CN112764219B - Head-up display system and application thereof - Google Patents

Head-up display system and application thereof Download PDF

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Publication number
CN112764219B
CN112764219B CN201911069124.4A CN201911069124A CN112764219B CN 112764219 B CN112764219 B CN 112764219B CN 201911069124 A CN201911069124 A CN 201911069124A CN 112764219 B CN112764219 B CN 112764219B
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volume holographic
display system
multiplexed
multiplexing
viewpoints
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CN112764219A (en
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吴尚亮
谢前森
郎海涛
王一峰
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Ningbo Sunny Automotive Optech Co Ltd
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Ningbo Sunny Automotive Optech Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • 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
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Holo Graphy (AREA)

Abstract

The invention provides a head-up display system and application thereof, wherein the head-up display system comprises a projection module and a multiplex volume holographic element, wherein the projection module projects a projection picture, the multiplex volume holographic element is arranged in the emergent direction of the projection module, the multiplex volume holographic element diffracts the projection picture projected by the projection module and generates at least two contact viewpoints, the multiplex volume holographic element is arranged in the visible road condition direction of a driver, and the multiplex volume holographic element is suitable for receiving driving related information carried by the projection picture when the driver sees the road condition.

Description

Head-up display system and application thereof
Technical Field
The invention relates to the field of head-up display, in particular to a head-up display system and application thereof.
Background
During driving of the automobile, a Head Up Display (Head Up Display) may project relevant information on an instrument panel to a position directly in front of a driver's sight line. Therefore, the driver can watch the driving information without lowering head, and the driving safety is improved. The existing head-up display device can be mainly divided into: traditional geometric optics based head-up display, optical waveguide based head-up display, and volume hologram based head-up display.
First, the head-up display device based on geometric optics needs at least 2 curved mirrors to guide light, which mainly uses the principle of geometric imaging. With the pursuit of a large field angle and a large eye box (eyebox) area, the volume of the head-up display device is larger, but the front space of the automobile is limited, and the head-up display device is not suitable for being applied to a smaller moving space. In addition, the head-up display device based on the geometric optics has a short projection distance and poor image definition and image brightness. It is worth mentioning that such a head-up display device is not only bulky, but also less flexible in performance manipulation. Therefore, such head-up display devices are not adapted to future development of vehicle-mounted head-up displays.
Secondly, the head-up display device based on the optical waveguide mainly utilizes three different grating areas to modulate incident light to realize head-up display. Specifically, light generated by the image generation unit is coupled into another grating region through a coupling grating region in the optical waveguide for total reflection transmission, enters the last grating region, is emitted to the front windshield, and enters human eyes after being reflected by the front windshield. However, the structural period of three grating regions in the optical waveguide is basically between 200nm and 600nm, and small changes of the structure have a large influence on the propagation of light. Therefore, the head-up display device is high in preparation difficulty, can be greatly influenced when partial damage occurs, and is difficult to continue working once partial damage occurs, so that the head-up display device is not suitable for future development of vehicle-mounted head-up display.
In order to solve the problem that the head-up display device is difficult to miniaturize and prepare, some of the prior art adopts a head-up display device based on volume holography. The volume hologram-based head-up display device diffracts light generated by the image generating unit to the human eye using the recording and reproducing principle of optical holography. The head-up display device based on the phase volume holography has the advantages of high transparency, high diffraction efficiency, long projection distance, small volume, and high definition and brightness of a projected image. Therefore, the head-up display device has wider application prospect compared with the former two devices.
However, when the existing head-up display device based on phase volume holography works, only one viewpoint can be generated in front of human eyes, wherein the size of the viewpoint is the eye box. Typically, the size of a viewpoint is limited, which limits to some extent the range over which a clear shadowgraph image can be viewed by the driver. When a driver moves in a large range, the existing head-up display device cannot meet the requirement that projected information can be received by the driver from all angles, so that the driving experience of the driver is poor, and even safety problems can occur in an emergency.
How to enlarge the range of the eye box on the premise of viewing clear images is a problem which needs to be solved urgently, so that the movable range of a driver is allowed to be larger.
Disclosure of Invention
It is an advantage of the present invention to provide a heads-up display system and applications thereof, the projection of which produces a larger range of viewpoints.
It is another advantage of the present invention to provide a heads-up display system and applications thereof that increase the visual range of received information to allow a user to receive projected relevant information over a greater range of motion.
Another advantage of the present invention is to provide a head-up display system and its application, which generates at least two mutually touching viewpoints by diffraction to human eyes to obtain a larger range of the eye boxes.
It is another advantage of the present invention to provide a head-up display system and applications thereof that diffract in a vertical direction to the eye to generate at least two tangent viewpoints to obtain a larger eye-box range.
Another advantage of the present invention is to provide a head-up display system and an application thereof, in which a method of stitching at least two viewpoints increases the eye box range of the viewpoints.
Another advantage of the present invention is to provide a head-up display system and its application, which generates at least two communicated viewpoints by diffracting to human eyes in the horizontal direction of the line of sight to obtain a larger range of the eyebox.
