CN111999897A - Transmission-type head-up display based on volume holographic diffraction optics - Google Patents
Transmission-type head-up display based on volume holographic diffraction optics Download PDFInfo
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- CN111999897A CN111999897A CN202010981722.5A CN202010981722A CN111999897A CN 111999897 A CN111999897 A CN 111999897A CN 202010981722 A CN202010981722 A CN 202010981722A CN 111999897 A CN111999897 A CN 111999897A
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- display
- volume holographic
- optical
- transmissive
- holographic diffraction
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- 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
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- 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
-
- 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
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
Abstract
The invention discloses a transmission-type head-up display based on volume holographic diffraction optics, which comprises an image source system, an optical correction system, a volume holographic diffraction screen and a control system, wherein the control system is connected with the image source system, the image source system is used for emitting a display light beam, and the volume holographic diffraction screen is positioned on a propagation path of the display light beam and is used for projecting the display light beam to human eyes. The transmission type head-up display based on the volume holographic diffraction optics provided by the invention simultaneously meets the requirements of small size, large view field and large eye box.
Description
Technical Field
The embodiment of the invention relates to the technical field of head-up displays, in particular to a transmission type head-up display based on volume holographic diffraction optics.
Background
Head Up Display (HUD) is a flight aid used in an aircraft, and is a system that can project flight data onto a transparent Display component in front of a driver, so that the driver can obtain flight information while maintaining a Head Up posture.
The optical system of the head-up display on the market at present mainly uses the principle of refraction and reflection of light, adopts a reflection type structure, has a complex structure, large assembly and adjustment difficulty and high processing cost, and has the appearance size which is inconsistent with optical parameters such as a view field and the size of an eye box, so that the requirements of small size, large view field and large eye box cannot be met simultaneously.
Disclosure of Invention
The invention provides a transmission type head-up display based on volume holographic diffraction optics, which is used for simultaneously meeting the requirements of small size, large view field and large eye box.
In a first aspect, an embodiment of the present invention provides a transmissive head-up display based on volume holographic diffractive optics, including an image source system, an optical correction system, a volume holographic diffractive screen, and a control system;
the control system is connected with the image source system;
the image source system is used for emitting display beams;
the optical correction system is positioned on the propagation path of the display light beam and is used for correcting the image quality;
the volume holographic diffraction screen is positioned on the propagation path of the display beam and used for projecting the display beam to human eyes.
Optionally, the volume holographic diffraction screen includes a first transparent flat plate, a volume holographic optical film, and a second transparent flat plate sequentially arranged along the propagation direction of the display beam.
Optionally, the first transparent flat plate is an optical glass flat plate or an optical plastic flat plate, and the second transparent flat plate is an optical glass flat plate or an optical plastic flat plate.
Optionally, an optical correction system is further included;
the optical correction system is positioned on the propagation path of the display light beam; and along the display beam propagation direction, the optical correction system is positioned on one side of the volume holographic diffraction screen facing the image source system.
Optionally, the optical correction system is a free-form surface prism.
Optionally, the free-form surface prism includes an incident surface and an exit surface, the incident surface and the exit surface are both free-form surfaces, and an included angle between the propagation direction of the display beam and the optical axis direction of the free-form surface prism is smaller than 90 °.
Optionally, the free-form surface prism is a glass prism or a plastic prism.
Optionally, the image source system includes a light source, a display module, an optical projection module, and a driver;
the light source and the display module are both connected with the driver;
the light source is used for emitting an illuminating light beam;
the display module is positioned on the propagation path of the illumination light beam and is used for modulating the illumination light beam into a display light beam;
the optical projection module is located on a propagation path of the display beam.
Optionally, the display module is any one of an LCOS display panel, an LCD display panel, and an LED display panel.
Optionally, the device further comprises a shell;
the image source system, the volume holographic diffraction screen and the control system are all arranged on the shell.
