CN111596461A - Off-axis reflection display system and display equipment based on pinhole imaging - Google Patents
Off-axis reflection display system and display equipment based on pinhole imaging Download PDFInfo
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- CN111596461A CN111596461A CN202010702116.5A CN202010702116A CN111596461A CN 111596461 A CN111596461 A CN 111596461A CN 202010702116 A CN202010702116 A CN 202010702116A CN 111596461 A CN111596461 A CN 111596461A
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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
- G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
- G02B2027/0116—Head-up displays characterised by optical features comprising device for genereting colour display comprising devices for correcting chromatic aberration
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Abstract
The invention provides an off-axis reflection display system and display equipment based on pinhole imaging, which comprises: the image source is used for generating virtual image light rays and comprises a plurality of light sources for generating the light rays, and a plurality of light rays emitted by the plurality of light sources are synthesized into the virtual image light rays; the reflector is used for reflecting the virtual image light to a preset position; the small hole is positioned between the image source and the reflector and is used for controlling the virtual image light emitted to the reflector from the image source and enabling only one beam of light generated by each light source to reach the reflector after passing through the small hole; and the holographic optical element is used for receiving the virtual image light reflected by the reflector, redirecting the virtual image light and reflecting the virtual image light to a target position. Compared with the related art, the off-axis reflection display system and the off-axis reflection display equipment based on the pinhole imaging have the advantages of large design field of view, low cost and no color and aberration problems.
Description
Technical Field
The invention relates to the technical field of optical equipment for display, in particular to an off-axis reflective display system based on pinhole imaging and display equipment.
Background
The augmented reality technology is a new technology integrating real world information and virtual world information, visual information which is difficult to experience in a certain time space range of the original real world is overlaid after simulation through a computer and other scientific technologies, virtual information is applied to the real world and is perceived by human senses, so that the sensory experience beyond reality is achieved, and the real environment and the virtual object are overlaid on the same picture or space in real time. With the continuous development of augmented reality display technology, more and more devices capable of realizing augmented reality enter our visual field.
In the off-axis holographic reflective display system in the related art, an MEMS laser is generally used as an image source, an image is generated through high-frequency rotation of an MEMS galvanometer, the image is reflected to the surface of a holographic grating, the reflective holographic grating can redirect light rays, and the redirected light rays are converged to human eyes and directly projected on retinas, so that the off-axis holographic reflective display system has the characteristic of infinite focal length.
However, the MEMS galvanometer in the related art is generally obtained by a bulk silicon micromachining etching process, and the processing and design requirements are high, which results in high cost of the MEMS laser scanning image source; moreover, the direct projection of laser light as a high-energy light source on the retina of the human eye also has potential safety hazards, which limits the application of off-axis holographic reflective display schemes.
Therefore, there is a need for a new off-axis reflective display system based on pinhole imaging.
Disclosure of Invention
The invention aims to provide an off-axis reflective display system based on pinhole imaging, which has low processing cost and large design field of view and does not have the problems of color and aberration.
In order to achieve the above object, the present invention provides an off-axis reflective display system based on pinhole imaging, comprising:
the image source is used for generating virtual image light rays and comprises a plurality of light sources for generating the light rays, and a plurality of light rays emitted by the plurality of light sources are synthesized into the virtual image light rays;
the reflector is used for reflecting the virtual image light to a preset position;
the small hole is positioned between the image source and the reflector and is used for controlling the virtual image light emitted to the reflector by the image source and enabling only one beam of the light generated by each light source to reach the reflector after passing through the small hole;
and the holographic optical element is used for receiving the virtual image light reflected by the reflector, redirecting the virtual image light and reflecting the virtual image light to a target position.
Preferably, the off-axis reflective display system based on pinhole imaging further includes a movement control mechanism for controlling the movement of the pinhole between the image source and the reflector and a target tracking camera device for detecting the target position in real time and emitting a target position signal, and the movement control mechanism receives the target position signal and controls the movement of the pinhole according to the target position signal, so that the holographic optical element always reflects the virtual image light to the target position.
Preferably, the image source is one of a light emitting diode display, a silicon-based liquid crystal display, and an organic electroluminescent display.
Preferably, the holographic optical element is a reflective holographic grating.
The invention also provides a display device comprising the off-axis reflective display system based on pinhole imaging as described in any one of the above.