It is another advantage of the present invention to provide a head-up display system and applications thereof that generates at least two of the viewpoints correlated to each other at a point where a projection plane diffracts into a human eye to obtain a larger range of the eye box.
It is another advantage of the present invention to provide a heads-up display system and its application that generates at least 4 of the viewpoints in horizontal and vertical directions by diffracting to the human eye in an array to obtain a larger range of the eye-boxes.
Another advantage of the present invention is to provide a head-up display system and an application thereof, wherein the head-up display system includes a projection module and a multiplexed volume hologram element, wherein the multiplexed volume hologram element is disposed in an exit direction of the projection module, and wherein the multiplexed volume hologram element diffracts the projection picture projected by the projection module and generates at least two viewpoints.
Another advantage of the present invention is to provide a head-up display system and its application, wherein the projection range of the head-up display system is larger to allow a larger range of motion for the driver.
It is another advantage of the present invention to provide a heads-up display system and applications thereof wherein the multiplexed volume holographic element is reflective, wherein the multiplexed volume holographic element reflectively diffracts light to the human eye to obtain at least two of the viewpoints.
Another advantage of the present invention is to provide a head-up display system and its application, which can acquire the multiplexing times and multiplexing directions of the multiplexed volume hologram elements with the preset cell size and position of the viewpoint.
Another advantage of the present invention is to provide a head-up display system and an application thereof, in which the position of the viewpoint is acquired according to a driver's direction and the position of the front windshield.
It is another advantage of the present invention to provide a head-up display system and applications thereof that achieve higher diffraction efficiency.
Another advantage of the present invention is to provide a head-up display system and an application thereof, wherein the projection distance is long, so that the fatigue of the eyes is lower during switching between the road condition in front and the head-up display system, and the driving feeling of the driver is better.
Another advantage of the present invention is to provide a head-up display system and an application thereof, which are easy to manufacture.
Another advantage of the present invention is to provide a head-up display system and an application thereof, wherein the head-up display system projects a viewpoint that generates a larger range by using the multiplexed volume hologram without increasing the overall volume of the head-up display system, and is more suitable for a mobile space, and occupies a small mobile space.
Another advantage of the present invention is to provide a head-up display system and an application thereof, wherein the head-up multiplexed volume holographic element includes at least one multiplexed volume holographic film unit, and the multiplexed volume holographic film unit diffracts a projection image projected by the projection module to the human eye to generate at least two viewpoints, and increases the brightness of light from the viewpoints, and further improves the definition of the projected image.
Another advantage of the present invention is to provide a head-up display system and an application thereof, wherein the head-up multiplexed volume holographic element includes at least three multiplexed volume holographic film units, wherein the multiplexed volume holographic film units are arranged in a stacked manner, each of the multiplexed volume holographic film units diffracts a single color of the projection screen, the projection screens of at least three colors can be projected in a stacked manner by the at least three multiplexed volume holographic film units and diffract to human eyes to generate at least two of the viewpoints, the brightness of light of the viewpoints is increased, and further, the definition of the projected image is improved.
Another advantage of the present invention is to provide a head-up display system and applications thereof, wherein the head-up multiplexed volume holographic element includes at least three multiplexed volume holographic film units, wherein the multiplexed volume holographic film units that are stacked project the projection pictures of three colors of red, green, and blue, so as to allow the human eye to receive the projection pictures in color.
Another advantage of the present invention is to provide a head-up display system and an application thereof, wherein the multiplexing holographic element is disposed in a visible road condition direction of a driver, and is suitable for receiving driving related information carried by the projection image when the driver has a visible road condition, so that the head-up display system is safer.
Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.
In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved in a head-up display system, comprising:
the projection module projects a projection picture; and
and the multiplex volume holographic element is arranged in the emergent direction of the projection module, diffracts the projection picture projected by the projection module and generates at least two contact viewpoints, wherein the multiplex volume holographic element is arranged in the visible road condition direction of a driver and is suitable for receiving driving related information carried by the projection picture when the driver sees the road condition.
According to an embodiment of the present invention, the projection module further includes an imaging unit and a guiding unit disposed in an exit direction of the imaging unit, wherein the guiding unit is disposed in an incident direction of the multiplexed volume hologram element in such a manner that a projection direction is aligned, wherein the guiding unit guides the projection picture projected by the imaging unit to the multiplexed volume hologram element.
According to one embodiment of the invention, said multiplexed volume holographic elements are multiplexed at least twice to produce at least two said viewpoints in contact.
According to one embodiment of the invention, said multiplexed volume hologram is multiplexed at least twice in at least one direction to generate at least two said viewpoints which are in contact.
According to one embodiment of the present invention, the multiplexed volume hologram elements are multiplexed at least twice in two directions, respectively, to generate at least four of the viewpoints in an array.
According to one embodiment of the invention, the multiplexed volume hologram element may be maintained in a forward looking direction of the driver, and the projection module and the driver are arranged ipsilaterally with respect to the multiplexed volume hologram element.
According to one embodiment of the invention, the eyebox range of the viewpoint diffracted by the multiplexed volume hologram element is the eyebox range corresponding to at least two of the viewpoints spliced.
