A head-up display based on laser light source

Abstract

The present invention relates to the field of laser projection display technology, and discloses a head-up display based on a laser light source, comprising: a micro-projection optical machine for sending a laser display signal; an imaging film, arranged at the focal position of the micro-projection optical machine, for receiving the laser display signal sent by the micro-projection optical machine, the imaging film is sprayed with fluorescent powder, and the fluorescent powder will emit a fluorescent display signal after being excited by the laser display signal; a projection optical path system, and the projection optical path system is used to project the fluorescent display signal to the driver's eyes. In the above manner, the present invention can achieve the elimination of laser speckle, reduce the dependence on high temperature resistant fluorescent powder, and increase the life of the fluorescent powder and the brightness of the generated fluorescence.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of laser display technology, and in particular to a head-up display based on a laser light source. Background Art

[0002] Head-Up Display (HUD) is a projection optical system based on a graphic generator that is displayed on the front windshield of a car. It is used to display driving information such as car speed, rotation speed, fuel consumption and navigation information. The setting of the head-up display can present driving information in front of the driver's line of sight, avoiding possible traffic safety hazards when the driver lowers his head to view the dashboard information.

[0003] At present, in order to achieve high-brightness display, the pattern generator often uses a digital light processing projector (DLP) or a laser micro-projection machine. The laser micro-projection machine is a major development direction of head-up display due to its high brightness. However, due to the speckle effect of laser micro-projection display, the image quality is reduced.

[0004] The current mainstream technology is to use laser-excited fluorescent color wheel light source conversion technology to eliminate speckle. However, the fluorescent powder in the existing technology is generally used in the light source of the projection light machine. Due to the continuous high-power excitation of the laser beam on the single point position of the fluorescent powder, the temperature resistance of the fluorescent powder is affected, thereby affecting the life of the fluorescent powder and the brightness of the fluorescence generated.

[0005] Based on this, an embodiment of the present invention provides a head-up display based on a laser light source, which eliminates laser speckle and reduces dependence on high-temperature resistant phosphors, thereby increasing the life of the phosphors and the brightness of the generated fluorescence. Summary of the invention

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a head-up display based on a laser light source, which eliminates laser speckle and reduces the dependence on high-temperature resistant phosphors, thereby increasing the life of the phosphors and the brightness of the generated fluorescence.

[0007] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a head-up display based on a laser light source, comprising:

[0009] Micro-projection optical machine, used to send laser display signals;

[0010] An imaging film is arranged at the focal position of the micro-projection optical machine and is used to receive the laser display signal sent by the micro-projection optical machine. The imaging film is sprayed with fluorescent powder, and the fluorescent powder will emit a fluorescent display signal after being excited by the laser display signal;

[0011] A projection optical path system is used to project the fluorescent display signal to the driver's eyes.

[0012] In some embodiments, the projection optical path system includes: a reflector, a concave reflector, and a windshield;

[0013] The reflector is used to reflect the fluorescent display signal;

[0014] The concave reflector is used to reflect the fluorescent display signal from the reflector to the windshield;

[0015] The windshield is used to project the fluorescent display signal from the concave reflector to the eyes of the driver.

[0016] In some embodiments, the imaging film comprises:

[0017] A glass substrate, wherein the glass substrate is arranged on a side of the imaging film facing the micro-projection optical machine, the fluorescent powder is sprayed on the upper surface of the glass substrate, and the upper and lower surfaces of the glass substrate are both coated with anti-reflection films, and the anti-reflection films are used to increase the transmittance of laser display signals from the micro-projection optical machine.

[0018] In some embodiments, the phosphor is sprayed on the upper surface of the anti-reflection film.

[0019] In some embodiments, the upper surface of the glass substrate is further coated with a high-reflection film, and the high-reflection film is used to reflect the fluorescent display signal excited by the laser display signal.

[0020] In some embodiments, the imaging film further comprises:

[0021] A microprismatic film, wherein the microprismatic film is arranged on a side of the imaging film facing the projection optical path system, and the upper and lower surfaces of the microprismatic film are coated with a fluorescent high-transmittance film, and the fluorescent high-transmittance film is used to allow the fluorescent display signal to pass through the microprismatic film to reach the projection optical path system.

