CN113820867A - Space multiplexing head-up display imaging light path structure based on automobile windshield - Google Patents
Space multiplexing head-up display imaging light path structure based on automobile windshield Download PDFInfo
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- CN113820867A CN113820867A CN202111202678.4A CN202111202678A CN113820867A CN 113820867 A CN113820867 A CN 113820867A CN 202111202678 A CN202111202678 A CN 202111202678A CN 113820867 A CN113820867 A CN 113820867A
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- 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
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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
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Abstract
The invention discloses a head-up display imaging light path structure based on space multiplexing of an automobile windshield, which comprises an image generation unit, a first relay reflection lens and a concave reflection lens, wherein the first relay reflection lens is positioned in a main light path of an imaging light beam passing through the concave reflection lens and the automobile windshield, the imaging light beam emitted from the image generation unit is emitted to the first relay reflection lens, then reflected to the concave reflection lens, then reflected to the windshield and finally converged to the position of eyes of a driver, and the head-up display function is realized. The invention realizes that the relay reflecting lens is arranged in the main light path of the concave reflecting mirror and the windshield by the light path space multiplexing technology on the premise of the same picture size, thereby reducing the whole volume of the display, saving the space and having wider vehicle model adaptability.
Description
Technical Field
The invention relates to the technical field of head-up displays (HUDs) based on automobile windshields and the technical field of dielectric-free suspension displays, in particular to a head-up display imaging light path structure (HUD) or a dielectric-free suspension display (VPA) imaging light path structure (hereinafter referred to as a windshield-based display) based on the space multiplexing of the automobile windshields.
Background
Since the media-free suspension display is a new technical field, the following description is made in combination with the prior art status of the HUD industry:
the automobile head-up display technology is an important component of an intelligent cockpit of an intelligent networked automobile which is being vigorously developed at home and abroad at present, and through application and popularization of HUDs on high-end luxury brand automobiles such as BMW (horse-rush) in the early stage, more and more automobile factories and users realize the importance of the head-up display technology of the automobile on safe driving, and more automobile factories assemble a head-up display system on a new automobile of the automobile to be used as effective configuration for improving the safety of the automobile.
The automobile head-up display (HUD) industry has an industry pain point problem at present, namely the consumer hopes that the HUD's display screen is the bigger better, and is limited by the geometrical optics principle that present traditional HUD adopted, will obtain bigger display screen, need certain optical path, must adopt relay reflection lens in the middle of the design scheme, present relay reflection lens, because will obtain high reflectivity, need plate the total reflection membrane at the glass surface, therefore the transmissivity is very low, so relay reflection lens must arrange outside the light path, additionally occupy a part of independent space, therefore the volume of whole HUD product increases thereupon, however, the structure space under the motormeter platform is limited, the metal plate bounding wall of bigger HUD complete machine volume and motormeter platform, air conditioner defrosting air outlet that windshield used, installing support etc. easily produce the interference and arrange not down.
At present, the HUD imaging systems on the market mostly adopt zigzag light paths, as shown in fig. 1, relay reflectors adopting the conventional scheme are opaque, and must be arranged separately from a main light path, and additionally occupy a part of independent space, so that the overall occupied space is large.
Therefore, it is very practical to develop a more compact spatial multiplexing HUD optical path structure with a relay reflector in the middle of the optical path.
Disclosure of Invention
The invention mainly aims to provide a spatial multiplexing HUD imaging optical path structure, aiming at realizing that a relay reflecting lens is arranged in a main optical path of a concave reflecting mirror and a windshield through an optical path spatial multiplexing technology on the premise of the same picture size, so that the whole volume of a HUD is reduced, and the space is saved.
In order to achieve the above object, the present invention provides an imaging optical path structure of a head-up display based on spatial multiplexing of an automobile windshield, which is characterized by comprising an image generation unit, a first relay reflection lens and a concave reflection lens, wherein the first relay reflection lens is positioned in a main optical path through which an imaging light beam passes between the concave reflection lens and the automobile windshield, the imaging light beam emitted from the image generation unit is emitted to the first relay reflection lens, then reflected to the concave reflection lens, then reflected to the windshield, and finally converged to the position of eyes of a driver, so as to realize a head-up display function.
