CN107843985A - Augmented reality HUD system and method - Google Patents
Augmented reality HUD system and method Download PDFInfo
- Publication number
- CN107843985A CN107843985A CN201711202499.4A CN201711202499A CN107843985A CN 107843985 A CN107843985 A CN 107843985A CN 201711202499 A CN201711202499 A CN 201711202499A CN 107843985 A CN107843985 A CN 107843985A
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- mirror
- light
- projection module
- concave mirror
- optical plane
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- 230000003190 augmentative effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 12
- 230000003287 optical effect Effects 0.000 claims abstract description 46
- 239000012788 optical film Substances 0.000 claims description 34
- 238000003384 imaging method Methods 0.000 claims description 23
- 239000010408 film Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
A kind of augmented reality HUD, including:Projection module for throw light；For through the image-forming component for formation real image and mirror image being formed on optical flat mirror for the light；For the optical flat mirror on the mirror reflection to concave mirror, image-forming component and the optical flat mirror to be sequentially arranged in the projected path of the projection module；For the concave mirror for amplifying the mirror image of the optical flat mirror reflection and being projected on holographic optics film；Holographic optics film, the holographic optics film are fixed on windshield.The present invention improves the upper limit of depth of field distance, can realize virtual configured information and the effect that real road is combined, and improves the angle of visibility of driver.
Description
Technical Field
The invention belongs to the technical field of automotive electronics, and particularly relates to an augmented reality head-up display system and method.
Background
Along with the popularization of automobile consumption, the intelligent and safety requirements of people on driving and riding of automobile products are higher and higher, a head-up display (HUD) is used as a display technology capable of projecting driving information in the driving direction, a driver can conveniently observe automobile information in the driving process, the driver does not need to leave the driving direction through eyes, and the driving safety is improved. However, the HUD products in the current market have the defect of small depth of field distance, and the distance from the eyes of a driver to an actually displayed picture can only reach 2-3 meters, so that the traditional HUD can only simply present information 2-3 meters ahead of the driver, and the reality enhancement effect, namely the effect of combining projection information with an actual road surface, cannot be realized.
Disclosure of Invention
Accordingly, an augmented reality head-up display system and method are provided to address the above technical problems.
In order to solve the technical problems, the invention adopts the following technical scheme:
an augmented reality heads-up display system comprising:
a projection module for projecting light;
the imaging element is used for enabling the light rays to pass through to form a real image and form a mirror image on the optical plane mirror;
the optical plane mirror is used for reflecting the mirror image to the concave mirror, and the imaging element and the optical plane mirror are sequentially arranged on a projection path of the projection module;
a concave mirror for amplifying the mirror image reflected by the optical plane mirror and projecting the mirror image onto the holographic optical film;
the holographic optical film is fixed on a windshield of an automobile, and the traveling direction of light and the grating structure of the holographic optical film satisfy the following relation:
where n and n' are refractive indices of the incident side and the refracted side, respectively, θ i Is the angle of incidence of the light, θ d Is the angle of refraction of the light, λ v is the wavelength of the light in vacuum, m is the diffraction order, and L is the period of the grating.
The distance from the optical plane mirror to the concave mirror is larger than the focal length of the concave mirror and smaller than twice the focal length of the concave mirror.
The projection module is arranged in an inclined upward direction, the projection direction of the projection module is in the inclined upward direction, the concave mirror is arranged on the front side of the optical plane mirror, and the holographic optical film is fixed on the inner side of a windshield of the automobile.
The projection module is a laser projection module.
The imaging element is a scattering film with a transmission >80% and a haze > 80.
The invention also relates to an augmented reality head-up display method, which comprises the following steps:
a projection module for projecting light rays is arranged;
an imaging element for allowing the light rays to pass through to form a real image and form a mirror image on the optical plane mirror is arranged;
an optical plane mirror used for reflecting the mirror image to the concave mirror is arranged, and the imaging element and the optical plane mirror are sequentially arranged on a projection path of the projection module;
a concave mirror for amplifying the mirror image reflected by the optical plane mirror and projecting the mirror image onto the holographic optical film;
the holographic optical film is arranged on the automobile windshield, and the traveling direction of light and the grating structure of the holographic optical film satisfy the following relation:
wherein n and n' are refractive indices of the incident side and the refracted side, respectively, θ i Is the angle of incidence of the light, θ d Is the angle of refraction of the light, λ v is the wavelength of the light in vacuum, m is the number of diffraction orders, and L is the period of the grating.