According to one embodiment of the present invention, the multiplexed volume holographic element is prepared in such a way that at least one multiplexed volume holographic film unit is superimposed, wherein the light projected by the projection module is diffracted by the multiplexed volume holographic film unit to be diffracted to the human eye to generate at least two of the viewpoints.
According to one embodiment of the present invention, the multiplexed volume hologram element is prepared in a manner that at least three multiplexed volume hologram film units are superimposed, wherein the light projected by the projection module is diffracted by the three multiplexed volume hologram film units to emit the projection pictures of at least three colors of red, green and blue to be diffracted to human eyes to generate at least two viewpoints.
According to one embodiment of the present invention, the projection module is disposed in the incident direction of the multiplexed volume hologram element in the direction of a predetermined light.
According to another aspect of the present invention, there is further provided a method for preparing a multiplexed volume holographic element, comprising the steps of:
(a) Acquiring the sizes and positions of eye boxes of at least two contact viewpoints;
(b) Acquiring the position and the times of multiplexing; and
(c) And constructing a proper holographic optical path to perform interference recording of the reference light and the object light so as to obtain the multiplexing volume holographic element.
According to one embodiment of the present invention, the step (a) of the method for preparing a multiplexed volume hologram element further comprises the steps of:
(a1) Acquiring the position of the viewpoint according to the distance between a driver and a windshield; and
(a2) And acquiring the size of the eye box of the viewpoint according to the moving range of the driver.
According to one embodiment of the present invention, the step (b) of the method for preparing a multiplexed volume hologram element further comprises the steps of:
and acquiring the multiplexing times of the multiplexing volume holographic element according to the size of the eye box of the single viewpoint, the range and the corresponding position required by the viewpoint diffracted to human eyes.
According to one embodiment of the present invention, the step (c) of the method for preparing a multiplexed volume hologram element further comprises the steps of:
and adjusting the angle of the object light incident to the multiplexing volume hologram element to form the at least two phase-contact viewpoints after the object light transmits through the multiplexing volume hologram element.
According to another aspect of the present invention, there is further provided a method of installing a head-up display system, comprising the steps of:
(A) Setting a multiplexing volume holographic element in the front view area of the driver; and
(B) And arranging a projection module in the incident direction of the multiplexing volume holographic element according to the projection direction of the preset light.
According to an embodiment of the present invention, the step (B) of the mounting method of the head up display system further includes the steps of:
the direction of the guide unit is adjusted by the guide unit arranged in the emergent direction of the image generation unit, so that the image generation unit projects light rays to the multiplexing volume holographic element and then diffracts the light rays to human eyes to generate at least two contacted viewpoints.
According to an embodiment of the present invention, the step (a) of the mounting method of the head-up display system further includes the steps of:
the multiplex volume hologram element is attached to a front windshield of a vehicle by the aid of the front windshield.
According to an embodiment of the present invention, the step (a) of the mounting method of the head-up display system further includes the steps of:
attaching the multiplex volume hologram element to a screen of a driver of the vehicle in a forward-looking direction.
According to an embodiment of the present invention, the step (a) of the method of installing the head up display system further includes the steps of:
calibrating said multiplexed volume hologram element which diffracts out at least two of said viewpoints.
According to an embodiment of the present invention, the step (a) of the method of installing the head up display system further includes the steps of:
calibrating the multiplexed volume holographic element that can diffract out at least four of the viewpoints.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.
Drawings
Fig. 1 is a schematic view of an application scenario of a head-up display system according to a first preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of a process for preparing a multiplexed volume holographic element according to a first preferred embodiment of the present invention.
Fig. 3 is a schematic optical path diagram of a head-up display system according to a first preferred embodiment of the present invention.
FIG. 4 is a schematic diagram of a method of manufacturing a multiplexed volume holographic element according to a first preferred embodiment of the present invention.
Fig. 5 is a schematic view of an installation method of the head up display system according to the first preferred embodiment of the present invention.
Fig. 6 is a schematic optical path diagram of a head-up display system according to a modified embodiment of the first preferred embodiment of the present invention.
Fig. 7 is a schematic view of an application scenario of the head-up display system according to the second preferred embodiment of the present invention.
Fig. 8 is a schematic optical path diagram of a head-up display system according to a third preferred embodiment of the present invention.
Fig. 9 is a schematic optical path diagram of a head-up display system according to a fourth preferred embodiment of the present invention.
Fig. 10 is a schematic view of an installation method of a head up display system according to a fourth preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
Referring to fig. 1 to 5, a heads-up display system and a method thereof according to a first preferred embodiment of the present invention are disclosed and explained in detail, wherein the heads-up display system can be applied to a vehicle 200, which allows a driver to see a projected one-dimensional image and a driving related information carried by the same without lowering his head when the driver drives the vehicle 200, wherein the heads-up display system projects a plurality of viewpoints to allow a user to see the driving related information within a wider range of motion.
It is worth mentioning that the driving related information may be other comprehensive information such as driving speed, oil amount, environment information in the vehicle, entertainment information in the vehicle, road condition information outside the vehicle, navigation information, weather information, and the like. Further, the driving information may be humidity, temperature, wind speed, information display related to music, vehicle distance between the front and rear vehicles, road congestion degree, navigation display, weather conditions of each area, and the like.
