CN213690110U

CN213690110U - Vehicle-mounted holographic display device and motor vehicle

Info

Publication number: CN213690110U
Application number: CN202022155212.0U
Authority: CN
Inventors: 方涛; 徐俊峰; 陈川
Original assignee: Future Beijing Black Technology Co ltd
Current assignee: Future Beijing Black Technology Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-07-13
Anticipated expiration: 2030-09-27

Abstract

The application discloses on-vehicle holographic display device sets up in motor vehicle inner space for show holographic image, include: a display, a transflective element and a holographic display element; the display and the holographic display element are arranged in a first space on one side of the transflective element, the display displays an image and emits image light, the transflective element reflects the image light to the holographic display element, the holographic display element emits the image light incident to the holographic display element along the opposite direction of the incident direction, the emitted light is transmitted by the transflective element, and a holographic image is formed in a second space on one side of the transflective element, which is far away from the display. The vehicle-mounted holographic display device can form a holographic image floating in the air, can display a great deal of driving information, and obviously improves and enriches the driving experience.

Description

Vehicle-mounted holographic display device and motor vehicle

Technical Field

The application belongs to the technical field of optical display, and particularly relates to a vehicle-mounted holographic display device and a motor vehicle.

Background

Along with the development and popularization of automobile intellectualization, people have more and more diverse functional requirements on automobiles, and various electronic devices integrated on automobiles are more and more abundant. Holographic imaging is an optical display technology with a good display effect, can generate images floating in the air, further can realize an interaction function, conveniently displays various information to a driver or passengers, and can help to complete various task instructions.

However, the volume of the existing holographic imaging product is often larger and limited by the limited design space of the automobile, and the existing holographic imaging product is difficult to be directly applied to the vehicle-mounted field; moreover, the holographic imaging effect, the imaging size, whether imaging auxiliary equipment is needed or not and the like are also considered, so that the popularization and the use of the holographic imaging technology in the vehicle-mounted field are hindered, and the further popularization and the application of the holographic imaging technology and products are also limited.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a vehicle-mounted holographic display device, sets up in motor vehicle inner space for show holographic image, include: a display, a transflective element and a holographic display element; the display and the holographic display element are arranged in a first space on one side of the transflective element, the display displays an image and emits image light, the transflective element reflects the image light to the holographic display element, the holographic display element emits the image light incident to the holographic display element along the opposite direction of the incident direction, the emitted light is transmitted by the transflective element, and a holographic image is formed in a second space on one side of the transflective element, which is far away from the display.

For example, in some optional implementations of the embodiments of the present application, the method further includes: a housing case; the storage shell comprises a storage space and an opening, the display, the transflective element and the holographic display element are arranged in the storage space, and the holographic image is formed outside the opening.

For example, in some optional implementations of the embodiments of the present application, the method further includes: a fixing device; the fixing device fixedly mounts the storage housing in the motor vehicle interior space.

For example, in some optional embodiments of the present application, the fixing device includes at least one of a snap-in piece, an adhesive piece, a welding piece, a rivet piece, and a locking piece.

For example, in some optional embodiments of the present application, the fixing device further includes: at least one of an elevating mechanism, a rotating mechanism, or a translating mechanism.

For example, in some optional implementations of the embodiments of the present application, the method further includes: a controller, the display being electrically connected to the controller.

For example, in some optional implementations of the embodiments of the present application, the method further includes: the controller and the display are electrically connected with the collector.

For example, in some optional embodiments of the present application, the display is perpendicular to the transflective element, and the angle between the holographic display element and the transflective element is 30-60 °.

For example, in some alternative embodiments of the present application, the transflective element includes: the display comprises a transparent substrate, a transflective film and an absorption film, wherein the absorption film is arranged on one side of the transflective film far away from the display; the transflective film is used for reflecting light rays emitted by the display and transmitting light rays emitted by the holographic display element; the absorption film is used for absorbing light rays which are not emitted by the holographic display element.

For example, in some alternative embodiments of the present application, the holographic display element includes: a retro-reflective element and a phase delay element; the phase delay element is disposed between the retro-reflective element and the transflective element; the retro-reflecting element is used for transmitting the light rays incident to the retro-reflecting element along the direction opposite to the incident direction; the phase delay element is used for changing the phase of the light passing through the phase delay element.

For example, in some optional implementations of embodiments of the present application, the display includes: the liquid crystal display comprises a light source, a reflecting cup, a diffusion film and a liquid crystal screen; light emitted by the light source is reflected by the reflecting cup and is emitted to the diffusion film, the light is diffused by the diffusion film, the diffused light is emitted to the liquid crystal screen, and the liquid crystal screen displays images and emits image light.

The embodiment of the application also provides a motor vehicle, which comprises the vehicle-mounted holographic display device.

In the above-mentioned scheme that this application embodiment provided, through setting up display, transflective element and holographic display element, can show holographic image, on-vehicle holographic display device compact structure sets up in motor vehicle inner space and shows the holographic image of contents such as driving information, driving assistance, can show promotion and richen driving experience.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a first schematic diagram of an on-board holographic display device provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of a vehicle-mounted holographic display device according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a third embodiment of the present application;

FIG. 4 is a schematic diagram of a fourth embodiment of the present application showing an on-board holographic display device;

FIG. 5 is a schematic diagram of a fifth embodiment of an on-board holographic display device provided by the present application;

FIG. 6 shows a sixth schematic view of an in-vehicle holographic display device provided by an embodiment of the present application;

FIG. 7a is a schematic diagram showing a first transflective element of an on-board holographic display device according to an embodiment of the present disclosure;

FIG. 7b is a schematic diagram of a transflective element in an on-board holographic display device according to an embodiment of the present application;

FIG. 7c is a schematic diagram of a third exemplary transflective element of an on-board holographic display device according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a holographic display element in an on-board holographic display device according to an embodiment of the present application;

FIG. 9a is a schematic diagram showing a first retroreflective element of an on-board holographic display device according to an embodiment of the present application;

FIG. 9b is a schematic diagram of a second exemplary embodiment of a retro-reflective element of a holographic display device;

FIG. 9c is a schematic diagram of a third exemplary embodiment of a retroreflective element of a holographic display device;

FIG. 9d is a schematic diagram of a fourth exemplary retroreflective element of an in-vehicle holographic display device according to an embodiment of the present application;

FIG. 10a is a schematic diagram of a fifth exemplary retroreflective element of an in-vehicle holographic display device according to an embodiment of the present application;

FIG. 10b is a schematic diagram of a sixth exemplary retroreflective element in an on-board holographic display device according to an embodiment of the present application;

FIG. 10c is a schematic diagram of a seventh retroreflective element of the holographic display device provided by one embodiment of the present application;

FIG. 11 is a first schematic diagram of a display in an on-vehicle holographic display device according to an embodiment of the present application;

FIG. 12a is a schematic view of a first reflective cup of an in-vehicle holographic display device according to an embodiment of the present application;

FIG. 12b is a schematic diagram of a second example of a reflector cup of the holographic display device provided in this application;

FIG. 13 is a schematic diagram of a third example of a reflector cup in a holographic display device mounted on a vehicle according to an embodiment of the present disclosure;

FIG. 14 shows a seventh schematic view of an in-vehicle holographic display device provided by an embodiment of the present application;

FIG. 15a is a schematic diagram of a second display of the vehicle-mounted holographic display device according to the embodiment of the present application;

fig. 15b shows a schematic diagram three of a display in a vehicle-mounted holographic display device according to an embodiment of the present application.

Description of reference numerals: 10-a display; 101-a light source; 102-a reflector cup; 1021-a light exit; 1022-port; 103-a diffusion membrane; 104-a liquid crystal screen; 20-a transflective element; 201-a transparent substrate; 202-transflective film; 203-an absorbing film; 30-a holographic display element; 301-a retro-reflective element; 3011-a retroreflective element substrate; 3012-high reflection coating; 3013-solid spherical microstructure of transparent material; 3014-a solid transparent right-angled vertex microstructure of a regular triangular pyramid; 3015-solid transparent isosceles triangular pyramid right-angle vertex microstructure; 3016-cubic cone right-angle vertex microstructure made of solid transparent material; 3017-hollow concave right-angle vertex microstructure of regular triangular pyramid; 3018-hollow recessed isosceles triangular pyramid right angle vertex microstructure; 3019-hollow recessed cube-cone right-angle apex microstructure; 302-a phase delay element; 40-a storage case; 50-a fixture; 60-a controller; 70-sound box.

