Laser light source device and projection equipment

Abstract

The invention discloses a laser light source device and projection equipment, and belongs to the field of laser display. The laser light source device comprises a plurality of lasers, a light conduction assembly, fly's-eye lenses and a diffusion assembly, the light conduction assembly is used for combining laser emitted by the lasers to output three-color laser, the fly's-eye lenses comprise a plurality of rectangular lenses arranged in an array mode, a first fly's-eye lens and a second fly's-eye lens, and the first fly's-eye lens and the second fly's-eye lens are arranged in parallel. The fast axis direction of the laser is parallel to the short side of the rectangular lens in the fly's-eye lens, and the slow axis direction of the laser is parallel to the long side of the rectangular lens in the fly's-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 of the laser is greater than the sine value of the aperture angle of the short side of the rectangular lens; the diffusion assembly is located between the light conduction assembly and the fly-eye lens and used for dodging the three-color laser.

Description

[0001] This application is a divisional application of Chinese national phase invention application 202180083717.5 (2023-06-13), entitled "Laser Light Source Device and Projection Equipment".

[0002] Cross-references to related applications This application claims priority to Chinese Patent Application No. 202011597569.2, filed on December 29, 2020, entitled "Laser Light Source Device and Projection Equipment", the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] With people's increasing pursuit of color accuracy, laser projection, which boasts advantages such as large image size, high spectral brightness, and wide color gamut, has been developed. Among these advancements, three-color semiconductor lasers have begun to be used as laser light sources in laser projection technology. Summary of the Invention

[0005] The first aspect of this application provides a laser source device, the device including a laser array, a light transmission component and a compound eye lens arranged sequentially along the optical path direction, the compound eye lens including a plurality of rectangular lenses arranged in an array; The laser array includes multiple lasers arranged in an array. The fast axis of the laser is parallel to the short side of the rectangular lens in the compound eye lens, and the slow axis of the laser is parallel to the long side of the rectangular lens in the compound eye lens. The sine of the divergence angle of the fast axis of the laser is greater than the sine of the aperture angle of the long side of the rectangular lens, and the sine of the divergence angle of the slow axis of the laser is greater than the sine of the aperture angle of the short side of the rectangular lens.

[0006] A second aspect of this application provides a projection device, which includes the laser light source device described above. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of a laser source device provided in an embodiment of this application; Figure 2 yes Figure 1 A schematic diagram of the laser array structure of the laser source device shown; Figure 3 yes Figure 1 A schematic diagram of the compound eye lens of the laser source device shown; Figure 4 This is an optical path diagram of the laser source device provided in the embodiments of this application; Figure 5 yes Figure 1 A schematic diagram of a beam-contraction system in the laser source device shown; Figure 6 yes Figure 1 A schematic diagram of a compound eye lens in the laser source device shown; Figure 7 This is a schematic diagram of the structure of a projection device shown in an embodiment of this application. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0010] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific feature, structure, material, or characteristic may be included in any suitable manner in any one or more embodiments or examples.

[0011] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0012] Figure 1 This is a schematic diagram of the structure of a laser source device provided in an embodiment of this application, as shown below. Figure 1As shown, the laser source device 1 includes a laser array 11, a light transmission component 12, and a compound eye lens 13 arranged sequentially along the optical path. The compound eye lens 13 includes multiple rectangular lenses arranged in an array. The laser array 11 emits a laser beam, and the light transmission component 12 receives the laser beam emitted from the laser array 11 and guides it to the compound eye lens 13.

[0013] The laser array 11 includes multiple lasers arranged in an array. The fast axis of the laser is parallel to the short side of the rectangular lens in the compound eye lens 13, and the slow axis of the laser is parallel to the long side of the rectangular lens in the compound eye lens 13. The sine value of the divergence angle of the fast axis of the laser, sinα1, is greater than the sine value of the aperture angle β1 of the long side of the rectangular lens, sinβ1, i.e., sinα1 > sinβ1; the sine value of the divergence angle α2 of the slow axis of the laser, sinα2, is greater than the sine value of the aperture angle β2 of the short side of the rectangular lens, sinβ2, i.e., sinα2 > sinβ2.

