CN117233961A

CN117233961A - Display device and vehicle

Info

Publication number: CN117233961A
Application number: CN202210630314.4A
Authority: CN
Inventors: 赵晴; 毛淳; 赵晗
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-06-06
Filing date: 2022-06-06
Publication date: 2023-12-15
Also published as: WO2023236582A1; CN115657304A; CN115657304B

Abstract

The application provides a display device and a vehicle, wherein the vehicle comprises a windshield and a display device, the display device can emit images, and the windshield is used for reflecting image light emitted by the display device to human eyes. The display device comprises a shell, a protective cover, a first image source and a reflecting mirror. The shell is provided with an opening, the protective cover is arranged on the shell and seals the opening, and the protective cover and the shell enclose a space; the first image source and the reflector are both accommodated in the space, the first image source is used for emitting first image light to the protective cover, the protective cover is used for reflecting the first image light emitted by the first image source to the reflector, the reflector is used for reflecting the first image light to the protective cover, and the protective cover is also used for allowing the first image light reflected by the reflector to pass through so as to enable the first image light to be transmitted outside the space. According to the display device, the first image light is polarized and reflected by the protective cover, and the light path is folded by the protective cover, so that the size of the display device can be effectively reduced, and the display device is prevented from interfering with other components.

Description

Display device and vehicle

Technical Field

The present application relates to the field of image display technologies, and in particular, to a display device and a vehicle.

Background

Head Up Display (HUD) (or head up display system) has been widely used in automobiles. The head-up display is a display device for emitting instrument information (such as speed), navigation information and the like to the front of the visual field of a driver, the driver can see the information in front of the visual field without looking at an instrument panel or a central control display screen below the steering wheel at a low head, so that the braking response time under emergency conditions can be improved, and the driving safety is improved. However, the conventional HUD is large in size and occupies space of other components easily, so that the applicable vehicle type of the HUD is limited.

Disclosure of Invention

The application provides a display device and a vehicle, wherein the display device is small in size and can be suitable for more vehicle types.

In a first aspect, the present application provides a display device including a housing, a shield, a first image source, and a mirror. The shell is provided with an opening, the protective cover is arranged on the shell and seals the opening, and the protective cover and the shell enclose a space; the first image source and the reflector are both accommodated in the space, the first image source is used for emitting first image light to the protective cover, the protective cover is used for reflecting the first image light emitted by the first image source to the reflector, the reflector is used for reflecting the first image light to the protective cover, and the protective cover is also used for allowing the first image light reflected by the reflector to pass through so as to enable the first image light to be transmitted outside the space.

The protective cover of the display device has polarization reflection performance, and the protective cover is used for carrying out polarization reflection treatment on the first image light, so that the light path can be folded by utilizing the protective cover, and the layout of each part of the display device is compact, thereby effectively reducing the volume of the display device. Therefore, the display device can avoid interference with other parts, and the whole vehicle model which can be adapted to the display device is further expanded. In addition, when the display device is installed in a vehicle, light with a specific polarization state in sunlight which is irradiated to the protective cover through the windshield is reflected by the protective cover and cannot enter the display device to be transmitted, and imaging cannot be affected. Therefore, the protective cover with polarization reflection performance can also reduce sunlight backflow and ensure imaging quality.

In one implementation of the first aspect, the protective cover includes a cover body and a polarizing reflective element. The cover body is used for transmitting the first image light. The polarization reflection element is used for reflecting the first image light emitted by the first image source to the reflector. The reflecting mirror is used for reflecting the received first image light to the polarized reflecting element and changing the polarization state of the first image light, and the polarized reflecting element is also used for transmitting the first image light reflected by the reflecting mirror so as to transmit the first image light to the outside of the space.

In the scheme, the protective cover reflects light in a certain polarization state through the polarization reflecting element and transmits light in another polarization state, namely, the polarization reflecting function is realized. The polarization state of the image light reflected by the polarization reflecting element is different from that of the transmitted image light. In one implementation of the first aspect, the mirrors include a first mirror and a second mirror. The first reflector is used for reflecting the received first image light to the second reflector, the second reflector is used for reflecting the first image light reflected by the first reflector to the polarization reflecting element, and the first reflector or the second reflector is also used for changing the polarization state of the first image light. In the scheme, the optical path of the first image light can be increased by using the first reflecting mirror and the second reflecting mirror, and the imaging quality is improved. By enabling one of the mirrors to convert the polarization state of the light, the mirror is enabled to cooperate with a protective cover provided with polarizing reflective elements to form the desired light path.

In an implementation manner of the first aspect, the first mirror or the second mirror includes a mirror body and a first polarization conversion element, and the first polarization conversion element is disposed on a reflective side of the mirror body. The first polarization conversion element is used for transmitting the first image light and changing the polarization state of the first image light; the mirror body is used for reflecting the first image light from the first polarization conversion element. In this scheme, through the superposition of speculum body and first polarization conversion component, can realize the speculum reflection and convert the function of light polarization state, this kind of design is simple, reliable, mass production nature is good.

In one implementation of the first aspect, the second mirror comprises a curved mirror. The curved reflector can amplify the image and improve the imaging quality. When the display device is installed in a vehicle, the curved mirror can also have the effect of compensating the curvature of the windshield, thereby ensuring the imaging quality.

In one implementation manner of the first aspect, the protective cover includes a cover body, a polarization reflecting element, and a second polarization conversion element, where the cover body is used to transmit the first image light; the second polarization conversion element is used for transmitting the first image light emitted by the first image source, changing the polarization state of the first image light and enabling the first image light to be directed to the polarization reflection element; the polarization reflection element is used for reflecting the first image light from the second polarization conversion element to the second polarization conversion element; the second polarization conversion element is also used for transmitting the first image light reflected by the polarization reflection element, changing the polarization state of the first image light and enabling the first image light to be directed to the reflecting mirror; the second polarization conversion element is further used for transmitting the first image light reflected by the reflecting mirror, changing the polarization state of the first image light and enabling the first image light to be directed to the polarization reflecting element; the polarization reflecting element is also used for transmitting the first image light from the second polarization conversion element so as to transmit the first image light out of the space.

In this embodiment, the relative positions of the cover, the polarizing reflection element and the second polarization conversion element may be determined according to the above. For example in a direction from the outside to the inside of the display device. The cover, the polarization reflecting element and the second polarization converting element may be arranged in order, or the polarization reflecting element, the second polarization converting element and the cover may be arranged in order. The protective cover realizes the function of polarization reflection through the polarization reflection element, and the polarization state of the image light reflected by the polarization reflection element is different from that of the transmitted image light. The protection cover realizes the function of converting the polarization state of light through the second polarization conversion element, so that the protection cover can be matched with other components on the light path to form a required light path.

