Laser light source device and projection equipment

Abstract

A laser light source device (1) and a projection device belong to the field of laser display. The laser light source device (1) comprises: a laser array (11), a light transmission component (12) and a compound eye lens (13), wherein the compound eye lens (13) comprises a plurality of rectangular lenses (131) arranged in an array, wherein the fast axis direction (f1) of the laser (111) is parallel to the short side (b) of the rectangular lens (131) in the compound eye lens (13), and the slow axis direction (f2) of the laser (111) is parallel to the short side (b) of the rectangular lens (131) in the compound eye lens (13). 31), and the sine value (sinα1) of the divergence angle (α1) of the fast axis of the laser (111) is greater than the sine value (sinβ1) of the aperture angle (β1) of the long side (a) of the rectangular lens (131), and the sine value (sinα2) of the divergence angle (α2) of the slow axis of the laser (111) is greater than the sine value (sinβ2) of the aperture angle (β2) of the short side (b) of the rectangular lens (131).

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2020, with application number 202011597569.2, and invention name “Laser light source device and projection equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of laser display, and in particular to a laser light source device and a projection device. Background Art

[0004] As people continue to pursue more colorful images, laser projection has developed, offering advantages such as large imaging screens, high spectral brightness, and a wide color gamut. Among them, three-color semiconductor lasers have begun to be used as laser light sources in laser projection technology. Summary of the Invention

[0005] In a first aspect, an embodiment of the present application provides a laser light source device, the device comprising a laser array, a light transmission component, and a fly-eye lens sequentially arranged along an optical path, the fly-eye lens comprising a plurality of rectangular lenses arranged in an array;

[0006] The laser array includes a plurality of lasers arranged in an array, wherein the fast axis direction of the laser is parallel to the short side of the rectangular lens in the fly-eye lens, the slow axis direction of the laser is parallel to the long side of the rectangular lens in the fly-eye lens, and the sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle of the slow axis of the laser is greater than the sine value of the aperture angle of the short side of the rectangular lens.

[0007] According to a second aspect of the embodiments of the present application, a projection device is provided. The projection device includes: the above-mentioned laser light source device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0009] Figure 1 This is a schematic structural diagram of a laser light source device provided in an embodiment of the present application;

[0010] Figure 2 yes Figure 1 A schematic structural diagram of a laser array of the laser light source device shown;

[0011] Figure 3 yes Figure 1 A schematic diagram of the structure of the fly-eye lens of the laser light source device shown;

[0012] Figure 4 is a light path diagram of a laser light source device provided in an embodiment of the present application;

[0013] Figure 5 yes Figure 1 A schematic structural diagram of a beam reduction system in the laser light source device shown;

[0014] Figure 6 yes Figure 1 A schematic structural diagram of a compound eye lens in the laser light source device shown;

[0015] Figure 7 It is a structural schematic diagram of a projection device shown in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0017] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as having an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to indicate that the specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0018] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0019] Figure 1 This is a schematic diagram of the structure of a laser light source device provided in an embodiment of the present application. Figure 1As shown, the laser light source device 1 includes a laser array 11, a light transmission component 12, and a fly-eye lens 13, which are arranged in sequence along the optical path. The fly-eye lens 13 comprises a plurality of rectangular lenses arranged in an array. The laser array 11 emits a light beam, and the light transmission component 12 is used to receive the light beam emitted by the laser array 11 and direct it to the fly-eye lens 13.

[0020] The laser array 11 includes a plurality of lasers arranged in an array, wherein the fast axis direction of the laser is parallel to the short side of the rectangular lens in the fly-eye lens 13, and the slow axis direction of the laser is parallel to the long side of the rectangular lens 13 in the fly-eye lens, and the sine value sinα1 of the divergence angle of the fast axis of the laser is greater than the sine value sinβ1 of the aperture angle β1 of the long side of the rectangular lens, that is, sinα1>sinβ1; the sine value sinα2 of the divergence angle α2 of the slow axis of the laser is greater than the sine value sinβ2 of the aperture angle β2 of the short side of the rectangular lens, that is, sinα2>sinβ2.

