CN210666208U

CN210666208U - Head-up display device

Info

Publication number: CN210666208U
Application number: CN201921444206.8U
Authority: CN
Inventors: 方涛; 吴慧军; 徐俊峰
Original assignee: Future Beijing Black Technology Co Ltd
Current assignee: Future Beijing Black Technology Co Ltd
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-06-02
Anticipated expiration: 2029-09-02

Abstract

The utility model provides a new line display device, include: a light transmitting element and a head-up display body having an image source; the light transmission element is arranged on a light path between the image source and the external reflection device, and is used for transmitting the light with the first characteristic and reflecting or absorbing the light with the second characteristic; the second characteristic is a different characteristic from the first characteristic; the image source is used for emitting imaging light with the first characteristic, and the imaging light penetrates through the light transmission element and then enters the reflecting device. By the head-up display device provided by the embodiment of the utility model, the head-up display device can normally image by utilizing the characteristic that the light transmission element can transmit the imaging light with the first characteristic; meanwhile, a part of external light can be filtered, namely the light with the second characteristic can be absorbed or reflected, so that the illumination intensity of the external light entering the image source can be reduced, and the image source can be prevented from being burnt out due to the fact that the external light is too strong.

Description

Head-up display device

Technical Field

The utility model relates to a new line display technical field particularly, relates to a new line display equipment.

Background

HUD (head up display, the new line display) utilizes car windshield can image (virtual image), make the new line display can throw out the image that contains the panel board information, the driver is when watching the outside real environment of windshield, can also watch the formation of image of new line display, thereby can avoid the driver to hang down the distraction that the panel board leads to at the driving in-process, can improve and drive factor of safety, also can bring better driving experience simultaneously.

The traditional HUD is internally provided with an image source, and when strong external light enters the image source, the temperature of the image source is increased, and the normal work of the image source can be influenced. In addition, the HUD is typically also provided with a curved mirror, and the image source is close to the focal plane of the curved mirror, and the HUD can normally operate. However, when strong light (such as sunlight) exists outside the vehicle, the external light can pass through the windshield to reach the curved mirror and then be converged on the focal plane of the curved mirror, so that the converged light spot may burn out an image source, and even cause an accident due to vehicle fire. Referring to fig. 1, when the sun is at an angle or position, sunlight may be transmitted through the windshield and directly incident on the curved mirror 1 of the HUD, causing light to converge near the image source 2, potentially burning the image source 2.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, an object of the embodiments of the present invention is to provide a head-up display device.

An embodiment of the utility model provides a new line display device, include: a light transmitting element and a head-up display body having an image source;

the light ray transmission element is arranged on a light path between the image source and the external reflection device, and is used for transmitting the light ray with the first characteristic and reflecting or absorbing the light ray with the second characteristic; the second characteristic is a different characteristic than the first characteristic;

the image source is used for emitting imaging light rays with first characteristics, and the imaging light rays penetrate through the light ray transmission element and then are incident to the reflecting device.

In the above-mentioned scheme provided by the embodiment of the present invention, the light transmission element is disposed in the head-up display body, and the head-up display device can normally image by using the characteristic that the light transmission element can transmit the imaging light with the first characteristic; meanwhile, a part of external light can be filtered, namely the light with the second characteristic can be absorbed or reflected, so that the illumination intensity of the external light entering the image source can be reduced, and the image source can be prevented from being burnt out due to the fact that the external light is too strong.

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

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 shows a schematic diagram of the imaging principle of a head-up display and the potential for burn-in;

fig. 2 is a schematic diagram illustrating a first structure of a head-up display device according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a screen burn-in prevention principle of a head-up display device according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a second structure of a head-up display device according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a third structure of a head-up display device according to an embodiment of the present invention;

fig. 6 is a fourth schematic structural diagram of a head-up display device according to an embodiment of the present invention;

fig. 7 shows a fifth schematic structural diagram of a head-up display device according to an embodiment of the present invention.

Icon:

10-head-up display body, 20-reflection device, 100-light transmission element, 110-image source, 120-curved mirror and 130-plane mirror.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

An embodiment of the utility model provides a pair of new line display device, it is shown with reference to fig. 2, include: a light transmitting element 100 and a head-up display body 10 having an image source 110.

