CN114236855A - Optical system and AR apparatus - Google Patents
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- CN114236855A CN114236855A CN202210133625.XA CN202210133625A CN114236855A CN 114236855 A CN114236855 A CN 114236855A CN 202210133625 A CN202210133625 A CN 202210133625A CN 114236855 A CN114236855 A CN 114236855A
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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
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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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
- G02B2027/0178—Eyeglass type
Abstract
The application discloses optical system and AR equipment, this optical system includes: the display module is used for emitting a first light beam containing a virtual image; the optical module comprises a circular polarizing film and a semi-transparent semi-reflecting mirror, the circular polarizing film is a cholesteric liquid crystal polymer circular polarizing film, the circular polarizing film is obliquely arranged relative to the propagation direction of the first light beam and is positioned on the light emitting side of the display module, and the circular polarizing film is used for transmitting light with a first rotation direction in the light emitted to the circular polarizing film and reflecting light with a second rotation direction in the light emitted to the circular polarizing film; the transflective mirror is disposed on a reflective side of the circular polarizing plate, and reflects a part of light emitted thereto and transmits the other part. The problem that the existing AR glasses are relatively high in cost and not beneficial to popularization of the AR glasses is solved.
Description
Technical Field
The present application relates to the field of optical device technology, and in particular, to an optical system and an AR apparatus.
Background
With the progress of scientific technology, more and more professional products such as AR glasses generated based on AR (Augmented Reality) technology gradually enter daily life. In current AR glasses, the polarization states of virtual image light and ambient light are usually changed by using a linear polarizer and a quarter-wave plate, so that both the ambient light and the virtual image light respectively incident from different directions of the glasses can be transmitted to the eyes of a user, and the user can "see" a composite image in which virtual images are superimposed in the environment. However, the reflective linear polarizer is relatively expensive, which is disadvantageous for the popularization of AR glasses.
Disclosure of Invention
The application discloses optical system and AR equipment to the cost of solving present AR glasses is higher relatively, is unfavorable for the problem that AR glasses are popularized.
In order to solve the above problems, the following technical solutions are adopted in the present application:
in a first aspect, an embodiment of the present application discloses an optical system, which is applied to an AR device, and includes:
the display module is used for emitting a first light beam containing a virtual image;
the optical module comprises a circular polarizing film and a semi-transparent semi-reflecting mirror, the circular polarizing film is a cholesteric liquid crystal polymer circular polarizing film, the circular polarizing film is obliquely arranged relative to the propagation direction of the first light beam and is positioned on the light emitting side of the display module, and the circular polarizing film is used for transmitting light with a first rotation direction in the light emitted to the circular polarizing film and reflecting light with a second rotation direction in the light emitted to the circular polarizing film; the transflective mirror is disposed on a reflective side of the circular polarizing plate, and reflects a part of light emitted thereto and transmits the other part.
In a second aspect, an embodiment of the present application discloses an AR device including the optical system of the first aspect.
The technical scheme adopted by the application can achieve the following beneficial effects:
the embodiment of the application discloses optical system, optical system includes display module assembly and optical module assembly, and wherein, display module assembly can the emergent first light beam that contains virtual image, and optical module assembly can handle the light outside first light beam and optical system. The first light beam can be transmitted and reflected at the circular polarizing film, the rotating directions of the transmitted light and the reflected light are different, and the reflected light can be reflected again at the semi-transparent half-reflecting mirror to form light with the rotating direction capable of penetrating through the circular polarizing film; meanwhile, light rays outside the optical system can also pass through the semi-transparent and semi-reflective mirror to be incident into the optical system, and are transmitted and reflected at the position of the circular polarizing plate, so that the transmitted light rays and the light rays reflected at the position of the semi-transparent and semi-reflective mirror in the first light beam can be transmitted to one side of the circular polarizing plate, which is deviated from the display module and the semi-transparent and semi-reflective mirror, so that the light rays and the light rays can be incident into eyes of a user together, the optical system disclosed by the embodiment of the application can be ensured to have the capability of enhancing reality, and the light rays can be applied to AR equipment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of an optical system disclosed in an embodiment of the present application;
FIG. 2 is a schematic diagram of another configuration of an optical system disclosed in an embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical system disclosed in an embodiment of the present application.