[0021] Among them, the direction of the light vector with slow propagation speed in the laser is called the slow axis of the laser, and the direction of the light vector with fast propagation speed in the laser is called the fast axis of the laser. Figure 2 yes Figure 1 The schematic diagram of the structure of the laser array of the laser light source device shown in FIG. Figure 2 As shown, the fast axis direction of the laser in the laser array of the laser light source device provided in the embodiment of the present application is f1, and the slow axis direction is f2.

[0022] In addition, the divergence angle of a laser is used to measure the speed at which the beam diverges from the beam waist (the beam waist is the position in the beam propagation direction where the beam radius is the smallest, and the beam radius at this position is called the beam waist radius). The divergence angle of a laser can be measured by measuring the beam defocus. That is, using a beam profiler to measure the beam radius at different positions, thereby obtaining the laser's divergence angle.

[0023] Figure 3 yes Figure 1 The schematic diagram of the structure of the compound eye lens of the laser light source device is shown in FIG. Figure 3 As shown, the fly-eye lens 13 includes a plurality of rectangular lenses 131 arranged in an array.

[0024] The compound eye lens divides the light beam into N channels (the value of N is the number of rectangular lenses in the compound eye lens) through each rectangular lens. The light beam of each channel independently illuminates the entire object surface, that is, the illumination of the object surface is the superposition of the illumination of each channel, thereby greatly improving the uniformity of the illuminated object surface.

[0025] In the application of the fly-eye lens, two rows of fly-eye lens arrays are arranged in parallel, and the focal point of each rectangular lens in the first row of the fly-eye lens array coincides with the center of the corresponding rectangular lens in the second row of the fly-eye lens array. The optical axes of the two rows of fly-eye lenses are parallel to each other, so that the light spot of the input laser beam can be split, and then the split light spots are accumulated through subsequent focusing lenses, thereby achieving light beam homogenization and light spot optimization.

[0026] In addition, the compound eye lens used as a light homogenizing device is relatively small, which can correspondingly reduce the volume of the laser light source device and further reduce the volume of the projection device using the laser light source device, making the projection device as a whole lighter and more beautiful, and providing a better user experience.

[0027] In summary, an embodiment of the present application provides a laser light source device, which includes a laser array, a light transmission component, and a fly-eye lens. The laser array includes a plurality of lasers arranged in an array, and the fly-eye lens includes a plurality of rectangular lenses. The sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle of the slow axis is greater than the sine value of the aperture angle of the short side of the rectangular lens. In this way, the parameters of the laser are associated with the parameters of the fly-eye lens, which facilitates the realization of the light uniformity function through the fly-eye lens. Compared with the light guide, since the size of the fly-eye lens in the direction of the light path is smaller, the size of the laser light source device will also be smaller. This solves the problem of the excessive size of the laser light source device in the related art, and achieves the effect of reducing the volume of the laser light source device.

[0028] In a specific implementation, please refer to Figure 2 and Figure 3 The laser array 11 includes a plurality of lasers 111, and the fly-eye lens 13 includes a plurality of rectangular lenses 131 arranged in an array. The spot area of ​​the laser 111 is larger than the area of ​​the rectangular lens 131. Figure 3 As shown, the rectangular lenses 131 in the fly-eye lens 13 are evenly arranged, and each rectangular lens 131 has a long side a and a short side b. Therefore, the area S1 of the rectangular lens 131 is equal to a·b. At the same time, in the embodiment of the present application, the spot area S2 of the laser 111 is larger than the area S1 of the rectangular lens 131, that is, S2>S1. With this structure, the laser spot passes through the rectangular lenses in the multiple fly-eye lenses, so that the spot is divided as many times as possible to achieve the uniform light requirement of the laser beam.

[0029] In one specific implementation, the laser spot area S2 is greater than three times the area S1 of the rectangular lens, i.e., S2>3S1. With this structure, the laser spot can pass through at least multiple rectangular lenses, so that the laser core spot is divided into multiple parts by the rectangular lenses in the fly-eye lens. The divided spots are then superimposed by the subsequent focusing lens, thereby achieving beam homogenization.

[0030] In one specific implementation, the sine value sinα1 of the divergence angle of the laser's fast axis is greater than the sine value sinα2 of the divergence angle of the laser's slow axis. The fast axis divergence angle of the array laser output beam may range from 40 degrees to 90 degrees, and the slow axis divergence angle may be 10 degrees.