Detailed Description

The embodiments of the present application will be further described with reference to the accompanying drawings.

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

It should be noted that for simplicity and clarity of description, the following describes exemplary embodiments of the present application. Numerous details of the embodiments are set forth merely to aid in understanding the aspects of the present application. It will be apparent, however, that the present technology is not limited to these details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the present application. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". "first," "second," and the like are used merely as references to features and are not intended to limit the features in any way, such as in any order. In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.

An embodiment of the present application provides a vehicle-mounted holographic display device, disposed in an interior space of a motor vehicle, for displaying a holographic image, as shown in fig. 1 (fig. 1 is a cross-sectional view of the device), including: the display 10, the transflective element 20, and the holographic display element 30, the display 10 and the holographic display element 30 are disposed in a first space S1 on the side of the transflective element 20, the display 10 displays an image and emits image light, the transflective element 20 reflects the image light to the holographic display element 30, the holographic display element 30 emits the image light incident thereto in the opposite direction to the incident direction, the emitted light is transmitted through the transflective element 20, and a holographic image IM is formed in a second space S2 on the side of the transflective element 20 away from the display 10.

In the present embodiment, the hologram image IM is formed at the second space S2, and can be directly imaged in air or even vacuum without any imaging medium (e.g., dust, moisture, imaging crystal). The holographic image IM in the embodiment of the present application is a real image (real image), the real image is formed by converging real light rays, and is different from a virtual image (virtual image) which can only be viewed and cannot be touched, the real image can be directly touched, taking light rays emitted from a smaller display area (for example, a pixel point) on the display 10 in fig. 1 as an example, after the light rays pass through the transflective element 20, the holographic display element 30 and the transflective element 20 once, at the second space S2, light rays corresponding to the display area converge to form a corresponding area on the holographic image IM, at this time, a user such as a driver or a passenger can observe a real image which floats in the air and can be touched, and has a good sensory experience.

In this embodiment, the display 10 includes a display device capable of displaying images and emitting image light, and the displayed images include static or dynamic text, pictures or videos; for example, a driving assistant for a motor vehicle, which may be a real person or cartoon character, may be displayed; the display 10 may be a liquid crystal display, or an active Light-Emitting dot-matrix screen composed of Light-Emitting point Light sources such as LED (Light-Emitting Diode), OLED (Organic Light-Emitting Diode), and plasma Light-Emitting point; the projection imaging device may be a projection imaging device that is driven by a Light source such as an LED, an OLED, a laser, a fluorescent Light, or a combination thereof, based on a projection technology such as dlp (digital Light processing), LCOS (liquid Crystal on silicon), liquid Crystal, or the like, and is reflected or transmitted by a display panel such as a dmd (digital micro device), LCOS, LCD, or the like, and then projected onto a projection screen through a projection lens to form an image; the projection imaging device can also be used for scanning and imaging the laser beam on the screen; also, the display 10 includes real or virtual images of all of the display devices described above via one or more refractions or reflections.

In this embodiment, the transflective element 20 can transmit light and reflect light simultaneously, at least reflect the image light emitted from the display 10, and transmit the image light emitted from the holographic display element 30; the transflective element 20 does not mean that only the image light emitted from the display 10 is reflected, and only the image light emitted from the holographic display element 30 is transmitted, due to the influence of the material property, the processing accuracy, and the like of the transflective element 20; optionally, the reflectivity of the transflective element 20 to the image light emitted from the display 10 has a certain value range, for example, the reflectivity is between 20% and 90%; meanwhile, the transmittance of the transflective element 20 for the image light emitted from the holographic display element 30 also has a certain numerical range, for example, the transmittance is between 20% and 90%; it is understood that the higher the reflectivity of the transflective element 20 to the image light emitted from the display 10 and the higher the transmittance to the image light emitted from the holographic display element 30, the greater the number of image lights for forming the holographic image IM, that is, the higher the brightness of the holographic image IM, the higher the light efficiency of the on-vehicle holographic display device. For example, the transflective member 20 may be made of a transparent material such as a plate made of glass, quartz, resin, or a high molecular polymer; the transparent material may be additionally provided with a film layer or an optical element having a transflective function, which is not limited in this embodiment.

In this embodiment, the holographic display element 30 emits the image light incident thereto in the opposite direction to the incident direction, the emitted light is transmitted through the transflective element 20, and the holographic image IM is formed in the second space S2 on the side of the transflective element 20 away from the display 10; specifically, the holographic display element 30 emits the light incident thereto in the opposite direction to the incident direction, and the reflection path and the incident path can be considered to be slightly shifted when viewed microscopically; however, from a macroscopic view, it can be considered that the two paths are almost completely coincident. The holographic display element 30 is used not only to change the direction of the outgoing image light incident thereto, but also to change the properties of the incoming image light incident thereto such that the properties of the outgoing light are different from the properties of the incoming light, for example, at least one of polarization properties and spectral properties, such that the property-changed image light can be transmitted through the transflective element 20, thereby forming the holographic image IM.

In the present embodiment, as shown in fig. 1, the display 10 and the holographic display element 30 are disposed in the first space S1 on the side of the transflective element 20, the second space S2 on the side of the transflective element 20 away from the display 10 forms the holographic image IM, and the first space S1 and the second space S2 are the two side spaces of the transflective element 20, respectively; at this time, the user whose eyes are located in the second space S2, in particular, the space on the side of the holographic image IM remote from the transflective element 20 can observe and touch the real image; the observation range is the space region surrounded by the light rays at the peripheral edge of the display 10 after passing through the transflective element 20, the holographic display element 30 and the transflective element 20 and converging to form the holographic image IM.

In this embodiment, the vehicle-mounted holographic display device is disposed in an interior space of a motor vehicle, the interior space of the motor vehicle includes a space formed in a vehicle, and further includes a space inside a vehicle shell, such as a space under an instrument desk, for example, the vehicle-mounted holographic display device may be disposed at least one of a console box, a seat back, or an instrument desk of the motor vehicle, and may be embedded in the space under the instrument desk, so as to ensure that the holographic image IM is formed on the instrument desk, and at this time, a person in the vehicle may not see the vehicle-mounted holographic display device itself, but only see the holographic image IM above the instrument desk and floating in the air, and the sensory experience is excellent.

The embodiment of the application provides a vehicle-mounted holographic display device, through setting up display 10, transflective element 20 and holographic display element 30, vehicle-mounted holographic display device compact structure easily installs and sets up in motor vehicle inner space to show the holographic image IM including contents such as driving information, driving assistance, can show promotion and richen drive experience, brought brand-new formation of image bandwagon effect.

On the basis of the above-mentioned embodiments of the present application, as shown in fig. 2 and 3, the vehicle-mounted holographic display device further includes a storage case 40, the storage case 40 includes a storage space and an opening, the display 10, the transflective element 20 and the holographic display element 30 are disposed in the storage space, the holographic image IM is formed outside the opening, specifically, the transflective element 20 may be disposed at the opening or at a position near the inside of the opening, and the display 10 and the holographic display element 30 are disposed in the storage space inside the opening, so as to ensure that the light forming the holographic image IM can smoothly exit from the storage case 40 without being blocked.

Alternatively, the receiving case 40 may have any desired shape, such as a square, a rectangular parallelepiped, a spherical shape, or a prismatic shape; in a more preferred embodiment, as shown in fig. 3, the hologram IM is represented by a dashed box including the display ABCD, the receiving case 40 is a rectangular parallelepiped and/or a square, and the transflective element 20 is disposed at the outlet of the receiving case 40; moreover, the storage case 40 may further be made of a light-tight material, such as dark resin, plastic, or light-tight metal, so as to avoid the influence of external light on the holographic imaging process, and prevent the user from directly seeing the components inside the vehicle-mounted holographic display device, thereby improving the use experience.