Compared with the related art, the off-axis reflective display system based on pinhole imaging comprises: the image source is used for generating virtual image light rays and comprises a plurality of light sources for generating the light rays, and a plurality of light rays emitted by the plurality of light sources are synthesized into the virtual image light rays; the reflector is used for reflecting the virtual image light to a preset position; the small hole is positioned between the image source and the reflector and is used for controlling the virtual image light emitted to the reflector by the image source and enabling only one beam of the light generated by each light source to reach the reflector after passing through the small hole; and the holographic optical element is used for receiving the virtual image light reflected by the reflector, redirecting the virtual image light and reflecting the virtual image light to a target position. The arrangement of the structure is based on the pinhole imaging principle, and the light rays with different wavelengths emitted by the light sources of the image source have the same focusing characteristic, so that the image seen by a target observer does not have the problems of color and chromatic aberration. On the other hand, the image source is one of a light-emitting diode display, a silicon-based liquid crystal display and an organic electroluminescent display, the technology is mature, the cost is low, the application is wide, and potential safety hazards to human eyes cannot be caused. The holographic optical element adopts a reflection type holographic grating, and the size of a view field can be designed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of an off-axis reflective display system based on aperture imaging according to the present invention;
FIG. 2 is a schematic view of the motion control mechanism of FIG. 1;
figure 3 is a schematic diagram of an extended entrance pupil of an off-axis reflective display system based on pinhole imaging according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides an off-axis reflective display system 100 based on aperture imaging, which includes an image source 1, a reflector 2, an aperture 3, and a holographic optical element 4.
The image source 1 is used for generating virtual image light 11, and the image source 1 comprises a plurality of light sources for generating light, and a plurality of light rays emitted by the plurality of light sources are synthesized into the virtual image light 11.
The reflector 2 is used for reflecting the virtual image light 11 to a preset position.
The aperture 3 is located between the image source 1 and the reflector 2, and is used for controlling the virtual image light 11 emitted from the image source 1 to the reflector 2, and enabling only one beam of light generated by each light source to reach the reflector 2 after passing through the aperture 3.
The holographic optical element 4 is configured to receive the virtual image light 11 reflected by the mirror 2, redirect the virtual image light, and reflect the virtual image light to a target position 20. In this embodiment, the target location is the retina of the target observer.
It should be noted that the above structure is based on the pinhole imaging principle, and has the same focusing characteristics for the light of each wavelength emitted by the multiple light sources of the image source 1, so that the image seen by the target observer has no color and color difference problems. In addition, the image source 1 comprises a plurality of light sources for generating light rays, the virtual image light rays 11 are synthesized by a plurality of light rays emitted by the plurality of light sources, only one light ray generated by each light source can reach the reflector 2 after passing through the small hole 3, and the holographic optical element 4 is used for receiving the virtual image light rays 11 reflected by the reflector 2, redirecting the virtual image light rays and reflecting the virtual image light rays to the retina of a target observer for imaging, so that the virtual image light rays 11 generated and emitted by the image source 1 can be clearly and completely imaged on the retina of the target observer.
Compared with the MEMS galvanometer laser scanning scheme in the related art, in the present embodiment, the image source 1 is one of a light emitting diode display, a silicon-based liquid crystal display, and an organic electroluminescent display, and the method has a mature technology, low cost, and a wide application range, and does not cause a potential safety hazard to human eyes, but is not limited thereto.
Preferably, in the present embodiment, the holographic optical element 4 is a reflection type holographic grating, and when the reflection type holographic grating receives the virtual image light 11 reflected by the reflector 2, the reflection type holographic grating can redirect the virtual image light 11 based on the diffraction theory of the reflection type holographic grating, and due to the angular sensitivity, the reflection type holographic grating can only reflect the virtual image light 11 at a specific angle, and by design, the virtual image light 11 at a specific direction of the reflector 2 can be reflected to enter the retina of the target observer for imaging, and the field of view can be expanded to a certain extent. In addition, the reflection-type holographic grating does not block the external light 10, so that the virtual image is superimposed on the real image, the reality enhancement is realized, and the visual effect of the target observer is improved.
In this embodiment, the off-axis reflective display system 100 based on pinhole imaging further includes a movement control mechanism 5 for controlling the movement of the pinhole 3 between the image source 1 and the reflector 2, and a target tracking camera (not shown) for detecting the target position 20 in real time and emitting a target position signal, wherein the movement control mechanism 5 receives the target position signal, controls the movement of the pinhole 3 according to the target position signal, and enables the holographic optical element 4 to always reflect the virtual image light 11 to the target position 20, thereby achieving pupil expansion and increasing wearing comfort.
The present invention also provides a display device (not shown) comprising the above-described aperture imaging based off-axis reflective display system 100 as provided by the present invention.
