CN211979335U - Display optical system and head-mounted display device - Google Patents

Abstract

The application discloses a display optical system, which comprises a display component, a projection optical component and a first optical component, wherein the display component comprises a display, and the display is used for projecting a virtual image along a projection optical path; a projection optical assembly including a projection polarizer for allowing light polarized in the first direction to pass therethrough; the first optical assembly is arranged on the projection light path, the projection optical assembly is arranged between the display assembly and the first optical assembly, the first optical assembly reflects light polarized along a first direction and transmits light polarized along a second direction, and the first direction is perpendicular to the second direction. The application also discloses a head-mounted display device. In the display optical system and the head-mounted display device, when the virtual image reaches the first optical assembly, the virtual image is reflected by the first optical assembly, the virtual image cannot penetrate through the first optical assembly, light cannot irradiate the lower part of eyes of a user, and the use experience of the user can be improved.

Description

Display optical system and head-mounted display device

Technical Field

The present application relates to the field of head-mounted display device technology, and more particularly, to a display optical system and a head-mounted display device.

Background

AR glasses are wearable equipment applying augmented reality technology, and people can see pictures of a real environment and also can see virtual images superposed on the real environment when wearing the AR glasses. When people use AR glasses, the lower side of AR glasses can be seen through to display system's light to shine user's eye below, seriously influence user's use and experience and cause information leakage easily.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a display optical system and a head-mounted display device.

The display optical system of the embodiment of the application comprises a display component, a projection optical component and a first optical component, wherein the display component comprises a display, and the display is used for projecting a virtual image along a projection optical path; the projection optical assembly comprises a projection polarizer for allowing light polarized in the first direction to pass through; the first optical assembly is arranged on the projection light path, and the projection optical assembly is arranged between the display assembly and the first optical assembly; the first optical assembly is used for reflecting light polarized along a first direction and transmitting light polarized along a second direction, and the first direction is perpendicular to the second direction.

In some embodiments, the first optical assembly includes a first polarizer and a polarization beam splitter, the first polarizer and the projection polarizer are respectively located on two opposite sides of the polarization beam splitter, the polarization beam splitter is configured to reflect the light polarized along the first direction and transmit the light polarized along the second direction, and the first polarizer is configured to allow the light polarized along the second direction to pass through.

In some embodiments, the first optical assembly further includes a first mirror disposed on a side of the first polarizer away from the polarization beam splitter, and a first antireflection film disposed on a side of the first mirror away from the first polarizer.

In some embodiments, the virtual image is reflected by the first optical element as a first virtual image polarized along the first direction, the display optical system further comprises a second optical element, the second optical element comprises a transmissive reflector and a second polarizer, the transmissive reflector is used for transmitting and reflecting light, and the first virtual image passes through the transmissive reflector to form a second virtual image; when the second virtual image reaches the second polarizer, the second virtual image can be absorbed by the second polarizer.

In some embodiments, the second optical assembly further includes a first polarization conversion element disposed on a side of the transmissive reflection element adjacent to the first optical assembly, the first polarization conversion element being configured to convert linearly polarized light and circularly polarized light; the first virtual image firstly passes through the first polarization conversion element, then is reflected by the transmission reflection element, and then passes through the first polarization conversion element again to form a third virtual image, and the third virtual image is polarized along a second direction and passes through the first optical assembly.

In some embodiments, the second optical assembly further includes a second polarization conversion element disposed between the transmissive and reflective element and the second polarization element, and the second polarization conversion element is configured to convert linearly polarized light and circularly polarized light; the second polarization piece allows light polarized along the first direction to pass through, the first virtual image sequentially passes through the first polarization conversion piece, penetrates through the transmission reflection piece and passes through the second polarization conversion piece to form a second virtual image, and the second virtual image is polarized along the second direction and can be absorbed by the second polarization piece.

In some embodiments, the transflective member reflects more light than the transflective member transmits when light passes through the transflective member.