It should be noted that the driver may be a single driver, or may be at least two drivers, or may be artificial intelligence, and the invention is not limited in any way.
Referring to fig. 3, the head-up display system includes a projection module 10 and a multiplexed volume hologram 20, wherein the projection module 10 projects a beam of light to the multiplexed volume hologram 20, the beam of light is reflected by the multiplexed volume hologram 20 out of at least two viewpoints 100 to increase an eye box 101 of the viewpoints 100, wherein the larger the eye box 101 is, the larger the movable range of a driving side is, the better the driving experience is.
Preferably, the multiplexed volume hologram element 20 is a phase-type hologram film for obtaining high image brightness.
It is worth mentioning that the multiplexed volume hologram 20 is reflective, wherein the projection module 10 and the driver side are arranged on the same side with respect to the multiplexed volume hologram 20.
Referring to fig. 1, the multiple volume hologram 20 may be attached to a front windshield 201 of the vehicle 200, wherein when the multiple volume hologram 20 is attached to the front windshield 201, a driver is allowed to receive not only road condition information in front of the front windshield 201, but also the driving related information carried by the image frame reflected by the holohedral hologram 20.
It should be noted that the multiplexed volume hologram 20 only needs to be disposed at a forward-looking position on the driver side, and the present invention does not limit whether the multiplexed volume hologram 20 is attached to the front windshield 201 or another position, such as another support screen or the like.
The projection module 10 includes an image generating unit 11 and a guiding unit 12, wherein the image generating unit 11 is disposed in the incident direction of the guiding unit 12, wherein the guiding unit 12 guides the projection light guided by the image generating unit 11 to the multiplexed volume hologram element 20, wherein the multiplexed volume hologram element 20 receives the projection light guided by the guiding unit 12 and projects the projection light out of at least two viewpoints 100 to obtain a wider range of the eyebox 101, and generally, the size of one viewpoint 100 is limited, which limits the range of clear projection images that can be observed by human eyes to a certain extent. On the premise that a clear image can be observed, the larger the eye box 101 is, the larger the movable range of a driver is, and the better the driving experience is; therefore, the projected at least two viewpoints 100 can cover a larger moving range of the driver, so that when the driving information is moved in a larger range, the driving related information carried by the imaged picture diffracted by the multiplexed volume hologram element 20 can still be accurately received by human eyes, and in addition, the image definition and the image brightness of the projected image can be greatly improved.
Further, the eyebox 101 range of the viewpoint 100 diffracted by the multiplexed volume hologram element 20 is the eyebox 101 range corresponding to at least two of the viewpoints 100 spliced.
It should be noted that, the multiplexing volume hologram element 20 diffracts the received projection information and diffracts the received projection information to the eyes, wherein the projection distance of the head-up display system is further away, so that the fatigue of the eyes is low in the process of switching the road condition ahead and the head-up display system, and the driving feeling of the driver is better.
Further, the image generating unit 11 includes a light source and a display element disposed in a light emitting direction of the light source, wherein the light source emits light to the display element, and the display element carries the image of the imaging information to the guiding unit 12.
The display element may be implemented as an LCD, LCOS, and DLP, without limitation in the present invention.
Preferably, the multiplexed volume hologram element 20 projects two of the viewpoints 100, and the two viewpoints 100 are adjacent to each other to jointly define the eye box 101 with a larger range, and it should be noted that the field angle of the imaged picture projected by the multiplexed volume hologram element 20 may be increased or may not be changed, and is not limited in the present invention.
Referring to the first preferred embodiment of the present invention, the multiplexed volume hologram element 20 is implemented as a multiplexed volume hologram film, which can be adapted to be attached to the front windshield 201 without occupying a large space.
Optionally, the multiplexed volume holographic element 20 is implemented as a multiplexed volume holographic lens, and may also be adapted to be attached to the front windshield 201, as will be understood and appreciated by those skilled in the art.
The multiplexed volume holographic element 20 is implemented as a multiplexed volume holographic film. Preferably, the multiplexed volume hologram element 20 may include at least one multiplexed volume hologram film unit, wherein the multiplexed volume hologram element diffracts the light projected by the projection module 10 to diffract the multiplexed volume hologram element 20 of at least two of the viewpoints 100.
Preferably, the head-up multiplexed volume hologram film unit may be disposed in the front windshield 201 in an attached manner such that the projection module 10 and the driver side are maintained in the same side direction of the multiplexed volume hologram element 20.
The multiplexing volume holographic element 20 multiplexes at least twice to diffract the received light, the light is diffracted outwards to the human eyes to form at least two communicated viewpoints 100, and the visible range of the human eyes is expanded by splicing the viewpoints 100.
Referring to fig. 3, the multiplexed volume hologram element 20 extends along the x-axis direction and the z-axis direction, wherein the multiplexed volume hologram element 20 is multiplexed 2 times in the z-axis direction, and two viewpoints 100 extending in the z-axis direction are projected, so that the two viewpoints 100 are spliced to increase the area of the eye box 101.
