CN111948818A

CN111948818A - Head-up display device and motor vehicle

Info

Publication number: CN111948818A
Application number: CN202010408997.XA
Authority: CN
Inventors: 吴慧军; 徐俊峰; 方涛
Original assignee: Future Beijing Black Technology Co ltd
Current assignee: Future Beijing Black Technology Co ltd
Priority date: 2019-05-17
Filing date: 2020-05-14
Publication date: 2020-11-17
Also published as: CN111948810A; CN212989778U; CN212989777U; CN111948811A; CN111948817A; CN213092010U; CN212255879U

Abstract

The invention provides a head-up display device and a motor vehicle, wherein the head-up display device comprises a light source, a first light gathering element, a light diffusion element, a liquid crystal panel and a second light gathering element; the light guide element comprises a light-emitting surface facing the first light gathering element, and the light is transmitted inside the light guide element and emitted to the first light gathering element from the light-emitting surface; the first light gathering element gathers the light and transmits the light to the liquid crystal panel; the liquid crystal panel converts the light into image light; the second light gathering element gathers the image light and reflects the image light to the first preset area; the light diffusion element diffuses the light gathered to the first preset area to the second preset area; the light guide element, the first light gathering element and the liquid crystal panel are sequentially arranged between the light source and the second light gathering element, and the head-up display device can improve the image brightness and reduce the power consumption.

Description

Head-up display device and motor vehicle

Technical Field

The invention belongs to the technical field of optical display, and particularly relates to a head-up display device and a motor vehicle comprising the same.

Background

HUD (head up display) is through the optical design of reflective, on the light that sends the image source finally projects imaging window (imaging plate, windshield etc.), the driver need not to bow just can directly see the picture, avoids the driver to bow and sees the distraction that the panel board leads to in driving process, improves and drives factor of safety, also can bring better driving experience simultaneously. Specifically, to take HUD based on plane mirror and the reflection of curved surface speculum formation of image as the example, the light that HUD looks like the source and sends is emergent after plane mirror, the reflection of curved surface mirror in proper order, and the light of outgoing can take place to reflect and remain in one side of cockpit on transparent formation of image window, gets into driver's eyes. These light rays entering the eyes of the driver make it possible for the driver to see a virtual image of the picture displayed on the HUD image source, which appears in space on the other side of the imaging window. Meanwhile, because the imaging window itself is transparent, the ambient light on the other side of the imaging window can still transmit the image to the eyes of the driver through the imaging window, so that the driver can see the HUD imaging and can not influence the road condition of the driver during driving to observe the road condition outside the vehicle.

Most of the image sources of the conventional HUD are Liquid Crystal Displays (LCDs). If the HUD adopts traditional LCD image source, the HUD shows the luminance of formation of image through on the imaging window is lower, generally guarantees the HUD through the luminance that improves LCD image source and shows the luminance of formation of image on the imaging window. But current image source generally only sets up simple condensing equipment on backlight source's light-emitting direction if reflection of light cup, only rely on reflection of light cup to control the light that the light source sent, but reflection of light cup is relatively poor to the control effect of light, the exit angle of part light is great, thereby lead to the unable driver's that reachs of part light, and can not effectively utilized, the light utilization ratio that leads to current HUD device is low, whole light efficiency is lower, picture luminance is not enough, and the luminance that will obtain sufficient picture will produce higher electric power consumption, these have all restricted HUD's further popularization and application.

Disclosure of Invention

In order to overcome the problem of low light utilization rate of the head-up display device in the prior art, the invention provides a head-up display device, which comprises: the light source, the light guide element, the first light gathering element, the light diffusion element, the liquid crystal panel and the second light gathering element; the light source emits light rays; the light guide element comprises a light-emitting surface facing the first light ray gathering element, and light is transmitted through the inside of the light guide element and emitted from the light-emitting surface to the first light ray gathering element; the first light gathering element gathers light and transmits the light to the liquid crystal panel; the liquid crystal panel converts light rays into image light rays; the second light gathering element gathers the image light and reflects the image light to a first preset area; the light diffusion element diffuses the light gathered to the first preset area to a second preset area; the light guide element, the first light gathering element and the liquid crystal panel are sequentially arranged between the light source and the second light gathering element.

According to some embodiments of the invention there is provided a head-up display device further comprising: a transflective element; the transflective element is arranged between the second light gathering element and the first predetermined region; the image light rays collected and reflected by the second light ray collecting element are reflected to the first preset area through the transflective element.

According to some embodiments of the present invention, there is provided a head-up display device, wherein the light diffusing element is disposed between the first light condensing element and the liquid crystal panel.

According to the head-up display device provided by some embodiments of the invention, the light diffusing element is attached to a side of the liquid crystal panel close to the second light collecting element.

According to some embodiments of the invention there is provided a head-up display device further comprising: a reflective element; the reflecting element is arranged between the second light gathering element and the transflective element; or the reflecting element is arranged between the liquid crystal panel and the second light gathering element.

According to some embodiments of the present invention there is provided a head-up display device, the light guiding element comprising a solid transparent member; the solid transparent member includes an end portion where the light source is disposed, and a refractive index of the solid transparent member is greater than 1; the first light emitted by the light source is totally reflected on the internal reflection surface of the solid transparent component, transmitted to the light-emitting surface and emitted to the first light gathering element; the second light emitted by the light source is transmitted to the light-emitting surface in the solid transparent component and is emitted to the first light gathering element.

According to some embodiments of the invention there is provided a head-up display device further comprising: a collimating element; the collimating element is arranged between the light source and the first light gathering element, and the collimating element adjusts the light emitted by the light source into parallel light.

According to the head-up display device provided by some embodiments of the present invention, the collimating element is attached to and disposed outside the light emitting surface of the solid transparent member.

According to the head-up display device provided by some embodiments of the present invention, a cavity is disposed at an end of the solid transparent member where the light source is disposed, and the collimating element is disposed at a side of the cavity close to the light exit surface.

According to the head-up display device provided by some embodiments of the present invention, a cavity is disposed at an end of the solid transparent member where the light source is disposed, an opening extending toward the end is disposed at a light emitting surface of the solid transparent member, and the collimating element is disposed at a bottom surface of the opening close to the end.

