CN110646939A - Augmented reality glasses and optical processing method - Google Patents
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- 239000011521 glass Substances 0.000 title claims abstract description 26
- 230000003190 augmentative effect Effects 0.000 title claims abstract description 24
- 238000003672 processing method Methods 0.000 title claims abstract description 11
- 238000003384 imaging method Methods 0.000 claims abstract description 50
- 230000010287 polarization Effects 0.000 claims abstract description 29
- 239000012788 optical film Substances 0.000 claims abstract description 26
- 239000010408 film Substances 0.000 claims abstract description 25
- 239000011241 protective layer Substances 0.000 claims description 59
- 239000010410 layer Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims 1
- 239000010409 thin film Substances 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004984 smart glass Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
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- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000004424 eye movement Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- G—PHYSICS
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- 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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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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
- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
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Abstract
The invention provides augmented reality glasses and an optical processing method, wherein the augmented reality glasses comprise an optical thin film, a projection lens, a polarizer and a display; the polarizer, the projection lens and the optical film are sequentially arranged on a propagation path of a second light beam emitted by the display; the optical film is provided with a third structural surface, and a polarization beam splitting film is arranged on the third structural surface; the polarizer transmits the first polarized light in the second light beam, and the first polarized light is reflected by the polarization splitting film after being emitted to the optical thin film. The polarization beam splitting film and the polarizer are combined for use, so that the energy utilization rate can be effectively improved, stray light can be eliminated, and finally, the imaging ghost image is small and the tearing feeling is small.
Description
Technical Field
The invention relates to the field of visual optics, in particular to augmented reality glasses and an optical processing method.
Background
Patent document CN105938250A provides a multi-layer augmented reality smart glasses. The multilayer imaging system includes, for example, a filter lens, a display lens, and a functional lens, which are mounted on the frame on both sides of the display lens, respectively. This patent document employs an imaging system of a three-layer structure, in which ambient light passes through a filter lens, a display lens, and a functional lens in this order before reaching the eyes of the wearer. The filter lens can select the filter characteristics according to the needs so as to filter light rays which are in adverse effect on the imaging effect of the display lens of the intelligent glasses in ambient light. The filter lenses also act as an image projection wall because the smart glasses display the screen that the lenses appear directly in front of the person's eyes as a semi-transparent virtual screen. Too strong ambient light may make it difficult for the human eye to clearly discern what is displayed on the semi-transparent virtual screen. Through the filtering of the filtering lens, a relatively dark background area is formed for the semitransparent virtual screen, so that the imaging effect of the display lens of the intelligent glasses can be enhanced. In addition, ambient light may also pass through the functional lenses after passing through the filter lenses and the smart eyewear display lenses. The functional lens may be a vision correcting lens.
This patent document effectively reduces the adverse effect of ambient light on the augmented reality effect, but fails to reasonably process the display light, and in practical application, ghost images easily appear. In addition, the smart glasses in this patent document have a large volume and a complicated structure.
Disclosure of Invention
In view of the defects in the prior art, the present invention provides augmented reality glasses and an optical processing method.
The augmented reality glasses provided by the invention comprise an optical film, a projection lens, a polarizer and a display; the polarizer, the projection lens and the optical film are sequentially arranged on a propagation path of a second light beam emitted by the display;
the optical film is provided with a third structural surface, and a polarization beam splitting film is arranged on the third structural surface;
the polarizer transmits the first polarized light in the second light beam, and the first polarized light is reflected by the polarization splitting film after being emitted to the optical thin film.
Preferably, the optical film includes an optical waveguide element, the second region is formed inside a geometrical body of the optical waveguide element, and the first region and the third region are formed in a space outside the geometrical body of the optical waveguide element;
the optical waveguide element has a first end face and a second end face; the first end surface is provided with a plurality of first tooth-shaped bulges which are distributed along the length extension direction of the optical waveguide element, and the second end surface is provided with a plurality of second tooth-shaped bulges which are distributed along the length extension direction of the optical waveguide element;
the first tooth-shaped bulge comprises a first structural surface and a second structural surface, and the second tooth-shaped bulge comprises a third structural surface and a fourth structural surface;
the first region, the second region and the third region are sequentially arranged along the direction from the first end face to the second end face.
Preferably, the optical film further comprises a planar protective layer, and the plurality of planar protective layers comprise a first protective layer and a second protective layer;
the first protective layer, the optical waveguide element and the second protective layer are sequentially arranged;
the first protection layer comprises a first protection surface and a second protection surface, and the second protection layer comprises a third protection surface and a fourth protection surface;
the first protection surface, the second protection surface, the third protection surface and the fourth protection surface are parallel to each other.