[0014] In a laser, the direction of the light vector that propagates slowly is called the slow axis of the laser, and the direction of the light vector that propagates quickly is called the fast axis of the laser. Figure 2 yes Figure 1 The schematic diagram of the laser array of the laser source device shown is as follows: Figure 2 As shown, in the laser array of the laser source device provided in this embodiment, the fast axis direction of the laser is f1 and the slow axis direction is f2.

[0015] Furthermore, the divergence angle of a laser is used to measure the speed at which the beam diverges outward from the beam waist (the beam waist refers to the position where the beam radius is smallest in the direction of beam propagation; 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, by using a beam analyzer to measure the beam radius at different positions, and thus obtaining the divergence angle of the laser.

[0016] Figure 3 yes Figure 1 The schematic diagram of the compound eye lens of the laser source device shown is as follows: Figure 3 As shown, the compound eye lens 13 includes multiple rectangular lenses 131 arranged in an array.

[0017] The compound eye lens divides the light beam into N (where N is the number of rectangular lenses in the compound eye lens) channels 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 from each channel, thus greatly improving the uniformity of the illuminated object surface.

[0018] In the application of compound eye lenses, two columns of compound eye lens arrays are arranged in parallel. The focal point of each rectangular lens in the first column of the compound eye lens array coincides with the center of the corresponding rectangular lens in the second column of the compound eye lens array. The optical axes of the two columns of compound eye lenses are parallel to each other, which can divide the light spot of the input laser beam. Then, the divided light spots are accumulated by subsequent focusing lenses, thereby achieving beam homogenization and light spot optimization.

[0019] In addition, the compound eye lens, which serves as a light-diffusing device, is relatively small in size, which reduces the size of the laser light source device and further reduces the size of the projection device using the laser light source device, making the projection device thinner and more aesthetically pleasing, and providing a better user experience.

[0020] In summary, this application provides a laser source device comprising a laser array, an optical transmission component, and a compound eye lens. The laser array includes multiple lasers arranged in an array, and the compound eye lens includes multiple rectangular lenses. The sine of the divergence angle of the fast axis of the laser is greater than the sine of the aperture angle of the long side of the rectangular lens, and the sine of the divergence angle of the slow axis is greater than the sine of the aperture angle of the short side of the rectangular lens. This correlation between the parameters of the laser and the parameters of the compound eye lens facilitates the achievement of uniform light distribution using the compound eye lens. Furthermore, compared to an optical guide, the compound eye lens has a smaller dimension in the optical path direction, resulting in a smaller overall size for the laser source device. This solves the problem of excessively large laser source devices in related technologies, achieving a reduction in the size of the laser source device.

[0021] In one specific implementation, please refer to Figure 2 and Figure 3 The laser array 11 includes multiple lasers 111, and the compound eye lens 13 includes multiple 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 compound eye lens 13 are uniformly 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 a·b. Meanwhile, in this embodiment, the area S2 of the laser spot 111 is greater 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 compound eye lenses, so that the spot is divided as many times as possible to achieve the requirement of uniform laser beam.

[0022] 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 spot is divided into multiple parts by the rectangular lenses in the compound eye lens, and then the divided spots are superimposed by the subsequent focusing lens, thereby achieving beam homogenization.

[0023] In one specific implementation, the sine value of the divergence angle of the fast axis of the laser, sinα1, is greater than the sine value of the divergence angle of the slow axis, sinα2. Specifically, the divergence angle of the fast axis of the array laser output beam can range from 40 degrees to 90 degrees, and the divergence angle of the slow axis can be 10 degrees.

[0024] 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 emitted by the red laser 111a has a wavelength ranging from 638 nm to 650 nm. The laser wavelength range of the blue laser 111b is 445 nm to 450 nm, and the laser wavelength range of the green laser 111c is 532 nm to 556 nm. The wavelength of the laser refers to the wavelength of the output laser light from the laser.