In the embodiment of the present invention, the light transmission element 100 is used for transmitting the light with the first characteristic and reflecting or absorbing the light with the second characteristic; the second characteristic is a different characteristic from the first characteristic; and the light transmitting element 100 is disposed on the light path from the image source 110 to the external reflection device 20. Wherein, the imaging light emitted from the image source 110 can be directly incident on the reflection device 20, so as to be imaged by the reflection device 20; alternatively, the imaging light emitted from the image source 110 is first incident on the concave curved mirror 120, reflected by the curved mirror 120, and then transmitted to the reflecting device 20, as shown in fig. 2. When the head-up display body 10 includes other reflective elements, the light transmitting element 100 may be disposed between the image source 110 and the reflective element, between the reflective element and the reflective device 20, or between two reflective elements, and it is only necessary to ensure that the light transmitting element 100 is disposed on the light path from the image source 110 to the external reflective device 20. Specifically, the reflecting element is disposed on the propagation path of the imaging light, and is used for reflecting the imaging light and finally reflecting the imaging light to the external reflecting device 20; the reflective element may be a curved mirror or a flat mirror. Fig. 2 illustrates the light transmitting device 100 disposed between the image source 110 and the curved mirror 120. In this embodiment, the head-up display body may include one or more reflective elements, which may be curved mirrors or flat mirrors, and at least one of the reflective elements is a curved mirror; that is, the head-up display body may include one or more curved mirrors, or one curved mirror and one flat mirror, or one curved mirror and a plurality of flat mirrors, and the like. The curved mirror may be a free-form surface mirror, a spherical mirror, a hyperboloid mirror, a parabolic mirror, or the like.

The reflection device 20 is a transparent device with a reflection function, and may be a component additionally disposed in the automobile and having a function of reflecting the imaging light, or may be a windshield of the automobile, or a transparent reflection film coated on an inner side of the windshield, which is not limited in this embodiment. In fig. 2, the reflecting device 20 is illustrated as a windshield.

In the embodiment of the present invention, the image source 110 is used for emitting an image light having the first characteristic, and the image light is incident to the reflection device 20 after passing through the light transmission element 100. Since the light transmissive element 100 is capable of transmitting light with the first characteristic, the imaging light emitted from the image source 110 can be transmitted through the light transmissive element 100 and imaged by the external reflection device 20, i.e. the light transmissive element 100 does not affect the imaging process of the head-up display device. Meanwhile, since the light transmission element 100 can reflect or absorb the light with the second characteristic, when the external light is incident into the head-up display device, the light transmission element 100 can absorb or reflect the light with the second characteristic in the external light, so that the intensity of the external light incident to the image source 110 can be reduced, and the image source 110 is prevented from being burnt out due to the excessively strong external light.

Specifically, referring to fig. 3, in a normal operation state, the image source 110 emits imaging light a with the first characteristic, the imaging light a is transmitted through the light transmission element 100 and then enters the curved mirror 120, and is reflected by the reflecting action of the curved mirror 120 to the reflecting device 20, so that a virtual image is formed outside the reflecting device 20 for the driver to watch. When the external sun is located in a specific position of the vehicle, the sunlight B emitted by the sun can just pass through the light outlet of the head-up display body and enter the interior of the head-up display body, and then the sunlight B can enter the curved mirror 120, and the curved mirror 120 can reflect the sunlight B to the light transmission element 100; because the sunlight B is natural light and is mixed with light rays with various characteristics, at this time, the light rays with the second characteristic in the sunlight B are absorbed or reflected by the light ray transmission element 100, and only the light rays C with the first characteristic in the sunlight B can penetrate through the light ray transmission element 100 and reach the image source 110, so that partial light rays in external sunlight can be filtered or blocked by the light ray transmission element 100, the illumination intensity of the incident light to the image source 110 is reduced, and the image source 110 is prevented from being burnt by external sunlight.

