CN218181217U

CN218181217U - Projection module, head-up display device and automobile

Info

Publication number: CN218181217U
Application number: CN202222282343.4U
Authority: CN
Inventors: 张于帅
Original assignee: Shanghai Wingtech Electronic Technology Co Ltd
Current assignee: Shanghai Wingtech Electronic Technology Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2022-12-30
Anticipated expiration: 2032-08-29

Abstract

The utility model discloses a projection module, new line display device and car, projection module include image source, optical waveguide, first lens unit and second lens unit, first lens unit is located on the emergent light path of image source, first lens unit be used for with the light collimation back coupling that the image source sent the optical waveguide makes the optical waveguide is right the light of collimation is transmitted and is jetted out, second lens unit is including throwing super lens, second lens unit is located on the emergent light path of optical waveguide, second lens unit is used for receiving the warp the light of optical waveguide coupling is and with its outgoing to predetermineeing the imaging part in order to realize the formation of image. The utility model discloses a projection module can reduce new line display device's volume.

Description

Projection module, head-up display device and automobile

Technical Field

The utility model relates to the field of optical technology, especially, relate to a projection module, new line display device and car.

Background

A Head Up Display (HUD) is an integrated electronic Display device commonly used in vehicles such as vehicles and airplanes. The head-up display device can project important driving information such as the current speed per hour, a navigation route and the like to the position above an engine hood in front of a driver or 5m in front of a vehicle head, so that the driver can see navigation or vehicle speed information without turning or lowering the head in the driving process. In the head-up display device in the prior art, a plurality of reflectors are usually used for matching to reflect light to an imaging part, and the use of the plurality of reflectors causes the head-up display device to have a large volume, easily interfere with a vehicle instrument panel tubular beam and an air conditioner pipeline, and is difficult to load.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model discloses projection module, new line display device and car can reduce new line display device's volume.

In order to realize the above-mentioned purpose, the first aspect, the utility model discloses a projection module, include:

an image source;

an optical waveguide;

the first lens unit is positioned on an emergent light path of the image source and is used for coupling light rays emitted by the image source into the optical waveguide after being collimated so that the collimated light rays are transmitted and coupled out by the optical waveguide; and

the second lens unit comprises a projection super lens, the second lens unit is located on an emergent light path of the optical waveguide, and the second lens unit is used for receiving light coupled out through the optical waveguide and emitting the light to a preset imaging component to realize imaging.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical waveguide includes a waveguide substrate, and a first grating and a second grating which are disposed on the waveguide substrate at intervals, the first grating is used to couple the light collimated by the first lens unit into the waveguide substrate, the waveguide substrate is used to transmit the coupled light to the second grating, and the second grating is used to couple out the light;

the first grating and the second grating are both volume holographic gratings.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the image source is one of a liquid crystal display device, a light emitting semiconductor display device, a liquid crystal on silicon display device, or a digital micromirror device.

As an optional implementation manner, in an embodiment of the first aspect of the present invention, the first lens unit and the second lens unit are respectively located on opposite sides of the optical waveguide.

As an alternative implementation, in an embodiment of the first aspect of the present invention, the first lens unit comprises a collimating metalens.

In a second aspect, the utility model discloses a new line display device, new line display device include the casing and as the first aspect projection module, projection module locates in the casing.

In a third aspect, the present invention discloses an automobile, the automobile comprises a vehicle body and a head-up display device according to the second aspect, the vehicle body has the imaging component, the head-up display device is disposed in the vehicle body to project to the imaging component for imaging.

As an optional implementation manner, in an embodiment of the second aspect of the present invention, the first lens unit, the second lens unit and the optical waveguide are horizontally disposed in the vehicle body, and the collimated light of the first lens unit is vertically coupled into the optical waveguide and is vertically coupled out of the optical waveguide.

As an alternative implementation, in an embodiment of the second aspect of the present invention, the first lens unit is configured to be located at an end of the optical waveguide away from the user, and the second lens unit is configured to be located at an end of the optical waveguide close to the user.

