CN107065189B - optical module and augmented reality glasses - Google Patents
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- CN107065189B CN107065189B CN201710292660.5A CN201710292660A CN107065189B CN 107065189 B CN107065189 B CN 107065189B CN 201710292660 A CN201710292660 A CN 201710292660A CN 107065189 B CN107065189 B CN 107065189B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 74
- 230000003190 augmentative effect Effects 0.000 title claims abstract description 39
- 239000011521 glass Substances 0.000 title claims abstract description 23
- 230000010287 polarization Effects 0.000 claims abstract description 161
- 238000000034 method Methods 0.000 abstract description 6
- 239000010408 film Substances 0.000 description 82
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 210000003128 head Anatomy 0.000 description 2
- 239000012788 optical film Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- 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
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays 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
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
- G02B2027/0114—Head-up displays characterised by optical features comprising device for genereting colour display comprising dichroic elements
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Abstract
The application discloses an optical module and augmented reality glasses, wherein in the practical application process, emergent light of a display screen is reflected by a first polarization light splitting film and a second polarization light splitting film and then penetrates through the first polarization light splitting film and a plane lens to form first image information; the external light sequentially penetrates through the curved lens, the second polarization beam splitting film, the first polarization beam splitting film and the planar lens to form second image information, and when the optical module is used for augmented reality display, the first image information and the second image information form mixed image information; therefore, the optical module can realize the augmented reality image display only by utilizing the curved lens and the planar lens. In addition, in some embodiments of the present application, the planar lens may implement reflection and utilization of polarized light in a polarization direction in which energy occupies a larger amount in the outgoing light of the display screen through the first polarization splitting film, so as to increase the light energy utilization rate of the outgoing light of the display screen.
Description
Technical Field
The application relates to the technical field of augmented reality, more specifically say, relate to an optical module and augmented reality glasses.
Background
augmented Reality (AR) is a technology for displaying a virtual image and a real scene in a combined manner in real time, and the basic optical principle of the AR is to simultaneously emit light rays carrying real world scene information and virtual image information to human eyes, so that the image information transmitted on two optical paths is fused at the human eyes, and the human eyes can simultaneously obtain a mixed image of the real world scene information and the virtual image, thereby achieving an effect of Augmented Reality. With the continuous development of computer technology, the augmented reality technology has more and more extensive applications in various fields.
Augmented reality glasses mainly include the display screen that is used for providing virtual image light and be used for handling virtual image light and external incident light and make its optical module that fuses in the people's eye, wherein, the optical module of mainstream among the prior art divide into optical waveguide formula and free-form surface prism formula optical module, but no matter which kind of form optical module, all need light to carry out repeated reflection in it, can cause the loss of light energy in the reflection of light in-process.
Content of application
For solving above-mentioned technical problem, this application provides an optical module and augmented reality glasses to improve the light energy utilization ratio of the display screen in the augmented reality glasses.
In order to achieve the above technical purpose, some embodiments of the present application provide the following technical solutions:
The utility model provides an optical module is applied to augmented reality glasses, augmented reality glasses include the display screen, optical module includes: the curved lens and the planar lens are oppositely arranged; wherein,
the surface of one side of the plane lens is provided with a first polarization light splitting film, and the surface of one side of the curved lens is provided with a second polarization light splitting film;
Emergent light from the display screen is reflected by the plane lens with the first polarization light splitting film and the curved lens with the second polarization light splitting film in sequence and transmitted by the plane lens with the first polarization light splitting film to form first image information, wherein the emergent light is polarized light;
External light sequentially penetrates through the curved lens with the second polarization light splitting film and the plane lens with the first polarization light splitting film to form second image information;
the first image information and the second image information form mixed image information.
Optionally, the polarized light is elliptically polarized light, and the polarization direction of the elliptically polarized light includes a first polarization direction and a second polarization direction.
Optionally, a difference between the polarization direction of the first polarization splitting film and the first polarization direction of the elliptically polarized light is smaller than a preset threshold.
Optionally, the first polarization splitting film is configured to transmit the polarized light in the first polarization direction and reflect the polarized light in the second polarization direction.
Optionally, the polarization direction of the second polarization splitting film and the polarization direction of the first polarization splitting film form a first preset angle, and the value range of the first preset angle is 45 ° ± 5 °, inclusive.
