CN213092017U - Multilayer image display device, head-up display, and transportation apparatus - Google Patents

Abstract

A multi-layered image display device, a head-up display, and a transportation apparatus. The display device comprises an image source, a first reflecting element and a second reflecting element. The image source comprises at least two display areas; the first reflecting element is positioned on the display side of the image source and is configured to reflect image light rays emitted by at least two display areas; and the second reflecting element is positioned on one side of the first reflecting element facing the image source and is configured to reflect the image light rays reflected from the first reflecting element to the second reflecting element. The optical distances of the image light rays emitted from the at least two display regions to the second reflecting element are different. The display device provided by the embodiment of the disclosure can form images at different distances, and is beneficial to matching and fusing images at different distances and live-action scenes at different distances, so that a user does not need to switch back and forth between the images at fixed distances and the live-action scenes at different distances, the conflict of convergence adjustment of vision is avoided, and the use experience of the display device is improved.

Description

Multilayer image display device, head-up display, and transportation apparatus

Technical Field

At least one embodiment of the present disclosure relates to a multi-layered image display device, a head-up display, and a transportation apparatus.

Background

Head-Up Display (HUD) ware can utilize reflection type optical design, through projecting the image light (including vehicle information such as speed of a motor vehicle) that the image source sent on imaging window (for example structures such as windshield, formation of image board) to make the driver need not to look down the panel board and just can directly see information at driving in-process, can improve driving safety factor, can bring better driving experience again.

The distance between the image displayed by the head-up display and the human eyes is fixed when the head-up display is used, and during the running process of a vehicle applying the head-up display, the real scene around the vehicle, such as a building, a pedestrian or other vehicles, moves relative to the vehicle, so that the distance between the real scene around the vehicle and a driver continuously changes.

SUMMERY OF THE UTILITY MODEL

At least one embodiment of the present disclosure provides a multi-layered image display device, a head-up display, and a transportation apparatus.

At least one embodiment of the present disclosure provides a multi-layered image display device, including: the image source, the first reflecting element and the second reflecting element. The image source comprises at least two display areas, wherein the at least two display areas comprise a first display area and a second display area; the first reflecting element is positioned on the display side of the image source and is configured to reflect the image light rays emitted by the at least two display areas; the second reflective element is located on a side of the first reflective element facing the image source and is configured to reflect the image light reflected from the first reflective element toward the second reflective element. The first reflection element includes a first sub reflection element and a second sub reflection element, the first sub reflection element is configured to reflect the image light emitted from the first display region to the second reflection element, the second sub reflection element is configured to reflect the image light emitted from the second display region to the second reflection element, and optical distances of the image light emitted from the at least two display regions to the second reflection element are different.

For example, in an embodiment of the present disclosure, an optical distance of the image light emitted from the first display region to the second reflective element is smaller than an optical distance of the image light emitted from the second display region to the second reflective element.

For example, in an embodiment of the present disclosure, the second display area is located on a side of the first display area away from the second reflective element, the second sub reflective element is located on a side of the first sub reflective element away from the second reflective element, and a distance between a center of the second sub reflective element and the second display area is greater than a distance between a center of the first sub reflective element and the first display area.

For example, in an embodiment of the present disclosure, the first display region and the second display region are parallel, and an angle difference between the reflective surface of the first sub-reflective element and the reflective surface of the second sub-reflective element is not greater than 20 °.

For example, in an embodiment of the present disclosure, the image source includes a first sub image source, the first display area and the second display area are both located on the first sub image source, and a light shielding structure is disposed between the first display area and the second display area.

For example, in an embodiment of the present disclosure, an area of the first display region is smaller than an area of the second display region.

For example, in an embodiment of the present disclosure, the first sub-reflective element and the second sub-reflective element are a unitary structure.

For example, in an embodiment of the present disclosure, the at least two display regions further include a third display region, the first reflective element further includes a third sub-reflective element, the third sub-reflective element is configured to reflect the image light emitted from the third display region to the second reflective element, and an included angle between the first display region and the third display region is 5 ° to 90 °.

For example, in an embodiment of the disclosure, an optical distance of the image light emitted from the first display region to the second reflective element is smaller than an optical distance of the image light emitted from the third display region to the second reflective element, and an optical distance of the image light emitted from the third display region to the second reflective element is smaller than an optical distance of the image light emitted from the second display region to the second reflective element.

For example, in an embodiment of the present disclosure, the third display area is located on a side of the second display area away from the second reflective element, the third sub reflective element is located on a side of the second sub reflective element away from the second reflective element, and a distance between a center of the third sub reflective element and the third display area is smaller than a distance between a center of the first sub reflective element and the first display area.

For example, in an embodiment of the present disclosure, the first sub-reflective element, the second sub-reflective element, and the third sub-reflective element are all planar mirrors.

For example, in an embodiment of the present disclosure, the third display region is located on a side of the first display region close to the second reflective element, the third sub-reflective element is located on a side of the first sub-reflective element close to the second reflective element, and the first sub-reflective element and the second sub-reflective element are both plane mirrors, and the third sub-reflective element is a transflective element and is configured to transmit at least one of the first sub-reflective element and the second sub-reflective element and reflect the image light toward the second reflective element.

For example, in an embodiment of the present disclosure, the transflective element includes a polarizing transflective element, the third display region emits light of a first polarization, at least one of the first display region and the second display region emits light of a second polarization, polarization directions of the first polarized light and the second polarized light are perpendicular, and the transflective element is configured to reflect the first polarized light and transmit the second polarized light.

For example, in an embodiment of the disclosure, the transflective element is a wavelength transflective element, a wavelength band in which the image light emitted from the third display region is located is a first wavelength band group, a wavelength band in which the image light emitted from at least one of the first display region and the second display region is located is a second wavelength band group, and the transflective element is configured to reflect the image light of the first wavelength band group and transmit the image light of the second wavelength band group.

For example, in an embodiment of the present disclosure, the image source further includes a second sub image source, and the third display region is located on the second sub image source.

At least one embodiment of the present disclosure provides a head-up display including the display device and a reflective imaging portion. The reflective imaging part is located on the light emitting side of the second reflecting element, and is configured to reflect the image light reflected to the reflective imaging part from the second reflecting element to an observation area and transmit ambient light.

For example, in an embodiment of the present disclosure, a distance between a first virtual image, which is formed by reflecting the image light emitted by the first display area by the reflective imaging part, and the observation area is 2 to 4 meters, and a distance between a second virtual image, which is formed by reflecting the image light emitted by the second display area by the reflective imaging part, and the observation area is 20 to 50 meters.

For example, in an embodiment of the present disclosure, the at least two display regions further include a third display region, the first reflective element further includes a third sub-reflective element, the third sub-reflective element is configured to reflect the image light emitted from the third display region to the second reflective element, and an included angle between the first display region and the third display region is 5 ° to 90 °; the optical distance of the image light rays emitted from the first display area to the second reflecting element is smaller than the optical distance of the image light rays emitted from the third display area to the second reflecting element, and the optical distance of the image light rays emitted from the third display area to the second reflecting element is smaller than the optical distance of the image light rays emitted from the second display area to the second reflecting element.

For example, in the embodiment of the present disclosure, a distance between a third virtual image formed by the image light emitted by the third display region being reflected by the reflective imaging section and the observation region is 7 to 14 meters, the first virtual image is parallel to the second virtual image, and an included angle between the third virtual image and the first virtual image is 5 to 90 °.

For example, in an embodiment of the present disclosure, the first virtual image and the second virtual image are perpendicular to the ground, and an end of the third virtual image far from the ground is farther away from the observation area than an end of the third virtual image close to the ground.

For example, in an embodiment of the present disclosure, a virtual image of the second display region reflected by the second reflective element is located at a focal plane of the reflective imaging section.

For example, in an embodiment of the present disclosure, the head-up display further includes a package housing having an opening, wherein the image source, the first reflective element and the second reflective element are all located in the package housing, the reflective imaging part is located outside the package housing, and the image light emitted from the opening of the package housing is reflected by the reflective imaging part to the viewing area.

For example, in an embodiment of the present disclosure, a transparent dustproof film is disposed at the opening position to enclose the opening, a light shield is disposed outside the transparent dustproof film, the light shield does not pass through an optical path of image light emitted from the opening to the reflective imaging part, and the light shield is configured to shield a part of ambient light.

At least one embodiment of the present disclosure provides a transportation device including the above head-up display.

For example, in an embodiment of the present disclosure, the reflective imaging portion is a windshield of the transportation device.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 is a partial structural schematic diagram of a display device provided according to an example of an embodiment of the present disclosure;

fig. 2 is a partial structural schematic view of a display device provided according to another example of an embodiment of the present disclosure;

FIG. 3 is a schematic plan view of the sub-image source shown in FIG. 1;

fig. 4 is a partial structural schematic view of a display device provided according to another example of an embodiment of the present disclosure;

fig. 5 is a partial structural schematic view of a display device provided according to another example of an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a head-up display according to an example of another embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a package body in the head-up display shown in FIG. 6;

fig. 8 is a schematic structural diagram of a heads-up display provided in accordance with another example of another embodiment of the present disclosure;

fig. 9A to 9D are schematic structural diagrams of a reflective light guide element according to an embodiment of the disclosure;

FIG. 10 is a schematic structural diagram of a combination of a light beam converging element and a reflective light guiding element according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of an optical path of a combination of a reflective light guide element, a beam converging element and a beam diverging element provided in accordance with an embodiment of the present disclosure;

fig. 12 is a schematic partial structure diagram of a head-up display according to another example of another embodiment of the present disclosure;

fig. 13 is a schematic partial structure diagram of a heads-up display according to another example of another embodiment of the present disclosure;

fig. 14 is a schematic partial structure diagram of a head-up display according to another example of another embodiment of the present disclosure; and

fig. 15 is an exemplary block diagram of a transportation device provided in accordance with another embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.

The terms "parallel," "perpendicular," and "the same" as used in the embodiments of the present disclosure include the strict terms "parallel," "perpendicular," "the same," and the terms "substantially parallel," "substantially perpendicular," "substantially the same," and the like, include certain errors, which are within the acceptable range of deviation for a particular value, as determined by one of ordinary skill in the art, in view of the error associated with measuring a particular value (i.e., the limitations of the measurement system). For example, "substantially" can mean within one or more standard deviations, or within 10% or 5% of the stated value.

