laser light source provided in an embodiment of the present application, a rotating diffusion device 38 performs a rotating motion. The rotating diffusion device 38 includes a motor 383 and a diffusion sheet 380. The diffusion sheet 380 is coaxial with the mechanical rotation axis of the motor 383. Under the action of the motor 383, the diffusion sheet 380 performs a rotating motion around the mechanical rotation axis, and the mechanical rotation axis is parallel to the X direction.

[0097] It should be understood that the mechanical axis of the motor 383 is parallel to the X direction, including that the mechanical axis of the motor 383 is parallel to the optical axis of the blue light beam emitted by the blue laser 31, and that the mechanical axis of the motor 383 is coaxial with the optical axis. In the embodiment provided in the present application, the mechanical axis is only parallel to the optical axis, but not coaxial. The specific protection scope shall be subject to the claims, and the present application does not make any special limitation on this.

[0098] It should be understood that the mechanical shaft of the motor 383 rotates around the X direction, including the mechanical shaft rotating clockwise around the X direction, and also includes the mechanical shaft rotating counterclockwise around the X direction. The specific protection scope shall be subject to the claims, and this application does not make any special limitation on this.

[0099] like Figure 6 As shown, the translation diffusion device 48 in another laser light source provided in the embodiment of the present application performs translational motion. The diffusion device 48 includes an electromagnetic device 484 and a diffusion sheet 380. Wherein, under the action of the electromagnetic device 484, the diffusion sheet 380 performs periodic translational motion parallel to the Y direction and / or the Z direction in the same plane, that is, under the action of the electromagnetic device 484, the diffusion sheet 380 performs periodic translational motion up and down and left and right in the same plane.

[0100] It should be understood that the electromagnetic device 484 may include various electromagnetic devices such as electromagnetic coils, which are used to control the diffusion sheet 380 to perform periodic translational motion, and the present application does not make any special limitation on this.

[0101] It should be understood that Figure 5 The circular diffuser 380 and Figure 6 The square diffuser 380 is only exemplary, and the actual shape and size of the diffuser 380 is based on the optical path of the laser actually used, and this application does not make any special limitation on this.

[0102] It should be understood that the diffuser 380 translates in the plane where it is located, and the plane where the diffuser 380 is located is perpendicular to the optical axis of the blue light beam emitted by the blue laser 31. It can also be understood that the plane where the diffuser 380 is located is perpendicular to the X direction.

[0103] It should be understood that the diffuser 380 performs periodic translational motion in the plane under the action of the electromagnetic device 484, and the position of the electromagnetic device 484 is related to the movement direction of the diffuser 380. In one implementation, the electromagnetic device 484 is only arranged on one side of the Y-axis of the diffuser 380, and the diffuser performs periodic translational motion parallel to the Y direction under the action of the electromagnetic device 484, which can also be understood as the diffuser performs periodic up and down translational motion in the plane in which it is located. In one implementation, the electromagnetic device 484 is only arranged on one side of the Z-axis of the diffuser 380, and the diffuser performs periodic translational motion parallel to the Z direction under the action of the electromagnetic device 484, which can also be understood as the diffuser performs periodic left and right translational motion in the plane in which it is located. In one implementation, the electromagnetic device 484 is simultaneously arranged on one side of the Y-direction axis and the Z-direction axis of the diffuser 380. Then, under the action of the electromagnetic device 484, the diffuser performs periodic translational motion parallel to the Y-direction and the Z-direction respectively. It can also be understood that the diffuser performs periodic translational motion up, down, left, and right within the plane in which it is located. This application does not make any special limitation on this.

[0104] It should be understood that the location of the electromagnetic device 484 is related to the movement trajectory of the diffusion sheet 380 , and the present application does not specifically limit the location of the electromagnetic device 484 .

[0105] Optionally, in one implementation, a beam expander is also provided between the red laser 32 and the quarter wave plate 33 on the light-emitting side of the laser. Along the X direction, the quarter wave plate 33, the beam expander, and the red laser 32 are arranged in sequence, and the beam expander here is used to expand the incident laser beam. Due to the characteristics of the red laser, the number of particles of the light beam emitted by the red laser is relatively small. The beam expander expands the light from the laser from the initial spot and increases its lateral size. The beam expander can improve the stability of the laser beam, eliminate radial chromatic aberration, and make the light emitted by the laser have the same focal length throughout the focal length, thereby improving the beam quality and imaging clarity.

[0106] like Figure 3 As shown, the beam expansion device includes a beam expansion prism 39, and the beam expansion of the red laser beam is achieved through the beam expansion prism 39. The scope of protection shall be based on the claims, and this application does not make any special limitation on this.

[0107] like Figure 7 As shown, a schematic diagram of the optical path structure of another laser light source provided in an embodiment of the present application, the beam expansion device may further include a beam expansion lens group 49, the scope of protection shall be based on the claims, and the present application does not make any special limitation on this.