According to some embodiments of the present invention, there is provided a head-up display device, wherein the first light gathering element includes at least one of a convex lens, a concave lens, a fresnel lens, or a combination thereof.

According to some embodiments of the present invention, there is provided a head-up display device, wherein the second light collecting element comprises at least one curved mirror; and the image light is gathered and reflected on the concave surface of the curved surface reflector.

According to some embodiments of the invention there is provided a head-up display device, the reflective element comprising at least one planar mirror.

According to some embodiments of the present invention there is provided a head-up display device, the light diffusing element comprising at least one of a diffractive optical element and a scattering optical element.

The embodiment of the invention also provides a motor vehicle which comprises any one of the head-up display devices.

In the above scheme provided by the embodiment of the present invention, the light emitted from the light source 100 is collected in the first predetermined area a1 by the light guide element 200, the first light collecting element 300, the second light collecting element 600, and the like, so that the light is concentrated in the observation area as much as possible, thereby improving the utilization rate of the light and the brightness of the picture; meanwhile, the light diffusion element 400 is arranged to diffuse the light collected in the smaller area to the larger area, so that an observer such as a driver or a passenger with both eyes in the second predetermined area a2 can observe the image of the heads-up display device within a certain range, and the light beam can be prevented from reaching an unnecessary position to increase the brightness of the image and/or reduce the power consumption of the light source.

The embodiment of the present disclosure further provides a motor vehicle, including any of the above-mentioned head-up display devices, so that a driver can directly see more abundant information, such as a navigation map, complex safety information, etc., without looking down at an instrument panel during driving, and because the first light collecting element 300, the second light collecting element 600 and the light diffusing element 400 are arranged in the head-up display device, the display device has low power consumption, and the display of the second predetermined area a2 has high brightness, so that the requirement of the driver for controlling various information during vehicle driving can be better satisfied.

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

Drawings

FIG. 1 is a first schematic diagram illustrating a head-up display device according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a second embodiment of a head-up display device;

FIG. 3 is a schematic diagram showing a third exemplary embodiment of a head-up display device;

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

FIG. 5 is a schematic diagram of a first light concentrating element in a head-up display device according to an embodiment of the invention;

FIG. 6 is a first diagram illustrating a light diffusing element in a head-up display device according to an embodiment of the present invention;

FIG. 7 is a second schematic diagram of a light diffusing element in a head-up display device according to an embodiment of the invention;

FIG. 8 shows a first schematic diagram of a head-up display device having a collimating element according to an embodiment of the present invention;

FIG. 9 is a second schematic diagram of a head-up display device having a collimating element according to an embodiment of the present invention;

FIG. 10 is a third schematic diagram of a head-up display device having a collimating element according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a liquid crystal panel in a head-up display device according to an embodiment of the invention.

Description of reference numerals: 100-a light source; 200-a light guiding element; 300-a first light concentrating element; 400-a light diffusing element; 500-a liquid crystal panel; 600-a second light concentrating element; 700-a transflective element; 800-a reflective element; 900-a collimating element; 201-solid transparent member; 2001-light-emitting surface; 2011-solid transparent member tip; 2012-solid transparent member cavity; 2013-solid transparent member opening.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying drawings.

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

It should be noted that for simplicity and clarity of illustration, the following describes several representative embodiments of the present invention. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". "first," "second," and the like are used merely as references to features and are not intended to limit the features in any way, such as in any order. In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.

Referring to fig. 1, fig. 1 is a schematic view of a head-up display device according to an embodiment of the present invention, which includes a light source 100, a light guide element 200, a first light collecting element 300, a light diffusing element 400, a liquid crystal panel 500, and a second light collecting element 600. As shown in fig. 1, the light source emits light, the light guide element 200 includes a light emitting surface 2001, the light emitting surface 2001 faces the first light collecting element 300, and the light is transmitted through the light guide element 200 and emitted from the light emitting surface 2001 to the first light collecting element 300; the first light condensing element 300 condenses the light and transmits the light to the liquid crystal panel 500, and the liquid crystal panel 500 converts the light into image light; the second light condensing element 600 condenses the image light and reflects the image light to the first predetermined area a 1; the light diffusing element 400 diffuses the light collected to the first predetermined area a1 to the second predetermined area a2, and the light guiding element 200, the first light collecting element 300 and the liquid crystal panel 500 are sequentially disposed between the light source 100 and the second light collecting element 600.

In this embodiment, the light source 100 emits light, the light source 100 may be a point light source, a line light source or a surface light source, and the number of the light sources 100 may be one or more, which is not limited; the Light source 100 includes at least one electroluminescent element, which generates Light by electric Field excitation, including but not limited to Light Emitting Diodes (LEDs), Organic Light Emitting Diodes (OLEDs), Mini Light Emitting diodes (Mini LEDs), Micro LEDs (Micro LEDs), Cold Cathode Fluorescent Lamps (CCFLs), Cold Light sources (Cold LEDs Light, CLL), Electro Luminescence (EL), electron Emission (FED), or Quantum Dot Light Sources (QDs).

As shown in fig. 1, the light guide element 200 includes a light exit surface 2001, the light exit surface 2001 faces the first light collecting element 300, and the light is transmitted through the light guide element 200 and exits from the light exit surface 2001 to the first light collecting element 300. The light emitted from the light source 100 generally has a certain divergence angle, for example, the light emitted from the LED has a divergence angle of 60 °, 90 ° or 120 °, and the light having a larger divergence angle is difficult to be imaged by the liquid crystal panel 500. Therefore, the light emitted from the light source 100 with a certain divergence angle, for example, 60 ° divergent light, is emitted to the light guide element, the light guide element 200 gathers the light emitted from the light source 100 with a large divergence angle, and the gathered light is emitted to the first light gathering element 300. It is understood that the light transmitted through the light guide element may be light directly emitted from the light source 100, as shown in fig. 1; the light emitted from the light source 100 may also be light emitted indirectly, that is, the light emitted from the light source 100 passes through other elements and reaches the light guide element 200, which is not limited in this embodiment. By arranging the light guide element 300, the light rays with a certain divergence angle emitted by the light source 100 can be gathered, so that as much light rays as possible are utilized for imaging, and the light utilization rate is improved.