According to the transmission type head-up display based on volume holographic diffraction optics, provided by the embodiment of the invention, the volume holographic diffraction screen is adopted to perform refraction, modulation and focusing on the display light beam, the problem that the field of view and the volume of the existing head-up display are limited is solved by utilizing the coherent principle of light and the diffraction characteristic of light, and the head-up display with a simple structure, a large field of view and a large eye box is realized.
Drawings
FIG. 1 is a schematic diagram of a head-up display;
fig. 2 is a schematic structural diagram of a transmissive head-up display based on volume holographic diffractive optics according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a volume holographic diffraction screen according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an image source system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another transmissive head-up display based on volume holographic diffractive optics according to an embodiment of the present invention;
FIG. 6 is a graph of a transfer function of a transmissive heads-up display in accordance with an embodiment of the present invention;
FIG. 7 is a dot-column diagram of a transmissive heads-up display in accordance with an embodiment of the present invention;
fig. 8 is a distortion curvature diagram of a transmissive head-up display according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
2. Referring to fig. 1, the head-up display includes: the image capturing device comprises an image source 10, an optical collimating system 11, a reflector 12, an optical lens group 13 and a semi-reflecting and semi-transmitting lens 14, wherein image information of the image source 10 is collimated by the optical collimating system 11 and then reflected by the reflector 12 to change the direction of a light path, the image information is focused by the optical lens group 13 and then reaches the semi-reflecting and semi-transmitting lens 14, and the semi-reflecting and semi-transmitting lens 14 reflects the image information to human eyes 15, so that the human eyes 15 can observe an enlarged image source image on the semi-reflecting and semi-transmitting lens 14, and simultaneously can observe a real scene through the semi-reflecting and semi-transmitting lens 14. The existing head-up display uses the light refraction and reflection principle, adopts a reflection type structure, has complex structure, large installation and adjustment difficulty and high processing cost, and the appearance size is inconsistent with the optical parameters such as field of view and eye box size, so that the requirements of small size, large field of view and large eye box can not be simultaneously realized.
Based on the above technical problem, an embodiment of the present invention provides a transmissive head-up display based on volume holographic diffractive optics, including an image source system, an optical correction system, a volume holographic diffractive screen, and a control system, where the control system is connected to the image source system, the image source system is used to emit a display light beam, and the optical correction system is located on a propagation path of the display light beam and is used to correct image quality; the volume holographic diffraction screen is positioned on a propagation path of the display beam and is used for projecting the display beam to human eyes. By adopting the technical scheme, the volume holographic diffraction screen is adopted to perform refraction, modulation and focusing on the display light beam, the problem that the field of view and the volume of the existing head-up display are limited is solved by utilizing the coherent principle of light and the diffraction characteristic of light, and the head-up display with a simple structure, a large field of view and a large eye box is realized.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 2 is a schematic structural diagram of a transmissive head-up display based on volume holographic diffractive optics according to an embodiment of the present invention, as shown in fig. 2, the transmissive head-up display according to an embodiment of the present invention includes an image source system 21, an optical correction system 24, a volume holographic diffractive screen 22 and a control system 23, the control system 23 is connected to the image source system 21, the image source system 21 is configured to emit a display light beam 31, and the optical correction system 24 is located on a propagation path of the display light beam 31 and is configured to correct image quality; the volume holographic diffraction screen 22 is located in the propagation path of the display beam 31 for projecting the display beam to the human eye 30.
Illustratively, the image source system 21 converts an externally received video signal into a laser viewable image and projects a display beam 31 representing the image. The control system 23 is connected to the image source system 21, and controls the brightness, display content, and the like of the image source system 21.
The volume holographic diffraction screen 22 is located the propagation path of the display beam 31, the display beam 31 enters the human eyes 30 after passing through the volume holographic diffraction screen 22, the human eyes 30 can observe the amplified virtual image in the projection direction of the volume holographic diffraction screen 22, and the virtual image is superposed in a real scene. The volume hologram diffraction screen 22 uses the coherence principle of light and the diffraction characteristic of light to deflect the display light beam 31 and can modulate and focus the display light beam 31. Compared with the head-up display adopting a reflection type structure in the prior art, the volume holographic diffraction screen 22 is adopted to realize the function of changing the light path of the reflector 12 and the focusing function of the optical lens group 13 at the same time, so that the number of elements of the head-up display is reduced, the space requirement of the head-up display is reduced, the structure is simple, the mounting is easy, the cost is lower, and the head-up display with a small size is facilitated; and utilize the coherent principle of light and the diffraction characteristic of light to realize head-up display function, can obtain bigger eye box and bigger visual field angle to can show more information for the user, the user still can observe the information of whole visual field when eyes rock, reduces user's fatigue.
