Laser lighting device and holographic head-up display system

Abstract

The embodiment of the present invention relates to the field of laser display technology, and discloses a laser lighting device and a holographic head-up display system. The laser lighting device includes: a laser light source, a beam expansion module, a beam splitting module and a steering module; the laser light source is used to output a laser beam; the beam expansion module is used to receive the laser beam, and convert the laser beam into a parallel beam and output it; the beam splitting module is arranged between the beam expansion module and the steering module, and the beam splitting module is used to receive the parallel beam, and divide the parallel beam into a plurality of first sub-beams and output them; the steering module is used to receive all the first sub-beams, and divide each of the first sub-beams into a plurality of second sub-beams and output them, and the output directions of all the second sub-beams are the same, and the transmission directions of the first sub-beam and the second sub-beam are different. In the above manner, the present embodiment only needs to use one light source to obtain a larger display image, which can meet the demand of low cost.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of laser lighting technology, and in particular to a laser lighting device and a holographic head-up display system. Background Art

[0002] The Head Up Display (HUD) system refers to a driver-centric, blindly operated multi-function instrument panel that is used to project important information such as speed and navigation onto the windshield in front of the driver, allowing the driver to see important information without lowering or turning his head.

[0003] like Figure 1 As shown, the existing head-up display system includes an image generator 1, a first curved reflector 2 and a second curved reflector 3. The image generator 1 and the first curved reflector 2 and the second curved reflector 3 are respectively arranged in a triangle. The image display light beam emitted by the image generator 1 is expanded by the first curved reflector 2 and the second curved reflector 3 in sequence, and then the image is displayed on the windshield 4, so that the driver can see the image from the windshield 4.

[0004] The inventors of the present invention found in the process of implementing the embodiments of the present invention that a holographic head-up display requires a large-aperture parallel laser, so the laser light source of the image generator also needs to be increased, which is costly. Summary of the invention

[0005] The main technical problem solved by the embodiments of the present invention is to provide a laser lighting device and a holographic head-up display system, which can obtain a larger display image by using only one light source and can meet the demand for low cost.

[0006] To solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: providing a laser lighting device, comprising: a laser light source, a beam expansion module, a beam splitting module and a steering module; the laser light source is used to output a laser beam; the beam expansion module is used to receive the laser beam, and convert the laser beam into a parallel beam and output it; the beam splitting module is arranged between the beam expansion module and the steering module, and the beam splitting module is used to receive the parallel beam, and split the parallel beam into a plurality of first sub-beams and output them; the steering module is used to receive all the first sub-beams, and split each of the first sub-beams into a plurality of second sub-beams and output them, the output directions of all the second sub-beams are the same, and the transmission directions of the first sub-beams and the second sub-beams are different.

[0007] Optionally, the beam expansion module includes: a first lens and a second lens; the first lens is used to receive the laser beam output by the laser light source, and expand and output the laser beam in a first direction; the second lens is used to receive the laser beam output by the first lens, and expand and output the laser beam in a second direction to output the parallel beam.

[0008] Optionally, the shapes of the first lens and the second lens are both semi-cylindrical, the rectangular side of the first lens is opposite to the laser light source, the rectangular side of the second lens is opposite to the arcuate side of the first lens, and the long side of the rectangular side of the first lens is orthogonal to the long side of the rectangular side of the second lens.

[0009] Optionally, the laser light source is a fiber-coupled laser light source, a diode laser light source or a solid laser light source.

[0010] Optionally, the beam splitting module includes a first reflector and at least one beam splitting prism; the at least one beam splitting prism and the first reflector are arranged in a straight line, and the first reflector is located at one end, and the beam splitting prism located at the other end is used to receive the parallel light beam; each of the beam splitting prisms has light reflection and light transmission properties, the first reflector has light reflection properties, and the parallel light beam is transmitted from the beam splitting prism located at the other end to the first reflector. During the transmission of the parallel light beam, each of the beam splitting prisms separates a first sub-beam from the parallel light beam and outputs it, and the first reflector outputs the remaining part of the parallel light beam as a first sub-beam.