In the research, the inventors of the present application found that: when the head-up display is used, the distance between the displayed image and human eyes is generally fixed, for example, the distance between the image and the human eyes is about 5-20 m. When the head-up display is used for displaying images, a user (such as a driver) needs to switch the line of sight between the image with a fixed distance displayed by the head-up display and the live-action with different distances, so that the visual convergence adjustment conflict is easy to occur, and visual fatigue phenomena such as blurring and dizziness occur to the driver, thereby seriously reducing the use experience of the head-up display.

Embodiments of the present disclosure provide a multi-layered image display device, a head-up display, and a transportation apparatus. The display device comprises an image source, a first reflecting element and a second reflecting element. The image source comprises at least two display areas, and the at least two display areas comprise a first display area and a second display area; the first reflecting element is positioned on the display side of the image source and is configured to reflect image light rays emitted by at least two display areas; the second reflective element is positioned on a side of the first reflective element facing the image source and is configured to reflect image light reflected from the first reflective element toward the second reflective element. The first reflection element comprises a first sub reflection element and a second sub reflection element, the first sub reflection element is configured to reflect the image light rays emitted by the first display area to the second reflection element, the second sub reflection element is configured to reflect the image light rays emitted by the second display area to the second reflection element, and the optical distances of the image light rays emitted from at least two display areas to the second reflection element are different. The display device provided by the embodiment of the disclosure is a multilayer image display device, can form images at different distances, and is beneficial to matching and fusing images at different distances and live-action scenes at different distances, so that when the display device is applied to a head-up display, a user does not need to switch back and forth between the images at fixed distances and the live-action scenes at different distances, thereby avoiding the conflict of convergence adjustment of vision and improving the use experience of the display device.

The multilayer image display device, the head-up display, and the transportation apparatus provided in the embodiments of the present disclosure are described below with reference to the drawings.

Fig. 1 is a partial structural schematic diagram of a display device according to an example of an embodiment of the present disclosure. As shown in fig. 1, the display device includes an image source 100, a first reflective element 200, and a second reflective element 300. The image source 100 includes at least two display regions 110. The first reflective element 200 is located on the display side of the image source 100 and configured to reflect the image light emitted from the at least two display regions 110; the second reflective element 300 is located on a side of the first reflective element 200 facing the image source 100 and is configured to reflect image light reflected from the first reflective element 200 toward the second reflective element 300. For example, image light emitted by the image source 100 is reflected by the first reflective element 200 towards the second reflective element 300. The optical distances of the image light rays exiting from the at least two display regions 110 to the second reflective element 300 are different. For example, the image light rays emitted from the at least two display regions 110 are reflected to the second reflecting element 300 through the first reflecting element 200, and in the reflected light path, the optical distances of the image light rays of the at least two display regions 110 are different so that the distances from the user to the at least two virtual images reflected by the second reflecting element 300 are different. The "optical distance" refers to the product of the geometric distance of the image light rays emitted from the display region to the second reflective element and the refractive index of the propagation medium. The above-mentioned "display side of the image source" refers to the side of the image source from which light is emitted.

In the display device provided by the embodiment of the disclosure, the optical distances of the image light emitted from the at least two display areas to the second reflection element are different, so that images can be formed at different distances, matching and fusion of the images at different distances and the live-action scenes at different distances are facilitated, and when the display device is applied to a head-up display, a user does not need to switch back and forth between the images at fixed distances and the live-action scenes at different distances, so that a visual convergence adjustment conflict is avoided, and the use experience of the display device is improved.

For example, each of the at least two display regions 110 may display a different image to meet the user's desire to view the different image. Of course, the embodiments of the present disclosure are not limited thereto, and some of the at least two display regions may also display the same image.

For example, the first reflective element 200 may include at least two sub-reflective elements, and the at least two display regions 110 may correspond to the at least two sub-reflective elements in a one-to-one manner such that different sub-reflective elements may reflect image light displayed by different display regions toward the second reflective element. The embodiment of the disclosure is not limited thereto, and the image light rays emitted from the at least two display regions may also be all incident on the same first reflective element as long as the optical distances of the image light rays emitted from the at least two display regions to the second reflective element are different.

As shown in fig. 1, the at least two display regions 110 include a first display region 111 and a second display region 112, the first reflective element 200 includes a first sub-reflective element 210 and a second sub-reflective element 220, the first sub-reflective element 210 is configured to reflect the image light emitted from the first display region 111 to the second reflective element 300, and the second sub-reflective element 220 is configured to reflect the image light emitted from the second display region 112 to the second reflective element 300.

For example, as shown in fig. 1, the geometric distance of the image light emitted from the first display region 111 to the reflection surface of the first sub-reflection element 210 is a1, the geometric distance of the image light reflected from the first sub-reflection element 210 to the reflection surface of the second sub-reflection element 300 is a2, and taking the example that the image light emitted from the first display region 111 propagates in the air (the refractive index n is about 1), the optical distance of the image light emitted from the first display region 111 to the second sub-reflection element 300 is (a1+ a 2). For example, the optical distance of the image light emitted from the first display region 111 to the second reflective element 300 is equal to the optical distance experienced by the main transmission light emitted from the first display region 111 to the first sub-reflective element 210 plus the optical distance experienced by the main transmission light reflected from the first sub-reflective element 210 to the second reflective element 300.

For example, as shown in fig. 1, the geometric distance of the image light emitted from the second display region 112 to the reflection surface of the second sub-reflection element 220 is B1, the geometric distance of the image light reflected from the second sub-reflection element 220 to the reflection surface of the second reflection element 300 is B2, and taking the example that the image light emitted from the second display region 112 propagates in the air (the refractive index n is about 1), the optical distance of the image light emitted from the second display region 112 to the second reflection element 300 is (B1+ B2), and (a1+ a2) ≠ (B1+ B2). For example, the optical distance of the image light emitted from the second display region 112 to the second reflective element 300 is equal to the optical distance experienced by the main transmission light emitted from the second display region 112 to the second sub-reflective element 220 plus the optical distance experienced by the main transmission light reflected from the second sub-reflective element 220 to the second reflective element 300.

The disclosed embodiment can achieve the purpose of different optical distances of image light rays emitted from at least two display areas to the second reflecting element by adjusting the distance between the first sub reflecting element and the first display area and the second reflecting element and the distance between the second sub reflecting element and the second display area and the second reflecting element.

For example, the second reflective element 300 may be a curved mirror, e.g., the curved mirror may be a concave mirror; in this case, the surface of the concave reflector adjacent to the display area is a concave surface.

For example, in the case where the curved mirror is a concave mirror (that is, a mirror whose reflection surface is a concave curved surface), if the optical distance between the display region and the concave mirror is smaller than the focal length of the concave mirror, the concave mirror forms an erect enlarged virtual image based on an image output from the display region. For example, according to the imaging property of the concave mirror, in the case that the optical distance between the display area and the concave mirror is smaller than the focal length of the concave mirror (that is, the display area is located within one focal length of the concave mirror), the image distance of the concave mirror increases with the increase of the optical distance between the display area and the concave mirror, that is, the larger the optical distance between the display area and the concave mirror, the larger the distance between the user using the head up display including the display device and the image viewed by the user is.

For example, the reflective surface of the second reflective element 300 may be a free-form surface, that is, the reflective surface of the second reflective element 300 does not have a rotational symmetry characteristic, so as to improve the imaging quality of the display device.

For example, as shown in fig. 1, the first display region 111 and the second display region 112 are parallel, and the angle difference between the reflection surface of the first sub-reflection element 210 and the reflection surface of the second sub-reflection element 220 is not greater than 20 °, so that virtual images formed by the reflection of the image light rays displayed in the first display region and the second display region by the second reflection element are substantially parallel.

For example, as shown in fig. 1, the difference in angle between the reflection surface of the first sub-reflection element 210 and the reflection surface of the second sub-reflection element 220 is not more than 15 °. For example, the difference in angle between the reflective surface of the first sub-reflective element 210 and the reflective surface of the second sub-reflective element 220 is not more than 10 °. For example, the difference in angle between the reflective surface of the first sub-reflective element 210 and the reflective surface of the second sub-reflective element 220 is not more than 5 °. For example, the reflective surface of the first sub-reflective element 210 and the reflective surface of the second sub-reflective element 220 are disposed in parallel.

For example, the first sub-reflection element 210 and the second sub-reflection element 220 may be plane mirrors, and the above-mentioned "the angle difference of the reflection surface of the first sub-reflection element 210 and the reflection surface of the second sub-reflection element 220 is not more than 15 °" may mean that the angle difference of the two plane reflection surfaces is not more than 15 °.

For example, the first sub-reflecting element 210 and the second sub-reflecting element 220 may be at least one of a curved mirror, an aspherical mirror, and a spherical mirror, and the above-mentioned "the difference between the angles of the reflecting surface of the first sub-reflecting element 210 and the reflecting surface of the second sub-reflecting element 220 is not greater than 15 °" may mean that the difference between the angles of the planes enclosed by the edges of the reflecting surfaces is not greater than 15 °.

For example, the first sub-reflection element 210 and the second sub-reflection element 220 may be the same type of mirror or different types of mirrors, and the embodiment of the present disclosure schematically illustrates that the first sub-reflection element 210 and the second sub-reflection element 220 are both planar mirrors. The plane reflector is convenient to manufacture the display device, the light path in the display device is folded to save space, and the problems of extra distortion, size change and the like brought to the image displayed by the display device can be avoided.

For example, the second reflective element 300 may be a curved mirror, such as a free-form mirror. When the display device provided by the embodiment of the disclosure is applied to a head-up display, the setting of the curved surface reflector can enable the head-up display to have a longer imaging distance and a larger imaging size, and the curved surface reflector can be matched with a reflective imaging part (mentioned later) of the curved surface, such as a windshield, so as to eliminate virtual image distortion caused by the reflective imaging part.