[0022] In some embodiments, the microprism angle of the microprismatic film is 90 degrees.

[0023] In some embodiments, the lower surface of the micro-prismatic film is coated with an anti-reflection film, and the anti-reflection film is used to prevent the laser display signal from passing through the imaging film.

[0024] In a second aspect, an embodiment of the present invention provides a head-up display based on a laser light source, comprising:

[0025] Micro-projection optical machine, used to send laser display signals;

[0026] An imaging film is arranged at the focal position of the micro-projection optical machine and is used to receive the laser display signal sent by the micro-projection optical machine. A side of the imaging film facing the micro-projection optical machine is sprayed with fluorescent powder. After the fluorescent powder is excited by the laser display signal, it will emit a fluorescent display signal.

[0027] A projection optical path system is used to project the fluorescent display signal to the driver's eyes.

[0028] In some embodiments, the imaging film includes a micro-prismatic film, and the fluorescent powder is sprayed on a side of the micro-prismatic film facing the micro-projection light engine.

[0029] 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 head-up display based on a laser light source, including: a micro-projection optical machine for sending a laser display signal; an imaging film, arranged at the focal position of the micro-projection optical machine, for receiving the laser display signal sent by the micro-projection optical machine, the imaging film is sprayed with fluorescent powder, and the fluorescent powder will emit a fluorescent display signal after being excited by the laser display signal; a projection optical path system, the projection optical path system is used to project the fluorescent display signal to the driver's eyes. In the above manner, the present invention can eliminate laser speckle, reduce the dependence on high temperature resistant fluorescent powder, and increase the life of the fluorescent powder and the brightness of the generated fluorescence. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments 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 the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0031] Figure 1 is a schematic structural diagram of a head-up display based on a laser light source provided by an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of an imaging film provided by a first embodiment of the present invention;

[0033] Figure 3 is a schematic structural diagram of an imaging film provided by a second embodiment of the present invention;

[0034] Figure 4 Schematic diagram of fluorescence emission of an imaging film provided by an embodiment of the present invention.

[0035] See also Figures 1 to 4 , 100, head-up display based on laser light source; 10, micro-projection optical machine; 20, imaging film; 21, micro-prismatic film; 22, phosphor; 23, glass substrate; 30, reflector; 40, concave reflector; 50, windshield; 60, driver's eyes. DETAILED DESCRIPTION

[0036] 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 the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0037] 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 this specification and 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.

[0038] Example 1

[0039] See also Figure 1 , Figure 1 is a schematic structural diagram of a head-up display based on a laser light source provided by an embodiment of the present invention;

[0040] like Figure 1 As shown, the laser light source-based head-up display 100 includes: a micro-projection optical machine 10, an imaging film 20, a reflector 30, a concave reflector 40, a windshield 50 and a driver's eyes 60. The reflector 30, the concave reflector 40 and the windshield 50 constitute a projection optical path system.

[0041] Wherein, the micro-projection optical machine 10 is used to provide a laser light source. The micro-projection optical machine 10 is a laser micro-projection optical machine. The use of a laser micro-projection optical machine can provide higher brightness than an LED, and has the advantages of good monochromaticity and coherence. Due to the use of lasers, harmful striped spots will be generated when the interfaces inside the micro-projection optical machine 10 are reflected, generally referred to as speckles. The reason for the generation of speckles is that the laser has strong monochromaticity and coherence, and the phases in time and space are superimposed on each other, so the coherence of the laser must be eliminated. Specifically, the micro-projection optical machine 10 may include a laser light source assembly, and the laser light source assembly is composed of at least one laser. Preferably, the laser light source assembly includes a relatively small semiconductor laser, and the laser light source assembly is used to provide a laser light source. Wherein, the laser light source may be a red laser light source, a blue laser light source, a green laser light source, and the like. Preferably, the laser light source is a DLP violet laser light source, and the micro-projection optical machine 10 is a digital light processing projector (Digital Light Processing, DLP) or a laser micro-projection optical machine. The micro-projection optical engine 10 can generate a purple laser display signal after being controlled by the image source signal.