A further technical solution of the present invention is characterized in that a surface of the first relay reflector facing the concave reflector is provided with a polarizing film or a polarizing plate having reflection and transmission functions
The invention has the further technical scheme that one surface of the first relay reflection lens facing the image generation unit is provided with a polarizing film or a polarizing sheet with reflection and transmission functions, the reflectivity of linearly polarized light in the first polarization direction is more than 50%, and the transmissivity of linearly polarized light in the second polarization direction is more than 50%.
The further technical scheme of the invention is that a half-wave plate is attached to a light outlet of the image generation unit.
The further technical scheme of the invention is that the imaging light beam emitted by the image generation unit is an S-direction polarized linearly polarized light beam, and the half-wave plate rotates the orientation of the vibration plane of the S-direction polarized linearly polarized light beam emitted by the image generation unit by 90 degrees to form P-polarized light.
The invention has the further technical scheme that the polarization direction of a polarizing film or a polarizer with reflection and transmission functions on one surface of the first relay reflector facing the image generating unit is parallel to the direction of the P polarized light, and the imaging light beam containing the P polarized light is reflected to the concave reflector.
The further technical scheme of the invention is that one surface of the concave reflector facing the first relay reflector is provided with an 1/4 wave plate, and the fast axis of the 1/4 wave plate forms an included angle of 45 degrees with the polarization direction of the incident light beam.
A further technical solution of the present invention is that a plurality of second relay mirrors are further disposed between the image generating unit and the first relay mirror, and the second relay mirrors are one of flat mirrors, concave mirrors, or convex mirrors.
The further technical scheme of the invention is that the image generation unit adopts one of an LCD + backlight source, an LCOS projection module, a DLP projection module or a laser projection module.
The invention further adopts the technical scheme that the concave reflector is a quadrilateral lens with curvature or a polygonal lens with more than four sides, and the concave surface is plated with a reflecting film layer.
The space multiplexing head-up display imaging light path structure based on the automobile windshield has the beneficial effects that: according to the technical scheme, the vehicle-mounted image forming device comprises an image generating unit, a first relay reflector and a concave reflector, wherein the first relay reflector is positioned in a main light path through which an imaging light beam passes between the concave reflector and a vehicle windshield, the imaging light beam emitted from the image generating unit is emitted to the first relay reflector, then is reflected to the concave reflector, then is reflected to the windshield and finally is converged to the eye position of a driver, the display function is realized, the realization can be realized by a smaller product volume under the same HUD imaging field angle (FOV), and thus the vehicle-mounted image forming device can be arranged on more vehicle types by a smaller volume, the contradiction between a large picture and a small volume in the HUD industry is solved, and a large pain point in the industry is solved; by adopting the scheme of the invention, a larger display picture can be realized by using a similar product volume, and a larger FOV can be brought, so that the picture of the AR HUD is wider and higher, more farther lanes can be covered, when a vehicle runs with dangerous factors, the AR HUD can be projected out earlier, a driver can be early warned, and the safety of vehicle driving is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic design diagram of a prior art HUD imaging system;
FIG. 2 is a schematic structural diagram of a preferred embodiment of an imaging optical path structure of a spatially multiplexed heads-up display based on an automobile windshield according to the invention;
FIG. 3 is an assembly diagram of the preferred embodiment of the spatial multiplexing head-up display imaging optical path structure based on the windshield of the vehicle according to the present invention;
FIG. 4 is a schematic diagram of the operation of a preferred embodiment of the spatial multiplexing head-up display imaging optical path structure based on the automobile windshield according to the invention;
FIG. 5 is a schematic diagram of the optical path structure of the head-up display according to the preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of a typical LCD + backlight configuration;
FIG. 7 is a schematic diagram of a specific structure of a half-wave plate;
FIG. 8 is a schematic diagram of a relay lens configuration;
FIG. 9 is a schematic structural diagram of the 1/4 wave plate;
FIG. 10 is a schematic diagram of a concave mirror;
FIG. 11 is a schematic diagram of the principle of operation of a concave mirror and 1/4 wave plate.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a head-up display imaging light path structure based on the space multiplexing of an automobile windshield. Thereby saving more space occupied by the display.
