CN110543016A - Head-up display based on laser light source - Google Patents
Head-up display based on laser light source Download PDFInfo
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- CN110543016A CN110543016A CN201810549447.2A CN201810549447A CN110543016A CN 110543016 A CN110543016 A CN 110543016A CN 201810549447 A CN201810549447 A CN 201810549447A CN 110543016 A CN110543016 A CN 110543016A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- Optics & Photonics (AREA)
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- Transforming Electric Information Into Light Information (AREA)
Abstract
The invention relates to the technical field of laser projection display, and discloses a head-up display based on a laser light source, which comprises: the micro-projection optical machine is used for sending laser display signals; the imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving the laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on the imaging film, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal; a projection optical path system for projecting the fluorescent display signal to a driver's eye. By adopting the mode, the invention can eliminate laser speckles, reduce the dependence on high-temperature-resistant fluorescent powder, prolong the service life of the fluorescent powder and improve the brightness of generated fluorescence.
Description
Technical Field
the embodiment of the invention relates to the technical field of laser display, in particular to a head-up display based on a laser light source.
Background
the Head-Up Display (HUD) is a projection optical system based on a graphic generator and displayed on the front windshield of an automobile and used for displaying driving information such as automobile speed, rotating speed, oil consumption, navigation information and the like, and the driving information can be presented in front of the sight of a driver by the arrangement of the Head-Up Display, so that potential traffic safety hazards which may exist when the driver looks at instrument panel information with a Head down can be avoided.
at present, in order to realize high-brightness display, a Digital Light Processing (DLP) projector or a laser micro-projector is often used as a graphic generator, and the laser micro-projector is a main development direction of the head-up display due to its high brightness. But the laser micro-projection display has a speckle effect, so that the image quality is reduced.
The current mainstream technology is to adopt a light source conversion technology of exciting a fluorescent powder color wheel by laser to eliminate speckles, however, the fluorescent powder in the prior art is generally used at a light source of a projection light machine, and due to continuous high-power excitation of a laser beam to a single-point position of the fluorescent powder, the temperature resistance of the fluorescent powder is affected, so that the service life of the fluorescent powder and the brightness of generated fluorescence are affected.
Based on the above, the embodiment of the invention provides a laser light source-based head-up display, which can eliminate laser speckles, reduce the dependence on high-temperature-resistant fluorescent powder, prolong the service life of the fluorescent powder and improve the brightness of generated fluorescence.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a head-up display based on a laser light source, which eliminates laser speckles, reduces the dependence on high temperature resistant phosphor, and improves the lifetime of the phosphor and the brightness of generated fluorescence.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
In a first aspect, an embodiment of the present invention provides a head up display based on a laser light source, including:
the micro-projection optical machine is used for sending laser display signals;
The imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving the laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on the imaging film, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal;
a projection optical path system for projecting the fluorescent display signal to a driver's eye.
in some embodiments, the projection light path system comprises: a reflector, a concave reflector and a windshield;
The reflector is used for reflecting the fluorescent display signal;
the concave reflector is used for reflecting the fluorescent display signal from the reflector to the windshield;
The windshield is used for projecting the fluorescent display signal from the concave reflector to the eyes of the driver.
In some embodiments, the imaging film comprises:
the glass substrate is arranged on one surface, facing the micro-projection light machine, of the imaging film, the fluorescent powder is sprayed on the upper surface of the glass substrate, antireflection films are plated on the upper surface and the lower surface of the glass substrate, and the antireflection films are used for antireflection of laser display signals from the micro-projection light machine.
In some embodiments, the phosphor is spray coated on the upper surface of the antireflective film.
In some embodiments, the upper surface of the glass substrate is further coated with a high reflective film for reflecting fluorescent display signals excited by laser display signals.
in some embodiments, the imaging film further comprises:
The micro-prism film is arranged on one surface, facing the projection light path system, of the imaging film, the upper surface and the lower surface of the micro-prism film are plated with fluorescent high-transmittance films, and the fluorescent high-transmittance films are used for enabling fluorescent display signals to penetrate through the micro-prism film to reach the projection light path system.