Description of reference numerals:
100-a display module,
210-circular polarizer, 220-semi-transparent half-reflecting mirror, 230-absorption type linear polarizer, 240-quarter wave plate,
300-protective shell,
400-convergent lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some 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.
Technical solutions disclosed in the embodiments of the present application are described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to fig. 3, the present embodiment discloses an optical system that can be applied to an AR device such as AR glasses, so that virtual image light can be incident to the eyes of a user together with ambient light, and the user can "see" an image in which a virtual image and a real image are superimposed on each other. The optical system includes a display module 100 and an optical module.
The display module 100 is configured to provide a virtual image, and the display module 100 can specifically emit a first light beam, where the first light beam includes a virtual image, that is, light rays that need to be combined to the real image. The display module 100 may be a micro projection device, which has a light emitting capability, and specific parameters of the display module 100 may be selected according to actual requirements, which is not limited herein.
The optical module can provide optical effects for the light rays emitted to the optical module, such as changing the propagation direction and phase of the light rays. The optical module includes a circular polarizer 210 and a transflective mirror 220. The circular polarizer 210 is a cholesteric liquid crystal polymer polarizer, that is, the circular polarizer 210 is formed by cholesteric liquid crystal polymer, and the overall manufacturing cost of the circular polarizer 210 made of the material is relatively low, and the circular polarizer 210 has the capability of processing light. The transflective mirror 220 is an optical device having both transmission and reflection capabilities, but it is not meant to have a transmission/reflection ratio of 1: 1, the transmission/reflection ratio of the half mirror 220 is not limited herein.
The circular polarizer 210 may filter the light, and the light having the opposite rotation direction to the circular polarizer 210 passes through the circular polarizer 210, and the light having the same rotation direction as the circular polarizer 210 is reflected at the circular polarizer 210, that is, the circular polarizer 210 may transmit the light having the first rotation direction and reflect the light having the second rotation direction, of the light emitted thereto, where the first rotation direction and the second rotation direction are opposite to each other, of course. For example, if the rotation direction of the circular polarizer 210 is right-handed, when the first light beam emitted from the display module 100 in the unpolarized state enters the circular polarizer 210, the light beam of the first light beam having the right-handed rotation direction is reflected by the circular polarizer 210, and the light beam of the first light beam having the left-handed rotation direction is transmitted by the circular polarizer 210.
Based on this, the circular polarizer 210 can be utilized to split the first light beam emitted from the display module 100, so that the circular polarizer 210 is disposed in an inclined manner with respect to the propagation direction of the first light beam, and the circular polarizer 210 is located at the light emitting side of the display module 100, thereby ensuring that the first light beam emitted from the display module 100 can be transmitted and reflected from the circular polarizer 210, so that the reflected light beam can be emitted to other directions outside the display module 100, and the reflected light beam can be reflected again at the transflective mirror 220 and finally emitted to the eyes of the user, so that the user can obtain a virtual image.
And, the half mirror 220 is disposed on the reflection side of the circular polarizer 210, the half mirror 220 can reflect a part of the light emitted to it and transmit the other part, so that when the light reflected from the circular polarizer 210 in the first light beam is incident on the half mirror 220, a part of the reflected light can be reflected at the half mirror 220 again, on one hand, the propagation direction of the light is changed, so that the light can be emitted to the circular polarizer 210 again, on the other hand, the rotation direction of the light reflected from the circular polarizer 210 can be changed by using the half mirror 220, so that the light with the first rotation direction can be formed after the light is reflected from the half mirror 220, and the transmission phenomenon occurs at the circular polarizer 210.