Preferably, the optical waveguide element is glued with the planar protective layer; air gaps are arranged between the first end face and the second protection face and between the second end face and the third protection face;
the optical waveguide element and the planar protection layer are made of the same or different materials; the first protective layer and the second protective layer are fixedly connected, integrally formed or separated from each other.
Preferably, the display comprises an OLED display, an LCOS display or a DMD display.
Preferably, the projection lens is a single convex lens or a lens group consisting of convex lenses and/or concave lenses; the surface of the lens of the projection lens is a spherical surface, an aspheric surface or a free-form surface;
the focal length of the projection lens is 15 mm-1000 mm.
The invention also provides an optical processing method of the augmented reality glasses, which comprises the following steps:
a light beam generating step: enabling a second light beam emitted by the display to emit to the polarizer, wherein the second light beam comprises first polarized light and second polarized light, and the vibration azimuth angles of the first polarized light and the second polarized light are different;
polarizing the light beam: the polarization state of the second light beam is appointed through the polarizer, the first polarized light is continuously transmitted through the polarizer, and the second polarized light does not pass through the polarizer;
polarized light reflection step: the first polarized light is transmitted to the optical film continuously and is reflected by the polarization beam splitting film.
Preferably, the method further comprises the following steps:
a refraction imaging step: the first light beam is emitted to the third structural surface from the second area, and then enters the third area through refraction to form a first imaging light beam;
a reflection imaging step: the first polarized light is reflected to the third area through the polarization beam splitting film and forms a second imaging light beam;
a superposition imaging step: the first imaging light beam and the second imaging light beam are imaged in a superposition mode.
Preferably, in the step of refractive imaging, the first light beam passes through the first structural surface from the first region and is refracted into the second region;
the first structural surface and the third structural surface are arranged in parallel.
Preferably, the first region and the third region are respectively provided with a first protective layer and a second protective layer;
in the refraction imaging step, the first light beam penetrates through the first protective layer and is emitted to the first structural surface, and the first light beam penetrates through the second protective layer after being refracted by the third structural surface;
in the step of reflection imaging, the first polarized light passes through the second protective layer and is emitted to the polarization beam splitting film, and the first polarized light passes through the second protective layer again after being reflected;
the propagation direction of the first light beam is unchanged after the first light beam passes through the first protective layer; the propagation direction of the first light beam is unchanged after the first light beam passes through the second protective layer; the propagation direction of the first polarized light is unchanged after the first polarized light passes through the second protective layer.
Compared with the prior art, the invention has the following beneficial effects:
1. the polarization beam splitting film and the polarizer are combined for use, so that the energy utilization rate can be effectively improved, stray light can be eliminated, and finally, the imaging ghost image is small and the tearing feeling is small.
2. The optical film has small volume, can be produced in batch and has low production cost, only one layer of polarization beam splitting film is required to be plated on the third structure surface, and the film plating process is simple.
3. In practical application, the invention can ensure that a user has a large enough eye movement range and can be matched with normal glasses for use.
4. The transmitted light rays incident at all angles are emitted from the other end according to the original angle after passing through one end of the optical waveguide element, namely the optical waveguide element does not change the propagation angle of the light rays, and the distortion and the chromatic aberration of images cannot be generated when the external environment is directly observed through the optical waveguide element.
5. The reflected light rays are reflected and emitted out from the inclined plane of the triangular bulge of the optical waveguide element, the transmission angle of the light rays is changed, the light rays on the side surface can be transmitted to a target area, and due to plane reflection, the image on the side surface cannot generate image distortion and chromatic aberration.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of an augmented reality glasses configuration;
FIG. 2 is a schematic diagram of an optical path in augmented reality glasses;
FIG. 3 is a schematic diagram of a preferred structure of a projection lens;
FIG. 4 is a schematic view of an optical film structure;
FIG. 5 is a schematic view of a planar passivation structure;
FIG. 6 is a schematic diagram of an optical waveguide device structure;
FIG. 7 is a schematic view of a connection structure of a planar protection layer and an optical waveguide device;
FIG. 8 is a schematic view of a first beam propagation path;
FIG. 9 is a schematic diagram of the transmission light path in a planar protective layer;
FIG. 10 is a schematic diagram of a transmission optical path in an optical waveguide element;
FIG. 11 is a schematic diagram of a first polarized light propagation path;
fig. 12 is a schematic view of an augmented reality glasses structure with lenses.