In an implementation manner of the first aspect, the first image source includes an image generating unit and a third polarization conversion element, and the third polarization conversion element is disposed on a light emitting side of the image generating unit. The image generating unit is used for emitting the first image light to the third polarization conversion element, and the third polarization conversion element is used for transmitting the first image light emitted by the image generating unit, changing the polarization state of the first image light and enabling the first image light to be directed to the protective cover. The first image source with the structure can emit image light required by design, so as to form a required light path

In one implementation of the first aspect, the second polarization conversion element is attached to the polarization reflecting element. The second polarization conversion element is closely attached to the polarization reflecting element. The scheme has the advantages of simple design, good mass production performance, lower cost and better optical performance. In one implementation of the first aspect, the second polarization conversion element comprises a 1/4 wave plate. The 1/4 wave plate has relatively low cost, excellent optical performance and good mass production.

In one implementation of the first aspect, the polarizing reflective element is attached to the cover. The attaching is that the polarized reflecting element is tightly attached to the cover body. The scheme can manufacture the protective cover with polarization reflection performance by simple design, and has good mass production performance and lower cost.

In one implementation of the first aspect, the polarizing reflective element comprises a dual brightness enhancement film. The dual-brightness enhancement film has better polarization reflection performance and thinner thickness, and can effectively reduce the occupied space

In one implementation of the first aspect, the first image source is located between the mirror and the shield. The first image source is arranged between the reflecting mirror and the protective cover, so that the installation space is not additionally occupied, and the volume of the display device can be effectively reduced.

In an implementation manner of the first aspect, the display device includes a second image source, the second image source is located in the space, the second image source is configured to emit second image light to the reflector, and the reflector is further configured to reflect the second image light emitted by the second image source to the protective cover; the protective cover is also used for transmitting the second image light reflected by the reflecting mirror so as to transmit the second image light out of the space.

In this scheme, the first image source may be a far-focus image source, and the second image source may be a near-focus image source. Through setting up two image sources, can form the virtual image respectively on far focal plane and the near focal plane to promote driving experience.

In one implementation of the first aspect, the second image source is located between the first image source and the protective cover. The second image source is arranged between the reflecting mirror and the protective cover, so that the installation space is not additionally occupied, and the volume of the display device can be effectively reduced.

In a second aspect, the application provides a vehicle comprising a windshield for reflecting image light exiting the display to a human eye and a display device. In this scheme, because the vehicle has used the display device of small volume, this display device can not crowded space of other parts for this vehicle's space layout is comparatively reasonable.

In one implementation of the second aspect, the vehicle includes a light shield disposed between the display device and the windshield, the light shield configured to shield sunlight transmitted by the windshield. In this scheme, the sunlight that the screen can effectually reduce and see through the windscreen and get into display device reduces the influence of sunlight to imaging to can also reduce the sunlight that gets into the human eye through the protection casing reflection, thereby prevent dazzling light, protection human eye.

Drawings

Fig. 1 is a schematic view of an application scenario of a display device according to an embodiment of the present application;

fig. 2 is a schematic view of an application scenario of a display device according to a first embodiment of the present application;

fig. 3 is a schematic view of an application scenario of a conventional display device;

fig. 4 is a schematic view of an application scenario of a display device according to a second embodiment of the present application;

fig. 5 is a schematic view of an application scenario of a display device according to a second embodiment of the present application;

fig. 6 is a schematic view of an application scenario of a display device according to a third embodiment of the present application;

fig. 7 is a schematic view of an application scenario of a display device according to a fourth embodiment of the present application;

fig. 8 is a schematic diagram of an application scenario of a display device according to a fifth embodiment of the present application;

fig. 9 is a schematic diagram of an application scenario of a display device according to a sixth embodiment of the present application;

Fig. 10 is a schematic view of a frame structure of a vehicle according to an embodiment of the present application.

Detailed Description

In embodiments of the present application, the use of the terms "first," "second," etc. are used to distinguish between different devices, components, or portions, and are not used to indicate or imply relative importance or number of indicated devices, components, or portions. Unless otherwise indicated, the meaning of "a plurality" is two or more.

Embodiments of the present application provide a vehicle including, but not limited to, a vehicle, a watercraft, an aircraft, and the like. The vehicle may include a display device and a windshield.

The display device is used to emit image light carrying image information including, but not limited to, state information of a vehicle, indication information of an external object, navigation information, and the like. The state information includes, but is not limited to, information such as running speed, running mileage, fuel amount, water temperature, and lamp state. The indication information of the external object includes, but is not limited to, safe distance, surrounding obstacle, reverse image and the like. The navigation information includes, but is not limited to, directional arrow, distance, travel time, and the like.

The windshield may be a protective member made of a transparent material (e.g., glass) in front of the driver seat. The windshield has a reflective property capable of reflecting image light emitted from the display device to human eyes so that the human eyes can see a virtual image presented in front of the field of view. Therefore, a driver can see information in front of the visual field without looking at an instrument panel or a central control display screen and the like at a low head, so that the braking response time under emergency conditions can be improved, and the driving safety is improved.

Fig. 1 is a schematic diagram of an application scenario of a display device according to an embodiment of the present application. As shown in fig. 1, the display device may be, for example, a Head Up Display (HUD), which may be mounted on an automobile. Illustratively, the HUD is capable of projecting navigational information and instrumentation information of the vehicle through the windshield into the driver's field of view. The plane in which the virtual image of the navigation information is located may be referred to as a far focal plane, and the plane in which the virtual image of the meter information is located may be referred to as a near focal plane. That is, the HUD shown in fig. 1 may implement a dual-focus display (hereinafter, the principle of dual-focus display will be described further), may display different information on different focus surfaces, and improves driving experience. It will be appreciated that in the vehicle, since the driver's line of sight often falls in front of the vehicle, information such as navigation information that needs to be viewed in real time can be imaged on the far focal plane, while information such as meter information that does not need to be viewed in real time can be imaged on the near focal plane.

It will be appreciated that the information displayed by the virtual images on the far and near focal planes may be configured as desired, and is not limited to that described above. For example, the information displayed on the far and near focal planes may be interchanged.

In other embodiments, the HUD may also perform a single-or multi-focal display. Wherein, single focal plane display means that information is only imaged on a single focal plane, so that human eyes can only observe one virtual image. Multi-focal-plane display means that information can be imaged on three or more focal planes, enabling the human eye to observe three or more virtual images.

The structure and operation of the display device according to the embodiment of the present application will be described in detail.

Fig. 2 shows an application scenario of the display device 4 of the first embodiment in an automobile, in which a windshield 1, an Instrument Panel (IP) 2, a visor 3, the display device 4, a pedal bracket 5, an instrument panel beam (CCB) 6, a steering column 7, and a steering wheel 8 of the automobile are shown. The light shielding plate 3 may be located between the windshield 1 and the display device 4, where the light shielding plate 3 is used to shield the sunlight transmitted through the windshield 1, prevent the sunlight from entering human eyes after being reflected by the display device 4, or prevent the sunlight from entering the display device 4 to affect imaging or cause temperature rise of the display device 4. The display device 4 may be located near the instrument panel 2, the pedal bracket 5, the instrument panel cross member 6, and the steering column 7.

As shown in fig. 2, the display device 4 may include a housing 42, a shield 41, a first image source 44, and a mirror 43.