As shown in fig. 1, the first light converging element 300 converges the light, and the light emitted from the light emitting surface 2001 is converged after passing through the first light converging element 300, so that more light can finally reach the first predetermined area a1, thereby improving the utilization rate of the light. The first light collection element 300 is particularly adapted to converge the plurality of light rays by changing the optical axis of the light beam, so that the propagation direction of the light rays can be controlled, and more light rays can finally reach the first predetermined area a 1. For example, the first light concentrating element 300 includes an optical element that can focus light such that a plurality of light rays can be focused to a point or a small area, but is not limited thereto.

As shown in fig. 1, the liquid crystal panel 500 converts light into image light and emits the image light. It will be understood by those skilled in the art that the light passing through the liquid crystal panel 500 is converted into image light including image information. Since the liquid crystal panel 500 does not change the main optical axis direction of the light beam, the propagation direction of the light beam after passing through the liquid crystal panel 500 is unchanged.

As shown in fig. 1, the image light is emitted to the second light collecting element 600, and the second light collecting element 600 collects the image light and reflects the image light to the first predetermined area a 1. Optionally, the second light collecting element 600 includes at least one curved reflector, as illustrated in fig. 1 by taking the curved reflector as an example; further, when the second light collecting element 600 is a curved mirror, the image light is collected and reflected by a concave surface of the curved mirror. The curved reflector is arranged to further collect the light rays, so that the light rays are finally collected into the first predetermined area A1 as much as possible, and the utilization rate of the light rays is improved.

As shown in fig. 1, the light diffusing element 400 diffuses the light condensed to the first predetermined area a1 to the second predetermined area a2, and the light diffusing element 400 diffuses the light passing through the light diffusing element 400 without changing the optical axis. The optical axes of the light rays are indicated by broken lines in fig. 1, and it can be seen that the light passing through the light diffusing element 400 is diffused along the optical axis thereof, and the diffused light rays are finally collected at the second predetermined area a 2. Specifically, the light diffusing element 400 diffuses the light condensed by the first light condensing element 300 so that the range of the observation region can be expanded; the light rays in the light beam passing through the light diffusing element 400 are dispersed to the outside four, but the optical axis of the light beam, that is, the propagation direction is not changed. For example, the area of the cross section of the light beam incident to the light diffusion element 400 is smaller than the cross section of the light beam after passing through the light diffusion element 400. For example, in embodiments of the present disclosure, the "optical axis" refers to the center line of the light beam, and may refer to the main propagation direction of the light. Alternatively, in the head-up display device of the embodiment, only the light diffusing element 400 is removed, and the light source 100, the light guiding element 200, the first light converging element 300, the liquid crystal panel 500, the second light converging element 600, and the like are remained, the light emitted from the light source 100 is finally converged into the first predetermined area a1, which is indicated by a dotted line in fig. 1. With the light diffusing element 400, the light is diffused along the optical axis, so that the diffused light is finally collected in the second predetermined area a2, and the area of the second predetermined area a2 is larger than that of the first predetermined area a 1.

If the light diffusing member 400 is not provided, the light emitted from the light source 100 may be finally collected and fall into the first predetermined area a 1. In this case, although light is efficiently used, an image can be observed only in a small area, i.e., the first predetermined area a 1. The light diffusion element 400 can accurately diffuse light, and the diffused light can cover the second predetermined area a2, so that normal observation is not affected while high luminous efficiency is achieved. That is, under the combined action of the light guiding element 200, the first light concentrating element 300, the second light concentrating element 600, and the like, which concentrate the light beams and the light diffusing element 400 diffuses the light beams, the light beams can be distributed in the second predetermined area a2, so that the light utilization rate can be improved and the light efficiency can be improved. As shown in fig. 1, the dotted line in fig. 1 represents the optical axis of the light ray when the light diffusion element 400 is not disposed, and may also be considered as the original propagation direction of the light ray when the light diffusion element 400 is not disposed, and it can be seen that the light ray is converged in the first predetermined area a1, and after the light diffusion element 400 is disposed, the light ray covers the second predetermined area a 2. It is understood that the diffused light beam may be larger than the second predetermined area a2 as long as the second predetermined area a2 is completely covered. For example, when the light diffusion member 400 is disposed, the diffused light beam just covers the second predetermined area a2, and the light efficiency of the head-up display device is the highest.

As shown in fig. 1, the light guide element 200, the first light collecting element 300 and the liquid crystal panel 500 are sequentially disposed between the light source 100 and the second light collecting element 600. The light source 100 emits light, after the light passes through the light guide element 200, the light with a large divergence angle is gathered, and the light is transmitted to the first light gathering element 300; the light is further condensed by the first light controlling element 300, the condensed light is transmitted to the liquid crystal panel 500, the liquid crystal panel 500 converts the light into image light, and the second light condensing element 600 condenses and reflects the image light to the first predetermined area a 1. Optionally, in some embodiments, for example, the first light collecting element 300 is attached to the light diffusing element 400, and the light diffusing element 400 is attached to the liquid crystal panel 500, but not limited thereto; in other embodiments, the first light collecting element 300, the light diffusing element 400 and the liquid crystal panel 500 may be attached or integrally formed.

Specifically, the "first predetermined region" refers to a plane observation region, and after light emitted from the light source 100 passes through the series of elements except the light diffusion element 400, the light reaches a plane where the first predetermined region is located, most of the light except stray light is collected in the first predetermined region a1, and the light collected in the first predetermined region a1 is distributed over the second predetermined region a2, the optical axes of the collected light are substantially all collected in the first predetermined region a1, and light at other angles (such as stray light) may not be collected in the first predetermined region a 1; the "second predetermined region" refers to a plane where light emitted from the light source 100 reaches the second predetermined region after passing through all the optical elements, most of the light is collected in the second predetermined region a2 (for example, more than 90% of light with light intensity in a light beam incident on the plane where the second predetermined region a2 is collected in the second predetermined region a2, more than 80% of light with light intensity in a light beam incident on the plane where the second predetermined region a2 is collected in the second predetermined region a2, or more than 60% of light intensity in a light beam incident on the plane where the second predetermined region a2 is collected in the second predetermined region a2), and the light incident on the second predetermined region a2 is distributed over the second predetermined region a 2. For example, the first predetermined area a1 may be a region of small area, such as perhaps a dot; for example, the ratio of the area of the second predetermined region a2 to the area of the first predetermined region a1 may be greater than 4. For example, the ratio of the area of the second predetermined region A2 to the area of the first predetermined region A1 may be 5 to 100. For example, the ratio of the area of the second predetermined region A2 to the area of the first predetermined region A1 may be 20 to 200. The larger the ratio of the area of the second predetermined region a2 to the area of the first predetermined region a1, the more power consumption can be reduced while ensuring the brightness of the screen. Therefore, the light emitted from the light source 100 can be accurately focused on the first predetermined area, and then the light is diffused, so that the first predetermined area a1 is enlarged to the second predetermined area a2, for example, when the light diffusion element 400 has an accurately controllable diffusion function, the second predetermined area a2 is also an area obtained by accurately and controllably diffusing the first predetermined area, thereby preventing the light beam from being projected to a position where the light beam is not required to be projected, and increasing the visible range while saving power consumption.