The distance from the optical plane mirror to the concave mirror is larger than the focal length of the concave mirror and smaller than twice the focal length of the concave mirror.
The projection module is arranged obliquely upwards, the projection direction of the projection module is obliquely upwards, the concave mirror is arranged on the front side of the optical plane mirror, and the holographic optical film is fixed on the inner side of the automobile windshield.
The projection module is a laser projection module.
The imaging element is a scattering film with a transmission >80% and a haze > 80.
The invention improves the upper limit of the depth of field distance, can realize the effect of combining virtual indication information and an actual road, and improves the visual angle of a driver.
Drawings
The invention is described in detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic diagram of the optical path and structure of the present invention;
FIG. 2 is a schematic view of a usage scenario of the present invention;
FIG. 3 is a schematic representation of the grating structure of the holographic optical film of the present invention;
FIG. 4 is a schematic view of the head-up display showing the depth of field of the virtual arrow according to the present invention.
Detailed Description
As shown in fig. 1-3, an augmented reality heads-up display system includes a projection module 11, an imaging element 12, an optical plane mirror 13, a concave mirror 14, and a holographic optical film 15.
The projection module 11 is used for projecting light rays, the projection module is arranged obliquely upwards, the projection direction is obliquely upwards, and a source image is projected onto the imaging element 12 through the projection module 11.
In the present embodiment, the projection module 11 is a laser projection module, which can provide higher brightness than an LED, and has the advantages of good monochromaticity and coherence, and the loss of surface brightness is small in the case of enlarging a screen.
The imaging element 12 and the optical flat mirror 13 are sequentially provided on a projection path of the projection module 11.
The imaging element 12 is used for forming a real image by the light rays and forming a mirror image on the optical plane mirror 13, the incident light rays pass through the imaging element 12 and are scattered out by the parallel light rays to form a real image, and the light rays are projected onto the optical plane mirror 13 to form a mirror image.
In the present embodiment, the image forming device 12 uses a scattering film with a transmittance of >80% and a haze of >80%, so that light can form a real image and transmit light, and the loss of brightness of the real image is controlled within 20%.
The optical plane mirror 13 is used to reflect the mirror image onto the concave mirror 14.
The concave mirror 14 is provided on the front side of the optical plane mirror 13 to enlarge the mirror image reflected by the optical plane mirror 13 and project it onto the hologram optical film 15, and the concave mirror 14 is swingable by a motor.
When the distance from the optical plane mirror 13 to the concave mirror 14 is greater than the focal length of the concave mirror 14 and less than twice the focal length of the concave mirror 14, an enlarged real image is formed on the holographic optical film 15.
As shown in fig. 1, the holographic optical film 15 is fixed on the inner side of the windshield 2 of the automobile, light rays show a holographic stereo image V at a distance on the holographic optical film through an optical diffraction effect, so that an effect of combining virtual indication information and an actual road is realized, and a driver can see the augmented reality effect through a sight line area E, which is shown in fig. 2.
As shown in fig. 3, assuming that the plane of the incident light is perpendicular to the grating surface, the traveling direction of the light and the grating structure of the holographic optical film 15 satisfy the following relationship:
wherein n and n' are refractive indices of the incident side and the refracted side, respectively, θ i Is the angle of incidence of the light, θ d Is the angle of refraction of the light, λ v is the wavelength of the light in vacuum, m is the diffraction order, and the grating structure repeats with a period L.
The incident angle theta can be realized by adjusting the diffraction order m, the refractive indexes n and n' of the incident side and the refractive side in the production of the holographic optical film 15 i Angle of refraction theta d After the holographic optical film 15 is formed, the concave mirror 14 is swung by a motor to adjust the incident angle θ i To adjust the desired angle of refraction theta d 。
As shown in fig. 1 to 3, the embodiment further relates to an augmented reality head-up display method, including:
1. a projection module 11 for projecting light rays is arranged, the projection module 11 is arranged obliquely upwards, the projection direction is obliquely upwards, and a source image is projected onto an imaging element 12 through the projection module 11.