In the embodiment of the application, the accommodating shell 40 is arranged to facilitate the installation and arrangement of the display 10, the transflective element 20, the holographic display element 30 and other elements, and facilitate the disassembly and assembly of the whole device; further adopt the material of adiacticity to make simultaneously and accomodate casing 40, still can avoid external light to holographic imaging's influence and improve and use experience.

On the basis of the above-mentioned embodiments of the present application, as shown in fig. 4, the vehicle-mounted holographic display device further includes a fixing device 50, wherein the fixing device 50 fixedly mounts the storage housing 40 in the interior space of the motor vehicle; by additionally arranging the fixing device 50, the vehicle-mounted holographic display device can be fixed at the use position of the vehicle-mounted holographic display device, and potential safety hazards caused by sliding, moving or shaking of the device in the driving process of a motor vehicle are avoided.

Alternatively, the fixing device 50 may be disposed at any position of the bottom, side or opening of the receiving case 40 as long as the hologram imaging light is not blocked or affected; the fixing device 50 includes a mechanical mechanism such as a snap-in member, a rivet member, or a locking member (e.g., a screw locking member) that is convenient to assemble and disassemble; the fixture 50 may also include stable structures such as welds, adhesives, etc.; the fixing device 50 may adopt a plurality of fixing structures at the same time, which is not limited in this embodiment.

Under different users or different use scenes, different requirements are required for the position of the holographic image IM, and the holographic image IM needs to be adjusted by adjusting the position of the vehicle-mounted holographic display device, for example, under the condition that the heights of drivers are different, the holographic image IM formed by observing the vehicle-mounted holographic display device at the same position may not be completely observed under certain conditions; for example, a rear row or additional passengers want to orient the vehicle-mounted holographic display device towards themselves for better viewing; for example, in some vehicle models, the space at the instrument desk or the armrest box is small, and it is expected that the vehicle-mounted holographic display device can be hidden downward during non-use.

Furthermore, the fixing device 50 further comprises at least one of a lifting mechanism, a rotating mechanism or a translation mechanism, and when the accommodating shell 40 is fixed, the device can be driven to integrally carry out at least one adjustment mode of lifting, rotating or translating, so that the use experience of the vehicle-mounted holographic display device is further improved; through further setting up elevating system, rotary mechanism or translation mechanism, the user can adjust the position, angle and the height etc. of device according to the use habit, further promotes the application scope and the use experience of device.

Optionally, the lifting mechanism comprises at least one of a rocker, a lead screw, a pulley block, a hydraulic/pneumatic lifting structure, a gear set lifting structure or a worm and gear lifting structure; the rotating mechanism comprises at least one of a spiral rotating mechanism, a cam rotating mechanism, a crank rotating mechanism, a holder or a rotating shaft rotating structure; the translation mechanism comprises at least one of a sliding rail sliding block mechanism, a gear transmission mechanism or a gear rack transmission mechanism, and the mechanism can be driven by power (for example, manual driving or mechanical driving) to adjust the holographic display device, so that the adjustment of the position of the holographic image IM is realized.

In the embodiment of the application, the fixing device 50 is arranged, so that the device can be fixed in a motor vehicle, and potential safety hazards caused by vehicle driving are avoided; meanwhile, by further arranging a lifting mechanism, a rotating mechanism or a translation mechanism in the fixing device 50, the position, the angle and the like of the device can be further adjusted, the state of the holographic image IM is further adjusted, and the application range and the application experience of the vehicle-mounted holographic display device in the embodiment of the application are further improved.

In addition to the above embodiments of the present application, as shown in fig. 5, the vehicle-mounted holographic display device further includes a controller 60, the display 10 is electrically connected to the controller 60 (indicated by a double arrow in fig. 5), and the controller 60 controls the display 10 to display an image, thereby controlling the vehicle-mounted holographic display device to display a holographic image. Specifically, the controller 60 may be disposed inside the storage housing 40 and control the display 10 to display an image, for example, the controller 60 may be a hard-soft combined board, a Central Processing Unit (CPU), or a control chip, for example, if the controller 60 controls the display 10 to display driving assistant content, the vehicle-mounted holographic display device may display a holographic image IM including corresponding content; the controller 60 may not be disposed inside the storage housing 40, for example, the controller 60 may be a car machine, an Advanced Driving Assistance System (ADAS) of a car, and is electrically connected to the display 10 in a wireless or wired manner by USB, OBD or bluetooth, etc., so as to transmit the content to be displayed, such as driving information, to the display 10, the display 10 displays the corresponding content, and the on-board holographic display device forms a corresponding holographic image IM for the driver and/or passenger to view; or, the controller 60 may also be other electronic devices in the vehicle, for example, an electronic device such as a mobile phone or a computer of a driver and/or a passenger, which is wirelessly or wiredly connected to the display 10 in a USB or bluetooth manner, and transmits the content to be displayed to the display 10, the display 10 displays the corresponding content, and the vehicle-mounted holographic display device forms a corresponding holographic image IM for the vehicle-mounted people to watch; by providing the controller 60, it is possible to control the operation (displaying the hologram image IM) and the non-operation state (not displaying the hologram image IM) of the in-vehicle hologram display device, and also to control the display content of the hologram image IM.

Further, the vehicle-mounted holographic display device further comprises a collector, wherein the controller 60 and the display 10 are electrically connected with the collector, and the collector is used for collecting at least one of key information, voice information and image information in the motor vehicle. For example, the collector comprises touch or key equipment for collecting touch or key information of people in the vehicle; for example, the collector comprises a voice collecting device such as a microphone and the like, and collects voice information of people in the vehicle; for example, the collector comprises an infrared image collecting device, a visible light image collecting device and the like, and collects gesture information of people in the vehicle; and transmits the information to the controller 60 in a wired or wireless manner, and the controller 60 processes and feeds back the information, so as to facilitate the next operation of the personnel in the vehicle.

For example, in an implementation manner of this embodiment, a person in the vehicle sends a voice command of "close the holographic image", the collector collects and sends the voice command to the controller 60, and the controller 60 controls the display 10 to close, so that the holographic image IM is no longer displayed at this time.

For example, in another implementation manner of this embodiment, a person in the vehicle touches a video icon on the holographic image IM, a collector (e.g., an infrared touch collector) collects and sends the video icon to the controller 60, and the controller 60 controls the display 10 to display video content; or, the holographic image IM displays the driving assistant, the vehicle interior person touches the driving assistant on the holographic image IM, the collector (e.g., an infrared touch collector) collects and sends the collected data to the controller 60, and the controller 60 controls the display 10 to display the driving assistant after the corresponding touch, for example, the driving assistant calls the vehicle interior person.

In the embodiment of the application, the controller 60 is arranged to control the state of the vehicle-mounted holographic display device, so that the use by a user is facilitated; and a collector is further arranged, gesture instructions or voice instructions of a user in the vehicle can be collected and fed back, the display state of the holographic image IM is adjusted, and the practicability of the vehicle-mounted holographic display device is further improved.

On the basis of the above embodiments of the present application, as shown in fig. 6, the vehicle-mounted holographic display device further includes a sound box 70, where the sound box 70 is electrically connected to the controller 60 to control the sound box 70 to emit sound. Alternatively, the sound box 70 may be disposed in the storage case 40, as shown in fig. 6, so that the integrated device is more convenient to use and disassemble; the sound box 70 may also be a sound box of a motor vehicle or a sound box of other electronic devices (e.g., mobile phone, computer) in the vehicle. The sound box 70 can be matched with the display content of the display 10 to emit sound while displaying images, so that the use experience can be further improved; for example, the display 10 displays driving assistant information, at this time, the holographic image IM also displays corresponding information, and the sound box 70 sends corresponding voice information, such as vehicle speed, weather or danger warning information in the broadcast display content, to assist in reminding in a voice form, so as to further improve the use effect and use experience of the vehicle-mounted holographic display device.