According to the transmission type head-up display based on volume holographic diffraction optics, the volume holographic diffraction screen 22 is adopted to perform refraction, modulation and focusing on the display light beam 31, the problem that the field of view and the volume of the existing head-up display are limited is solved by utilizing the coherent principle of light and the diffraction characteristic of light, and the head-up display with a simple structure, a large field of view and a large eye box is realized.
Fig. 3 is a schematic structural diagram of a volume holographic diffraction screen according to an embodiment of the present invention, and as shown in fig. 3, optionally, the volume holographic diffraction screen 22 includes a first transparent flat plate 221, a volume holographic optical film 222, and a second transparent flat plate 223, which are sequentially disposed along the propagation direction Y of the display light beam 31.
Specifically, the volume holographic diffraction screen 22 includes a first transparent flat plate 221 and a second transparent flat plate 223, the interlayer between the first transparent flat plate 221 and the second transparent flat plate 223 is a volume holographic optical film 222, and the volume holographic optical film 222 has a function of modulating and focusing parallel light beams for turning light rays, so that the display light beams 31 are projected to human eyes, an enlarged virtual image is formed at a far distance, and the virtual image is superposed to a real scene. Among them, volume holographic optical films (HOE) are optical elements manufactured according to the principle of holography, and are generally manufactured on photosensitive film materials, and have the advantages of light weight, low cost and mass production.
Optionally, the first transparent plate 221 is an optical glass plate or an optical plastic plate, and the second transparent plate 223 is an optical glass plate or an optical plastic plate.
In other embodiments, a person skilled in the art may set the materials of the first transparent plate 221 and the second transparent plate 223 according to actual requirements, which is not limited in the embodiments of the present invention.
With continued reference to FIG. 2, optionally, optical correction system 24 is located in the propagation path of display beam 31, and along the propagation direction of display beam 31, optical correction system 24 is located on the side of volume holographic diffraction screen 22 facing image source system 21.
Specifically, as shown in fig. 2, an optical correction system 24 and a volume hologram diffraction screen 22 are sequentially arranged along the propagation direction of the display beam 31, an image formed by the image source system 21 enters the human eye 30 after passing through the optical correction system 24 and the volume hologram diffraction screen 22, the human eye 30 can observe an enlarged virtual image in the projection direction of the volume hologram diffraction screen 22, and the virtual image is superimposed in a real scene. The volume holographic diffraction screen 22 can generate off-axis aberration, such as curvature of field, distortion and the like, for the diffracted light, and the optical correction system 24 is used for correcting the off-axis aberration, which is beneficial to realizing a head-up display with high image quality.
With continued reference to fig. 2, optionally, the optical correction system 24 is a free-form prism.
The off-axis aberration generated by the volume holographic diffraction screen 22 can be corrected by adopting a free-form surface prism, and the off-axis aberration correction device is simple in structure and easy to implement.
It should be noted that the optical correction system 24 is a free-form surface prism, which is only an example, and in other embodiments, a person skilled in the art may also configure the optical correction system 24 according to actual needs, which is not limited by the embodiment of the present invention.
With continued reference to fig. 2, optionally, the free-form surface prism includes an incident surface 241 and an exit surface 242, both the incident surface 241 and the exit surface 242 are free-form surfaces, and an included angle between the propagation direction of the display beam 31 and the optical axis direction X of the free-form surface prism is smaller than 90 °.