It will be understood by those skilled in the art that since the head-up display body may include the image source 110, and may also include a reflective element, such as a curved mirror 120, for changing the propagation direction of the light path, the imaging light may be incident on the reflective element after passing through the light transmissive element 100, and then the imaging light is reflected to the reflective device 20 by the reflective element, in this embodiment, "the imaging light is incident on the reflective device 20 after passing through the light transmissive element 100" is not used to limit that the imaging light is directly emitted to the reflective device 20 after passing through the light transmissive element 100, and the imaging light may also be indirectly emitted to the reflective device 20 after passing through one or more reflective elements after passing through the light transmissive element 100. In addition, the "light outlet" of the head-up display body refers to an opening for emitting imaging light from the image source, but external light may also enter the interior of the head-up display body through the "light outlet", that is, the "light outlet" is a light inlet for external light.

According to the head-up display device provided by the embodiment of the utility model, the light transmission element is arranged in the head-up display body, and the head-up display device can normally image by utilizing the characteristic that the light transmission element can transmit imaging light with the first characteristic; meanwhile, a part of external light can be filtered, namely the light with the second characteristic can be absorbed or reflected, so that the illumination intensity of the external light entering the image source can be reduced, and the image source can be prevented from being burnt out due to the fact that the external light is too strong.

On the basis of the above-described embodiment, when the reflection device 20 is mainly used for imaging (for example, the reflection device 20 is a reflection surface additionally provided to the head-up display apparatus, etc.), the light transmission element 100 is disposed on the optical path between the image source 110 and the reflection device 20. When the reflection device 20 for image formation needs to transmit external ambient light in addition to image formation (for example, the reflection device 20 is a windshield or the like), the light transmission element 100 is disposed on the optical path from the image source 110 to the opening of the head-up display body 10. That is, the light transmitting element 100 is not disposed between the opening of the head-up display body 10 and the reflection device 20. When the light transmission element 100 is disposed between the opening of the head-up display body 10 and the reflection device 20, although external light can be blocked from entering the head-up display body, light of a road or an environment outside the vehicle can be partially filtered by the light transmission element 100, which may affect an observer to normally view a scene outside the vehicle. In this embodiment, the light transmitting element 100 is disposed on the light path from the image source 110 to the opening of the head-up display body 10, so as to avoid the above-mentioned problem.

Specifically, when the head-up display body 10 includes a reflective element (e.g., a curved mirror 120), the light transmissive element 100 can be disposed between the image source 110 and the reflective element, as shown in fig. 2; alternatively, the light transmitting element 100 may be disposed between the reflective element and the light outlet of the head-up display body 10, as shown in fig. 4.

Optionally, since a space for installing the head-up display device in the vehicle is limited, in order to ensure that the image source is located near a focal plane of the curved mirror and reduce the volume of the head-up display device, at least one reflective element in the head-up display body 10 is a plane mirror, that is, the head-up display body 10 includes the curved mirror and the plane mirror, and an imaging light path through which imaging light propagates is adjusted by the plane mirror, thereby reducing the volume of the head-up display body. Referring to fig. 5, in the embodiment, a flat mirror 130 is disposed inside the head-up display body 10, and the flat mirror 130 is disposed on an imaging optical path between the image source 110 and the curved mirror 120. As shown in fig. 5, the plane mirror 130 can change the imaging optical path of the image source 110, so as to change the relative position between the image source 110 and the curved mirror 120; at the same time, the virtual image of the image source 110 in the plane mirror 130 is still near the focal plane of the curved mirror 120, i.e. essentially the image source 110 is still near the focal plane of the curved mirror 120, and the head-up display body 10 can be normally imaged on the reflection device 20. Preferably, image source 110 may be located at the focal plane of curved mirror 120, or alternatively, image source 110 may be located within one focal length of curved mirror 120, i.e., image source 110 is located at the side of the focal plane of curved mirror 120 that is closer to curved mirror 120.

In this embodiment, the light transmitting element 100 may be disposed between the image source 110 and the light outlet of the head-up display body 10, and the light transmitting element 100 is illustrated between the image source 110 and the plane mirror 130 in fig. 5. Alternatively, referring to fig. 6, the light transmitting element 100 is disposed between the curved mirror 120 and the flat mirror 130; alternatively, referring to fig. 7, the light transmitting element 100 is disposed between the curved mirror 120 and the light outlet of the head-up display body 10.