On the basis of the above-mentioned embodiments of the present application, as shown in fig. 1, the display 10 is perpendicular to the transflective element 20, and the angle α between the holographic display element 30 and the transflective element is 20 to 60 °; specifically, the angle formed by the display 10 and the transflective element 20, and the angle formed by the holographic display element 30 and the transflective element 20, refer to the angle formed by the elements directly or the angle formed by the extension lines of the elements; the display 10 is perpendicular to the transflective element 20, without limiting the angle between the two to be 90 °, in particular in the interval 90 ° ± 10 °; the angle a between the holographic display element 30 and the transflector element 20 may be 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, or 60 °.

In this embodiment, because the display 10 and the holographic image IM are symmetric about the transflective element 20 (specifically, the side of the display 10 on which the image is formed), and thus the display 10 is perpendicular or nearly perpendicular to the transflective element 20, the holographic image IM is also perpendicular or nearly perpendicular to the transflective element 20, and the perpendicular holographic image IM is convenient for viewing. In a preferred embodiment, the angle α is 25 ° to 35 °, and may be 30 °, since the user is generally in a sitting posture when using the vehicle-mounted holographic display device, the observation effect of the holographic image IM is better when the user's eyes, the holographic image IM (e.g., the center of the holographic image IM) and the holographic display element 30 (e.g., the center of the holographic display element 30) are on or close to the same straight line, and when the angle α is close to or 30 °, the two eyes and the above-mentioned elements are on or close to the same straight line, and the observation effect of the holographic image IM is better in combination with the factors of the average height of the crowd, the ergonomics, and the average height of the vehicle seat.

In addition to the above embodiments of the present application, as shown in fig. 7a, 7b and 7c, the transflective element 20 includes a transparent substrate 201, a transflective film 202 and an absorbing film 203, wherein the absorbing film 203 is disposed on a side of the transflective film 202 away from the display 10; the transflective film 202 is used for reflecting light emitted from the display 10 and transmitting light emitted from the holographic display element 30; the absorption film 203 is used to absorb light emitted from the non-holographic display element 30.

In this embodiment, the transparent substrate 201 includes a plate made of glass, quartz, transparent polymer, and the like, and mainly plays a role in supporting; the transflective film 202 and the absorption film 203 comprise an inorganic dielectric film layer or an organic polymer film layer, and can be disposed on the surface of the transparent substrate 201 by plating or bonding, when the transflective film 202 is plated or bonded, the transflective film 202 and the transparent substrate 201 should be regarded as a whole, and mainly the transflective film 202 transmits and reflects light. The absorption film 203 is used for absorbing the light emitted from the non-holographic display element 30, and since the holographic display element 30 can change the properties of the light in addition to the emitted light, the properties of the light emitted from the display 10 to the transflective element 20 are different from the properties of the light emitted from the holographic display element 30 to the transflective element 20, and the absorption film 203 absorbs the other light except the light emitted from the holographic display element 30; therefore, the absorbing film 203 is disposed on the side of the transflective film 202 away from the display 10 to ensure reflection of image light emitted from the display 10 on the transflective film 202.

As shown in fig. 7a, the absorption film 203 is attached to the outer side of the transparent substrate 201 far away from the display 10, and the transflective film 202 is attached to the inner side of the transparent substrate 201 near the display 10; as shown in fig. 7b, the absorption film 203 and the transflective film 202 are both attached to the inner side of the transparent substrate 201 close to the display 10, and meanwhile, the absorption film 203 is far away from the display 10 compared to the transflective film 202, and the film layers are both arranged on the inner side, so that the damage to the film layers from the outside, such as scraping, bumping and the like, can be avoided; as shown in fig. 7c, the absorption film 203 and the transflective film 202 are both attached on the outer side of the transparent substrate 201 away from the display 10, and the absorption film 203 is away from the display 10 compared to the transflective film 202; it should be understood that in fig. 7a, 7b and 7c, for the convenience of explanation, there is a certain gap between each film layer and the substrate, but it does not mean that there must be a gap between the elements; in practical application, gaps exist among the elements or the elements are tightly attached, and under the condition of convenient implementation, the elements are tightly attached.

Specifically, the inorganic dielectric film layer may be a single film layer or a stack of a plurality of film layers, the components of the film layers are selected from metal oxides, metal nitrides, metal oxynitride coating films, and fluorides, which may be one or more of tantalum pentoxide, titanium dioxide, magnesium oxide, zinc oxide, zirconium oxide, silicon dioxide, magnesium fluoride, silicon nitride, silicon oxynitride, and aluminum fluoride; the organic polymer film layer can be a single organic film layer or a plurality of organic film layers which are superposed and selected from organic polymers with thermoplasticity; the thickness of each film is 1-100nm, and the films have different optical properties, such as light transmittance and reflection properties, and/or light absorption properties, due to different materials, different stacking sequences and different thicknesses.

In one embodiment of the present embodiment, the transflective film 202 comprises a polarizing transflective film, and the absorbing film 203 comprises a polarizing absorbing film; the image light emitted by the display 10 includes polarized light, such as linearly polarized light, circularly polarized light, or elliptically polarized light. When the transflective film 202 is a polarizing transflective film, light of a first polarization state is reflected and light of a second polarization state is transmitted, and the first polarization state is perpendicular to the second polarization state; the transflective film 202 is specifically understood to have a high reflectance for light of a first polarization and a high transmittance for light of a second polarization, such as an average reflectance of the transflective film 202 for light of the first polarization of greater than 50%, preferably greater than 70%, or even greater than 90%, and an average transmittance for light of the second polarization of greater than 50%, preferably greater than 70%, or even greater than 90%. Meanwhile, when the absorbing film 203 is a polarization absorbing film, it matches the polarization transflective property of the transflective film 202, for example, when the transflective film 202 reflects the light of the first polarization state and transmits the light of the second polarization state, the absorbing film 203 transmits the light of the second polarization state and absorbs the light of the non-second polarization state (including at least the light of the first polarization state).

In a preferred embodiment, the first polarized light and the second polarized light are linearly polarized light, the image light emitted from the display 10 including the first polarized light is reflected by the transflective film 202, the polarization state of the reflected light is hardly changed, the first polarized light is emitted to the holographic display element 30, the holographic display element 30 emits the light in the opposite direction to the incident direction, and the polarization state of the light is changed to the second polarized light, and the transflective film 202 transmits the second polarized light; the absorbing film 203 only transmits the second linearly polarized light, and the light with incompletely converted polarization property or the omitted first linearly polarized light is absorbed by the absorbing film 203, so that only the light with the second linearly polarized light and the light with the holographic image IM formed thereon are transmitted as far as possible, and the observation of the holographic image IM is prevented from being influenced by glare, ghost and the like caused by the light with the other polarized light.

In another preferred embodiment, a display 10 emitting light of a first polarization state in a specific wavelength band may be selected, and the transflective film 202 is configured to have a high reflectance with respect to light of the first polarization state in the specific wavelength band and a high transmittance with respect to light of the first polarization state in other wavelength bands and light of a second polarization state in a visible light wavelength band. For example, the average reflectivity of the transflective film 202 for P-polarized light in the specific wavelength band is greater than 80%, or even greater than 90%, while the average transmissivity for S-polarized light in other wavelength bands and S-polarized light in the visible wavelength band is greater than 80%, or even greater than 90%; the specific wavelength range may be, for example, red light having a central wavelength of 590nm to 690nm, green light having a central wavelength of 500nm to 565nm, or blue light having a central wavelength of 410nm to 480 nm.

In the embodiment of the application, by arranging the transparent substrate 201, the transflective film 202 and the absorption film 203, and attaching and mounting the transflective film 202 and the absorption film 203 through the supporting effect of the transparent substrate 201, the image light emitted by the display 10 is reflected by the transflective film 202 as much as possible, so that the light utilization rate is improved, and the brightness and the definition of the holographic image IM are further improved; meanwhile, stray light except the light forming the holographic image IM is absorbed by the absorption film 203, so that the phenomena of glare, ghost shadow and the like are avoided, and the viewing experience of the holographic image IM is improved.