As shown in fig. 2, the case 42 serves as a housing of the display device 4, which has an opening. The structure of the housing 42 may be designed according to need, and the present embodiment is not limited thereto.

As shown in fig. 2, the shield 41 is mounted on the housing 42 and covers the opening to enclose a space 4a with the housing 42. The structure of the protective cover 41 can be designed according to the requirement, and the embodiment is not limited. The shield 41 is used to shield the components in the space 4a, and prevents foreign matter such as dust from entering the space 4a.

In this embodiment, the protection cover 41 also has polarization reflection performance, that is, the protection cover 41 can reflect light with one polarization state and transmit light with another polarization state. The shield 41 may reflect light of at least one polarization state and may transmit light of at least one polarization state. For example, the shield 41 may reflect P polarized light and transmit S polarized light. The polarization state of the light reflected by the protective cover 41 and the polarization state of the light transmitted by the protective cover are not limited in this embodiment. The protective cover 41 may be manufactured in a suitable manner according to the product requirements, and for example, may be designed in terms of materials, structures, etc. to manufacture such protective cover 41, which is not particularly limited in this embodiment.

As shown in fig. 2, the first image source 44 is located in the space 4 a. The first image source 44 is configured to emit a first path of image light (abbreviated as first image light), where the first image light carries first image information, for example, navigation information and other information that needs to be viewed in real time, and the first image information can be imaged on a far focal plane, so that the first image source 44 can be called a far focal image source. It will be appreciated that the first image information may also be information such as meter information that need not be viewed in real time, and the first image information may be imaged on the near-focus surface, so the first image source 44 may also be referred to as a near-focus image source.

In this embodiment, the first image source 44 may include, but is not limited to, a digital micro-mirror device (DMD), a liquid crystal on silicon (liquid crystal on silicon, LCOS) display, an organic light-emitting diode (OLED) display, a liquid crystal display (liquid crystal display, LCD), a digital light processing (digital light procession, DLP) display, a micro-electro-mechanical systems (MEMS) display, and the like. In addition to the devices described above, the first image source 44 may include components that are complementary to the devices. For example, for a DMD or Lcos, the first image source 44 may also include a diffuser screen onto which light from the DMD or Lcos is projected, the diffuser screen emitting first image light.

As shown in fig. 2, the reflecting mirror 43 is provided in the space 4 a. The mirror 43 is used to reflect the first image light to the shield 41. The type and number of the reflecting mirrors 43 may be designed according to needs, and the reflecting mirrors 43 may be, for example, curved mirrors, which are not limited in this embodiment. The mirror 43 may reflect only light or may also change the polarization state of the light upon reflection.

The operation of the display device 4 will be described below.

As shown in fig. 2, the first image source 44 may emit first image light (the light path is indicated by the solid arrow) to the shield 41, and the polarization state of the first image light may be determined as needed. When the first image light is projected onto the shield 41, it is reflected by the shield 41 but does not pass through the shield 41. The first image light reflected by the shield 41 will strike the mirror 43, and the mirror 43 will reflect the first image light again to the shield 41. At this time, the first image light passes through the shield 41 and is emitted from the space 4 a. The first image light emitted from the space 4a encounters the windshield 1 and is reflected by the windshield 1 to the human eye, thereby enabling the human eye to see a virtual image.

It can be seen that the protective cover 41 participates in the processing of the first image light, and the protective cover 41 plays a role of folding the light path, so that the space between the components in the space 4a can be smaller, the layout can be more compact, and the volume of the whole display device 4 can be smaller. For example, as shown in fig. 2, the distance between the display device 4 and the pedal bracket 5, the instrument panel beam 6 and the steering column 7 is large, the display device 4 effectively avoids the positions of the pedal bracket 5, the instrument panel beam 6 and the steering column 7, and solves the problem of structural interference of various vehicle types, so that the display device 4 can be widely adapted to different vehicle types, and a large field of view (FOV) can be realized at low cost.

In addition, due to the polarization reflection performance of the shield 41, light of a specific polarization state in the sunlight irradiated to the shield 41 through the windshield 1 is reflected by the shield 41, does not enter the space 4a and is transmitted, and further does not affect imaging. Therefore, the shield 41 having polarization reflection performance can also reduce the backward flow of sunlight, ensuring the imaging quality.

For a comparative illustration of the advantages of the display device 4, fig. 3 shows a conventional application scenario of the display device 4'. As shown in fig. 3, in the conventional display device 4', the protective cover 41' is a common transparent cover body, does not have polarization reflection performance, and does not participate in the light treatment. Specifically, the image light emitted from the image source 44 'is emitted to the mirror 432', and is reflected by the mirror 432 'to the mirror 431'. After the reflection mirror 431' reflects the image light to the shield 41', the image light is emitted through the shield 41 '.

It will be appreciated that since the shield 41' is not folded over the light path, the spacing of the various components within the housing 42' is larger, and the layout of the components is looser, resulting in a larger overall display device 4 '. Therefore, the distance between the display device 4' and the pedal bracket 5, the instrument panel cross beam 6 and the steering column 7 is small, the display device 4' occupies more space, and structural interference is easy to cause, so that the display device 4' is suitable for a small number of vehicle types. In addition, the sunlight backflow problem of the display device 4' is serious, and imaging quality is affected.

As shown in fig. 4, the display device 40 of the second embodiment may include a cover 401, a second mirror 404, a first mirror 405, and a first image source 408. The display device 40 may further include a housing (not shown in fig. 4), on which the shield 401 is mounted and covers the opening of the housing, the shield 401 and the housing enclosing a space, the second mirror 404, the first mirror 405 and the first image source 408 being located in the space, the shield 401 being configured to shield components in the space.

In this embodiment, the shield 401 also has polarization reflection properties. As shown in fig. 4, the protection cover 401 may include a cover 402 and a polarizing reflection element 403, where the cover 402 may be located on the outer side, and the polarizing reflection element 403 may be located on the inner side (the inner side and the outer side refer to the inner side and the outer side of the space, and the same applies below). Illustratively, the polarizing reflective element 403 may be tightly coupled to the housing 402, e.g., the polarizing reflective element 403 may be attached to the housing 402. Alternatively, a gap may be provided between the polarizing reflection element 403 and the cover 402. The cover 402 is a structural body of the shield 401, and is capable of transmitting light. The polarization reflecting element 403 has polarization reflecting properties, i.e., the polarization reflecting properties of the shield 401 are achieved by the polarization reflecting element 403. The polarizing reflective element 403 includes, but is not limited to, a dual brightness enhancement film (dual brightness enhancement film, DBEF), which may transmit P polarized light and reflect S polarized light, or transmit S polarized light and reflect P polarized light, for example.

As shown in fig. 4, the display device 40 may include two mirrors, a second mirror 404 and a first mirror 405, and the first mirror 405 may be located between the second mirror 404 and the first image source 408. The second mirror 404 may be, for example, a curved mirror, such as a free-form curved mirror. The first mirror 405 may be a planar mirror, for example, or may be a curved mirror. The optical path can be increased by using two reflectors, and the imaging quality is improved. In addition, the curvature of the windshield 1 can be compensated by using the curved mirror, the image is enlarged, and the imaging quality is ensured.