It will be appreciated that the heads-up display device, when in use, may also be fitted with a reflective imaging element, such as a windscreen or imaging window, on which light exiting the heads-up display device is reflected, so that the driver or passenger may see the virtual image. Referring to fig. 2, fig. 2 is a schematic view of a head-up display device according to another embodiment of the invention. In contrast to fig. 1, the head-up display device in fig. 2 is provided with a transflective element 700. That is, the phrase "the second light collecting element 600 collects the image light and reflects the image light to the first predetermined area a 1" may refer to that the collected and reflected image light from the second light collecting element 600 may directly reach the first predetermined area a1 (as shown in fig. 1), or may reach the first predetermined area a1 (as shown in fig. 2) after being acted by other optical elements, and the embodiment of the present invention may be implemented with the transflective element 700 or without the transflective element 700. For example, the transflective element 700 may be a windshield or an imaging window, and light of the external environment may also be transmitted to the first predetermined region a1 and the second predetermined region a2 through the transflective element 700. For example, the transflective element 700 may be a vehicle windshield, the external environment may be an environment outside the vehicle windshield, and the viewing area may be an observer inside the vehicle windshield, such as a passenger or driver viewing area, that may see a virtual image of the reflection while also viewing the outside of the vehicle without affecting normal driving. Optionally, the imaging through the windshield is W-HUD (windshield-HUD), the imaging through the imaging window is C-HUD (Combiner-HUD), and the imaging window is generally a curved imaging plate made of transparent material and having a certain curvature. Since the windshield has a curved surface, when the light is reflected on the windshield or the imaging window with curvature, the light is also gathered, i.e., the transflective element 700 further controls the light to make the reflected light be gathered toward the first predetermined area a 1. Optionally, when the transflective element 700 is a windshield, a wedge-shaped film may be added, the wedge-shaped film being disposed within the interlayer of the windshield, the wedge-shaped film eliminating double images.

As shown in fig. 2, the light emitted from the second light concentrating element 600 is reflected by the transflective element 700 before reaching the second predetermined area a2, and the reflected light is concentrated in the second predetermined area a 2. It will be understood that the first predetermined area a1 and the second predetermined area a2 in the embodiment corresponding to fig. 2 are mirror images of the first predetermined area a1 and the second predetermined area a2, respectively, in the embodiment corresponding to fig. 1, with respect to the transflective element 700; that is, the positions of the first predetermined region a1 and the second predetermined region a2 with respect to the virtual image of the transflective element 700 in the embodiment corresponding to fig. 2 are the positions of the first predetermined region a1 and the second predetermined region a2, respectively, in the embodiment corresponding to fig. 1. For example, an area where an observer needs to view imaging, such as an eye box area (eyebox), may be preset according to actual requirements, where the eye box area refers to a planar area where both eyes of the observer are located and where an image displayed by the display device can be seen; for example, the second predetermined area a2 may include an eye box area, and the first predetermined area a1 may include a center of the eye box area. For example, when the two eyes of the observer are offset from the center of the eye box region by a certain distance, such as up and down, left and right, the observer can still see the image displayed on the display device as long as the two eyes of the observer are still in the eye box region. For example, with different positions in the eye box region as observation points, such as the center of the eye box or the edge of the eye box as observation points, the positions of the virtual images viewed are also different, but the difference is small and can be ignored, and it can be considered that when the images are observed in the eye box region, the positions of the virtual images are substantially fixed, and the positions of the light rays reflected on the transflective element 700 are also substantially fixed.

In the head-up display device provided by the embodiment of the invention, the light emitted by the light source 100 is collected in the first predetermined area a1 through the light guide element 200, the first light collecting element 300, the second light collecting element 600 and the like, so that the light is concentrated in the observation area as much as possible, and the utilization rate of the light and the brightness of the picture are improved; meanwhile, the light diffusion element 400 is arranged to diffuse the light gathered in the smaller area to the larger area, so that an observer such as a driver or a passenger with both eyes in the second predetermined area can observe the image of the head-up display device within a certain range, and the light beam can be prevented from reaching the position where the light beam does not need to reach, so that the imaging brightness is increased and/or the power consumption of the light source is reduced. For example, the imaging brightness of the display device provided by the embodiment of the present disclosure may be 12000 nit, specifically, the imaging brightness is the brightness of the image seen in the eye box region and reflected by the transflective element 700. For example, the above experimental conditions were FOV sizes of 5 ° × 2.3 °, and power consumption of the light source of 1W. 5 ° × 2.3 ° indicates a horizontal FOV of 5 ° and a vertical FOV of 2.3 °.

On the basis of the above-described embodiments of the present invention, the light diffusing element 400 may be alternatively positioned between the first light condensing element 300 and the liquid crystal panel 500, as shown in fig. 1 and 2; without limitation, in other embodiments, the position of the light diffusing element 300 may be adjusted, for example, in some embodiments, the light diffusing element 400 is located on a side of the liquid crystal panel 500 away from the first light collecting element 300, as shown in fig. 3; it should be noted that in this embodiment, the light diffusing element 400 needs to be attached to the side of the liquid crystal panel 500 away from the first light collecting element 300, if the light diffusing element is not attached to the liquid crystal panel, the final image of the diffused image light becomes blurred, and the attachment can avoid this problem. In other embodiments, the light diffusing element 400 may be disposed between the first light collecting element 300 and the liquid crystal panel 500 and on a side of the liquid crystal panel 500 away from the first light collecting element 300, so as to diffuse light better and further improve uniformity of light distribution.