On the basis of the above-described embodiment of the present application, as shown in fig. 8, the holographic display element 30 includes a retro-reflection element 301 and a phase retardation element 302, the phase retardation element 302 is disposed between the retro-reflection element 301 and the transflective element 20, the retro-reflection element 301 is configured to propagate a light ray incident thereto in a direction opposite to the incident direction, and the phase retardation element 302 is configured to change the phase of the light ray passing therethrough.

In this embodiment, the retro-reflective element 301 can emit the light incident thereon in the opposite direction of the incident direction, the phase retardation element 302 is disposed between the retro-reflective element 301 and the transflective element 20, and the phase retardation element 302 is used for changing the phase of the light passing therethrough. Specifically, after the light emitted from the display 10 is reflected by the transflective element 20, the reflected light includes light in a first polarization state, and the phase of the light changes as the polarization state of the light changes when the light in the first polarization state passes through the phase retarder 302; the light continuously propagates to the back reflection element 301, exits along the opposite direction of the incident direction, passes through the phase delay element 302 again, the polarization state of the light is changed again, and is converted into light in a second polarization state, the light in the second polarization state exits to the transflective element 20 and is transmitted, and the transmitted light forms a holographic image IM; optionally, phase delay element 302 comprises a waveplate.

Optionally, the holographic display element 30 further includes a substrate made of metal, plastic, or the like, and having a supporting function, and the retroreflective element 301 and the phase retardation element 302 are sequentially disposed on the substrate, so as to facilitate the assembly and disassembly of the holographic display element 30.

In a preferred embodiment, the retroreflective element 301 has an arc curved towards the transflective element 20, i.e. the center of the curved retroreflective element 301 is further away from the transflective element 20 than the center of the non-curved retroreflective element 301; the retro-reflection element 301 is bent toward the transflective element 20, when the transmitted image light beams passing through the transflective element 20 at different angles are incident on the retro-reflection element 301, due to the different incident angles of the different regions, the regions with larger incident angles, such as the light beams at the edge of the retro-reflection element 301, have lower retro-reflection efficiency, the bent retro-reflection element 301 is beneficial to reducing the incident angle of the incident light beams on the retro-reflection element 301, and the smaller the angle, the better the retro-reflection effect, the higher the imaging brightness of the holographic image IM.

In a preferred embodiment, the display 10 is a display device that can emit light including a first linearly polarized light, such as a liquid crystal display that emits polarized light (e.g., the first linearly polarized light), or a light emitting diode display that emits unpolarized light (including the first linearly polarized component); the phase retardation element 302 is an 1/4 wave plate, and can be disposed on the side of the retro-reflection element 301 close to the transflective element 20 by being attached or kept at a certain distance; the transflective Film 202 is an optical element that can reflect the first linearly polarized light while transmitting the second linearly polarized light, and is, for example, a commercially available BEF Film (Brightness Enhancement Film) or DBEF Film (Dual Brightness Enhancement Film). The display 10 emits image light comprising a first linear polarization state, which may be in particular P-polarized light, and a second linear polarization state, which may be in particular S-polarized light, the transflective element 20 reflects the P-polarized light and transmits the S-polarized light, the transflective element 20 having an average reflectivity for the P-polarized light of more than 70%, preferably more than 80%, even more than 90%, and an average transmission for the S-polarized light of more than 70%, preferably more than 80%, even more than 90%. After the P-polarized light is reflected by the transflective element 20, the reflected light is still P-polarized light, the light is converted into circularly polarized light after being transmitted and passing through the phase delay element 302, and the circularly polarized light continues to be transmitted to the retro-reflective element 301 and is emitted in the opposite direction of the incident direction, and still is circularly polarized light; the circularly polarized light passes through the phase delay element 302 again and is converted into second linearly polarized light, the polarization direction of the second linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light, that is, when the first linearly polarized light is P-polarized light, the light passes through the 1/4 wave plate twice and is converted into S-polarized light in the second linearly polarized state, and the S-polarized light is emitted to the transflective element 20 and then is transmitted to the second space S2, so as to form a holographic image IM; the first linearly polarized light may also be S-polarized light, and the second linearly polarized light may also be P-polarized light, and the implementation manner is similar to the above process and is not described in detail again.

It should be noted that the position of the phase retardation element 302 in the embodiment of the present application may be set according to the actual situation, for example, it may have a certain interval with the retroreflective element 301, or it may be directly set on the surface of the retroreflective element 301, i.e. attached in contact with the surface of the retroreflective element 301, so as to reduce the interference of the air layer between the phase retardation element 302 and the retroreflective element 301, increase the amount of light passing through the phase retardation element 302, further increase the light efficiency, and brighten the holographic image IM.

In this embodiment, the retroreflective element 301 includes a substrate 3011 and a plurality of retroreflective microstructures distributed on the substrate 3011, and the retroreflective microstructures reflect incident light once or more on the retroreflective microstructures to achieve a retroreflective effect, as shown in fig. 9 and 10. Therefore, in order to ensure high retroreflective efficiency, the retroreflective element 301 is further provided with a high reflective coating 3012, the high reflective coating 3012 is disposed in the area where the retroreflective microstructure is connected to the substrate 3011 and reflects, and the reflectivity of the high reflective coating 3012 is more than 60%, preferably more than 70%, 80% or 90%, and may be provided by plating, bonding or integral molding; the highly reflective coating 3012 can improve the efficiency of light reflecting on the retro-reflective microstructure each time, thereby improving the retro-reflective efficiency. It is understood that the back reflection efficiency is determined by one or more reflections of the light on the back reflection, which can be simply regarded as the product of the multiple reflectivities, and thus the back reflection efficiency can be improved by increasing the reflectivity of the light on the back reflection microstructure for each reflection.

In this embodiment, the retro-reflective microstructures include at least one of a solid transparent right-angle vertex microstructure, a solid transparent spherical microstructure, or a hollow recessed right-angle vertex microstructure distributed on the surface of the substrate 3011, the positions and implementations of the substrate 3011 and the highly reflective coating 3012 may be different according to the retro-reflective microstructures of different implementations, and the highly reflective coating 3012 may be attached to a surface of the retro-reflective microstructure facing toward or away from the substrate 3011 or an area where the retro-reflective microstructure and the substrate 3011 are connected.

In an embodiment of the present invention, the retroreflective element 30 includes a substrate 3011 and microstructures distributed on the surface of the substrate 3011, a high reflective coating 3012 is disposed on the surface of the microstructures of the solid transparent material contacting the substrate 3011, fig. 9a shows a side view of the retroreflective element 301 including the spherical retroreflective microstructures 320 of the solid transparent material, the retroreflective element 301 includes the substrate 3011, a plurality of spherical microstructures 3013 of the solid transparent material are distributed on the surface of the substrate 3011, and the high reflective coating 3012 is disposed on the surface of the spherical microstructures 3013 of the solid transparent material contacting the substrate 3011. When light enters the retroreflective element 301, the light is refracted into the solid transparent spherical microstructure 3013 and is reflected on the highly reflective coating 3012 at the junction between the solid transparent spherical microstructure 3013 and the substrate 3011, and the reflected light is refracted out of the solid transparent spherical microstructure 3013 and exits in the direction opposite to the incident light. Or, the solid transparent spherical microstructure 3013 further includes an ellipsoid-shaped microstructure, and the process of realizing the back reflection of the light beam at the ellipsoid-shaped microstructure is similar to the above process, and is not described again, and the back reflection efficiency of the ellipsoid-shaped microstructure is slightly lower than that of the spherical microstructure.