In some embodiments, the microprism angle of the microprism film is 90 degrees.
In some embodiments, the lower surface of the microprism film is coated with a reflection enhancement film for preventing the laser display signal from transmitting through the imaging film.
in a second aspect, an embodiment of the present invention provides a head up display based on a laser light source, including:
The micro-projection optical machine is used for sending laser display signals;
The imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving a laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on one surface of the imaging film facing the micro-projection optical machine, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal;
A projection optical path system for projecting the fluorescent display signal to a driver's eye.
In some embodiments, the imaging film comprises a micro-prism film, and the fluorescent powder is sprayed on one side of the micro-prism film facing the micro-projector.
The beneficial effects of the embodiment of the invention are as follows: in contrast to the prior art, an embodiment of the present invention provides a head-up display based on a laser light source, including: the micro-projection optical machine is used for sending laser display signals; the imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving the laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on the imaging film, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal; a projection optical path system for projecting the fluorescent display signal to a driver's eye. By adopting the mode, the invention can eliminate laser speckles, reduce the dependence on high-temperature-resistant fluorescent powder, prolong the service life of the fluorescent powder and improve the brightness of generated fluorescence.
Drawings
one or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural diagram of a head-up display based on a laser light source according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an imaging film according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a structure of an imaging film according to a second embodiment of the invention;
FIG. 4 is a schematic illustration of fluorescence emission from an imaging film provided by an embodiment of the invention.
referring to fig. 1-4, 100, a laser light source based heads up display; 10. a micro-projector; 20. an imaging film; 21. a microprism film; 22. fluorescent powder; 23. a glass substrate; 30. a mirror; 40. a concave reflector; 50. a windshield; 60. the eyes of the driver.
Detailed Description
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of a head-up display based on a laser light source according to an embodiment of the present invention;
As shown in fig. 1, the laser light source-based head up display 100 includes: a micro-projector 10, an imaging film 20, a mirror 30, a concave mirror 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.
The micro-projection optical machine 10 is used for providing a laser light source, the micro-projection optical machine 10 is a laser micro-projection optical machine, and the 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 laser light, unwanted striped spots, commonly referred to as speckle, are generated when reflected from various interfaces within the micro-projector 10. The reason why the speckle is generated is that the laser has strong monochromaticity and coherence, and the phases in time and space are overlapped with each other, so that the coherence of the laser must be eliminated. Specifically, the micro-projector 10 may include a laser source assembly, which is composed of at least one laser. Preferably, the laser light source assembly comprises a semiconductor laser with a small volume, and the laser light source assembly is used for providing 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 so on. Preferably, the laser Light source is a DLP violet laser Light source, and the micro-projector 10 is a Digital Light Processing (DLP) projector or a laser micro-projector. The micro-projector 10 can generate violet laser display signals after being controlled by image source signals.
The imaging film 20 is disposed at a focal point of the micro-projector 10, and the imaging film 20 is configured to receive a laser light source generated by the micro-projector 10, where the laser light source may be a red laser light source, a blue laser light source, a green laser light source, and so on. Preferably, the laser light source is a DLP violet laser light source, the micro-projector 10 displays signals to the imaging film 20 by sending violet laser, the imaging film 20 is sprayed with phosphor, and the imaging film 20 is used for converting the violet laser display signals into fluorescent display signals. Specifically, the fluorescent powder on the imaging film 20 will emit a fluorescent display signal after being excited by the violet laser display signal. By focusing the micro-projector 10, the imaging film 20 can be located at the focal position of the micro-projector 10.
In the light path of the head-up display, only light with a small angle can be utilized by the light from the image source image generator, and when the fluorescent powder emits light, the fluorescent powder emits fluorescent light with the same brightness in all directions and has isotropy.