In some embodiments, the second optical assembly further comprises a second mirror, a second antireflection film, and a third antireflection film, wherein the second mirror is disposed between the first polarization conversion element and the second polarization conversion element; the first polarization conversion part and the transmission reflection part are arranged between the second antireflection film and the second mirror body; and/or the second polarization conversion element and the second polarization element are arranged between the third antireflection film and the second mirror body.

In some embodiments, the projection optics further comprises a projection mirror group disposed between the display and the projection polarizer, the projection mirror group being configured to modulate the virtual image.

The head-mounted display device of the embodiment of the application comprises a main body and the display optical system of any one of the above embodiments, wherein the display optical system is arranged in the main body.

In the display optical system and the head-mounted display device according to the embodiment of the application, the display optical system includes a display module, a projection optical module and a first optical module, the display module includes a display, the first optical module is disposed on a projection optical path of the display, the projection optical module is disposed between the display and the first optical module, the projection polarizer is configured to allow light polarized in a first direction to pass through, after a virtual image passes through the projection polarizer, the virtual image is polarized along a first direction, the first optical assembly is capable of reflecting light polarized along the first direction and transmitting light polarized along a second direction, and the first direction is perpendicular to the second direction, so that the virtual image is reflected by the first optical component when reaching the first optical component, and no virtual image can penetrate through the first optical assembly, no light can irradiate under the eyes of the user, the use experience of the user can be improved, and the virtual image cannot be leaked.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a head mounted display device according to some embodiments of the present application;

FIG. 2 is a schematic diagram of a display optical system according to certain embodiments of the present application;

FIG. 3 is a schematic diagram of the structure of a display optical system according to certain embodiments of the present application;

FIG. 4 is a schematic diagram of the structure of a display optical system according to certain embodiments of the present application;

FIG. 5 is a schematic diagram of a display optical system according to some embodiments of the present application.

Description of the main element symbols:

the head-mounted display device 1000, the display optical system 100, the display module 10, the display 11, the projection optical module 20, the projection polarizer 21, the projection lens group 22, the first optical module 30, the polarization beam splitter 31, the first polarizer 32, the first mirror 33, the first antireflection film 34, the second optical module 40, the second antireflection film 41, the first polarization converter 42, the transmissive reflector 43, the second mirror 44, the second polarization converter 45, the second polarizer 46, the third antireflection film 47, and the main body 200.

Detailed Description

Embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, a head-mounted display apparatus 1000 according to an embodiment of the present disclosure includes a main body 200 and a display optical system 100, wherein the display optical system 100 is disposed in the main body 200, and the main body 200 can protect the display optical system 100 and provide an installation space. The head-mounted display device 1000 may be an AR device, a VR device, or the like, without limitation. In the embodiment of the present application, the head-mounted display device 1000 is described as an AR device, and it is understood that the specific form of the head-mounted display device 1000 may be other.

Further, referring to fig. 2, the display optical system 100 of the present application includes a display assembly 10, a projection optical assembly 20 and a first optical assembly 30, the display assembly 10 includes a display 11, the display 11 is used for projecting a virtual image along a projection optical path, the projection optical assembly 20 includes a projection polarizer 21, and the projection polarizer 21 is used for allowing light polarized along a first direction to pass through; the first optical assembly 30 is disposed on the projection light path, the projection optical assembly 20 is disposed between the display assembly 10 and the first optical assembly 30, and the first optical assembly 30 is used for reflecting light polarized along a first direction and transmitting light polarized along a second direction, wherein the first direction is perpendicular to the second direction.

In the display optical system 100 and the head-mounted display device 1000 according to the embodiment of the present application, the display optical system 100 includes a display component 10, a projection optical component 20, and a first optical component 30, the display component 10 includes a display 11, the first optical component 30 is disposed on a projection optical path of the display 11, the projection optical component 20 is disposed between the display component 10 and the first optical component 30, the projection polarizer 21 is configured to allow light polarized in a first direction to pass therethrough, after a virtual image passes through the projection polarizer 21, the virtual image is polarized in the first direction, the first optical component 30 is capable of reflecting the light polarized in the first direction and transmitting the light polarized in a second direction, and the first direction is perpendicular to the second direction, whereby the virtual image is reflected by the first optical component 30 when reaching the first optical component 30 without the virtual image passing through the first optical component 30, there is not light irradiation in user's eye below, can improve user's use and experience and can not cause virtual image to reveal.