[0042] The imaging film 20 is arranged at the focal position of the micro-projection optical machine 10, and the imaging film 20 is used to receive the laser light source generated by the micro-projection optical machine 10, wherein the laser light source can be a red laser light source, a blue laser light source, a green laser light source, and the like. Preferably, the laser light source is a DLP violet laser light source, and the micro-projection optical machine 10 sends a violet laser display signal to the imaging film 20, and the imaging film 20 is sprayed with fluorescent powder, and the imaging film 20 is used to convert the violet laser display signal into a fluorescent display signal. Specifically, after the fluorescent powder on the imaging film 20 is excited by the violet laser display signal, it will emit a fluorescent display signal. By focusing the micro-projection optical machine 10, the imaging film 20 can be located at the focal position of the micro-projection optical machine 10.

[0043] Because in the optical path of the head-up display, only light at a small angle from the image source image generator can be used, and when the phosphor emits light, it emits fluorescence of the same brightness in all directions and is isotropic. In order to maximize the use of the fluorescence emitted by the phosphor, an imaging film can be designed to achieve monochrome high-brightness characteristics.

[0044] Please refer to Figure 2 , Figure 2 is a schematic structural diagram of an imaging film provided by a first embodiment of the present invention;

[0045] like Figure 2As shown, the imaging film 20 includes: a micro-prism film 21, a phosphor 22 and a glass substrate 23. Figure 1 ,

[0046] Wherein, the micro-prismatic film 21 is arranged on the side of the imaging film 20 facing the projection optical path system. Specifically, the micro-prismatic film 21 is arranged on the side of the imaging film 20 facing the reflector. The upper and lower surfaces of the micro-prismatic film 21 are coated with fluorescent high-transmittance films, and the fluorescent high-transmittance films are used to enable the fluorescent display signal to pass through the micro-prismatic film 21 to reach the projection optical path system. Specifically, the fluorescent high-transmittance film is used to enable the fluorescent display signal to pass through the micro-prismatic film 21 to reach the reflector. Specifically, the fluorescent high-transmittance film can be a transparent film, and the anti-reflection film is made of a transparent material doped with nanoparticles, and the transparent material refers to a material that is transparent to the visible light range. Preferably, the transparent material can be made of one of glass, organic glass, acrylic, PMMA, PC, PET and other materials, or the fluorescent high-transmittance film can be a high-transmittance PVC fluorescent film, a high-transmittance fluorescent quantitative PCR sealing film, and the like.

[0047] The microprism angle of the microprism film 21 is 90 degrees. By setting the microprism angle to 90 degrees, the microprism film 21 can transform the fluorescence emitted by the phosphor 22 into a small-angle beam at the center, so as to increase the utilization rate of the fluorescence emitted by the phosphor 22.

[0048] The lower surface of the micro-prismatic film 21 is coated with an anti-reflection film (not shown), that is, the anti-reflection film is coated on the side of the micro-prismatic film 21 facing the phosphor 22, and the anti-reflection film is used to enhance the reflective effect, prevent the laser display signal from passing through the imaging film 20, and prevent the laser from causing damage to the driver's eyes. Specifically, the anti-reflection film can be multi-layered, and the multi-layer anti-reflection film can better reduce the amount of light transmission and enhance the reflective effect.

[0049] It can be understood that the positions of the fluorescent high-transmittance film and the anti-reflection film on the lower surface of the microprismatic film 21 can be arbitrary, that is, the fluorescent high-transmittance film can be located on the outside of the anti-reflection film, and the fluorescent high-transmittance film wraps the anti-reflection film; or the anti-reflection film can be located on the outside of the fluorescent high-transmittance film, and the anti-reflection film wraps the fluorescent high-transmittance film.

[0050] The phosphor 22 is sprayed on the imaging film 20. Specifically, the phosphor 22 is sprayed between the micro-prismatic film 21 and the glass substrate 23 of the imaging film 20, and specifically, the phosphor 22 is sprayed on the upper surface of the glass substrate 23 of the imaging film 20. It can be understood that the phosphor 22 has a certain thickness, so after the phosphor 22 is sprayed on the upper surface of the glass substrate 23 of the imaging film 20, a layer of phosphor film will be formed.