[0011] Optionally, the first reflector and at least one of the beam splitting prisms are arranged in parallel, and an incident angle of the parallel light beam incident on the hypotenuse surface of the beam splitting prism located at the other end is 45 degrees.

[0012] Optionally, there are several beam splitting prisms, and the light intensity ratios of the reflected light and the transmitted light from the beam splitting prism located at the other end to the beam splitting prism located at one end of the first reflector are respectively: (n-1) / n:(1 / n), [1 / (n-1)]:(n-2) / (n-1), (n-3) / (n-2):[1 / (n-2)], ..., 1 / 2:1 / 2; wherein n is the number of beam splitting prisms.

[0013] Optionally, the steering module includes a second reflector and at least one steering prism; the at least one steering prism and the second reflector are arranged in sequence, the second reflector is located at one end, the steering prism has light reflection and light transmission properties, and the second reflector has light reflection properties; the lengths of the steering prism and the second reflector are the same as the length of the beam splitting module, the steering prism located at the other end receives all first sub-beams, and each of the first sub-beams is transmitted to the second reflector by the steering prism located at the other end. During the transmission of the first sub-beams, each steering prism separates a second sub-beam from the first sub-beam and outputs it, and the second reflector outputs the remaining part of the first sub-beam as a second sub-beam.

[0014] Optionally, there are several steering prisms, and the light intensity ratios of the reflected light and the transmitted light from the steering prism located at the other end to the steering prism located at one end of the second reflector are respectively: (1 / m): (m-1) / m, (m-2) / (m-1): [1 / (m-1)], [1 / (m-2)]: (m-3) / (m-2), ..., 1 / 2: 1 / 2; wherein m is the number of beam splitting prisms.

[0015] To solve the above technical problems, another technical solution adopted by an embodiment of the present invention is: to provide a holographic head-up display system, comprising the above-mentioned laser lighting device and display module, wherein the second sub-beam output by the laser lighting device illuminates the display module to project an image display beam.

[0016] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, the embodiments of the present invention provide a laser lighting device and a holographic head-up display system, which output a parallel light beam by setting a beam expansion module, and the beam splitting module divides the parallel light beam into several first sub-beams with the same light intensity, and the steering module divides each first sub-beam into several second sub-beams. Through the above method, only one light source is needed to obtain a larger display image, which can meet the low cost requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more implementations are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 It is a structural schematic diagram of a head-up display system in the prior art;

[0019] Figure 2 A schematic structural diagram of a laser lighting device provided by one embodiment of the present invention;

[0020] Figure 3 for Figure 2 A schematic structural diagram of a first lens and a second lens of a laser lighting device;

[0021] Figure 4a for Figure 2 A schematic diagram of the structure of a beam splitting module of a laser illumination device;

[0022] Figure 4b for Figure 2 A schematic diagram of the structure of a beam splitting module of a laser illumination device;

[0023] Figure 5 for Figure 2 A schematic structural diagram of a steering module of a laser lighting device;

[0024] Figure 6 A schematic structural diagram of a holographic head-up display system provided by another embodiment of the present invention;

[0025] Figure 7 A schematic structural diagram of a holographic head-up display system provided by another embodiment of the present invention;

[0026] Figure 8 for Figure 7 Schematic diagram of the functional modules of the holographic head-up display system. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connecting" another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "vertical", "horizontal", "left", "right", "up", "down", "inside", "outside", "bottom", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0029] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] The laser lighting device in the embodiment of the present invention can provide a large-aperture parallel light beam through a single light source. A larger display image can be obtained by using only one light source without setting up multiple light sources, thus meeting the demand for low cost.

[0031] The laser lighting device in the embodiment of the present invention can be applied to the holographic head-up display system in this embodiment to reduce the cost of the holographic head-up display system.

[0032] Specifically, the laser lighting device and the holographic head-up display system will be described below through embodiments.

[0033] Embodiment 1

[0034] See also Figure 2 , is a schematic diagram of the structure of a laser lighting device provided by one embodiment of the present invention. Figure 2 As shown, the laser lighting device 100 includes a laser light source 10 , a beam expansion module 20 , a beam splitting module 30 and a steering module 40 .