[0031] In addition, please refer to Figure 2 The laser array 11 includes lasers 111 for emitting three colors of laser light: a red laser 111a for emitting red laser light, a blue laser 111b for emitting blue laser light, and a green laser 111c for emitting green laser light. The red laser light emitted by the red laser 111a may have a wavelength of 638 to 650 nanometers. The blue laser 111b may have a wavelength in the range of 445 to 450 nanometers, and the green laser 111c may have a wavelength in the range of 532 to 556 nanometers. The wavelength of the laser light refers to the wavelength of the laser light output by the laser.

[0032] For example, Figure 2 As shown, the lasers 111 include two groups of red lasers 111a, one group of blue lasers 111b, and one group of green lasers 111c. In one embodiment, the lasers in the laser system are arranged in four rows of seven lasers, with the first row containing green lasers 111c, the second row containing blue lasers 111b, and the third and fourth rows containing red lasers 111a.

[0033] Meanwhile, the fast axis direction f1 of the laser 111 is parallel to the column direction of the laser 111 , and the slow axis direction f2 is parallel to the row direction of the laser 111 .

[0034] The red, blue, and green lasers emitted by red laser 111a, blue laser 111b, and green laser 111c are called the three primary colors of light, represented by R (Red), B (Blue), and G (Green), respectively. Various colors in nature can be created by combining the three primary colors by varying the frequency and intensity of these three primary colors. Furthermore, white light can be generated by mixing red, blue, and green lasers in equal proportions.

[0035] In a specific implementation, the sine value sinβ1 of the aperture angle β1 of the long side of the rectangular lens is greater than the sine value sinβ2 of the aperture angle β2 of the short side of the rectangular lens.

[0036] In a specific implementation, please refer to Figure 4 , Figure 4This is a light path diagram of a laser light source device provided in an embodiment of the present application. The light transmission assembly 12 includes a stepped mirror 121, which includes a reflector 1211 and a dichroic plate 1212. The reflector 1211 is located between the green laser 111c and the fly-eye lens 13. The reflector 1211 is used to deflect the light path and direct the green laser light emitted by the green laser 111c toward the dichroic plate 1212.

[0037] In the embodiment of the present application, the dichroic plate 1212 includes a first dichroic plate 1212a and a second dichroic plate 1212b. Figure 4 As shown, the first dichroic plate 1212 a is located between the blue laser 111 b and the fly-eye lens 13 , and the second dichroic plate 1212 b is located between the two groups of red lasers 111 a and the fly-eye lens 13 .

[0038] Among them, the dichroic filter, also known as the light combining filter, is a color filter that can be used to selectively transmit a certain color of light and reflect other colors of light. The dichroic filter has a high transmittance of the transmitted light (the transmittance is as high as 97%) and a high reflection efficiency of the reflected light (the reflection efficiency is greater than 99%). It also has the advantages of low absorption, less dispersion, less laser loss and no film surface distinction.

[0039] The first dichroic plate 1212a is used to reflect the blue laser light emitted by the blue laser 111b and transmit the green laser light emitted by the green laser 111c. The second dichroic plate 1212b is used to reflect the red laser light emitted by the red laser 111a and transmit the blue laser light and the green laser light emitted by the first dichroic plate 1212a.

[0040] In addition, if Figure 4 As shown, the blue laser light reflected by the first dichroic plate 1212a and the green laser light transmitted therefrom are co-directional, and this direction y is perpendicular to the emission direction x of the laser 111. Similarly, the red laser light reflected by the second dichroic plate 1212b and the green and blue laser light transmitted therefrom are co-directional, and this direction y is perpendicular to the emission direction x of the laser 111. This structure allows the red, blue, and green laser light emitted by the laser to be combined by the optical transmission assembly 12. At the same time, the optical transmission assembly 12 also deflects the laser light path, shortening the distance of the laser light path parallel to the emission direction of the laser 111. This allows the components of the laser light source device to be arranged more compactly, improving space utilization. This reduces the volume and weight of the laser light source device, thereby meeting the requirements for miniaturization of the laser light source device.

[0041] In a specific implementation, Figure 4 As shown, the reflector 1211 in the light transmission component 12 can be placed at a 45-degree angle. That is, the green laser light emitted by the green laser 111 c has an incident angle of 45 degrees when it enters the reflector 1211 .

