CN112526748A - Head-up display device, imaging system and vehicle - Google Patents

Abstract

The invention provides a head-up display device, an imaging system and a vehicle, wherein the head-up display device comprises: a stereoscopic image source and a curved mirror; the distance between the stereoscopic image source and the curved mirror is less than or equal to one time of the focal length of the curved mirror; the curved mirror reflects incident light out of the heads-up display device so that the light reflected out of the heads-up display device can form a stereoscopic image; the stereoscopic image source is used for emitting light rays for forming a stereoscopic image. The head-up display device, the imaging system and the vehicle provided by the embodiment of the invention can present a stereoscopic vision image which is visually and perfectly fused with a real environment, so that the horizontal parallax generated when a driver observes AR-HUD imaging is eliminated.

Description

Head-up display device, imaging system and vehicle

Technical Field

The invention relates to the technical field of computers, in particular to a head-up display device, an imaging system and a vehicle.

Background

At present, an Augmented Reality Head Up Display (AR-HUD) is one of numerous Head Up Displays (HUDs), and can realize a good visual experience. Based on the imaging principle of AR-HUD, the image projected by the image source needs to be fused with the real environment, and if the direction indication arrow needs to be precisely fused with the road, a good visual effect can be realized.

In the process of observing the image presented by the image source by the driver, because the distance between the two eyes of the driver and the image presented by the image source is relatively short, the driver finds that horizontal parallax exists between the image seen by the left eye or the image seen by the right eye and the real environment when observing the image, so that the image presented by the image source seen by the driver deviates from the real environment, and the use experience of the driver on the AR-HUD is reduced.

Disclosure of Invention

To solve the above problems, an object of an embodiment of the present invention is to provide a head-up display apparatus, an imaging system, and a vehicle.

In a first aspect, an embodiment of the present invention provides a head-up display device, including: a stereoscopic image source and a curved mirror; the distance between the stereoscopic image source and the curved mirror is less than or equal to one time of the focal length of the curved mirror;

the curved mirror reflects incident light out of the heads-up display device so that the light reflected out of the heads-up display device can form a stereoscopic image;

the stereoscopic image source is used for emitting light rays for forming a stereoscopic image.

In a second aspect, an embodiment of the present invention further provides an imaging system, including: a vehicle windshield and the head-up display device of the first aspect described above;

the vehicle windshield reflects the received light emitted by the heads-up display device to an eye box area of an observer, so that the observer can observe a stereoscopic image presented by the vehicle windshield on a side away from the heads-up display device.

In a third aspect, an embodiment of the present invention further provides a vehicle, including: an imaging system according to the second aspect.

In the solutions provided in the first to third aspects of the embodiments of the present invention, by using a stereoscopic image source to present a stereoscopic image, an imaging position of the stereoscopic image should be visually fused with a real environment as much as possible, and compared with a case where a driver finds that a horizontal parallax exists between an image seen by a left eye or an image seen by a right eye and the real environment when observing the image due to a short imaging distance in the related art, the present stereoscopic image can be visually perfectly fused with the real environment, so that the horizontal parallax generated when the driver observes the AR-HUD imaging is eliminated, and the use experience of the AR-HUD is improved.

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

Drawings

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

Fig. 1 is a schematic structural diagram illustrating a head-up display device according to embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram illustrating a stereoscopic image source in a head-up display device according to embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram illustrating a stereoscopic image source in a head-up display device according to embodiment 1 of the present invention;

fig. 4 is a schematic structural diagram illustrating a HUD with a plane mirror added thereto in a head-up display device according to embodiment 1 of the present invention;

fig. 5 is a schematic structural view showing a vehicle cabin provided in embodiment 2 of the present invention;

fig. 6 shows another schematic structural diagram of a vehicle cab provided in embodiment 2 of the present invention.

Detailed Description

At present, the HUD technique can avoid the driver to look at the distraction that the panel board leads to driving the in-process head-lowering, improves driving safety factor, also can bring better driving experience simultaneously. Therefore, a large screen full-size HUD that uses an automobile windshield for imaging is receiving increasing attention.

An Augmented Reality Head-Up Display (AR-HUD) reasonably and vividly displays some driving information in a driver sight line area through an optical system specially designed in the Augmented Reality Head-Up Display, so that the perception of the driver to the actual driving environment is further enhanced. For example, once the user drives the vehicle to deviate from a given lane, the AR-HUD system may mark a red line at the edge of the lane line to alert the driver; when driving, a bright band of a mark can be seen at the rear part of the front vehicle. Therefore, the rise of AR-HUD puts higher technical requirements on the HUD industry.