The display optical system 100 may be an optical machine, and is configured to project a virtual image and a real environment image to eyes of a user. Specifically, the display assembly 10 includes a display 11, the display 11 is used for projecting a virtual image along a projection optical path, and the virtual image projected by the display 11 may be polarized light or unpolarized light, which is not limited herein. The display 11 may be a micro-display such as an OLED type, an LED type, an LCOS type, and an LCD type, and is not limited thereto.

The projection optical assembly 20 is disposed between the display assembly 10 and the first optical assembly 30, the projection optical assembly 20 includes a projection polarizer 21, the projection polarizer 21 allows light polarized along the first direction to pass through, it can be understood that the projection polarizer 21 has a function of screening the polarization direction of light, that is, light polarized along the first direction in light can be screened out, after unpolarized light passes through the projection polarizer 21, light polarized along the first direction can pass through the projection polarizer 21, and light passing through the projection polarizer 21 is light polarized along the first direction. The projection polarizer 21 may be a polarizer, or other elements with a function of screening polarization directions, which is not limited herein. The first direction may be an S-polarization direction, a P-polarization direction, or any other direction, which is not limited herein.

Further, the first optical assembly 30 is disposed on the projection light path of the display 11, that is, the virtual image can reach the first optical assembly 30, the first optical assembly 30 is used for reflecting the light polarized along the first direction and transmitting the light polarized along the second direction, and the first direction is perpendicular to the second direction, that is, the light polarized along the first direction reaches the first optical assembly 30 to be reflected by the first optical assembly 30, and the light polarized along the second direction reaches the first optical assembly 30 to be transmitted by the first optical assembly 30, that is, the light polarized along the second direction can pass through the first optical assembly 30.

Further, the projection optical assembly 20 is disposed between the display assembly 10 and the first optical assembly 30, and the virtual image projected by the display 11 needs to pass through the projection optical assembly 20 before reaching the first optical assembly 30, that is, the virtual image projected by the display 11 needs to pass through the projection polarizer 21 before reaching the first optical assembly 30, and the projection polarizer 21 allows the light polarized in the first direction to pass, so that the virtual image reaching the first optical assembly 30 is polarized in the first direction, therefore, the virtual image reaching the first optical assembly 30 can only be reflected by the first optical assembly 30 and can not be transmitted through the first optical assembly 30, thereby display 11's demonstration light can not shine in user's eye below, can not form the facula in user's eye below, can strengthen user's use and experience and can not cause virtual image to reveal, can not influence the pleasing to the eye of user's face when using simultaneously. The second direction may be an S-polarization direction, a P-polarization direction, or any other direction, which is not limited herein. In one embodiment, the first direction is the S-polarization direction and the second direction is the P-polarization direction.

Further, referring to fig. 2 again, the display light 41 projected by the display 11 passes through the projection polarizer 21 and becomes the projection light 42, the projection light 42 is polarized along the first direction, the projection light 42 reaches the first optical assembly 30, the first optical assembly 30 reflects the projection light as the first reflection light 43, the first reflection light 43 is polarized along the first direction, and since the first optical assembly 30 transmits the light polarized along the second direction, the transmission light 421 will not be generated, that is, the light emitted by the display 11 cannot pass through the first optical assembly 30, so that no light is irradiated under the eyes of the user, and the use experience of the user can be improved.