[0042] In a specific implementation, the dichroic plate 1212 in the laser light source device shown in the embodiment of the present application can be a 45-degree dichroic plate, that is, the dichroic plate is placed at a 45-degree angle to the emission direction x of the laser 111.

[0043] In a specific implementation, please refer to Figure 1 The laser light source device 1 also includes a collimator 14, which is located between the laser array 11 and the light transmission component 12. The laser array 11 emits three-color light beams, which are incident on the collimator 14. The collimator 14 is used to collimate the laser beams in the optical path and form parallel output lasers. Due to the characteristics of the laser itself, the laser beams emitted by the laser array 11 may have uneven intensity distribution, such as bright spots or stripes of various shapes. The parallel output effect of the collimator 14 can form parallel laser beams, and then the light transmission component 12 performs the turning of the optical path and the combination of the three-color lasers. Such a structure reduces the spatial coherence of the laser beam and suppresses laser speckle.

[0044] In one embodiment, the laser light source device 1 further includes a diffusion component 15, which is located between the light transmission component 12 and the fly-eye lens 13. The diffusion component 15 includes a diffusion wheel or a diffusion plate. Because the light source is a pure three-color laser light source, the laser will exhibit speckle (speckle refers to the granular structure of the surface of an object illuminated by the laser). Laser light has high coherence. Therefore, when the laser light is reflected from the surface of an object, the vibrations from each point on the object to the observation point are coherent. The light field at the observation point is the superposition of coherent sub-waves emitted by each point on the rough surface. Because the roughness of the rough surface is greater than the laser wavelength, the phases of the sub-lasers emitted by each point on the object are randomly distributed when they arrive at the observation point. This coherent superposition produces a speckle pattern, and the intensity of the speckle pattern is randomly distributed. In this embodiment of the present application, the diffusion component 15 can be a diffusion wheel or a diffusion plate, which is used to homogenize the three-color laser light to reduce the uneven distribution of laser spot energy.

[0045] When the diffuser is working, it rotates along its axis at a certain frequency. The rotating diffuser can generate some random phases in the space of the laser beam, thus interfering with the coherence of the laser and reducing the uneven distribution of the laser spot.

[0046] In one embodiment, the laser light source device 1 further includes a beam reduction system 16, which is located between the light transmission system 12 and the fly-eye lens 13. If the spot size of the laser light emitted by the laser 111 is too large, the laser light emitted by the laser 111 can be beam reduced to improve diffusion efficiency. Figure 5 yes Figure 1 The schematic diagram of the structure of a beam reduction system in a laser light source device is shown as follows: Figure 5 As shown, the beam reduction system 16 includes a lens group structure 161, which includes a concave lens 1611 and a convex lens 1612. The optical axis of the concave lens 1611 coincides with the optical axis of the convex lens 1612. The convex lens 1612 is used to receive an incident light beam whose incident direction is parallel to the optical axis of the convex lens 1612, converge the incident light beam, and reflect it to the concave lens 1611; the concave lens 1611 diverges the received light beam and emits the light beam in a direction parallel to the concave lens 1611. With such a structure, the convex lens converges the light beam with a larger diameter and emits it to the concave lens, and the concave lens diverges the light beam to form an output light beam with a smaller diameter, thereby achieving a beam reduction effect.

[0047] In a specific implementation, the laser light source device 1 further includes a diffusion component 15 and a beam reduction system 16. In one implementation, the laser light source device may include both the diffusion component 15 and the beam reduction system 16, wherein the beam reduction system 16 is located between the diffusion component 15 and the light transmission component 12.

[0048] In a specific implementation, please refer to Figure 4 The laser light source device 1 also includes a half-wave plate 17. This plate is located between the two groups of red lasers 111a and the second dichroic plate 1212b, with the plane of the plate perpendicular to the direction of the output beams from the red lasers 111a. The half-wave plate changes the polarization direction of the laser light, thereby improving the consistency of the three-color laser light processing by the projection optical system and the projection screen, further resolving color cast issues such as "spots" or "blocks" in the three-color laser projection image.

[0049] Figure 6 yes Figure 1 A schematic diagram of the structure of a compound eye lens in a laser light source device is shown in FIG. Figure 4 and Figure 6 As shown, the fly-eye lens 13 includes a first fly-eye lens 131 and a second fly-eye lens 132 arranged in parallel. The first fly-eye lens 131 is used to receive the light beam emitted by the light transmission component 12, and the second fly-eye lens 132 is used to emit the homogenized light beam. The number of rectangular lenses on the first fly-eye lens 131 and the second fly-eye lens 132 is equal and corresponds to each other.