[0035] The laser light source 10 is used to output a laser beam, the beam expansion module 20 is used to receive the laser beam, and convert the laser beam into a parallel beam and output it, the beam splitting module 30 is arranged between the beam expansion module 20 and the steering module 40, the beam splitting module 30 is used to receive the parallel beam, and divide the parallel beam into a plurality of first sub-beams and output them; the steering module 40 is used to receive all the first sub-beams, and divide each first sub-beam into a plurality of second sub-beams and output them, the output directions of all the second sub-beams are the same, and the transmission directions of the first sub-beams and the second sub-beams are different. In this embodiment, the first sub-beam is perpendicular to the second sub-beam. In the above manner, large-aperture parallel light can be obtained without the need to use multiple light sources, and the cost is low.

[0036] The laser light source 10 may be a fiber coupled laser light source, a diode laser light source or a solid laser light source. The laser light source 10 may include a red laser light source, a green laser light source and a blue laser light source. By using three primary color lasers, the laser light source 10 can reproduce the rich and gorgeous colors of the objective world most realistically and provide more shocking expression. For example, a red, green and blue laser light source is obtained by using a laser diode pumped all-solid-state laser and frequency doubling technology.

[0037] The beam expansion module 20 is disposed on a side of the laser light source 10 emitting the laser beam, so as to receive the laser beam output by the laser light source 10 and expand the laser beam.

[0038] The beam expansion module 20 includes a first lens 21 and a second lens 22. The first lens 21 is disposed on a side relatively close to the laser light source 10, and the second lens 22 is disposed on a side relatively far from the laser light source 10. The first lens 21 is used to receive the laser beam output by the laser light source 10, and expand and output the laser beam in a first direction. The second lens 22 is used to receive the laser beam output by the first lens 21, and expand and output the laser beam in a second direction to output a parallel beam.

[0039] The first direction is perpendicular to the second direction. For example, the first direction may be a horizontal direction, and the second direction may be a vertical direction, so that the laser beam is expanded to output a rectangular parallel beam.

[0040] Among them, the shapes of the first lens 21 and the second lens 22 are both semi-cylindrical, the rectangular side of the first lens 21 is opposite to the laser light source 10, the rectangular side of the second lens 22 is opposite to the arcuate side of the first lens 21, and the long side of the rectangular side of the first lens 21 is orthogonal to the long side of the rectangular side of the second lens 22.

[0041] Please also refer to Figure 2The first lens 21 is provided with a first rectangular side surface 211, a first arcuate side surface 212 and a first semicircular cross section 213. There are two first semicircular cross sections 213. The two first semicircular cross sections 213 are respectively perpendicularly arranged at two opposite sides of the first rectangular side surface 211. The first arcuate side surface 212 is respectively connected to the first rectangular side surface 211 and the two first semicircular cross sections 213. The second lens 22 is provided with a second rectangular side surface 221, a second arcuate side surface 222 and a second semicircular cross section 223. There are two second semicircular cross sections 223. The two second semicircular cross sections 223 are respectively perpendicularly arranged at two opposite sides of the second rectangular side surface 221. The second arcuate side surface 222 is respectively connected to the second rectangular side surface 221 and the two second semicircular cross sections 223. The first rectangular side surface 211 is a rectangular side surface of the first lens 21, and the second rectangular side surface 221 is a rectangular side surface of the second lens 22. Specifically, the first rectangular side 211 is opposite to the laser light source 10, the second rectangular side 221 is opposite to the first arc-shaped side 212, the second arc-shaped side 222 is opposite to the beam splitting module 30, and the long side of the first rectangular side 211 is orthogonal to the long side of the second rectangular side 221, the first semicircular section 213 is perpendicular to the second semicircular section 223, the first semicircular section 213 is perpendicular to the horizontal plane, and the second semicircular section 223 is parallel to the horizontal plane, so that the first lens 21 and the second lens 22 are arranged orthogonally.

[0042] It is understandable that in some other embodiments, the position of the first lens 21 and the position of the second lens 22 can be interchanged, so that the laser beam first passes through the second lens 22 to expand in the second direction, and then passes through the first lens 21 to expand in the first direction.