Optionally, the first polarization direction is an S direction, and the second polarization direction is a P direction.
optionally, the polarized light is linearly polarized light, the first polarization beam splitting film is configured to enable the planar lens to at least transmit 50% of the polarized light and reflect the remaining polarized light to form reflected light, and the second polarization beam splitting film is configured to at least reflect 50% of the reflected light.
Optionally, the planar lens and the display screen are arranged at a second preset angle; the second predetermined angle has a value in the range of 45 ° ± 5 °, inclusive.
Optionally, the curved lens has a first arc surface and a second arc surface, the first arc surface and the second arc surface are both concave to the planar lens, the second arc surface is provided with the second polarization beam splitting film, and external light sequentially penetrates through the first arc surface and the second arc surface to reach the planar lens.
Optionally, the radius of curvature of the first arc surface and the radius of curvature of the second arc surface satisfy a preset formula;
The preset formula is as follows: | R1-R2| ≦ sigma, wherein R1represents the radius of curvature, R, of the first cambered surface2and the curvature radius of the second cambered surface is represented, and sigma represents a preset error.
optionally, the optical film assembly further includes a half-wave plate, the half-wave plate is disposed on a light path from the outgoing light from the display screen to the first polarization splitting film, and the outgoing light passes through the half-wave plate and then reaches the planar lens having the first polarization splitting film.
optionally, the method further includes: an antireflection film;
The antireflection film is arranged on the surface of one side of the plane lens, which deviates from the curved lens.
some embodiments of the present application also provide augmented reality glasses, including: the head-mounted equipment main body is used for fixing the augmented reality glasses at a preset position on the head of a user; the head-mounted equipment main body is provided with a fixing device for placing a display screen;
A first lens module and a second lens module disposed on the head-mounted device body, the first lens module and the second lens module each including an optical module as described in any of the above;
when the augmented reality image is displayed, the display screen is divided into two display areas to carry out split screen display, and the two display areas display a first image; the emergent light rays emitted from one display area are used for being incident to the optical module of the first lens module, and the emergent light rays emitted from the other display area are used for being incident to the optical module of the second lens module.
Some embodiments of the present application provide an optical module and augmented reality glasses, wherein the optical module includes a curved lens, a planar lens, and polarization beam splitting films respectively located on the surfaces of the planar lens and the curved lens, and in an actual application process, an emergent light of a display screen forms first image information by passing through the first polarization beam splitting film and the planar lens after being reflected by the first polarization beam splitting film and the second polarization beam splitting film; the external light sequentially penetrates through the curved lens, the second polarization beam splitting film, the first polarization beam splitting film and the plane lens to form second image information, and when the optical module is used for augmented reality display, the first image information and the second image information form mixed image information; therefore, the optical module can realize the augmented reality image display only by utilizing the curved lens and the planar lens.
In some embodiments of the present application, the planar lens may reflect and utilize polarized light having a polarization direction with a larger energy content in the emergent light of the display screen through the first polarization splitting film, so as to increase a light energy utilization rate of the emergent light of the display screen.
drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical module according to some embodiments of the present disclosure;
FIG. 2 is a schematic illustration of the polarization state of elliptically polarized light emitted by a display screen provided by some embodiments of the present application;
FIG. 3(a) is a schematic illustration of the polarization direction of a first polarization splitting film provided by some embodiments of the present application;
FIG. 3(b) is a schematic illustration of the polarization direction of a second polarization splitting film provided by some embodiments of the present application;
FIG. 4 is a schematic diagram of an optical path of an outgoing light ray of a display screen provided by some embodiments of the present application;
Fig. 5 is a schematic structural diagram of an optical module according to some embodiments of the present disclosure;
FIG. 6 is a schematic diagram illustrating a design of an optical module according to some embodiments of the present disclosure;
Fig. 7 is a schematic structural diagram of augmented reality glasses according to some embodiments of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Some embodiments of the present application provide an optical module, as shown in fig. 1, be applied to augmented reality glasses, augmented reality glasses include display screen a10, the optical module includes: a curved lens 200 and a flat lens 100 disposed opposite to each other; wherein,
the first polarization splitting film 110 is arranged on one side surface of the planar lens 100, and the second polarization splitting film 210 is arranged on one side surface of the curved lens 200;
the emergent light from the display screen A10 is reflected by the plane lens 100 with the first polarization beam splitting film 110 and the curved lens 200 with the second polarization beam splitting film 210 in sequence and is transmitted by the plane lens 100 with the first polarization beam splitting film 110 to form first image information, wherein the emergent light from the display screen A10 is polarized light;
The external light sequentially penetrates through the curved lens 200 with the second polarization beam splitting film 210 and the planar lens 100 with the first polarization beam splitting film 110 to form second image information;
The first image information and the second image information form mixed image information.