Further, referring to fig. 3, the first optical assembly 30 includes a first polarizer 32 and a polarization beam splitter 31, the first polarizer 32 and the projection polarizer 21 are respectively located on two opposite sides of the polarization beam splitter 31, the polarization beam splitter 31 is configured to reflect the light polarized along the first direction and transmit the light polarized along the second direction, and the first polarizer 32 is configured to allow the light polarized along the second direction to pass through. Specifically, the first polarizer 32 and the projection polarizer 21 are not on the same side of the polarization beam splitter 31, the projection polarizer 21 is disposed between the first optical assembly 30 and the display 11, specifically, the projection polarizer 21 is on a side of the polarization beam splitter 31 close to the display 11, the first polarizer 32 is on a side of the polarization beam splitter 31 far from the display 11, that is, the polarization beam splitter 31 is reached after the first polarizer 32 allows light polarized in the second direction to pass through, and the ambient light on the lower side of the first optical assembly 30 passes through the first polarizer 32 and is converted into polarization in the second direction, and can pass through the polarization beam splitter 31 and reach the display assembly 10.

Further, since the projection polarizer 21 allows light polarized in the first direction to pass through, since the first direction is perpendicular to the second direction, the projection polarizer 21 can absorb light polarized in the second direction. The ambient light reaching the projection polarizer 21 is polarized along the second direction, the projection polarizer 21 can absorb the ambient light, and the projection polarizer 21 is disposed between the first optical assembly 30 and the display 11, so the ambient light below the first optical assembly 30 cannot reach the display 11, that is, the ambient light below the first optical assembly 30 does not illuminate the display 11, the influence of the ambient light outside the first optical assembly 30 on the use performance of the head-mounted display apparatus 1000 can be prevented, and the imaging quality of the display optical system 100 can be improved.

Further, referring to fig. 3, in an embodiment, the projection polarizer 21 includes a first polarizer, the first polarizer 32 includes a second polarizer, and the polarization beam splitter 31 includes a polarization beam splitting film, wherein the polarization direction of the first polarizer is a first direction, the polarization direction of the second polarizer is a second direction, the polarization beam splitting film is capable of reflecting the light polarized along the first direction and transmitting the light polarized along the second direction, the light polarized along the first direction is a first polarized light, and the light polarized along the second direction is a second polarized light. Specifically, the ambient light 61 on the lower side of the first optical assembly 30 passes through the second polarizer and becomes the second polarized light, the ambient light 61 may pass through the polarization splitting film and become the first transmission light 62, and after the first transmission light 62 reaches the first polarizer, the first transmission light 62 is the second polarized light, so that the first polarizer can absorb the first transmission light 62, the first transmission light 62 does not pass through the first polarizer and reaches the display 11, and the display 11 is not illuminated. Meanwhile, the ambient light 61 passes through the second polarizer and then becomes second polarized light, and the ambient light is not reflected when reaching the polarization beam splitting film, so that the ambient light 61 below the first optical assembly 30 does not enter the eyes of the user, an artifact is not formed, and the visual experience of the user is better.

Referring to fig. 4, in some embodiments, the virtual image projected by the display 11 is reflected by the first optical assembly 30 to be a first virtual image polarized along a first direction, the display optical system 100 further includes a second optical assembly 40, the second optical assembly 40 includes a transmissive reflector 43 and a second polarizer 46, the first virtual image passes through the transmissive reflector 43 to form a second virtual image, and when the second virtual image reaches the second polarizer 46, the second polarizer 46 can absorb the second virtual image, so that the second virtual image cannot pass through the second optical assembly 40, the virtual image viewed by the user is not seen by other users, and the privacy of the user can be protected from being leaked.

Specifically, the transflective member 43 is used for transmitting and reflecting light, that is, when the light reaches the transflective member 43, a part of the light can pass through the transflective member 43, and another part of the light can be reflected by the transflective member 43, wherein the ratio of transmission to reflection can be adjusted, and when the first virtual image reaches the transflective member 43, the transmitted part of the first virtual image forms the second virtual image. When the second virtual image reaches the second polarizer 46, the second polarizer 46 can absorb the second virtual image, and it can be understood that the screened polarization direction of the second polarizer 46 is perpendicular to the polarization direction of the second virtual image, so that the second virtual image cannot pass through the second polarizer 46, that is, the second virtual image cannot enter the outside. The second polarizer 46 may be a polarizer, or other elements with polarization screening function, and is not limited herein.