As an alternative embodiment, in an embodiment of the second aspect of the present invention, the imaging member is a wedge-shaped windshield.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the embodiment of the utility model provides a pair of projection module, new line display device and car, through the light collimation back coupling optical waveguide that first lens unit sent the image source, utilize optical waveguide transmission light and make the light coupling go out to second lens unit, throw light to the image forming part after the adjustment of second lens unit, for example windshield to form images. The utility model discloses in utilize optical waveguide and first lens unit, the second lens unit images, compare the mode that utilizes the relative setting of plane of reflection of a plurality of speculum with transmission light, first lens unit, the distance between second lens unit and the optical waveguide is nearer, be favorable to making the volume of projection module less, and simultaneously, the second lens unit is including throwing super lens, because the tolerance of throwing super lens is less, be favorable to reducing the lens quantity in the second lens unit, reduce the thickness of second lens unit on the optical axis, further reduce new line display device's volume.

Drawings

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

Fig. 1 is a schematic structural diagram of a projection module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an automobile according to an embodiment of the present invention.

Description of the main reference numerals:

10. a head-up display device; 11. an image source; 12. an optical waveguide; 13. a first lens unit; 14. a second lens unit; 15. a housing; 20. a vehicle body; 21. an imaging component; 100. an automobile.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or units to a particular orientation or to the particular orientation in which they are constructed and operated.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or units. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or unit from another (the specific type and configuration may or may not be the same), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or units. "plurality" means two or more unless otherwise specified.

The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a projection module, where the projection module includes an image source 11, an optical waveguide 12, a first lens unit 13 and a second lens unit 14, the first lens unit 13 is located on an exit light path of the image source 11, the first lens unit 13 is used to couple light emitted from the image source 11 into the optical waveguide 12 after being collimated, so that the light after being collimated is transmitted and coupled out by the optical waveguide 12, the second lens unit 14 includes a projecting super lens, the second lens unit 14 is located on an exit light path of the optical waveguide 12, and the second lens unit 14 is used to receive the light coupled out by the optical waveguide 12 and emit the light to a preset imaging component 21 to realize imaging.

Because a plurality of reflectors are adopted in the head-up display device in the related art to cooperate with each other so as to transmit light emitted by the image source 11 to the imaging part 21 to realize imaging, and most reflectors are curved reflectors, the reflecting surfaces of the reflectors need to be arranged oppositely, and the interval between the reflectors is large, so that the volume of the head-up display device is large, and in the present application, the light emitted by the image source 11 is transmitted to the imaging part 21 to realize imaging by adopting the optical waveguide 12, the first lens unit 13 and the second lens unit 14, compared with the method of adopting a plurality of reflectors in the related art, light emitted by the first lens unit 13 in the present application is approximately parallel, which is not only beneficial to improving the light utilization rate, but also beneficial to reducing the distance between the first lens unit 13 and the optical waveguide 12, and light coupled out by the optical waveguide 12, so that the distance between the optical waveguide 12 and the second lens unit 14 is also appropriately reduced, thereby being beneficial to reducing the volume of the head-up display device.

In addition, the second lens unit 14 includes a projection super lens, the projection super lens may include a substrate and a plurality of nanostructures disposed on the same surface of the substrate, the plurality of nanostructures may be arranged in a plurality of ring shapes, and the width and height of the nanostructures and the distance between adjacent nanostructures may be adjusted according to actual situations. It can be understood that, since the projection super lens is a flat lens, the flat characteristic of the surface of the projection super lens is favorable for avoiding the occurrence of image distortion in projection imaging, and the projection super lens is adapted to the imaging component 21 with different curvatures, and is also favorable for reducing the chromatic aberration of imaging, so as to reduce the number of aspheric lenses for adjusting the chromatic aberration of the image, so as to reduce the size of the second lens unit 14 on the optical axis, and further be favorable for reducing the volume of the projection module, and realize the miniaturization design of the head-up display device.

It is understood that the second lens unit 14 may further include an aspherical lens in addition to the superlens, and the transmission direction of the light coupled out from the optical waveguide 12 is adjusted by the aspherical lens and the superlens together, so that the light can be adjusted to be projected to the imaging part 21.