For example, the image light emitted from at least two display regions 110 includes only the first reflective elements 200 for reflecting the image light of the respective display regions 110 in the light path reflected by the first reflective elements 200 toward the second reflective elements 300. For example, the second sub-reflecting element 220 is not in the light path of the image light emitted from the first display region 111 to the second reflecting element 300, and the first sub-reflecting element 210 is not in the light path of the image light emitted from the second display region 112 to the second reflecting element 300.

For example, as shown in fig. 1, the first display region 111 and the second display region 112 may be located on the same plane, and the optical distances of the image light emitted from at least two display regions to the second reflective element may be different by adjusting the positions and angles of the first sub reflective element 210 and the second sub reflective element 220. For example, the first display area and the second display area may be located on different planes, the first sub-reflecting element and the second sub-reflecting element may be located on the same plane (or different planes), and the optical distances of the image light rays emitted from the at least two display areas to the second reflecting element may be different by adjusting the positions of the first display area and the second display area.

For example, as shown in fig. 1, the image source 100 includes a first sub image source 101, and the first display area 111 and the second display area 112 are both located on the first sub image source 101, that is, the first display area 111 and the second display area 112 may be display areas located at different positions on the same sub image source, that is, the same screen, and perform a partition display, so as to save space and cost. The embodiment of the present disclosure is not limited thereto, and the first display area and the second display area may also be respectively located on different sub-image sources, for example, screens of different sub-image sources may be close to each other; for example, the display surfaces of the different sub-image sources are parallel to each other so that the first display area and the second display area are parallel, and the distance between the different sub-image sources can be set to be larger to prevent the image light rays emitted from the two display areas from influencing each other.

For example, as shown in fig. 1, when the first display area 111 and the second display area 112 are located on the same sub-image source, the light shielding structure 400 is disposed between the first display area 111 and the second display area 112 to prevent image lights emitted from different display areas from affecting each other. For example, the light blocking structure 400 may be a light barrier.

For example, as shown in fig. 1, the first sub-reflecting element 210 and the second sub-reflecting element 220 may be two reflecting elements independent of each other so that both are independently adjusted. For example, fig. 2 shows a display device according to another example of the present embodiment, and as shown in fig. 2, the first sub-reflective element 210 and the second sub-reflective element 220 may also be an integral structure, such as a step mirror, so as to facilitate manufacturing and installation. For example, when the first sub-reflective element and the second sub-reflective element are step mirrors, the connection portion 201 between the two sub-reflective elements hardly affects the propagation of image light emitted from any display region. For example, the base material of the connecting portion 201 may be the same as the material of the sub-reflecting element, such as glass, and a side of the base material of the connecting portion 201 facing the display area may be coated with black flannelette or sprayed with black flannelette paint, dark frosted sand, or the like. The embodiments of the present disclosure are not limited thereto, and the connection portion may be made of a material different from that of the sub-reflective elements, for example, a plastic or metal structural member or the like is used to connect and fix the first sub-reflective element and the second sub-reflective element at both ends.

For example, as shown in fig. 1, the optical distance (a1+ a2) of the image light rays emitted from the first display region 111 to the second reflective element 300 is smaller than the optical distance (B1+ B2) of the image light rays emitted from the second display region 112 to the second reflective element 300, and the virtual image formed by the image light rays emitted from the second display region to the second reflective element by the second reflective element is farther from the user than the virtual image formed by the image light rays emitted from the first display region to the second reflective element by the first reflective element.

For example, as shown in fig. 1, the second display area 112 is located on a side of the first display area 111 away from the second reflective element 300, i.e., the minimum distance between the second display area 112 and the second reflective element 300 is greater than the minimum distance between the first display area 111 and the second reflective element 300. For example, the second sub-reflecting element 220 is located on a side of the first sub-reflecting element 210 away from the second reflecting element 300, i.e., the minimum distance between the second sub-reflecting element 220 and the second reflecting element 300 is greater than the minimum distance between the first sub-reflecting element 210 and the second reflecting element 300. For example, a distance between the center of the second sub-reflection element 220 and the second display region 112 is greater than a distance between the center of the first sub-reflection element 210 and the first display region 111. For example, the geometric distance B1 of the image light emitted from the second display region 112 to the reflective surface of the second sub-reflective element 220 is greater than the geometric distance a1 of the image light emitted from the first display region 111 to the reflective surface of the first sub-reflective element 210, and the geometric distance B2 of the image light reflected from the second sub-reflective element 220 to the reflective surface of the second reflective element 300 is greater than the geometric distance a2 of the image light reflected from the first sub-reflective element 210 to the reflective surface of the second reflective element 300, so that (B1+ B2) > (a1+ a 2).

For example, the first display area 111 may display a close-up view, such as displaying key driving data such as vehicle meters, for example, displaying parameters such as vehicle speed, fuel quantity, or steering; the second display area 112 may display a distant view such as a building or the like. For example, the perspective displayed in the second display area 112 may include a bank, the image of the bank displayed in the image source may include a logo of the bank, and the logo image of the bank may be matched and fused with the position of the real scene of the bank, so that the user may see a building at a distance, for example, a bank, and the logo of the bank is identified in the display.

For example, fig. 3 shows a schematic plan view of the first display area and the second display area. As shown in fig. 3, the area of the first display region 111 is smaller than that of the second display region 112, so that the imaging size of a virtual image formed by the second reflective element 300 reflecting the image light emitted from the first display region 111 is smaller than that of a virtual image formed by the second reflective element 300 reflecting the image light emitted from the second display region 112. For example, the first display area is configured to display a close-up view, and the display content of the close-up view may be a key driving parameter such as a vehicle instrument, so that the size of the displayed close-up view may be smaller; the second display area is configured to display a long-range view, and the display content of the long-range view needs to be matched and fused with a real view outside the vehicle, such as a real view of a building, so that the size of the displayed long-range view is larger than that of the short-range view. For example, a close-up view with a smaller size does not obscure a distant view with a larger size.

For example, fig. 4 is a partial structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure. As shown in fig. 4, the difference from the example shown in fig. 1 is that at least two display regions 110 further include a third display region 113, the first reflective element 200 further includes a third sub-reflective element 230, and the third sub-reflective element 230 is configured to reflect image light emitted from the third display region 113 to the second reflective element 300.

For example, the first display region 111 and the second display region 112 are parallel, and the difference between the angles of the reflective surface of the first sub-reflective element 210 and the reflective surface of the second sub-reflective element 220 is not more than 20 °, and the included angle between the first display region 111 and the third display region 113 is 5 ° to 90 °. Therefore, virtual images formed by the image light rays displayed by the first display area and the second display area after being reflected by the second reflecting element are approximately parallel, the virtual image formed by the image light rays displayed by the third display area after being reflected by the second reflecting element is not parallel to the virtual image formed by the image light rays displayed by the first display area after being reflected by the second reflecting element, and for example, an included angle between the two virtual images can be 5-90 degrees.

For example, the angle between the first display region 111 and the third display region 113 is 10 ° to 80 °. For example, the angle between the first display region 111 and the third display region 113 is 30 ° to 70 °. For example, the angle between the first display region 111 and the third display region 113 is 45 ° to 60 °. The "angle between the first display region 111 and the third display region 113" may refer to an angle between a plane where the first display region is located and a plane where the third display region is located. In the embodiment of the present disclosure, the first display area and the third display area are taken as the planar display areas, but not limited thereto, the first display area and the third display area may also be non-planar display areas, and an included angle between the first display area and the third display area may refer to an included angle between a plane defined by an edge of the first display area and a plane defined by an edge of the third display area.

For example, as shown in fig. 4, taking the third display area 113 as an inclined display area as an example, the inclined third display area 113 has a first end e1 close to the second display area 112 and a second end e2 far away from the second display area 112. For example, in a direction perpendicular to the second display area 112, the first end e1 of the third display area 113 is located at a distance from a plane in which the second display area 112 is located, which is greater than the distance from the second end e 2. For example, the second end e2 of the third display region 113 may be located on the above-mentioned plane, with the first end e1 being closer to the area where the first reflective element 200 is located than the second end e 2.

For example, as shown in fig. 4, when the third display region 113 is an inclined display region, the second end e2 of the third display region 113 is farther from the second reflective element 300 than the first end e1, so that the object distance of the second end e2 is larger. For example, a distance between the first end e1 of the third display region 113 and the third sub reflection element 230 is smaller than a distance between the second end e2 of the third display region 113 and the third sub reflection element 230.

For example, as shown in fig. 4, the geometric distance of the image light emitted from the first display region 111 to the reflection surface of the first sub-reflection element 210 is a1, the geometric distance of the image light reflected from the first sub-reflection element 210 to the reflection surface of the second sub-reflection element 300 is a2, and taking the example that the image light emitted from the first display region 111 propagates in the air (the refractive index n is about 1), the optical distance of the image light emitted from the first display region 111 to the second sub-reflection element 300 is (a1+ a 2). The geometric distance of the image light emitted from the second display region 112 to the reflective surface of the second sub-reflective element 220 is B1, the geometric distance of the image light reflected from the second sub-reflective element 220 to the reflective surface of the second reflective element 300 is B2, and taking the example that the image light emitted from the second display region 112 propagates in the air (refractive index n is about 1), the optical distance of the image light emitted from the second display region 112 to the second reflective element 300 is (B1+ B2). The geometric distance of the image light emitted from the third display region 113 to the reflective surface of the third sub-reflective element 230 is C1, the geometric distance of the image light reflected from the third sub-reflective element 230 to the reflective surface of the second reflective element 300 is C2, and taking the example that the image light emitted from the third display region 113 propagates in the air (refractive index n is about 1), the optical distance of the image light emitted from the third display region 113 to the second reflective element 300 is (C1+ C2). For example, the optical distance of the image light emitted from the third display region 113 to the second reflective element 300 is equal to the optical distance experienced by the main transmission light emitted from the third display region 113 to the third sub-reflective element 230 plus the optical distance experienced by the main transmission light reflected from the third sub-reflective element 230 to the second reflective element 300. For example, the optical distances of the image light rays emitted from the three display regions to the second reflective element 300 satisfy the following relationship: (A1+ A2) ≠ (B1+ B2) ≠ C1+ C2.