Referring to fig. 4, in some embodiments, the second optical assembly 40 further includes a first polarization conversion element 42, and it can be understood that the second optical assembly 40 includes a transmissive reflection element 43, a second polarization element 46 and a first polarization conversion element 42, and the first polarization conversion element 42 is disposed on a side of the transmissive reflection element 43 close to the first optical assembly 30, that is, light from the first optical assembly 30 to the second optical assembly 40 first passes through the first polarization conversion element 42 and then reaches the transmissive reflection element 43. The first polarization conversion member 42 is used for converting linearly polarized light and circularly polarized light, that is, the linearly polarized light can be converted into circularly polarized light by passing through the first polarization conversion member 42, and the circularly polarized light can be converted into linearly polarized light by passing through the first polarization conversion member 42. The first polarization conversion element 42 may be a quarter-wave plate or other elements capable of converting linearly polarized light and circularly polarized light, which is not limited herein.

Further, the first virtual image reflected by the first optical assembly 30 sequentially passes through the first polarization conversion element 42 and is reflected by the transmissive reflection element 43, and after passing through the first polarization conversion element 42, the first virtual image is a third virtual image polarized along the second direction and passes through the first optical assembly 30. Specifically, the first virtual image passes through the first polarization conversion element 42 and reaches the transmission reflection element 43, a part of the first virtual image is reflected by the transmission reflection element 43 back to the first polarization conversion element 42, and passes through the first polarization conversion element 42 again to form a third virtual image, because the first virtual image is polarized along the first direction, the third virtual image is polarized along the second direction, the polarization beam splitter can transmit the light polarized along the second direction, the first polarization element 32 can allow the light polarized along the second direction to pass through, and the third virtual image can pass through the polarization beam splitter and the first polarization element 32 in sequence and reach the eyes of the user, so that the user can view the virtual image projected by the display 11.

Further, referring to fig. 4, in some embodiments, the second optical assembly 40 further includes a second polarization conversion element 45, and the second polarization conversion element 45 is disposed between the transmissive and reflective element 43 and the second polarization element 46, that is, the portion of the first virtual image transmitted by the transmissive and reflective element 43 first passes through the second polarization conversion element 45 and then reaches the second polarization element 46. The second polarizer 46 allows light polarized in the first direction to pass through, that is, the polarization direction of the second polarizer 46 is the first direction, and when reaching the second polarizer 46, the light polarized in the second direction will be absorbed by the second polarizer 46 and cannot pass through the second polarizer 46. Specifically, the first virtual image passes through the first polarizer 32, the transmissive reflector 43 and the second polarization converter 45 to form a second virtual image, and the second virtual image is polarized along the second direction, so that the second virtual image can be absorbed by the second polarizer 46, and therefore, the display content on the display 11 cannot be seen on the outer side of the second optical assembly 40, and the viewing privacy of the user can be protected. The second polarization conversion element 45 may be a quarter-wave plate or other element having a function of converting linearly polarized light and circularly polarized light, and the second polarization conversion element 45 may be the same as or different from the first polarization conversion element 42, which is not limited herein.

Further, in an embodiment, the projection polarizer 21 includes a first polarizer, the virtual image projected by the display 11 is unpolarized light, the polarization splitter 31 includes a polarization splitting film, the first polarizer 32 includes a second polarizer, the first polarization converter 42 includes a first quarter-wave plate, the transmissive reflector 43 includes a transmissive reflector, the second polarization converter 45 includes a second quarter-wave plate, the second polarizer 46 includes a third polarizer, the polarization direction of the first polarizer is a first direction, the polarization direction of the second polarizer is a second direction, the polarization direction of the third polarizer is a first direction, the light polarized along the first direction is the first polarized light, and the polarization direction polarized along the second direction is the second polarized light.