On the basis of the above embodiments of the present invention, optionally, the head-up display device further includes a reflective element 800, and the reflective element 800 is disposed between the second light condensing element 600 and the transflective element 700, or the reflective element 800 is disposed between the liquid crystal panel 500 and the second light condensing element 600, as shown in fig. 4. For convenience of description, only the liquid crystal panel 500 is illustrated in fig. 4, but it should be understood that the head-up display apparatus includes the light source 100, the light guide member 200, the first light condensing element 300, the light diffusing element 400, and the like in the corresponding embodiment of fig. 4. Fig. 4 illustrates an image light emitted from a pixel on the liquid crystal panel 500 as an example, the image light is reflected by the reflective element 800, the reflected image light reaches the second light collecting element 600, and is further collected and reflected, and the image light is reflected by the transflective element 700 to reach the second predetermined area a2, or directly reaches the second predetermined area a 2; alternatively, the reflective element 800 may be disposed between the second light concentrating element 600 and the transflective element 700, the image light rays collected and reflected by the second light concentrating element 600 are reflected on the reflective element 800, and the reflected light rays are reflected by the transflective element 700 to reach the second predetermined area a2, or directly reach the second predetermined area a 2. Optionally, the reflective element 800 comprises at least one plane mirror; the plane reflector comprises a plane reflector plated with aluminum, silver or a dielectric film, and light rays are mainly subjected to mirror reflection through the plane reflector. By the reflection element 800, the space utilization rate can be improved after light is reflected, the size of the head-up display device can be reduced, and the application range of the head-up display device is further expanded.

On the basis of the above embodiments of the present invention, optionally, the light guide element 200 includes a solid transparent component 201, the solid transparent component 201 includes an end 2011 for disposing the light source 100, a refractive index of the solid transparent component is greater than 1, and the first light emitted by the light source 100 is totally reflected on an internal reflection surface of the solid transparent component and transmitted to the light emitting surface 2001, and then emitted to the first light concentrating element 300; the second light emitted from the light source 100 is transmitted to the light-emitting surface 2001 in the solid transparent member 201, and then emitted to the first light converging element 300. As shown in fig. 1 and 5, the light source 100 is disposed at the end 2011 of the solid transparent member 201, specifically, the light source 100 is disposed outside the end 2011 and can be closely attached to or kept at a certain distance from the end 2011. The cross section of the solid transparent member 201 gradually increases from the end 2011 to the light-emitting surface 2001, and the internal reflection surface of the solid transparent member 201 specifically refers to the inner surface of the boundary between the solid transparent member 201 and the external medium (such as air). Preferably, the internal reflection surface of the solid transparent member 201 may be in a conical shape, a parabolic shape, or a free-form surface shape. In fig. 5, a dot-dash line represents a first light ray emitted from the light source 100, the first light ray is totally reflected on the internal reflection surface, the totally reflected light ray is transmitted to the light emitting surface 2001, and then refracted out of the solid transparent member 201 (the process of refracting out of the solid transparent member 201 is not drawn in the drawing of the present invention), and emitted to the first light collecting element 300; the solid line light rays in fig. 5 represent the second light rays emitted from the light source 100, and the second light rays directly propagate inside the solid transparent member, are refracted out of the solid transparent member 201 (the process of refracting out of the solid transparent member 201 is not illustrated in the drawings of the present invention), and are emitted to the first light ray collecting element 300. For example, the first light includes light emitted from the light source 100 with a large dispersion angle; the second light includes light emitted from the light source 100 with a smaller dispersion angle. In order to improve the utilization rate of the light emitted from the light source 100, most of the light emitted from the light emitting surface 2001 is incident on the first light collecting element 300, for example, about 80% or more of the light emitted from the light emitting surface 2001 is incident on the first light collecting element 300, but the invention is not limited thereto. The more the light rays emitted from the light exit surface 2001 are incident on the first light ray collecting element 300, the more controllable light rays are, and the greater the brightness of the image/virtual image observed in the second predetermined area a2 is.

It can be understood that, in addition to total reflection, partial specular reflection may also occur on the internal reflection surface, and the reflected light is also emitted to the light-emitting surface 2001 and to the first light converging element 300; optionally, a reflective layer, such as aluminum plating, silver plating, or dielectric coating, may be further disposed on the outer side of the solid transparent member, and the reflectivity of the reflective layer may be 50% to 95%; the reflecting layer is arranged, so that part of the first light rays which do not meet the total reflection angle condition can be further reflected, and the light utilization rate is improved.

In this embodiment, by arranging the solid transparent member 201, the first light (light with a large dispersion angle) emitted by the light source 100 is totally emitted on the internal reflection surface of the solid transparent member 201 and transmitted to the first light collecting element 300, and the second light emitted by the light source 100 is directly transmitted to the first light collecting element 300, so that the light with a large dispersion angle emitted by the light source 100 can be collected, as much light as possible can be transmitted to the first light collecting element 300, and the light utilization rate is further improved.

On the basis of the above embodiments of the present invention, fig. 5 also shows the operation of the first light concentrating element 300 in the present embodiment. As shown in fig. 5, the first light collecting element 300 collects light rays, including the light rays emitted from the light guiding element 200; the first light collecting element 300 is used for controlling the direction of the light, collecting the light to a predetermined range, and improving the utilization rate of the light. Specifically, the first light condensing element 300 may be a lens or a lens combination, such as a convex lens, a concave lens, a fresnel lens or a lens combination, and the lens combination includes one or a combination of several of a convex lens, a concave lens or a fresnel lens. Fig. 5 schematically illustrates the first light collecting element 300 as a convex lens. For example, in the case where the first light condensing element 300 employs a single lens, the focal length of the first light condensing element 300 is 50mm to 250 mm. When the first light condensing element 300 adopts a lens combination, the equivalent focal length of the lens combination is 50mm-250 mm. It is understood that the predetermined range may be a point, such as a focal point of a convex lens, or a smaller area, and the first light converging element 300 is arranged to converge light with a certain dispersion angle, so as to improve the light utilization rate; preferably, the first light concentrating element 300 concentrates the light rays as much as possible within the second predetermined range a2, and the subsequent concentration and reflection of the light rays by the second light concentrating element 600 concentrates as much light rays as possible within the first predetermined range a 1. In fig. 5, the first light collecting element 300 corresponds to one light guide element 200 for illustration, and in other embodiments, one first light collecting element 300 may correspond to a plurality of light guide elements 200.