When the head-up display body 10 includes more reflective elements, the distance between the image source 110 and the curved mirror 120 is adjusted accordingly, only the distance between the image source 110 and the focal plane of the curved mirror 120 needs to be ensured to be smaller than the predetermined distance, that is, the image source 110 is close to the focal plane of the curved mirror 120. The preset distance is a preset distance threshold, and the preset distance may be set manually or determined based on the size of the head-up display device or the imaging distance of the head-up display device, which is not limited herein; for example, the predetermined distance may be 10cm, 1cm, 5mm, etc., as long as the distance between the image source 110 and the focal plane of the curved mirror 120 is sufficiently small, or the predetermined distance may be 0, i.e., the image source 110 is disposed at the focal plane of the curved mirror 120. In addition, the light transmitting element 100 only needs to be on the transmission path of the imaging light, similar to those shown in fig. 5 to 7, and the specific position of the light transmitting element 100 is not limited in this embodiment.

The light ray described in this embodiment has multiple characteristics, such as the first characteristic, the second characteristic, and the like, and essentially means that the light ray can be decomposed into light rays with multiple characteristics. The characteristic of the light may specifically be a polarization characteristic (i.e., a polarization state), a wavelength characteristic, a phase characteristic, a direction characteristic, or the like.

Specifically, in the embodiment of the present invention, the first characteristic and the second characteristic are two different polarization characteristics, that is, the first characteristic is a first polarization characteristic, and the second characteristic is a second polarization characteristic. The polarization characteristics specifically include linear polarization, circular polarization, elliptical polarization, and the like. In this embodiment, if the polarization directions of the two linear polarizations are different, the polarization characteristics of the two linear polarizations are also different; the included angles of the slow axes of the two elliptical polarizations are different, and the polarization characteristics can also be considered to be different; the polarization characteristics are different if the two circular polarizations have different rotation directions (left-hand or right-hand). Accordingly, the light transmitting element 100 may be a selective wavelength transmitting film or a selective polarization transmitting film.

In this embodiment, the light transmitting element 100 may be an optical film with selective transmittance and reflectance based on the existing process; specifically, the light transmitting element 100 may be an optical film made of an inorganic dielectric material or an organic polymer material, and the optical film is formed by stacking at least two film layers having different refractive indexes. The term "different refractive index" as used herein means that the refractive index of the film layer is different in at least one of the three directions xyz; by selecting desired film layers with different refractive indexes in advance and stacking the film layers according to a preset sequence, an optical film with selective reflection and selective transmission characteristics can be formed, the optical film can selectively transmit light with the first characteristic and selectively reflect or absorb light with the second characteristic, and the optical film can be used as the light transmission element 100 in this embodiment.

Specifically, for the film layer of the inorganic dielectric material, the composition of the film layer is selected from 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. For the film layer of the organic high molecular material, the film layer of the organic high molecular material comprises at least two thermoplastic organic polymer film layers; the two thermoplastic polymer film layers are alternately arranged to form the optical film, and the refractive indexes of the two thermoplastic polymer film layers are different. The molecules of the organic polymer material are in a chain structure, and the molecules are arranged in a certain direction after being stretched, so that the refractive indexes in different directions are different, namely, the required film can be formed through a specific stretching process. The thermoplastic polymer may be PET (polyethylene terephthalate) and its derivatives with different degrees of polymerization, PEN (polyethylene naphthalate) and its derivatives with different degrees of polymerization, PBT (polybutylene terephthalate) and its derivatives with different degrees of polymerization, and the like, which is not limited in this embodiment.