Referring to fig. 4, the method of preparing the multiplexed volume hologram element 20 further includes the steps of:
(a) Acquiring the size and position of the eyebox 101 of the viewpoint 100;
(b) Acquiring the position and the times of multiplexing; and
(c) And constructing a proper holographic optical path to perform interference recording of the reference light 302 and the object light 301 so as to obtain the multiplexed volume holographic element 20.
According to the method for producing the multiplexed volume hologram element 20, the step (a) further comprises the steps of:
(a1) Acquiring the position of the viewpoint 100 according to the distance between the driver and the front windshield 201; and
(a2) The size of the eyebox 101 of the viewpoint 100 is acquired according to the moving range of the driver.
According to the method for producing the multiplexed volume hologram element 20, the step (b) further comprises the steps of:
(b1) The multiplexing times of the multiplexed volume hologram element 20 are obtained by the size of the eye box 102 of a single viewpoint 100 and the range and corresponding position required for diffracting the viewpoint 100 at the human eye.
According to the method for producing the multiplexed volume hologram element 20, the step (c) further comprises the steps of:
(c1) The angle of incidence of the object light 301 to the multiplexed volume hologram element 20 is adjusted to form the at least two contacting viewpoints 100 after the object light 301 passes through the multiplexed volume hologram element 20.
According to the method for manufacturing the multiplexed volume hologram 20, the reference beam 302 and the object beam 301 in the step (c) are provided by the same laser emitting device 300. Further, the laser emitting device 300 provides a light beam and splits the light beam into at least one reference beam 302 and at least one object beam 301, wherein the reference beam 302 and the object beam 301 perform interference recording in the same area of at least one thin film 2 to prepare the multiplexed volume hologram 20.
Referring to fig. 4, the laser emitting device 300 includes a laser source and a light splitting element, wherein the light splitting source is disposed in the emitting direction of the laser source, and the light splitting element splits laser beams and then guides the laser beams to the surface of the film 2 for interference, so as to prepare the multiplexed volume hologram 20.
The beam splitting element is preferably implemented as a half-mirror to split the reference beam 302 and the object beam 301.
It is worth mentioning that when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram element 20 and then diffracted to the human eye, at least two contact viewpoints 100 can be generated, thereby increasing the range of the eyebox 102.
Preferably, when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram element 20 and then diffracted to the human eye, at least two viewing points 100 in contact with each other are generated, thereby increasing the range of the eye box 102.
Alternatively, when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram element 20 and diffracted to the human eye, at least two tangential viewpoints 100 can be generated, thereby increasing the range of the eyebox 102.
Alternatively, at least two communicated viewpoints 100 can be generated when the same incident light as the reference light 302 irradiates the surface of the prepared multiplexed volume hologram 20 and is diffracted to the human eye, thereby increasing the range of the eyebox 102.
Alternatively, at least two viewpoints 100 associated with each other may be generated when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram 20 and diffracted to the human eye, thereby increasing the range of the eye box 102. According to the method for preparing the multiplexed volume hologram 20, at least one object beam 301 in the step (c) may simultaneously interfere with one reference beam 302 on the surface of the thin film 2.
Optionally, at least two object beams 301 in step (c) may simultaneously interfere with one reference beam 302 on the surface of the thin film 2.
According to the method for preparing the multiplex volume holographic element 20, at least one object beam 301 in the step (c) may also interfere with one reference beam 302 on the surface of the thin film 2 in sequence. Further, at least one object beam 301 interferes at the surface of the film 2, while a reference beam 302 interferes at the surface of the film 2. Alternatively, one reference beam 302 interferes at the surface of the thin film 2, and at least one object beam 301 interferes at the surface of the thin film 2.
Preferably, at least two object beams 301 in step (c) may also sequentially interfere with one reference beam 302 on the surface of the film 2. Further, at least two beams of object light 301 interfere at the surface of the thin film 2, and then one beam of reference light 302 interferes at the surface of the thin film 2. Optionally, one reference beam 302 interferes at the surface of the film 2, and then at least two object beams 301 interfere at the surface of the film 2.
Referring to fig. 5, the method of installing the head-up display system includes the steps of:
(A) Setting the multiplex volume hologram element 20 in a forward-looking area of a driver; and
(B) The projection module 10 is disposed in the incident direction of the multiplexed volume hologram 20 with the projection direction of the reference light 302.
It is worth noting that the installation method of the head-up display system is simpler compared with a head-up display device based on geometric optics and a head-up display device based on geometric optics, so that the production efficiency is improved, and the preparation difficulty is reduced.
The step (B) of the mounting method of the head-up display system further comprises the steps of:
(B1) The direction of the guiding unit 12 is adjusted by the guiding unit 12 disposed in the emitting direction of the image generating unit 12, so that the light projected by the image generating unit 11 is guided to the multiplexing volume hologram 20 and then can be diffracted to human eyes to generate at least two viewpoints 100.
The step (a) of the mounting method of the head-up display system further includes the steps of:
a multiplexed volume hologram is attached to the front windshield 201.
It is noted that the guiding unit 12 may be implemented as a mirror or the like.
