CN117215146A - Vehicle-mounted head-up display device and vehicle - Google Patents

Abstract

The embodiment of the application provides a vehicle-mounted head-up display device and a vehicle; the vehicle-mounted head-up display device comprises a reflecting system and a reflecting projection screen arranged on one side of the reflecting system; the reflective projection screen is used for reflecting the incident projection light to the reflective system; the reflection system comprises at least one reflection element and is used for reflecting projection light rays emitted by the reflection type projection screen to a windshield of a vehicle, and the projection light rays enter human eyes after being reflected by the windshield. According to the vehicle-mounted head-up display device provided by the embodiment of the application, the diffusion film is omitted by introducing the reflective projection screen, so that the brightness and definition of a projection image can be improved.

Description

Vehicle-mounted head-up display device and vehicle

Technical Field

The embodiment of the application relates to the technical field of HUD systems, in particular to a vehicle-mounted head-up display device and a vehicle.

Background

In addition to the use of thin film field effect transistors (Thin Film Transistor, TFT), the image generating unit PGU of the existing HUD system is implemented by using LCOS projection, LBS projection, and DLP projection. In order to ensure uniformity and brightness of the formed projection image, in these projection schemes, the image source needs to be projected onto a diffusion film (Diffuser) with diffusion and deflection functions, and the light rays enter a reflection system of the HUD through the diffusion film and then enter human eyes to form a virtual image. Although the diffuser film may be used to extend the field of view angle of the projection, the diffuser film may also reduce the brightness and clarity of the projected image, thereby affecting the driver's visual experience.

Disclosure of Invention

The application aims to provide a vehicle-mounted head-up display device and a new technical scheme of a vehicle.

In a first aspect, the application provides a vehicle-mounted head-up display device. The vehicle-mounted head-up display device comprises a reflecting system and a reflecting projection screen arranged on one side of the reflecting system;

the reflective projection screen is used for reflecting the incident projection light to the reflective system;

the reflection system comprises at least one reflection element and is used for reflecting projection light rays emitted by the reflection type projection screen to a windshield of a vehicle, and the projection light rays enter human eyes after being reflected by the windshield.

Optionally, the reflective projection screen includes a reflective layer, a reflective surface of the reflective layer having a microstructure.

Optionally, the vehicle-mounted head-up display device satisfies: the angle and the diffusion angle of the principal ray emitted by the reflective projection screen are matched with the angle and the diffusion angle of the incident ray incident into the reflective system.

Optionally, the projection light is projected onto a reflective surface of the reflective projection screen and forms a real image.

Optionally, the microstructure includes a plurality of micro-reflection units arranged in a set manner, and a side length or a diameter of each micro-reflection unit is smaller than a single pixel size of an image on the reflection surface.

Optionally, the reflecting surface of the reflecting layer is a plane or a curved surface.

Optionally, the reflective projection screen further includes a light-transmitting layer, and the light-transmitting layer is stacked on the reflective surface of the reflective layer.

Optionally, the thickness of the light-transmitting layer is less than 1mm.

Optionally, the vehicle-mounted head-up display device further comprises an image generating unit, a display unit and a display unit, wherein the image generating unit is used for outputting projection light of an image to be displayed;

the reflective projection screen is arranged on a transmission path of the projection light outputted by the image generation unit.

Optionally, the reflective element of the reflective system is a free-form surface mirror or a planar mirror.

Optionally, the reflection system comprises a first free-form surface mirror and a second free-form surface mirror;

the first free-form surface reflecting mirror is positioned on a transmission path of the reflective projection screen for reflecting the projection light rays output by the image generating unit;

the second free-form surface reflector is positioned on a transmission path of the first free-form surface reflector for reflecting the projection light.

Optionally, the reflection system includes a single free-form surface mirror, and the free-form surface mirror is located on a transmission path of the reflection type projection screen for reflecting the projection light outputted by the image generation unit.

In a second aspect, the present application provides a vehicle. The vehicle on-board head-up display device according to any one of claims 1 to 12; the method comprises the steps of,

a windshield;

the windshield is arranged on a transmission path of projection light rays of the vehicle-mounted head-up display device, the windshield is used for reflecting the projection light rays reflected by the reflection system to human eyes, and a virtual image is formed at a target position A in front of the windshield by the reverse extension line of the light rays of the human eyes.