[0051] The glass substrate 23 is arranged on the side of the imaging film 20 facing the micro-projection optical machine, the fluorescent powder 22 is sprayed on the upper surface of the glass substrate 23, and the upper and lower surfaces of the glass substrate 23 are coated with an anti-reflection film (not shown), and the anti-reflection film is used to increase the transmittance of the laser display signal from the micro-projection optical machine.

[0052] Specifically, the anti-reflection film is a transparent film, and the anti-reflection film is made of transparent material mixed with nanoparticles, and the transparent material refers to being transparent to the visible light range. Preferably, the transparent material can be made of one of the materials such as glass, organic glass, acrylic, PMMA, PC, PET, etc., and a certain proportion of nanoparticles are mixed in the production process. The mixed nanoparticles are composed of at least three nanoparticles of different sizes, each nanoparticle has a fixed resonant Rayleigh scattering wavelength, and the wavelength of various nanoparticles is the same as the luminous wavelength of the laser light source and corresponds one to one. Adjusting the density of each nanoparticle in the anti-reflection film can make each laser form a bright picture on the screen. Among them, the nanoparticles can be composed of a non-metallic material to form a core, and the outer layer is composed of nanoparticles wrapped with a metal layer. The selected material and particle size are matched to the resonant Rayleigh scattering wavelength of the laser light source used according to the wavelength of the laser light source used to ensure that the nanoparticles produce effective resonant Rayleigh scattering to the laser light source.

[0053] It can be understood that the anti-reflection film is coated on the upper and lower surfaces of the glass substrate 23. In order to enhance the transmittance of the laser display signal from the micro-projection optical machine, the phosphor 22 should be sprayed on the anti-reflection film. Specifically, the phosphor 22 is sprayed on the upper surface of the anti-reflection film, that is, the side of the anti-reflection film facing the micro-prismatic film 21.

[0054] Specifically, the upper surface of the glass substrate 23 is also coated with a high-reflection film (not shown), and the high-reflection film is used to reflect the fluorescent display signal excited by the laser display signal. Specifically, the high-reflection film, also known as a high-reflection film, is an optical element that reflects most or almost all of the incident light energy back in optical thin films. A thin film with a thickness of d is coated on the optical device so that the optical path difference of two beams of reflected light (or transmitted light) with equal intensity meets the interference enhancement and attenuation conditions, which can improve the transmittance or reflectivity of the optical device. A film that increases the reflectivity (i.e., the optical path difference of the reflected light) is a high-reflection film. High-reflection films are often used on the lenses of optical instruments. Since the intensities of two adjacent beams of light are not equal, a multi-layer film is often used in practice to make the reflectivity of the high-reflection film reach more than 99%. Some reflectors require a sufficiently high reflectivity, but have no requirements for the absorptivity and transmittance of the film. They can use a simple metal film to meet the common requirements. In some applications, if the required reflectivity is higher than the value that the metal film can achieve, an additional dielectric layer can be plated on the metal film to improve their reflectivity. Some reflectors require not only a large reflectivity, but also a minimum absorptivity. Such reflectors mostly use all-medium multilayer reflective films. Due to the different wavelengths of fluorescence and laser, different wavelengths can be plated with anti-reflection films and anti-reflection films at the same time. Since the fluorescent powder emits fluorescence of equal intensity in all directions, in order to collect the fluorescence emitted from the direction of the glass substrate, a high-reflection film that can reflect fluorescence is plated on the upper surface of the glass substrate, so that the fluorescence is reflected into the microprism film, and then projected and displayed. Among them, the high-reflection film includes a metal high-reflection film and a dielectric high-reflection film. The metal of the metal high-reflection film can include gold, silver, copper, aluminum, and the like. The medium of the dielectric high-reflection film can be an ultraviolet band, an infrared band, or a visible band. In an embodiment of the present invention, the medium of the high-reflection film is an ultraviolet band.

[0055] It can be understood that the upper surface of the glass substrate 23 is coated with an anti-reflection film and a high-reflection film, and the phosphor 22 is sprayed on the upper surface of the anti-reflection film or the high-reflection film. The positional relationship between the anti-reflection film and the high-reflection film can be arbitrary, that is, the anti-reflection film can be located on the outside of the high-reflection film, and the anti-reflection film wraps the high-reflection film, or the high-reflection film can be located on the outside of the anti-reflection film, and the high-reflection film wraps the anti-reflection film.