Specifically, as shown in fig. 2 to 5, the preferred embodiment of the imaging optical path structure of the head-up display based on spatial multiplexing of the windshield of the vehicle according to the present invention includes an image generating unit 1(PGU), a first relay reflective mirror 2 and a concave reflective mirror 3, wherein the first relay reflective mirror 2 is located in a main optical path through which an imaging light beam passes between the concave reflective mirror 3 and the windshield of the vehicle, and the imaging light beam emitted from the image generating unit is emitted to the first relay reflective mirror, then reflected to the concave reflective mirror, then reflected to the windshield, and finally converged to the eye position of the driver, so as to implement a display function.
The image generation unit 1 adopts one of an LCD + backlight source, an LCOS projection module, a DLP projection module or a laser projection module. The concave reflector 3 is a quadrilateral lens with curvature or a polygonal lens with more than four sides, and the concave surface is plated with a reflecting film layer.
Wherein, one surface of the first relay reflector 2 facing the concave reflector 3 and the image generating unit 1 is provided with a polarizing film or a polarizer with reflection and transmission functions. The reflectivity of the first relay reflection lens 2 for linearly polarized light in a specific polarization direction is more than 50%, and the transmissivity of the linearly polarized light in another specific polarization direction is more than 50%.
The light outlet of the image generating unit 1 is pasted with a half-wave plate 4.
The imaging light beam emitted by the image generating unit 1 is an S-direction polarized linearly polarized light beam, and the half-wave plate 4 rotates the orientation of the vibration plane of the S-direction polarized linearly polarized light beam emitted by the image generating unit 1 by 90 degrees to form P-polarized light. The polarization direction of the polarizing film or polarizer with reflection and transmission functions on one surface of the first relay reflector 2 facing the image generating unit 1 is parallel to the direction of the P-polarized light, and reflects the imaging light beam containing the P-polarized light to the concave reflector.
The surface of the concave reflecting mirror 3 facing the first relay reflecting mirror is provided with an 1/4 wave plate 5, and the fast axis of the 1/4 wave plate 5 forms an included angle of 45 degrees with the polarization direction of the incident light beam.
The specific implementation method adopted by the embodiment is as follows: the first relay reflector 2 is arranged in the optical path of the imaging light beam of the concave reflector 3 and the windshield, the imaging light beam emitted by the image generating unit 1(PGU) is linearly polarized light S light with a specific polarization direction, after being modulated into P light in the vertical direction by the half-wave plate 4, the imaging light beam is emitted to the first relay reflector 2, one surface of the first relay reflector 2 facing the incident light beam is adhered or plated with a reflective polarizing film material, and the polarization direction is parallel to the P light direction, therefore, the reflective polarizing film material has a reflection function on the imaging light beam and reflects the light beam to the concave reflector 3, the 1/4 wave plate 5 is arranged on the surface of the concave reflector 3, the 1/4 wave plate 5 modulates the linearly polarized light of the imaging light beam into circularly polarized light, the circularly polarized light is changed into circularly polarized light in the opposite direction after being reflected by the inner surface of the concave reflector 3, the circularly polarized light passes through the 1/4 wave plate 5 again, the imaging light beam is changed into S-direction polarized light and is emitted to the same first relay reflector attached or plated with the reflective polarizing film material, and the polarization direction of the reflective polarizing film material of the first relay reflector is perpendicular to the S light direction, so that the imaging light beam has high transmittance for the S light, can penetrate through the relay reflector, is emitted to a windshield, and finally is converged to human eyes for imaging.
As an implementation scheme, in this embodiment, a plurality of second relay reflecting mirrors 6 are further disposed between the image generating unit 1 and the first relay reflecting mirror 2, and the second relay reflecting mirrors 6 are one of flat reflecting mirrors, concave reflecting mirrors 3, or convex reflecting mirrors.
In this embodiment, the plurality of second relay mirrors 6 and the first relay mirror 2 are configured as a mirror group, and the embodiment is described below with a second relay mirror 6.
In this embodiment, the second relay reflector 6 is located between the image generating unit 1 and the first relay reflector 2, the first relay reflector 2 is located in the main optical path of the imaging light beam of the concave reflector 3 and the windshield of the vehicle, and a reflective polarizer is disposed on one surface of the first relay reflector 2 facing the concave reflector 3.