Figure 9b shows a side view of a retroreflective element 301 that includes a solid transparent right triangular pyramidal right angle apex microstructure 3014. The retro-reflection element 301 comprises a substrate 3011, the substrate 3011 is a light-transmitting structure, a plurality of solid transparent right-angled triangular pyramid vertex microstructures 3014 are distributed on the surface of the substrate 3011, a high-reflection coating 3012 is arranged on the surface of the solid transparent right-angled triangular pyramid right-angled vertex microstructures 3014, which is far away from the substrate 3011, and specifically, the high-reflection coating 3012 is arranged on three mutually perpendicular right-angled triangular surfaces of the solid transparent right-angled triangular pyramid. When light enters the retroreflective element 301, the light is firstly refracted into the substrate 3011 and is transmitted to the inside of the solid transparent right-angled triangular pyramid right-angled vertex microstructure 3014 through the substrate 3011, three times of reflection occurs at three mutually perpendicular right-angled triangular faces of the solid transparent right-angled triangular pyramid right-angled vertex microstructure 3014, and the reflected light is refracted out of the retroreflective element 301 and is emitted in the direction opposite to the incident light; the retroreflective element 301 including the solid transparent right-angled triangular pyramid vertex microstructure 3014 has very high front retroreflective efficiency, but when the incident light angle is large, the retroreflective efficiency is greatly attenuated.

Figure 9c shows a side view of retroreflective element 301 comprising an isosceles triangular pyramidal right angle apex microstructure 3015 of solid transparent material. The retro-reflection element 301 comprises a substrate 3011, the substrate 3011 is a light-transmitting structure, a plurality of solid isosceles triangular pyramid right-angle vertex microstructures 3015 made of transparent materials are distributed on the surface of the substrate 3011, the solid isosceles triangular pyramid right-angle vertex microstructures 3015 made of transparent materials are provided with high-reflection coatings 3012 on the surface, deviating from the substrate 3011, of the solid isosceles triangular pyramid right-angle vertex microstructures 3015 made of transparent materials, and specifically, the high-reflection coatings 3012 are provided on three mutually-perpendicular triangular surfaces of the solid isosceles triangular pyramid made of transparent materials. When light enters the retroreflective element 301, the light is first refracted into the substrate 3011 and then propagates through the substrate 3011 to the inside of the solid transparent isosceles triangular pyramid right-angle vertex microstructure 3015, and three reflections occur at three mutually perpendicular triangular surfaces of the solid transparent isosceles triangular pyramid right-angle vertex microstructure 3015, and the reflected light is refracted out of the retroreflective element 301 and exits in the direction opposite to the incident light. The front retroreflection efficiency of the retroreflective element 301 including the solid transparent isosceles triangular pyramid right-angle apex microstructure 3015 is lower than the retroreflective element 301 including the solid transparent isosceles triangular pyramid right-angle apex microstructure 3014, but the retroreflection efficiency is not greatly attenuated when the incident light angle is large.

Figure 9d shows a side view of the retroreflective element 301 that includes a cube-cone right angle apex microstructure 3016 of solid transparent material. The retroreflective element 301 includes a substrate 3011, the substrate 3011 is a light-transmitting structure, a plurality of solid transparent cubic cone right-angle vertex microstructures 3016 are distributed on the surface of the substrate 3011, a high-reflection coating 3012 is disposed on a surface of the solid transparent cubic cone right-angle vertex microstructures 3016 away from the substrate 3011, and specifically, the high-reflection coating 3012 is disposed on three mutually perpendicular cubic surfaces of the solid transparent cubic cone. When light enters the retroreflective element 301, the light is first refracted into the substrate 3011 and first propagates through the substrate 3011 to the interior of the solid transparent cubic cone right-angle vertex microstructure 3016, and three reflections occur at three mutually perpendicular cubic surfaces of the solid transparent cubic cone right-angle vertex microstructure 3016, and the reflected light is refracted out of the retroreflective element 301 and exits in the direction opposite to the incident light.

In another embodiment of this embodiment, the retroreflective element 301 includes a substrate 3011 and a hollow-recessed right-angle apex microstructure disposed on the substrate 3011, and the high-reflectivity coating 3012 is disposed on the recessed surface of the hollow-recessed right-angle apex microstructure facing away from the substrate 3011. Fig. 10a shows a side view of a retroreflective element 301 comprising a hollow-recessed right-angled triangular pyramid vertex microstructure 3017, the retroreflective element 301 comprises a substrate 3011, a plurality of hollow-recessed right-angled triangular pyramid vertex microstructures 3017 are distributed on the surface of the substrate 3011, a highly reflective coating 3012 is disposed on a recessed surface of the right-angled triangular pyramid vertex microstructure 3017 facing away from the substrate 3011, and particularly, highly reflective coatings 3012 are disposed on three mutually perpendicular right-angled triangular surfaces of the right-angled triangular pyramid. When light enters the retroreflective element 301, the light is transmitted to the inside of the hollow recessed right-angled triangular pyramid vertex microstructure 3017, three times of reflection occurs at three mutually perpendicular right-angled triangular faces of the hollow recessed right-angled triangular pyramid right-angled vertex microstructure 3017, and the reflected light is emitted in a direction opposite to the incident light; the retroreflective element 301 comprising the hollow-depressed right-angled triangular pyramid apex microstructure 3017 has very high front retroreflection efficiency, but has a large attenuation of the retroreflection efficiency at large incident light angles.

Figure 10b shows a side view of a retroreflective element 301 comprising a hollow recessed isosceles triangular pyramidal right angle apex microstructure 3018. The retroreflective element 301 includes a substrate 3011, a plurality of hollow recessed isosceles triangular pyramid right-angle vertex microstructures 3018 are distributed on the surface of the substrate 3011, a highly reflective coating 3012 is disposed on a recessed surface of the hollow recessed isosceles triangular pyramid right-angle vertex microstructures 3018 departing from the substrate 3011, and particularly, highly reflective coatings 3012 are disposed on three mutually perpendicular triangular surfaces of the hollow recessed isosceles triangular pyramid. When light enters the retroreflective element 301, the light is transmitted to the inside of the hollow recessed isosceles triangular pyramid right-angle vertex microstructure 3018, three reflections occur at three mutually perpendicular triangular surfaces of the hollow recessed isosceles triangular pyramid right-angle vertex microstructure 3018, and the reflected light is emitted in a direction opposite to the incident light; the retroreflective element 30 comprising the hollow recessed isosceles triangular pyramid right-angle apex microstructure 3018 has a front retroreflection efficiency that is lower than that of the hollow recessed isosceles triangular pyramid microstructure 3017, but the retroreflection efficiency is not significantly attenuated when the incident light angle is large.

Figure 10c shows a side view of retroreflective element 301 that includes a hollow-recessed cube-cone right-angle apex microstructure 3019. The retroreflective element 301 includes a substrate 3011, a plurality of hollow recessed cube-pyramid right-angle apex microstructures 3019 are distributed on the surface of the substrate 3011, and a highly reflective coating 3012 is disposed on a recessed surface of the hollow recessed cube-pyramid right-angle apex microstructures 3019 facing away from the substrate 3011, specifically, highly reflective coatings 3012 are disposed on three mutually perpendicular cube surfaces of the hollow recessed cube-pyramid. When light is incident on the retroreflective element 301, the light propagates inside the hollow recessed cube-corner vertex micro-structure 3019 and is reflected three times at three mutually perpendicular cube faces of the hollow recessed cube-corner vertex micro-structure 3019, and the reflected light exits in a direction opposite to the incident light.

The vehicle-mounted holographic display device provided by the embodiment of the application can change the property of light rays while reflecting the light rays by arranging the back reflection element 301 and the phase delay element 302, so that the light rays as much as possible can penetrate through the transflective element 20 to form the holographic image IM, and the light ray utilization rate and the brightness of the holographic image IM are improved.

On the basis of the above embodiments of the present application, the vehicle-mounted holographic display device further includes a peep-proof film, which is disposed on the light exit surface side of the display 10 and used for blocking light rays at a predetermined angle; when the vehicle-mounted holographic display device is used, people in a motor vehicle can see the holographic image IM, but if the images directly formed by the display 10 can be seen, the observation of the holographic image IM is influenced, and the use experience is reduced. Therefore, in the embodiment, the peep-proof film is arranged to block the image light rays which can be directly received by the user, and the visual angle of the image light rays emitted by the display 10 is limited, so that personnel in the motor vehicle can only observe the holographic image IM, and the using effect of the vehicle-mounted holographic display device is improved; optionally, the privacy film comprises any privacy function enabling element of the prior art, such as a privacy grating.