The beneficial effects of the application are as follows:

according to the vehicle-mounted head-up display device provided by the embodiment of the application, the reflective projection screen is used in the optical framework, so that projection light for imaging does not pass through a diffusion film (Diffuser) to be modulated, but is reflected to the windshield of a vehicle and enters the eyes of a person, a virtual image can be formed by projection in front of the sight of a driver, and the formed virtual image is improved in brightness and definition, so that the visual experience of a user can be improved.

Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.

Fig. 1 is a schematic structural diagram of a vehicle-mounted head-up display device according to an embodiment of the present application;

FIG. 2 is a second schematic diagram of a vehicle head-up display device according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a reflective projection screen according to an embodiment of the present application;

fig. 4 is a light path diagram of a reflective surface of a reflective projection screen according to an embodiment of the present application.

Reference numerals illustrate:

01. a human eye; 1. a reflective projection screen; 11. a reflective layer; 12. a light-transmitting layer; 2. a reflection system; 21. a first free-form surface mirror; 22. a second free-form surface mirror; 23. a free-form surface mirror; 3. an image generation unit; 4. a windshield.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The vehicle-mounted head-up display device and the vehicle provided by the embodiment of the application are described in detail below with reference to the accompanying drawings.

According to one aspect of the embodiment of the application, a vehicle-mounted head-up display device is provided. The vehicle-mounted Head-up Display device is also called Head-up Display (HUD) for short, and is a vehicle-mounted vision auxiliary system. The vehicle-mounted head-up display device is arranged in a vehicle, can be used for projecting and displaying vehicle state information such as vehicle speed and oil quantity and indication information such as navigation and danger warning at a proper position in front of the sight line of a driver, so that the sight line of the driver can be ensured not to deviate from the road surface in front, the vision blind area generated by the condition that the driver looks at an instrument panel in a low head is eliminated, and the driving safety is increased.

It should be noted that, the vehicle-mounted head-up display device provided by the embodiment of the application may be a HUD system based on a windshield, or may be a HUD system based on an augmented reality (Augmented Reality, AR) technology, which is not limited thereto.

Referring to fig. 1 and 2, the present application is illustratively shown for a windshield-based HUD system.

Referring to fig. 1 and 2, the vehicle head-up display device provided by the embodiment of the application includes a reflection system 2 and a reflection projection screen 1 disposed at one side of the reflection system 2. Wherein the reflective projection screen 1 is configured to reflect incident projection light to the reflective system 2; the reflection system 2 comprises at least one reflection element for re-reflecting the projection light rays exiting through the reflection type projection screen to the windshield 4 of the vehicle, wherein the projection light rays enter the human eye 01 after being reflected by the windshield 4.

According to the above embodiment of the present application, referring to fig. 1 and 2, for example, a projection light may be output from an image source (for example, an image generating unit PGU), and the projection light may be a light with image information and be projected onto the reflective projection screen 1. In the optical solution provided by the embodiment of the application, a reflective projection screen 1 introduced between the image source and the reflective system 2 is designed, and the reflective projection screen 1 is designed to be located at the object plane position of the vehicle head-up display device.

The reflective projection screen 1 has a reflective function, and can reflect the received projection light to the windshield 4 of the vehicle, and the projection light is reflected to the human eye 01 through the windshield 4, that is, the eyes of the driver are imaged. Referring to fig. 1, a virtual image is formed at a suitable position in front of a vehicle in a reverse extension line of an image formed at a human eye 01.

In the vehicle head-up display device provided by the embodiment of the application, the scheme of the traditional diffusion film (Diffuser) is replaced by the reflective projection screen 1, and the formed novel optical architecture can be used for solving the problem of defects caused by the diffusion film (Diffuser) in the PGU structure of the traditional HUD.

According to the vehicle-mounted head-up display device provided by the embodiment of the application, the reflective projection screen 1 is used in the optical framework, so that projection light for imaging does not pass through a diffusion film (Diffuser) to be modulated, but is reflected to the windshield 4 of a vehicle to enter the human eye 01, and is projected at the target position A in front of the sight of a driver to form a virtual image, and the formed virtual image is obviously improved in brightness and definition, so that the visual experience of a user can be improved. Wherein the position of the human eye 01 is the position of the driver's eyes.