The specific implementation method adopted by the embodiment is as follows: linearly polarized light (S light) emitted by an image generation unit 1(PGU) is modulated into linearly polarized light (P light) in the vertical direction by an imaging light beam modulation device (a half-wave plate 42), the linearly polarized light (S light) is emitted to a second relay reflecting lens 6 in a relay reflecting lens group and then is reflected to a first relay reflecting lens 2, one surface of the last relay reflecting lens in the relay reflecting lens group, which faces the incident light beam direction, namely the first relay reflecting lens 2 (the last relay lens which reflects the imaging light beam to a concave mirror) is adhered or plated with a reflection polarizing film material, the linear polarization direction of the reflection polarizing film material is parallel to the linear polarization direction of the modulated imaging light beam (P light), the P light imaging light beam has a reflection effect and is reflected to the concave mirror 3, an included angle 1/4 wave plate 5 is arranged on the inner surface of the concave mirror 3, the fast axis of the 1/4 wave plate 5 forms an angle of 45 degrees with the polarization direction of the incident light beam (P light), the imaging light beam is modulated into right-handed circularly polarized light, after the imaging light beam is reflected by the inner surface of the concave mirror 3, the light beam is changed into left-handed circularly polarized light, the light beam passes through the 1/4 wave plate 5 on the surface of the concave mirror again, the light beam is modulated into linearly polarized light (S light) and is emitted to the same first relay reflector attached or plated with the reflective polarizing film material, the linearly polarized light direction of the first relay reflector is perpendicular to the S light, so that the S light has high transmittance, the light beam can transmit through the first relay reflector 2 and is emitted to a vehicle windshield, the inner surface of the windshield has higher reflectivity than the P light for the incident S light, and the light beam is focused on human eyes for imaging with higher brightness.
Because the first relay reflector 2 adhered or plated with the reflective polarizing film material has the characteristic of high reflectivity (> 50%) or high transmittance (> 50%) selectively for the imaging light beams in different polarization directions, the first relay reflector 2 can be arranged in the light path of the emergent light beams of the concave reflector 3 and the windshield, so that the two light beams in the same space are used without mutual interference in a compounding way, the light cannot be blocked, the problem that the relay reflector in the prior art is required to be arranged in the traditional light path arrangement direction out of the light path of the emergent light beams is solved, and the display is more compact and small in structure and has higher engineering application value.
The structure, function and operation principle of the elements involved in the imaging optical path structure of the head-up display based on the spatial multiplexing of the automobile windshield according to the present invention are further described in detail below.
The spatial multiplexing HUD imaging optical path structure comprises the following elements:
1. an image generating unit 1(PGU) that can generate a light beam containing image information, and this PGU emits a linearly polarized light beam of S-directional polarization (when the incident angle of the imaging light beam on the windshield surface, HUD optical path, or media-free floating display exceeds 60 degrees, the light wave of polarization direction perpendicular to the plane formed by the incident light and the reflected light is called S-polarized light, and the light wave of polarization direction coincident with this plane is called P-polarized light, S-light has a higher reflectance with respect to P-light, and in order to obtain higher image brightness, the linearly polarized light emitted by PGUs on the market at present is mostly S-light).
The PGU includes a graphic generation unit capable of converting an electrical signal into an optical signal, and generally employs an LCD + backlight, an LCOS projection module, a DLP projection module, and a laser projection module, where a schematic structural diagram of a typical LCD + backlight is shown in fig. 6.
The light emitted by the PGU is linearly polarized light S light with a specific polarization direction, and for the PGU of the LCD + backlight source and LCOS projection module scheme, an upper polarizer with the specific polarization direction can be adopted to modulate the S light.
In the prior art, a PGU made of an imaging device such as a TFT, an LCOS, a DLP, a laser MEMS, and the like is common, and in the present invention, a TFT liquid crystal display or an LCOS is preferably used as a PGU of the imaging device, and both of them use liquid crystal as a medium to control imaging light of each pixel point, and can directly emit linearly polarized light. If the DLP or the laser projection module is used as the PGU, a polarizer with a specific polarization direction is required to be used at the light outlet to realize polarization of the imaging beam, so as to modulate the S light.
2. The half-wave plate 4 is attached to the light outlet of the PGU, and can rotate the direction of the S-shaped linearly polarized light vibration surface emitted by the PGU by 90 degrees to form P light. The specific structure of the half-wave plate 42 is shown in fig. 7.