Further, referring to fig. 4, the projection light 420 of the display light 410 projected by the display 11 passing through the projection polarizer 21 is a first polarized light, the projection light 420 is reflected by the polarization splitter 31 as a first reflected light 430, the first reflected light 430 is a first polarized light, the first reflected light 430 passes through the first polarization converter 42 to become a left-handed circularly polarized light 440, the left-handed circularly polarized light 440 is divided by the transmission reflector 43 into a second transmitted light 441 and a right-handed circularly polarized light 450, the right-handed circularly polarized light 450 passes through the first polarization converter 42 to become a third transmitted light 460, the third transmitted light 46 is a second polarized light, the third transmitted light 460 can pass through the first optical assembly 30 to become a fourth transmitted light 470, and finally the fourth transmitted light 470 enters into the eyes of the user, so that the user can view the display light 410 projected by the display 11, that the user can view a virtual image.

Further, the second transmission light 441 transmitted by the transmissive/reflective member 43 is left-handed circularly polarized light, the second transmission light 441 passes through the second polarization conversion member 45 and then becomes the fourth transmission light 442, the fourth transmission light 442 is second polarized light, and the polarization direction of the second polarization member 46 is the first direction, so that the fourth transmission light 442 cannot pass through the second polarization member 46, and therefore, the light projected by the display 11 on the display optical system 100 cannot be leaked out, and the user cannot view the projected content of the display 11 except for the user himself or herself, which can protect the privacy of the user.

The ratio of transmission to reflection in the transflective member 43 may be 1:1, 1:4, 3:7, 3:2, 2:3, 7:3, 4:1, and the like, which is not limited herein. The ratio of transmission to reflection in the transreflective member 43 is 1:1, i.e., 50% of the light is transmitted and 50% of the light is reflected when the light reaches the transreflective member 43.

In some embodiments, when the light passes through the transflective member 43, the light reflected by the transflective member 43 is more than the light transmitted by the transflective member 43, i.e., the reflectivity in the transflective member 43 is greater than the transmissivity, for example, the ratio of transmission to reflection in the transflective member 43 can be 1:4, 3:7, 2: 3. When the first virtual image reaches the transmissive reflector 43, more of the first virtual image can be reflected back to the first optical assembly 30, so that the user can see a clearer virtual image, the visual experience of the user can be improved, and the light effects of the virtual image and the environment image can be balanced.

Referring to fig. 5, the environment image outside the second optical assembly 40 sequentially passes through the second polarization member 46, the second polarization conversion member 45, the transmission reflection member 43, and the first polarization conversion member 42 to form a first environment image, and the first environment image is polarized along the second direction, passes through the first optical assembly 30, and finally enters the eyes of the user.

Specifically, the environment image is a field of view environment light 51 outside the second optical assembly 40, the field of view environment light 51 is natural light, that is, unpolarized light, the field of view environment light 51 passes through the second polarizer 46 to become first environment light 52, the first environment light 52 is first polarized light, the first environment light 52 passes through the second polarization converter 45 to become second environment light 53, the second environment light 53 is right circularly polarized light, the second environment light 53 is divided into two beams of transmitted and reflected light when reaching the transmissive reflector 43, wherein a transmitted portion of the second environment light 53 passes through the first polarization converter 42 to become third environment light 54, and the third environment light 54 is second polarized light, so that the third environment light 54 can pass through the polarization splitter 31 and the first polarizer 32 and reach the eyes of the user, and the user can see a real environment field of view.

Further, the part of the second ambient light 53 reflected by the transmissive reflector 43 is reflected by the transmissive reflector 43 as fourth ambient light 531, the fourth ambient light 531 is left circularly polarized light, the fourth ambient light 531 is fifth ambient light 532 after passing through the second polarization conversion element 45, the fifth ambient light 532 is second polarized light, the second polarizer 46 allows light polarized along the first direction to pass through, and the fifth ambient light 532 cannot pass through the second polarizer 46, so that no reflection of the ambient light outside the second optical assembly 40 can be realized.

