CN111399224A - Display optical system and head-mounted display device - Google Patents
Display optical system and head-mounted display device Download PDFInfo
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- CN111399224A CN111399224A CN202010315315.0A CN202010315315A CN111399224A CN 111399224 A CN111399224 A CN 111399224A CN 202010315315 A CN202010315315 A CN 202010315315A CN 111399224 A CN111399224 A CN 111399224A
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- 230000010287 polarization Effects 0.000 claims description 155
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- 238000003384 imaging method Methods 0.000 abstract description 6
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B2027/0178—Eyeglass type
Abstract
The application discloses a display optical system, which comprises a first optical assembly, a projection optical assembly and a display assembly, wherein the first optical assembly comprises a first polarizing piece and a polarizing reflecting piece, the polarizing reflecting piece is used for reflecting light polarized along a first direction and transmitting light polarized along a second direction, the first polarizing piece is used for allowing the light polarized along the second direction to pass through, and the second direction is perpendicular to the first direction; the projection optical assembly includes a projection polarizer for allowing light polarized in a first direction to pass therethrough; the display component and the first optical component are respectively positioned on two opposite sides of the projection optical component, and the display component is used for projecting virtual images. In the display optical system and the head-mounted display device of the application, the display component can be prevented from being illuminated by the ambient light on the lower side, and the imaging quality of the display optical system can be improved.
Description
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. There is not sheltering from the structure at AR glasses downside (near the eye bag), has stronger parasitic light to get into usually, and stronger parasitic light can illuminate display element, and display element luminance is higher, results in producing adverse effect to display system imaging quality, further influences user's visual experience.
Disclosure of Invention
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 first optical assembly, a projection optical assembly and a display assembly, wherein the first optical assembly comprises a first polarizing piece and a polarizing reflecting piece, the polarizing reflecting piece is used for reflecting light polarized along the first direction and transmitting light polarized along the second direction, the first polarizing piece is used for allowing light polarized along the second direction to pass through, and the second direction is perpendicular to the first direction; the projection optical assembly includes a projection polarizer for allowing light polarized in a first direction to pass therethrough; the display assembly and the first optical assembly are respectively positioned on two opposite sides of the projection optical assembly, and the display assembly is used for projecting virtual images.
In some embodiments, the display optical system further includes a second optical assembly including a first polarization conversion member for converting linearly polarized light and circularly polarized light and a transmissive reflection member; the transmission reflection piece is used for transmitting and reflecting light rays; after the virtual image reflected by the first optical assembly sequentially passes through the first polarization conversion piece, is reflected by the transmission reflection piece and passes through the first polarization conversion piece, the polarization direction of the virtual image is converted from the first direction to the second direction, and the virtual image polarized along the second direction passes through the first optical assembly.
In some embodiments, the second optical assembly further includes a second polarization conversion element and a second polarization element, the second polarization conversion element is configured to convert linearly polarized light and circularly polarized light, and the second polarizer is configured to allow light polarized in a first direction to pass through, wherein the virtual image reflected by the first optical assembly passes through the first polarization conversion element, passes through the transmissive reflection element, and after passing through the second polarization conversion element, the polarization direction of the virtual image is converted from the first direction to the second direction, and the virtual image along the second direction is absorbed by the second polarization element.
In some embodiments, after the environmental image sequentially passes through the second polarization element, the second polarization conversion element, the transmission reflection element and the first polarization conversion element, the environmental image is polarized along the second direction and passes through the first optical assembly.
In some embodiments, the second optical assembly further includes a lens, the first polarization conversion element and the transflective element are disposed on a side of the lens close to the first optical assembly, and the second polarization conversion element and the second polarizing element are disposed on a side of the lens far from the first optical assembly.
In some embodiments, the second optical assembly further includes an inner anti-reflection film and/or an outer anti-reflection film, the first polarization conversion element and the transmissive reflection element are disposed between the inner anti-reflection film and the lens, and the second polarization conversion element and the second polarization element are disposed between the outer anti-reflection film and the lens.
In some embodiments, the projection optical assembly further comprises a fresnel lens disposed in a projection optical path of the virtual image, wherein: the Fresnel lens is arranged between the display and the display polarizer; or the display polarizer is arranged between the display and the Fresnel lens.