[0108] It should be understood that Figure 7In the embodiment shown, a translation diffusion device 48 is included, and the area, shape and size of the translation diffusion device 48 should ensure that the diffusion sheet 380 can cover the incident positions of the blue laser beam and the red laser beam under all movement trajectories. The specific protection scope shall be subject to the claims, and this application does not make any special limitation on this.

[0109] It should be understood that Figure 7 The illustrated embodiment includes a translational diffusion device 48 and a beam expanding lens group 49, wherein the translational diffusion device 48, the rotational diffusion device 38 and the beam expanding prism 39, and the beam expanding lens group 49 can be combined in pairs to form a new embodiment, which will not be described in detail in this application.

[0110] like Figure 8 As shown, it includes a schematic diagram of the optical path structure of a laser light source provided in an embodiment of the present application ( Figure 8 (a)), and also includes a schematic diagram of the optical path structure of a commonly used two-color laser light source provided in an embodiment of the present application ( Figure 8 (b)). Figure 8 (b) For those skilled in the art, based on an embodiment provided by this application Figure 8 (a) The optical devices used are shown in the schematic diagram of the optical path structure of the commonly used two-color laser light source ( Figure 1 ) is used to build a light path diagram to realize the light source function. The actual light path structure size is as follows Figure 8 shown.

[0111] exist Figure 8 In (b), the two-color laser light source has a red laser 41 and a blue laser 42. The red laser beam emitted by the red laser 41 passes through the beam expansion prism 43 and is incident on the 1 / 4 wave plate 43 and the diffusion plate 45. After being emitted, it is incident on the dichroic plate 46. The dichroic plate 46 transmits the red light beam and reflects the blue light beam. The red light beam transmits the dichroic plate 46, passes through the converging lens group 48, and is incident on the reflector 410. The reflector 410 reflects the red light beam. The reflected red light beam passes through the diffusion wheel 49 and the converging lens group 48, and is incident on the dichroic plate 46. The red light beam is transmitted from the dichroic plate 46 and reaches the light combining area.

[0112] The blue laser beam emitted by the blue laser 42 is split into two after passing through the beam splitter 47, one blue beam is transmitted through the beam splitter 47, and the other blue beam is reflected by the beam splitter 47. The blue beam transmitted from the beam splitter 47 is converged by the convergent lens group 48 and then incident on the dichroic plate 46. After being transmitted from the dichroic plate 46 and converged by the convergent lens group 48, it is incident on the fluorescence conversion device 411. The blue laser beam excites the fluorescence conversion device 411 to generate a yellow beam. The generated yellow beam is converged by the convergent lens group and then reaches the dichroic plate 46. After being reflected by the dichroic plate 46, it reaches the light combining area. The blue light beam reflected by the beam splitter 47 passes through the 1 / 4 wave plate 44 and the diffuser 45 and is incident on the dichroic plate 46. After being reflected by the dichroic plate 46, it coincides with the light path of the red light beam. After being converged by the converging lens group 48, it is incident on the reflector 410. The reflector 410 reflects the blue light beam. The reflected blue light beam passes through the diffuser wheel 49 and the converging lens group 48 and is incident on the dichroic plate 46. The blue light beam is transmitted from the dichroic plate 46 and reaches the light combining area.

[0113] Those skilled in the art can build a light path and reproduce the light source function according to the light path schematic diagram of an embodiment provided in this application. Figure 8 (a) with Figure 8 The lateral dimensions of the laser light sources shown in (b) are all 144 mm. Figure 8 The laser light source shown in (b) uses a commonly used dichroic film and diffuser, and the overall longitudinal dimension of the optical path is 132 mm. Figure 8 The laser light source shown in (a) adopts the diffusion device provided in the embodiment of the present application, which has the characteristics of both a dichroic film and a diffusion plate, optimizes the size of the commonly used laser light path, and the longitudinal dimension of the laser light source light path is 92 mm. Figure 8 (b) with Figure 8 (a) In comparison, the laser light source provided in the embodiment of the present application reduces the volume of the laser circuit by nearly 1 / 4 compared to the commonly used two-color laser light source, and omits the number of optical elements such as some lens groups, thereby reducing the volume of the light source and effectively controlling the cost of the light source.

[0114] It should be understood that Figure 8 The volume size of the light source shown in is only one of the ways for professionals in this field to reproduce the embodiments of the present application. The specific protection scope shall be based on the claims, and the present application does not make any special limitation on this.

[0115] Fig. 9 500 is a schematic diagram of the structure of a laser display device provided in an embodiment of the present application. The laser display device 500 includes a laser light source 501, a light valve assembly 502 and a projection lens 503. The laser light source 501 includes the above Figures 3 to 7In the laser light source of any one of the implementation modes, the light valve assembly 502 is arranged on the light output side of the laser light source 501, and is used to modulate the three-color laser output by the laser light source 501 and emit it to the projection lens 503; the projection lens 503 is used to project the incident three-color laser.