It should be noted that the display screen a10 displays a first image, and emergent light rays of the display screen a10 carrying first image information pass through the optical module and then meet in human eyes, so as to form the first image information; similarly, external light rays carrying second image information are converged in human eyes after passing through the optical module, so that the second image information is formed; the first image information and the second image information form mixed image information in human eyes when an augmented reality image is displayed. In some embodiments of the present application, the optical module can realize the augmented reality image display by only using a curved lens 200 and a planar lens 100.
the first polarization splitting film 110 is configured to transmit a polarized light component of the polarized light parallel to the polarization direction of the first polarization splitting film 110 and reflect a polarized light component of the polarized light perpendicular to the polarization direction of the first polarization splitting film 110, wherein the light reflected by the first polarization splitting film 110 is reflected by the curved lens 200 having the second polarization splitting film 210 and transmitted by the planar lens 100 having the first polarization splitting film 110, and enters the human eye to form the first image information; in practical applications, the polarization direction of the first polarization splitting film 110 may be set to be perpendicular to the polarization direction of the polarized light with a larger amount of energy in the polarized light, so as to reflect and utilize the polarized light with a larger amount of energy in the polarized light, and increase the light energy utilization rate of the emergent light of the display screen a 10.
in some embodiments of the present application, referring to fig. 2, the polarized light is elliptically polarized light, and the polarization directions of the elliptically polarized light include a first polarization direction and a second polarization direction.
Fig. 2 is a schematic diagram of the polarization state of elliptically polarized light emitted from the display panel a10, in which a coordinate system O-XYZ is established with the short side direction of the display panel a10 as the horizontal axis (X), the long side direction as the vertical axis (Y), and the direction perpendicular to the display panel a10 as the Z axis.
If the second polarization direction is defined as the polarization direction of polarized light with larger energy in the elliptically polarized light emitted by the display screen A10; defining the polarized light in the first polarization direction as the polarization direction of the polarized light with the minimum energy ratio in the elliptically polarized light emitted from the display screen A10; then, the difference between the polarization direction of the first polarization splitting film and the first polarization direction of the elliptically polarized light is smaller than a preset threshold value, so that when the light emitted from the display screen a10 reaches the first polarization splitting film 110 for the first time, the polarized light with the larger energy content in the elliptically polarized light is reflected by the first polarization splitting film 110, and the purpose of improving the light energy utilization rate of the light emitted from the display screen a10 is achieved.
Generally, of the elliptically polarized light emitted from the display panel a10, the P-direction polarized light has the highest energy ratio (generally more than 80%) and the S-direction polarized light has the lowest energy ratio. Therefore, in a specific embodiment of the present application, the first polarization direction is S direction, and the second polarization direction is P direction. Still referring to fig. 2, reference numeral P denotes a P-direction polarization direction, S denotes an S-direction polarization direction, the P-direction polarization direction is located in a plane composed of incident light, reflected light, refracted light, and a normal line, and the S-direction polarization direction is located in a plane perpendicular to the plane composed of incident light, reflected light, refracted light, and the normal line. In the mainstream mobile phone screen, the emergent light rays are all elliptically polarized light, so in an embodiment of the present application, the mobile phone screen can be used as the display screen a10 in the augmented reality glasses.
In some embodiments of the present application, the preset threshold ranges from 0 ° to 5 °, inclusive.
it should be noted that, the smaller the value of the preset threshold, the higher the energy ratio of the reflected part of the outgoing light of the display screen a10 by the first polarization splitting film 110 is, that is, the higher the energy ratio of the light finally forming the first image information in human eyes is. Therefore, the value of the preset threshold is 0 °, so that the first polarization splitting film is used for totally transmitting the polarized light in the first polarization direction and reflecting the polarized light in the second polarization direction. However, in other embodiments of the present application, the value of the preset threshold may also be 1 °, 2 °, 3 °, and the like. The specific value of the preset threshold is not limited, and is specifically determined according to the process level and the equipment requirement.