The figures show that:
first polarized light 33 of the planar protective layer 1
First protective surface 11 first imaging beam 34
Second protective surface 12 second imaging beam 35
Third protective surface 13 first region 41
Glue joint 19 convex lens 51
First structured surface 21 optical film 100
Second structural surface 22 projection lens 200
Third structured surface 23 polarizer 300
Fourth structural surface 24 display 400
The second light beam 32 a is the position of the user's eyes
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1 and fig. 2, the augmented reality glasses provided by the present invention include an optical film 100, a projection lens 200, a polarizer 300, and a display 400; the polarizer 300, the projection lens 200 and the optical film 100 are sequentially arranged on the propagation path of the second light beam 32 emitted by the display 400; the optical film 100 has a third structural surface 23, and a polarization splitting film is disposed on the third structural surface 23; the polarizer 300 transmits the first polarized light 33 in the second light beam 32, and the first polarized light 33 is reflected by the polarization splitting film after being emitted to the optical thin film 100. Through the combined use of the polarization light-splitting film and the polarizer 300, the energy utilization rate can be effectively improved, stray light can be eliminated, and finally, the imaging ghost image is small and the tearing feeling is small.
Preferably, the display 400 comprises an OLED display, an LCOS display, or a DMD display. Preferably, the projection lens 200 is a single convex lens 51 or a lens group consisting of a convex lens 51 and/or a concave lens 52. The projection lens 200 is used for magnifying the light beam emitted from the display 400. As shown in fig. 3, in a preferred embodiment, the projection lens 200 includes a lens group consisting of a convex lens 51 and a concave lens 52, and in practical applications, the composition of the projection lens 200 can be adjusted according to actual needs. Preferably, the surface of the lens of the projection lens 200 is a spherical surface, an aspherical surface or a free-form surface; the optical free-form surface generally refers to an optical surface that cannot be represented by spherical or aspherical coefficients, and mainly refers to a non-rotationally symmetric surface or a curve that can only be represented by a parameter vector. Preferably, the focal length of the projection lens 200 is 15mm to 1000 mm. Preferably, as shown in fig. 12, the augmented reality glasses further include a lens 500, and the optical film 100 is mounted on the inner side or the outer side of the lens 500.
As shown in fig. 4 to 7, the optical film 100 includes an optical waveguide element 2 and a planar protection layer 1, wherein a second region 42 is formed inside a geometric body of the optical waveguide element 2, and a first region 41 and a third region 43 are formed in a space outside the geometric body of the optical waveguide element 2; the optical waveguide element 2 has a first end face and a second end face; the first end surface is provided with a plurality of first tooth-shaped bulges which are arranged along the length extension direction of the optical waveguide element 2, and the second end surface is provided with a plurality of second tooth-shaped bulges which are arranged along the length extension direction of the optical waveguide element 2; the first tooth-shaped protrusion comprises a first structural surface 21 and a second structural surface 22, and the second tooth-shaped protrusion comprises a third structural surface 23 and a fourth structural surface 24; the first region 41, the second region 42, and the third region 43 are arranged in this order in the direction from the first end face to the second end face.
The plurality of planar protective layers 1 comprise a first protective layer and a second protective layer; the first protective layer, the optical waveguide element 2 and the second protective layer are sequentially arranged; the first protective layer comprises a first protective surface 11 and a second protective surface 12, and the second protective layer comprises a third protective surface 13 and a fourth protective surface 14; the first protection surface 11, the second protection surface 12, the third protection surface 13, and the fourth protection surface 14 are parallel to each other. Preferably, the optical waveguide element 2 is glued to the planar protective layer 1; air gaps 18 are respectively arranged between the first end face and the second protection face 12 and between the second end face and the third protection face 13; the optical waveguide element 2 and the planar protection layer 1 are made of the same or different materials; the first protective layer and the second protective layer are fixedly connected, integrally formed or separated from each other.
In a preferred embodiment, light rays comprising P-light and S-light emitted by the display 400 pass through a polarizer 300, the polarization state of the light is specified by the polarizer 300, the P light is continuously transmitted through the polarizer 300, the S light does not pass through the polarizer 300, the light enters the plane protective layer 1 from the fourth protective surface 14 after reaching the optical film 100, refraction takes place at the fourth protective surface 14, then refraction takes place at the third protective surface 13, out of the planar protective layer 1, into the air space 18, then reflection takes place at the third structural surface 23, because the third structure surface 23 is coated with the PBS light splitting film, the P light is totally reflected, the S light is transmitted, and because the incident light is the P light, so that all reflections are then refracted again at the third protective surface 13 into the planar protective layer 1 and then at the fourth protective surface 14 out of the planar protective layer 1 into the eye. The PBS splitting film of the third structural surface 23 corresponds to a polarization state designation form of the light by the polarizer 300, and if the polarizer 300 transmits the P light, the PBS splitting film of the third structural surface 23 reflects the P light, and if the polarizer 300 transmits the S light, the PBS splitting film of the third structural surface 23 reflects the S light.