[0025] For example, such as Figure 2 As shown, laser 111 includes two sets of red lasers 111a, one set of blue lasers 111b, and one set of green lasers 111c. In one embodiment, the lasers within the laser are arranged in a row of seven lasers, with four rows in total. The first row is set with green lasers 111c, the second row with blue lasers 111b, and the third and fourth rows with red lasers 111a.

[0026] Meanwhile, the fast axis direction f1 of laser 111 is parallel to the column direction of laser 111, and the slow axis direction f2 is parallel to the row direction of laser 111.

[0027] Furthermore, the red, blue, and green lasers emitted by the 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 obtained by changing the frequency and intensity of these three primary colors. Additionally, white light can be formed by mixing red, blue, and green lasers in equal proportions.

[0028] In one specific implementation, the sine value of the aperture angle β1 of the long side of the rectangular lens, sinβ1, is greater than the sine value of the aperture angle β2 of the short side of the rectangular lens, sinβ2.

[0029] In one specific implementation, please refer to Figure 4 , Figure 4This is an optical path diagram of the laser source device provided in this application embodiment. The light transmission component 12 includes a step mirror 121, which includes a reflector 1211 and a dichroic filter 1212. The reflector 1211 is located between the green laser 111c and the compound eye lens 13. The reflector 1211 is used to bend the optical path and guide the green laser emitted by the green laser 111c to the dichroic filter 1212.

[0030] In this embodiment of the application, the dichroic filter 1212 includes a first dichroic filter 1212a and a second dichroic filter 1212b, such as Figure 4 As shown, the first dichroic filter 1212a is located between the blue laser 111b and the compound eye lens 13, and the second dichroic filter 1212b is located between the two sets of red lasers 111a and the compound eye lens 13.

[0031] Dichroic filters, also known as light combiners, are a type of color filter that can selectively transmit a certain color of light and reflect other colors. Dichroic filters have high transmittance (up to 97%) and high reflection efficiency (greater than 99%). They also have advantages such as low absorption, low dispersion, low laser loss, and no distinction between film surfaces.

[0032] The first dichroic filter 1212a is used to reflect the blue laser emitted by the blue laser 111b and transmit the green laser emitted by the green laser 111c; the second dichroic filter 1212b is used to reflect the red laser emitted by the red laser 111a and transmit the blue laser and green laser emitted by the first dichroic filter 1212a.

[0033] In addition, such as Figure 4 As shown, the blue laser reflected by the first dichroic color filter 1212a and the transmitted green laser are in the same direction, and this direction y is perpendicular to the emission direction x of the laser 111. Similarly, the red laser reflected by the second dichroic color filter 1212b and the transmitted green and blue lasers are in the same direction, and this direction y is perpendicular to the emission direction x of the laser 111. This structure allows the red, blue, and green lasers emitted by the laser to be combined through the light transmission component 12. At the same time, the light transmission component 12 also bends the laser beam path, shortening the distance of the laser beam path parallel to the emission direction of the laser 111. This makes the components in the laser source device more compact and the space utilization rate higher, thus reducing the size of the laser source device and the weight of the system, to meet the requirements of miniaturization of the laser source device.

[0034] In a specific implementation, such as Figure 4 As shown, the reflector 1211 in the light transmission assembly 12 can be placed at a 45-degree angle. That is, when the green laser emitted by the green laser 111c enters the reflector 1211, the incident angle is 45 degrees.

[0035] In one specific implementation, the dichroic filter 1212 in the laser light source device shown in the embodiments of this application can be a 45-degree dichroic filter, that is, the dichroic filter is placed at a 45-degree angle to the emission direction x of the laser 111.

[0036] In one specific implementation, please refer to Figure 1 The laser source device 1 also includes a collimating lens 14, which is located between the laser array 11 and the optical transmission component 12. The laser array 11 emits a three-color beam, which is incident on the collimating lens 14. The collimating lens 14 is used to collimate the laser beam in the optical path and form a parallel emitted laser. Due to the inherent characteristics of laser, the laser beam emitted by the laser array 11 may have an uneven intensity distribution, such as bright spots or stripes of various shapes. Through the parallel emission effect of the collimating lens 14, a parallel laser beam is formed, which is then redirected by the optical transmission component 12 and the three-color laser beams are combined. This structure reduces the spatial coherence of the laser beam and suppresses laser speckle.