In some embodiments, the projection optical assembly further includes at least two lenses, and the fresnel lens and the projection polarizer are respectively disposed on two different lenses.
In some embodiments, the display light of the display is polarized along the first direction or is unpolarized light, and the polarization direction of the display polarizer is the first direction.
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 of the embodiment of the application, the display optical system includes a first optical component, a projection optical component and a display component, the display component and the first optical component are respectively located on two opposite sides of the projection optical component, and ambient light outside the first optical component sequentially passes through the first optical component, the projection optical component and the display component. The first optical assembly comprises a first polarizing piece and a polarization reflecting piece, the projection optical assembly comprises a projection polarizing piece, ambient light outside the first optical assembly firstly passes through the first polarizing piece and becomes polarized along the second direction and then passes through the polarization reflecting piece to reach the projection polarizing piece, and the projection polarizing piece allows light polarized along the first direction to pass through, and the first direction is vertical to the second direction, so the ambient light cannot pass through the projection polarizing piece and cannot reach the display assembly, therefore, the display assembly cannot be illuminated by the ambient light on the lower side of the first optical assembly, and the display optical system and the head-mounted display device can present better imaging quality.
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 some embodiments of the present application;
FIG. 3 is a schematic diagram of a display optical system according to some embodiments of the present application;
FIG. 4 is a schematic structural diagram of a display optical system according to some 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 first optical assembly 10, the first polarizer 11, the polarizing reflector 12, the third antireflection film 13, the first optical plate body 14, the projection optical assembly 20, the projection polarizer 21, the fresnel lens 22, the lens 23, the first lens 231, the second lens 232, the first antireflection film 24, the second antireflection film 25, the display assembly 30, the display 31, the second optical assembly 40, the first polarization conversion element 41, the transmissive reflector 42, the second polarization conversion element 43, the second polarizer 44, the lens 45, the inner antireflection film 46, the outer 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 head-mounted display device 1000 may be other devices.
Further, referring to fig. 2, the display optical system 100 of the present embodiment includes a first optical assembly 10, a projection optical assembly 20, and a display assembly 30, wherein the first optical assembly 10 includes a first polarizer 11 and a polarization reflector 12, the polarization reflector 12 is configured to reflect light polarized along a first direction and transmit light polarized along a second direction, the first polarizer 11 is configured to allow light polarized along the second direction to pass through, and the second direction is perpendicular to the first direction; the projection optical assembly 20 includes a projection polarizer 21, the projection polarizer 21 for allowing light polarized in a first direction to pass therethrough; the display assembly 30 and the first optical assembly 10 are respectively located on two opposite sides of the projection optical assembly 20, and the display assembly 30 is used for projecting a virtual image.
In the display optical system 100 and the head-mounted display device 1000 according to the embodiment of the application, the display optical system 100 includes the first optical element 10, the projection optical element 20 and the display element 30, the display element 30 and the first optical element 10 are respectively located on two opposite sides of the projection optical element 20, and the ambient light outside the first optical element 10 sequentially passes through the first optical element 10, the projection optical element 20 and the display element 30. The first optical assembly 10 includes a first polarizer 11 and a polarization reflector 12, the projection optical assembly 20 includes a projection polarizer 21, the ambient light outside the first optical assembly 10 first passes through the first polarizer 11, becomes polarized along the second direction, and then passes through the polarization reflector 12 to reach the projection polarizer 21, since the projection polarizer 21 allows the light polarized along the first direction to pass through, and the first direction is perpendicular to the second direction, the ambient light cannot pass through the projection polarizer 21 and cannot reach the display assembly 30, therefore, the display assembly 30 is not illuminated by the ambient light outside the first optical assembly 10, and the display optical system 100 and the head-mounted display device 1000 can present better imaging quality.
Specifically, the display assembly 30 is used for projecting virtual images, the display assembly 30 includes a display 31, the display 31 can project virtual images along a projection light path, wherein the virtual images projected by the display 31 can be polarized light or unpolarized light, but are not limited thereto, the display 31 can be micro-displays such as O L ED type, L ED type, L type, and L CD type, but is not limited thereto.