Meanwhile, light rays outside the optical system can also enter the optical system through the semi-transparent half-mirror 220, and the incident light rays can also undergo a light splitting process at the position of the circular polarizing plate 210, so that light with a first rotation direction passes through the circular polarizing plate 210 and propagates to the other side of the circular polarizing plate 210 together with light rays in the first light beam reflected by the semi-transparent half-mirror 220, and since the other side of the circular polarizing plate 210 is usually the side where a user is located, the light rays outside the optical system can enter eyes of the user together with light rays emitted by the display module 100, so that the user can 'see' a virtual image and a composite image formed by overlapping an environment real image outside the optical system.
Based on the above, in a specific assembling process, the emitting direction of the display module 100 may be perpendicular to the incident direction of the environmental image, and meanwhile, the angles of the circular polarizer 210 with respect to the emitting direction and the incident direction may be 45 °, in this case, the propagation path of the light is convenient to adjust, the distortion of the light in the propagation process may be reduced as much as possible, and the imaging definition is improved. In order to further improve the imaging definition, the transflective mirror 220 may be specifically an arc-shaped structural member, so as to provide a converging and converging effect for the light by using the transflective mirror 220, enlarge the angle of the light which can be collected by the optical system, increase the imaging angle and the imaging range of the optical system, and improve the overall performance of the optical system. In addition, the circular polarizer 210 may be a planar structural member, that is, a flat plate structural member as a whole, which may further reduce the manufacturing cost of the circular polarizer 210.
The embodiment of the application discloses an optical system, optical system includes display module 100 and optical module, and wherein, display module 100 can be emergent and include the first light beam of virtual image, and optical module can handle the light outside first light beam and the optical system. The first light beam can be transmitted and reflected at the circular polarizer 210, the rotational directions of the transmitted light beam and the reflected light beam are different, and the reflected light beam can be reflected again at the semi-transparent half mirror 220 to form a light beam with the rotational direction capable of passing through the circular polarizer 210; meanwhile, light rays outside the optical system can also pass through the semi-transparent and semi-reflective mirror 220 to be incident into the optical system, and are transmitted and reflected at the circular polarizing plate 210, so that the transmitted light rays and the light rays reflected at the semi-transparent and semi-reflective mirror 220 in the first light beam can be transmitted to one side of the circular polarizing plate 210 departing from the display module 100 and the semi-transparent and semi-reflective mirror 220 together, and the capability of being incident into eyes of a user together is achieved, and the optical system disclosed by the embodiment of the application can be ensured to have the capability of enhancing reality and can be applied to AR equipment.
Meanwhile, the circularly polarizing plate 210 in the optical system disclosed in the embodiment of the present application is the cholesteric liquid crystal polymer circularly polarizing plate 210, and the overall manufacturing cost is relatively low, so that the overall cost of the optical system is also relatively low, thereby being beneficial to reducing the difficulty in popularizing the AR device. In the process of providing the circular polarizer 210, it is necessary to make the reflection wavelength band of the circular polarizer 210 a wide wavelength band, at least covering the wavelength range of visible light. Also, the circular polarizer 210 may be formed in such a manner that a plurality of narrow wavelength band polymer layers are stacked on one another; alternatively, a single layer broadband film layer may be constructed using a method of making a concentration gradient of polymerized monomers to form the circular polarizer 210 described above.
In the above embodiment, when the light of the first light beam with the second rotation direction is directed to the transflective mirror 220, a part of the light can pass through the transflective mirror 220 and be directed to the side of the transflective mirror 220 away from the circular polarizer 210; meanwhile, when light rays other than the optical system are emitted to the half mirror 220, in addition to a part of the light rays being able to pass through the half mirror 220, another part of the light rays other than the optical system emitted to the half mirror 220 are reflected at the half mirror 220, and is directed to the side of the transflective mirror 220 facing away from the circular polarizer 210, which results in a relatively high reflectivity of the outside of the transflective mirror 220 (i.e., the side facing away from the circular polarizer 210) in the optical system, and consequently, the relatively weak light reflected at the user's eyes is difficult to observe by others outside the AR device, resulting in the other people outside the AR device being substantially unable to "see" the user's eyes of the AR device, adversely affecting the user-to-user relationship, and the user can carry out eye-to-eye interaction with other surrounding human bodies or animal bodies, which brings great inconvenience to the user.