AR-HUD still has a lot of technical difficulties to overcome at present. In terms of optics, for example: how to control the field of view, the image size, and the imaging distance, which are all closely related to the final imaging effect; in terms of software, for example: how to control the algorithm to accurately process the road and environment information is also a very important part. Based on the principle of AR-HUD, the image projected by the image source needs to be visually fused with the real environment, for example, the direction indicating arrow needs to be precisely fused with the road, so that the good visual feeling can be provided for the observer. However, when the eyes of a person observe the image, horizontal parallax is generated between the object and the image, so that the image projected by the HUD cannot be visually fused with the real environment; moreover, the closer the image is to the human eye, the more severe the parallax will be. Therefore, in the process of observing the image presented by the image source by the driver, because the distance between the driver and the image presented by the image source is relatively short, the driver finds that the horizontal parallax exists between the image seen by the left eye or the image seen by the right eye and the real environment when observing the image, the image presented by the image source seen by the driver deviates from the real environment, and the use experience of the driver on the AR-HUD is reduced. Based on this, this embodiment provides a new line display equipment, imaging system and vehicle, through multiple modes such as remote formation of image and the stereo vision image that presents parallax error elimination for the image that the image source throws can carry out perfect integration in the vision with real environment, thereby eliminates the horizontal parallax error that produces when the driver observes AR-HUD formation of image, improves HUD's use experience.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.

In the following embodiments, the term "HUD" and the term "AR-HUD" both mean a head-up display device that can emit an image with an augmented reality effect.

The term "visually fused with the real environment" means that the image of the HUD presentation seen by the two eyes of the viewer is completely fused with the real environment.

Example 1

Referring to fig. 1, a schematic structural diagram of a HUD capable of eliminating horizontal parallax is shown, the embodiment proposes a head-up display device, including: a stereoscopic image source 300 and a curved mirror 102; the distance between the stereoscopic image source 300 and the curved mirror 102 is less than or equal to one focal length of the curved mirror 102.

Here, the distance between the stereoscopic image source 300 and the curved mirror 102 is less than or equal to one focal length of the curved mirror 102, that is, the stereoscopic image source 300 is disposed at a position close to the focal plane of the curved mirror or at a position where the focal plane of the curved mirror is located.

The curved mirror 102 reflects incident light out of the heads-up display device so that the light reflected out of the heads-up display device can form a stereoscopic image.

The stereoscopic image source 300 is configured to emit light rays for forming a stereoscopic image.

The curved mirror 102 may be, but is not limited to: spherical mirrors, hyperboloidal mirrors, parabolic mirrors, and freeform mirrors.

The image source 100 is capable of emitting light to present an image.

Specifically, referring to a schematic structural diagram of the stereoscopic image source shown in fig. 2, the stereoscopic image source 300 includes: an image source 100 and a blocking module; the blocking module includes a plurality of blocking units 402.

A plurality of blocking units 402 are disposed at positions close to the image source 100; the blocking units 402 of the plurality of blocking units 402 are arranged at intervals.

Each blocking unit can block part of light rays emitted by the image source, so that light rays which are not blocked by each blocking unit are reflected out of the head-up display device to form a stereoscopic image.

The stereoscopic image is in the form of an image seen by the observer.

The blocking units 402 are disposed at a distance from the image source 100.

As shown in fig. 2, the image source 100 includes 6 pixels, and the blocking module includes 5 blocking units 402 for illustration. As shown in fig. 2, since there is a space between the blocking module and the image source 100 and the blocking module can block part of light, light emitted from part of pixels (R1, R2, R3) in the image source 100 cannot reach the left eye position under the blocking of the blocking module 402, so that the left eye can only view light emitted from the pixel units L1, L2 and L3; similarly, the right eye can only view the light emitted by the pixel cells R1, R2 and R3. Therefore, the blocking module can divide the pixels of the image source 100 into two parts, and the light emitted by one part of the pixels can only reach the left-eye position, such as the light emitted by the pixels L1, L2 and L3; while another portion of the pixels emit light that reaches only the right eye position, such as the light emitted by pixels R1, R2, and R3. When displaying imaging, two images with parallax are formed by light rays respectively emitted by pixels L1, L2 and L3 and pixels R1, R2 and R3 in the image source 100, so that the image viewed by the left eye and the image viewed by the right eye of an observer have parallax, and the visual effect of enabling the observer to see stereoscopic imaging is achieved.

The pixel: including but not limited to: active emissive pixels and passive emissive pixels.

The active light emitting pixel may be, but is not limited to: pixels formed by electroluminescent light sources.

The electroluminescent light source may be, but is not limited to: light emitting diodes and organic light emitting diodes.