Further, the surface shape of the reflector includes and is not limited to one of a spherical shape, a planar shape and a non-spherical shape, and is not limited in any way in the present invention.
A head-up display system according to a second preferred embodiment of the present invention is disclosed and explained in detail, referring to fig. 6 and 7, and unlike the first preferred embodiment, the multiplexed volume hologram 20 of the head-up display system is implemented as a multiplexed volume hologram film and is composed of three layers of the multiplexed volume hologram film units to realize color projection, wherein the multiplexed volume hologram 20 is attached to a screen 202 of the vehicle 200, wherein the screen 202 is disposed in a direction in front of eyes of a driver and between the front windshield 201 and the driver, and is adapted to allow the driver to see external road condition information and the driving related information diffracted by the multiplexed volume hologram 20 without a large rotation.
Further, the projection module 10 is disposed on a driver side of the multiplexed volume hologram element 20, wherein the driver side refers to a side of the driver side with respect to the multiplexed volume hologram element 20, that is, the projection module 10 and the driver side are disposed on the same side with respect to the multiplexed volume hologram element 20.
Preferably, the head-up multiplexed volume hologram element 20 includes at least three multiplexed volume hologram film units, wherein the multiplexed volume hologram film units are arranged in a stacked manner, wherein each of the multiplexed volume hologram film units diffracts a single color light of the projection screen, at least three colors of the projection screen are projected in a stacked manner by at least three multiplexed volume hologram film units and are diffracted to human eyes to generate at least two viewpoints 100, and the brightness of the light of the viewpoints 100 is increased, further, the definition of the projected image is improved.
It is worth mentioning that the head-up volume hologram 20 includes at least three volume hologram film units, wherein the superimposed volume hologram 20 projects light of three colors of red, green and blue to allow the human eye to receive the projected picture in color.
Referring to the first preferred embodiment of the present invention, the multiplexed volume hologram element 20 further includes a first multiplexed volume hologram film unit 21, a second multiplexed volume hologram film unit 22, and a third multiplexed volume hologram film unit 23, wherein the first multiplexed volume hologram film unit 21, the second multiplexed volume hologram film unit 22, and the third multiplexed volume hologram film unit 23 are sequentially stacked to constitute the multiplexed volume hologram element 20. The first, second and third multiplexed volume hologram film units 21, 22 and 23 respectively project at least one light ray of three colors, red, green and blue, so as to allow the human eye to receive the colored projection picture and diffract to the human eye to generate at least two viewpoints 100.
It should be noted that, since the first, second, and third multiplexed volume hologram film units 21, 22, and 23 are multiplexed at least twice respectively, and diffract the received light collectively, the light is diffracted outward to the human eye to form at least two communicated viewpoints 100, and the visible range of the human eye is expanded by splicing the viewpoints 100.
It should be noted that three-color projection can be realized only by the superposition of the first multiplexed volume holographic film unit 21, the second multiplexed volume holographic film unit 22 and the third multiplexed volume holographic film unit 23, so as to project the color projection picture.
Preferably, the multiplexed volume hologram element 20 projects three colors of light, red, green, and blue, to project the projection picture in color.
Further, the multiplex volume hologram element 20 uses a multi-layer superposition mode to diffract the received light provided by the projection module 10, so as to project the colored projection picture, so as to form at least two contact viewpoints 100, and enlarges the visible range at the human eyes by splicing the viewpoints 100, so as to enlarge the visual range of the driver, so as to provide better driving feeling for the driver, and even in the case of a large area, the projection information carried by the projected projection picture can still be obtained. In addition, the multiplexing volume hologram 20 is disposed in the visible road condition direction of the driver, and is suitable for receiving driving related information carried by the projection image when the driver has the visible road condition, so that the driving related information is safer.
The method for manufacturing the multiplexed volume hologram element 20 is different from the first preferred embodiment in that the step (a) of the method for manufacturing the multiplexed volume hologram element 20 further comprises the steps of:
(a1) Acquiring the position of the viewpoint 100 according to the distance between the driver and the screen 202; and
(a2) The size of the eyebox 102 of the viewpoint 100 is acquired according to the moving range of the driver.
Alternatively, the position of the viewpoint may be acquired according to the distance between the driver and the screen 202 in the step (a 1) of multiplexing the volume hologram element 20.
The method for manufacturing the multiplexed volume hologram element 20 is different from the first preferred embodiment in that the step (c) of the method for manufacturing the multiplexed volume hologram element 20 further comprises the steps of:
(c2) Constructing a proper holographic optical path to perform interference recording of the reference light and the object light so as to prepare at least two multiplexing volume holographic film units; and
(c3) At least two of the multiplexed volume holographic film units are stacked to produce the multiplexed volume holographic element 20.
More preferably, the step (c 3) may be performed to superpose at least three of the multiplexed volume hologram film units to prepare the multiplexed volume hologram element 20. And projecting a colorful projection effect by superposition of the multiplexing volume holographic film unit.
The method of installing the head-up display system is different from the first preferred embodiment in that the step (a) of the method of installing the head-up display system further includes the steps of:
attaching a multiplexed volume holographic element 20 to the screen 202, wherein the screen 202 is disposed in a forward-looking region of a human eye.