Based on the above situation, further, as shown in fig. 2, in the optical system disclosed in the embodiment of the present application, the optical module may further include an absorption-type linear polarizer 230 and a quarter-wave plate 240. An absorbing line polarizer 230 is disposed on the side of the transflective mirror 220 facing away from the circular polarizer 210, and a quarter wave plate 240 is disposed between the absorbing line polarizer 230 and the circular polarizer 210. That is, the quarter-wave plate 240 and the absorption-type linear polarizer 230 are both located on the side of the transflective mirror 220 away from the circular polarizer 210, so that the light reflected (or transmitted) from the transflective mirror 220 is absorbed by the absorption-type linear polarizer 230, and the light in the optical system is prevented from leaking. In order to make the matching relationship between the components in the optical system more accurate, the quarter-wave plate 240 and the absorption-type line polarizer 230 may also be arc-shaped structures, and the specific structural parameters of the quarter-wave plate 240 and the absorption-type line polarizer may be the same as those of the half-transparent mirror 220, so that the matching accuracy between the quarter-wave plate, the absorption-type line polarizer and the half-transparent mirror is relatively higher, and the assembly difficulty is reduced.
The absorbing type linear polarizer 230 is capable of transmitting light directed toward it in a first linear direction and absorbing light directed in a second linear direction, the first linear direction and the second linear direction being opposite. In detail, the absorption-type linear polarizer 230 can process the unpolarized light beam to change the unpolarized light beam into a linearly polarized light beam, and the parameters of the absorption-type linear polarizer 230 are set, so that the light beam in a specific linear direction in the light beam can pass through the absorption-type linear polarizer 230, and the light beams in other linear directions cannot pass through the absorption-type linear polarizer 230 and are blocked by the absorption-type linear polarizer 230, and thus cannot enter the optical system, and the corresponding light beams in the optical system cannot be emitted from the optical system.
Meanwhile, the quarter-wave plate 240 can switch light between a linear polarization state and a circular polarization state, that is, light in the linear polarization state can be changed into the circular polarization state after passing through the quarter-wave plate 240, and light in the circular polarization state can be changed into the linear polarization state after passing through the quarter-wave plate 240. Moreover, by adjusting the parameters of the quarter-wave plate 240, it can be ensured that the light ray outside the optical system and passing through the absorption-type linear polarizer 230 can pass through the circular polarizer 210 after passing through the quarter-wave plate 240, that is, the light ray outside the optical system after being processed by the absorption-type linear polarizer 230 and the quarter-wave plate 240 is in a circular polarization state, and the rotation direction is the first rotation direction; accordingly, the quarter-wave plate 240 can also process the light rays of the first light beam emitted from the display module 100 after passing through the transflective mirror 220, so that the linear direction of the light rays is the second direction, and the light rays are blocked and absorbed by the absorption-type line polarizer 230, thereby preventing the light rays in the optical system from being emitted out of the optical system.
Therefore, when the optical system disclosed by the technical scheme is adopted, the problem that the reflectivity is high on the outer side of the optical system can be prevented, the eyes of a user of the optical system can be ensured to be seen by other people or users, and the interaction capacity of the optical system is improved. In addition, under the condition that the technical scheme is adopted, because the light emitted by the display module 100 cannot leak out of the optical system, the privacy of a user can be protected, and the safety and reliability degree of the optical system is improved.
In addition, in the process of adopting the above technical solution, the absorption-type linear polarizer 230 and the quarter-wave plate 240 function to prevent light rays in the optical system (including light rays emitted from the display module 100 in the optical system and light rays incident into the optical system from outside the optical system) from leaking out of the optical system. In the conventional AR device, the reflective type polarizer and the quarter-wave plate 240 are further required to process the outgoing light of the display module 100 and the incident light outside the optical system, so that the technical solution disclosed in this embodiment still has the advantage of low cost compared with the conventional AR device, and the optical system has relatively few components, which is convenient for assembly.