3. One surface of the relay reflection lens is adhered or plated with a reflection polaroid, and the polarization direction of the reflection polaroid is parallel to the P polarization direction emitted by the PGU modulated by the half-wave plate 4. The relay reflector has high reflection property for P light with the same polarization direction as the reflection polarizer and high transmission property for S light perpendicular to the reflection polarization direction. Fig. 8 is a schematic structural view of the relay reflector.
The invention preferably selects the curvature form of the non-reflecting surface of the relay reflecting film substrate with the polarized light reflecting function: the other (non-reflective) surface of the optional relay lens substrate may have a concave, convex, flat, fresnel surface curvature, and flat lenses are preferred for the present invention in view of cost.
4. 1/4 wave plate 5 placed on the surface of the concave reflector 3 and capable of modulating linearly polarized light into specific direction (left-handed circularly polarized light or right-handed circularly polarized light). The 1/4 wave plate 5 has different refractive indices (i.e., different propagation velocities) for incident light of different polarization directions. The 1/4 wave plate 5 is to control the material and thickness to make the light passing through the wave plate generate a phase difference of 1/4 wavelengths between the two lights with different polarization directions, and the light synthesized under the phase difference is circularly polarized light. The fast axis of the 1/4 wave plate 5 forms an angle of 45 degrees with the polarization direction of the incident light beam (P light), and modulates the imaging light beam into right-handed circularly polarized light, as shown in fig. 9.
The invention is preferably combined with the concave reflector 3, and the 1/4 wave plate 5 which can rotate the linear polarization direction of the imaging light beam by 90 degrees through incident and reflection twice is combined, and alternative implementation schemes are also provided, and the 1/4 wave plate 5 is preferred in the invention for cost.
5. The concave reflector 3 is a main imaging device of HUD or dielectric-free air suspension display, and may be a quadrilateral lens with curvature, or a polygonal lens with four or more sides, and the concave surface is plated with a reflective film, as shown in fig. 10.
The working principle of the spatial multiplexing HUD imaging optical path structure is as follows:
as shown in fig. 2 to 5, the present invention mainly arranges the relay reflector into the main optical path of the concave reflector 3 and the windshield by the optical path spatial multiplexing technology, so as to save the occupied space of the display.
The PGU is an image generation unit 1 of the HUD display system, and takes PGU of the TFT scheme as an example, and after the high-brightness LED backlight penetrates through the TFT display, an imaging light beam formed by S linearly polarized light with transverse polarization is emitted.
When the incidence angle of the imaging light beam of the HUD light path or the media-free floating display on the surface of the windshield exceeds 60 degrees, the light wave with the polarization direction perpendicular to the plane formed by the incident light and the reflected light is called S-polarized light, the light wave with the polarization direction consistent with the plane is called P-polarized light, the S light has higher reflectivity relative to the P light, and in order to obtain higher image brightness, most of the linearly polarized light emitted by the PGU on the market at present is the S light.
When an external power supply supplies power to an LED backlight source of the HUD display system with adaptive voltage and current, the backlight of the PGU is lightened, meanwhile, a display control signal is input through a display drive IC of the TFT, and an S polarized light imaging light beam with a specific polarization direction is generated at a light outlet of the PGU.
Firstly, a half-wave plate 4 is attached to a light outlet of the PGU, and the half-wave plate 4 can rotate the S-direction linearly polarized light emitted by the PGU by 90 degrees to form P-direction linearly polarized light.
And secondly, optionally, the imaging beam mainly composed of P-direction linearly polarized light is emitted to a second relay reflector 6 (the form of the relay reflector can be one or more of a plane reflector, a convex reflector and a concave reflector 3 which are combined with each other and arranged in front of the first relay reflector 2 to play a role in adjusting the optical path of the imaging system), and finally the imaging beam mainly composed of P-direction linearly polarized light is emitted to the first relay reflector 2.
Thirdly, a reflection polarizing film material is pasted or plated on one surface of the first relay reflection lens 2 facing the incident light beam, the linear polarization direction of the reflection polarizing film is parallel to the linear polarization direction of the modulated imaging light beam (P light), the reflection polarizing film has a reflection effect on the P light imaging light beam and reflects the light beam to the concave reflection mirror 3, and the position of the first relay reflection lens 2 is arranged in a light path between the concave reflection mirror 3 and the windshield glass.