[0043] Please also read Figure 4a and Figure 4b The beam splitting module 30 is arranged on one side of the emission direction of the parallel light beam of the second lens 22 of the beam expansion module 20, so as to receive the parallel light beam. The beam splitting module 30 includes a first reflector 31 and at least one beam splitting prism 32. At least one beam splitting prism 32 and the first reflector 31 are arranged in a straight line, and the first reflector 31 is located at one end. The beam splitting prism 32 located at the other end is used to receive the parallel light beam. Each beam splitting prism 32 has light reflection and light transmission properties, and the first reflector 31 has light reflection properties. The parallel light beam is transmitted from the beam splitting prism 32 located at the other end to the first reflector 31. In the process of parallel light beam transmission, each beam splitting prism 32 separates a first sub-beam from the parallel light beam and outputs it, and the first reflector 31 outputs the remaining part of the parallel light beam as a first sub-beam.

[0044] Among them, the first reflector 31 can be a reflecting plane mirror or a beam splitter prism. When the first reflector 31 is a reflecting plane mirror, the first reflector 31 is parallel to the hypotenuse surface of the beam splitter prism 32; when the first reflector 31 is a beam splitter prism, the light intensity ratio of the reflected light and the transmitted light of the first reflector 31 is 1:0, so that the first reflector 31 achieves light reflection performance.

[0045] The beam splitter prism 32 is a beam splitter prism, which is in a cube shape, and the hypotenuse of the beam splitter prism 32 is coated with a beam splitter film, so that the beam splitter prism 32 can achieve light reflection and light transmission performance. The hypotenuse surface is a surface formed by the hypotenuse of each surface of the beam splitter prism 32.

[0046] The first reflector 31 and at least one beam splitter prism 32 are both arranged in parallel. For example, when the first reflector 31 is a reflective plane mirror, the first reflector 31 is parallel to the hypotenuse of the beam splitter prism 32. Moreover, the incident angle of the parallel light beam incident on the hypotenuse of the beam splitter prism 32 at the other end is 45 degrees, so that the first sub-beam reflected by the beam splitter prism 32 is emitted at 45 degrees to the hypotenuse of the beam splitter prism 32.

[0047] It is understandable that in some other embodiments, the incident angle of the parallel light beam incident on the hypotenuse surface of the beam splitter prism 32 at the other end can be greater than or less than 45 degrees, as long as the hypotenuse surfaces of each beam splitter prism 32 and the first reflector 31 are parallel.

[0048] The number of the beam splitting prisms 32 is several, and the number of the beam splitting prisms 32 can be freely set according to the required image size. Figure 4a, when the incident direction of the parallel light beam is the same as the emitting direction of the first sub-beam, the intensity ratios of the reflected light and the transmitted light from the beam splitter prism 32 at the other end to the beam splitter prism 32 at one end of the first reflector 31 are respectively: (n-1) / n: (1 / n), [1 / (n-1)]: (n-2) / (n-1), (n-3) / (n-2): [1 / (n-2)], ..., 1 / 2: 1 / 2, wherein n is the number of the beam splitter prisms 32. In the present embodiment, the number of the beam splitter prisms 32 is 3, and the first reflector 31 is a beam splitter prism with an intensity ratio of the reflected light and the transmitted light of 1:0. The intensity ratios of the reflected light and the transmitted light of the beam splitter prism 32 are respectively: 0.75: 0.25, 0.33: 0.67, and 0.5: 0.5. When a parallel light beam enters the first beam splitter prism 32, 25% of the parallel light beams are transmitted through the hypotenuse surface of the first beam splitter prism 32 and emerge as a first sub-beam, 75% of the parallel light beams are reflected at the hypotenuse surface of the first beam splitter prism 32, and emerge to the second beam splitter prism 32 in a direction perpendicular to the incident direction of the parallel light beam; 33% of the parallel light beams out of the 75% are reflected at the hypotenuse surface of the second beam splitter prism 32 and emerge as a first sub-beam, 67% of the parallel light beams out of the 75% are transmitted through the hypotenuse surface of the second beam splitter prism 32 to the third beam splitter prism 32; 50% of the parallel light beams out of the 75% are reflected at the third beam splitter prism 32 and emerge as a first sub-beam, 50% of the parallel light beams out of the 75% are transmitted through the first beam splitter prism 32 to the first reflector 31, and the first reflector 31 reflects the remaining parallel light beams and emerges as a first sub-beam, and the light intensities of all first sub-beams are the same.