The first lens unit 13 includes at least one lens. In some embodiments, the first lens unit 13 includes a collimating metalens, which may include a substrate and a plurality of nanostructures disposed on a same surface of the substrate, and the plurality of nanostructures may be arranged in a plurality of annular shapes. The collimating metalens are configured as lenses that collimate and couple light from the image source 11 into the optical waveguide 12. The collimating super lens is a flat lens, so that the imaging chromatic aberration is reduced, and the imaging quality is improved.

In some embodiments, the first lens unit 13 and the second lens unit 14 are respectively located on two opposite sides of the optical waveguide 12, so as to facilitate more flexible selection of directions of the light coupled into the optical waveguide 12 and the light coupled out of the optical waveguide 12. It will be appreciated that the image source 11 and the imaging component 21 are located on opposite sides of the optical waveguide 12, respectively, the first lens unit 13 being located between the optical waveguide 12 and the image source 11, and the second lens unit 14 being located between the optical waveguide 12 and the imaging component 21.

In other embodiments, the first lens unit 13, the second lens unit 14, and the image source 11 may also be located on the same side of the optical waveguide 12, respectively.

In some embodiments, the optical waveguide 12 includes a waveguide substrate, and a first grating and a second grating which are disposed on the waveguide substrate at intervals, the first grating is used for coupling the light collimated by the first lens unit 13 into the waveguide substrate, the waveguide substrate is used for transmitting the coupled light to the second grating, and the second grating is used for coupling the light out. The first grating and the second grating are both volume holographic gratings, and the volume holographic gratings have high coupling efficiency, so that the volume holographic gratings are selected as the first grating and the second grating in the embodiment, which is beneficial to enabling more light to be coupled into the optical waveguide 12 body, and further high coupling efficiency and light utilization rate are obtained.

The first grating and the second grating may be transmission type holographic gratings, that is, light emitted from the image source 11 transmits through the first grating, then emits to the waveguide substrate, is transmitted to the second grating through the waveguide substrate, transmits through the second grating, and transmits to the second lens unit 14. When the first grating and the second grating are transmission type volume holographic gratings, the first grating is disposed on the surface of the waveguide substrate where the coupling-in region is located, the second grating is disposed on the surface of the waveguide substrate where the coupling-out region is located, and if the first grating and the second grating are respectively disposed on two sides of the waveguide substrate, the first lens unit 13 and the second lens unit 14 may be respectively disposed on two opposite sides of the optical waveguide 12 as described above.

In other embodiments, optical waveguide 12 may also include a waveguide substrate and a surface relief grating for coupling in and out light.

In some embodiments, the image source 11 is one of a liquid crystal display device, a light emitting semiconductor display device, a liquid crystal on silicon display device, or a digital micromirror device. That is, the display module is suitable for various image sources 11, and can select devices to generate images together with auxiliary devices according to actual conditions.

In a second aspect, an embodiment of the present invention further provides a head-up display device, as shown in fig. 1, the head-up display device 10 includes a housing 15 and a projection module according to the first aspect, the projection module is disposed in the housing 15. The head-up display device 10 has the projection module, which is beneficial to realizing miniaturization design and reducing the occupation of the inner space of the vehicle body or the aircraft body. It can be understood that the projection module is arranged in the shell 15, so that the projection module is not only conveniently and integrally mounted in a vehicle body or an aircraft body, but also is beneficial to protecting the projection module and avoiding being damaged by collision of foreign objects.

In a third aspect, the embodiment of the present invention further provides an automobile, as shown in fig. 2, the automobile 100 includes a vehicle body 20 and the head-up display device 10 as described above, the vehicle body 20 has an imaging component 21, and the head-up display device 10 is disposed in the vehicle body 20 to project to the imaging component 21 for imaging. Among them, the imaging part 21 may be a windshield of the vehicle body 20. Because the automobile 100 is provided with the head-up display device 10, the occupation of the internal space of the automobile body 20 is reduced, the interference between the parts is avoided, and the assembly difficulty of the automobile 100 is reduced.