As shown in fig. 4, schematically, the first mirror 405 may comprise a mirror body 406 and a first polarization conversion element 407. The mirror body 406 has light reflection performance. The first polarization conversion element 407 is located on the reflective side of the mirror body 406 (i.e. the side of the mirror body 406 that is used to reflect light, such as the upper side of the mirror body 406 in the view of fig. 4), and the first polarization conversion element 407 may be tightly combined with the mirror body 406, such as attached to the mirror body 406. Alternatively, the first polarization conversion element 407 may have a gap with the mirror body 406. The first polarization conversion element 407 is capable of transmitting light and converting the polarization state of the light. The first polarization conversion element 407 includes, but is not limited to, a 1/4 wave plate.

As shown in fig. 4, schematically, the first image source 408 may be located between the first mirror 405 and the shield 401. The first image source 408 may, for example, emit P polarized light.

The operation of the display device 40 will be described below.

As shown in fig. 4, the first image source 408 may emit first image light, which may be, for example, P-polarized light, to the shield 401. The first image light will be reflected by the polarization reflecting element 403 to the first polarization converting element 407, but will not transmit through the polarization reflecting element 403 (the polarization reflecting element 403 may transmit S polarized light and reflect P polarized light). The first image light will pass through the first polarization conversion element 407 and be converted into circular polarized light by the first polarization conversion element 407. The circularly polarized light is reflected by the mirror body 406, passes through the first polarization conversion element 407 again, is converted into S polarized light by the first polarization conversion element 407, and is directed to the second mirror 404. The second reflecting mirror 404 reflects the S-polarized light to the polarizing reflecting element 403, and the S-polarized light can transmit the polarizing reflecting element 403 and the cover 402 and strike the windshield 1. The windshield 1 reflects this S polarized light into the human eye, thereby making the human eye see a virtual image.

Therefore, the shield 401 participates in the processing process of the first image light, and the shield 401 plays a role of folding the light path, so that the space between the components of the display device 40 can be smaller, the layout can be more compact, and the volume of the whole display device 40 can be smaller. In comparison with the illustration of fig. 4 and 3, particularly, after the first image source 408 is disposed between the protective cover 401 and the second reflecting mirror 404, the housing of the display device 40 can be moved upwards, so that the positions of the pedal bracket 5, the dashboard cross beam 6 and the steering column 7 can be effectively avoided, and the interference problem is avoided. Therefore, the display device 40 has a small size and can be widely adapted to different vehicle types. In addition, since the shield 401 has the polarization reflecting element 403, the backward flow of sunlight can be reduced, and the imaging quality can be ensured.

Based on the light path principle of the display device 40 described above, the following alternative structure of the display device 40 can be obtained, which also has the advantage of the display device 40.

For example, since the cover 402 is only a light-transmitting medium and does not change the polarization state of light, the cover 402 and the polarization reflecting element 403 can exchange positions, and the polarization reflecting function of the cover 401 can be achieved as well.

Alternatively, as shown in fig. 5, for example, the first mirror 504 of the display device 50 may be made to reflect light only without changing the polarization state of the light, while the second mirror 501 may be made to reflect light and be able to change the polarization state of the light. Specifically, the second mirror 501 may include a mirror body 502 and a first polarization conversion element 503. The mirror body 502 can be a curved mirror, such as a free-form mirror. The first polarization conversion element 503 is disposed on the reflective side of the reflector body 502, and the first polarization conversion element 503 is capable of transmitting light and converting the polarization state of the light, and the first polarization conversion element 503 includes, but is not limited to, a 1/4 wave plate. Therefore, when the first image light (for example, P polarized light) is incident on the first mirror 504, the first image light is reflected by the first mirror 504 to the second mirror 501. The second mirror 501 is capable of reflecting the first image light to the polarization reflecting element 403 and changing the polarization state of the first image light (e.g., converting to S-polarized light).

Alternatively, a single mirror capable of reflecting the first image light to the polarization reflecting element 403 and changing the polarization state of the first image light may be used instead of the first mirror and the second mirror described above.

The design of the protective cover and the design of the reflecting mirror can be combined as required.

Fig. 6 illustrates an application scenario of the display device 60 of the third embodiment.

In comparison with fig. 6 and fig. 5, the display device 60 may further include a second image source 601 on the basis of the display device 50 shown in fig. 5, and the second image source 601 may be located between the first image source 408 and the cover 401, for example. The second image source 601 is also located in the space enclosed by the shield 401 and the housing. The second image source 601 is configured to emit a second path of image light (abbreviated as second imaging light), where the second image light carries second image information, and the second image information may be, for example, information that needs not to be checked in real time, such as instrument information, and the second image information may be imaged on a near focal plane, so the second image source 601 may be referred to as a near focal image source. It will be appreciated that the second image information may be information such as navigation information, etc. that needs to be viewed in real time, and the second image information may be imaged on the far focal plane, so the second image source 601 may be also referred to as a far focal image source.

The second image source 601 includes, but is not limited to, a DMD, LCOS display, OLED display, LCD, DLP display, MEMS display, and the like. In addition to the devices described above, the second image source 601 may include components that mate with the devices. For example, for DMD or LcoS, the second image source 601 may further include a diffusion screen onto which light of the DMD or LcoS is projected, the diffusion screen emitting second image light.

The operation principle of the display device 60 is described below, wherein the optical path of the first image light (indicated by the solid open arrow line in fig. 6) emitted from the first image source 408 (the first image light forms the first virtual image) is as described above, and is not repeated here, and the optical path of the second image light (indicated by the solid closed arrow line in fig. 6) emitted from the second image source 601 is described below with emphasis.

As shown in fig. 6, the second image source 601 emits second image light, which may be, for example, the same as the polarization state of the first image light, for example, P-polarized light. The second image light is directly projected to the second mirror 501. At this time, the second image light will pass through the first polarization conversion element 503 and be converted into circularly polarized light. The circularly polarized light is reflected by the mirror body 502 and transmitted through the first polarization conversion element 503 again, and is converted into S polarized light. The S-polarized light is transmitted through the shield 401 and then is incident on the windshield 1 and reflected by the windshield 1 to the human eye, thereby making the human eye see the second virtual image.

In this embodiment, the second virtual image may be located on the near focal plane, and the first virtual image may be located on the far focal plane. Thus, the display device 60 can realize double-focus display, and driving experience is improved.

As described above, the display device 60 has a small volume, can be widely adapted to different vehicle types, and can realize a large angle of view at a low cost. And, the display device 60 can reduce the backward flow of sunlight, and ensure the imaging quality.

Fig. 7 illustrates an application scenario of the display device 70 of the fourth embodiment.

In comparison with fig. 7 and fig. 4, the display device 70 may further include a second image source 701 on the basis of the display device 40 shown in fig. 4, and the second image source 701 may be located between the first image source 408 and the cover 401, for example. The second image source 701 is also located in the space enclosed by the shield 401 and the housing. The second image source 701 is configured to emit second image light, where the second image light carries second image information, and the second image information may be information that needs not to be viewed in real time, such as instrument information, and the second image information may be imaged on a near focal plane, so the second image source 701 may be referred to as a near focal image source. It can be appreciated that the second image information may be information such as navigation information, etc. that needs to be viewed in real time, and the second image information may be imaged on the far focal plane, so the second image source 701 may also be referred to as a far focal image source.