Referring to fig. 2 again, fig. 2 is a schematic structural diagram of an imaging film according to a first embodiment of the invention;
As shown in fig. 2, the imaging film 20 includes: microprism film 21, phosphor 22 and glass substrate 23. In conjunction with figure 1 again, the following description of the preferred embodiment,
the micro prism film 21 is arranged on one surface of the imaging film 20 facing the projection optical path system, specifically, the micro prism film 21 is arranged on one surface of the imaging film 20 facing the reflector, the upper surface and the lower surface of the micro prism film 21 are both plated with a fluorescent high-transmittance film, and the fluorescent high-transmittance film is used for enabling a fluorescent display signal to penetrate through the micro prism film 21 to reach the projection optical path system. Specifically, the fluorescent high-transmittance film is used to enable a fluorescent display signal to reach the reflecting mirror through the microprism film 21. Specifically, the fluorescent high-transmittance film may be a transparent film, the antireflection film is made of transparent materials doped with nanoparticles, and the transparent materials are transparent in a visible light range. Preferably, the transparent material may be made of one of glass, organic glass, acryl, PMMA, PC, PET, or the like, or the fluorescent high-transmittance film may be a high-transmittance PVC fluorescent film, a high-transmittance fluorescent quantitative PCR sealing plate film, and the like.
Wherein, the microprism angle of the microprism film 21 is 90 degrees. By setting the microprism angle of 90 degrees, the microprism film 21 can convert the fluorescence emitted by the phosphor 22 into a central small-angle light beam, so as to increase the utilization rate of the fluorescence emitted by the phosphor 22.
The lower surface of the microprism film 21 is plated with a reflection increasing film (not shown), that is, the reflection increasing film is plated on a surface of the microprism film 21 facing the fluorescent powder 22, and the reflection increasing film is used for enhancing a reflection effect, preventing a laser display signal from penetrating through the imaging film 20, and preventing laser from damaging eyes of a driver. Specifically, the reflection increasing film can be a multilayer, and the light transmission amount can be better reduced and the reflection effect can be enhanced by the multilayer reflection increasing film.
It is understood that the positions of the fluorescent high-transmittance film and the reflection-increasing film on the lower surface of the microprism film 21 may be arbitrary, that is, the fluorescent high-transmittance film is located on the outer side of the reflection-increasing film, and the fluorescent high-transmittance film wraps the reflection-increasing film, or the reflection-increasing film is located on the outer side of the fluorescent high-transmittance film, and the reflection-increasing film wraps the fluorescent high-transmittance film.
Wherein, the fluorescent powder 22 is sprayed on the imaging film 20. Specifically, the phosphor 22 is sprayed between the microprism film 21 of the imaging film 20 and the glass substrate 23, and specifically, the phosphor 22 is sprayed on the upper surface of the glass substrate 23 of the imaging film 20. It is understood that the phosphor 22 has a certain thickness, so that the phosphor 22 will form a phosphor film after being sprayed on the upper surface of the glass substrate 23 of the imaging film 20.
The glass substrate 23 is disposed on a surface of the imaging film 20 facing the micro-projection light machine, the fluorescent powder 22 is sprayed on an upper surface of the glass substrate 23, and antireflection films (not shown) are respectively coated on the upper surface and the lower surface of the glass substrate 23 and used for antireflection of laser display signals from the micro-projection light machine.
Specifically, the antireflection film is a transparent film, and the antireflection film is made of a transparent material doped with nanoparticles, wherein the transparent material is transparent in a visible light range. Preferably, the transparent material can be made of one of glass, organic glass, acrylic, PMMA, PC, PET and the like, nano particles with a certain proportion are mixed in the manufacturing process, the mixed nano particles consist of at least three nano particles with different sizes, each nano particle has a fixed resonance Rayleigh scattering wavelength, the wavelengths of the various nano particles are the same as and correspond to the light emitting wavelength of a laser light source one by one, and the density of each nano particle in the antireflection film is adjusted, so that each laser can form a bright picture on a screen. The nano particles can be composed of an inner core made of non-metal materials and nano particles coated with a metal layer on the outer layer. The selected material and the particle size are matched with the resonance Rayleigh scattering wavelength according to the wavelength of the used laser light source so as to ensure that the nanoparticles generate effective resonance Rayleigh scattering on the laser light source.