On the basis of the above-described embodiments of the present invention, fig. 6 is a schematic diagram showing the light diffusing element 400 in the present embodiment. Fig. 6 illustrates an example in which the light diffusing element 400 is disposed between the first light collecting element 300 and the liquid crystal panel 500, the light diffusing element 400 diffuses the light collected by the first light collecting element 300 into light beams having a certain distribution angle, and the smaller the diffusion angle, the higher the brightness of the light beams, and the larger the diffusion angle, the lower the brightness of the light beams. The dotted line in fig. 6 represents the original propagation direction of the light, and it can be seen that the light diffusion element 400 does not change the main propagation direction and the collection state of the collected light, but diffuses the collected light at a certain angle to increase the diffusion degree of the light, so that the light can be distributed in a certain area. In the embodiment shown in fig. 6, the light collected by the first light collecting element 300 passes through the light diffusing element 400 and then is diffused along the original propagation direction, the diffused light is converted into image light by the liquid crystal panel 500, and the image light is collected and reflected by the second light collecting element 600 and reaches the second predetermined area a2 directly or after being reflected by the transflective element 700; when the light diffusing element 400 is attached to the liquid crystal panel 500 at a side away from the first light collecting element 300, the light diffusing element 400 diffuses the image light, and the image light is collected and reflected by the second light collecting element 600, and directly reaches or reaches the second predetermined area a2 after being reflected by the transflective element 700, that is, the light diffusing element 400 diffuses the light collected to the first predetermined area a1 to the second predetermined area a 2.

For example, the light diffusing element 400 includes at least one of a diffractive optical element and a scattering optical element. For example, the light diffusing element 400 may be a relatively low cost scattering optical element such as a brightness enhancement film, a diffuser film, or the like. The light beam can be scattered when passing through scattering optical elements such as a light homogenizing sheet and the like, a small amount of diffraction can also be generated, the scattering plays a main role, and the light beam can form a large light spot after passing through the scattering optical elements; for example, the light diffusing element 400 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 microstructure designed on the surface, so that the diffraction can diffuse light beams, the light spot is small, and the size and the shape of the light spot can be controlled. After passing through the beam shaping element, the light is spread out and forms a beam having a predetermined cross-sectional shape, including but not limited to a line, circle, oval, square, or rectangle. By controlling the microstructure of the diffractive optical element, the diffusion angle, the cross-sectional shape and the like of light can be accurately controlled, and the diffusion effect can be accurately controlled. For example, the preset sectional shape of the diffused light beam directed to the second predetermined area a2 after passing through the light diffusing element 400 corresponds to the shape of the second predetermined area a 2. For example, when the second predetermined region a2 is provided as an eye box region, a diffractive optical element capable of diffusing a light beam having a rectangular cross-sectional shape can be selected because the eye box region is generally rectangular; the corresponding microstructure can be designed by a person skilled in the art by a beam of a desired predetermined cross-sectional shape, and thus, the specific structure of the microstructure is not described in detail in the embodiments of the present disclosure.

Further, fig. 7 is a schematic diagram illustrating that light is diffused into a light beam by the light diffusion element 400, and the light beam is diffused into a light beam with a circular cross section by the light diffusion element 400, and the light is diffused at a certain diffusion angle by the light diffusion element 400, and the diffusion angle is precisely controllable. As shown in fig. 7, the optical axis of the diffused light beam and the optical axis of the light beam incident on the light diffusing element 400 are on the same straight line, that is, the optical axis of the light beam passing through the light diffusing element 400 is not changed, and the light beam of the diffused light beam is diffused at a certain angle along the optical axis, and the light beam at the edge is taken as an example in fig. 7 for explanation. For example, the diffusion angle α of the light diffusing element 400 in the first direction ranges from 5 ° to 20 °, but is not limited thereto; the first direction is a direction parallel to the light diffusing element 400, for example, a plane where the light diffusing element 400 is located in fig. 7 is a yz plane, the first direction may be a direction along a y axis, and a diffusion angle α of the light diffusing element 400 in the first direction refers to an included angle between two maximum viewing axes of the light diffusing element 400 in the first direction, that is, an included angle between two edge rays of the diffused light beam in the first direction; the diffusion angle α of the light diffusing element 400 in the first direction may also take other value ranges as desired. For example, as shown in fig. 7, the diffusion angle β of the light diffusing element 400 in the second direction ranges from 5 ° to 20 °, but is not limited thereto. The second direction is a direction parallel to the light diffusing element 400, and the second direction is perpendicular to the first direction, for example, the plane where the light diffusing element 400 is located in fig. 7 is a yz plane, the second direction can be a direction along the z axis, and the diffusion angle β of the light diffusing element 400 in the second direction refers to an included angle between two maximum viewing axes of the light diffusing element 400 in the second direction, that is, an included angle between two edge rays of the diffused light beam in the second direction; the diffusion angle β of the light diffusing element 400 in the second direction may also take other value ranges as desired. For example, when the light spot formed by the light passing through the light diffusing element 400 in fig. 7 is a circular light, the diffusion angle is the included angle between the light at the edge of the light spot and the optical axis, and the diffusion angles in all directions are the same; for example, the light spot after the light passes through the light diffusion element 400 may be rectangular, the first direction is an extending direction of a long side of the rectangle, the second direction is an extending direction of a short side of the rectangle, the diffusion angle of the first direction is an included angle between the light connected to two ends of the long side of the rectangular light spot, and the diffusion angle of the second direction is an included angle between the light connected to two ends of the short side of the rectangular light spot.