[0037] In one specific embodiment, the laser source device 1 further includes a diffusion component 15, located between the light transmission component 12 and the compound eye lens 13. The diffusion component 15 includes a diffusion wheel or a diffusion sheet. Since the light source is a pure three-color laser source, the laser will exhibit speckle phenomenon (speckle phenomenon refers to the granular structure on the surface of an object illuminated by a laser). Lasers have high coherence; therefore, when the laser is reflected from the object's surface, 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 wavelets emitted from each point on the rough surface. Because the roughness of the surface is greater than the laser wavelength, the phases of the wavelets emitted from each point on the object reaching the observation point are randomly distributed. This coherent superposition produces a speckle pattern, and the intensity of the speckle pattern is randomly distributed. In this embodiment, the diffusion component 15 can be a diffusion wheel or a diffusion sheet, used to homogenize the three-color laser light to reduce uneven energy distribution of the laser spot.

[0038] When the diffuser wheel is in operation, it rotates along its axis at a certain frequency. The rotating diffuser wheel can generate some random phase in space for the laser beam, thus interfering with the coherence of the laser and reducing the phenomenon of uneven laser spot distribution.

[0039] In one specific embodiment, the laser source device 1 further includes a beam-shrinking system 16, which is located between the optical transmission system 12 and the compound eye lens 13. If the spot size of the laser emitted by the laser 111 is too large, the laser emitted by the laser 111 can be beam-shrinked to improve the diffusion efficiency. Figure 5 yes Figure 1 The diagram shown illustrates the structure of a beam-contraction system in a laser source device, as follows: Figure 5 As shown, the beam-reducing 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 receives an incident light beam whose incident direction is parallel to its optical axis, converges the incident light beam, and reflects it to the concave lens 1611. The concave lens 1611 then diverges the received light beam and emits the beam in a direction parallel to its own. This structure, by converging a large-aperture light beam through the convex lens and emitting it through the concave lens, and then diverging the beam through the concave lens to form a smaller-aperture emitted light beam, achieves the beam-reducing effect.

[0040] In one specific implementation, the laser source device 1 further includes a diffusion component 15 and a beam-contracting system 16. In another implementation, the laser source device may simultaneously include a diffusion component 15 and a beam-contracting system 16, wherein the beam-contracting system 16 is located between the diffusion component 15 and the optical transmission component 12.

[0041] In one specific implementation, please refer to Figure 4 The laser source device 1 also includes a half-wave plate 17. The half-wave plate 17 is located between the two sets of red lasers 111a and the second dichroic plate 1212b, and the plane of the half-wave plate 17 is perpendicular to the direction of the emitted beam from the red laser 111a. The half-wave plate can change the polarization direction of the laser polarized light, thereby improving the consistency of the projection optical system and the projection screen in processing the three-color laser light, and further solving the color deviation problems such as "color spots" or "color blocks" in the three-color laser projection image.

[0042] Figure 6 yes Figure 1 The schematic diagram shown is of a compound eye lens in the laser source device. Figure 4 and Figure 6 As shown, the compound eye lens 13 includes a first compound eye lens 131 and a second compound eye lens 132 arranged in parallel. The first compound eye lens 131 is used to receive the light beam emitted from the light transmission component 12, and the second compound eye lens 132 is used to emit the homogenized light beam. The number of rectangular lenses on the first compound eye lens 131 and the second compound eye lens 132 are equal and correspond one-to-one.

[0043] like Figure 6As shown, the light beam enters the first compound eye lens 131 perpendicularly along the y-direction, forming a parallel beam parallel to the optical axis. After passing through the first compound eye lens 131, the beam is focused at the center of the second compound eye lens 132. That is, the first compound eye lens 131 forms multiple light source images for illumination. Each rectangular lens of the second compound eye lens 132 superimposes the corresponding rectangular lens on the first compound eye lens 131 to form an image. The light spot emitted from the second compound eye lens 132 is then focused onto the display screen by a subsequent condenser lens. In this structure, the first row of compound eye lenses 131 divides the entire wide beam of light from the light source into multiple narrow beams. Due to the superposition of these narrow beams in symmetrical positions, the slight non-uniformities within each narrow beam are compensated, thereby effectively and uniformly utilizing the light energy throughout the entire aperture, achieving beam homogenization.