In this embodiment, the image source 110 can emit light with a specific polarization characteristic, for example, an LCD (liquid crystal Display) image source can emit linearly polarized light with a specific polarization direction, a DLP (digital light Processing) image source, a diffuser, an image source composed of a backlight module, and the like can all emit specific polarized light. In the embodiment, the image source 110 is taken as an LCD as an example, and based on the imaging principle of liquid crystal, the light emitted from the image source 110 at this time is linearly polarized with a specific polarization direction, for example, the linear polarization with the polarization direction parallel to the long side of the liquid crystal display. In this embodiment, the imaging light emitted from the image source 110 is a linearly polarized light having a first polarization direction, that is, the first characteristic is: linear polarization of the first polarization direction, and accordingly, the second characteristic is: linear polarization of the second polarization direction. Preferably, the first polarization direction is perpendicular to the second polarization direction, and the light transmission element 100 can more effectively distinguish the light having the first characteristic from the light having the second characteristic, so that the light having the second characteristic can be more effectively absorbed or reflected. In the embodiment of the present invention, the "second characteristic is a characteristic different from the first characteristic" means that the first characteristic is not completely the same as the second characteristic. For example, the first characteristic is linear polarization and the second characteristic is circular polarization; or the first characteristic is a 500nm wavelength, the second characteristic is a 600nm wavelength, or the second characteristic is a wavelength other than 500 nm; or the first characteristic is linear polarization with a wavelength of 500nm, the second characteristic is linear polarization with a wavelength of 600nm, etc.

In addition, the image source 110 may also emit imaging light with circular polarization or elliptical polarization, where the first polarization characteristic is left-handed circular polarization and the second polarization characteristic is right-handed circular polarization; or

The first polarization characteristic is right-handed circular polarization, and the second polarization characteristic is left-handed circular polarization; or

The first polarization characteristic is left-handed elliptical polarization, and the second polarization characteristic is right-handed elliptical polarization; or

The first polarization characteristic is right-handed elliptical polarization and the second polarization characteristic is left-handed elliptical polarization.

In this embodiment, the first characteristic and the second characteristic are two linear polarizations in which polarization directions are perpendicular, for example. The natural light can be decomposed into two linear polarizations with perpendicular polarization directions, that is, the natural light can be decomposed into a linearly polarized light line with a first polarization direction and a linearly polarized light line with a second polarization direction, and the light transmission element 100 in this embodiment can reflect or absorb the linearly polarized light line with the second polarization direction. As shown in fig. 3, when the natural light B passes through the light transmission element, the linearly polarized light C with the first polarization direction can pass through the light transmission element 100 and reach the image source 110, and the linearly polarized light C with the second polarization direction in the natural light B is absorbed or reflected by the light transmission element 100, that is, 50% of the light in the natural light B is absorbed or reflected by the light transmission element 100, so that the light energy of 50% of the external light can be reduced, and the image source 110 is effectively prevented from being burned out by the external light.

Further, as described above, the characteristic of the light in the present embodiment may be a wavelength characteristic. In this embodiment, the first characteristic comprises one or more spectral bands; at this time, the second characteristic may be a band including another band different from the band of the first characteristic. For example, the first characteristic may include a wavelength band of 500nm to 600nm, in which case the second characteristic may be a band of 600nm to 700nm, or a band other than 500nm to 600 nm.

Specifically, when the image source 110 needs to form a color image, the imaging light emitted from the image source 110 includes at least three spectral bands, for example, the light emitted from the image source 110 is RGB three-spectral band. In this embodiment, the first characteristic comprises at least three non-overlapping spectral bands; the central point of the first of the at least three bands is located between 410nm and 480nm, which corresponds to the blue (B) band; the central point of the second band is located between 500nm and 565nm, which corresponds to the green (G) band; the third band has a center point between 590nm and 690nm, which corresponds to the red (R) band.

In this embodiment, the central point of the spectral band may be an average value of two critical values of the spectral band, or may be a certain point in the spectral band determined in other manners, which is not limited in this embodiment. For example, if the band is 500nm to 600nm, the two critical values before and after the band are 500nm and 600nm, respectively, 550nm can be used as the center point of the band. In addition, in order to ensure the imaging effect of the image source 110, it is necessary to avoid the excessive bandwidth; the width of the spectral band in this embodiment is not more than 50nm to ensure a wide color gamut (color gamut) when imaging the image source.

In the embodiment of the present invention, it is assumed that the natural light is visible light, the width of the spectral band is 400nm, if the first characteristic includes three spectral bands, and the total width of the three spectral bands is 100 nm; meanwhile, the second characteristic is other than the first characteristic, that is, the total band width of the second characteristic is 300 nm. Referring to fig. 3, when the natural light B is emitted to the light transmission element 100, the light having the width of 300nm (i.e., the light having the second characteristic) in the natural light B is reflected or absorbed by the light transmission element 100, and only the light having the width of 100nm C (i.e., the light having the first characteristic) can be emitted to the image source 110. Assuming that the energy of the light beams with different wavelengths is the same, it can be considered that only 25% of the light beams in the natural light can be incident on the image source 110, so that the illumination intensity incident on the image source 110 can also be reduced. In addition, since the external light is required to pass through the windshield before being emitted into the head-up display body 10, the windshield itself can reflect part of the light, so that the light entering the head-up display body 10 is less.