The projection optical assembly 20 is disposed on a projection optical path of the display 31, the projection optical assembly 20 is used for modulating the virtual image projected by the display assembly 30, the projection optical assembly 20 includes a projection polarizer 21, the projection polarizer 21 allows light polarized along a first direction to pass through, it can be understood that the projection polarizer 21 has a polarization function, and the polarization direction is the first direction, and unpolarized light passing through the projection polarizer 21 can be converted into light polarized along the first direction. The projection polarizer 21 may be a polarizer, or an element with a polarization function, which is not limited herein, and the first direction may be an S polarization direction, a P polarization direction, or other directions.
Further, the first optical assembly 10 and the display assembly 30 are respectively located on two opposite sides of the projection optical assembly 20. It is understood that the first optical assembly 10 and the display assembly 30 are not on the same side of the projection optical assembly 20, the virtual image projected by the display assembly 10 needs to pass through the projection optical assembly 20 to reach the first optical assembly 10, and the ambient light outside the first optical assembly 10 needs to pass through the projection optical assembly 20 to reach the display assembly 30.
Specifically, the first optical assembly 10 includes a first polarizer 11 and a polarizing reflector 12. The first polarizer 11 is disposed on a side of the polarization reflector 12 away from the projection optical assembly 20, the first polarizer 11 is configured to allow light polarized along a second direction to pass through, where the second direction may be an S polarization direction, a P polarization direction, or other directions, without limitation, unpolarized light passing through the first polarizer 11 may be converted into light polarized along the second direction, and the first polarizer 11 may transmit light polarized along the second direction.
Further, the polarization reflector 12 can reflect the light polarized along the first direction and transmit the light polarized along the second direction, the ambient light outside the first optical assembly 10 passes through the first polarizer 11 and then is polarized along the second direction, and can reach the projection optical assembly after passing through the polarization reflector 12, specifically, the ambient light passes through the polarization reflector 12 and reaches the projection polarizer 21, the projection polarizer 21 can allow the light polarized along the first direction to pass through, the first direction is perpendicular to the second direction, and the light polarized along the second direction cannot pass through the projection polarizer 21, so that the ambient light cannot pass through the projection polarizer 21 and further cannot reach the display assembly 30, and the ambient light cannot illuminate the display 31, and the display optical system 100 can achieve a better imaging effect.
Further, after the virtual image projected by the display 31 passes through the projection optical assembly 20, the light of the virtual image reaching the first optical assembly 10 is polarized along the first direction, so that the polarization reflector 12 can reflect the virtual image projected by the display assembly 30 to the first optical assembly 10.
In one embodiment, the first direction is S-polarization direction, the second direction is P-polarization direction, the projecting polarizer 21 includes a first polarizer, the polarization direction of the first polarizer is S-polarization direction, the first polarizer 11 includes a second polarizer, and the polarization direction of the second polarizer is P-polarization direction, so that the first polarizer can absorb the light in P-polarization direction, and the second polarizer can absorb the light in S-polarization direction.
Further, referring to fig. 2 again, in an embodiment, the ambient light 101 outside the first optical assembly 10 is natural light, i.e., unpolarized light, the first polarizer 11 includes a second polarizer, the projection polarizer 21 includes a first polarizer, and the polarization reflector 12 includes a polarization reflective film. Specifically, the ambient light 101 passes through the first polarizer 11 and is converted into the second polarized light, the second polarized light can be transmitted through the polarization reflecting member 12 to become the transmission light 102, and the transmission light 102 is the second polarized light, so that the transmission light 102 can be absorbed by the transmission polarizer 21 when arriving, thereby preventing the ambient light 101 outside the first optical assembly 10 from influencing the use performance of the head-mounted display device 1000, and improving the imaging quality of the display optical system 100.
Further, referring to fig. 3 and 4, in some embodiments, the display optical system 100 further includes a second optical assembly 40, and the second optical assembly 40 includes a first polarization conversion element 41 and a transmissive reflection element 42, wherein the first polarization conversion element 41 can convert linearly polarized light and circularly polarized light, it can be understood that the linearly polarized light can be changed into circularly polarized light after passing through the first polarization conversion element 41, and the circularly polarized light can be changed into linearly polarized light after passing through the first polarization conversion element 41. The transflective member 42 can transmit and reflect light, it can be understood that when the light reaches the transflective member 42, a part of the light is reflected by the transflective member 42, and another part of the light can pass through the transflective member 42, wherein the ratio of transmission to reflection in the transflective member 42 can be adjusted, and the specific ratio of transmission to reflection is not limited herein.