In some embodiments, imaging component 21 is a wedge-shaped windshield. It is understood that a wedge-shaped windshield refers to a windshield having opposing first and second ends, and the thickness of the wedge-shaped windshield gradually decreases in a direction from the first end toward the second end. The wedge-shaped windshield of the vehicle body 20 is used as the imaging part 21, on one hand, the windshield is a structural part of the vehicle body 20, and the windshield is used as the imaging part 21, so that the number of parts required by the vehicle body 20 can be reduced, and the production cost of the vehicle body 20 can be effectively reduced. On the other hand, the problem of double images of virtual images can be avoided by adopting the wedge-shaped windshield, and the imaging effect can be improved.

In some embodiments, the first lens unit, the second lens unit and the optical waveguide are horizontally disposed in the vehicle body 20, so that the light collimated by the first lens unit is vertically coupled into the optical waveguide and vertically coupled out of the optical waveguide. That is, when the head-up display device 10 is installed on the vehicle body 20 for initialization, the light collimated by the first lens unit may be approximately perpendicular to the ground, and the light coupled out by the optical waveguide may also be approximately perpendicular to the ground, so as to test and calibrate the head-up display device 10.

It is understood that the head-up display device 10 can be adjusted to be fine-tuned during the actual driving of the automobile 100, and the optical waveguide, the first lens unit and the second lens unit can be in a non-horizontal state.

In some embodiments, the first lens unit is adapted to be located at an end of the optical waveguide remote from the user, and the second lens unit is adapted to be located at an end of the optical waveguide close to the user. In this way, the position of the head-up display device 10 on the vehicle body 20 can be appropriately moved toward the side away from the driver, that is, toward the head position of the vehicle body 20 to avoid other components required for the driving position.

The projection module, the head-up display device and the automobile disclosed by the embodiment of the invention are described in detail above, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the above embodiment is only used for helping to understand the projection module, the head-up display device and the automobile and the core idea thereof; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, and in summary, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a projection module, its characterized in that, projection module includes:

an image source;

an optical waveguide;

the first lens unit is positioned on an emergent light path of the image source and is used for coupling light rays emitted by the image source into the optical waveguide after being collimated, so that the collimated light rays are transmitted and coupled out by the optical waveguide; and

the second lens unit comprises a projection super lens, is positioned on the emergent light path of the optical waveguide and is used for receiving the light coupled out by the optical waveguide and emitting the light to a preset imaging part to realize imaging.

2. The projection module of claim 1, wherein the optical waveguide comprises a waveguide substrate and a first grating and a second grating spaced apart from the waveguide substrate, the first grating is configured to couple the light collimated by the first lens unit into the waveguide substrate, the waveguide substrate is configured to transmit the coupled light to the second grating, and the second grating is configured to couple the light out;

the first grating and the second grating are both volume holographic gratings.

3. The projection module of claim 1 wherein the first lens unit and the second lens unit are on opposite sides of the optical waveguide.

4. The projection module of claim 1 wherein the first lens unit comprises a collimating metalens.

5. The projection module of any of claims 1-4 wherein the image source is one of a liquid crystal display device, a light emitting semiconductor display device, a liquid crystal on silicon display device, or a digital micromirror device.

6. A head-up display device, comprising a housing and the projection module of any one of claims 1-5, wherein the projection module is disposed in the housing.

7. An automobile, characterized in that the automobile comprises a vehicle body having the imaging part, and the head-up display device according to claim 6, provided in the vehicle body to project onto the imaging part for imaging.

8. The vehicle of claim 7, wherein the first lens unit, the second lens unit, and the optical waveguide are disposed horizontally in the vehicle body, and wherein the collimated light from the first lens unit is coupled into and out of the optical waveguide vertically.

9. The vehicle of claim 7, wherein the first lens unit is located at an end of the optical waveguide remote from the user and the second lens unit is located at an end of the optical waveguide proximate to the user.

10. The automobile of claim 7, wherein the imaging component is a wedge-shaped windshield.