As shown in fig. 7, the second image source 701 may include a second image generating unit 702 and a fourth polarization conversion element 703. The second image generating unit 702 is configured to emit second image light, where the second image generating unit 702 includes, but is not limited to, a DMD, an LCOS display, an OLED display, an LCD, a DLP display, a MEMS display, and the like. The fourth polarization conversion element 703 is located on the light-emitting side of the second image generation unit 702, and the fourth polarization conversion element 703 is capable of transmitting light and changing the polarization state of the light. The fourth polarization conversion element 703 may be, for example, a 1/2 wave plate.

The operation principle of the display device 70 is described below, wherein the optical path of the first image light (indicated by the solid open arrow line in fig. 7) emitted from the first image source 408 (the first image light forms the first virtual image) is as described above, and is not repeated here, and the optical path of the second image light (indicated by the solid closed arrow line in fig. 7) emitted from the second image source 701 is described below with emphasis.

As shown in fig. 7, the second image generating unit 702 emits second image light, which may be, for example, the same as the polarization state of the first image light, for example, P-polarized light. The second image light is transmitted through the fourth polarization conversion element 703 and is converted into S-polarized light. The S-polarized light is directly projected to the second mirror 404 and reflected by the second mirror 404 to the shield 401. The S-polarized light is transmitted through the shield 401 and then is incident on the windshield 1 and reflected by the windshield 1 to the human eye, thereby making the human eye see the second virtual image.

The display device 70 of the embodiment can realize double-focus display, and improves driving experience. The display device 70 has a small volume, can be widely adapted to different vehicle types, and can realize a large angle of view at a low cost. And, the display device 70 can reduce the backward flow of sunlight, and ensure the imaging quality.

Fig. 8 illustrates an application scenario of the display device 80 of the fifth embodiment.

As shown in fig. 8, the display device 80 may include a protective cover 801, a second mirror 805, a first mirror 806, and a first image source 807. The display device 80 may further include a housing (not shown in fig. 8) on which the protective cover 801 is mounted and covers the opening of the housing, the protective cover 801 and the housing enclosing a space, the second mirror 805, the first mirror 806 and the first image source 807 being located in the space, the protective cover 801 being for protecting components in the space.

As shown in fig. 8, the shield 801 of the fifth embodiment may include a shield body 802, a polarization reflecting element 803, and a second polarization converting element 804, unlike the shield of the above embodiments. Illustratively, the polarization reflecting element 803 may be located between the housing 802 and the second polarization converting element 804. The polarizing reflective element 803 may be tightly coupled to the housing 802, for example, the polarizing reflective element 803 may be attached to the housing 802. Alternatively, the polarizing reflective element 803 may have a gap with the cover 802. The second polarization conversion element 804 may be closely coupled with the polarization reflecting element 803, for example, the second polarization conversion element 804 may be attached to the polarization reflecting element 803. Alternatively, the second polarization conversion element 804 and the polarization reflection element 803 may have a gap.

The polarization reflecting element 803 has polarization reflecting properties including, but not limited to, DBEF, which may transmit P-polarized light and reflect S-polarized light, or transmit S-polarized light and reflect P-polarized light, for example. The second polarization conversion element 804 is capable of transmitting light and changing the polarization state of the light, which may be a 1/4 wave plate, for example. The shield 801 has both a polarization reflection function and a polarization state conversion function due to the polarization reflection element 803 and the second polarization conversion element 804.

As shown in fig. 8, the second mirror 805 may be, for example, a curved mirror, specifically, a free-form curved mirror. The first mirror 806 may be located between the second mirror 805 and the first image source 807, and the first mirror 806 may be a planar mirror, for example, or may also be a curved mirror. Both the second mirror 805 and the first mirror 806 may reflect only light, but not change the polarization state of the light. The optical path can be increased by using two reflectors, and the imaging quality is improved. In addition, the curvature of the windshield 1 can be compensated by using the curved mirror, and the imaging quality can be ensured.

As shown in fig. 8, schematically, a first image source 807 may be located between the first mirror 806 and the shield 801. The first image source 807 may include a first image generation unit 808 and a third polarization conversion element 809. The first image generation unit 808 is configured to emit first image light, where the first image generation unit 808 includes, but is not limited to, a DMD, LCOS display, OLED display, LCD, DLP display, MEMS display, and the like. The third polarization conversion element 809 is located on the light-emitting side of the first image generating unit 808, and the third polarization conversion element 809 is capable of transmitting light and changing the polarization state of the light. The third polarization conversion element 809 may be, for example, a 1/4 wave plate.

The operation of the display device 80 will be described below.

As shown in fig. 8, the first image generation unit 808 emits first image light, which may be S-polarized light, for example. The first image light is transmitted through the third polarization conversion element 809 and then converted into circularly polarized light. The circularly polarized light is transmitted through the second polarization conversion element 804 and is converted into P-polarized light. The P-polarized light is reflected back after it reaches the polarization reflecting element 803, is transmitted through the second polarization converting element 804 again, and is converted into circularly polarized light by the second polarization converting element. The circularly polarized light is reflected by the first mirror 806 to the second mirror 805, and is reflected by the second mirror 805 to the second polarization conversion element 804. The circularly polarized light is transmitted through the second polarization conversion element 804 and is converted into S polarized light. The S polarized light sequentially passes through the polarizing reflection element 803 and the cover 802, and then is emitted to the windshield 1, and is reflected by the windshield 1 to the human eye, so that the human eye can see a virtual image.

The display device 80 of the present embodiment has a smaller volume, can be widely adapted to different vehicle types, and can realize a large field angle at a lower cost. And, the display device 80 can reduce the sunlight flowing backward, and ensure the imaging quality.

Based on the light path principle of the display device 80 described above, an alternative structure of the display device 80 can be obtained, which also has the advantage of the display device 80.

For example, since the cover 802 is only a light-transmitting medium and does not change the polarization state of light, the cover 802, the second polarization conversion element 804, and the polarization reflection element 803 may be sequentially arranged in a direction from the inside to the outside of the display device 80, that is, the cover 802 is located at the inside, the polarization reflection element 803 is located at the outside, and the second polarization conversion element 804 is located at the middle. The protective cover also has a polarization reflection function and a polarization state conversion function.

For example, both the first mirror and the second mirror may change the polarization state of light. Alternatively, a single mirror may be used in place of the first mirror 806 and the second mirror 805.

Fig. 9 illustrates an application scenario of the display device 90 of the sixth embodiment.