[0044] In one specific embodiment, the first compound eye lens can be integrally formed with the second compound eye lens using a substrate. The substrate material can be glass or other light-transmitting material. The first compound eye lens is located on one side of the substrate, and the second compound eye lens is located on the other side. This structure not only facilitates installation but also saves space occupied by the compound eye lenses, further reducing the size of the laser light source device and making its appearance more aesthetically pleasing.

[0045] In summary, this application provides a laser source device comprising a laser array, an optical transmission component, and a compound eye lens. The laser array includes multiple lasers arranged in an array, and the compound eye lens includes multiple rectangular lenses. The sine of the divergence angle of the fast axis of the laser is greater than the sine of the aperture angle of the long side of the rectangular lens, and the sine of the divergence angle of the slow axis is greater than the sine of the aperture angle of the short side of the rectangular lens. This correlation between the parameters of the laser and the parameters of the compound eye lens facilitates the achievement of uniform light distribution using the compound eye lens. Furthermore, compared to an optical guide, the compound eye lens has a smaller dimension in the optical path direction, resulting in a smaller overall size for the laser source device. This solves the problem of excessively large laser source devices in related technologies, achieving a reduction in the size of the laser source device.

[0046] In addition, this application also provides a projection device, please refer to... Figure 7 , Figure 7 This is a schematic diagram of the structure of a projection device shown in an embodiment of this application. The projection device includes a reflector 2, a light valve 3, a total reflection prism 4, a galvanometer 5, a lens assembly 6, a screen 7, and a laser light source device 1 provided in the above embodiment.

[0047] The laser source device 1, reflector 2, light valve 3, total internal reflection prism 4, galvanometer 5, and lens assembly 6 are arranged sequentially along the optical path. The laser source device 1 provides an illumination beam. The reflector 2 deflects the beam provided by the laser source device 1. The total internal reflection prism 4 receives the beam from the reflector 2 and guides it to the light valve 3. The light valve 3 receives the beam and modulates it to form an image beam. Then, in conjunction with the galvanometer 5 and the total internal reflection prism 4, the beam is guided to the lens assembly 6. The lens assembly 6 receives the image beam, corrects and magnifies it, and projects it onto the screen 7. The galvanometer 5 is located between the total internal reflection prism 4 and the lens assembly 6. The total internal reflection prism 4 directs the image beam modulated by the light valve 3 towards the galvanometer 5. The galvanometer 5 vibrates at a preset frequency, causing the beams passing through it to overlap and enter the lens assembly 6.

[0048] The light valve (digital micromirror device, or DMD) is a digital micromirror element that can digitally modulate light. The light valve comprises an array of multiple high-speed digital light-reflecting micromirrors, which correspond to the light rays in the projected image. When these micromirrors work in conjunction with digital signals, a light source, and a projection lens, the image can be faithfully reproduced.

[0049] Digital signals activate the microelectrodes beneath each micromirror. These microelectrodes then push the micromirror's surface towards or away from the light source. When the micromirror's surface faces the light source (i.e., the micromirror is in the open state), a white pixel is reflected through the lens assembly onto the screen in the projection device. When the micromirror's surface avoids the light source (i.e., the micromirror is in the closed state), the micromirror pixel appears as a dark color on the screen. Therefore, each of the multiple small mirrors in the light valve corresponds to a pixel, and the number of mirrors determines the display resolution of the light valve. For example, a 4K resolution light valve could have a micromirror array arrangement of 4096*2160.

[0050] Meanwhile, the micromirrors can open and close at a speed of 5000 times per second (meaning the micromirrors in the light valve can rotate thousands of times per second). Therefore, by changing the opening and closing times of the various micromirrors, different levels of grayscale can be produced. For example, if the micromirror is open for a longer time than it is closed, the resulting grayscale pixel will be lighter; if the micromirror is closed for a longer time than it is open, the resulting grayscale pixel will be darker.