The passive light-emitting pixel can be, but is not limited to: liquid crystal, blue phase liquid crystal, or Digital Light Processing (DLP) image source formed pixels.

The size of each blocking unit in the blocking module and the position of each blocking unit are specially designed after precise calculation, and then imaging can be carried out at a specific position. This method does not require the viewer to wear special eyes to view the stereoscopic images, but requires the viewer to be in a specific position to view a good stereoscopic image.

In one embodiment, the barrier unit employs liquid crystal; or the blocking units adopt integral liquid crystal, and a plurality of blocking units arranged at intervals are formed by controlling the working state of the pixels of the integral liquid crystal.

In one implementation, the blocking unit of the blocking module may employ liquid crystal. When the liquid crystal of the blocking module works, the liquid crystal can enable light to penetrate through; when the liquid crystal does not work, the liquid crystal is equivalent to a light-tight baffle, and the effect that the blocking unit blocks light rays can be achieved. Specifically, when the observer needs to view the 2D image, the liquid crystal of the blocking module operates, and the image source 100 displays the 2D image normally. When the viewer needs to view the stereoscopic image, the liquid crystal of the barrier module does not work, and different pixels of the image source 100 display an image with parallax, so that the viewer can view the stereoscopic image at a specific position.

In another implementation manner, the blocking module may be a complete liquid crystal, that is, the blocking module employs an integral liquid crystal, and the blocking module is not structurally divided into a plurality of blocking units, but by controlling the operating state of the liquid crystal in the blocking module, a plurality of blocking units arranged at intervals may be formed; that is, it is possible to determine which part of the blocking layer is required to block light (corresponding to the blocking unit) and which part is required to transmit light, and the light blocking effect can be achieved. In addition, the working state of liquid crystal in the blocking module can be controlled by combining the position of human eyes, so that the blocking module can adjust which pixels are not working (namely block light rays) in real time along with the position of the human eyes, and which pixels need to be transparent (namely, no blocking unit exists), and therefore an observer can watch a stereoscopic vision image at any position, and the problem that the observer can watch the stereoscopic vision image only at a specific position after the blocking unit of the blocking module is fixed is solved.

Referring to the schematic structural diagram of another stereoscopic image source shown in fig. 3, in the HUD proposed in this embodiment, the stereoscopic image source may further include: an image source 100 and a plurality of lenticular lenses 500.

A plurality of the lenticular lenses 500 are disposed on the surface of the image source.

Each lenticular lens 500 of the plurality of lenticular lenses 500 covers at least two different columns of pixels of the image source; each of the lenticular lenses 500 is used for directing light emitted from one row of pixels to a first position and directing light emitted from another row of pixels to a second position.

Wherein the first position is a viewing position of one eye in an eye box region of an observer; the second position is a viewing position of the other eye in the eye box region of the viewer.

The eye box region refers to a region where an observer can observe an image represented by light.

The light rays emitted to the first position and the light rays emitted to the second position can form two different images, and a driver can visually see the image effect of a stereoscopic vision image formed by overlapping the two different images.

As shown in fig. 3, the stereoscopic image source refracts light emitted from pixels of different columns to different positions through the lenticular lens 500, so that stereoscopic imaging can be achieved. Specifically, as can be seen from fig. 3, in the vertical direction, the image source 100 includes 12 columns of liquid crystal, each column may include one or more pixels; for simplicity, each column of the present embodiment includes 1 pixel as an example. The plurality of vertically arranged lenticular lenses 500 may include 6 lenticular lenses, each of which covers two columns of pixels; as shown in fig. 3, the uppermost lenticular lens covers the pixels R1 and L1. Based on the refractive characteristics of the lenticular lens, by setting the curved surface of the lenticular lens, the light emitted by a column of pixels can be emitted to a first position after passing through the lenticular lens, for example, the light emitted by the pixel R1 is emitted to the position of the observation area of the right eye of the driver; while causing light from another column of pixels to pass through the lenticular lens and be directed to a second location, such as the viewing area of the left eye of the driver, where the light from pixel L1 is directed. By precisely setting the shape of the lenticular lens, it is possible to direct light emitted from a portion of the pixels to a first position and to direct light emitted from another portion of the pixels to a second position. That is, as shown in fig. 3, light rays emitted from the pixels R1, R2, R3, R4, R5, R6, and the like can converge at the position of the right-eye viewing area, light rays emitted from the pixels L1, L2, L3, L4, L5, L6, and the like can converge at the position of the left-eye viewing area, and thus when images having parallax are displayed by different pixels of the image source 100, a stereoscopic image can be viewed at a specific position by an observer.