As shown in fig. 8 and 9, the display device 90 may further include a second image source 901 on the basis of the display device 80 shown in fig. 8, and the second image source 901 may be located between the first image source 807 and the protective cover 801, for example. The second image source 901 is also located in the space enclosed by the protective cover 801 and the housing. The second image source 901 is configured to emit second image light, where the second image light carries second image information, for example, information that may be displayed in real time, such as meter information, and the second image information may be imaged on a near focal plane, so the second image source 901 may be referred to as a near focal image source. It can be understood that the second image information may be information such as navigation information, etc. that needs to be viewed in real time, and the second image information may be imaged on a far focal plane, so the second image source 901 may also be referred to as a far focal image source.

As shown in fig. 9, the second image source 901 may include a second image generation unit 902 and a fourth polarization conversion element 903. The second image generating unit 902 is configured to emit second image light, where the second image generating unit 902 includes, but is not limited to, a DMD, an LCOS display, an OLED display, an LCD, a DLP display, a MEMS display, and the like. The fourth polarization conversion element 903 is located on the light exit side of the second image generation unit 902, and the fourth polarization conversion element 903 is capable of transmitting light and changing the polarization state of the light. The fourth polarization conversion element 903 may be, for example, a 1/4 wave plate.

The operation principle of the display device 90 is described below, wherein the optical path of the first image light (indicated by the open arrow solid line in fig. 9, and the first image light forms the first virtual image) emitted from the first image source 807 is the same as that described above, and is not repeated here, and the optical path of the second image light (indicated by the closed arrow solid line in fig. 9) emitted from the second image source 901 is described below with emphasis.

As shown in fig. 9, the second image generating unit 902 emits second image light, which may be different from the polarization state of the first image light, for example, P-polarized light. The second image light is transmitted through the fourth polarization conversion element 903 and then converted into circularly polarized light. The circularly polarized light is directly projected to the second mirror 805 and reflected by the second mirror 805 to the second polarization conversion element 804. The circularly polarized light is transmitted through the second polarization conversion element 804 and is converted into S polarized light. The S-polarized light sequentially passes through the polarizing reflection element 803 and the cover 802, and then is emitted to the windshield 1, and is reflected by the windshield 1 to the human eye, so that the human eye sees the second virtual image.

The display device 90 of the embodiment can realize double-focus display, and improves driving experience. The display device 90 has a small volume, can be widely adapted to different vehicle types, and can realize a large field angle at a low cost. And, the display device 90 can reduce the sunlight backflow and ensure the imaging quality.

Fig. 10 is a schematic diagram of a frame structure of a vehicle according to an embodiment of the present application. It should be noted that fig. 10 is only a schematic view of one possible functional framework of the vehicle. In practice, the vehicle may include more or fewer systems or elements, and embodiments of the application are not limited. The vehicle may be a car, truck, motorcycle, bus, boat, airplane, helicopter, mower, recreational vehicle, recreation ground vehicle, construction equipment, electric car, golf car, train, trolley, etc., and the embodiment of the application is not particularly limited.

As shown in fig. 10, the vehicle may include various subsystems, such as a sensor system 12, a control system 14, one or more peripheral devices 16 (one schematically depicted in fig. 10), a power source 18, a computer system 20, and a display system 22. Alternatively, the vehicle may include other functional systems, such as an engine system to power the vehicle, etc., as the application is not limited herein.

As shown in fig. 10, the sensor system 12 may include a number of detection devices that are capable of detecting measured information and converting the detected information into electrical signals or other forms of information. Illustratively, these detection devices may include a global positioning system 1201 (global positioning system, GPS), a vehicle speed sensor 1202, an inertial measurement unit 1203 (inertial measurement unit, IMU), a radar unit 1204, a laser range finder 1205, an imaging unit 1206, a wheel speed sensor 1207, a steering sensor 1208, a gear sensor 1209, or other elements for automatic detection, and the like, and embodiments of the present application are not limited.

The global positioning system 1201 is a system for performing positioning and navigation in real time on a global scale by using GPS positioning satellites. In the embodiment of the application, the global positioning system 1201 can be used for realizing real-time positioning of the vehicle and providing geographic position information of the vehicle.

The vehicle speed sensor 1202 detects a running speed of the vehicle.

The inertial measurement unit 1203 may include a combination of accelerometers and gyroscopes for measuring angular rate and acceleration of the vehicle. For example, during running of the vehicle, the inertia measurement unit 1203 may measure a position and an angle change of the vehicle body based on inertial acceleration of the vehicle, and the like.

Radar unit 1204 may also be referred to as a radar system. Radar unit 1204 may sense objects with wireless signals in the current environment in which the vehicle is located. Optionally, radar unit 1204 may also sense information such as the speed of travel and direction of travel of the object. In practice, radar unit 1204 may be configured as one or more antennas for receiving or transmitting wireless signals.

The laser rangefinder 1205 may utilize a modulated laser to effect distance measurement of the target object. In practical applications, laser rangefinder 1205 may include, but is not limited to, a combination of any one or more of a laser source, a laser scanner, and a laser detector.

The image capturing unit 1206 is used to capture images, such as images and videos. During the driving of the vehicle or after the camera unit 1206 is activated, the camera unit 1206 may acquire images of the environment in which the vehicle is located in real time. For example, the camera unit 1206 may acquire respective images in real-time, continuously during the vehicle entering and exiting the tunnel. In practice, the image capturing unit 1206 includes, but is not limited to, a vehicle recorder, a video camera, a camera or other elements for photographing/photography, etc. The number of the image capturing units 1206 is not limited in the embodiment of the present application.

The wheel speed sensor 1207 is a sensor for detecting the rotational speed of the vehicle wheel. The wheel speed sensor 1207 may include, but is not limited to, a magneto-electric wheel speed sensor and a hall wheel speed sensor.

The steering sensor 1208 may also be referred to as a steering angle sensor, and may be used to detect a steering angle of the vehicle. In practice, the steering sensor 1208 may be used to measure the steering angle of the vehicle steering wheel, or to measure an electrical signal indicative of the steering angle of the vehicle steering wheel. Alternatively, the steering sensor 1208 may be used to measure the steering angle of the vehicle tire, or to measure an electrical signal representing the steering angle of the vehicle tire, or the like, and the embodiment of the present application is not limited. That is, the steering sensor 1208 may be used to measure any one or a combination of the following: steering angle of the steering wheel, electric signals indicating steering angle of the steering wheel, steering angle of wheels (vehicle tires), electric signals indicating steering angle of wheels, and the like.

The shift position sensor 1209 is used to detect the current shift position of the vehicle running. The gear in the vehicle may also be different due to the different factory suppliers of the vehicle. Taking an autopilot vehicle as an example, the autopilot vehicle supports 6 gears, respectively: p, R, N, D, 2, and L. Among them, P (park) gear is used for parking, which locks a braking portion of a vehicle by a mechanical device of the vehicle so that the vehicle cannot move. R (reverse) gear, also known as reverse gear, is used for reversing the vehicle. D (drive) gear, also known as forward gear, is used for the vehicle to travel on the road. The 2 (second) gear is also a forward gear for adjusting the running speed of the vehicle. Gear 2 is typically available for use on both uphill and downhill slopes of the vehicle. An L (low) range, also known as a low range, is used to define the travel speed of the vehicle. For example, on a downhill road, the vehicle enters L gear, so that the vehicle is braked by using engine power when going downhill, and a driver does not need to step on the brake for a long time to cause overheat of a brake pad and danger occurs.