According to the vehicle head-up display device provided by the embodiment of the application, the introduced reflective projection screen 1 can form a first set of optical systems with an image source (used for emitting projection light) on one side, and the reflective system 2 can form a second set of optical systems with a windshield 4 of a vehicle.

In some examples of the present application, referring to fig. 3 and 4, the reflective projection screen 1 includes a reflective layer 11, and a reflective surface of the reflective layer 11 has a microstructure.

The vehicle-mounted head-up display device provided by the embodiment of the application abandons the traditional transmission type diffusion film and uses the reflective projection screen 1. For example, referring to fig. 1 and 2, after reflection from the reflective projection screen 1, the projection light enters the reflective system 2 at a specific deflection angle and view angle. This particular deflection angle and field angle should be such that the requirements of the incidence of the reflection system 2 are met, so that a clear and complete projection of the resulting image is ensured.

If the specific deflection angle and the view angle cannot match the requirement of the reflection system 2 for the incident light, the projection screen formed finally may be incomplete, and the image may be missing, which may affect the look and feel of the driver.

The microstructure on the reflecting surface is mainly used for deflecting incident light and diffusing light according to a certain angle; as shown in fig. 4, the angle of deflection and the diffusion angle of the light beam are matched with the secondary optical system of the vehicle head-up display device, wherein the secondary optical system refers to the reflection system 2.

The reflective projection screen 1 includes a reflective layer 11, see fig. 3, where the reflective layer 11 may be made of a high reflectivity material to improve the light energy utilization, thereby improving the definition and brightness of the projected image.

In some examples of the application, the in-vehicle head-up display device satisfies: the angle and the diffusion angle of the chief ray exiting through the reflective projection screen 1 are adapted to the angle and the diffusion angle of the incident ray entering the reflective system 2.

According to the vehicle-mounted head-up display device provided by the embodiment of the application, the position of the reflective projection screen 1 is coincident with the object plane of the vehicle-mounted head-up display device. The angle of the chief ray exiting the microstructure on the reflecting surface and the angle of diffusion are matched to the ray incident into the reflecting system 2. In this way, the driver can be guaranteed to see a clear and complete projected image.

According to the above example, the principal ray refers to a principal ray in each field of view, and the other diffuse rays are all diffused by a certain angle about the ray, for example, 15 to 30 °.

For example, in the case where the reflection type projection screen 1 is rectangular, the diffusion angles formed in the long side direction and the short side direction are different. Specifically, the diffusion angle in the short side direction may be about 15 °, and the diffusion angle in the long side direction may be about 30 °.

In some examples of the application, the projection light is projected onto the reflective surface of the reflective projection screen 1 and forms a real image.

That is, the projection light emitted from the external image source forms an image on the reflective projection screen 1.

In some examples of the application, the microstructure includes a plurality of micro-reflective units arranged in a set manner, each of the micro-reflective units having a side length or diameter smaller than a pixel size of an image on the reflective surface.

The microstructure comprises, for example, a number of micro-reflective elements of very small dimensions, for example in the order of micrometers.

The plurality of micro-reflection units in the microstructure may be arranged in a periodic whole row or may be arranged randomly, which is not particularly limited in the present application.

For the microstructure on the reflective surface, if the size of the micro-reflective unit is too large, the uniformity of the final projection screen may be degraded. Moreover, there are periodic lines between adjacent micro-reflective elements, whether transmissive or reflective, that ultimately image.

By making the micro-reflective unit smaller than one pixel in size, interference and crosstalk on the final projected image are not caused, and the visual definition of the driver is better.

In some examples of the present application, the reflecting surface of the reflecting layer 11 is a plane or a curved surface.

According to the above example, when the reflecting surface is a plane, the field curvature and distortion of the projection image are smaller, and the imaging quality can be improved.

In some examples of the present application, the reflective projection screen further includes a light-transmitting layer 12, and the light-transmitting layer 12 is stacked on the reflective surface of the reflective layer 11.