Compared with the related art, the off-axis reflective display system 100 based on pinhole imaging of the present invention has the same focusing characteristics for the light rays with each wavelength emitted by the multiple light sources of the image source 1 based on the pinhole imaging principle, so that the image seen by the target observer has no color and chromatic aberration problems. On the other hand, the image source 1 is one of a light emitting diode display, a silicon-based liquid crystal display and an organic electroluminescent display, and has the advantages of mature technology, low cost, wide application and no potential safety hazard to human eyes. The holographic optical element 4 adopts a reflection type holographic grating, and the size of a view field can be designed.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. An off-axis reflective display system based on aperture imaging, the off-axis reflective display system based on aperture imaging comprising:
the image source is used for generating virtual image light rays and comprises a plurality of light sources for generating the light rays, and a plurality of light rays emitted by the plurality of light sources are synthesized into the virtual image light rays;
the reflector is used for reflecting the virtual image light to a preset position;
the small hole is positioned between the image source and the reflector and is used for controlling the virtual image light emitted to the reflector by the image source and enabling only one beam of the light generated by each light source to reach the reflector after passing through the small hole;
and the holographic optical element is used for receiving the virtual image light reflected by the reflector, redirecting the virtual image light and reflecting the virtual image light to a target position.
2. The off-axis reflective display system based on pinhole imaging according to claim 1, further comprising a movement control mechanism for controlling the movement of the pinhole between the image source and the mirror and a target tracking camera for detecting the target position in real time and emitting a target position signal, wherein the movement control mechanism receives the target position signal and controls the movement of the pinhole according to the target position signal, so that the holographic optical element always reflects the virtual image light to the target position.
3. The aperture imaging based off-axis reflective display system of claim 1, wherein the image source is one of a light emitting diode display, a silicon based liquid crystal display, and an organic electroluminescent display.
4. An off-axis reflective display system based on pinhole imaging according to claim 1 wherein the holographic optical element is a reflective holographic grating.
5. A display device comprising an off-axis reflective display system based on aperture imaging as claimed in any one of claims 1 to 4.
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| CN202010702116.5A CN111596461A (en) | 2020-07-21 | 2020-07-21 | Off-axis reflection display system and display equipment based on pinhole imaging |
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| CN202010702116.5A CN111596461A (en) | 2020-07-21 | 2020-07-21 | Off-axis reflection display system and display equipment based on pinhole imaging |
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Citations (6)
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| US20020041446A1 (en) * | 2000-08-01 | 2002-04-11 | Toshiyuki Nagaoka | Image display apparatus |
| JP2006209144A (en) * | 2006-03-20 | 2006-08-10 | Sony Corp | Image display device |
| CN103837986A (en) * | 2012-11-20 | 2014-06-04 | 株式会社东芝 | Display device |
| US20150036221A1 (en) * | 2013-08-04 | 2015-02-05 | Robert S. Stephenson | Wide-field head-up display (HUD) eyeglasses |
| KR101941880B1 (en) * | 2017-07-18 | 2019-01-24 | 경희대학교 산학협력단 | Focus Free Type Display Apparatus |
| US20190361249A1 (en) * | 2017-12-18 | 2019-11-28 | Facebook Technologies, Llc | Augmented reality head-mounted display with a focus-supporting projector for pupil steering |
-
2020
- 2020-07-21 CN CN202010702116.5A patent/CN111596461A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020041446A1 (en) * | 2000-08-01 | 2002-04-11 | Toshiyuki Nagaoka | Image display apparatus |
| JP2006209144A (en) * | 2006-03-20 | 2006-08-10 | Sony Corp | Image display device |
| CN103837986A (en) * | 2012-11-20 | 2014-06-04 | 株式会社东芝 | Display device |
| US20150036221A1 (en) * | 2013-08-04 | 2015-02-05 | Robert S. Stephenson | Wide-field head-up display (HUD) eyeglasses |
| KR101941880B1 (en) * | 2017-07-18 | 2019-01-24 | 경희대학교 산학협력단 | Focus Free Type Display Apparatus |
| US20190361249A1 (en) * | 2017-12-18 | 2019-11-28 | Facebook Technologies, Llc | Augmented reality head-mounted display with a focus-supporting projector for pupil steering |
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Address after: 213000 Xinwei 1st Road, Changzhou Comprehensive Bonded Zone, Jiangsu Province Applicant after: Chengrui optics (Changzhou) Co., Ltd Address before: 213000 Xinwei 1st Road, Changzhou Comprehensive Bonded Zone, Jiangsu Province Applicant before: Ruisheng Communication Technology (Changzhou) Co.,Ltd. |
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