In the case that the optical module includes the absorption type line polarizer 230 and the quarter-wave plate 240, in another embodiment of the present application, optionally, as shown in fig. 3, the quarter-wave plate 240 may be disposed on the light-emitting side of the display module 100, and the absorption type line polarizer 230 may be disposed between the quarter-wave plate 240 and the display module 100, that is, the quarter-wave plate 240 and the absorption type line polarizer 230 are both disposed on the light-emitting side of the display module 100 and are located on the optical path of the first light beam, so that the first light beam emitted from the display module 100 firstly passes through the absorption type line polarizer 230 and then passes through the quarter-wave plate 240 to be incident on the circular polarizer 210. The roles and specific parameters of the quarter-wave plate 240 and the absorbing linear polarizer 230 can be found in the above embodiments, and are not repeated here for brevity.
In the case of this embodiment, by setting the parameters of the absorption-type linear polarizer 230 and the quarter-wave plate 240, after passing through the absorption-type linear polarizer 230 and the quarter-wave plate 240, the first light beam emitted from the display module 100 in the non-polarization state can be converted into a light beam in a circular polarization state with a second rotation direction, and then the light beam can be sequentially reflected on the circular polarizer 210 and the semi-transparent mirror 220, and finally enter the circular polarizer 210 and is transmitted from the circular polarizer 210 to be obtained by the user. In the above technical solution, since the light outside the optical system is only lost at the transflective mirror 220, compared with the technical solution that the light outside the optical system also needs to pass through the absorption-type line polarizer 230 and the quarter-wave plate 240, the technical solution disclosed in the embodiment of the present application can reduce the loss of the ambient light, that is, the light outside the optical system that enters the optical system, and improve the overall definition of the image.
In addition, in this embodiment, the quarter-wave plate 240 and the absorption polarizer may be additionally disposed outside the transflective mirror 220, so that the emitted light in the optical system is absorbed by the quarter-wave plate and the absorption polarizer, thereby preventing the light in the optical system from leaking out, improving the overall performance of the device, and protecting the privacy of the user. However, this again leads to a renewed increase in the cost of the entire optical system.
Based on this, as shown in fig. 3, in the case that the absorption type linear polarizer 230 and the quarter-wave plate 240 are disposed on the light-emitting side of the display module 100, both the absorption type linear polarizer 230 and the quarter-wave plate 240 can be planar sheet-shaped structural members. Compared with the absorption type linear polarizer 230 and the quarter-wave plate 240 with arc structures, the absorption type linear polarizer 230 and the quarter-wave plate 240 with planar sheet structures have relatively lower manufacturing cost and higher precision, so that the overall cost of the optical system can be further reduced, and the imaging precision of the optical system can be improved. Moreover, in the case of adopting the technical solution disclosed in the embodiment of the present application, even if the absorption-type linear polarizer 230 and the quarter-wave plate 240 are disposed on the light-emitting side of the display module 100, the absorption-type linear polarizer 230 and the quarter-wave plate 240 are still additionally disposed on the side of the semi-transparent half-mirror 220 away from the circular polarizer 210, and the overall cost of the optical system can be basically guaranteed to be lower than that of the optical system in the existing AR device.
The light-emitting side of the display module 100 is provided with the absorption type linear polarizer 230 and the quarter-wave plate 240, and the absorption type linear polarizer 230 and the quarter-wave plate 240 are both planar sheet-shaped structural members, so that the absorption type linear polarizer 230 is attached to the light-emitting side of the display module 100, and the quarter-wave plate 240 is attached to the side of the absorption type linear polarizer 230 departing from the display module 100, thereby the matching precision between the display module 100, the absorption type linear polarizer 230 and the quarter-wave plate 240 is higher, the overall parameters of the light after being processed by the three are improved, and the imaging definition of the optical system is further improved.
Alternatively, the transflective mirror 220 disclosed in the embodiments of the present application may have a transmission/reflection ratio of 4:6 to 6: 4. Under the condition of adopting the technical scheme, the first light beam emitted by the display module 100 can be finally transmitted to the intensity of the light ray on the side, away from the display module 100, of the circular polarizing plate 210, and the intensity of the light ray outside the optical system is finally transmitted to the light ray on the side, away from the display module 100, of the circular polarizing plate 210, so that the virtual image and the environment image (namely, the real image) in the composite image finally seen by the user are relatively clear, the definition of one of the virtual image and the real image is far higher than that of the other image, and the actual impression of the user is improved.