It is understood that the antireflection film is coated on the upper surface and the lower surface of the glass substrate 23, and in order to increase the reflection of the laser display signal from the micro-projector, the fluorescent powder 22 should be sprayed on the antireflection film, specifically, the fluorescent powder 22 is sprayed on the upper surface of the antireflection film, that is, the side of the antireflection film facing the micro-prism film 21.
Specifically, the upper surface of the glass substrate 23 is further coated with a high reflective film (not shown) for reflecting the fluorescent display signal excited by the laser display signal. In particular, the highly reflective film, also referred to as a highly reflective film, in an optical film, is an optical element that reflects most or almost all of the incident light energy back. A thin film with the thickness d is plated on the optical device, so that the optical path difference of two reflected lights (or transmitted lights) with equal intensity meets the condition of interference enhancement and weakening, and the transmissivity or the reflectivity of the optical device can be improved. A thin film that increases reflectivity (i.e., the difference in optical path length of reflected light) is a highly reflective film. High-reflection films are commonly used on the lens of optical instruments. Because the intensity of two adjacent beams is different, a multilayer film is often adopted in practice, so that the reflectivity of the high-reflection film is more than 99%. Some mirrors require a sufficiently high reflectivity without requiring film absorption and transmission, and they can be made with simple metal films to meet common requirements. In some applications, if the desired reflectivity is higher than that achievable with the metal film, additional dielectric layers may be applied to the metal film to increase their reflectivity. Still other mirrors, which require not only a large reflectivity but also a minimum absorption, are generally all dielectric multilayer reflective films. Because the wave bands of fluorescence and laser are different, an antireflection film and an antireflection film can be coated on different wave bands at the same time, and because the fluorescent powder emits fluorescence with the same intensity in all directions, in order to collect the fluorescence emitted in the direction of the glass substrate, a high-reflection film capable of reflecting the fluorescence is coated on the upper surface of the glass substrate, so that the fluorescence is reflected to enter the microprism film, and then projection display is carried out. The high-reflection film comprises a metal high-reflection film and a medium high-reflection film, the metal of the metal high-reflection film can comprise gold, silver, copper, aluminum and the like, and the medium of the medium high-reflection film can be an ultraviolet band, an infrared band and a visible band. In the embodiment of the invention, the medium of the high-reflection film is an ultraviolet band.
it can be understood that the upper surface of the glass substrate 23 is plated with an antireflection film and a high-reflection film, and the phosphor 22 is sprayed on the upper surface of the antireflection film or the high-reflection film. The position relationship between the antireflection film and the high-reflection film can be any, that is, the antireflection film is positioned on the outer side of the high-reflection film, and the antireflection film wraps the high-reflection film, or the high-reflection film is positioned on the outer side of the antireflection film, and the high-reflection film wraps the antireflection film.
Under the action of the micro-prism film 21, the imaging film 20 can collect light emitted by the phosphor 22 at a large angle, please refer to fig. 4, fig. 4 is a schematic view of fluorescence emission of the imaging film according to an embodiment of the present invention, as shown in fig. 4, a light emitting point O of the phosphor is taken as an example, fluorescence emitted by the light emitting point O can be converted into a light beam at a small angle at the center at a position indicated by dotted lines at two sides after passing through the micro-prism film 21, so as to increase the utilization rate of a fluorescence display signal, and when the phosphor downwardly emits the fluorescence display signal, the fluorescence display signal can be reflected by the glass substrate, so that the utilization rate of the fluorescence is further increased, which is beneficial to improving the imaging efficiency.
Wherein, the reflector 30 is used for reflecting the fluorescent display signal. Specifically, the reflector 30 is disposed on a surface of the imaging film opposite to the micro-projector, the reflector 30 is configured to reflect a fluorescent display signal emitted by the phosphor of the imaging film 20, and the fluorescent display signal is generated by exciting the phosphor with a laser display signal emitted by the micro-projector 10. In the present embodiment, the reflector 30 is a plane reflector.