Specifically, as shown in fig. 2, the observation positions of the free-form surface prism and the human eye 30 are respectively located at two sides of the volume hologram diffraction screen 22, the free-form surface prism includes an incident surface 241 and an exit surface 242, the display light beam 31 is incident through the incident surface 241 of the free-form surface prism and exits through the exit surface 242, an included angle between the propagation direction of the display light beam 31 and the optical axis direction X of the free-form surface prism is smaller than 90 °, that is, the display light beam 31 reaches the volume hologram diffraction screen 22 after being transmitted through the free-form surface prism. The incident surface 241 and the exit surface 242 are both free-form surfaces, and the free-form surfaces can correct off-axis aberrations such as curvature of field and distortion generated by the volume hologram diffraction screen 22, thereby realizing a head-up display with high image quality.
Optionally, the free-form surface prism is a glass prism or a plastic prism.
The glass prism has excellent temperature sensitivity and wear resistance, the plastic prism has low cost, and in other embodiments, a person skilled in the art can set the material of the free-form surface prism according to actual requirements, which is not limited in the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an image source system according to an embodiment of the present invention, as shown in fig. 4, optionally, the image source system includes a light source 41, a display module 42, an optical projection module 43, and a driver 44, where the light source 41 and the display module 42 are both connected to the driver 44, the light source 41 is configured to emit an illumination beam 45, the display module 42 is located on a propagation path of the illumination beam 45 and is configured to modulate the illumination beam 45 into a display beam 46, and the optical projection module 43 is located on a propagation path of the display beam 46.
Specifically, as shown in fig. 4, the light source 41 emits an illumination beam 45, the optical projection module 43 modulates the illumination beam 45 into a display beam 46, so as to convert the video signal into a visible image, and the optical projection module 43 enlarges and projects the visible image. The driver 44 is connected to the light source 41 and the display module 42, respectively, so as to drive the light source 41 and the display module 42 to project a visible image.
In general, the volume hologram optical film 222 is superior in performance when used for monochromatic light or narrow spectral bands, and therefore, the light source 41 may be a laser light source that emits monochromatic laser light, such as green laser light, thereby realizing a high-specification transmissive diffractive head-up display. In other embodiments, the light source 41 may be other light sources, and those skilled in the art can set the light source according to actual needs.
Optionally, the display module 42 is any one of an LCOS display panel, an LCD display panel, and an LED display panel.
The Display module 42 may be any one of an LCOS (Liquid Crystal on Silicon) Display panel, an LCD (Liquid Crystal Display) Display panel, and an LED (Light Emitting Diode) Display panel, for example, the Display module 42 is a high resolution LCOS Display panel, which is a matrix Liquid Crystal Display device based on a reflective mode and having a very small size, and is helpful for realizing a small-size head-up Display. The display module 42 is not limited to the display panel, and those skilled in the art can configure the display module 42 according to actual requirements.
Fig. 5 is a schematic structural diagram of another transmissive head-up display based on volume holographic diffraction optics according to an embodiment of the present invention, as shown in fig. 5, and optionally, the transmissive head-up display according to an embodiment of the present invention further includes a housing 50, and the image source system 21, the volume holographic diffraction screen 22 and the control system 23 are all mounted on the housing 50.
Illustratively, as shown in fig. 5, the housing 50 may include a housing, mounting structures and connection structures of the image source system 21, the optical correction system 24 and the volume holographic diffraction screen 22, and the like, wherein the image source system 21, the optical correction system 24 and the control system 23 are mounted in the accommodating space of the housing 50, the volume holographic diffraction screen 22 is mounted on the housing 50, and the housing 50 is used for ensuring the precise mounting of the fixed image source system 21, the optical correction system 24, the control system 23 and the volume holographic diffraction screen 22 and the mounting of the transmissive head-up display and the external device. The specific structure and shape of the housing 50 can be set according to practical requirements, and the embodiment of the invention is not limited thereto.
Fig. 6 is a transfer function diagram of a transmissive head-up display according to an embodiment of the present invention, fig. 7 is a dot-column diagram of a transmissive head-up display according to an embodiment of the present invention, and fig. 8 is a distortion field diagram of a transmissive head-up display according to an embodiment of the present invention. As shown in fig. 6-8, the transmissive head-up display provided by the embodiments of the present invention has less distortion and curvature of field, less parallax, and high image quality.