[0056] Under the action of the micro-prismatic film 21, the imaging film 20 can collect the light emitted by the phosphor 22 at a large angle. Figure 4 , Figure 4 is a schematic diagram of fluorescence emission of an imaging film provided by an embodiment of the present invention, such as Figure 4As shown, taking a light-emitting point O of the fluorescent powder as an example, the fluorescence emitted by the luminous O can be transformed into a small-angle light beam as the center at the position shown by the dotted lines on both sides after passing through the microprism film 21, which can increase the utilization rate of the fluorescent display signal. Moreover, when the fluorescent powder emits the fluorescent display signal downward, the fluorescent display signal can be reflected by the glass substrate, which further increases the utilization rate of the fluorescence and is beneficial to improving the imaging efficiency.

[0057] The reflector 30 is used to reflect the fluorescent display signal. Specifically, the reflector 30 is disposed on the side of the imaging film facing away from the micro-projection optical machine, and is used to reflect the fluorescent display signal emitted by the fluorescent powder of the imaging film 20, and the fluorescent display signal is generated by the fluorescent powder being stimulated by the laser display signal emitted by the micro-projection optical machine 10. In the embodiment of the present invention, the reflector 30 is a plane reflector.

[0058] Among them, the concave reflector 40 is set in the direction of the reflected light of the reflector 30, that is, the direction of the fluorescent display signal. The concave reflector 40 is used to change the light reflected by the reflector 30, that is, change the direction of the fluorescent display signal, and display the fluorescent display signal on the windshield.

[0059] The windshield 50 is used to receive light, that is, to receive the fluorescent display signal. Specifically, the inner surface of the windshield 50 is plated or attached with a thin film with a high surface reflectivity, which is used to reflect light to the driver's eyes 60. Specifically, a holographic optical film is provided on the inner side of the windshield 50. The light is reflected on the holographic optical film through the optical diffraction effect, and a holographic stereoscopic image is presented in the distance, achieving the effect of combining virtual indication information with the actual road, and the driver can see the effect of augmented reality through the line of sight.

[0060] The reflector 30 , the concave reflector 40 and the windshield 50 form a projection optical path system, and the projection optical path system is used to project the fluorescent display signal to the driver's eyes 60 .

[0061] In an embodiment of the present invention, a head-up display based on a laser light source is provided, comprising: a micro-projection optical machine for sending a laser display signal; an imaging film, arranged at the focal position of the micro-projection optical machine, for receiving the laser display signal sent by the micro-projection optical machine, the imaging film is sprayed with fluorescent powder, and the fluorescent powder will emit a fluorescent display signal after being excited by the laser display signal; a projection optical path system, and the projection optical path system is used to project the fluorescent display signal to the driver's eyes. In the above manner, the present invention can eliminate laser speckle, reduce the dependence on high temperature resistant fluorescent powder, and increase the life of the fluorescent powder and the brightness of the generated fluorescence.

[0062] Example 2

[0063] See also Figure 1 , Figure 1 is a schematic structural diagram of a head-up display based on a laser light source provided by an embodiment of the present invention;

[0064] like Figure 1 As shown, the laser light source-based head-up display 100 includes: a micro-projection optical machine 10, an imaging film 20, a reflector 30, a concave reflector 40, a windshield 50 and a driver's eyes 60. The reflector 30, the concave reflector 40 and the windshield 50 constitute a projection optical path system.

[0065] Among them, the micro-projection optical machine 10 is used to provide a laser light source. The micro-projection optical machine 10 is a laser micro-projection optical machine. The use of a laser micro-projection optical machine can provide higher brightness than LEDs, and has the advantages of good monochromaticity and coherence. Due to the use of lasers, harmful striped spots will be generated when reflecting at various interfaces inside the micro-projection optical machine, generally referred to as speckles. The reason for the generation of speckles is that the laser has strong monochromaticity and coherence, and the phases in time and space are superimposed on each other, so the coherence of the laser must be eliminated. Specifically, the micro-projection optical machine 10 may include a laser light source assembly, and the laser light source assembly is composed of at least one laser. Preferably, the laser light source assembly includes a relatively small semiconductor laser, and the laser light source assembly is used to provide a laser light source. Preferably, the laser light source is a DLP violet laser light source, and the micro-projection optical machine is a digital light processing projector (Digital Light Processing, DLP) or a laser micro-projection optical machine. After the micro-projection optical machine 10 is controlled by an image source signal, it can generate a violet laser display signal.