Referring to fig. 8, a third preferred embodiment of the present invention is disclosed and explained in detail, wherein the head-up display system differs from the head-up display system of the second preferred embodiment in that its projection generates at least two of the viewpoints 100 in the x-axis direction. That is, the multiplexed volume hologram element 20 extends along the x-axis direction and the z-axis direction, wherein the multiplexed volume hologram element 20 is multiplexed 2 times in the x-axis direction, and two viewpoints 100 extending in the x-axis direction are projected, so that the two viewpoints 100 are spliced to increase the eye box 101 area.
Referring to fig. 9, a fourth preferred embodiment of the present invention is disclosed and explained in detail, wherein the head-up display system differs from the head-up display system of the second preferred embodiment in that the projection thereof is multiplexed 2 times in the x-axis direction and the z-axis direction, respectively, to diffract to the human eye to form 4 of the viewpoints 100. That is, the multiplexed volume hologram element 20 extends along the x-axis direction and the z-axis direction, wherein the multiplexed volume hologram element 20 is multiplexed 2 times in the x-axis direction and the z-axis direction, respectively, to project 4 of the viewpoints 100 of the array extending in the x-axis direction, wherein the viewpoints 100 are tiled adjacent to each other to increase the eyebox 101 area.
The multiplexed volume hologram element 20 diffracts the incident light to the viewpoint 100 near the human eye in 4 contacts. Preferably, the 4 viewpoints 100 formed by the multiplexed volume hologram element 20 increase the eyebox of the viewpoints of a common volume hologram film by about 3 times, so that the driving side can still acquire the driving related information carried by the projection picture in a larger moving range, and in addition, the image definition and the image brightness of the projection can be greatly improved.
Preferably, at least 4 viewing points 100 contacting each other are generated when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram 20 and then diffracted to the human eye, thereby increasing the range of the eye box 102.
Alternatively, when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram element 20 and diffracted to the human eye, at least 4 tangential viewpoints 100 can be generated, thereby increasing the range of the eyebox 102.
Alternatively, at least 4 communicated viewpoints 100 can be generated when the same incident light as the reference light 302 irradiates the surface of the prepared multiplexed volume hologram 20 and is diffracted to the human eye, thereby increasing the range of the eyebox 102.
Alternatively, at least 4 interrelated viewpoints 100 may be generated when the same incident light as the reference light 302 is irradiated onto the surface of the prepared multiplexed volume hologram 20 and diffracted to the human eye, thereby increasing the range of the eyebox 102.
Referring to fig. 9, unlike the method of installing the head up display system of the second preferred embodiment, the method of installing the head up display system further includes the steps of, before the step (a) of the method of installing the head up display system:
calibrating the multiplexed volume holographic element 20 that can diffract out at least four of the viewpoints 100.
The step (B) of the mounting method of the head-up display system further includes the steps of:
(B1) By the guiding unit 12 disposed in the emitting direction of the image generating unit 12, the direction of the guiding unit 12 is adjusted, so that the light projected by the image generating unit 11 is guided to the multiplexing volume hologram 20 and then can be diffracted to the human eyes to generate at least four viewpoints 100.
The embodiments of the various embodiments can be freely combined, and the invention is not limited in any way in this respect.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (24)

1. A heads-up display system, comprising:
the projection module projects a projection picture; and
the multiplexing volume holographic element is used for multiplexing at least twice based on a beam of reference light to generate at least two contacted viewpoints, wherein the multiplexing volume holographic element is arranged in the emergent direction of the projection module, the multiplexing volume holographic element diffracts the projection picture projected by the projection module and generates at least two contacted viewpoints, the multiplexing volume holographic element is arranged in the visible road condition direction of a driver, and the multiplexing volume holographic element is suitable for receiving driving related information carried by the projection picture when the driver sees the road condition.
2. The head-up display system of claim 1, wherein the projection module further comprises an imaging unit and a guide unit disposed in an exit direction of the imaging unit, wherein the guide unit is disposed in an incident direction of the multiplexed volume hologram element in such a manner that a projection direction is aligned, wherein the guide unit guides the projection picture projected by the imaging unit to the multiplexed volume hologram element.
3. The heads-up display system of claim 1 wherein the multiplexed volume holographic elements are multiplexed at least twice in at least one direction to produce at least two of the viewpoints in contact.
4. The heads-up display system of claim 1 wherein the multiplexed volume holographic elements are multiplexed at least twice in two directions, respectively, to produce at least four of the viewpoints in an array.
5. The heads-up display system of claim 1 wherein the multiplexed volume holographic element can be maintained in a direction of a driver's visible road condition, and the projection module and driver are disposed ipsilaterally with respect to the multiplexed volume holographic element.
6. The heads-up display system of claim 1 wherein the eyebox range of the viewpoints diffracted by the multiplexed volume holographic element is the eyebox range corresponding to at least two of the viewpoints stitched.