According to the transmission type head-up display based on the volume holographic diffraction optics, the transmission type head-up display with the advantages of simple structure, small volume, low cost, large visual field and large eye box is realized by utilizing the coherence principle of light and the diffraction characteristic of the light to perform refraction, modulation and focusing on the display light beams by utilizing the transmission type volume holographic diffraction screen, and the problem that the visual field and the volume of the existing head-up display are limited is solved. And off-axis aberration generated by the diffracted light is corrected through the free-form surface prism, so that the head-up display with low distortion and high image quality is realized. Therefore, the novel transmission type head-up display is obtained by combining volume holographic diffraction optics and traditional geometric optics, the transmission type head-up display is simple in structure and easy to install, can obtain a larger eye box, a larger view field angle and better imaging quality, and can show more information for a user, the user can still observe the information of the whole view field when eyes shake, and the fatigue of the user is reduced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A transmission type head-up display based on volume holographic diffraction optics is characterized by comprising an image source system, an optical correction system, a volume holographic diffraction screen and a control system;
the control system is connected with the image source system;
the image source system is used for emitting display beams;
the optical correction system is positioned on the propagation path of the display light beam and is used for correcting the image quality;
the volume holographic diffraction screen is positioned on the propagation path of the display beam and used for projecting the display beam to human eyes.
2. The transmissive heads-up display of claim 1 wherein the volume holographic diffraction screen comprises a first transparent plate, a volume holographic optical film, and a second transparent plate disposed in sequence along the direction of propagation of the display beam.
3. The transmissive heads-up display of claim 2 wherein the first transparent plate is an optical glass plate or an optical plastic plate and the second transparent plate is an optical glass plate or an optical plastic plate.
4. The transmissive heads-up display of claim 1 wherein the optical corrective system is located on a side of the volume holographic diffraction screen facing the image source system in the direction of display beam propagation.
5. The transmissive heads-up display of claim 4 wherein the optical correction system is a freeform prism.
6. The transmissive head-up display of claim 5, wherein the freeform prism includes an incident surface and an exit surface, both the incident surface and the exit surface being freeform surfaces, and wherein an angle between a direction of propagation of the display light beam and an optical axis direction of the freeform prism is less than 90 °.
7. The transmissive heads-up display of claim 5 wherein the freeform prism is a glass prism or a plastic prism.
8. The transmissive heads-up display of claim 1, wherein the image source system comprises a light source, a display module, an optical projection module, and a driver;
the light source and the display module are both connected with the driver;
the light source is used for emitting an illuminating light beam;
the display module is positioned on the propagation path of the illumination light beam and is used for modulating the illumination light beam into a display light beam;
the optical projection module is located on a propagation path of the display beam.
9. The transmissive heads-up display of claim 8 wherein the display module is any one of an LCOS display panel, an LCD display panel, and an LED display panel.
10. The transmissive heads-up display of claim 1 further comprising an enclosure;
the image source system, the volume holographic diffraction screen and the control system are all arranged on the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010981722.5A CN111999897A (en) | 2020-09-17 | 2020-09-17 | Transmission-type head-up display based on volume holographic diffraction optics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010981722.5A CN111999897A (en) | 2020-09-17 | 2020-09-17 | Transmission-type head-up display based on volume holographic diffraction optics |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022193728A1 (en) * | 2021-03-18 | 2022-09-22 | 歌尔股份有限公司 | Light deflection structure and head-mounted display device |
| CN115097636A (en) * | 2022-08-26 | 2022-09-23 | 杭州光粒科技有限公司 | Head-up display |
-
2020
- 2020-09-17 CN CN202010981722.5A patent/CN111999897A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022193728A1 (en) * | 2021-03-18 | 2022-09-22 | 歌尔股份有限公司 | Light deflection structure and head-mounted display device |
| CN115097636A (en) * | 2022-08-26 | 2022-09-23 | 杭州光粒科技有限公司 | Head-up display |
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