On the basis of the above embodiments of the present application, the display effect of the holographic image IM can also be improved by improving the display effect of the display 10, for example, the brightness and uniformity of the picture; as shown in fig. 11, the display 10 includes: a light source 101, a reflection cup 102, a diffusion film 103, and a liquid crystal panel 104; light emitted by the light source 101 is reflected by the reflecting cup 102 and emitted to the diffusion film 103, the light is diffused by the diffusion film 103, the diffused light is emitted to the liquid crystal screen 104, and the liquid crystal screen 104 displays an image and emits image light.

In this embodiment, the light emitted from the light source 101 may be a point light source, a line light source or a surface light source, and the number of the light sources 101 may be one or more, which is not limited; the Light source 101 includes at least one electroluminescent element, which generates Light by electric Field excitation, including but not limited to Light Emitting Diodes (LEDs), Organic Light Emitting Diodes (OLEDs), Mini Light Emitting diodes (Mini LEDs), Micro LEDs (Micro LEDs), Cold Cathode Fluorescent Lamps (CCFLs), Cold Light sources (Cold LEDs Light, CLL), Electro Luminescence (EL), electron Emission (FED), or Quantum Dot Light Sources (QDs).

In this embodiment, because the light emitted by the light source 101 has a certain divergence angle, the light with a larger divergence angle, for example, the light with a divergence angle larger than 15 °, 20 °, 30 °, 45 °, 60 °, or 75 °, is emitted all around, and finally is difficult to reach the liquid crystal panel 104 for imaging; as shown in fig. 11, the reflection cup 102 is arranged to reflect the part of the light with a large divergence angle, so that the light is gathered to the center, and the light utilization rate is improved. Specifically, the reflective cup 102 is disposed in the light emitting direction of the light source 110, and the reflective cup 102 includes a hollow shell with an internal reflection surface; the hollow shell comprises a light outlet 1021 and a port 1022, the light source 101 is arranged at the port 1022 of the hollow shell, another part of light emitted by the light source 110 is transmitted and emitted in the transmission channel of the hollow shell, and after another part of light with larger divergence angle is reflected on the internal reflection surface, the light is gathered to the center and emitted through the light outlet 1021; specifically, the size of the port 1022 is smaller than that of the light outlet 1021, and the internal reflection surface of the hollow shell includes an internal reflection surface formed by aluminum plating, silver plating, other metal plating or a dielectric film plating, and light can be specularly reflected on the internal reflection surface. By arranging the reflection cup 102, the large-angle light emitted by the light source 101 is reflected on the internal reflection surface of the hollow shell, the angle of the reflected light is changed and gathered to the center, the utilization rate of the light emitted by the light source 110 can be improved, and the brightness of the holographic image IM is further improved.

Optionally, the shape of the light outlet 1021 includes at least one of a circle, an ellipse, a rectangle, a trapezoid, a parallelogram, or a square; the shape of the port 1022 includes at least one of a circle, an ellipse, a rectangle, a trapezoid, a parallelogram, or a square; the light outlet 1021 and the port 1022 may have the same or different shapes.

Optionally, the hollow shell may specifically include at least one of a parabolic shape, a conic shape, or a free-form surface shape, and the shape of the hollow shell specifically refers to the shape of the internal reflection surface; it is understood that the shape of the hollow shell may be different from the shape of the internal reflection surface, as long as the internal reflection surface is the shape that can reflect light rays; for convenience of explanation in the embodiment of the present application, the shape of the hollow shell is consistent with that of the internal reflection surface.

In an alternative embodiment of this embodiment, the hollow housing has a rectangular frustum shape, and one or more light sources 101 may be disposed at the port 1022, as shown in fig. 12a and 12b, when the display 10 includes a plurality of light sources 101, the light sources 101 are arranged in a matrix, and a plurality of corresponding reflective cups 102 are also arranged in a matrix, for example, the light sources 101 of the display 10 include 64 LED light beads, the light beads are arranged in an array of 8 × 8, and the reflective cups 102 may be 64 light beads arranged in an array of 8 × 8; alternatively, a plurality of beads, for example, 4 beads, are disposed in each reflector cup 102, and the reflector cups may be arranged in a 4 × 4 array.

In another embodiment of this embodiment, or, the hollow housing includes a long prism shape, the port 1022 may be provided with a plurality of light sources 101 arranged linearly, which is convenient for disassembly, assembly and replacement, as illustrated by a row of light sources 101 arranged linearly in fig. 13, or may include a plurality of rows of light sources 101 arranged linearly, when the display 10 includes a plurality of light sources 101, the light sources 101 are arranged in a matrix, the plurality of reflective cups 102 are also arranged sequentially, each reflective cup 102 corresponds to one or more rows of light sources, for example, the display 10 includes 32 LED lamp beads as the light sources 101, the 32 lamp beads are arranged in an array of 8 × 4, and each row of 8 LED lamp beads corresponds to one reflective cup 102 with a long prism shape; or, a plurality of rows of beads, for example, two rows of beads, are correspondingly provided with a reflective cup 102 in the shape of a long prism.

In an alternative embodiment of this embodiment, as shown in fig. 14, the reflective cup 102 includes an elongated prism shape, and the light outlet of the reflective cup 102 faces the transflective element 20, specifically, an axis of the reflective cup 102 (for example, a connection line between the center of the light outlet 1021 and the port 1022) is directed to the transflective element 20, and an included angle between the axis and the transflective element 20 is close to or equal to α, so that image light emitted from the display 10 faces the transflective element 20, so that as much light as possible is reflected, and the light utilization rate is improved; it should be understood that in fig. 14, the liquid crystal panel 104, the diffusion film 103, and the like are omitted for convenience of explanation.

In this embodiment, through the light after the reflection cup 102 reflection gathering, though gather together to the center and improved the light utilization ratio, nevertheless because the light intensity of light source 101 center department often is stronger, can form obvious bright area and dark space, consequently set up the light diffusion that diffusion barrier 103 will reflect cup 102 outgoing for light evenly distributed. As shown in fig. 11, when the diffusion film 103 is not present, light travels to the liquid crystal panel 104 along the dotted line in fig. 11; when the diffusion film 103 exists, the diffusion film 103 diffuses light into light rays with a plurality of exit angles, two edge light rays with the largest diffusion angle are shown in fig. 11, that is, the diffusion film 103 diffuses light rays within a certain range, so that the uniformity of light ray distribution is improved, the light ray distribution of the final image is more uniform, and the imaging effect of the final holographic image IM is better.

Optionally, in another embodiment, the reflective cup 102, the liquid crystal panel 104 and the diffusion film 103 are sequentially disposed, and light emitted from the light source 101 passes through the reflective cup 102 and then exits to the liquid crystal panel 104 to be converted into image light; the image light is uniformly diffused through the diffusion film 103, and in order to avoid the influence of diffusion on the image quality, the diffusion film 103 needs to be tightly attached to the liquid crystal screen 104.

The diffusion film 103 may be a low-cost scattering optical element such as a light homogenizing sheet or a diffusion sheet. Alternatively, the diffusion film 103 may be a Diffractive Optical Element (DOE) having a good diffusion effect control, such as a Beam Shaper (Beam Shaper); wherein, light can take place the scattering when penetrating scattering optical element such as even light piece, and light can be transmitted to many different angles, still can take place a small amount of diffraction, but the scattering of light plays the main effect, and is great to the diffusion degree of light. The diffraction optical element is provided with a specific microstructure on the surface, the light beam expansion effect is mainly achieved through diffraction, and the size and the shape of the diffused light beam are controllable. Preferably, the light beam transformed by the light beam passing through the diffusion film 103 in the embodiment has a specific shape in the cross section perpendicular to the propagation direction, that is, the diffusion film 103 can diffuse the light beam passing through it to form a light beam with a specific shape, and the shape of the cross section of the light beam after diffusion includes, but is not limited to, a circle, an ellipse, a square or a rectangle.