The concave reflector 40 is disposed in a direction of a reflected light of the reflector 30, that is, a direction of the fluorescent display signal, and the concave reflector 40 is configured 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.
The windshield 50 is configured to receive light, that is, the fluorescent display signal. Specifically, the inner surface of the windshield 50 is coated or attached with a film having a high surface reflectivity for reflecting light to the eyes 60 of the driver. Specifically, the inner side of the windshield 50 is provided with a holographic optical film, light rays are reflected on the holographic optical film through an optical diffraction effect to form a holographic three-dimensional image at a distance, the effect of combining virtual indication information and an actual road is realized, and a driver can see an augmented reality effect through a sight line area.
The reflector 30, the concave reflector 40 and the windshield 50 constitute a projection optical path system, and the projection optical path system is used for projecting the fluorescent display signal to the eyes 60 of the driver.
In an embodiment of the present invention, there is provided a head up display based on a laser light source, including: the micro-projection optical machine is used for sending laser display signals; the imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving the laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on the imaging film, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal; a projection optical path system for projecting the fluorescent display signal to a driver's eye. By adopting the mode, the invention can eliminate laser speckles, reduce the dependence on high-temperature-resistant fluorescent powder, prolong the service life of the fluorescent powder and improve the brightness of generated fluorescence.
example 2
referring to fig. 1, fig. 1 is a schematic structural diagram of a head-up display based on a laser light source according to an embodiment of the present invention;
as shown in fig. 1, the laser light source-based head up display 100 includes: a micro-projector 10, an imaging film 20, a mirror 30, a concave mirror 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.
The micro-projection optical machine 10 is used for providing a laser light source, the micro-projection optical machine 10 is a laser micro-projection optical machine, and the laser micro-projection optical machine can provide higher brightness than an LED and has the advantages of good monochromaticity and coherence. The use of laser light causes the formation of unwanted striped spots, commonly referred to as speckle, upon reflection at various interfaces within the micro-projector. The reason why the speckle is generated is that the laser has strong monochromaticity and coherence, and the phases in time and space are overlapped with each other, so that the coherence of the laser must be eliminated. Specifically, the micro-projector 10 may include a laser source assembly, which is composed of at least one laser. Preferably, the laser light source assembly comprises a semiconductor laser with a small volume, and the laser light source assembly is used for providing a laser light source. Preferably, the laser Light source is a DLP violet laser Light source, and the micro-projector is a Digital Light Processing projector (DLP) or a laser micro-projector. The micro-projector 10 can generate violet laser display signals after being controlled by image source signals.
The imaging film 20 is disposed at a focal position of the micro-projector 10, the imaging film 20 is configured to receive a laser light source generated by the micro-projector 10, specifically, the laser light source is a DLP laser light source, the micro-projector 10 sends a laser display signal to the imaging film 20, the imaging film 20 is sprayed with phosphor, and the imaging film 20 is configured to convert the laser display signal into a fluorescent display signal. Specifically, the fluorescent powder on the imaging film 20 will emit a fluorescent display signal after being excited by the laser display signal. Specifically, the fluorescent powder on the imaging film 20 will emit a fluorescent display signal after being excited by the laser display signal. By focusing the micro-projector 10, the imaging film 20 can be located at the focal position of the micro-projector 10.
In the light path of the head-up display, only light with a small angle can be utilized by the light from the image source image generator, and when the fluorescent powder emits light, the fluorescent powder emits fluorescent light with the same brightness in all directions and has isotropy.
referring to fig. 3, fig. 3 is a schematic structural diagram of an imaging film according to a second embodiment of the disclosure;
As shown in fig. 3, the imaging film 20 includes: microprism film 21 and phosphor 22. In conjunction with figure 1 again, the following description of the preferred embodiment,
the phosphor 22 is sprayed on the lower surface of the microprism film 21, that is, the phosphor 22 is sprayed on the surface of the microprism film 21 facing the micro projector 20.