Referring to fig. 3 to 5, in some embodiments, the first optical assembly 30 further includes a first mirror 33 and a first antireflection film 34, the first mirror 33 is disposed on a side of the first polarizer 32 away from the polarization beam splitter 31, and the first antireflection film 34 is disposed on a side of the first mirror 33 away from the first polarizer 32. The material of the first mirror 33 may be glass or other transparent materials. The first mirror 33 can provide a mounting carrier for the first polarizer 32 and the polarization beam splitter 31, and the first polarizer 32 and the polarization beam splitter 31 are more stable and convenient to mount by using the first mirror 33. By installing the first antireflection film 34, the virtual image and the environment image entering the eyes of the user can be increased, and the visual experience of the user is improved. Of course, the installation positions of the first mirror body 33 and the first antireflection film 34 may be other.

Further, in some embodiments, second optical assembly 40 further includes a second mirror 44, a second antireflection film 41, and/or a third antireflection film 47. The second mirror 44 is disposed between the first polarization conversion element 42 and the second polarization conversion element 45, and the second mirror 44 may provide a mounting carrier for the transmissive/reflective element 43, the first polarization conversion element 42, the second polarization conversion element 45, and the second polarization element 46. The first polarization conversion element 42 and the transmissive and reflective element 43 are disposed between the second antireflection film 41 and the second mirror 44, that is, the second antireflection film 41 is disposed on a side of the first polarization conversion element 42 close to the first optical assembly 30, and the second antireflection film 41 can allow more environmental images and virtual images to enter the first optical assembly 30, so that more environmental images and virtual images enter the eyes of the user. The second polarization conversion element 45 is disposed between the third antireflection film 47 and the second mirror body 44, that is, the third antireflection film 47 is disposed on a side of the second polarization conversion element 45 away from the transmissive reflection element 43, so that the third antireflection film 47 can transmit more environmental images to the second polarization conversion element 45, and further more environmental images enter the eyes of the user, so that the user can see the real environmental images more clearly.

Specifically, the second mirror 44 may be a spherical surface, an aspheric surface, or a free-form surface, the first polarization conversion element 42 is a first quarter-wave plate, the second polarization conversion element 45 is a second quarter-wave plate, and the transmissive reflection element 43 is a transmissive reflection film, the second mirror 44 is fixed during installation, the transmissive reflection film is installed on the side of the second mirror 44 close to the first optical assembly 30, and then the first quarter-wave plate is installed, and the first quarter-wave plate is pasted on the transmissive reflection film in a curved surface form. The second quarter-wave plate is attached to the side of the second mirror 44 away from the first optical assembly 30 in the form of a curved surface, and more specifically, the second quarter-wave plate may be first made into a curved surface and then attached, or the first quarter-wave plate may be directly attached when being thermally pressed into a curved surface, thereby achieving the integration of the second optical assembly 40.

In one embodiment, second optical assembly 40 includes a second antireflection film 41 to allow more environmental images and virtual images to enter the user's eyes, which is a better visual experience for the user. In another embodiment, second optical assembly 40 includes a third antireflection film 47 to allow more ambient images to enter the user's eye, which is a better visual experience for the user. In still another embodiment, second optical assembly 40 includes second antireflection film 41 and third antireflection film 47, so that the environmental image and the virtual image enter more eyes of the user, and the visual experience of the user is enhanced.

Referring to fig. 2, in some embodiments, the projection optical assembly 20 further includes a projection lens group 22, the projection lens group 22 is disposed between the display 11 and the projection polarizer 21, and the projection lens group 22 is configured to modulate the virtual image projected by the display 11. Specifically, the projection lens group 22 may be a combination of a plurality of lenses, or may be a single lens, which is not limited herein. The projection lens group 22 is disposed between the display 11 and the projection polarizer 21, the virtual image projected by the display 11 first passes through the projection lens group 22, and the projection lens group 22 can perform modulation processing such as aberration correction and magnification and reduction on the reached virtual image, so that the virtual image seen by the user is clearer or has a larger view field, and the visual experience of the user can be enhanced.