In the present embodiment, the projection module 11 is a laser projection module, which can provide higher brightness than an LED, and has the advantages of good monochromaticity and coherence, and the loss of surface brightness is small in the case of enlarging a screen.
2. The imaging element 12 is arranged to allow the light to pass through the imaging element 12 to form a real image and form a mirror image on the optical plane mirror 13, and the incident light passes through the imaging element 12, is scattered out by the parallel light to form a real image, and is projected onto the optical plane mirror 13 to form a mirror image.
In the present embodiment, the imaging element 12 employs a diffuser film having a transmission >80% and a haze > 80.
3. An optical plane mirror 13 is provided for reflecting the mirror image onto a concave mirror 14.
The imaging element 12 and the optical plane mirror 13 are sequentially disposed on a projection path of the projection module 11.
4. A concave mirror 14 for amplifying the mirror image reflected by the optical flat mirror 13 and projecting it onto the hologram optical film 15 is provided, and the concave mirror 14 is provided on the front side of the optical flat mirror 13.
When the distance from the optical plane mirror 13 to the concave mirror 14 is greater than the focal length of the concave mirror 14 and less than twice the focal length of the concave mirror 14, an enlarged real image is formed on the holographic optical film 15.
5. The holographic optical film 15 is arranged on the inner side of the automobile windshield 2, as shown in fig. 1, light rays show a holographic three-dimensional image V at a distance through an optical diffraction effect on the holographic optical film, so that the effect of combining virtual indication information and an actual road is realized, and a driver can see the augmented reality effect through a sight line area E, which is shown in fig. 2.
As shown in fig. 3, assuming that the plane of the incident light is perpendicular to the grating surface, the traveling direction of the light and the grating structure of the holographic optical film 15 satisfy the following relationship:
where n and n' are refractive indices of the incident side and the refracted side, respectively, θ i Is the angle of incidence of the light, θ d Is the angle of refraction of the light, λ v is the wavelength of the light in vacuum, m is the diffraction order, and the grating structure repeats with a period L.
The incident angle theta can be realized by adjusting the diffraction order m, the refractive indexes n and n' of the incident side and the refractive side in the production of the holographic optical film 15 i Angle of refraction theta d After the hologram optical film 15 is produced, the concave mirror 14 is swung by a motor to adjust the incident angle θ i To adjust the desired angle of refraction theta d 。
As shown in fig. 4, taking the display of the first virtual arrow A1 and the second virtual arrow A2 as an example, the refraction angle θ 2 > incidence angle theta 1 The first virtual arrow A1 is then displayed at the depth distance D1. Angle of refraction theta 4 >, incident angle theta 3 And (θ) 4 -θ 3 )>(θ 2 -θ 1 ) Then a second virtual arrow A2 is presented at a greater depth-of-field distance D2.
Wherein, theta 1 To project the incident angle of the light ray of the first virtual arrow A1 on the holographic optical film 15, θ 2 is the corresponding refraction angle, θ 3 To project the incident angle, θ, of the light ray of the second virtual arrow A2 on the holographic optical film 15 4 The corresponding angle of refraction.
Therefore, the invention can adjust the incidence angle theta of the light rays i In addition, the invention enlarges the image by grating diffraction, and the visual angle is larger when the picture is larger.
However, those skilled in the art should recognize that the above-described embodiments are illustrative only, and not limiting, and that changes and modifications can be made to the above-described embodiments without departing from the true spirit and scope of the invention, which is defined by the following claims.
Claims (10)
1. An augmented reality heads-up display system, comprising:
a projection module for projecting light;
the imaging element is used for enabling the light rays to pass through to form a real image and form a mirror image on the optical plane mirror;
the optical plane mirror is used for reflecting the mirror image to the concave mirror, and the imaging element and the optical plane mirror are sequentially arranged on a projection path of the projection module;
a concave mirror for amplifying the mirror image reflected by the optical plane mirror and projecting the mirror image onto the holographic optical film;
the holographic optical film is fixed on a windshield of an automobile, and the traveling direction of light and the grating structure of the holographic optical film satisfy the following relationship:
where n and n' are refractive indices of the incident side and the refracted side, respectively, θ i Is the angle of incidence of the light, θ d Is the angle of refraction of the light, λ v is the wavelength of the light in vacuum, m is the number of diffraction orders, and L is the period of the grating.