[0066] The imaging film 20 is arranged at the focal position of the micro-projection optical machine 10. The imaging film 20 is used to receive the laser light source generated by the micro-projection optical machine 10. Specifically, the laser light source is a DLP laser light source. The micro-projection optical machine 10 sends a laser display signal to the imaging film 20. The imaging film 20 is sprayed with fluorescent powder. The imaging film 20 is used to convert the laser display signal into a fluorescent display signal. Specifically, after the fluorescent powder on the imaging film 20 is excited by the laser display signal, it will emit a fluorescent display signal. Specifically, after the fluorescent powder on the imaging film 20 is excited by the laser display signal, it will emit a fluorescent display signal. By focusing the micro-projection optical machine 10, the imaging film 20 can be located at the focal position of the micro-projection optical machine 10.

[0067] Because in the optical path of the head-up display, only light at a small angle from the image source image generator can be used, and when the phosphor emits light, it emits fluorescence of the same brightness in all directions and is isotropic. In order to maximize the use of the fluorescence emitted by the phosphor, an imaging film can be designed to achieve monochrome high-brightness characteristics.

[0068] Please refer to Figure 3 , Figure 3 is a schematic structural diagram of an imaging film provided by a second embodiment of the present invention;

[0069] like Figure 3 As shown, the imaging film 20 includes: a micro-prism film 21 and a phosphor 22. Figure 1 ,

[0070] The fluorescent powder 22 is sprayed on the lower surface of the micro-prismatic film 21 , that is, the fluorescent powder 22 is sprayed on the side of the micro-prismatic film 21 facing the micro-projection optical machine 20 .

[0071] Wherein, the micro-prismatic film 21 is arranged on the side of the imaging film 20 facing the projection optical path system. Specifically, the micro-prismatic film 21 is arranged on the side of the imaging film 20 facing the reflector. The upper and lower surfaces of the micro-prismatic film 21 are coated with fluorescent high-transmittance films, and the fluorescent high-transmittance films are used to enable the fluorescent display signal to pass through the micro-prismatic film 21 to reach the projection optical path system. Specifically, the fluorescent high-transmittance film is used to enable the fluorescent display signal to pass through the micro-prismatic film 21 to reach the reflector. Specifically, the fluorescent high-transmittance film can be a transparent film, and the anti-reflection film is made of a transparent material doped with nanoparticles, and the transparent material refers to a material that is transparent to the visible light range. Preferably, the transparent material can be made of one of glass, organic glass, acrylic, PMMA, PC, PET and other materials, or the fluorescent high-transmittance film can be a high-transmittance PVC fluorescent film, a high-transmittance fluorescent quantitative PCR sealing film, and the like.

[0072] The microprism angle of the microprism film 21 is 90 degrees. By setting the microprism angle to 90 degrees, the microprism film 21 can transform the fluorescence emitted by the phosphor 22 into a small-angle beam at the center, so as to increase the utilization rate of the fluorescence emitted by the phosphor 22.

[0073] The lower surface of the micro-prismatic film 21 is coated with an anti-reflection film (not shown), that is, the anti-reflection film is coated on the side of the micro-prismatic film 21 facing the phosphor 22, and the anti-reflection film is used to enhance the reflective effect, prevent the laser display signal from passing through the imaging film 20, and prevent the laser from causing damage to the driver's eyes. Specifically, the anti-reflection film can be multi-layered, and the multi-layer anti-reflection film can better reduce the amount of light transmission and enhance the reflective effect.

[0074] It can be understood that the positions of the fluorescent high-transmittance film and the anti-reflection film on the lower surface of the microprismatic film 21 can be arbitrary, that is, the fluorescent high-transmittance film can be located on the outside of the anti-reflection film, and the fluorescent high-transmittance film wraps the anti-reflection film; or the anti-reflection film can be located on the outside of the fluorescent high-transmittance film, and the anti-reflection film wraps the fluorescent high-transmittance film.