The common reflective polarizing film materials in the market comprise a DBEF film, a VRP film and a CMF film of 3M company, which have high reflection effect (the reflectivity is more than 50%) on linear polarization parallel to the polarization direction of the film, and high transmission effect (the transmissivity is more than 50%) on the linear polarization perpendicular to the polarization direction of the film.
Fourthly, as shown in fig. 11, 1/4 wave plates 5 are placed on the inner surface of the concave mirror 3, the P-light imaging beam reflected by the first relay reflector 2 firstly passes through the 1/4 wave plate 5, the fast axis of the 1/4 wave plate 5 forms an angle of 45 degrees with the polarization direction of the incident beam (P light), the imaging beam is modulated into right-handed circularly polarized light, after being reflected by the inner surface of the concave mirror 3, the imaging beam is changed into left-handed circularly polarized light, and passes through the 1/4 wave plate 5 on the surface of the concave mirror again, the imaging beam is modulated into linearly polarized light (S light), and the linearly polarized light (S light) is emitted to the same first relay reflector 2 attached with or plated with the reflective polarizing film.
And fifthly, the polarization direction of the reflection polarization film attached to the reflection surface of the first relay reflector is perpendicular to the S-direction linearly polarized light, so that the S-direction linearly polarized light has high transmittance, and the light beam can penetrate through the first relay reflector 2 and irradiate to the windshield.
Although the position of the first relay reflector 2 is arranged in the optical path between the concave reflector 3 and the reflecting area of the windshield, because the first relay reflector 2 adhered or plated with the reflective polarizing film material has the characteristic of high reflectivity (> 50%) or high transmittance (> 50%) selectively for the imaging light beams in different polarization directions, the first relay reflector 2 can be arranged in the optical path of the emergent light beams of the concave reflector 3 and the windshield, so that the two light beams in the same space which do not face the polarization direction are used in a composite manner without mutual interference, the first relay reflector 2 has the characteristic of high transmittance for the S-direction polarized light emitted by the concave reflector 3, the brightness loss of the imaging light beams is not caused greatly, and the normal operation of the imaging optical path is ensured.
And sixthly, the S-direction polarized imaging light beam penetrates through the first relay reflector 2 and is emitted to the windshield, and the inner surface of the windshield has higher reflectivity than P light for the incidence of the S light, so that the S-direction polarized imaging light beam is finally converged into human eyes for imaging with higher brightness to form the HUD imaging system.
Since the imaging optical path structures of the automobile head-up display (HUD) and the dielectric-free suspension display (VPA) based on the automobile windshield are similar, the invention is also suitable for the imaging optical path structure of the dielectric-free suspension display (VPA) based on the automobile windshield, and the imaging optical path structure of the dielectric-free suspension display (VPA) realized by the embodiment provided by the invention is included in the patent protection scope of the invention.
The space multiplexing head-up display imaging light path structure based on the automobile windshield has the beneficial effects that: according to the technical scheme, the vehicle-mounted image forming device comprises an image generating unit, a first relay reflector and a concave reflector, wherein the first relay reflector is positioned in a main light path through which an imaging light beam passes between the concave reflector and a vehicle windshield, the imaging light beam emitted from the image generating unit is emitted to the first relay reflector, then is reflected to the concave reflector, then is reflected to the windshield and finally is converged to the eye position of a driver, the display function is realized, the realization can be realized by a smaller product volume under the same HUD imaging field angle (FOV), and thus the vehicle-mounted image forming device can be arranged on more vehicle types by a smaller volume, the contradiction between a large picture and a small volume in the HUD industry is solved, and a large pain point in the industry is solved; by adopting the scheme of the invention, a larger display picture can be realized by using a similar product volume, and a larger FOV can be brought, so that the picture of the AR HUD is wider and higher, more farther lanes can be covered, when a vehicle runs with dangerous factors, the AR HUD can be projected out earlier, a driver can be early warned, and the safety of vehicle driving is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The first relay reflection lens is positioned in a main light path of an imaging light beam passing between the concave reflection lens and the vehicle windshield, the imaging light beam emitted from the image generation unit is emitted to the first relay reflection lens, then reflected to the concave reflection lens, then reflected to the windshield and finally converged to the position of eyes of a driver, and the head-up display function is realized.