Alternatively, since the diffusion film 103 is generally a soft film material, for the convenience of installation and use, the diffusion film 103 may be attached to a transparent supporting plate material such as glass, and is convenient to install and set together with other components.

Optionally, the diffusion film 103 has a diffusion angle of 1-30 ° for light in two directions perpendicular to each other; the diffusion angles in the two directions perpendicular to each other may be the same or different.

In this embodiment, the liquid crystal panel 104 includes a TN liquid crystal panel (TN), an STN liquid crystal panel (STN), a TFT liquid crystal panel (TFT), an MIM liquid crystal panel (Metal/Insulator/Metal), etc., and can convert light into an image and emit image light to provide image information; after the light passes through the liquid crystal panel 104, the liquid crystal panel 104 hardly or rarely changes the propagation direction of the light, so that the diffused light passes through the liquid crystal panel 104, and the propagation direction is unchanged and is converted into uniformly distributed image light.

According to the vehicle-mounted holographic display device provided by the embodiment of the application, the reflection cup 102 is arranged, so that light rays with large divergence angles emitted by the light source 101 are gathered, and the utilization rate of the light rays is improved; the diffusion film 103 diffuses light, so that the uniformity of light distribution is improved, and the condition of uneven brightness is avoided when the display 10 displays content; through the cooperation of each component, display 10 light utilization ratio is high, and image brightness is high, and the homogeneity is good, can further promote holographic image IM's display effect.

On the basis of the above-described embodiment of the present application, the number of the diffusion films 103 includes a plurality, and the adjacent diffusion films 103 are spaced apart by a predetermined distance. On the basis of the above embodiments, in practical situations, one diffusion film 103 is adopted to diffuse light once, and a good light uniformity effect cannot be perfectly achieved, for example, a dark area is easily formed at the gaps of the plurality of light sources 101, which is not good enough to make the light distribution uniform. In this embodiment, the uniformity of light distribution is further improved by disposing a plurality of diffusion films 103 at intervals, and the light emitted from the light source 101 can be diffused by the plurality of diffusion films 103, so that the imaging brightness of the liquid crystal screen 104 is relatively uniform. Wherein the plurality of diffusion films 103 may be the same type of diffusion elements, for example, all diffractive optical elements; different types of diffusing elements are also possible, including, for example, diffractive optical elements and scattering optical elements.

Alternatively, the two diffusion films 103 may have the same or different degrees of light diffusion; for example, the diffusion film 103 close to the light source 101 diffuses light rays to a greater extent in the horizontal direction (for example, the horizontal direction is the long side of the liquid crystal panel 104), and the diffusion film 103 distant from the light source 101 diffuses light rays to a greater extent in the vertical direction (for example, the horizontal direction is the short side of the liquid crystal panel 104); for example, when the prism-type hollow case in fig. 13 is used as the reflective cup 102, the diffusion film 103 close to the light source 101 diffuses light rays in the horizontal direction (for example, the horizontal direction is the direction in which the prism-type hollow case extends) and the vertical direction to be almost the same, and the diffusion film 103 far from the light source 101 diffuses light rays in the horizontal direction to be larger, thereby ensuring that more light rays of the light source 101 in the horizontal direction can be diffused more uniformly.

Meanwhile, in order to ensure that the plurality of diffusion films 103 can play corresponding roles, a preset distance is arranged between the adjacent diffusion films 103 at intervals, and the preset distance can be 5-30 mm, preferably 10-20 mm. In addition, in a plurality of embodiments, the diffusion films 103 may be all disposed on the same side of the liquid crystal panel 104 close to the light source 101; the diffusion films 103 can also be dispersedly arranged on two sides of the liquid crystal screen 104, and the diffusion films 103 arranged on the light-emitting outer side of the liquid crystal screen 104 need to be tightly attached to the image generation layer 13, so that the imaging is prevented from being influenced.

Since the diffusion films 103 are spaced apart from each other by a predetermined distance, the diffusion films 103 increase the thickness of the display 10, and in a preferred embodiment, two diffusion films 103 are provided, as shown in fig. 15a and 15b, not only can the light be diffused well, but also the thickness of the display 10 is small; the number of the diffusion films 103 may be further increased on the basis of two diffusion films 103, and the number of the diffusion films 103 is not limited in the embodiment of the present application.

The embodiment of the application provides a vehicle-mounted holographic display device, through the diffusion barrier 103 that a plurality of intervals set up, plays better diffusion effect to light, and even light luminance guarantees that display 10's formation of image luminance is even, and then promotes the effect of watching of holographic image IM.

It should be noted that the vehicle-mounted holographic display device in the present application may be applied in any suitable scene, and those skilled in the art may apply the holographic display device in any suitable scene according to actual situations.

The embodiment of the application further provides a motor vehicle, which comprises the vehicle-mounted holographic display device in any one of the embodiments, the holographic image can be displayed in the motor vehicle, the holographic display device can be used for displaying rich contents such as driving assistants, driving information, entertainment information and social information, and the driving experience is greatly improved.

The above is only the preferred embodiment of the present application, and it should be noted that: it will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the application, and such modifications and enhancements are intended to be included within the scope of the application.

Claims

1. A vehicle-mounted holographic display device is arranged in the inner space of a motor vehicle and is used for displaying holographic images, and the vehicle-mounted holographic display device is characterized by comprising: a display, a transflective element and a holographic display element;

the display and the holographic display element are arranged in a first space on one side of the transflective element, the display displays an image and emits image light, the transflective element reflects the image light to the holographic display element, the holographic display element emits the image light incident to the holographic display element along the opposite direction of the incident direction, the emitted light is transmitted by the transflective element, and a holographic image is formed in a second space on one side of the transflective element, which is far away from the display.

2. The vehicular holographic display device of claim 1, further comprising: a housing case; the storage shell comprises a storage space and an opening, the display, the transflective element and the holographic display element are arranged in the storage space, and the holographic image is formed outside the opening.

3. The vehicular holographic display device of claim 2, further comprising: a fixing device; the fixing device fixedly mounts the storage housing in the motor vehicle interior space.

4. The holographic display of claim 3, in which the fixing means comprises at least one of a snap-in, an adhesive, a weld, a rivet, and a lock.

5. The on-board holographic display of claim 4, in which the fixture further comprises: at least one of an elevating mechanism, a rotating mechanism, or a translating mechanism.

6. The vehicular holographic display device of claim 1, further comprising: a controller, the display being electrically connected to the controller.

7. The vehicular holographic display device of claim 6, further comprising: the controller and the display are electrically connected with the collector.

8. The holographic display of claim 1, in which the display is perpendicular to the transflective element, and the angle between the holographic display element and the transflective element is 30-60 °.

9. The on-board holographic display of claim 1, in which the transflective element comprises: the display comprises a transparent substrate, a transflective film and an absorption film, wherein the absorption film is arranged on one side of the transflective film far away from the display;

the transflective film is used for reflecting light rays emitted by the display and transmitting light rays emitted by the holographic display element;

the absorption film is used for absorbing light rays which are not emitted by the holographic display element.

10. The vehicular holographic display device according to claim 1, in which the holographic display element includes: a retro-reflective element and a phase delay element;

the phase delay element is disposed between the retro-reflective element and the transflective element;

the retro-reflecting element is used for transmitting the light rays incident to the retro-reflecting element along the direction opposite to the incident direction;

the phase delay element is used for changing the phase of the light passing through the phase delay element.

11. The holographic display of claim 1, in which the display comprises: the liquid crystal display comprises a light source, a reflecting cup, a diffusion film and a liquid crystal screen;

light emitted by the light source is reflected by the reflecting cup and is emitted to the diffusion film, the light is diffused by the diffusion film, the diffused light is emitted to the liquid crystal screen, and the liquid crystal screen displays images and emits image light.

12. A motor vehicle, characterized in that it comprises an on-board holographic display of any of claims 1-11.