2. The system of claim 1, wherein the distance from the optical plane mirror to the concave mirror is greater than the focal length of the concave mirror and less than twice the focal length of the concave mirror.
3. The augmented reality head-up display system of claim 1 or 2, wherein the projection module is arranged obliquely upward with its projection direction being obliquely upward, the concave mirror is disposed in front of the optical plane mirror, and the holographic optical film is fixed to the inner side of the windshield of the automobile.
4. The augmented reality heads-up display system of claim 3 wherein the projection module is a laser projection module.
5. The augmented reality heads-up display system of claim 4 wherein the imaging element is a diffuser film with transmission >80% and haze > 80%.
6. An augmented reality heads-up display method, comprising:
a projection module for projecting light rays is arranged;
an imaging element for allowing the light rays to pass through to form a real image and form a mirror image on the optical plane mirror is arranged;
an optical plane mirror for reflecting the mirror image to the concave mirror is arranged, and the imaging element and the optical plane mirror are sequentially arranged on a projection path of the projection module;
a concave mirror for amplifying the mirror image reflected by the optical plane mirror and projecting the mirror image onto the holographic optical film;
the holographic optical film is arranged on the automobile windshield, and the traveling direction of light and the grating structure of the holographic optical film satisfy the following relation:
where n and n' are refractive indices of the incident side and the refracted side, respectively, θ i Is the angle of incidence of the light, θ d Is the angle of refraction of the light, λ v is the wavelength of the light in vacuum, m is the diffraction order, and L is the period of the grating.
7. The method of claim 6, wherein the distance from the optical plane mirror to the concave mirror is greater than the focal length of the concave mirror and less than twice the focal length of the concave mirror.
8. The method as claimed in claim 6 or 7, wherein the projection module is disposed in an oblique direction, the projection direction is in an oblique direction, the concave mirror is disposed in front of the optical plane mirror, and the holographic optical film is fixed on an inner side of a windshield of the vehicle.
9. The method of claim 8, wherein the projection module is a laser projection module.
10. The method of claim 9, wherein the imaging element is a scattering film with a transmittance of >80% and a haze of > 80%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711202499.4A CN107843985A (en) | 2017-11-27 | 2017-11-27 | Augmented reality HUD system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711202499.4A CN107843985A (en) | 2017-11-27 | 2017-11-27 | Augmented reality HUD system and method |
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| CN107843985A true CN107843985A (en) | 2018-03-27 |
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| CN201711202499.4A Pending CN107843985A (en) | 2017-11-27 | 2017-11-27 | Augmented reality HUD system and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164582A (en) * | 2018-11-01 | 2019-01-08 | 京东方科技集团股份有限公司 | Head up display |
| CN109901297A (en) * | 2018-12-20 | 2019-06-18 | 苏州车萝卜汽车电子科技有限公司 | HUD imaging system, implementation method, HUD |
| CN110543016A (en) * | 2018-05-31 | 2019-12-06 | 深圳疆程技术有限公司 | A head-up display based on a laser light source |
| CN111164493A (en) * | 2018-08-29 | 2020-05-15 | 法国圣戈班玻璃厂 | Detection device for head-up display (HUD) |
| CN111352242A (en) * | 2018-12-21 | 2020-06-30 | 乐金显示有限公司 | Display device for realizing virtual image |
| CN112534334A (en) * | 2018-10-10 | 2021-03-19 | 纳宝实验室株式会社 | Three-dimensional augmented reality head-up display for realizing augmented reality for driver's viewpoint by locating image on ground |
| CN113703166A (en) * | 2021-07-30 | 2021-11-26 | 的卢技术有限公司 | AR-HUD method and system through diffraction holographic imaging |
| CN114690532A (en) * | 2020-12-31 | 2022-07-01 | 华为技术有限公司 | Display system |
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| CN110543016A (en) * | 2018-05-31 | 2019-12-06 | 深圳疆程技术有限公司 | A head-up display based on a laser light source |
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