[0050] like Figure 6As shown, after entering the first fly-eye lens 131 perpendicularly along the y-direction, the light beam forms a beam of parallel light parallel to the optical axis. After passing through the first fly-eye lens 131, the light beam is focused onto the center of the second fly-eye lens 132. In other words, the first fly-eye lens 131 forms multiple light source images for illumination. Each rectangular lens of the second fly-eye lens 132 overlaps the corresponding rectangular lens on the first fly-eye lens 131 to form an image. The light spot emitted by the second fly-eye lens 132 is then focused onto the display screen by a subsequent condenser lens. With this structure, the first row of fly-eye lenses 131 divides the entire wide light beam from the light source into multiple fine beams. Due to the overlapping of the symmetrically positioned fine beams, slight non-uniformities within each fine beam are compensated, thereby effectively and evenly utilizing the light energy within the entire aperture and achieving beam homogenization.

[0051] In one embodiment, the first fly-eye lens can be integrally formed with the second fly-eye lens using a substrate. The substrate can be made of glass or other light-transmitting materials. The first fly-eye lens is located on one side of the substrate, while the second fly-eye lens is located on the other side. This structure not only facilitates installation but also saves space occupied by the fly-eye lens, further reducing the size of the laser light source device and making it more aesthetically pleasing.

[0052] In summary, an embodiment of the present application provides a laser light source device, which includes a laser array, a light transmission component, and a fly-eye lens. The laser array includes a plurality of lasers arranged in an array, and the fly-eye lens includes a plurality of rectangular lenses. The sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle of the slow axis is greater than the sine value of the aperture angle of the short side of the rectangular lens. In this way, the parameters of the laser are associated with the parameters of the fly-eye lens, which facilitates the realization of the light uniformity function through the fly-eye lens. Compared with the light guide, since the size of the fly-eye lens in the direction of the light path is smaller, the size of the laser light source device will also be smaller. This solves the problem of the excessive size of the laser light source device in the related art, and achieves the effect of reducing the volume of the laser light source device.

[0053] In addition, the present invention also provides a projection device, please refer to Figure 7 , Figure 7 It is a structural schematic diagram of a projection device shown in an embodiment of the present application, which includes a reflector 2, a light valve 3, a total reflection prism 4, a galvanometer 5, a lens assembly 6, a screen 7 and the laser light source device 1 provided in the above embodiment.

[0054] Among them, the laser light source device 1, the reflector 2, the light valve 3, the total reflection prism 4, the galvanometer 5, and the lens assembly 6 are arranged in sequence along the optical path. The laser light source device 1 is used to provide an illumination beam, the reflector 2 is used to deflect the beam provided by the laser light source device 1, the total reflection prism 4 is used to receive the light beam guided by the reflector 2 and guide it to the light valve 3, the light valve 3 is used to receive the light beam and modulate it to form an image beam, and then cooperate with the galvanometer 5 and the total reflection prism 4 to guide the light beam to the lens assembly 6. The lens assembly 6 is used to receive the image beam, correct and amplify the image beam, and then project it onto the screen 7. The galvanometer 5 is located between the total reflection prism 4 and the lens assembly 6. The total reflection prism 4 is used to direct the image beam modulated by the light valve 3 toward the galvanometer 5. The galvanometer 5 vibrates at a preset frequency, so that the light beams passing through the galvanometer 5 are dislocated and superimposed and enter the lens assembly 6.

[0055] A light valve (DMD) is a digital micromirror device that digitally modulates light. It comprises an array of high-speed digital light-reflecting micromirrors that correspond to the light rays in the projected image. When these micromirrors work in conjunction with the digital signal, light source, and projection lens, they can faithfully reproduce the image.

[0056] The microelectrodes under each micromirror are activated by digital signals, which push the mirror surface of the micromirror toward or away from the light source. When the mirror surface of the micromirror faces the light source (that is, the micromirror is in the on state), a white pixel is reflected through the lens assembly to the screen in the projection device. When the mirror surface of the micromirror avoids the light source (that is, the micromirror is in the off state), the position of the micromirror pixel on the screen appears dark. Therefore, the multiple small reflectors in the light valve correspond to one pixel one by one, and the number of reflectors determines the display resolution of the light valve. For example, for a 4K resolution light valve, the micromirror array can be arranged in 4096*2160.