Alternatively, in the optical system disclosed in the embodiment of the present application, the circular polarizer 210 and the half-mirror 220 may be fixed to each other by fixing the opposite ends of the circular polarizer 210 or the periphery of the circular polarizer 210 to the housing of the optical system. In another embodiment of the present application, optionally, the optical system disclosed in this embodiment of the present application may further include a supporting substrate, where the supporting substrate is a light-transmitting structure member, and the light transmitted from the circular polarizer 210 can pass through the supporting substrate. Specifically, the supporting substrate can be made of transparent materials such as transparent plastics or acrylic materials and basically does not have the capacity of processing light, the thickness of the supporting substrate can be determined according to actual requirements, and the supporting substrate can be made to be as small as possible on the premise of having good supporting capacity.
Meanwhile, the projection of the circular polarizer 210 in the thickness direction is located on the supporting substrate, that is, the supporting substrate can lift the supporting function at any position on the circular polarizer 210, so that the supporting function of the supporting substrate provided for the circular polarizer 210 is ensured to be comprehensive, and the supported effect of the circular polarizer 210 is improved. More specifically, the circularly polarizing plate 210 may be fixed to a support substrate by means of bonding or the like, and the support substrate and a structure such as a housing of the optical system may be fixed to each other by means of bonding or the like, or the support substrate may be fixed to the housing of the optical system by means of a structural member such as a screw connector.
In addition, in the process of fixing the half mirror 220, the half mirror 220 may be directly fixed to the housing of the optical system by bonding. In another embodiment of the present application, the optical system may further include a protective casing 300, the protective casing 300 may be a part of the housing, and the protective casing 300 may also be made of a light-transmitting material, so as to ensure that light outside the optical system can pass through the protective transparent semi-reflective mirror 220 and enter the optical system. Moreover, the shape of the protective shell 300 and the profile modeling of the half-transparent half-reflecting mirror 220 can be realized, the half-transparent half-reflecting mirror 220 is attached to the protective shell 300, the light transmission capacity is improved, meanwhile, the protective shell 300 can provide support and protection effects for the half-transparent half-reflecting mirror 220, and the service life and the safety of the half-transparent half-reflecting mirror 220 are improved. As described above, the half-mirror 220 of the optical system on the side facing away from the circular polarizer 210 may be further provided with a quarter-wave plate 240 and an absorption-type linear polarizer 230, in which case the absorption-type linear polarizer 230 may be supported on the protective cover 300.
Optionally, an antireflection film is disposed on the incident side of the circular polarizer 210, so as to improve the transmission capability of light from the circular polarizer 210 by using the antireflection film, thereby enhancing the imaging sharpness of the optical system. The antireflection film may be attached to the surface of the incident side of the circularly polarizing plate 210 by vacuum bonding. In addition, as described above, the circular polarizer 210 may be supported on a supporting substrate, and although the supporting substrate is a light-transmitting structural member, the problem of light loss still occurs, and therefore, by disposing an antireflection film on the incident side of the circular polarizer 210, it can be ensured that the light is transmitted to the side of the circular polarizer 210 away from the display module 100, the intensity of the light incident on the eyes of the user is still relatively strong, and the definition of the image "seen" by the user is still relatively high.
Optionally, as shown in fig. 2, the optical system disclosed in the embodiment of the present application may further include a converging lens 400, where the converging lens 400 is disposed on the light exit side of the display module 100 and located between the display module 100 and the optical path of the circular polarizer 210, so as to ensure that the first light beam emitted from the display module 100 can pass through the converging lens 400, and the converging lens 400 can converge the first light beam, so that the imaging quality of the first light beam is higher. Specifically, the converging lens 400 may include a convex lens, and the number of lenses in the converging lens 400 may be one, or the converging lens 400 may include a plurality of lenses forming a lens group to further improve the imaging quality of the first light beam.