the micro prism film 21 is arranged on one surface of the imaging film 20 facing the projection optical path system, specifically, the micro prism film 21 is arranged on one surface of the imaging film 20 facing the reflector, the upper surface and the lower surface of the micro prism film 21 are both plated with a fluorescent high-transmittance film, and the fluorescent high-transmittance film is used for enabling a fluorescent display signal to penetrate through the micro prism film 21 to reach the projection optical path system. Specifically, the fluorescent high-transmittance film is used to enable a fluorescent display signal to reach the reflecting mirror through the microprism film 21. Specifically, the fluorescent high-transmittance film may be a transparent film, the antireflection film is made of transparent materials doped with nanoparticles, and the transparent materials are transparent in a visible light range. Preferably, the transparent material may be made of one of glass, organic glass, acryl, PMMA, PC, PET, or the like, or the fluorescent high-transmittance film may be a high-transmittance PVC fluorescent film, a high-transmittance fluorescent quantitative PCR sealing plate film, and the like.
wherein, the microprism angle of the microprism film 21 is 90 degrees. By setting the microprism angle of 90 degrees, the microprism film 21 can convert the fluorescence emitted by the phosphor 22 into a central small-angle light beam, so as to increase the utilization rate of the fluorescence emitted by the phosphor 22.
the lower surface of the microprism film 21 is plated with a reflection increasing film (not shown), that is, the reflection increasing film is plated on a surface of the microprism film 21 facing the fluorescent powder 22, and the reflection increasing film is used for enhancing a reflection effect, preventing a laser display signal from penetrating through the imaging film 20, and preventing laser from damaging eyes of a driver. Specifically, the reflection increasing film can be a multilayer, and the light transmission amount can be better reduced and the reflection effect can be enhanced by the multilayer reflection increasing film.
it is understood that the positions of the fluorescent high-transmittance film and the reflection-increasing film on the lower surface of the microprism film 21 may be arbitrary, that is, the fluorescent high-transmittance film is located on the outer side of the reflection-increasing film, and the fluorescent high-transmittance film wraps the reflection-increasing film, or the reflection-increasing film is located on the outer side of the fluorescent high-transmittance film, and the reflection-increasing film wraps the fluorescent high-transmittance film.
Wherein, the fluorescent powder 22 is sprayed on the imaging film 20. Specifically, the phosphor 22 is sprayed on the lower surface of the microprism film 21. It is understood that the phosphor 22 has a certain thickness, so that the phosphor 22 forms a phosphor film after being sprayed on the lower surface of the microprism film 21 of the imaging film 20. Due to the fact that glass substrates are reduced, only the microprism film 21 and the fluorescent powder 22 are reserved in the imaging film 20, and the fluorescent powder 22 is sprayed on the back surface of the imaging film 20, so that the thickness of the imaging film 20 is reduced, and the definition of images displayed by the imaging film 20 is increased.
Under the action of the microprism film 21, the imaging film 20 can collect light emitted by the phosphor 22 at a large angle, please refer to fig. 4, fig. 4 is a schematic view of fluorescence emission of the imaging film according to an embodiment of the present invention, as shown in fig. 4, taking a light emitting point O of the phosphor as an example, fluorescence emitted by the light emitting point O can be converted into a light beam at a small angle at the center at a position indicated by dotted lines at two sides after passing through the microprism film 21, so that a utilization rate of a fluorescence display signal can be increased, which is beneficial to improving imaging efficiency.
wherein, the reflector 30 is used for reflecting the fluorescent display signal. Specifically, the reflector 30 is disposed on a surface of the imaging film opposite to the micro-projector, the reflector 30 is configured to reflect a fluorescent display signal emitted by the phosphor of the imaging film 20, and the fluorescent display signal is generated by exciting the phosphor with a laser display signal emitted by the micro-projector 10. In the present embodiment, the reflector 30 is a plane reflector.
the concave reflector 40 is disposed in a direction of a reflected light of the reflector 30, that is, a direction of the fluorescent display signal, and the concave reflector 40 is configured 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.