Further, the virtual image of the display element 30 is reflected to the second optical element 40 after passing through the first optical element 10, specifically, referring to fig. 4, the display element 30 projects the virtual image to the first polarization conversion element 41 after being reflected by the polarization reflection element 12, the virtual image is changed from polarization along the first direction to circularly polarized light, then part of the virtual image reaching the transreflective member 42 is reflected back to the first polarization conversion member 41, after the portion of the virtual image passes through the first polarization conversion member 41, the portion of the virtual image is changed from the circularly polarized light to be polarized along the second direction, the portion of the virtual image can pass through the polarization reflector 12 to the first polarizer 11, and the polarization direction of the first polarizer 11 is the second direction, so that the portion of the virtual image can pass through the first polarizer 11 and reach the eyes of the user, and thus the user can view the virtual image projected by the display 31.
Referring to fig. 4 again, in some embodiments, the second optical assembly 40 further includes a second polarization conversion element 43 and a second polarization element 44, the second polarization conversion element 43 is used for converting linearly polarized light and circularly polarized light, it can be understood that the linearly polarized light can be changed into circularly polarized light after passing through the second polarization conversion element 43, the circularly polarized light can be changed into linearly polarized light after passing through the second polarization conversion element 43, the second polarization element 44 is used for allowing light polarized along the first direction to pass through, the virtual image reflected by the first optical assembly 10 passes through the first polarization conversion element 41, passes through the transmission reflection element 42, and passes through the second polarization conversion element 43, the polarization direction of the virtual image is converted from the first direction to the second direction, and since the polarization direction of the second polarization element 44 is the first direction, the virtual image polarized along the second direction is absorbed by the second polarization element 44, and therefore, the virtual image does not pass through the second polarization element 44 and enters the outside, other people except the user cannot acquire the image watched by the user from the outer side of the head-mounted display device 1000, so that the image information watched by the user cannot be leaked, the information security when the user watches is improved, and the privacy of the user is protected.
Referring to fig. 3 and fig. 4 again, in some embodiments, the projection optical assembly 20 further includes a fresnel lens 22, and the fresnel lens 22 is disposed on the projection optical path of the virtual image, wherein the fresnel lens 22 may be disposed between the display 31 and the projection polarizer 21, or the projection polarizer 21 is disposed between the display 31 and the fresnel lens 22, which is not limited herein. In the embodiment shown in fig. 2 and 3, the fresnel lens 22 is disposed between the display 31 and the projection polarizer 21. Through set up fresnel lens 22 on projecting the light path, firstly, fresnel lens 22 can assemble light, reduce the colour difference, can design out the optical system that the angle of field is greater than 60 behind the use fresnel lens 22 simultaneously, it is bigger than the display optical system who uses ordinary lens to make the field range that shows optical system 100, user's visual experience is better, in addition, compare ordinary lens, fresnel lens 22 thickness is less, can effectively alleviate the weight of projecting optical assembly 20, alleviate the weight that shows optical system 100, further lighten head-mounted display device 1000's weight, promote user's use comfort. Meanwhile, a larger angle of view can be achieved in a limited space by using the fresnel lens 22. Further, the use of the fresnel lens 22 can also eliminate partial spherical aberration.
Referring to fig. 3, in some embodiments, the projection optical assembly 20 further includes at least two lenses 23, and the fresnel lens 22 and the projection polarizer 21 are respectively disposed on two different lenses 23, it is understood that the number of the lenses 23 is at least two, that is, the number of the lenses 23 may be two, three, four, and the like, which is not limited herein. By providing a plurality of lenses 23, the virtual image projected by the display 31 can be modulated, and the aberration of the virtual image can be reduced. The lens 23 may be made of glass or other light-permeable materials. In an embodiment, the number of the lenses 23 is two, and the two lenses are a first lens 231 and a second lens 232, respectively, the fresnel lens 22 is disposed on the first lens 231, and the projection polarizer 21 is disposed on the second lens 232, so that the first lens 231 may be closer to the display 31 than the fresnel lens 22, or the first lens 231 may be farther from the display 31 than the fresnel lens 22, and the second lens 242 may be closer to the display 31 than the projection polarizer 21, or the second lens 242 may be farther from the display 31 than the projection polarizer 21, which is not limited herein.