According to the reflective projection screen provided by the embodiment of the application, the reflective projection screen can be provided with the reflective layer 11 only, and the light-transmitting layer 12 can be added on the outer side of the reflective layer 11, and the light-transmitting layer 12 can protect the reflective surface of the reflective layer 11.

Optionally, an antireflection film may be added on the surface of the light-transmitting layer 12 facing away from the reflective layer 11. By providing an antireflection film on the light-transmitting layer 12, the light-transmitting performance of the light-transmitting film 12 can be further improved, the reflectivity of the light-transmitting layer 12 can be reduced to below 0.5%, and the light efficiency is improved.

However, the thickness of the antireflection film cannot be excessively thick to prevent image ghosting due to surface reflection.

Wherein, the anti-reflection film can be formed on the surface of the light-transmitting layer 12 by a film plating mode.

In some examples of the application, the thickness of the light-transmitting layer 12 is less than 1mm.

If a light-transmitting layer 12 is added on the reflecting surface of the reflecting layer 11, the reflecting projection screen 1 has a composite structure, including the reflecting layer 11 and the light-transmitting layer 12, see fig. 3.

When the light-transmitting layer 12 is added on the reflecting layer 11, the thickness of the light-transmitting layer 12 is controlled. The thickness of the light-transmitting layer 12 is not easily excessively large, and may be 1mm or less. This is because, even though the transmittance of the light-transmitting layer 12 is high, for example, the transmittance may be 99.5%, but there is still 0.5% of reflected light inevitably, the light-transmitting layer 12 includes two faces, and when the light passes through, there is a certain amount of reflection on both faces, and if the same light is reflected by both faces, the same light does not completely overlap, and a virtual image or the like will appear in the final projection image. To avoid or mitigate this, it is desirable to design the thickness of the light-transmitting layer 12 to be smaller so that the reflected light of the same light ray on both sides does not have a significant difference, thereby ensuring the imaging quality.

In some examples of the present application, referring to fig. 1 and 2, the vehicle-mounted head-up display device further includes an image generating unit 3 for outputting projection light of an image to be displayed; the reflective projection screen 1 is disposed on a transmission path of the projection light outputted from the image generating unit 3.

According to the above example, the image generation unit 3 is configured to emit projection light of an image to be displayed.

For example, the image generation unit 3 may emit RGB light so that the resulting projection image is a color image.

The reflective projection screen 1 should be located at the object plane of the image generating unit 3, and may receive the projection light emitted by the image generating unit 3, and may redirect the projection light to the reflective system 2, where the reflective system 2 and the windshield 4 of the vehicle may be used to perform projection imaging on the projection light.

In some examples of the application, the reflective element of the reflective system 2 is a free-form surface mirror or a planar mirror.

Specifically, the reflection system 2 may include two free-form surface mirrors, one free-form surface mirror, or one plane mirror. In practical applications, the imaging distance requirement and quality can be selected.

The free-form surface reflecting mirror can correct the aberration of the image better, and is beneficial to improving the quality of the projected image.

In some examples of the application, the reflection system 2 includes a first freeform mirror 21 and a second freeform mirror 22; the first freeform surface reflecting mirror 21 is located on a transmission path of the reflective projection screen 1 for reflecting the projection light outputted from the image generating unit 3; the second freeform mirror 22 is located on a transmission path of the first freeform mirror 21 for reflecting the projection light.

In the above example, the reflection system includes two free-form surface reflectors, which can better improve the definition of the projected image.

In some examples of the application, the reflection system 2 comprises a single free-form surface mirror 23, and the free-form surface mirror 23 is located on the transmission path of the reflective projection screen 1 reflecting the projection light outputted from the image generation unit 3.

According to the above example, the reflecting system 2 comprises a single free-form mirror, which design allows to compress the volume of the whole device, while guaranteeing the basic imaging quality requirements.

According to another embodiment of the present application, a vehicle is provided. The vehicle comprises an on-board head-up display device as described in the first aspect, and a windshield 4; the windshield 4 is disposed on a transmission path of the projection light of the vehicle-mounted head-up display device, the windshield 4 is configured to reflect the projection light reflected by the reflection system to a human eye 01, and a reverse extension line of the light of the human eye 01 forms a virtual image at a target position a in front of the windshield 4, see fig. 1 and 2.