The invention also provides an optical processing method of the augmented reality glasses, which comprises the following steps: a light beam generating step: directing a second light beam 32 emitted from the display 400 to the polarizer 300, wherein the second light beam 32 comprises a first polarized light 33 and a second polarized light, and the first polarized light 33 and the second polarized light have different vibration azimuth angles; polarizing the light beam: the polarization state of the second light beam 32 is specified through the polarizer 300, the first polarized light 33 continues to propagate through the polarizer 300, and the second polarized light does not pass through the polarizer 300; polarized light reflection step: the first polarized light 33 continues to propagate to the optical film 100 and is reflected by the polarization splitting film.
The optical processing method further comprises the following steps: a refraction imaging step: after the first light beam 31 is emitted from the second region 42 to the third structural surface 23, the first light beam is refracted to enter the third region 43 and form a first imaging light beam 34; a reflection imaging step: the first polarized light 33 is reflected to the third area 43 through the polarization splitting film and forms a second imaging light beam 35; a superposition imaging step: the first imaging beam 34 and the second imaging beam 35 are imaged in superposition. In practical applications, the first light beam 31 corresponds to light emitted from an external environment, a user obtains a scene of the real environment according to the first imaging light beam, and the second light beam 32 is emitted from the side display 400 and finally reflected by the optical film 100 to reach the eyes of the user. The external image and the side image can be observed in the target area, and the contents of the two images can be superposed to achieve the effects of combining virtuality and reality and enhancing reality.
In the step of superimposed imaging, the first imaging light beam and the second imaging light beam are emitted in parallel. In practical applications, such as AR glasses, the relative arrangement angle between the projection lens 200 and the third structural surface 23 is determined, and the second imaging light beam can be emitted at a set angle by adjusting the angle; the first imaging light beam can be approximately considered to be emitted out perpendicular to the mirror surface of the glasses all the time, so that the first imaging light beam and the second imaging light beam are emitted out in parallel, and the technical means can effectively prevent picture distortion and improve the effect of augmented reality. Of course, in practical applications, the first imaging light beam and the second imaging light beam may not be parallel, and the superposition effect may be achieved.
In an embodiment, as shown in fig. 8, in the step of refractive imaging, the first light beam 31 passes through the first structured surface 21 from the first region 41 and is refracted into the second region 42; the first structural surface 21 and the third structural surface 23 are arranged in parallel. The third structural surface 23 is necessarily arranged to be inclined with respect to the user's eye directly behind, since it is necessary to reflect the light emitted from the projection lens 200 located on the side. In the practical application process, the size of a single third structural surface 23 is small, a plurality of third structural surfaces 23 need to be sequentially arranged, and a uniform connection carrier needs to be further provided, as shown in fig. 10, the connection carrier has a first structural surface 21 parallel to the third structural surface 23 on the propagation path of the first light beam 31, otherwise, light emitted from an external environment is refracted after passing through the connection carrier, the emission angle of the light is changed, and the position of an object seen by a user through the connection carrier and the actual position are greatly deviated.
Preferably, the first region 41 and the third region 43 are respectively provided with a first protective layer and a second protective layer; in the refraction imaging step, the first light beam 31 passes through the first protective layer and is emitted to the first structural surface 21, and then passes through the second protective layer after being refracted by the third structural surface 23; as shown in fig. 11, in the reflective imaging step, the first polarized light 33 passes through the second protective layer to the third structural surface 23, and passes through the second protective layer again after being reflected. As shown in fig. 9, since the upper and lower end surfaces of the respective protective layers are parallel to each other, the propagation direction of the first light beam 31 after passing through the first protective layer is unchanged; the propagation direction of the first light beam 31 is unchanged after passing through the second protective layer; the first polarized light 33 travels through the second protective layer in the same direction.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. Augmented reality glasses comprising an optical film (100), a projection lens (200), a polarizer (300) and a display (400); the polarizer (300), the projection lens (200) and the optical film (100) are sequentially arranged on a propagation path of a second light beam (32) emitted by the display (400);
the optical film (100) is provided with a third structural surface (23), and a polarization splitting film is arranged on the third structural surface (23);
the polarizer (300) transmits the first polarized light (33) in the second light beam (32), and the first polarized light (33) is reflected by the polarization splitting film after being emitted to the optical film (100).