Further, the number of the fresnel lenses 22 may be one, two, three, four, etc., and is not limited herein. It can be determined according to actual design requirements, and a plurality of fresnel lenses 22 can be arranged to achieve better visual effects.
Referring to fig. 3 to 5, in an embodiment, the virtual image light projected by the display 31 is unpolarized light, the projection polarizer 21 includes a first polarizer, the polarization direction of the first polarizer is a first direction, the polarization reflector 12 includes a polarization reflective film, the first polarizer 11 includes a second polarizer, the polarization direction of the second polarizer is a second direction, the first polarization conversion element 41 includes a first quarter-wave plate, the transmission reflector 42 includes a transmission reflective film, the second polarization conversion element 43 includes a second quarter-wave plate, the second polarizer 44 includes a third polarizer, the direction of the third polarizer is the first direction, the polarization light polarized along the first direction is defined as the first polarized light, and the polarization light polarized along the second direction is defined as the second polarized light, so that the transmission reflector can reflect the first polarized light and transmit the second polarized light.
Further, the virtual image 301 projected by the display 31 is unpolarized light, and first passes through the fresnel lens 22 to become a first transmitted light 302, and then passes through the first polarizer to become a second transmitted light 303, where the second transmitted light 303 is a first polarized light, and the second transmitted light 303 reaches the polarized reflective film, and since the polarized reflective film does not transmit the first polarized light, the second transmitted light 303 does not pass through the polarized reflective film, and thus, the pouch area of the user is not illuminated. Further, the second transmitted light 303 is reflected by the polarization reflection film to become a first reflected light 304, the first reflected light 304 passes through the first quarter-wave plate to become left-handed circularly polarized light, the left-handed circularly polarized light reaches the transmission reflection film and is divided into two beams of transmitted light and reflected light, wherein the transmission and reflection ratio can be adjusted, the left-handed circularly polarized light of the reflected part is reflected to become right-handed circularly polarized light, the right-handed circularly polarized light sequentially passes through the first quarter-wave plate to become a second reflected light 305, at this time, the second reflected light 305 is a second polarized light, and the second reflected light 305 can enter eyes of a user through the polarization reflection film and the second polarizer, so that the display function of augmented reality is realized.
Further, a part of the light transmitted by the transmissive reflective film in the first reflected light 304 passes through the second quarter-wave plate and becomes the second polarized light, and since the polarization direction of the third polarizer is the first direction, the third polarizer can absorb the part of the light, so that the display content of the display optical system 100 cannot be observed on the outer side of the second optical assembly 40 away from the user, thereby implementing the function of protecting the privacy of the user.
Referring to fig. 5, in some embodiments, after the environmental image sequentially passes through the second polarization element 44, the second polarization conversion element 43, the transmission reflection element 42 and the first polarization conversion element 41, the environmental image is polarized along the second direction and passes through the first optical assembly 10, and finally passes through the first optical assembly 10 and enters the eyes of the user, so that the user observes the real environment.
Specifically, the light of the environmental image is unpolarized light, the second polarizer 44 allows light polarized along the first direction to pass through, after the environmental image passes through the second polarizer 44, the environmental image is polarized along the first direction and passes through the second polarization converter 43, the environmental image is converted into circularly polarized light and then passes through the transmissive reflector 42, the environmental image of the transmissive portion passes through the first polarization converter 41 and then is converted into polarized along the second direction, the polarized reflector 12 can transmit light polarized along the second direction, the environmental image can pass through the polarized reflector 12 and enter the first polarizer 11, the first polarizer 11 can allow light polarized along the second direction to pass through, the environmental light can pass through the first polarizer 11 and then reach the eyes of the user, and the user can observe the environmental information outside the display optical system 100. Further, a part of the environmental image reflected by the transmissive reflective film passes through the second polarization conversion member 43 again to be converted into polarization along the second direction, and then enters the second polarization member 44 to be absorbed by the second polarization member 44, so that no reflection of the environmental image can be realized, and the appearance and use of the environmental image cannot be affected by reflected light when the environmental image is used outdoors.