For example, the first direction is perpendicular to the arrangement direction of the first light collection element 300, the light diffusion element 400, and the liquid crystal panel 500, and the second direction is perpendicular to the arrangement direction of the first light collection element 300, the light diffusion element 400, and the liquid crystal panel 500, referring to fig. 1, 2, and 6, the arrangement direction of the first light collection element 300, the light diffusion element 400, and the liquid crystal panel 500 is perpendicular to the first direction, and is perpendicular to the second direction, and the arrangement direction of the plurality of elements is perpendicular to the surface of the light diffusion element 400 through which light passes. In fig. 6, the light is incident on the light diffusing element 400 at a normal angle, but may be incident on the light diffusing element 400 at other angles. For example, for the light diffusing element 400, the propagation angle and the spot size of the light beam after diffusion determine the brightness and the visible range of the final image, and the visible range may be specifically the second predetermined area a2, and the smaller the diffusion angle, the higher the imaging brightness, and the smaller the range of the second predetermined area a 2; and vice versa.

Based on the above embodiments of the present invention, optionally, the head-up display device further includes a collimating element 900, as shown in fig. 8, the collimating element 900 is disposed between the light source 100 and the first light concentrating element 300, and the collimating element 900 adjusts the light emitted from the light source 100 into parallel light. In the head-up display device having the collimating element 900, the first light condensing element 300 can more easily control the collimated parallel light and can condense the parallel light better. For example, as shown in fig. 8, the light emitted from the light source 100 is divided into two parts, one part of the light (the light with a small divergence angle) directly enters the collimating element 900 and is collimated by the collimating element 900 into parallel light, and the other part of the light (the light with a large divergence angle and the light with a large divergence angle after being reflected by the internal reflection surface of the light guide element 200) enters the first light condensing element 300 after being adjusted in direction by the collimating element 900.

For example, the collimating element 900 can be a collimating lens or a collimating film, the collimating lens including one or more of a convex lens, a fresnel lens, a combination of lenses (e.g., a combination of a convex lens and a concave lens, a combination of a fresnel lens and a concave lens, etc.). For example, the collimating lens may be a convex lens, and the light source 100 may be disposed at a focal point of the convex lens serving as the collimating lens, that is, a distance between the convex lens serving as the collimating lens and the position of the light source 100 is a focal length of the convex lens, so that light rays emitted by the light source 100 in different directions can be emitted in parallel after passing through the collimating element 900; for example, the collimating lens is disposed outside the light exit surface 2001 of the solid transparent member 201 in an adhering manner, and the size of the collimating lens is greater than or equal to that of the light exit surface 2001, for example, the collimating lens may be integrally formed with the solid transparent member 201; the collimating Film may be a BEF Film (Brightness Enhancement Film) for adjusting the emitting direction of the light rays to a predetermined angle range, for example, to focus the light rays in an angle range of ± 35 ° from the normal of the collimating Film.

For example, a cavity 2012 is disposed at an end 2011 of the solid transparent member 201 where the light source 100 is disposed, and the collimating element 900 is disposed at a side of the cavity 2012 close to the light-emitting surface 2001, as shown in fig. 9. The light source 100 is arranged in the cavity 2012, the collimating element 900 is arranged in the middle of the solid transparent component 201, and the size of the collimating element 900 is smaller than that of the light-emitting surface 2001 of the solid transparent component; the collimating element 900 collimates a part of the light emitted from the light source 100 in the solid transparent member and then emits the collimated light to the liquid crystal panel 500; other light rays with larger emergent angles are emergent after being totally reflected in the solid transparent part 201; for example, the collimating element 900 is a collimating lens, the light source 100 is disposed at the focal point of the collimating lens, and the collimating lens may be made of the same material as the solid transparent member 201, so as to facilitate integration.

For example, a cavity 2012 is disposed at an end 2011 of the solid transparent member 201 where the light source 100 is disposed, an opening 2013 is disposed at a light emitting surface 2001 of the solid transparent member, and the collimating element 900 is disposed at a bottom surface of the opening 2013 near the end 2011, as shown in fig. 10. The light source 100 is arranged in the cavity 2012, the solid transparent component 201 is provided with an opening 2013 in the middle of an end 2011 close to the light-emitting surface 2001, and the collimating element 900 is arranged at the bottom surface of the opening 2013 close to the end 2011; the collimating element 900 collimates a part of the light emitted from the light source 100 in the solid transparent member 201 and emits the collimated light to the liquid crystal panel 500; other light rays with larger emergent angles are emergent after being totally reflected in the solid transparent part 201; optionally, the collimating element 900 is a collimating lens, the light source 100 is disposed at a focus of the collimating lens, and the collimating lens may be made of the same material as the solid transparent member, so as to facilitate integration.

In this embodiment, by combining the collimating element 900 and the light guiding element 200, the light emitted from the light source 100 can be gathered and collimated more effectively, so as to further improve the light utilization rate, and further improve the picture brightness and reduce the power consumption of the head-up display device.

For example, one liquid crystal panel 500 is provided with one light source 100 and one light guide element. That is, the backlight of one liquid crystal panel 500 comes from one light source 100.

For example, one or more light sources 100 are correspondingly disposed on one light guide element 200, the light sources 100 are located at the end 2011 of the solid transparent member, the light sources 100 may be linearly arranged or arranged in a matrix, and further, the light sources 100 may be disposed on at least one of a white LED, a red LED, a green LED, and a blue LED, but not limited thereto; under the condition that one light source 100 is correspondingly arranged on the light guide element 200, the light emitted by one point light source is easier to control, and the utilization rate of light is more favorably improved.

For example, the shape of the light guide element 200 at the light emitting surface 2001 may match the shape of the liquid crystal panel 500, i.e., the shape of the light emitting surface 2001 may be the same as the shape of the liquid crystal panel 500. For example, in some embodiments, the shape of the light emitting surface 2001 and the shape of the liquid crystal panel 500 are both rectangular, but not limited thereto. In other embodiments, the shape of the light emitting surface 2001 and the shape of the liquid crystal panel 500 may be circular, square, or elliptical.