When the vehicle-mounted head-up display device provided by the embodiment of the application is used in a vehicle, the vehicle-mounted head-up display device can be matched with the windshield 4 of the vehicle to project and image the projection light rays emitted by the image generating unit 3, and finally, the human eyes 01, namely the eyes of a driver, can see the virtual image formed at the target position A in front of the windshield 4. The target position may be designed according to specific situations, and the present application is not limited thereto.

The specific implementation manner of the vehicle according to the embodiment of the present application may refer to each embodiment of the above-mentioned vehicle-mounted head-up display device, so at least the technical solutions of the above embodiments have all the beneficial effects, which are not described herein in detail.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims (13)

1. The vehicle-mounted head-up display device is characterized by comprising a reflecting system (2) and a reflecting projection screen (1) arranged on one side of the reflecting system (2);

the reflective projection screen (1) is used for reflecting the incident projection light rays to the reflective system (2);

the reflection system (2) comprises at least one reflection element for re-reflecting the projection light rays emitted by the reflection type projection screen (1) to a windshield (4) of the vehicle, wherein the projection light rays enter human eyes (01) after being reflected by the windshield (4).

2. The vehicle head-up display device according to claim 1, wherein the reflective projection screen (1) comprises a reflective layer (11), the reflective surface of the reflective layer (11) having a microstructure.

3. The in-vehicle head-up display apparatus according to claim 2, wherein the in-vehicle head-up display apparatus satisfies: the angle and the diffusion angle of the chief ray emitted by the reflective projection screen (1) are matched with the angle and the diffusion angle of the incident ray incident into the reflective system (2).

4. The vehicle head-up display device according to claim 2, wherein the projection light is projected onto the reflective surface of the reflective projection screen (1) and forms a real image.

5. The vehicle head-up display apparatus according to claim 4, wherein the microstructure includes a plurality of micro-reflection units arranged in a set manner, and a side length or a diameter of each of the micro-reflection units is smaller than a single pixel size of the image on the reflection surface.

6. The vehicle head-up display device according to claim 2, wherein the reflecting surface of the reflecting layer (11) is a flat surface or a curved surface.

7. The vehicle head-up display device according to any one of claims 2-6, wherein the reflective projection screen further comprises a light transmissive layer (12), and the light transmissive layer (12) is superimposed on a reflective surface of the reflective layer (11).

8. The vehicle head-up display device according to claim 7, wherein the thickness of the light-transmitting layer (12) is less than 1mm.

9. The in-vehicle head-up display apparatus according to claim 7, further comprising an image generation unit (3) for outputting projection light of an image to be displayed;

the reflective projection screen (1) is arranged on a transmission path of projection light outputted by the image generation unit (3).

10. The vehicle head-up display device according to claim 9, characterized in that the reflective element of the reflective system (2) is a free-form mirror or a planar mirror.

11. The vehicle head-up display device according to claim 10, wherein the reflection system (2) comprises a first free-form surface mirror (21) and a second free-form surface mirror (22);

the first free-form surface reflecting mirror (21) is positioned on a transmission path of the reflective projection screen (1) for reflecting the projection light outputted by the image generating unit (3);

the second free-form surface reflector (22) is positioned on a transmission path of the first free-form surface reflector (21) for reflecting the projection light.

12. The vehicle-mounted head-up display device according to claim 10, wherein the reflection system (2) includes a single free-form surface mirror (23), and the free-form surface mirror (23) is located on a transmission path of the reflective projection screen (1) for reflecting the projection light outputted from the image generation unit (3).

13. A vehicle, characterized by comprising:

the in-vehicle head-up display apparatus according to any one of claims 1 to 12; the method comprises the steps of,

a windshield (4);

the windshield (4) is arranged on a transmission path of projection light rays of the vehicle-mounted head-up display device, the windshield (4) is used for reflecting the projection light rays reflected by the reflection system to the human eyes (01), and a virtual image is formed at a target position A in front of the windshield (4) by the reverse extension line of the light rays of the human eyes (01).