It can be seen from the above contents that, by using the manner of presenting the stereoscopic vision image by using the stereoscopic image source, the imaging position of the stereoscopic vision image should be visually fused with the real environment as much as possible, and compared with the situation that the horizontal parallax exists between the image seen by the left eye or the image seen by the right eye when the driver observes the image due to the close imaging distance in the related art, the horizontal parallax produced when the driver observes the AR-HUD imaging can be eliminated and the use experience of the AR-HUD can be improved due to the presentation of the stereoscopic vision image and the real environment can be perfectly fused visually.

In order to reduce the size of the HUD, referring to the schematic structural diagram of the HUD with a plane mirror added as shown in fig. 4, this embodiment proposes a HUD further including: a plane mirror 104.

The plane mirror 104 reflects the light emitted from the stereoscopic image source 300 to the curved mirror 102.

The plane mirror 104 may be disposed at any position between the light paths of the curved mirror and the light emitted from the image source, which is not described in detail in this embodiment.

It can be seen from the above that, a plane mirror can be added to the HUD to increase the number of propagation paths of light in the HUD, and the limited space in the HUD is reused, so as to reduce the volume of the HUD.

Example 2

Referring to fig. 5 and fig. 6, which are schematic structural views of different vehicle cabins, the present embodiment proposes an imaging system including: a vehicle windshield 2500 and a heads-up display device 2502 as described in embodiment 1 above.

The vehicle windshield 2500 reflects received light emitted by the heads-up display device 2502 to the eye-box area of the observer so that the observer can observe a stereoscopic image presented by the vehicle windshield 2500 on the side away from the heads-up display device.

The vehicle windshield 2500 reflects the received light emitted by the heads-up display device 2502 to the eye box area of the observer so that the observer can observe a remote virtual image of the vehicle windshield on the side away from the heads-up display device 2502.

The vehicle windshield 2500 may be, but is not limited to: transparent or non-transparent medium with certain inclination angle, such as vehicle windshield, plane mirror coated with opaque reflecting layer, and transparent resin plate.

The eye box region refers to a region where an observer can observe an image represented by light.

The embodiment also provides a vehicle which can comprise the imaging system.

In summary, in the imaging system, in the HUD, by using the stereoscopic image source to present the stereoscopic image, the imaging position of the stereoscopic image should be visually fused with the real environment as much as possible, and compared with the related art in which the imaging distance is short, which causes the driver to find that the image seen by the left eye or the image seen by the right eye has the horizontal parallax with the real environment when observing the image, because the imaging distance is far from the observer, the stereoscopic image projected by the image source can be visually perfectly fused with the real environment, thereby eliminating the horizontal parallax generated when the driver observes the AR-HUD to form an image, and improving the use experience of the AR-HUD.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention 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 invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A head-up display device, comprising: a stereoscopic image source and a curved mirror; the distance between the stereoscopic image source and the curved mirror is less than or equal to one time of the focal length of the curved mirror;

the curved mirror reflects incident light out of the heads-up display device so that the light reflected out of the heads-up display device can form a stereoscopic image;

the stereoscopic image source is used for emitting light rays for forming a stereoscopic image.

2. The heads-up display device of claim 1 wherein the stereoscopic image source comprises: an image source and blocking module; the blocking module comprises a plurality of blocking units;

a plurality of blocking units are arranged at positions close to the image source; each blocking unit in the plurality of blocking units is arranged at intervals;

each blocking unit can block part of light rays emitted by the image source, so that light rays which are not blocked by each blocking unit are reflected out of the head-up display device to form a stereoscopic image.

3. The head-up display device according to claim 2, wherein the barrier unit employs liquid crystal; or

The blocking units are made of integral liquid crystal, and the blocking units arranged at intervals are formed by controlling the working state of pixels of the integral liquid crystal.

4. The heads-up display device of claim 1 wherein the stereoscopic image source further comprises: an image source and a plurality of cylindrical lenses;

the plurality of cylindrical lenses are arranged on the surface of an image source;

each of the plurality of lenticular lenses covers at least two different columns of pixels of the image source; each columnar lens is used for emitting light rays emitted by one row of pixels to a first position and emitting light rays emitted by the other row of pixels to a second position.

5. The heads-up display device of claim 1 further comprising: a plane mirror;

the plane reflector reflects the light rays emitted by the stereoscopic image source to the curved mirror.

6. An imaging system, comprising: a vehicle windscreen and the heads up display device of any one of claims 1 to 5;

the vehicle windshield reflects the received light emitted by the heads-up display device to an eye box area of an observer, so that the observer can observe a stereoscopic image presented by the vehicle windshield on a side away from the heads-up display device.

7. A vehicle, characterized by comprising: the imaging system of claim 6.

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