For example, as shown in fig. 11, the liquid crystal panel 500 includes a first polarization control element 501, a liquid crystal layer 502, and a second polarization control element 503, the first polarization control element 501 transmitting light of a first polarization characteristic, the second polarization control element 503 transmitting light of a second polarization characteristic; the light with the first polarization characteristic is orthogonal to the light with the second polarization characteristic in polarization direction. Specifically, the liquid crystal layer 502 includes a Twisted Nematic (TN) liquid crystal, a High Twisted Nematic (HTN) liquid crystal, a Super Twisted Nematic (STN) liquid crystal, a Formatted Super Twisted Nematic (FSTN) liquid crystal, a blue phase liquid crystal, or the like. The polarization direction of the light with the first polarization characteristic is orthogonal to that of the light with the second polarization state, and the polarization state specifically comprises linear polarization, elliptical polarization, circular polarization and the like; specifically, the light with the first polarization characteristic is horizontally linearly polarized light, and the light with the second polarization characteristic is vertically linearly polarized light; or the light with the first polarization characteristic is vertical linear polarized light, and the light with the second polarization characteristic is horizontal linear polarized light; or the light with the first polarization characteristic is left-handed circularly polarized light, and the light with the second polarization characteristic is right-handed circularly polarized light; or the light with the first polarization characteristic is right-handed circularly polarized light, and the light with the second polarization characteristic is left-handed circularly polarized light; or the light with the first polarization characteristic is left-handed elliptical polarized light, and the light with the second polarization characteristic is right-handed elliptical polarized light; or the light with the first polarization characteristic is right-handed elliptical polarized light, the light with the second polarization characteristic is left-handed elliptical polarized light, and the light is converted into image light by arranging the first polarization control element 501, the liquid crystal layer 502 and the second polarization control element 503, so that observers in different areas can see images.

Optionally, the head-up display device further includes a polarization control element 504, the polarization control element is located between the light source 100 and the liquid crystal panel 500, and a light transmission axis direction of the polarization control element 504 is the same as a light transmission axis direction of the second polarization control element 503, so that light that cannot penetrate through the first polarization control element 501 is removed in advance, and the light that cannot penetrate through the first polarization control element 501 is prevented from being absorbed by the liquid crystal layer 502 to generate heat, which affects the service life of the liquid crystal panel 500. The polarization control element 504 is additionally arranged in front of the liquid crystal panel 500, so that polarized light (i.e. second linearly polarized light) which cannot be utilized by the liquid crystal layer 502 can be reflected/absorbed, the liquid crystal layer is prevented from being overheated, and the service life is prolonged. For example, the polarization control element is a polarizing reflective film, which may be DBEF (trade name 3M), BEF (trade name 3M), or a photonic crystal having polarization and incident angle selective transmittance.

The embodiment of the disclosure also provides a motor vehicle comprising any one of the head-up display devices. The motor vehicle provided by the embodiment of the disclosure adopts any one of the display devices, so that a driver can directly see more abundant information such as a navigation map, complex safety information and the like without looking down at an instrument panel during driving, and the display device has low power consumption and high brightness of the display of the second predetermined area a2 due to the arrangement of the first light gathering element 300, the second light gathering element 600 and the light diffusing element 400 in the head-up display device. Therefore, the requirements of the driver for controlling various information during the running of the vehicle can be better met.

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

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

For all purposes, this patent application claims priority to chinese patent application No. 201910412245.8, filed on 2019, 5, month 17, the disclosure of which is incorporated herein in its entirety as part of an embodiment of the present disclosure.

Claims

1. A head-up display device, comprising: the light source, the light guide element, the first light gathering element, the light diffusion element, the liquid crystal panel and the second light gathering element;

the light source emits light rays;

the light guide element comprises a light-emitting surface facing the first light ray gathering element, and light is transmitted through the inside of the light guide element and emitted from the light-emitting surface to the first light ray gathering element;

the first light gathering element gathers light and transmits the light to the liquid crystal panel;

the liquid crystal panel converts light rays into image light rays;

the second light gathering element gathers the image light and reflects the image light to a first preset area;

the light diffusion element diffuses the light gathered to the first preset area to a second preset area;

the light guide element, the first light gathering element and the liquid crystal panel are sequentially arranged between the light source and the second light gathering element.

2. The heads-up display device of claim 1 further comprising: a transflective element;

the transflective element is arranged between the second light gathering element and the first predetermined region;

the image light rays collected and reflected by the second light ray collecting element are reflected to the first preset area through the transflective element.

3. The head-up display device of claim 1, wherein the light diffusing element is disposed between the first light concentrating element and the liquid crystal panel.

4. The head-up display device of claim 1, wherein the light diffusing element is attached to a side of the liquid crystal panel adjacent to the second light collecting element.

5. The heads-up display device of claim 2 further comprising: a reflective element;

the reflecting element is arranged between the second light gathering element and the transflective element;

or the reflecting element is arranged between the liquid crystal panel and the second light gathering element.

6. The heads-up display device of claim 1 wherein the light guide element comprises a solid transparent member;

the solid transparent member includes an end portion where the light source is disposed, and a refractive index of the solid transparent member is greater than 1;

the first light emitted by the light source is totally reflected on the internal reflection surface of the solid transparent component, transmitted to the light-emitting surface and emitted to the first light gathering element;

the second light emitted by the light source is transmitted to the light-emitting surface in the solid transparent component and is emitted to the first light gathering element.

7. The heads-up display device of claim 6 further comprising: a collimating element;

the collimating element is arranged between the light source and the first light gathering element, and the collimating element adjusts the light emitted by the light source into parallel light.

8. The head-up display device of claim 7, wherein the collimating element is disposed outside the light exit surface of the solid transparent member.

9. The head-up display device of claim 7, wherein the end of the solid transparent member where the light source is disposed is provided with a cavity, and the collimating element is disposed on a side of the cavity close to the light-emitting surface.

10. The head-up display device of claim 7, wherein the end of the solid transparent member where the light source is disposed is provided with a cavity, and the light exit surface of the solid transparent member is provided with an opening extending toward the end, and the collimating element is disposed at a bottom surface of the opening near the end.

11. The head-up display device according to any one of claims 1 to 10, wherein the first light condensing element comprises at least one of a convex lens, a concave lens, a fresnel lens, or a combination thereof.

12. The heads-up display device of any one of claims 1 to 10 wherein the second light collection element comprises at least one curved mirror;

and the image light is gathered and reflected on the concave surface of the curved surface reflector.

13. The heads-up display device of any one of claims 1-10 wherein the reflective element comprises at least one planar mirror.

14. The heads-up display device of any of claims 1-10 wherein the light diffusing element comprises at least one of a diffractive optical element and a scattering optical element.

15. A motor vehicle comprising a heads-up display device according to any one of claims 1 to 14.