2. Augmented reality glasses according to claim 1, characterized in that the optical film (100) comprises an optical waveguide element (2), the second region (42) being formed inside the geometry of the optical waveguide element (2), the first region (41) and the third region (43) being formed in the space outside the geometry of the optical waveguide element (2);
the optical waveguide element (2) has a first end face and a second end face; the first end surface is provided with a plurality of first tooth-shaped bulges which are arranged along the length extension direction of the optical waveguide element (2), and the second end surface is provided with a plurality of second tooth-shaped bulges which are arranged along the length extension direction of the optical waveguide element (2);
the first tooth-shaped bulge comprises a first structural surface (21) and a second structural surface (22), and the second tooth-shaped bulge comprises a third structural surface (23) and a fourth structural surface (24);
the first region (41), the second region (42), and the third region (43) are arranged in this order in the direction from the first end face to the second end face.
3. The augmented reality glasses according to claim 2, wherein the optical film (100) further comprises a plurality of planar protection layers (1), the plurality of planar protection layers (1) comprising a first protection layer and a second protection layer;
the first protective layer, the optical waveguide element (2) and the second protective layer are sequentially arranged;
the first protection layer comprises a first protection surface (11) and a second protection surface (12), and the second protection layer comprises a third protection surface (13) and a fourth protection surface (14);
the first protection surface (11), the second protection surface (12), the third protection surface (13) and the fourth protection surface (14) are parallel to each other.
4. Augmented reality glasses according to claim 3, characterized in that the optical waveguide element (2) is glued to the planar protective layer (1); air gaps (18) are respectively arranged between the first end surface and the second protection surface (12) and between the second end surface and the third protection surface (13);
the optical waveguide element (2) and the planar protective layer (1) are made of the same or different materials; the first protective layer and the second protective layer are fixedly connected, integrally formed or separated from each other.
5. Augmented reality glasses according to any one of claims 1 to 4, wherein the display (400) comprises an OLED display, an LCOS display or a DMD display.
6. Augmented reality glasses according to any one of claims 1 to 4, characterized in that the projection lens (200) is a single convex lens (51) or a lens group of convex lenses (51) and/or concave lenses (52); the surface of the lens of the projection lens (200) is a spherical surface, an aspheric surface or a free-form surface;
the focal length of the projection lens (200) is 15 mm-1000 mm.
7. The method for optical processing of augmented reality glasses according to any one of claims 1 to 6, comprising the steps of:
a light beam generating step: directing a second light beam (32) emitted by the display (400) towards the polarizer (300), said second light beam (32) comprising light of a first polarization (33) and light of a second polarization, wherein the first polarization (33) and the second polarization have different azimuthal angles of oscillation;
polarizing the light beam: the polarization state of the second light beam (32) is appointed through the polarizer (300), the first polarized light (33) continues to propagate through the polarizer (300), and the second polarized light does not pass through the polarizer (300);
polarized light reflection step: the first polarized light (33) is allowed to continue to the optical film (100) and is reflected by the polarization splitting film.
8. An optical processing method according to claim 7, further comprising the steps of:
a refraction imaging step: the first light beam (31) is emitted to the third structural surface (23) from the second area (42), and then enters the third area (43) through refraction to form a first imaging light beam (34);
a reflection imaging step: the first polarized light (33) is reflected to the third area (43) through the polarization splitting film and forms a second imaging light beam (35);
a superposition imaging step: the first imaging light beam (34) and the second imaging light beam (35) are superposed for imaging.
9. Optical processing method according to claim 8, characterized in that in the step of refractive imaging, a first light beam (31) is refracted from a first region (41) through a first structured surface (21) into a second region (42);
the first structural surface (21) and the third structural surface (23) are arranged in parallel.
10. Optical processing method according to claim 9, characterized in that the first (41) and the third (43) regions are provided with a first protective layer, a second protective layer, respectively;
in the refraction imaging step, a first light beam (31) passes through the first protective layer and is emitted to the first structural surface (21), and then passes through the second protective layer after being refracted by the third structural surface (23);
in the step of reflection imaging, the first polarized light (33) passes through the second protective layer and is emitted to the polarization beam splitting film, and after reflection, the first polarized light passes through the second protective layer again;
the propagation direction of the first light beam (31) is unchanged after passing through the first protective layer; the propagation direction of the first light beam (31) is unchanged after passing through the second protective layer; the propagation direction of the first polarized light (33) is unchanged after passing through the second protective layer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684529A (en) * | 2020-12-28 | 2021-04-20 | 上海慧希电子科技有限公司 | Optical device, system and optical apparatus |
| CN116067628A (en) * | 2023-02-24 | 2023-05-05 | 北京至格科技有限公司 | Method and system for measuring angle of incidence space |
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