In some embodiments of the present application, the polarization direction of the second polarization splitting film 210 and the polarization direction of the first polarization splitting film 110 form a first preset angle, and the value range of the first preset angle is 45 ° ± 5 °, inclusive.
the polarization directions of the first and second polarization splitting films 110 and 210 and the polarization state of the display screen a10 refer to fig. 3(a), 3(b) and 2, respectively; as can be seen from fig. 3(a), 3(b) and 2, when the P-direction polarization direction of the display panel a10 makes an angle of 45 ° with the horizontal axis direction, referring to fig. 3(a), the polarization direction of the first polarization splitting film 110 is almost parallel to the S-direction polarization direction of the display panel a10 (the difference between the polarization direction of the first polarization splitting film 110 and the S-direction polarization direction of the display panel a10 is smaller than a preset threshold value), so as to realize the functions of transmitting S-direction polarized light and reflecting P-direction polarized light; referring to fig. 3(b), the polarization direction of the second polarization splitting film 210 makes a first preset angle with the polarization direction of the first polarization splitting film 110.
In some embodiments, the light path of the outgoing light of the display panel a10 is as shown in fig. 4, the P-polarized light in the outgoing light of the display panel a10 is reflected by the first polarization splitting film 110 to reach the surface of the second polarization splitting film 210, and since the polarization direction of the second polarization splitting film 210 and the polarization direction of the first polarization splitting film 110 form a first preset angle, the reflected P-polarized light becomes a reflected light having a light energy ratio of the P-polarized light to the S-polarized light of about 50% after being reflected by the second polarization splitting film 210, and the S-polarized light of the reflected light forms the first image information after passing through the first polarization splitting film 110 and entering human eyes. Because in the emergent ray of display screen A10, P accounts for more than 80% of emergent ray total energy to the energy of polarized light, makes to P make to the make full use of polarized light the optical module can promote the energy utilization of the emergent ray of display screen A10, has reduced the probability that the mixed image information display effect that appears because external light is too strong and cause is not good problem.
in some embodiments of the application, when the light ray that display screen a10 goes out is the linear polarization light, that is to say when polarized light is the linear polarization light, first polarization beam splitting film 110 is used for making planar lens 100 at least see through 50% of polarized light to reflection residual polarized light forms the reverberation, second polarization beam splitting film 210 is used for at least reflecting 50% of reverberation, can realize utilizing equally optical module realizes augmented reality image display's function.
In some embodiments of the present application, and with reference to fig. 1 as well, the planar lens 100 is disposed at a second predetermined angle with respect to the display screen a 10; the second predetermined angle has a value in the range of 45 ° ± 5 °, inclusive.
in some embodiments of the present application, the first predetermined angle is 45 °.
in this embodiment, when the value of the preset threshold is 0 °, the value of the first preset angle is 45 °, which can ensure that the P-direction polarized light reflected by the first polarization splitting film 110 becomes a reflected light with a P-direction polarized light and S-direction polarized light energy ratio of 50% after being reflected by the second polarization splitting film 210, so as to further improve the energy utilization rate of the emergent light of the display screen a 10.
It should be noted that the second preset angle can ensure that the first polarization splitting film 110 on the surface of the planar lens 100 can reflect the emergent light of the display screen a10 to the curved lens 200. In an embodiment of the application, the second predetermined angle is in the range of 45 ° ± 5 °, inclusive. In an embodiment of the present application, the second preset angle is preferably 45 °. However, in other embodiments of the present application, the second preset angle may also be 44 °, 43 °, 46 °, or 47 °. The specific value of the second preset angle is not limited, and is determined according to the actual situation.
In some embodiments of the present application, still taking fig. 1 as an example, the curved lens 200 has a first arc surface and a second arc surface, the first arc surface and the second arc surface are both concave toward the planar lens 100, the second arc surface is provided with the second polarization light splitting film 210, and the external light sequentially penetrates through the first arc surface and the second arc surface to reach the planar lens 100.
The optical axis of the curved lens 200 is parallel to the reference plane P1, the display screen A10 is parallel to the reference plane P1, and therefore, the angle formed by the planar lens 100 and the reference plane P1 is also a second predetermined angle.