In an embodiment, referring to fig. 5, the ambient image light is natural light, i.e., unpolarized light, the polarization reflective member 12 includes a polarization reflective film, the first polarization member 11 includes a second polarization plate, the polarization direction of the second polarization plate is the second direction, the first polarization conversion member 41 includes a first quarter-wave plate, the transmission reflective member 42 includes a transmission reflective film, the second polarization conversion member 43 includes a second quarter-wave plate, the second polarization member 44 includes a third polarization plate, the direction of the third polarization plate is the first direction, the polarized light polarized along the first direction is defined as the first polarized light, the polarized light polarized along the second direction is defined as the second polarized light, and the transmission reflective film is capable of reflecting the first polarized light and transmitting the second polarized light.
Further, the ambient image 201 passes through the third polarizer, the ambient image 201 is converted from unpolarized light into first polarized light, then the right-handed circularly polarized light is converted into right-handed circularly polarized light after passing through a second quarter wave plate, the right-handed circularly polarized light is divided into two beams of reflected light and transmitted light after passing through a transmission reflection film, wherein the ratio of transmission and emission is the same as the ratio of the display module 30 when projecting the virtual image, the light of the reflection part is converted into left-handed circular polarized light after reflection, then, the fourth transmitted light 202 passes through the first quarter-wave plate and then becomes the fourth transmitted light 202, the fourth transmitted light 202 is the second polarized light, the fourth transmitted light 202 can pass through the polarizing reflective film and reach the second polarizer, the polarization direction of the second polarizer is the second direction, the fourth transmitted light 202 can pass through the second polarizer and become the fifth transmitted light 203, and the fifth transmitted light 203 enters the eyes of the user, so that the user can observe the environment outside the head-mounted display device 1000.
Furthermore, the environment image reflected by the transmission reflection film is converted into left-handed circularly polarized light from right-handed circularly polarized light, passes through the second quarter wave plate again, is converted into first polarized light from left-handed circularly polarized light, the polarization direction of the third polarizer is the first direction, and the first polarized light is absorbed by the third polarizer when passing through the third polarizer, so that the environment light can not be reflected, and the attractiveness and the use of a user can not be influenced by reflected light when the user uses the environment light outdoors.
In one embodiment, referring to fig. 4, the ratio of transmission and reflection in the transflective member 42 is 1:1, so that 50% of the light is transmitted and 50% of the light is reflected when the light reaches the transflective film, and since the virtual image needs to pass through the projection polarizer 21 and the virtual image is polarized in the first direction, the virtual image is totally reflected by the polarization reflector 12, i.e. 100% of the virtual image is reflected to the second optical element 40, 50% of the virtual image is reflected back to the polarization reflector 12 when 100% of the virtual image reaches the transflective member 42, and the virtual image is polarized in the second direction, 50% of the virtual image can totally pass through the polarization reflector 12 and the first polarizer to reach the eye of the user, so that the optical efficiency of the virtual image of the display optical system 100 is 50%, in the case of the prior art, the first optical element has no polarization reflector 12, the semi-transparent semi-reflective film is adopted, namely, the ratio of transmission and reflection in the semi-transparent semi-reflective film is 1:1, when a virtual image reaches the first optical assembly, 50% of the virtual image is changed into the virtual image which is reflected to the transmission reflecting piece in the second optical assembly, the virtual image which is reflected back from the second optical assembly is 25%, the virtual image passes through the first optical assembly again, and only 12.5% of the virtual image reaches the eyes of a user.
Further, the ratio of transmission to reflection in the transreflective member 42 may also be 1:4, 3:7, 3:2, 2:3, 7:3, 4:1, etc., without limitation. In one embodiment, the reflectivity of the transflective member 42 is greater than the transmissivity, and more of the virtual image can be reflected back to the first optical assembly 10 when the virtual image reaches the transflective member 42, so that the user can see the clearer virtual image, the visual experience of the user can be improved, and the light effects of the virtual image and the environmental image can be balanced.