[0116] It should be noted that Figures 1 to 9 The diagram is merely a schematic illustration to facilitate understanding of the embodiments of the present application and does not constitute a particular limitation on the present application.

[0117] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A laser light source, characterized in that: include: A first laser, a second laser, a wavelength conversion device, a spectrometer, and a diffusion device, wherein: The first laser, the light splitting device, the diffusion device and the second laser are arranged in sequence along a first direction, the first direction being a propagation direction of a first laser beam with a first wavelength emitted by the first laser, and the second laser is arranged opposite to the first laser; The light splitting device and the wavelength conversion device are arranged in sequence along a second direction, and the second direction is perpendicular to the first direction; The first laser beam is incident on the beam splitter along the first direction, and the beam splitter is used to split the incident first laser beam into a first beam by reflection and into a second beam by transmission; The first light beam is incident on the wavelength conversion device along the second direction, the wavelength conversion device generates a third laser beam with a third wavelength based on the light beam of the first wavelength, the third laser beam is incident on the light splitting device, is transmitted by the light splitting device, and reaches the light combining area; The second light beam is incident on the diffusion device along the first direction, and the diffusion device is used to homogenize the incident light beam, and the diffusion device reflects the light beam of the first wavelength and transmits the light beam of the second wavelength. The second light beam is reflected by the diffusion device to the light splitting device, and is reflected again by the light splitting device to reach the light combining area; The second laser is used to emit a second laser beam with a second wavelength. The second laser beam is incident on the diffusion device, transmitted by the diffusion device and incident on the light splitting device, reflected by the light splitting device, and reaches the light combining area.

2. The laser light source according to claim 1, characterized in that: The diffusion device comprises a diffusion sheet, wherein: The first surface of the diffuser is the diffuse reflection surface, the second surface is the dichroic surface, and the first surface is not adjacent to the second surface. The diffusion sheet performs periodic motion.

3. The laser light source according to claim 2, characterized in that: The diffusion device also includes a driving device, The driving device is used to drive the diffusion sheet to rotate. The diffusion sheet is coaxial with a mechanical shaft of the driving device, and the mechanical shaft is parallel to the first direction.

4. The laser light source according to claim 2, characterized in that: The diffusion device also includes a driving device, The driving device is used to drive the diffusion sheet to perform translational motion. The diffusion sheet performs periodic translational motion parallel to the second direction and / or the third direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other.

5. The laser light source according to any one of claims 1 to 4, characterized in that: The laser light source further includes a first lens group, The first lens group is arranged along the first direction on the optical path between the light splitting device and the diffusion device. The first lens group is used to converge the incident second light beam and the second laser beam.

6. The laser light source according to any one of claims 1 to 5, characterized in that: The laser light source further includes a second lens group, The second lens group is arranged along the first direction on the optical path between the diffusion device and the second laser. The second lens group is used to converge the incident second laser beam.

7. The laser light source according to any one of claims 1 to 6, characterized in that: The laser light source further includes a third lens group, The third lens group is arranged along the second direction on the optical path between the light splitting device and the wavelength conversion device. The third lens group is used to converge the incident first light beam and the third laser beam.

8. The laser light source according to any one of claims 1 to 7, characterized in that: The laser light source also includes a beam expansion device, The beam expansion device is arranged on the light output side of the second laser, The beam expander is used to expand the divergence angle of the incident second laser beam.

9. The laser light source according to any one of claims 1 to 8, characterized in that: The laser light source also includes a first 1 / 4 wave plate, The first quarter wave plate is arranged on the light output side of the first laser. The first quarter wave plate is used to convert the incident first laser beam from linearly polarized light to circularly polarized light.

10. The laser light source according to claim 8 or 9, characterized in that: The laser light source also includes a second quarter wave plate, The second 1 / 4 wave plate is arranged on the optical path of the second laser beam, and the second 1 / 4 wave plate, the beam expander, and the second laser are arranged in sequence along the first direction. The second quarter wave plate is used to convert the incident second laser beam from linearly polarized light to circularly polarized light.

11. The laser light source according to claim 9 or 10, characterized in that: The laser light source further includes a first diffusion plate, The first diffuser is arranged along the first direction on the optical path between the first quarter wave plate and the light splitting device. The first diffusion plate is used to diffusely reflect and diffuse the incident first laser beam, thereby homogenizing the first laser beam.

12. The laser light source according to claim 10 or 11, characterized in that: The laser light source further includes a second diffusion plate, The second diffuser is arranged on the optical path of the second laser beam, and the second diffuser, the second quarter wave plate, the beam expander, and the second laser are arranged in sequence along the first direction. The second diffusion plate is used to diffusely reflect and diffuse the incident second laser beam, and to homogenize the second laser beam.

13. A laser display device, characterized in that: include: The laser light source, light valve assembly and projection lens according to any one of claims 1 to 12, The light valve assembly is arranged on the light output side of the laser light source, and is used to modulate the three-color laser light output by the laser light source and then emit it to the projection lens; The projection lens is used to project the incident three-color laser light.

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