In the display device provided by the example, the optical distances of the image light rays emitted from the three display areas to the second reflecting element are different, so that the images can be formed at different distances, and the images at different distances and the live-action scenes at different distances are matched and fused, so that when the display device is applied to a head-up display, a user does not need to switch back and forth between the images at fixed distances and the live-action scenes at different distances, the conflict of convergence adjustment of vision is avoided, and the use experience of the display device is improved. The disclosed embodiment can achieve the purpose of different optical distances of image light rays emitted from the three display areas to the second reflecting element by adjusting the distance between the first sub reflecting element and the first display area and the second reflecting element, the distance between the second sub reflecting element and the second display area and the second reflecting element, and the distance between the third sub reflecting element and the third display area and the second reflecting element.

For example, the first sub-reflection element 210, the second sub-reflection element 220, and the third sub-reflection element 230 may be the same type of mirror or different types of mirrors, and the embodiment of the present disclosure schematically illustrates that the first sub-reflection element 210, the second sub-reflection element 220, and the third sub-reflection element 230 are all planar mirrors.

For example, as shown in fig. 4, image light emitted from at least two display regions 110 includes only the first reflective elements 200 for reflecting the image light of the respective display regions 110 in the light path reflected by the first reflective elements 200 toward the second reflective elements 300. For example, the second sub-reflecting element 220 is not in the optical path of the image light exiting from the first display region 111 to the second reflecting element 300 and the optical path of the image light exiting from the third display region 113 to the second reflecting element 300; the first sub-reflecting element 210 is not in the optical path of the image light emitted from the second display area 112 to the second reflecting element 300 and the optical path of the image light emitted from the third display area 113 to the second reflecting element 300; the third sub-reflecting element 230 is not in the optical path of the image light emitted from the second display region 112 to the second reflecting element 300 and the optical path of the image light emitted from the first display region 111 to the second reflecting element 300.

For example, as shown in fig. 4, the optical distance (a1+ a2) of the image light rays emitted from the first display region 111 to the second reflective element 300 is smaller than the optical distance (C1+ C2) of the image light rays emitted from the third display region 113 to the second reflective element 300, and the optical distance (C1+ C2) of the image light rays emitted from the third display region 113 to the second reflective element 300 is smaller than the optical distance (B1+ B2) of the image light rays emitted from the second display region 112 to the second reflective element 300, so that (B1+ B2) > (C1+ C2) > (a1+ a2), the virtual image of the image light rays emitted from the second reflective element to the third display region is located between two virtual images of the image light rays emitted from the first display region and the second display region.

For example, the first display area 111 may display a close-up view, such as displaying key driving data such as vehicle meters, for example, displaying parameters such as vehicle speed, fuel quantity, or steering; the third display area 113 may display a medium scene picture, for example, the third display area 113 may display a lane picture, for example, when the picture is in an inclined state relative to the ground, the matching and fusion effect with the actual lane is better, so that the user may see that the lane is marked by the image fusion and guide the user to go to the lane; the second display area 112 may display a distant view picture, such as a building, etc., the distant view picture displayed in the second display area 112 is, for example, a bank, the image of the bank displayed by the image source may include a logo of the bank, and the logo image of the bank may be matched and fused with the position of the real view of the bank, so that the user may see the distant building, such as the bank, and the logo of the bank is identified in the display picture.

For example, as shown in fig. 4, the first display region 111 is located on a side of the second display region 112 close to the second reflective element 300, the third display region 113 is located on a side of the second display region 112 far from the second reflective element 300, the third sub-reflective element 230 is located on a side of the second sub-reflective element 220 far from the second reflective element 200, and a distance between a center of the third sub-reflective element 230 and the third display region 113 is smaller than a distance between a center of the first sub-reflective element 210 and the first display region 111.

For example, the first display area 111 and the third display area 113 may be located on different image sources. For example, the image source 100 includes a first sub image source 101 and a second sub image source 102, the first display area 111 and the second display area 112 are located on the first sub image source 101, and the third display area 113 is located on the second sub image source 102, so the angle between the first display area 111 and the third display area 113 may be the angle between the first sub image source 101 and the second sub image source 102. This disclosed embodiment sets up to nonparallel through first sub-image source and second sub-image source, can make the virtual image that the image light that the first display area of second reflection element reflection sent becomes nonparallel with the virtual image that the image light that the second reflection element reflection third display area sent becomes to satisfy the demand that the user watched the image.

For example, the area of the third display region 113 may be larger than the areas of the first and second display regions 111 and 112, so that the imaging size of a virtual image in which the second reflective element 300 reflects the image light rays emitted from the third display region 113 is larger than the imaging size of a virtual image in which the second reflective element 300 reflects the image light rays emitted from the first and second display regions 111 and 112. For example, the middle scene picture displayed in the third display area is inclined, and the inclined picture is arranged, so that the image can be favorably attached to the road surface, and the use effect is improved; meanwhile, because the inclined picture needs to be matched and attached with an actual road surface, the size of the inclined medium-view picture is large, and at least the inclined medium-view picture can cover a half or the whole lane, so that a driver can have a better viewing effect.

For example, fig. 5 is a partial structural schematic diagram of a display device provided according to another example of an embodiment of the present disclosure. As shown in fig. 5, the difference from the example shown in fig. 4 is that the sub-reflective element in the first reflective element 200 adjacent to the second reflective element 300 is a transflective element, not a plane mirror. For example, as shown in fig. 5, the third display region 113 is located on a side of the first display region 111 close to the second reflective element 300, the third sub-reflective element 230 is located on a side of the first sub-reflective element 210 close to the second reflective element 300, and both the first sub-reflective element 210 and the second sub-reflective element 220 are plane mirrors, and the third sub-reflective element 230 is a transflective element and is configured to transmit at least one of the first sub-reflective element 210 and the second sub-reflective element 220 and reflect image light toward the second reflective element 300.

For example, the third sub-reflective element 230 is configured to transmit the image light reflected toward the second reflective element 300 by the first and second sub-reflective elements 210 and 220. That is, the third sub-reflective element 230 is configured to reflect the image light emitted from the third display region 113 to the second reflective element 300, and to transmit the image light reflected toward the second reflective element 300 by the first sub-reflective element 210 and the second sub-reflective element 220; the image light emitted from the second display region 112 is transmitted by the third sub-reflective element 230 during the process of being reflected by the second sub-reflective element 220 to the second reflective element 300; the image light emitted from the first display region 111 is transmitted through the third sub-reflective element 230 while being reflected by the first sub-reflective element 210 to the second sub-reflective element 300.

For example, the reflectivity of the third sub-reflective element 230 for the image light emitted from the third display region 113 may be 30%, 40%, 50%, or other suitable values, and the transmittance for the image light emitted from at least one of the first display region 111 and the second display region 112 may be 70%, 60%, 50%, or other suitable values. For example, the light transmittance of the third sub-reflective element 230 to the image light emitted from the first display region 111 and the second display region 112 may be 70%, 60%, 50%, or other suitable values.

For example, the third sub-reflection element 230 (i.e., a transflective element) includes a polarization transflective element, the third display region 113 emits light of a first polarization, at least one of the first display region 111 and the second display region 112 emits light of a second polarization, the polarization directions of the first polarized light and the second polarized light are perpendicular, and the transflective element is configured to reflect the light of the first polarization and transmit the light of the second polarization. For example, the first display region 111 and the second display region 112 each emit the second polarized light transmitted through the third sub-reflective element 230.

For example, the polarization transflective element may be an element formed by coating or attaching a transparent substrate. For example, the polarization transflective element may be a substrate on which a transflective Film having a property of reflecting the first polarized light and transmitting the second polarized light, such as a Dual Brightness Enhancement Film (DBEF) or a prism Film (BEF), is plated or coated. The disclosed embodiments are not limited thereto, for example, the transflective element may also be an integral element.

For example, the polarization transflective element can be an optical film with polarization transflective function, for example, the polarization transflective element can be formed by combining a plurality of film layers with different refractive indexes according to a certain stacking sequence, and the thickness of each film layer is about 10-1000 nm; the material of the film layer can be selected from inorganic dielectric materials, such as metal oxides and metal nitrides; polymeric materials such as polypropylene, polyvinyl chloride or polyethylene may also be selected.

For example, one of the first polarized light and the second polarized light includes light in the S-polarized state, and the other of the first polarized light and the second polarized light includes light in the P-polarized state. For example, the angle between the polarization directions of the first polarized light and the second polarized light may be substantially 90 °. The embodiments of the present disclosure are not limited thereto, for example, the first polarized light and the second polarized light may also be non-S polarized light or non-P polarized light as long as the polarization directions of the first polarized light and the second polarized light are perpendicular, for example, the first polarized light and the second polarized light may be two kinds of linearly polarized light whose polarization directions are perpendicular to each other, or two kinds of circularly polarized light whose polarization directions are perpendicular to each other, or two kinds of elliptically polarized light whose polarization directions are perpendicular to each other, or the like.

For example, the transflective element is a wavelength transflective element, the wavelength band of the image light emitted from the first display region 111 is a first wavelength band group, the wavelength band of the image light emitted from the second display region 112 is a second wavelength band group, and the transflective element is configured to reflect the image light of the first wavelength band group and transmit the image light of the second wavelength band group.

For example, the image light of the first and second wavelength band groups may include light of red, green and blue (RGB) wavelength bands, and a full width at half maximum of the light of each wavelength band of RGB is not greater than 50 nm. For example, the first band group and the second band group each include image light of three bands, for example, a peak of a first band among the three bands is located in an interval of 410nm to 480nm, a peak of a second band is located in an interval of 500nm to 565nm, and a peak of a third band is located in an interval of 590nm to 690 nm.

For example, the wavelength of the image light of the first wavelength band in the first wavelength band group is different from the wavelength of the image light of the first wavelength band in the second wavelength band group; the wavelength of the image light of the second waveband in the first waveband group is different from that of the image light of the second waveband in the second waveband group; the wavelength of the image light of the third wavelength band in the first wavelength band group is different from the wavelength of the image light of the third wavelength band in the second wavelength band group.