In this embodiment, as mentioned above, the optical module has two optical paths, which are the outgoing light path of the display screen a10 and the external light path; wherein, display screen A10 emergent ray light path does: a first polarizing beam splitting film 110, a second polarizing beam splitting film 210, a first polarizing beam splitting film 110, a planar lens 100, human eyes; the external light path is as follows: the curved lens 200, the second polarization splitting film 210, the first polarization splitting film 110, the planar lens 100, and the human eye.
in some embodiments of the present application, a radius of curvature of the first arc surface and a radius of curvature of the second arc surface satisfy a preset formula;
The preset formula is as follows: | R1-R2| ≦ sigma, wherein R1Represents the radius of curvature, R, of the first cambered surface2And expressing the curvature radius of the second cambered surface, wherein sigma expresses a preset error, and sigma is more than or equal to 0mm and less than or equal to 3 mm.
the curvature radii of the first arc surface and the second arc surface only need to satisfy the requirements of reflecting P-direction polarized light and transmitting external light, the smaller the difference between the curvature radii of the first arc surface and the second arc surface is, the simpler the manufacturing process of the curved lens 200 is, and the more preferable the curvature radius of the first arc surface is equal to the curvature radius of the second arc surface, and the more preferable the first arc surface and the second arc surface are both parts of a spherical surface. Meanwhile, the curved lens 200 may be made of a transparent plastic material to facilitate molding of the curved lens 200.
in some embodiments of the present application, the optical film set further includes a half-wave plate disposed on an optical path of an outgoing light ray from the display screen a10 to the first polarization splitting film 110, and the outgoing light ray passes through the half-wave plate and then reaches the planar lens 100 having the first polarization splitting film 110.
It should be noted that, as described above, different mobile phone screens may be used as the display screen a10, but due to the different sizes of the mobile phone screens of different models and brands, the applicability of the optical module to the mobile phone screens of certain sizes may be poor, and therefore in some embodiments of the present application, the half-wave plate is disposed to enable the emergent light of the display screen a10 to have a certain phase difference after passing through the half-wave plate, so that the optical module may be well adapted to the display screens a10 of different sizes, and the universality of the optical module is increased.
In some embodiments of the present application, as shown in fig. 5, the optical module further includes: an antireflection film 120;
The antireflection film 120 is disposed on a surface of the planar lens 100 facing away from the curved lens 200.
The antireflection film 120 is disposed on the surface of the planar lens 100 on the side away from the curved lens 200, so as to reduce the reflected light from the surface of the planar lens 100 on the side facing the human eye, thereby avoiding the situation that the surface of the planar lens 100 on the side facing the human eye generates strong reflection to bring adverse effects to the user experience.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating a design principle of the optical module according to some embodiments of the present application, and reference numeral 300 in fig. 6 denotes a human eye; the planar lens 100 has an angle β of 45 ° with the reference plane P1. The optical axis of the curved lens 200 is parallel to the reference plane P1, and in fig. 6, the optical axis of the curved lens 200 is located in the reference plane P1. In this way, the fixed mounting of the relative positions of the curved lens 200 and the planar lens 100 is facilitated.
When augmented reality display is carried out, the relative position of the display screen A10 and the optical module is fixed, and the display screen A10 is parallel to the reference plane P1. In the three-dimensional rectangular coordinate system O-XYZ, the reference plane P1 is parallel to the XY plane, and the Z-axis is the forward direction of the plane lens 100 pointing to the display screen a 10.
the length of the display panel a10 is set to L, i.e., the length of the display panel a10 in the Y-axis direction. The Y-axis is perpendicular to the optical axis of the curved lens 200. Setting the single-eye field angle as alpha; the distance d from the intersection point of the optical axis of the curved lens 200 and the first polarization beam splitting film 110 to the display screen A103The distance from the intersection point to the first cambered surface (the surface of the curved lens 200 facing away from the plane lens 100) is d2. Setting the distance d from the surface of the side of the plane lens 100 departing from the curved lens 200 to the human eye 3001。
The monocular angle of view α is a known parameter and can be set as desired. If α can be set to 45 °. L, alpha, d3And d2Formula (1) is satisfied, and formula (1) is:
setting the effective focal length of the optical module to be EFL, the effective focal length is EFL as shown in formula (2), and the formula (2) is:
EFL＝d3+d2 (2)
The relative position relationship of the curved lens 200, the planar lens 100 and the display screen a10 is arranged based on the above formula (1) and the formula (2), which facilitates the layout of the relative position relationship of the three.