[0051] Furthermore, during the operation of the light valve, micromirrors reflect light by rotating, with each micromirror's rotation controlled by a microelectrode located beneath it. Simultaneously, each micromirror reflects only one color during a single rotation. For example, the micromirror projecting purple pixels projects only red and blue light onto the screen (red and blue light combine to form purple light), while the micromirror projecting orange pixels reflects only red and green light proportionally onto the screen (red light predominates, green light predominates). Because the micromirrors open and close rapidly, light is projected onto the screen through the lens assembly. The human visual system mixes the rapidly flashing three colors together, and due to the persistence of vision, a clear image is perceived on the screen.

[0052] The light valve 2 can be 2K resolution, 3K resolution or higher resolution, and this application embodiment does not limit it.

[0053] Total internal reflection (TIR) ​​prism 4 is located between galvanometer 5 and light valve 3. TIR prism 4 is used to convert the light beam emitted from light valve 2 into a parallel beam, thereby improving the smoothness of the final image on screen 7. For example... Figure 7 As shown, the laser beam emitted from the laser source device 1 is then deflected by the reflector 2. The deflected beam enters the total internal reflection prism 4, which guides the beam to the light valve 3. The light valve 3 receives the beam, modulates it, and forms an image beam. This beam then enters the total internal reflection prism 4 again, and is then transformed into parallel light. The parallel light is incident on the galvanometer 5, and then emitted through the galvanometer 5 to the lens assembly 6, where it is finally imaged on the screen 7.

[0054] The reflector 2 is used to deflect the path of the laser beam emitted from the laser source device 1. In one specific embodiment, the reflector 2 can be placed at a 45-degree angle to the direction of laser emission. This structure deflects the optical path of the laser emitted from the laser source device 1 by 90 degrees, which can shorten the length of the optical path in the direction of laser emission and further reduce the size of the projection device.

[0055] The total internal reflection prism 6 can be a prism with a right-angled triangle cross-section, or it can be a prism with a right-angled triangle cross-section bonded together with a compensation prism. This application does not limit this.

[0056] Meanwhile, when the total internal reflection prism is used for illumination, it achieves total internal reflection in the illumination optical path, which can reflect all the light incident on the prism to the light valve; when the total internal reflection prism is used in an ultra-short focal length lens system, the total internal reflection prism can be used as a flat glass, which can effectively control the impact of dust on the system's imaging quality.

[0057] In addition, the galvanometer 3 may include an optical lens and a driving component. The driving component drives the optical lens to swing continuously around a preset rotation axis, and the optical lens can change the direction of the beam accordingly. The optical lens may be a flat glass or a reflector.

[0058] For example, when the light beam incident on the galvanometer is a parallel beam (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 in the projected image corresponding to the image beam is equal. This ensures that the offset of each field of view in the projection lens from the projection screen is consistent, thus guaranteeing high-resolution display of the visual image. Here, the offset of the field of view refers to the actual displacement distance of the field of view. Therefore, since the light beam emitted from the galvanometer is parallel, the high-frequency vibration of the galvanometer can achieve a conversion from 2K or 3K resolution to 4K resolution. This structure reduces the complexity of system design.

[0059] With the addition of a galvanometer, a 2K resolution optical valve can achieve 4K resolution when used in conjunction with the galvanometer. A 4K resolution optical valve can also achieve 8K resolution when used in conjunction with the galvanometer, improving resolution while maintaining a compact overall size.

[0060] In one specific implementation, the flatness of the galvanometer is less than 3 fringes, and the irregularity is less than 1 / 2 fringe. Flatness refers to the deviation of the macroscopic unevenness of the substrate relative to an ideal plane. The flatness error is calculated by comparing the actual surface to be measured with the ideal plane and the linear distance between them; alternatively, the flatness error value can be calculated by measuring the relative height difference between several points on the actual surface and then converting it into a linear value. The method for measuring flatness error can refer to related technologies, and is not limited to the embodiments of this application. The flatness of the reflector used in this application is less than 3 fringes, and the irregularity is less than 1 / 2 fringe. Specific flatness is not limited to the embodiments of this application.