[0049] It is understood that in some other embodiments, see Figure 4b , when the incident direction of the parallel light beam is perpendicular to the emitting direction of the first sub-beam, the light intensity ratios of the reflected light and the transmitted light from the beam splitter prism 32 at the other end to the beam splitter prism 32 at one end of the first reflector 31 are respectively: (1 / n): (n-1) / n, (n-2) / (n-1): [1 / (n-1)], [1 / (n-2)]: (n-3) / (n-2), ..., 1 / 2: 1 / 2, where n is the number of the beam splitter prisms 32. For example, when the number of the beam splitter prisms 32 is 3, the light intensity ratios of the reflected light and the transmitted light from the beam splitter prism 32 at the other end to the beam splitter prism 32 at one end of the first reflector 31 are respectively: 0.25: 0.75, 0.67: 0.33, 0.5: 0.5.

[0050] Please also read Figure 5, the steering module 40 is arranged on one side of the emission direction of the first sub-beam of the beam splitting module 30, so as to receive all the first sub-beams. The steering module 40 includes a second reflector 41 and at least one steering prism 42. At least one steering prism 42 and a second reflector 41 are arranged in sequence, the second reflector 41 is located at one end, the steering prism 42 has light reflection and light transmission properties, and the second reflector 41 has light reflection properties. The length of the steering prism 42 and the second reflector 41 is the same as the length of the beam splitting module 30. The steering prism 42 located at the other end receives all the first sub-beams, and each first sub-beam is transmitted to the second reflector 41 by the steering prism 42 located at the other end. In the process of transmitting the first sub-beam, each steering prism 42 separates a second sub-beam from the first sub-beam and outputs it, and the second reflector 41 outputs the remaining part of the first sub-beam as a second sub-beam.

[0051] Among them, the second reflector 41 can be a reflecting plane mirror or a dichroic prism. When the second reflector 41 is a reflecting plane mirror, the second reflector 41 is parallel to the hypotenuse surface of the turning prism 42. When the second reflector 42 is a dichroic prism, the light intensity ratio of the reflected light and the transmitted light of the second reflector 42 is 1:0, so that the second reflector 11 achieves light reflection performance.

[0052] The steering prism 42 is a beam splitter prism, which is in a rectangular shape, and has a length equal to the sum of the lengths of all beam splitters 32 of the beam splitting module 30 and the first reflector 41. The hypotenuse surface is a surface formed by the hypotenuses of each surface of the steering prism 42.

[0053] Among them, the second reflector 41 and at least one turning prism 42 are arranged in parallel. For example, when the second reflector 41 is a reflecting plane mirror, the incident angle between the second reflector 41 and the hypotenuse of the turning prism 42 is 45 degrees, so that the second sub-beam reflected by the turning prism 42 is emitted at 45 degrees to the hypotenuse of the turning prism 42.

[0054] It is understandable that in some other embodiments, the incident angle of the parallel light beam incident on the hypotenuse surface of the turning prism 42 at the other end can be greater than or less than 45 degrees, as long as the hypotenuse surfaces of the turning prisms 42 and the second reflector 41 are parallel.