Optionally, in this embodiment, the first characteristic includes one or more spectral bands having a predetermined polarization state. Specifically, the image source 110 may emit Light with a specific polarization characteristic, for example, an LCD (Liquid Crystal Display) image source may emit linearly polarized Light with a specific polarization direction, a DLP (Digital Light Processing) image source, a diffuser, an image source composed of a backlight module, and the like may all emit Light with a specific polarization. In this embodiment, the image source 110 is taken as an LCD for illustration, the imaging light emitted by the image source 110 may be linearly polarized light of three colors RGB, that is, the first characteristic includes three spectral bands, and the light of each spectral band is linearly polarized light in the first polarization direction. At this time, the second characteristic may be other than the first characteristic, that is, the light transmission element 100 absorbs or reflects all of the external light except for the RGB three spectral bands of the linearly polarized light of the first polarization direction. For convenience of explanation, taking the first characteristic as an example that the first characteristic includes only one spectral band, the spectral band is 500nm to 600nm and is linearly polarized in a first polarization direction, if the spectral band of some part of the external light is 600nm to 700nm and is linearly polarized in a second polarization direction, the light is light with a second characteristic; alternatively, if a certain part of the external light has a band of 500nm to 600nm but is linearly polarized in the second polarization direction, the part of the external light may be regarded as light having the second characteristic.

Still taking the width of the natural spectral band as 400nm as an example, since the optical line width of the first characteristic is 100nm, the light transmission element 100 can filter 75% of external natural light, i.e. allow 25% of external natural light to transmit; meanwhile, the light transmission element 100 can further filter out the linear polarization of the second polarization direction, that is, 50% of light can be further filtered out, and finally, only 12.5% of light of external natural light can penetrate through the light transmission element 100, so that the filtering and blocking effects of the light transmission element 100 on the external light can be further improved.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A head-up display device, comprising: a light transmitting element and a head-up display body having an image source;

2. The heads-up display apparatus of claim 1 wherein the light transmissive element is disposed in an optical path between the image source and the light exit of the heads-up display body.

3. The head-up display device according to claim 1 or 2, wherein the first characteristic is a first polarization characteristic and the second characteristic is a second polarization characteristic.

4. The head-up display device of claim 3,

the first polarization characteristic is linear polarization in a first polarization direction, the second polarization characteristic is linear polarization in a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction; or

The first polarization characteristic is left-handed circular polarization, and the second polarization characteristic is right-handed circular polarization; or

The first polarization characteristic is right-handed elliptical polarization, and the second polarization characteristic is left-handed elliptical polarization.

5. The heads-up display device of claim 1 or 2 wherein the first characteristic comprises one or more spectral bands.

6. The heads-up display device of claim 5 wherein the width of the spectral band is no greater than 50 nanometers.

7. The heads-up display device of claim 5 wherein the first characteristic includes at least three non-overlapping spectral bands;

the central point of the first band of the at least three bands is between 410nm and 480nm, the central point of the second band is between 500nm and 565nm, and the central point of the third band is between 590nm and 690 nm.

8. The heads-up display device of claim 5 wherein the first characteristic includes one or more spectral bands having a predetermined polarization state.

9. The heads-up display device of any one of claims 1, 2, 4, 6-8, wherein the heads-up display body further comprises: one or more reflective elements, the reflective elements being curved or flat mirrors, and at least one of the reflective elements being a curved mirror;

the reflecting element is arranged on the propagation path of the imaging light rays, and is used for reflecting the imaging light rays and finally reflecting the imaging light rays to an external reflecting device.

10. The head-up display device according to claim 1, 2, 4, 6-8, wherein the light transmitting element is an optical film made of an inorganic dielectric material or an organic polymer material, and the optical film is formed by stacking at least two film layers having different refractive indexes.