The windshield 50 is configured to receive light, that is, the fluorescent display signal. Specifically, the inner surface of the windshield 50 is coated or attached with a film with high surface reflectivity, so as to reflect light to the eyes of the driver. Specifically, the inner side of the windshield 50 is provided with a holographic optical film, light rays are reflected on the holographic optical film through an optical diffraction effect to form a holographic three-dimensional image at a distance, the effect of combining virtual indication information and an actual road is realized, and a driver can see an augmented reality effect through a sight line area.
The reflector 30, the concave reflector 40 and the windshield 50 constitute a projection optical path system, and the projection optical path system is used for projecting the fluorescent display signal to the eyes 60 of the driver.
In an embodiment of the present invention, there is provided a head up display based on a laser light source, including: the micro-projection optical machine is used for sending laser display signals; the imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving a laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on one surface of the imaging film facing the micro-projection optical machine, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal; a projection optical path system for projecting the fluorescent display signal to a driver's eye. By directly spraying the fluorescent powder on the back of the imaging film, the thickness of the imaging film is reduced, the definition of an image displayed by the imaging film is increased, the elimination of laser speckles is realized, the dependence on the high-temperature-resistant fluorescent powder is reduced, the service life of the fluorescent powder is prolonged, and the brightness of generated fluorescence is improved.
It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention, and the present invention is provided for understanding the present disclosure more fully. Furthermore, the above-mentioned technical features are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. a head-up display based on a laser light source, comprising:
The micro-projection optical machine is used for sending laser display signals;
The imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving the laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on the imaging film, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal;
A projection optical path system for projecting the fluorescent display signal to a driver's eye.
2. the heads-up display of claim 1 wherein the projection light path system comprises: a reflector, a concave reflector and a windshield;
the reflector is used for reflecting the fluorescent display signal;
The concave reflector is used for reflecting the fluorescent display signal from the reflector to the windshield;
The windshield is used for projecting the fluorescent display signal from the concave reflector to the eyes of the driver.
3. The heads-up display of claim 1 or 2 wherein the imaging film comprises:
the glass substrate is arranged on one surface, facing the micro-projection light machine, of the imaging film, the fluorescent powder is sprayed on the upper surface of the glass substrate, antireflection films are plated on the upper surface and the lower surface of the glass substrate, and the antireflection films are used for antireflection of laser display signals from the micro-projection light machine.
4. The head-up display of claim 3, wherein the phosphor is spray coated on the top surface of the anti-reflection film.
5. the head-up display of claim 3, wherein the upper surface of the glass substrate is further coated with a high-reflection film for reflecting fluorescent display signals excited by the laser display signals.
6. The heads-up display of claim 1 wherein the imaging film further comprises:
the micro-prism film is arranged on one surface, facing the projection light path system, of the imaging film, the upper surface and the lower surface of the micro-prism film are plated with fluorescent high-transmittance films, and the fluorescent high-transmittance films are used for enabling fluorescent display signals to penetrate through the micro-prism film to reach the projection light path system.
7. The heads-up display of claim 6 wherein the microprism angle of the microprism film is 90 degrees.
8. The head-up display of claim 6 or 7, wherein the lower surface of the microprism film is coated with a reflection enhancement film for preventing laser display signals from passing through the imaging film.
9. A head-up display based on a laser light source, comprising:
The micro-projection optical machine is used for sending laser display signals;
The imaging film is arranged at the focus position of the micro-projection optical machine and used for receiving a laser display signal sent by the micro-projection optical machine, fluorescent powder is sprayed on one surface of the imaging film facing the micro-projection optical machine, and the fluorescent powder is excited by the laser display signal and then sends out a fluorescent display signal;
A projection optical path system for projecting the fluorescent display signal to a driver's eye.
10. The head-up display of claim 9, wherein the imaging film comprises a micro-prism film, and the phosphor powder is sprayed on a side of the micro-prism film facing the micro-projector light engine.
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| CN201810549447.2A CN110543016A (en) | 2018-05-31 | 2018-05-31 | Head-up display based on laser light source |
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| CN201810549447.2A CN110543016A (en) | 2018-05-31 | 2018-05-31 | Head-up display based on laser light source |
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