[0055] There are several turning prisms 42, and the number of turning prisms 42 can be freely set according to the required image size. Figure 2, when the first sub-beam enters the steering module 40, the intensity ratios of the reflected light and the transmitted light from the steering prism 42 at the other end to the steering prism 42 at one end of the second reflector 41 are respectively: (1 / m): (m-1) / m, (m-2) / (m-1): [1 / (m-1)], [1 / (m-2)]: (m-3) / (m-2), ..., 1 / 2:1 / 2, wherein m is the number of the steering prisms 42. In this embodiment, the number of the steering prisms 42 is 2, and the second reflector 41 is a beam splitter with an intensity ratio of the reflected light to the transmitted light of 1:0. The intensity ratios of the reflected light and the transmitted light of the steering prism 42 are respectively: 0.33:0.67, 0.5:0.5. When all the first sub-beams are incident on the first turning prism 42, 33% of the parallel beams are reflected from the hypotenuse surface of the first turning prism 42 and emitted as a second sub-beam, 67% of the parallel beams are transmitted through the hypotenuse surface of the first turning prism 42, and emitted to the second turning prism 42 in a direction perpendicular to the incident direction of the parallel beams; 50% of the first sub-beams out of the 67% are reflected from the hypotenuse surface of the second turning prism 42 and emitted as a first sub-beam, 50% of the parallel beams out of the 67% are transmitted through the hypotenuse surface of the second turning prism 42 to the second reflector 41, and the second reflector 41 reflects the remaining first sub-beams and emits them as a second sub-beam, and the light intensities of all the second sub-beams are the same.

[0056] In this embodiment, the laser lighting device 100 is provided with a laser light source 10, a beam expansion module 20, a beam splitting module 30 and a steering module 40. The laser light source 10 outputs a laser light source, the beam expansion module 20 converts the laser light source into a parallel light beam, the beam splitting module 30 splits the parallel light beam into a plurality of first sub-beams, and the steering module 40 splits each first sub-beam into a plurality of second sub-beams and outputs them, thereby outputting a large-aperture parallel light beam. There is no need to set up multiple light sources. Only one light source is needed to obtain a larger display image, which can meet the low cost requirement.

[0057] Embodiment 2

[0058] See also Figure 6 , is a schematic diagram of the structure of a holographic head-up display system provided by an embodiment of the present invention. Figure 6 As shown, the holographic head-up display system 200 includes a display module 210 and the laser lighting device 100 in the above embodiment. The second sub-beam output by the laser lighting device 100 illuminates the display module 210 to project an image display beam.

[0059] The structure of the laser lighting device 100 is the same as that in the above embodiment, and will not be described again here.

[0060] The display module 210 is a holographic display module, etc. In this embodiment, the display module 210 is a transmissive programmable holographic display device. The display module 210 receives the second sub-beam emitted by the laser illumination device 100, thereby displaying a holographic image.

[0061] In this embodiment, when the image display beam projected by the display module 210 is projected onto the display carrier, the eye can observe the image from the display carrier. The display carrier may be a wall, a ground, a glass, etc. When the holographic head-up display system 200 is applied to a vehicle, the display carrier is a windshield, which is used to receive the image display beam output by the display module 210 and reflect the image display beam to the human eye, so that the driver can see the image generated by the holographic head-up display system 200.

[0062] It is understandable that, in some other embodiments, the holographic head-up display system 200 further includes a Fresnel lens (not shown), which is disposed between the laser lighting device 100 and the display module 210. The Fresnel lens is used to receive the second sub-beam output by the laser lighting device 100, convert the second sub-beam into a uniform and parallel second sub-beam, and emit it.

[0063] It is understood that in some other embodiments, see Figure 7 and Figure 8 The holographic head-up display system 200 further includes a driving device 220 and a controller 230. The driving device 220 is connected to the laser lighting device 100. The controller 230 is connected to the driving device 220. The controller 230 is used to control the driving device 220 to drive the laser lighting device 100 to move. By setting the driving device 220 and the controller 230, the second sub-beam output by the laser lighting device 100 can be scanned on the display module 210, thereby avoiding long-term irradiation of the display module 210, saving energy consumption, and then using a relatively low-power laser lighting device 100 to obtain an image of sufficient brightness.

[0064] In this embodiment, the holographic head-up display system 200 reduces the cost of the entire holographic head-up display system 200 by disposing a low-cost laser lighting device 100. In addition, the holographic head-up display system 200 does not need to be provided with a curved reflector, and has a compact structure and a small size.

[0065] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the present invention; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present invention.