For example, the wavelengths of the image light of each wavelength band in the first wavelength band group are smaller than the wavelengths of the image light of each wavelength band in the second wavelength band group. For example, in the first band group, the wavelength of red light is 620 nm, the wavelength of green light is 500nm, and the wavelength of blue light is 450 nm. For example, in the second band group, the wavelength of red light is 650 nm, the wavelength of green light is 530 nm, and the wavelength of blue light is 470 nm. The embodiments of the present disclosure are not limited thereto, for example, the wavelengths of the image light of each wavelength band in the first wavelength band group are greater than the wavelengths of the image light of each wavelength band in the second wavelength band group. For example, in the first band group, the red light wavelength is 670 nm, the green light wavelength is 550 nm, and the blue light wavelength is 470 nm. For example, in the second band group, the wavelength of red light is 650 nm, the wavelength of green light is 530 nm, and the wavelength of blue light is 450 nm. The arrangement of the wave band relation can facilitate the manufacture of the wavelength transflective element.

For example, the image light of the first and second wavelength band groups may include image light of a plurality of wavelength bands, for example, light of at least three wavelength bands of RGB to form color image light, and the color image light may form a color image. For example, the image light of the first and second wavelength band groups may include image light of one color band, for example, the image light includes one of the light of the three RGB wavelength bands; for another example, the image light includes a wavelength band light of any color in the visible light range to form a monochromatic image light, and the monochromatic image light may form a monochromatic image, similarly to the above implementation process, as long as the wavelengths of the image light of the first wavelength band group and the image light of the second wavelength band group are different.

For example, the third sub-reflective element 230 using the wavelength transflective element may have a reflectivity of 70%, 80%, 90%, 95% or other suitable values for the image light emitted from the third display region 113, and a transmittance of 70%, 80%, 90%, 95% or other suitable values for the image light emitted from the first display region 111 and the second display region 112. Therefore, the utilization rate of the image light rays passing through the third sub-reflecting element can be improved, so that the light energy loss of the image light rays emitted from the first display area, the second display area and the third display area is reduced to the minimum.

For example, the first sub-image source 101 and the second sub-image source 102 are image sources capable of emitting RGB mixed light, such as Light Emitting Diode (LED) displays, Liquid Crystal Displays (LCDs), or the like.

For example, the above-described wavelength transflective element may include a selective transflective film stacked with an inorganic oxide thin film or a polymer thin film, the transflective film being stacked with at least two film layers having different refractive indices. The term "different refractive index" as used herein means that the refractive index of the film layer differs in at least one of the xyz three directions. For example, by selecting desired film layers with different refractive indexes in advance and stacking the film layers in a preset order, a transflective film having selective reflection and selective transmission characteristics can be formed, and the transflective film can selectively reflect light of one characteristic and transmit light of another characteristic. For example, for a film layer using an inorganic oxide 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 example, for a film layer using an organic polymer material, the film layer of the organic polymer material includes at least two thermoplastic organic polymer film layers. For example, two thermoplastic polymer film layers are alternately arranged to form an optical film, and the refractive indices of the two thermoplastic polymer film layers are different. For example, the molecules of the organic polymer material are chain-like structures, and the molecules are arranged in a certain direction after stretching, so that the refractive indexes in different directions are different, that is, a desired film can be formed by a specific stretching process. For example, the thermoplastic polymer may be polyethylene terephthalate (PET) and its derivatives with different degrees of polymerization, polyethylene naphthalate (PEN) and its derivatives with different degrees of polymerization, polybutylene terephthalate (PBT) and its derivatives with different degrees of polymerization, or the like.

For example, fig. 6 is a schematic structural diagram of a head-up display according to an example of another embodiment of the present disclosure. Fig. 6 schematically illustrates an example in which the head-up display includes the display device and the reflective imaging portion 500 shown in fig. 4, and the embodiment of the present disclosure is not limited thereto, and the head-up display may further include the display device and the reflective imaging portion provided in any one of the examples shown in fig. 1 to 2. For example, as shown in fig. 6, the reflective imaging section 500 is located on the light exit side of the second reflective element 300, and is configured to reflect the image light reflected from the second reflective element 300 to the reflective imaging section 500 to the observation area 600 and transmit the ambient light. A user in the observation area 600 can view a plurality of virtual images 1110 and 1130 formed by the image light emitted from the display device by the reflective imaging part 500 and an environmental scene at a side of the reflective imaging part 500 far from the observation area 600.

For example, image light emitted from the display device is incident on the reflective imaging part 500, and light reflected by the reflective imaging part 500 is incident on a user, for example, an observation area 600 where both eyes of a driver are located, so that the user can observe a virtual image formed outside the reflective imaging part, for example, without affecting the observation of the external environment by the user.

For example, the observation area 600 may be an eye box (eyebox) area, which is a planar area where both eyes of the user are located and an image displayed by the head-up display can be seen. For example, when the eyes of the user are deviated from the center of the eye-box region by a certain distance, such as up and down, left and right, the user can still see the image displayed on the head-up display as long as the eyes of the user are still in the eye-box region.

For example, the reflective imaging portion 500 may be a windshield or an imaging window of a motor vehicle, corresponding to a windshield head-up display (W-HUD) and a combined head-up display (C-HUD), respectively.

For example, as shown in fig. 6, image light emitted from the first display region 111 in the first sub-image source 101 is reflected to the second reflecting element 300 by the first sub-reflecting element 210, and the second reflecting element 300 reflects the image light to the reflective imaging part 500 to form a first virtual image 1110; the image light emitted from the second display region 112 in the first sub-image source 101 is reflected to the second reflective element 300 by the second sub-reflective element 220, and the second reflective element 300 reflects the image light to the reflective imaging part 500 to form a second virtual image 1120; the image light emitted from the third display region 113 in the second sub-image source 102 is reflected to the second reflecting element 300 by the third sub-reflecting element 230, and the second reflecting element 300 reflects the image light to the reflective imaging part 500 to form a third virtual image 1130.

For example, the distance between the first virtual image 1110 and the observation area 600 is 2-4 meters, the distance between the second virtual image 1120 and the observation area 600 is 20-50 meters, and the distance between the third virtual image 1130 and the observation area 600 is 7-14 meters. For example, the distance between the first virtual image 1110 and the observation area 600 is 2.5-3.5 meters, the distance between the second virtual image 1120 and the observation area 600 is 30-40 meters, and the distance between the third virtual image 1130 and the observation area 600 is 10-12 meters.

For example, the first virtual image 1110 may be a close-up view, for example, displaying key driving data such as vehicle instruments, for example, displaying parameters such as vehicle speed, oil amount, or steering; for example, the third virtual image 1130 may be a medium view image, for example, the third virtual image may be a lane image, for example, when the image is in an inclined state with respect to the ground, the fusion effect matching with the actual lane is better, so that the user may see that the lane is marked by the image fusion, and guide the user to go around the lane; for example, the second virtual image 1120 may be a distant view picture, such as a building, for example, a bank, and the image of the bank displayed by the second virtual image may include a logo of the bank, and the logo image of the bank may be matched and fused with the position of the real view of the bank, so that the user may see a distant building, such as a bank, and the logo of the bank is identified in the display picture.

For example, the first and second virtual images 1110, 1120 are parallel to the observation region 600. For example, when the head-up display provided by the present embodiment is applied to a transportation device such as a vehicle, the first virtual image 1110 and the second virtual image 1120 may be images perpendicular to the ground to achieve better fusion with a real scene. For example, the first display area 111 and the second display area 112 may be parallel to the ground.

For example, an included angle between the third virtual image 1130 and the first virtual image 1110 is 5 ° to 90 °, and one end of the third virtual image 1130, which is far away from the ground, is farther from the observation area 600 than one end of the third virtual image 1130, which is close to the ground, so as to realize inclination of the picture, so that the fusion effect with actual lane matching is better. For example, the angle between the third virtual image 1130 and the first virtual image 1110 is 10 ° to 80 °. For example, the angle between the third virtual image 1130 and the first virtual image 1110 is 30 ° to 70 °. For example, the angle between the third virtual image 1130 and the first virtual image 1110 is 45 ° to 60 °.

For example, there is an angle between the second sub image source 102 and the first sub image source 101, so that there is also an angle between the third virtual image 1130 formed by the second sub image source 102 and the first virtual image 1110 and the second virtual image 1120 formed by the first sub image source 101.

For example, the third virtual image 1130 is inclined toward the traveling direction of traffic equipment such as vehicles, and the inclined picture is more favorable for matching and attaching the image to the road surface, and for example, the included angle between the third virtual image 1130 and the road surface may be 5 ° to 90 °.

For example, as shown in fig. 6, a virtual image of the second display region 112 reflected by the second reflective element 300 is located at the focal plane of the reflective imaging section 500, or a distance between the virtual image and the reflective imaging section 500 is smaller than a focal length and the virtual image is close to the focal plane of the reflective imaging section 500. In this case, according to the curved-surface imaging rule, the second virtual image 1120 is formed at a longer distance or even at an infinite distance, and is suitable for matching and attaching with a distant real scene.

For example, the head-up display provided by the embodiment of the disclosure may form a plurality of layers of images (e.g., a first virtual image, a second virtual image, and a third virtual image), and the imaging distances of different images are different, and different images may be merged with real scenes at different distances, so that the line of sight of a user (e.g., a driver) does not need to be switched back and forth between an image at a fixed distance and a real scene at a different distance, thereby greatly improving the use experience of the head-up display.

For example, as shown in fig. 6, the head-up display further includes a package body 700 having an opening 710, the image source 100, the first reflective element 200 and the second reflective element 300 are all located in the package body 700, the reflective imaging part 500 is located outside the package body 700, the second reflective element 300 reflects the image light emitted from the image source 100 to the position of the opening 710 of the package body 700 to be emitted from the opening 710 of the package body 700, and the image light emitted from the opening 710 of the package body 700 is reflected to the viewing area 600 by the reflective imaging part 500.