The control system 14 may include several elements, such as a steering unit 1401, a braking unit 1402, a lighting system 1403, an autopilot system 1404, a map navigation system 1405, a network timing system 1406, and an obstacle avoidance system 1407 shown in fig. 10. Illustratively, the control system 14 may also include elements such as a throttle controller and an engine controller for controlling the speed of travel of the vehicle, and embodiments of the present application are not limited.

The steering unit 1401 may represent a system for adjusting the direction of travel of a vehicle, which may include, but is not limited to, a steering wheel, or any other device for adjusting or controlling the direction of travel of a vehicle.

The brake unit 1402 may be used to slow the travel speed of the vehicle, which may also be referred to as a vehicle brake system. Including but not limited to a brake controller, a retarder or any other device for decelerating a vehicle, etc. In practice, the brake unit 1402 may utilize friction to slow the vehicle tires and thus the vehicle's travel speed.

The lighting system 1403 is used to provide lighting or warning functions for the vehicle. For example, during night driving of the vehicle, lighting system 1403 may activate the front and rear lights of the vehicle to provide illumination for vehicle driving, ensuring safe driving of the vehicle. In practice, lighting system 1403 includes, but is not limited to, front lights, rear lights, width lights, warning lights, and the like.

Autopilot system 1404 may include hardware and software systems for processing and analyzing data entered into autopilot system 1404 to obtain actual control parameters of various components of control system 14, such as desired brake pressure of a brake controller in brake unit 1402 and desired torque of the engine, etc., to facilitate corresponding control of control system 14 to ensure safe driving of the vehicle. Illustratively, the autopilot system 1404 may determine information such as obstacles faced by the vehicle, characteristics of the environment in which the vehicle is located (e.g., lanes in which the vehicle is currently traveling, road boundaries, and upcoming traffic lights) and the like by analyzing the data. The data input to the autopilot system 1404 may be image data collected by the camera unit 1206, or data collected by other components of the sensor system 12, such as steering wheel angle provided by the steering sensor 1208, wheel speed provided by the wheel speed sensor 1207, etc., which are not limited in this embodiment of the application.

The map navigation system 1405 is used to provide map information and navigation services for a vehicle. In practical applications, the map navigation system 1405 may plan an optimal driving route, for example, a route with the shortest route or a route with a smaller traffic flow, according to the positioning information (specifically, the current position of the vehicle) of the vehicle provided by the GPS and the destination address input by the user, so as to facilitate the vehicle to navigate according to the optimal driving route. Alternatively, the map navigation system 1405 may provide or display corresponding map information to the user according to the actual requirement of the user, for example, displaying the road section on which the vehicle is currently running on the map in real time, etc., which is not limited by the embodiment of the present application.

The network time synchronization system 1406 (network time system, NTS) is used to provide time synchronization services to ensure that the current time of the vehicle's system is synchronized with the network standard time, which is advantageous for providing more accurate time information to the vehicle. In a specific implementation, the network time synchronization system 1406 may obtain a standard time signal from a GPS satellite, and use the time signal to synchronously update the current time of the system of the vehicle, so as to ensure that the current time of the system of the vehicle is consistent with the time of the obtained standard time signal.

The obstacle avoidance system 1407 is used to predict obstacles that may be encountered during travel of the vehicle and to control the vehicle to bypass or cross the obstacles to achieve normal travel of the vehicle. For example, the obstacle avoidance system 1407 may utilize data collected by elements of the sensor system 12 to analyze to determine possible obstacles on the road on which the vehicle is traveling. If the obstacle is large in size, such as a stationary building (building) at the roadside, the obstacle avoidance system 1407 may control the vehicle to bypass the obstacle for safe travel. Conversely, if the obstacle is small in size, such as small Dan Toudeng on the road, the obstacle avoidance system 1407 may control the vehicle to continue traveling forward past the obstacle, and so on.

Peripheral device 16 may include several elements such as communications system 1601, touch screen 1602, user interface 1603, microphone 1604, speaker 1605, and the like in fig. 10.

The communication system 1601 is used to enable network communication between the vehicle and other devices. In practice, the communication system 1601 may employ wireless communication technology or wired communication technology to enable network communication between the vehicle and other devices. The wired communication technology may refer to communication between the vehicle and other devices through a network cable or an optical fiber, etc. The wireless communication technologies include, but are not limited to, global system for mobile communications (global system for mobile communications, GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), wireless local area networks (wireless local area networks, WLAN) (e.g., wireless fidelity (wireless fidelity, wi-Fi) networks), bluetooth (blue, BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field wireless communication technologies (near field communication, NFC), and infrared technologies (IR), etc.

The touch screen 1602 may be used to detect a user's touch operation instructions. For example, the user performs a touch operation on the content data displayed on the touch screen 1602 according to an actual requirement, so as to implement a function corresponding to the touch operation, for example, playing a multimedia file such as music, video, etc. The user interface 1603 may be a touch panel.

The user interface 1603 may be a physical key or a mouse. The user interface 1603 may also be a display screen for outputting data, displaying images or data. The user interface 1603 may also illustratively be at least one device belonging to the category of peripheral devices, such as touch screens, microphones, speakers, etc.

A microphone 1604, also known as a microphone, is used to convert sound signals into electrical signals. When making a call or sending a voice message, the user sounds near the microphone, and a sound signal may be input into the microphone.

Speaker 1605, also referred to as a horn, converts audio electrical signals into sound signals. The vehicle can listen to music, or listen to hands-free calls, etc. through the speaker 1605.

The power source 18 is used to provide power or energy to the vehicle, including but not limited to a rechargeable lithium battery or lead acid battery, or the like. In practice, one or more battery packs in the power supply 18 are used to provide electrical energy or power for vehicle launch. The type and material of the power source 18 are not limiting in the present embodiment.

Several functions of the vehicle may be controlled by the computer system 20. The computer system 20 may include one or more processors 2001 (one processor is shown in fig. 10 as an example) and memory 2002 (which may also be referred to as a storage device). In practical applications, the memory 2002 may be internal to the computer system 20 or external to the computer system 20, for example, as a cache in a vehicle, and the embodiments of the present application are not limited.

The processor 2001 may include one or more general-purpose processors, such as a graphics processor (graphic processing unit, GPU). The processor 2001 may be used to execute related programs or instructions corresponding to the programs stored in the memory 2002 to implement the corresponding functions of the vehicle.

Memory 2002 may include volatile memory (RAM), such as RAM; the memory may also include a non-volatile memory (non-volatile memory), such as ROM, flash memory (flash memory), HDD, or solid state disk SSD; memory 2002 may also include combinations of the above types of memory. Memory 2002 may be used to store a set of program codes or instructions corresponding to the program codes so that processor 2001 invokes the program codes or instructions stored in memory 2002 to implement the corresponding functions of the vehicle. Including but not limited to some or all of the functions in the vehicle function frame schematic shown in fig. 10. In an embodiment of the present application, the memory 2002 may store a set of program codes for controlling the vehicle, and the processor 2001 may call the program codes to control the safe driving of the vehicle.