It should be noted that, in fig. 2 to fig. 5, each component included in the display assembly 10 may be sequentially attached, for example, the display 11, the projection lens group 12, and the projection polarizer 13 are sequentially attached, each component included in the first optical assembly 30 may be sequentially attached, for example, the polarization beam splitter 31, the first polarizer 32, the first mirror 33, and the first antireflection film 34 are sequentially attached, and each component included in the second optical assembly 40 may be sequentially attached, for example, the second antireflection film 41, the first polarization conversion element 42, the transmission reflection element 43, the second mirror 44, the second polarization conversion element 45, the second polarization element 46, and the third antireflection film 47 are sequentially attached.

In the description herein, reference to the description of the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.

Claims (10)

1. A display optical system, characterized in that the display optical system comprises:

a display assembly including a display for projecting a virtual image along a projection light path;

a projection optics assembly comprising a projection polarizer for allowing light polarized in a first direction to pass through; and

the first optical assembly is arranged on the projection light path, the projection optical assembly is arranged between the display assembly and the first optical assembly, the first optical assembly is used for reflecting light polarized along the first direction and transmitting light polarized along the second direction, and the first direction is perpendicular to the second direction.

2. The display optical system according to claim 1, wherein the first optical assembly includes a first polarizer and a polarization beam splitter, the first polarizer and the projection polarizer are respectively located on two opposite sides of the polarization beam splitter, the polarization beam splitter is configured to reflect the light polarized along the first direction and transmit the light polarized along the second direction, and the first polarizer is configured to allow the light polarized along the second direction to pass through.

3. The display optical system according to claim 2, wherein the first optical assembly further comprises a first mirror and a first antireflection film, the first mirror is disposed on a side of the first polarizer away from the polarization beam splitter, and the first antireflection film is disposed on a side of the first mirror away from the first polarizer.

4. The display optical system according to claim 1, wherein the virtual image is reflected by the first optical component as a first virtual image polarized in the first direction, the display optical system further comprising a second optical component comprising:

the transmission reflection piece is used for transmitting and reflecting light rays, and the first virtual image passes through the transmission reflection piece to form a second virtual image; and

a second polarizer, the second virtual image being capable of being absorbed by the second polarizer when the second virtual image reaches the second polarizer.

5. The display optical system according to claim 4, wherein the second optical assembly further comprises:

the first polarization conversion part is arranged on one side, close to the first optical component, of the transmission reflection part and is used for converting linearly polarized light and circularly polarized light;

the first virtual image firstly passes through the first polarization conversion element, then is reflected by the transmission reflection element, and then passes through the first polarization conversion element again to form a third virtual image, and the third virtual image is polarized along a second direction and passes through the first optical assembly.

6. The display optical system according to claim 5, wherein the second optical assembly further comprises:

the second polarization conversion piece is arranged between the transmission reflection piece and the second polarization piece, and is used for converting linearly polarized light and circularly polarized light;

the second polarization piece allows light polarized along the first direction to pass through, the first virtual image sequentially passes through the first polarization conversion piece, penetrates through the transmission reflection piece and passes through the second polarization conversion piece to form a second virtual image, and the second virtual image is polarized along the second direction and can be absorbed by the second polarization piece.

7. The display optical system according to claim 4, wherein the transmitted light passes through the transflective member more light is reflected by the transflective member than is transmitted by the transflective member.

8. The display optical system according to claim 6, wherein the second optical assembly further comprises:

the second mirror body is arranged between the first polarization conversion piece and the second polarization conversion piece;

the first polarization conversion piece and the transmission reflection piece are arranged between the second antireflection film and the second mirror body; and/or

And the second polarization conversion piece and the second polarization piece are arranged between the third antireflection film and the second mirror body.

9. The display optical system according to claim 1, wherein the projection optical assembly further comprises a projection mirror group disposed between the display and the projection polarizer, the projection mirror group being configured to modulate the virtual image.

10. A head-mounted display device, comprising:

a main body; and

the display optical system according to any one of claims 1 to 9, which is disposed in the main body.

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