2. The imaging optical path structure of the spatially multiplexed heads-up display based on the automobile windshield according to claim 1, wherein a surface of the first relay reflector facing the concave reflector is provided with a polarizing film or a polarizer with reflection and transmission functions.
3. The imaging optical path structure of the spatially multiplexed heads-up display based on the automobile windshield according to claim 2, wherein the first relay reflector has a polarizing film or a polarizer with reflection and transmission functions on one surface facing the image generating unit, and has a linearly polarized light reflectivity of more than 50% for the first polarization direction and a linearly polarized light transmittance of more than 50% for the second polarization direction.
4. The imaging optical path structure of the spatial multiplexing head-up display based on the automobile windshield according to claim 1, wherein a half-wave plate is pasted at a light outlet of the image generation unit.
5. The imaging optical path structure of the spatial multiplexing head-up display based on the automobile windshield according to claim 4, wherein the imaging light beam emitted by the image generation unit is an S-direction polarized linearly polarized light beam, and the half-wave plate rotates the orientation of the vibration plane of the S-direction polarized linearly polarized light beam emitted by the image generation unit by 90 degrees to be P-polarized light.
6. The imaging optical path structure of the spatially multiplexed heads-up display based on the automobile windshield according to claim 1, wherein the polarization direction of the polarizing film or the polarizer with the reflection and transmission functions on the surface facing the image generating unit of the first relay reflecting mirror is parallel to the direction of the P-polarized light, and reflects the imaging beam containing the P-polarized light to the concave reflecting mirror.
7. The imaging optical path structure of the spatially multiplexed heads-up display based on the automobile windshield according to claim 1, wherein a face of the concave reflector facing the first relay reflector is provided with 1/4 wave plates, and a fast axis of the 1/4 wave plate forms an angle of 45 ° with a polarization direction of an incident light beam.
8. The imaging optical path structure of the automotive windshield-based spatially multiplexed heads-up display according to claim 1, wherein a plurality of second relay reflecting mirrors are further arranged between the image generating unit and the first relay reflecting mirror, and the second relay reflecting mirrors are one of plane reflecting mirrors, concave reflecting mirrors or convex reflecting mirrors.
9. The automotive windshield-based spatially multiplexed heads-up display imaging light path structure of claim 1 wherein the image generation unit employs one of an LCD + backlight, an LCOS projection module, a DLP projection module or a laser projection module.
10. The imaging optical path structure of the spatially multiplexed heads-up display based on the automobile windshield according to claim 1, wherein the concave reflector is a quadrilateral lens with curvature or a polygonal lens with more than four sides, and the concave surface is coated with a reflective film.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657304A (en) * | 2022-06-06 | 2023-01-31 | 华为技术有限公司 | Display device and vehicle |
| WO2023138076A1 (en) * | 2022-01-21 | 2023-07-27 | 华为技术有限公司 | Display apparatus and vehicle |
| TWI828134B (en) * | 2022-04-19 | 2024-01-01 | 大陸商業成科技（成都）有限公司 | Head-up display and optical reflection structure |
| WO2024045883A1 (en) * | 2022-08-27 | 2024-03-07 | 华为技术有限公司 | Display device, display method, and vehicle |
| CN115657304B (en) * | 2022-06-06 | 2024-05-14 | 华为技术有限公司 | Display device and vehicle |
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2021
- 2021-10-15 CN CN202111202678.4A patent/CN113820867A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023138076A1 (en) * | 2022-01-21 | 2023-07-27 | 华为技术有限公司 | Display apparatus and vehicle |
| TWI828134B (en) * | 2022-04-19 | 2024-01-01 | 大陸商業成科技（成都）有限公司 | Head-up display and optical reflection structure |
| CN115657304A (en) * | 2022-06-06 | 2023-01-31 | 华为技术有限公司 | Display device and vehicle |
| WO2023236582A1 (en) * | 2022-06-06 | 2023-12-14 | 华为技术有限公司 | Display device and transportation means |
| CN115657304B (en) * | 2022-06-06 | 2024-05-14 | 华为技术有限公司 | Display device and vehicle |
| WO2024045883A1 (en) * | 2022-08-27 | 2024-03-07 | 华为技术有限公司 | Display device, display method, and vehicle |
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