Illustratively, the memory 2002 may store information such as road maps, driving routes, sensor data, and the like, in addition to program code or instructions. The computer system 20 may implement the relevant functions of the vehicle in combination with other elements in fig. 10, such as sensors in the sensor system 12, GPS, etc. For example, the computer system 20 may control the traveling direction or traveling speed of the vehicle based on the data input from the sensor system 12, and the present application is not limited.

The display system 22 can include several elements, such as a windshield 2201, controller 2202, and display device 2203 as shown in fig. 10. The controller 2202 is configured to generate an image according to a user instruction and transmit the image to the display device 2203. The display device 2203 may be any one or more of the display devices of the above embodiments, such as the display device 4, the display device 40, the display device 70, and the like.

The windshield 2201 is used in conjunction with the display device 2203 to achieve the light path of the display system 22 such that a virtual image is presented in front of the driver.

It should be noted that the functions of some of the elements in the display system 22 may be implemented by other subsystems of the vehicle, for example, the controller 2202 may also be an element in the control system 14.

Fig. 10 illustrates four subsystems of the vehicle including the sensor system 12, the control system 14, the computer system 20, and the display system 22, and is not intended to be limiting of embodiments of the present application. In practical applications, the vehicle may combine several elements in the vehicle according to different functions, thereby obtaining subsystems with corresponding different functions.

For example, the vehicle may also include an electronic stability system (electronic stability program, ESP), an electric power steering system (electric power steering, EPS), and the like. The ESP system may consist of part of the sensors in the sensor system 12 and part of the elements in the control system 14, which ESP system may comprise, for example, wheel speed sensors 1207, steering sensors 1208, lateral acceleration sensors and control units involved in the control system 14, etc. The EPS system may be comprised of some of the sensors in the sensor system 12, some of the elements in the control system 14, and the power source 18, such as steering sensors 1208, generators and reducers involved in the control system 14, battery power sources, etc. may be included in the EPS system.

As another example, display system 22 may also include a user interface 1603 and a touch screen 1602 or the like in peripheral device 16 to implement the functionality of receiving user instructions.

The foregoing is illustrative of the present application, and it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the true scope of the application.

Claims

1. A display device is characterized in that,

comprises a shell, a protective cover, a first image source and a reflecting mirror;

the shell is provided with an opening, the protective cover is arranged on the shell and seals the opening, and a space is formed by the protective cover and the shell; the first image source and the reflecting mirror are both accommodated in the space;

the first image source is used for emitting first image light to the protective cover, the protective cover is used for reflecting the first image light emitted by the first image source to the reflecting mirror, the reflecting mirror is used for reflecting the first image light to the protective cover, and the protective cover is also used for transmitting the first image light reflected by the reflecting mirror so as to enable the first image light to be transmitted outside the space.

2. The display device of claim 1, wherein the display device comprises a display device,

the protective cover comprises a cover body and a polarized reflecting element;

the cover body is used for allowing the first image light to pass through;

The polarization reflecting element is used for reflecting the first image light emitted by the first image source to the reflecting mirror;

the reflecting mirror is used for reflecting the received first image light to the polarized reflecting element and changing the polarization state of the first image light;

the polarizing reflection element is further used for transmitting the first image light reflected by the reflecting mirror so as to transmit the first image light out of the space.

3. The display device of claim 2, wherein the display device comprises a display device,

the reflector comprises a first reflector and a second reflector;

the first mirror is used for reflecting the received first image light to the second mirror, and the second mirror is used for reflecting the first image light reflected by the first mirror to the polarization reflecting element, wherein the first mirror or the second mirror is also used for changing the polarization state of the first image light.

4. A display device according to claim 3, wherein,

the first reflecting mirror or the second reflecting mirror comprises a reflecting mirror body and a first polarization conversion element, and the first polarization conversion element is arranged on the reflecting side of the reflecting mirror body;

The first polarization conversion element is used for transmitting the first image light and changing the polarization state of the first image light; the mirror body is configured to reflect the first image light from the first polarization conversion element.

5. The display device according to claim 3 or 4, wherein,

the second mirror comprises a curved mirror.

6. The display device of claim 1, wherein the display device comprises a display device,

the protective cover comprises a cover body, a polarization reflecting element and a second polarization conversion element, wherein the cover body is used for allowing the first image light to pass through;

the second polarization conversion element is used for transmitting the first image light emitted by the first image source, changing the polarization state of the first image light and enabling the first image light to be emitted to the polarization reflection element; the polarization reflecting element is configured to reflect the first image light from the second polarization conversion element to the second polarization conversion element; the second polarization conversion element is further used for transmitting the first image light reflected by the polarization reflection element, changing the polarization state of the first image light and enabling the first image light to be directed to the reflecting mirror;

The second polarization conversion element is further used for transmitting the first image light reflected by the reflecting mirror, changing the polarization state of the first image light and enabling the first image light to be directed to the polarization reflecting element; the polarization reflecting element is further configured to transmit the first image light from the second polarization conversion element so as to transmit the first image light out of the space.

7. The display device according to any one of claims 1 to 6, wherein,

the first image source comprises an image generation unit and a third polarization conversion element, and the third polarization conversion element is arranged on the light emitting side of the image generation unit;

the image generation unit is used for emitting the first image light to the third polarization conversion element; the third polarization conversion element is used for transmitting the first image light emitted by the image generation unit, changing the polarization state of the first image light and enabling the first image light to be emitted to the protective cover.

8. The display device of claim 6, wherein the display device comprises a display device,

the second polarization conversion element is attached to the polarization reflection element.

9. The display device according to claim 6 or 8, wherein,

The second polarization conversion element includes a 1/4 wave plate.

10. The display device according to any one of claims 2-6, 8, 9, wherein,

the polarization reflecting element is attached to the cover body.

11. The display device according to any one of claims 2-6, 8, 9, 10, wherein,

the polarizing reflective element includes a dual brightness enhancement film.

12. The display device according to any one of claims 1 to 11, wherein,

the first image source is located between the reflector and the protective cover.

13. The display device according to any one of claims 1 to 12, wherein,

the display device comprises a second image source, wherein the second image source is positioned in the space and is used for emitting second image light to the reflecting mirror;

the reflector is also used for reflecting the second image light emitted by the second image source to the protective cover; the protective cover is also used for transmitting the second image light reflected by the reflecting mirror so as to transmit the second image light out of the space.

14. The display device of claim 13, wherein the display device comprises a display device,

the second image source is positioned between the first image source and the protective cover.

15. A vehicle, characterized in that,

a display device comprising a windshield for reflecting image light exiting the display device to the human eye and any one of claims 1-14.

16. The vehicle of claim 15, wherein the vehicle is a vehicle having a plurality of vehicles,

the vehicle comprises a light shielding plate, wherein the light shielding plate is arranged between the display device and the windshield, and the light shielding plate is used for shielding sunlight transmitted by the windshield.