[0057] The micromirrors can open and close at a speed of 5,000 times per second (meaning the micromirrors in the light valve can rotate thousands of times per second). Therefore, by interchanging the opening and closing times of each micromirror, different levels of grayscale can be produced. For example, if the micromirror is on for longer than it is off, the resulting grayscale pixel will be lighter; if the micromirror is off for longer than it is on, the resulting grayscale pixel will be darker.

[0058] Furthermore, during the operation of the light valve, the micromirrors reflect light by rotating, and the rotation of each micromirror is controlled by a microelectrode located beneath each micromirror. At the same time, each micromirror reflects only one color during one rotation. For example, the micromirror that projects purple pixels is only responsible for projecting red and blue light onto the screen (red light combined with blue light creates purple light), while the micromirror that projects orange pixels is only responsible for reflecting red and green light proportionally onto the screen (red light accounts for a higher proportion and green light accounts for a lower proportion). Because the micromirrors open and close quickly, light is projected onto the screen through the lens assembly. The human visual system mixes the rapidly flashing three colors of light, and because of the persistence of vision, a clear image can be seen on the screen.

[0059] The light valve 2 may have a resolution of 2K, or a resolution of 3K or higher, which is not limited in this embodiment of the present application.

[0060] The total internal reflection (TIR) ​​prism 4 is located between the galvanometer 5 and the light valve 3. The TIR prism 4 is used to convert the light beam emitted by the light valve 2 into a parallel beam to improve the smoothness of the final image on the screen 7. Figure 7 As shown, the laser in the laser light source device 1 emits a light beam, which is then redirected by the reflector 2. The redirected light beam enters the total reflection prism 4, which can guide the light beam to the light valve 3. After receiving the light beam, the light valve 3 modulates it and forms an image beam. This part of the light beam enters the total reflection prism 4 again, and then forms parallel light through the total reflection prism 4. The parallel light is incident on the galvanometer 5, and then emitted through the galvanometer 5 to the lens assembly 6, and then imaged on the screen 7.

[0061] Among them, the reflector 2 is used to bend the path of the laser beam emitted by the laser light source device 1. In a specific implementation, the reflector 2 can be placed at 45 degrees to the direction of laser emission. Such a structure allows the optical path of the laser emitted by the laser light source device 1 to be turned 90 degrees, which can shorten the length of the optical path in the direction of laser emission and further reduce the volume of the projection device.

[0062] The total reflection prism 6 may be a prism with a right-angled triangle cross section, or may be a prism with a right-angled triangle cross section glued together with a compensation prism, which is not limited in this embodiment of the present application.

[0063] At the same time, when the total reflection prism is used for lighting, the total reflection function is realized in the lighting light path, which can fully reflect the light incident on the prism to the light valve; when the total reflection prism is used in the ultra-short focus lens system, the total reflection prism can be used as flat glass to effectively control the impact of dust on the imaging quality of the system.

[0064] In addition, the galvanometer 3 may include an optical lens and a driving component, and the driving component drives the optical lens to continuously swing along a preset rotation axis, and the optical lens can change the direction of the light beam accordingly, wherein the optical lens may be a flat glass or a reflector.

[0065] For example, when the incident light beam on the galvanometer is parallel (i.e., each ray in the beam has the same angle of incidence), after the optical lens in the galvanometer swings from one position to another, the displacement distance of each pixel of the projected image corresponding to the image beam is equal, so that the offset between each field of view in the projection lens and the projection screen is consistent, thus ensuring high-resolution display of the visual image. The field of view offset refers to the actual displacement distance of the field of view, so the light beam emitted from the galvanometer is parallel, and the high-frequency vibration of the galvanometer can achieve 2k or 3k resolution conversion to 4k resolution. This structure can reduce the difficulty of system design.

[0066] With the use of galvanometers, a 2K resolution light valve can be used in conjunction with the galvanometer to achieve 4K resolution. A 4K resolution light valve can also be used in conjunction with the galvanometer to achieve 8K resolution, improving resolution while maintaining overall size.