For example, fig. 7 is a schematic structural diagram of a package housing in the head up display shown in fig. 6. As shown in fig. 7, a transparent dust-proof film 720 is provided at the position of the opening 710 of the package case 700 to enclose the opening 710. For example, the transparent dustproof film 720 can prevent dust and impurities from entering the interior of the package housing, but does not affect the image light emitted from the opening 710 to the reflective imaging part 500, and therefore the transparent dustproof film 720 is made of a transparent film. However, in the research, the inventors of the present application also found that the sunlight may generate strong glare on the surface of the transparent dustproof film, and therefore, in an example of the embodiment of the present disclosure, a light shield 730 is disposed outside the transparent dustproof film 720, the light shield 730 does not pass through the optical path of the image light emitted from the opening 710 to the reflective imaging part 500, and the light shield 730 is configured to shield a part of the ambient light 01. For example, the light shield 730 may be formed in the same material and process as the package body 700 in the same step to save process.

For example, as shown in fig. 7, the light shield 730 may be an inclined surface for preventing glare from entering the eyes of the user in the viewing area, so as to further enhance the use experience of the head-up display.

For example, fig. 8 is a schematic structural diagram of a head-up display provided according to another example of another embodiment of the present disclosure. Fig. 8 schematically illustrates an example in which the head-up display includes the display device and the reflective imaging portion 500 shown in fig. 5, and the embodiment of the present disclosure is not limited thereto, and the head-up display may further include the display device and the reflective imaging portion provided in any one of the examples shown in fig. 1 to 2. The difference between the heads-up display in the examples shown in fig. 8 and 6 is that fig. 6 uses the display device shown in fig. 4, and fig. 8 uses the display device shown in fig. 5, so that the heads-up display provided by the present example has the same characteristics as the heads-up display in the example shown in fig. 6, and will not be described again.

For example, as shown in fig. 8, image light emitted from the first display region 111 in the first sub-image source 101 is reflected by the first sub-reflective element 210 and transmitted by the third sub-reflective element 230, and then enters the second reflective element 300, and the second reflective element 300 reflects the image light to the reflective imaging part 500 to form a first virtual image 1110; the image light emitted from the second display region 112 in the first sub-image source 101 is reflected by the second sub-reflective element 220, transmitted by the third sub-reflective element 230, and then enters the second reflective element 300, and the second reflective element 300 reflects the image light to the reflective imaging part 500 to form a second virtual image 1120; the image light emitted from the third display region 113 in the second sub-image source 102 is reflected to the second reflecting element 300 by the third sub-reflecting element 230, and the second reflecting element 300 reflects the image light to the reflective imaging part 500 to form a third virtual image 1130.

For example, the first virtual image, the second virtual image, and the third virtual image in this example have the same characteristics as the first virtual image, the second virtual image, and the third virtual image in the example shown in fig. 6, and are not described again here.

For example, the image source in the embodiment of the present disclosure may include a light source, a backlight assembly, and an image generating section.

For example, the Light source may include at least one electroluminescent device, which generates Light by electric Field excitation, such as a Light Emitting Diode (LED), an Organic Light Emitting Diode (OLED), a Mini LED (Mini LED), a Micro LED (Micro LED), a Cold Cathode FluoreScent LamP (CCFL), a Cold Light source (Cold LED Light, CLL), an Electroluminescence (EL), an electron EmiSSion (FED), a Quantum Dot Light source (QD), or the like.

For example, the image generating section may include a liquid crystal display panel. For example, the liquid crystal display panel may include an array substrate, an opposite substrate, a liquid crystal layer between the array substrate and the opposite substrate, and a sealant encapsulating the liquid crystal layer. For example, the liquid crystal display panel further includes a first polarizing layer disposed on a side of the array substrate away from the opposite substrate and a second polarizing layer disposed on a side of the opposite substrate away from the array substrate. For example, the light source is configured to provide backlight to the liquid crystal display panel, and the backlight is converted into image light after passing through the liquid crystal display panel.

For example, the polarizing axis direction of the first polarizing layer and the polarizing axis direction of the second polarizing layer are perpendicular to each other, but not limited thereto. For example, the first polarizing layer may pass a first linearly polarized light, and the second polarizing layer may pass a second linearly polarized light, but is not limited thereto. For example, the polarization direction of the first linearly polarized light is perpendicular to the polarization direction of the second linearly polarized light.

For example, the backlight assembly may include a reflective light guide element, a light beam converging element, and a light beam diffusing element, and the reflective light guide element, the light beam converging element, and the light beam diffusing element are sequentially disposed between the light source and the image generating part. The light source is arranged in the light emitting direction of the light source, light emitted by the light source is transmitted in the light guide element and emitted to the light beam converging element, and the light emitted by the light beam converging element is incident to the light beam diffusing element.

For example, fig. 9A to 9D are schematic structural diagrams of a reflective light guide element provided according to an embodiment of the present disclosure. Fig. 9A is a schematic cross-sectional view of the reflective light guide element shown in fig. 9B. As shown in fig. 9A and 9B, the reflective light guide element 60 is disposed in the light emitting direction of the light source 10, and light emitted from the light source 10 propagates in the reflective light guide element 60 and then exits to the beam converging element.

For example, as shown in fig. 9A and 9B, the inner surface of the reflective light guide element 60 is provided with a reflective surface, and the large-angle light emitted by the light source 10 (the included angle with respect to the central line of the reflective light guide element 60) is reflected by the reflective surface and then gathered, so as to improve the utilization rate of the light emitted by the light source 10. For example, the reflective light guide element 60 may be a hollow housing provided with a light reflecting surface inside, the housing including an end portion for disposing the light source 10 and a light outlet 60-1 for emitting light. For example, the shape of the case may be a triangular pyramid shape, a quadrangular pyramid shape, or a parabolic shape. For example, the shape of the light outlet 60-1 and the end of the hollow housing may be rectangular, square, trapezoid or parallelogram, and the shape of the light outlet 60-1 and the end may be the same or different.

For example, as shown in fig. 9C, the reflective light guide element 60 may include a solid transparent member having an end 63 where the light source 10 is disposed, and the refractive index of the transparent member is greater than 1, so that a part of the light emitted from the light source 10 is totally reflected on the internal reflection surface of the solid transparent member and then emitted, and another part of the light emitted from the light source 10 is transmitted and emitted in the transparent member. For example, the end 63 of the solid transparent member where the light source 10 is disposed is provided with a cavity 62, and one surface of the cavity 62 close to the light exit surface 60-1 is provided with a collimating part 61 capable of collimating the light emitted from the light source 10. For example, the internal reflective surface of the solid transparent member may be an internal surface of the solid transparent member, and the shape of the internal surface may include a parabolic shape or a freeform surface shape.

For example, as shown in fig. 9D, the reflective light guide element 60 may include a solid transparent member, the end 63 of the solid transparent member where the light source 10 is disposed is provided with a cavity 62, the light emitting surface 60-1 of the solid transparent member is provided with an opening 60-2 extending toward the end 63, and the bottom surface of the opening 60-2 near the end 63 is provided with a collimating part 61 capable of collimating the light emitted from the light source 10.

For example, fig. 10 is a schematic structural diagram of a combination of a light beam converging element and a reflective light guide element provided according to an embodiment of the present disclosure, and fig. 11 is a schematic optical path diagram of a combination of a reflective light guide element, a light beam converging element, and a light beam diffusing element provided according to an embodiment of the present disclosure. As shown in fig. 10, the light beam converging element 70 is configured to perform direction control on the light rays 71 emitted from the reflective light guide element 60, so as to converge the light rays 72 emitted from the light beam converging element 70 to a certain range, for example, an observation range of an image source, so as to further converge the light rays and improve the light utilization rate.

For example, the beam converging element 70 may include a lens or a combination of lenses, such as a convex lens, a fresnel lens or a combination of lenses, etc., which are schematically illustrated in fig. 10 by way of example. For example, the certain range may be a point, such as a focal point of a convex lens, or a region having a small area. The light beam converging element is arranged in the image source, so that large-angle light emitted by the light source can be further converged, and the light utilization rate is improved.

For example, as shown in fig. 11, the light beam diffusing element 80 diffuses the incident light beam 72, and the degree of diffusion of the incident light beam 72 can be precisely controlled, the optical axis OA of the diffused light beam 81 is aligned with the optical axis of the incident light beam 72, that is, the optical axis of the light beam passing through the light beam diffusing element 80 is unchanged, and the marginal ray of the diffused light beam 81 is diffused at a certain angle along the optical axis. The "optical axis" refers to the center line of the light beam.

For example, the spread angle β 1 of the spread light beam 81 in the first direction may be in the range of 5 ° to 20 °, the spread angle β 2 in the second direction may be in the range of 5 ° to 10 °, and the spread angle is an included angle between two maximum viewing axes. For example, when the incident beam 72 passes through the beam diffusion element 80, the cross-sectional spot of the beam along the propagation direction may be rectangular, the first direction is the extending direction of the long side of the rectangle, and the second direction is the extending direction of the short side of the rectangle, the diffusion angle of the first direction is the included angle β 1 between the light rays connected to the two ends of the long side of the rectangular spot, and the diffusion angle of the second direction is the included angle β 2 between the light rays connected to the two ends of the short side of the rectangular spot. For example, when the cross-sectional shape of the light beam along the propagation direction is circular after the light beam passes through the light beam diffusion structure, the diffusion angle is the angle between the edge light ray of the circular cross-section and the optical axis, and the diffusion angles in all directions are the same. The cross-sectional shape of the beam means a cross-section obtained by cutting a ray exiting the beam diffusing element using a plane perpendicular to the center line or main transmission axis of the beam, that is, the cross-section of the beam is perpendicular to the center line of the beam.

For example, the incident beam 72 after passing through the beam-spreading element 80 can be spread into a spot having a specific size and shape along the propagation direction and a uniform energy distribution, and the size and shape of the spot can be precisely controlled by the specific microstructure designed on the surface of the beam-spreading element 80. The particular shapes may include, but are not limited to, linear, circular, elliptical, square, and rectangular. For example, the spread angle and the spot size after the light beam is spread determine the brightness and the visible area of the final image, and the smaller the spread angle is, the higher the imaging brightness is, and the smaller the visible area is; and vice versa.