It should be noted that, the two sides of the equation (1) and the equation (2) are not absolutely equal, and a certain error is allowed, that is, the equation (1) can be expressed by equation (3), and the equation (2) can be expressed by equation (4). Wherein, the formula (3) and the formula (4) are respectively:
EFL≈d3+d2 (4)
when the length of the display screen A10 is 104mm, the length of the monocular display area is 52 mm. Define the monocular angle of view α as 45 °, d1＝52mm，d2＝30mm，d332 mm. The EFL can be calculated to be 62 mm. The size of the curved lens 200 is 64mm × 46mm × 2mm, that is, the length of the curved lens 200 on the Y axis is 64mm, the width on the Z axis is 46mm, and the thickness on the X axis is 2 mm; the size of the planar lens 100 is 64mm × 63mm × 2mm, that is, the length of the planar lens 100 in the Y axis is 64mm, the width in the Z axis is 63mm, and the thickness in the X axis is 2 mm. And the curvature radius of the first cambered surface and the curvature radius of the second cambered surface are both 124 mm.
Accordingly, some embodiments of the present application further provide augmented reality glasses, as shown in fig. 7, including: a head-mounted device body a21, wherein the head-mounted device body a21 is configured to fix the augmented reality glasses at a preset position on the head of a user; the head-mounted equipment body is provided with a fixing device A24 for placing a display screen A10;
a first lens module a22 and a second lens module a23 disposed on the head-mounted device body, the first lens module a22 and the second lens module a23 each comprising an optical module as described in any of the above embodiments;
When the augmented reality image is displayed, the display screen A10 is divided into two display areas for split screen display, and the two display areas both display a first image; the emergent light rays emitted from one display area are used for being incident to the optical module of the first lens module A22, and the emergent light rays emitted from the other display area are used for being incident to the optical module of the second lens module A23.
As described in the above embodiments, the curved lenses 200 of the two optical modules are perpendicular to a reference surface, the optical axis of the curved lens 200 is parallel to the reference surface, and the display screen a10 is parallel to the reference surface and disposed toward the optical axis, so as to facilitate the installation and fixation of the relative positions of the components.
Fig. 6 is a cross-sectional view of the first lens module a22 in fig. 7, and reference is made to fig. 6 for a relative position relationship among the curved lens 200, the flat lens 100 and the display screen a10 in the optical module of the first lens module a22 in the cross-sectional view, which is not repeated herein.
In summary, some embodiments of the present disclosure provide an optical module and enhanced display glasses, wherein the optical module includes a curved lens 200 and a planar lens 100, and in a practical application process, an emergent light of a display screen a10 is reflected by the first polarization beam splitting film 110 and the second polarization beam splitting film 210, and then passes through the first polarization beam splitting film 110 and the planar lens 100 to form first image information; the external light sequentially penetrates through the curved lens 200, the second polarization beam splitting film 210, the first polarization beam splitting film 110 and the planar lens 100 to form second image information, and when the optical module is used for augmented reality display, the first image information and the second image information form mixed image information; as can be seen, the optical module can realize the augmented reality image display only by using a curved lens 200 and a planar lens 100.
in some embodiments of the present application, the planar lens 100 can reflect and utilize polarized light with a polarization direction having a larger energy content in the outgoing light of the display screen through the first polarization splitting film 110, so as to increase the light energy utilization rate of the outgoing light of the display screen a 10.
the previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An optical module is applied to augmented reality glasses; its characterized in that, augmented reality glasses include the display screen, the optical module includes: the curved lens and the planar lens are oppositely arranged; wherein,
the surface of one side of the plane lens is provided with a first polarization light splitting film, and the surface of one side of the curved lens is provided with a second polarization light splitting film;
Emergent light from the display screen is reflected by the plane lens with the first polarization light splitting film and the curved lens with the second polarization light splitting film in sequence and transmitted by the plane lens with the first polarization light splitting film to form first image information, wherein the emergent light is polarized light;
External light sequentially penetrates through the curved lens with the second polarization light splitting film and the plane lens with the first polarization light splitting film to form second image information;
the first image information and the second image information form mixed image information;
The polarization direction of the second polarization light splitting film and the polarization direction of the first polarization light splitting film form a first preset angle, and the value range of the first preset angle is 45 degrees +/-5 degrees, including end points;
The curved lens is provided with a first arc surface and a second arc surface, the first arc surface and the second arc surface are both concave to the planar lens, the surface of the second arc surface is provided with the second polarization light splitting film, and external light sequentially penetrates through the first arc surface and the second arc surface to reach the planar lens;
The curvature radius of the first cambered surface and the curvature radius of the second cambered surface meet a preset formula;
the preset formula is as follows: | R1-R2| ≦ sigma, wherein R1Represents the radius of curvature, R, of the first cambered surface2And expressing the curvature radius of the second cambered surface, wherein sigma expresses a preset error, and sigma is more than or equal to 0mm and less than or equal to 3 mm.
2. the optical module of claim 1, wherein the polarized light is elliptically polarized light, and the polarization direction of the elliptically polarized light comprises a first polarization direction and a second polarization direction.
3. The optical module of claim 2, wherein a difference between the polarization direction of the first polarization splitting film and the first polarization direction of the elliptically polarized light is less than a predetermined threshold.
4. The optical module of claim 3, wherein the first polarization splitting film is configured to transmit polarized light of the first polarization direction and reflect polarized light of the second polarization direction.
5. The optical module of claim 2 wherein the first polarization direction is S-direction and the second polarization direction is P-direction.
6. The optical module of claim 1 wherein the polarized light is linearly polarized light, the first polarization splitting film is configured to transmit at least 50% of the polarized light through the planar lens and reflect the remaining polarized light to form reflected light, and the second polarization splitting film is configured to reflect at least 50% of the reflected light.
7. The optical module of claim 1, wherein the planar lens is disposed at a second predetermined angle with respect to the display screen; the second predetermined angle has a value in the range of 45 ° ± 5 °, inclusive.
8. The optical module of claim 1 further comprising a half-wave plate disposed in the optical path of the outgoing light from the display screen to the first polarization splitting film, the outgoing light passing through the half-wave plate before reaching the planar lens with the first polarization splitting film.
9. The optical module of claim 1 further comprising: an antireflection film;
The antireflection film is arranged on the surface of one side of the plane lens, which deviates from the curved lens.
10. An augmented reality glasses, comprising: the head-mounted equipment main body is used for fixing the augmented reality glasses at a preset position on the head of a user; the head-mounted equipment main body is provided with a fixing device for placing a display screen;
A first lens module and a second lens module disposed on the head-mounted device body, the first lens module and the second lens module each comprising the optical module of any of claims 1-9;
when the augmented reality image is displayed, the display screen is divided into two display areas to carry out split screen display, and the two display areas display a first image; the emergent light rays emitted from one display area are used for being incident to the optical module of the first lens module, and the emergent light rays emitted from the other display area are used for being incident to the optical module of the second lens module.
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| CN201710292660.5A CN107065189B (en) | 2017-04-28 | 2017-04-28 | optical module and augmented reality glasses |
| PCT/CN2017/087687 WO2018196108A1 (en) | 2017-04-28 | 2017-06-09 | Optical module and augmented reality glasses |
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| CN201710292660.5A CN107065189B (en) | 2017-04-28 | 2017-04-28 | optical module and augmented reality glasses |
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| CN109425985B (en) * | 2017-08-30 | 2020-08-28 | 芋头科技（杭州）有限公司 | Near-eye display system and near-eye display |
| CN107450184A (en) * | 2017-09-19 | 2017-12-08 | 歌尔科技有限公司 | A kind of AR display devices |
| CN109782441A (en) * | 2017-11-14 | 2019-05-21 | 塔普翊海（上海）智能科技有限公司 | A kind of aobvious optical system of the see-through head of nearly eye |
| CN108333773A (en) * | 2018-04-13 | 2018-07-27 | 深圳鸿鑫晶光电有限公司 | AR head-mounted display apparatus |
| CN108398792B (en) * | 2018-04-20 | 2023-10-03 | 深圳创维新世界科技有限公司 | Augmented reality display optical module and system |
| CN111474715A (en) * | 2020-04-23 | 2020-07-31 | 歌尔股份有限公司 | Optical system and augmented reality device |
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