[0067] In a specific implementation, the flatness of the galvanometer is less than 3 stripes, and the irregularity is less than 1 / 2 stripe. Flatness refers to the deviation of the macroscopic concave and convex height of the substrate from the ideal plane. The actual surface to be measured is compared with the ideal plane, and the line value distance between the two is the flatness error value; or by measuring the relative height difference of several points on the actual surface, the flatness error value expressed in line value is converted. The method for measuring the flatness error can refer to the relevant technology, and the embodiments of the present application are not limited here. The flatness of the reflector used in the present application is less than 3 stripes, and the irregularity is less than 1 / 2 stripe. The specific flatness of the embodiments of the present application is not limited here.

[0068] In summary, an embodiment of the present application provides a projection device, which includes a light valve, a galvanometer, a lens assembly, a screen, and the laser light source device provided in Example 1. The laser light source device includes a laser array, a light transmission assembly, and a fly-eye lens. The sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle of the slow axis is greater than the sine value of the aperture angle of the short side of the rectangular lens. In this way, the parameters of the laser are associated with the parameters of the fly-eye lens, which facilitates the realization of the light uniformity function through the fly-eye lens. Compared with the light guide, since the size of the fly-eye lens in the direction of the light path is smaller, the size of the laser light source device will also be smaller, which further reduces the volume of the projection device, making the appearance light, thin and beautiful. The problem of the excessive volume of the laser light source device in the related art is solved, and the effect of reducing the volume of the laser light source device is achieved.

[0069] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A laser light source device, comprising: A laser array is sequentially arranged along the optical path and configured to emit a laser beam; a light transmission component, disposed on the light-emitting side of the plurality of lasers and configured to combine the laser beams; a fly-eye lens, disposed on the light-emitting side of the light-transmitting component, and configured to homogenize the laser beam; the fly-eye lens comprises a plurality of rectangular lenses arranged in an array; Wherein, the laser array comprises a plurality of lasers arranged in an array; The fast axis direction of the laser is parallel to the short side of the rectangular lens in the fly-eye lens, the slow axis direction of the laser is parallel to the long side of the rectangular lens in the fly-eye lens, and the sine value of the divergence angle in the fast axis direction of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle in the slow axis direction of the laser is greater than the sine value of the aperture angle of the short side of the rectangular lens.

2. The laser light source device according to claim 1, wherein the laser array comprises a plurality of lasers, the fly-eye lens comprises a plurality of rectangular lenses arranged in an array, and the spot area of ​​the laser beam emitted by one of the plurality of lasers on the fly-eye lens is greater than the area of ​​one of the rectangular lenses. 3 . The laser light source device according to claim 2 , wherein a spot area of ​​the laser beam emitted by one of the plurality of lasers on the fly-eye lens is greater than three times an area of ​​one of the rectangular lenses. 4 . The laser light source device according to claim 2 , wherein a sine value of a divergence angle in a fast axis direction of the laser is greater than a sine value of a divergence angle in a slow axis direction of the laser.

5. The laser light source device according to claim 1, wherein: The fly-eye lens includes a first fly-eye lens and a second fly-eye lens, and the first fly-eye lens is closer to the light transmission component than the second fly-eye lens. 6 . The laser light source device according to claim 2 , wherein a sine value of an aperture angle of a long side of the rectangular lens is greater than a sine value of an aperture angle of a short side of the rectangular lens.

7. The laser light source device according to claim 1, wherein the laser beam comprises a green laser, a blue laser, and a red laser; The light transmission component includes a first lens, a second lens and a third lens, and the first lens, the second lens and the third lens are all dichroic lenses; or The first lens is a reflector, and the second lens and the third lens are dichroic films. 8 . The laser light source device according to claim 7 , further comprising a collimating lens, wherein the collimating lens is located between the laser array and the light transmission component. 9 . The laser light source device according to claim 8 , further comprising a diffusion component, wherein the diffusion component is located between the light transmission component and the fly-eye lens, and the diffusion component comprises a diffusion wheel or a diffusion sheet. 10 . The laser light source device according to claim 9 , further comprising a beam reduction system, wherein the beam reduction system is located between the light transmission component and the fly-eye lens.

11. A projection device comprising: The laser light source device according to any one of claims 1 to 10, configured to emit an illumination light beam; an optical machine configured to modulate the illumination light beam to obtain a projection light beam; The lens is configured to form an image of the projection light beam.

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