7. The heads-up display system of claim 1 wherein the multiplexed volume holographic elements are fabricated in a manner that at least one multiplexed volume holographic element layer is superimposed, wherein light projected by the projection module is diffracted by the multiplexed volume holographic element layer to diffract to the human eye to produce at least two of the viewpoints.
8. The heads-up display system of claim 1 wherein the multiplexed volume holographic element is fabricated in a manner that at least three multiplexed volume holographic film units are superimposed, wherein light projected by the projection module is diffracted by the three multiplexed volume holographic film units to produce the projection picture of at least three colors red, green, and blue for diffraction to human eyes to produce at least two of the viewpoints.
9. The heads-up display system of claim 1 wherein the projection module is disposed in the incident direction of the multiplexed volume hologram element in a predetermined light direction.
10. A method of making a multiplexed volume holographic element, comprising the steps of:
(a) Acquiring the sizes and positions of eye boxes of at least two contact viewpoints;
(b) Acquiring the position and the times of multiplexing; and
(c) Constructing a proper holographic optical path to perform interference recording of the reference light and the object light so as to prepare a multiplexing volume holographic element;
in the step (c), at least two beams of the object light and one beam of the reference light are subjected to interference recording in the same area of at least one film to prepare the multiplex volume holographic element.
11. The method for preparing a multiplexed volume holographic element of claim 10, wherein said step (a) further comprises the steps of:
(a1) Acquiring the position of the viewpoint according to the distance between a driver and a windshield; and
(a2) And acquiring the size of the eye box of the viewpoint according to the moving range of the driver.
12. The method for preparing a multiplexed volume holographic element of claim 10, wherein said step (b) further comprises the steps of:
and acquiring the multiplexing times of the multiplexing volume holographic element according to the size of the eye box of the single viewpoint, the range and the corresponding position required by the viewpoint diffracted to human eyes.
13. The method for preparing a multiplexed volume holographic element of claim 10, wherein said step (c) further comprises the steps of:
and adjusting the angle of the object light incident to the multiplexing volume hologram element to form the at least two phase-contact viewpoints after the object light transmits through the multiplexing volume hologram element.
14. The method for preparing a multiplexed volume holographic element of claim 10, wherein said step (c) further comprises the steps of:
(c2) Constructing a proper holographic optical path to perform interference recording of the reference light and the object light so as to prepare at least two multiplexing volume holographic film units; and
(c3) And superposing at least three multiplexing volume holographic film units to prepare the multiplexing volume holographic element.
15. A method of installing a head-up display system, comprising the steps of:
(A) Setting a multiplexing volume hologram element in a forward-looking area of a driver, the multiplexing volume hologram element multiplexing at least two times based on a beam of reference light to generate at least two viewpoints in contact; and
(B) And arranging a projection module in the incident direction of the multiplexing volume holographic element according to the projection direction of the preset light.
16. The method of installing the heads-up display system of claim 15 wherein the step (B) further comprises the steps of:
the direction of the guide unit is adjusted by the guide unit arranged in the emergent direction of the image generation unit, so that the image generation unit projects light rays to the multiplexing volume holographic element and then diffracts the light rays to human eyes to generate at least two viewpoints.
17. The method of installing the heads-up display system of claim 15 wherein the step (a) further comprises the steps of:
the multiplex volume hologram element is attached to a front windshield of a vehicle by the aid of the front windshield.
18. The method of installing the heads-up display system of claim 15 wherein the step (a) further comprises the steps of:
attaching the multiplex volume hologram element to a screen of a driver of the vehicle in a forward-looking direction.
19. The method of installing a heads up display system of claim 15 wherein step (a) is preceded by the further steps of:
calibrating said multiplexed volume hologram from which at least two of said viewpoints can be diffracted.
20. The method of installing the heads up display system of claim 19 wherein the step (a) further comprises the steps of:
calibrating the multiplexed volume hologram that can diffract out at least four of the viewpoints.
21. The method of installing a heads-up display system of claim 19 wherein the step of preparing the multiplexed volume holographic element that produces at least two of the viewpoints further comprises the steps of:
acquiring the sizes and the positions of eye boxes of the at least two contacted viewpoints;
acquiring the position and the times of multiplexing; and
and constructing a proper holographic optical path to perform interference recording of the reference light and the object light so as to prepare the multiplex volume holographic element.
22. The method of installing a heads-up display system of claim 21 wherein the step of obtaining eye-box size and position of a viewpoint further comprises the steps of:
acquiring the position of the viewpoint according to the distance between a driver and a windshield; and
and acquiring the size of the eye box of the viewpoint according to the moving range of the driver.
23. The method of installing a heads-up display system of claim 21 wherein the step of obtaining the location and number of multiplexes further comprises the steps of:
and acquiring the multiplexing times of the multiplexing volume holographic element according to the size of the eye box of the single viewpoint, the range and the corresponding position required by the viewpoint diffracted to human eyes.
24. The method of installing a heads-up display system of claim 21 wherein the step of constructing a suitable holographic optical path for interference recording of the reference light and the object light further comprises the steps of:
and adjusting the incident angle of the object light to the multiplexing volume holographic element so as to form the at least two-phase contact viewpoint after the object light penetrates through the multiplexing volume holographic element.
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