In addition, in the case that the absorption type line polarizer 230 and the quarter-wave plate 240 are disposed on the light emitting side of the display module 100, the beam absorbing lens 400 may be disposed on the side of the quarter-wave plate 240 away from the display module 100, so as to prevent the beam absorbing lens 400 from interfering with the normal operation of the absorption type line polarizer 230 and the quarter-wave plate 240.
Based on the optical system disclosed in any of the above embodiments, an AR device is also disclosed in the embodiments of the present application, which includes any of the above optical systems. Of course, the AR device further includes other structural members such as a housing, and for the sake of brevity, these structural members will not be described one by one here. The AR device may specifically be AR glasses, and in this case, the AR device may further include a temple and the like.
In the embodiments of the present application, the difference between the embodiments is described in detail, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An optical system applied to an AR device, the optical system comprising:
the display module is used for emitting a first light beam containing a virtual image;
the optical module comprises a circular polarizing film and a semi-transparent semi-reflecting mirror, the circular polarizing film is a cholesteric liquid crystal polymer circular polarizing film, the circular polarizing film is obliquely arranged relative to the propagation direction of the first light beam and is positioned on the light emitting side of the display module, and the circular polarizing film is used for transmitting light with a first rotation direction in the light emitted to the circular polarizing film and reflecting light with a second rotation direction in the light emitted to the circular polarizing film; the transflective mirror is disposed on a reflective side of the circular polarizing plate, and reflects a part of light emitted thereto and transmits the other part.
2. The optical system according to claim 1, wherein the optical module further comprises a quarter-wave plate and an absorption-type linear polarizer, the absorption-type linear polarizer is disposed on a side of the transflective mirror facing away from the circular polarizer, the quarter-wave plate is disposed between the absorption-type linear polarizer and the transflective mirror, the absorption-type linear polarizer is configured to transmit light with a first linear direction and absorb light with a second linear direction, the first linear direction is opposite to the second linear direction, and the quarter-wave plate is configured to switch light between a linear polarization state and a circular polarization state.
3. The optical system of claim 1, wherein the optical module further comprises a quarter-wave plate and an absorbing type line polarizer, the quarter-wave plate is disposed on the light-emitting side of the display module, the absorbing type line polarizer is disposed between the quarter-wave plate and the display module, the absorbing type line polarizer is configured to change the polarization state of the first light beam to a linear polarization state, and the quarter-wave plate is configured to change the light directed thereto from the linear polarization state to a circular polarization state with a second rotation direction.
4. The optical system of claim 3, wherein the absorbing linear polarizer and the quarter-wave plate are both planar sheet structures.
5. The optical system according to claim 4, wherein the absorption-type linear polarizer is attached to the light-emitting side of the display module, and the quarter-wave plate is attached to a side of the absorption-type linear polarizer away from the display module.
6. The optical system of claim 1 wherein the transflective mirror has a transmission/reflection ratio of between 4:6 and 6: 4.
7. The optical system according to claim 1, further comprising a support substrate, wherein the support substrate is a light-transmitting structural member, the circular polarizer is supported on the support substrate, and a projection of the circular polarizer in a thickness direction of the circular polarizer is located on the support substrate.
8. The optical system according to claim 7, wherein an antireflection film is provided on the incident side of the circularly polarizing plate.
9. The optical system according to claim 1, further comprising a converging lens disposed on the light exit side of the display module and located between the display module and the optical path of the circular polarizer, wherein the converging lens is configured to converge the first light beam.
10. An AR device comprising the optical system of any one of claims 1-9.
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| CN202210133625.XA CN114236855A (en) | 2022-02-14 | 2022-02-14 | Optical system and AR apparatus |
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| CN202210133625.XA CN114236855A (en) | 2022-02-14 | 2022-02-14 | Optical system and AR apparatus |
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| CN115047630A (en) * | 2022-06-30 | 2022-09-13 | 上海摩勤智能技术有限公司 | AR optical system and AR device |
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