For example, the light beam diffusing element 80 may be a low-cost scattering optical element, such as a light homogenizing sheet, a diffusing sheet, etc., and the light beam is scattered and slightly diffracted when passing through the scattering optical element, such as the light homogenizing sheet, but the scattering mainly plays a role, and the light beam forms a large light spot after passing through the scattering optical element.

For example, the Beam diffusion element 80 may be a Diffractive Optical Element (DOE) that controls the diffusion effect more precisely, such as a Beam Shaper (Beam Shaper). For example, the diffractive optical element has a specific microstructure designed on the surface, so that light expansion is achieved through diffraction, the light spot is small, and the size and the shape of the light spot are controllable.

For example, after the light emitted from the light source 10 passes through the light beam converging element 70 and the light beam diffusing element 80, the light emitted from the display device is reflected by the reflective imaging part 500 and reaches a first predetermined region, which is a planar observation region, most of the light is collected in the first predetermined region (for example, more than 90% of the light with the light intensity incident on the plane where the first predetermined region is located is collected in the first predetermined region, more than 80% of the light with the light intensity incident on the plane where the first predetermined region is located is collected in the first predetermined region, or more than 60% of the light with the light intensity incident on the plane where the first predetermined region is collected in the first predetermined region), and the light incident on the first predetermined region is distributed over the first predetermined region. In the case where the light beam diffusing element 800 is removed from the optical path of the display device, the light emitted from the display device is reflected by the reflective imaging section 500 and reaches the second predetermined area within the first predetermined area. For example, the second predetermined region may be a region having a small area. For example, the second predetermined area may be a point. For example, the second predetermined region may be a certain range in which the light beam converging element 70 described above converges light. For example, the first predetermined area may include an eye box area, i.e., the observation area 600, and the second predetermined area may be a small area, e.g., a point, e.g., a center, in the observation area 600. Therefore, the light beam diffusion element is arranged in the image source, so that the image light incident to the observation area can be ensured to at least completely cover the observation area, and the normal observation can not be influenced while the high light efficiency is realized.

For example, fig. 12 is a partial schematic structure diagram of a head-up display provided according to another example of another embodiment of the present disclosure. As shown in fig. 12, reflective imaging section 500 includes first layer 20-1, second layer 20-2, and a gap (hereinafter referred to as an interlayer) between first layer 20-1 and second layer 20-2; wedge-shaped film 21 is located in the interlayer (i.e., the gap between first layer 20-1 and second layer 20-2) of reflective imaging section 500. The light incident to the reflective image forming part 500 of the display apparatus 1000 may have an effect of eliminating ghost images due to the provision of the wedge-shaped film in the reflective image forming part 500.

The reflective image forming portion 500 in which the wedge film 21 is provided to the windshield (e.g., front windshield) of the vehicle and the head-up display shown in fig. 12 have the ghost-eliminating function will be exemplarily described. For example, the windshield has a double-glazing structure in which a wedge-shaped polyvinyl butyral (PVB) layer is embedded between two glazings using a special process, and by implementing the reflective imaging section 500 as a windshield provided with the wedge-shaped film 21, images reflected by the inner and outer surfaces of the glass (i.e., an image reflected by the first layer 20-1 and an image reflected by the second layer 20-2) can be superimposed into one image, thereby enabling the head-up display to have a double image suppression (e.g., double image elimination) function.

For example, the wedge film 21 has a thin end and a thick end, and also has a certain angle, and the angle of the wedge film 21 needs to be set according to the requirements of the head-up display. The embodiment of the disclosure can enable the reflection imaging part to be close to the display device and enable the image reflected by the surface far away from the display device to be overlapped into one image by arranging the wedge-shaped film on the reflection imaging part so as to solve the problem of ghost image.

For example, fig. 13 is a partial schematic structural diagram of a head-up display provided according to another example of another embodiment of the present disclosure. As shown in fig. 13, the reflective imaging section 500 is provided with a selective reflection film 501, a P-polarization light reflection film 501, or a first phase retardation section 501 on the surface facing the display device.

For example, the reflective imaging part 500 is provided with a selective reflective film 501 on a surface facing the display device, and the selective reflective film 501 is configured to have a reflectance in a wavelength band in which image light emitted from the display device is present, larger than a reflectance in a wavelength band other than the wavelength band in which image light emitted from the display device is present. For example, the reflectivity of the selective reflection film 501 for the wavelength band of the image light emitted from the display device may be greater than 80%, 90%, 95%, 99.5%, or other suitable values. For example, the reflectance of the selective reflection film 501 may be less than 30%, 20%, 10%, 5%, 1%, 0.5% or other suitable values for light in a wavelength band other than a wavelength band in which image light emitted from the display device is present.

For example, the selective reflection film 501 is configured to reflect image light emitted from the display device and transmit light of a wavelength band other than a wavelength band in which the image light emitted from the display device is located. For example, the selective reflection film 501 only reflects image light emitted from the display device, and if the image light includes light of three wavelength bands of red, green and blue (RGB), the selective reflection film 501 only reflects light of three wavelength bands of RGB and transmits light of other wavelength bands. Therefore, the image light does not generate secondary reflection on the surface of the reflection imaging part far away from the display device, and the ghost image is eliminated.

For example, the selective reflection film 501 may include a selective transflective film in which at least two film layers having different refractive indexes are stacked, and which is formed by stacking an inorganic oxide thin film or a polymer thin film. The term "different refractive index" as used herein means that the refractive index of the film layer differs in at least one of the xyz three directions. For example, by selecting desired film layers with different refractive indexes in advance and stacking the film layers in a preset order, a transflective film having selective reflection and selective transmission characteristics can be formed, and the transflective film can selectively reflect light of one characteristic and transmit light of another characteristic. For example, for a film layer using an inorganic oxide 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 example, for a film layer using an organic polymer material, the film layer of the organic polymer material includes at least two thermoplastic organic polymer film layers. For example, two thermoplastic polymer film layers are alternately arranged to form an optical film, and the refractive indices of the two thermoplastic polymer film layers are different. For example, the molecules of the organic polymer material are chain-like structures, and the molecules are arranged in a certain direction after stretching, so that the refractive indexes in different directions are different, that is, a desired film can be formed by a specific stretching process. For example, the thermoplastic polymer may be polyethylene terephthalate (PET) and its derivatives with different degrees of polymerization, polyethylene naphthalate (PEN) and its derivatives with different degrees of polymerization, polybutylene terephthalate (PBT) and its derivatives with different degrees of polymerization, or the like.

For example, the image light emitted from the display device may include light in a P-polarization state, the surface of the reflective imaging part 500 facing the display device is provided with a P-polarization light reflection film 501 to reflect the light in the P-polarization state (i.e., P-polarization light) emitted from the display device to the reflective imaging part 500, and the reflectivity of the P-polarization light reflection film 501 to the light in the P-polarization state is greater than the reflectivity to the light in the S-polarization state.

For example, the surface of the reflective imaging section 500 may be provided with the P-polarization light reflection film 501 so that the image light in the P-polarization state is reflected by the P-polarization light reflection film 501 and enters the observation area 600. For example, when the reflective imaging section 500 is made of glass, the glass has a high transmittance and a low reflectance for P-polarized light, and therefore, in addition to the P-polarized light reflected by the P-polarized light reflecting film 501, the P-polarized light transmitted through the glass has a low luminance reflected by the outer surface of the reflective imaging section 500 toward the observation area 600, and thus ghost images can be eliminated.

For example, the P-polarization light reflection film may be formed by stacking a plurality of films, which are similar to the selective reflection film, and may be formed by stacking an organic film or an inorganic film. For example, the P-polarized light Reflecting film may be a Reflective Polarizer Mirror (RPM), i.e., an RPM film.

For example, the surface of the reflective imaging part 500 facing the display device is provided with a first phase retardation part 501, the light emitted by the display device includes S-polarized light (i.e., S-polarized light), and the first phase retardation part 501 is configured to convert the S-polarized light entering the first phase retardation part 501 into non-S-polarized light, such as P-polarized light, circularly polarized light, or elliptically polarized light.

For example, the image light emitted from the display device includes S-polarized light, the first phase retardation part 501 may be an 1/2 wave plate, a part of the S-polarized light incident on the first phase retardation part 501 may be reflected by the reflective imaging part 500 to the observation area 600, and another part of the S-polarized light passes through the first phase retardation part 501 and is converted into P-polarized light, and the reflectivity of the P-polarized light on the inner surface of the reflective imaging part 500 is low, and the P-polarized light is substantially transmitted, so as to eliminate the ghost image.

For example, the image light emitted from the display device includes S-polarized light, the first phase retardation part 501 may be an 1/4 wave plate, a part of the S-polarized light incident on the first phase retardation part 501 may be reflected by the reflective imaging part 500 to the observation area 600, and another part of the S-polarized light passes through the first phase retardation part 501 and is converted into circularly polarized light, and the reflectivity of the circularly polarized light on the inner surface of the reflective imaging part 500 is low, so that the ghost image can be eliminated.

For the sake of convenience, a gap is formed between the first phase delay unit 501 and the reflective imaging unit 500, but in practical application, the surface of the first phase delay unit 501 is tightly attached to the surface of the reflective imaging unit 500; the reflective imaging section 500 is also enlarged in fig. 13. For example, the thickness of the reflective imaging section 500 is enlarged.

In the head-up display provided by the embodiment of the disclosure, a double image can be effectively eliminated by arranging the wedge-shaped film, the selective reflection film, the P-polarization light reflection film or the first phase delay part in the reflective imaging part.

For example, the reflectance of the reflective imaging part, such as a windshield of a motor vehicle, with respect to the S-polarized light (S-polarized light) is high, so the light emitted from the display device of the head-up display generally includes S-polarized light, and in this case, if a user, such as a driver, wears sunglasses, the sunglasses filter the S-polarized light, so that the driver cannot see the image of the head-up display when wearing the sunglasses. In an example of the embodiment of the present disclosure, when the reflective imaging portion 500 in the head-up display is provided with a P-polarized light reflective film on a side facing the display device, and the image light emitted by the display device includes light in a P-polarized state, the reflective imaging portion 500 may reflect the image light in the P-polarized state to the observation area 600 so that a user wearing sunglasses with two eyes in the observation area 600 can still see an image displayed by the display device, thereby improving the user experience.