[0075] The phosphor 22 is sprayed on the imaging film 20. Specifically, the phosphor 22 is sprayed on the lower surface of the micro-prismatic film 21. It is understandable that the phosphor 22 has a certain thickness, so after the phosphor 22 is sprayed on the lower surface of the micro-prismatic film 21 of the imaging film 20, a layer of phosphor film will be formed. Since the glass substrate is reduced, the imaging film 20 only retains the micro-prismatic film 21 and the phosphor 22. By spraying the phosphor 22 on the back of the imaging film 20, the thickness of the imaging film 20 is reduced, and the clarity of the image displayed by the imaging film 20 is increased.

[0076] Under the action of the micro-prismatic film 21, the imaging film 20 can collect the light emitted by the phosphor 22 at a large angle. Figure 4 , Figure 4 is a schematic diagram of fluorescence emission of an imaging film provided by an embodiment of the present invention, such as Figure 4 As shown, taking a light-emitting point O of the fluorescent powder as an example, the fluorescence emitted by the luminous O can be transformed into a small-angle light beam at the center at the position shown by the dotted lines on both sides after passing through the microprism film 21, which can increase the utilization rate of the fluorescent display signal and help improve the imaging efficiency.

[0077] The reflector 30 is used to reflect the fluorescent display signal. Specifically, the reflector 30 is disposed on the side of the imaging film facing away from the micro-projection optical machine, and is used to reflect the fluorescent display signal emitted by the fluorescent powder of the imaging film 20, and the fluorescent display signal is generated by the fluorescent powder being stimulated by the laser display signal emitted by the micro-projection optical machine 10. In the embodiment of the present invention, the reflector 30 is a plane reflector.

[0078] Among them, the concave reflector 40 is set in the direction of the reflected light of the reflector 30, that is, the direction of the fluorescent display signal. The concave reflector 40 is used to change the light reflected by the reflector 30, that is, change the direction of the fluorescent display signal, and display the fluorescent display signal on the windshield.

[0079] The windshield 50 is used to receive light, that is, to receive the fluorescent display signal. Specifically, the inner surface of the windshield 50 is plated or attached with a thin film with a high surface reflectivity, which is used to reflect light to the driver's eyes. Specifically, a holographic optical film is provided on the inner side of the windshield 50. The light is reflected on the holographic optical film through the optical diffraction effect, and a holographic stereoscopic image is presented in the distance, achieving the effect of combining virtual indication information with the actual road, and the driver can see the effect of augmented reality through the line of sight.

[0080] The reflector 30 , the concave reflector 40 and the windshield 50 form a projection optical path system, and the projection optical path system is used to project the fluorescent display signal to the driver's eyes 60 .

[0081] In an embodiment of the present invention, a head-up display based on a laser light source is provided, comprising: a micro-projection optical machine for sending a laser display signal; an imaging film, arranged at the focal position of the micro-projection optical machine, for receiving the laser display signal sent by the micro-projection optical machine, the imaging film having a side facing the micro-projection optical machine sprayed with fluorescent powder, the fluorescent powder will emit a fluorescent display signal after being excited by the laser display signal; and a projection optical path system, the projection optical path system is used to project the fluorescent display signal to the driver's eyes. By directly spraying the fluorescent powder on the back of the imaging film, the thickness of the imaging film is reduced, the clarity of the image displayed by the imaging film is increased, the laser speckle is eliminated, and the dependence on high temperature resistant fluorescent powder is reduced, thereby increasing the life of the fluorescent powder and the brightness of the generated fluorescence.