[0061] In summary, this application provides a projection device including a light valve, a galvanometer, a lens assembly, a screen, and the laser source device provided in Embodiment 1. The laser source device includes a laser array, a light transmission assembly, and a compound eye lens. The sine of the divergence angle of the fast axis of the laser is greater than the sine of the aperture angle of the long side of the rectangular lens, and the sine of the divergence angle of the slow axis is greater than the sine of the aperture angle of the short side of the rectangular lens. This correlation between the parameters of the laser and the compound eye lens facilitates the achievement of uniform light distribution through the compound eye lens. Furthermore, compared to a light guide, the compound eye lens has a smaller dimension in the optical path direction, resulting in a smaller laser source device and further reducing the overall size of the projection device, making it thinner and more aesthetically pleasing. This solves the problem of excessively large laser source devices in related technologies, achieving the effect of reducing the size of the laser source device.

[0062] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laser source device, comprising: Multiple lasers are configured to emit laser beams; An optical transmission component, disposed on the light-emitting side of the plurality of lasers, is configured to combine the laser beams, wherein the combined beams are tri-color lasers; A compound eye lens, disposed on the light-emitting side of the light transmission component, is configured to homogenize the laser beam; The compound eye lens includes: a plurality of rectangular lenses arranged in an array; and the compound eye lens includes a first compound eye lens and a second compound eye lens arranged in parallel, the first compound eye lens being used to receive the light beam emitted by the light transmission component, the second compound eye lens being used to emit the homogenized light beam, and the number of rectangular lenses on the first compound eye lens and the second compound eye lens being equal and corresponding one-to-one. The fast axis of the laser is parallel to the short side of the rectangular lens in the compound eye lens, and the slow axis of the laser is parallel to the long side of the rectangular lens in the compound eye lens. Furthermore, the sine value of the divergence angle of the laser along the fast axis 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 laser along the slow axis is greater than the sine value of the aperture angle of the short side of the rectangular lens. A diffusion component, located between the light transmission component and the compound eye lens, is used for homogenizing the three-color laser light.

2. The laser source device according to claim 1, characterized in that, The diffusion component is a diffusion wheel or a diffusion sheet.

3. The laser source device according to claim 1, characterized in that, The sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the divergence angle of the slow axis of the laser.

4. The laser source device according to claim 1, characterized in that, The first compound eye lens is integrally formed with the second compound eye lens via a substrate, with the first compound eye lens located on one side of the substrate and the second compound eye lens located on the other side of the substrate.

5. The laser source device according to claim 1, characterized in that, The area of ​​the laser beam emitted by one of the plurality of lasers on the compound eye lens is greater than three times the area of ​​one of the rectangular lenses.

6. The laser source device according to claim 1, characterized in that, The sine value of the divergence angle of the laser beam in the fast axis direction is greater than the sine value of the divergence angle of the laser beam in the slow axis direction.

7. The laser source device according to claim 1, characterized in that, The sine value of the aperture angle of the long side of the rectangular lens is greater than the sine value of the aperture angle of the short side of the rectangular lens.

8. The laser source device according to claim 1, wherein, The plurality of lasers includes a red laser, a blue laser, and a green laser, which are used to emit red laser, blue laser, and green laser respectively, wherein the wavelength of the red laser is 638 nanometers to 650 nanometers, the wavelength range of the blue laser is 445 nanometers to 450 nanometers, and the wavelength range of the green laser is 532 nanometers to 556 nanometers.

9. The laser source device according to claim 1, characterized in that, It also includes a half-wave plate, which is disposed in the optical path of the red laser to change the polarization direction of the red laser.

10. The laser source device according to claim 1, characterized in that, It also includes a collimating lens, which is located between the plurality of lasers and the optical transmission component.

11. A projection device, characterized in that, include: The laser light source device according to any one of claims 1-10 is used to provide an illumination beam; A light valve is used to receive the illumination beam and modulate it to obtain a projection beam. as well as, A lens for projecting the projection beam into an image.

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