For example, fig. 14 is a partial schematic structural diagram of a head-up display provided according to another example of another embodiment of the present disclosure. As shown in fig. 14, a second phase retardation portion 502, for example, a quarter-wave plate, is provided between the display device of the head-up display and the reflective imaging portion 500. The second phase retardation portion 502 is not disposed on the reflective imaging portion 500 of the head-up display in a close contact manner, that is, a certain distance is provided between the second phase retardation portion 502 and the reflective imaging portion 500, so that the light emitted from the display device passes through the second phase retardation portion 502, is reflected by the reflective imaging portion 500, does not pass through the second phase retardation portion 502 again, and is directly emitted to the observation area 600. For example, the light emitted from the display device includes S-polarized light, the second phase retardation unit 502 is configured to convert the S-polarized light entering the second phase retardation unit 502 into circularly polarized light (circularly polarized light) or elliptically polarized light (elliptically polarized light), the circularly polarized light or elliptically polarized light is reflected by the reflective imaging unit 500 and emitted to the observation area 600, and the P-polarized light enables a user wearing a pair of glasses in the observation area 600 to still view an image displayed by the display device after being filtered by the sunglasses because the circularly polarized light or elliptically polarized light includes P-polarized light, thereby improving the user experience.

For example, the second phase delay portion 502 may be disposed at the position of the opening 710 of the package case 700.

For example, fig. 15 is an exemplary block diagram of a transportation device provided in accordance with another embodiment of the present disclosure. As shown in fig. 15, the transportation device includes a head-up display provided by at least one embodiment of the present disclosure. The front window (e.g., front windshield) of the traffic device is multiplexed as the reflective imaging portion 500 of the heads-up display. For example, when the head-up display is applied to a transportation device, the first virtual image 1110 and the second virtual image 1120 shown in fig. 6, 8, 13, or 14 are perpendicular to the ground, and the end of the third virtual image 1130 away from the ground is farther from the observation area 600 than the end of the third virtual image 1130 close to the ground so that each virtual image is matched and fused with a corresponding real scene.

The traffic equipment that this disclosed embodiment provided uses above-mentioned new line display, can make the driver watch the image in different distance departments, is favorable to the image of different distances and the outdoor scene of different distances to match the fusion to make the driver need not to make a round trip to switch between the image of fixed distance and the outdoor scene of different distances, avoided the vision vergence to adjust the conflict, improved traffic equipment's use and experienced.

For example, the vehicle may be any suitable vehicle, such as a land vehicle including various types of automobiles, or a water vehicle such as a boat, as long as a front window is provided at a driving position thereof and an image is projected onto the front window through an in-vehicle display system.

It is noted that in the drawings used to describe embodiments of the present disclosure, the thickness of layers or regions are exaggerated or reduced for clarity, i.e., the drawings are not drawn to scale.

Although the present disclosure has been described in detail hereinabove with respect to general illustrations and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the embodiments of the disclosure. Accordingly, such modifications and improvements are intended to be within the scope of this disclosure, as claimed.

The following points need to be explained:

(1) in the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the same embodiment of the disclosure and of different embodiments may be combined with each other without conflict.

The above description is intended to be exemplary of the present disclosure, and not to limit the scope of the present disclosure, which is defined by the claims appended hereto.

Claims (25)

1. A multilayer image display device characterized by comprising:

an image source comprising at least two display areas, the at least two display areas comprising a first display area and a second display area;

the first reflecting element is positioned on the display side of the image source and is configured to reflect the image light rays emitted by the at least two display areas;

a second reflective element located on a side of the first reflective element facing the image source and configured to reflect the image light reflected from the first reflective element toward the second reflective element,

the first reflecting element comprises a first sub reflecting element and a second sub reflecting element, the first sub reflecting element is configured to reflect the image light rays emitted by the first display area to the second reflecting element, the second sub reflecting element is configured to reflect the image light rays emitted by the second display area to the second reflecting element, and the optical distances of the image light rays emitted from the at least two display areas to the second reflecting element are different.

2. The multilayer image display device of claim 1, wherein an optical distance of the image light rays exiting the first display region to the second reflective element is smaller than an optical distance of the image light rays exiting the second display region to the second reflective element.

3. A multilayer image display device according to claim 2, wherein the second display region is located on a side of the first display region remote from the second reflective element, the second sub reflective element is located on a side of the first sub reflective element remote from the second reflective element, and a distance between a center of the second sub reflective element and the second display region is larger than a distance between a center of the first sub reflective element and the first display region.

4. A multilayer image display device according to claim 2, wherein the first display region and the second display region are parallel, and an angular difference between the reflection surface of the first sub-reflection element and the reflection surface of the second sub-reflection element is not more than 20 °.

5. The multi-layered image display apparatus according to claim 4, wherein the image source comprises a first sub-image source, the first display region and the second display region are both located on the first sub-image source, and a light shielding structure is disposed between the first display region and the second display region.

6. A multilayer image display device according to claim 2, wherein the area of the first display region is smaller than the area of the second display region.

7. A multi-layered image display apparatus according to claim 2, wherein the first sub-reflecting element and the second sub-reflecting element are of a unitary structure.

8. A multi-layered image display device as claimed in any one of claims 2 to 7, wherein the at least two display regions further comprise a third display region, the first reflective element further comprises a third sub-reflective element, the third sub-reflective element is configured to reflect the image light emitted from the third display region to the second reflective element, and the angle between the first display region and the third display region is in the range of 5 ° to 90 °.

9. The device of claim 8, wherein an optical distance of the image light rays emitted from the first display region to the second reflective element is smaller than an optical distance of the image light rays emitted from the third display region to the second reflective element, and wherein an optical distance of the image light rays emitted from the third display region to the second reflective element is smaller than an optical distance of the image light rays emitted from the second display region to the second reflective element.

10. A multilayer image display device according to claim 9, wherein the third display region is located on a side of the second display region remote from the second reflective element, the third sub-reflective element is located on a side of the second sub-reflective element remote from the second reflective element, and a distance between a center of the third sub-reflective element and the third display region is smaller than a distance between a center of the first sub-reflective element and the first display region.

11. A multilayer image display device according to claim 10, wherein the first sub-reflecting element, the second sub-reflecting element and the third sub-reflecting element are each a plane mirror.

12. The multilayer image display device according to claim 9, wherein the third display region is located on a side of the first display region close to the second reflective element, the third sub-reflective element is located on a side of the first sub-reflective element close to the second reflective element, and the first sub-reflective element and the second sub-reflective element are both plane mirrors, and the third sub-reflective element is a transflective element and is configured to transmit at least one of the first sub-reflective element and the second sub-reflective element and reflect the image light toward the second reflective element.

13. A multi-layered image display apparatus according to claim 12, wherein the transflective element comprises a polarizing transflective element, the third display region emits light of a first polarization, at least one of the first display region and the second display region emits light of a second polarization, the polarization directions of the first polarized light and the second polarized light being perpendicular, the transflective element being configured to reflect the light of the first polarization and to transmit the light of the second polarization.

14. The multi-layered image display apparatus of claim 12, wherein the transflective element is a wavelength transflective element, the third display region emits the image light in a first wavelength band, at least one of the first display region and the second display region emits the image light in a second wavelength band, and the transflective element is configured to reflect the image light of the first wavelength band and transmit the image light of the second wavelength band.

15. The multi-layered image display apparatus of claim 8, wherein the image source further comprises a second sub-image source, the third display region being located on the second sub-image source.

16. A head-up display comprising the multilayer image display device according to any one of claims 2 to 7 and a reflective image forming section,

the reflection imaging part is positioned on the light emitting side of the second reflection element, and is configured to reflect the image light reflected to the reflection imaging part from the second reflection element to an observation area and transmit ambient light.

17. The head-up display of claim 16, wherein the distance between the first virtual image formed by the image light emitted from the first display region reflected by the reflective imaging part and the observation region is 2-4 m, and the distance between the second virtual image formed by the image light emitted from the second display region reflected by the reflective imaging part and the observation region is 20-50 m.

18. The head-up display of claim 17, wherein the at least two display regions further comprise a third display region, the first reflective element further comprises a third sub-reflective element, the third sub-reflective element is configured to reflect the image light emitted from the third display region to the second reflective element, and an included angle between the first display region and the third display region is 5 ° to 90 °; the optical distance of the image light rays emitted from the first display area to the second reflecting element is smaller than the optical distance of the image light rays emitted from the third display area to the second reflecting element, and the optical distance of the image light rays emitted from the third display area to the second reflecting element is smaller than the optical distance of the image light rays emitted from the second display area to the second reflecting element.

19. The head-up display of claim 18, wherein a distance between a third virtual image formed by the image light rays emitted by the third display region and reflected by the reflective imaging section and the observation region is 7-14 m, the first virtual image and the second virtual image are parallel, and an included angle between the third virtual image and the first virtual image is 5-90 °.

20. The heads-up display of claim 19 wherein the first and second virtual images are perpendicular to the ground, and wherein an end of the third virtual image distal from the ground is further from the viewing zone than an end of the third virtual image proximal to the ground.

21. The head-up display of any one of claims 17 to 20, wherein a virtual image of the second display region reflected by the second reflective element is located at a focal plane of the reflective imaging section.

22. The head-up display of any one of claims 17-20, further comprising an enclosure having an opening, wherein the image source, the first reflective element, and the second reflective element are all located within the enclosure, the reflective imaging section is located outside the enclosure, and image light exiting the opening of the enclosure is reflected by the reflective imaging section to the viewing area.

23. The head-up display of claim 22, wherein a transparent dustproof film is disposed at the opening to enclose the opening, a light shield is disposed outside the transparent dustproof film, the light shield does not pass through an optical path of the image light exiting from the opening to the reflective imaging section, and the light shield is configured to shield a portion of ambient light.

24. A transportation device comprising the heads-up display of any of claims 17-23.

25. The transportation apparatus of claim 24 wherein the reflective imaging portion is a windshield of the transportation apparatus.

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