Claims

1. A laser lighting device, characterized in that: It includes a laser light source, a beam expansion module, a beam splitting module and a steering module; The laser light source is used to output a laser beam; The beam expansion module is used to receive the laser beam, convert the laser beam into a parallel beam and output it; The beam splitting module is arranged between the beam expansion module and the steering module, and the beam splitting module includes a first reflector and at least one beam splitting prism, the at least one beam splitting prism and the first reflector are arranged in a straight line, and the first reflector is located at one end, each of the beam splitting prisms has light reflection and light transmission properties, and the first reflector has light reflection property; The beam splitting module is used to receive the parallel light beam, and split the parallel light beam into a plurality of first sub-beams and output them; The steering module comprises a second reflector and at least one steering prism, wherein the at least one steering prism and the second reflector are arranged in sequence, the second reflector is located at one end, the steering prism has light reflection and light transmission properties, and the second reflector has light reflection property; The steering module is used for receiving all the first sub-beams, and dividing each of the first sub-beams into a plurality of second sub-beams and outputting the plurality of second sub-beams, wherein the output directions of all the second sub-beams are the same, and the transmission directions of the first sub-beams and the second sub-beams are different; Wherein, the beam expansion module comprises: a first lens and a second lens; The first lens is used to receive the laser beam output by the laser light source, expand the laser beam in a first direction and output it; The second lens is used to receive the laser beam output by the first lens, and expand and output the laser beam in a second direction to output the parallel beam, wherein the first direction is perpendicular to the second direction, and the laser beam outputs a rectangular parallel beam after expansion.

2. The laser lighting device according to claim 1, characterized in that: The shapes of the first lens and the second lens are both semi-cylindrical, the rectangular side surface of the first lens is opposite to the laser light source, the rectangular side surface of the second lens is opposite to the arcuate side surface of the first lens, and the long side of the rectangular side surface of the first lens is orthogonal to the long side of the rectangular side surface of the second lens.

3. The laser lighting device according to claim 1, characterized in that: The laser light source is a fiber-coupled laser light source, a diode laser light source or a solid laser light source.

4. The laser lighting device according to claim 1, characterized in that: The first reflector is located at one end, and the beam splitter prism located at the other end is used to receive the parallel light beam; The parallel light beam is transmitted to the first reflector by a beam splitting prism located at the other end. During the transmission of the parallel light beam, each beam splitting prism separates a first sub-beam from the parallel light beam and outputs it, and the first reflector outputs the remaining part of the parallel light beam as a first sub-beam.

5. The laser lighting device according to claim 4, characterized in that: The first reflector and at least one of the beam splitting prisms are arranged in parallel, and the incident angle of the parallel light beam incident on the hypotenuse surface of the beam splitting prism located at the other end is 45 degrees.

6. The laser lighting device according to claim 4, characterized in that: The number of the beam splitting prisms is several, The light intensity ratios of the reflected light and the transmitted light from the beam splitter prism at the other end to the beam splitter prism at one end of the first reflector are respectively: (n-1) / n:(1 / n), [1 / (n-1)]:(n-2) / (n-1), (n-3) / (n-2):[1 / (n-2)], ..., 1 / 2:1 / 2; Wherein, n is the number of beam splitting prisms.

7. The laser lighting device according to claim 1, characterized in that: The lengths of the steering prism and the second reflector are the same as the length of the beam splitting module. The steering prism located at the other end receives all the first sub-beams, and each of the first sub-beams is transmitted to the second reflector by the steering prism located at the other end. During the transmission of the first sub-beams, each steering prism separates a second sub-beam from the first sub-beam and outputs it, and the second reflector outputs the remaining part of the first sub-beam as a second sub-beam.

8. The laser lighting device according to claim 7, characterized in that: The number of the turning prisms is several, The light intensity ratios of the reflected light and the transmitted light from the turning prism at the other end to the turning prism at one end of the second reflector are respectively: (1 / m): (m-1) / m, (m-2) / (m-1): [1 / (m-1)], [1 / (m-2)]: (m-3) / (m-2), ..., 1 / 2: 1 / 2; Wherein, m is the number of beam splitting prisms.

9. A holographic head-up display system, characterized in that: It comprises the laser lighting device and display module as described in any one of claims 1 to 8, wherein the second sub-beam output by the laser lighting device illuminates the display module to project an image display beam.

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