[0082] 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 head-up display based on a laser light source, characterized in that: include: Micro-projection optical machine, used to send laser display signals; An imaging film is arranged at the focal position of the micro-projection optical machine and is used to receive the laser display signal sent by the micro-projection optical machine. The imaging film is sprayed with fluorescent powder, and the fluorescent powder will emit a fluorescent display signal after being excited by the laser display signal; A projection optical system, the projection optical system is used to project the fluorescent display signal to the driver's eyes; The imaging film further comprises: A micro-prismatic film, wherein the micro-prismatic film is disposed on a side of the imaging film facing the projection optical path system; A glass substrate, the glass substrate is arranged on a side of the imaging film facing the micro-projection optical machine, the glass substrate comprises an upper surface and a lower surface, the upper surface of the glass substrate is a side facing the projection optical path system, and the lower surface of the glass substrate is a side facing the micro-projection optical machine, the phosphor is located on the upper surface of the glass substrate, and the upper and lower surfaces of the glass substrate are both coated with an anti-reflection film, and the anti-reflection film is used to increase the transmittance of a laser display signal from the micro-projection optical machine; The anti-reflection film includes at least three nanoparticles of different sizes, each nanoparticle has a fixed resonant Rayleigh scattering wavelength, and the wavelength of each nanoparticle is the same as and corresponds to the emission wavelength of the laser light source; each nanoparticle is adjusted to a different density in the anti-reflection film, and each nanoparticle corresponds to its density in the anti-reflection film, so that each laser can form a bright picture on the screen, wherein the nanoparticles are composed of a core composed of a non-metallic material and an outer layer of nanoparticles wrapped with a metal layer, and the material and particle size of the nanoparticles are matched with the resonant Rayleigh scattering wavelength of the laser light source used according to the wavelength of the laser light source used, so as to ensure that the nanoparticles produce effective resonant Rayleigh scattering of the laser light source.

2. The head-up display according to claim 1, characterized in that: The projection optical path system comprises: a reflector, a concave reflector and a windshield; The reflector is used to reflect the fluorescent display signal; The concave reflector is used to reflect the fluorescent display signal from the reflector to the windshield; The windshield is used to project the fluorescent display signal from the concave reflector to the eyes of the driver.

3. The head-up display according to claim 1, characterized in that: The anti-reflection film includes an upper surface and a lower surface, wherein the upper surface of the anti-reflection film is the side of the anti-reflection film facing the microprismatic film, and the lower surface of the anti-reflection film is the side of the anti-reflection film close to the glass substrate; the phosphor is sprayed on the upper surface of the anti-reflection film.

4. The head-up display according to claim 1, characterized in that: The upper surface of the glass substrate is also coated with a high-reflection film, and the high-reflection film is used to reflect the fluorescent display signal excited by the laser display signal.

5. The head-up display according to claim 1, characterized in that: The upper surface and the lower surface of the micro-prismatic film are both coated with a fluorescent high-transmittance film, and the fluorescent high-transmittance film is used to enable the fluorescent display signal to pass through the micro-prismatic film to reach the projection optical path system.

6. The head-up display according to claim 5, characterized in that: The micro-prism angle of the micro-prismatic film is 90 degrees.

7. The head-up display according to claim 5 or 6, characterized in that: The lower surface of the micro-prism film is coated with an anti-reflection film, and the anti-reflection film is used to prevent the laser display signal from passing through the imaging film.

8. A head-up display based on a laser light source, characterized in that: include: Micro-projection optical machine, used to send laser display signals; An imaging film is arranged at the focal position of the micro-projection optical machine and is used to receive the laser display signal sent by the micro-projection optical machine. A side of the imaging film facing the micro-projection optical machine is sprayed with fluorescent powder. After the fluorescent powder is excited by the laser display signal, it will emit a fluorescent display signal. The imaging film comprises a micro-prismatic film, the fluorescent powder is sprayed on a side of the micro-prismatic film facing the micro-projection optical machine, wherein the micro-prism angle of the micro-prismatic film is 90 degrees; the micro-prismatic film comprises an upper surface and a lower surface, the upper surface of the micro-prismatic film is provided with micro-prisms, the lower surface of the micro-prismatic film is a plane, the upper surface of the micro-prismatic film is close to the projection optical path system, the lower surface of the micro-prismatic film is close to the micro-projection optical machine, and the fluorescent powder is sprayed on the lower surface of the micro-prismatic film; the lower surface of the micro-prismatic film is coated with an anti-reflection film, the anti-reflection film is coated on a side of the micro-prismatic film facing the fluorescent powder, and the anti-reflection film is used to enhance the reflective effect and prevent the laser display signal from passing through the imaging film; A projection optical path system is used to project the fluorescent display signal to the driver's eyes.

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