Referring to fig. 3 again, in some embodiments, the second optical assembly 40 further includes a lens 45, the first polarization conversion element 41 and the transflective element 42 are disposed on a side of the lens 45 close to the first optical assembly 10, the second polarization conversion element 43 and the second polarization element 44 are disposed on a side of the lens 45 far from the first optical assembly 10, it is understood that the first polarization conversion element 41 is on the same side of the lens 45 as the transreflective element 42, the second polarization conversion element 43 and the second polarization element 44 are on the same side of the lens 45, and are not on the same side as the first polarization conversion element 41 and the transreflective element 42, the lens 45 can provide a base for mounting the first polarization conversion member 41, the transflective member 42, the second polarization conversion member 43, and the second polarization member 44, so that the second optical assembly 40 is more stable, and the lens 45 can also modulate the light passing through. The material of the lens 45 may be glass, or may be other transparent materials, which is not limited herein.
Further, in some embodiments, the second optical assembly 40 further includes an inner anti-reflection film 46 and/or an outer anti-reflection film 47, and the first polarization conversion element 41 and the transmissive reflection element 42 are disposed between the inner anti-reflection film 46 and the lens, it can be understood that the inner anti-reflection film 46 is closer to the first optical assembly 10 than the first polarization conversion element 41, specifically, the inner anti-reflection film 46 is disposed at the light exit position of the environmental image of the second optical assembly 40, and meanwhile, the virtual image is reflected by the first optical assembly 10 and reaches the incident position of the second optical assembly 40, so that the inner anti-reflection film 46 can transmit more environmental images or virtual images to the first optical assembly 10, and further, transmit more environmental images or virtual images to the eyes of the user, thereby enhancing the visual experience of the user.
Further, the second polarization conversion element 43 and the second polarization element 44 are disposed between the outer anti-reflection film 47 and the lens 45, it can be understood that the outer anti-reflection film 47 is disposed on a side of the second polarization element 44 away from the second polarization conversion element 43, that is, the outer anti-reflection film 47 is closer to the external environment than the second polarization element 44, the environmental image firstly passes through the outer anti-reflection film 47 and then reaches the second polarization element 44, the outer anti-reflection film 47 can transmit more environmental images to the second polarization sheet, and further, more environmental images are transmitted to the first optical assembly 10 and the eyes of the user, so that the user can more clearly see the external real environmental images.
In one embodiment, the second optical element 40 includes an inner anti-reflection film 46 and an outer anti-reflection film 47, so that the function of increasing light transmission can be realized on both the light incident side and the light emitting side of the second optical element 40, the ratio of the virtual image and the environmental image passing through the second optical element 40 is increased, and the visual experience effect of the user can be improved.
Referring to fig. 4, in some embodiments, the display light of the display 31 is polarized or unpolarized light in a first direction, and the polarization direction of the projection polarizer 21 is the first direction, it can be understood that the display light of the display 31 is a virtual image projected by the display 31, the polarization direction of the projection polarizer 21 is the first direction, when the virtual image is polarized in the first direction, the virtual image can pass through the projection polarizer 21 to the first optical assembly 10, so that the user can view the virtual image, further, when the virtual image projected by the display 31 is unpolarized, the polarization direction of the projection polarizer 21 is the first direction, so that the virtual image is polarized in the first direction after passing through the projection polarizer 21, so that the virtual image can reach the first optical assembly 10 and be reflected by the polarization reflector 12, and finally can reach the eye of the user, so that the user can view the virtual image.
Further, in some embodiments, the display light of the display 31 is polarized along the second direction, the display assembly 30 further includes a half-wave plate (not shown), the half-wave plate is disposed on a side of the projection polarizing member 21 close to the display 31, that is, the half-wave plate is disposed between the projection polarizing member 21 and the display 31, wherein the half-wave plate can change the polarization direction of the polarized light, convert the polarization direction of the polarized light into a direction perpendicular to the original polarization direction, the display light of the display 31, that is, the virtual image projected by the display 31, is polarized along the second direction, the virtual image is converted into a polarization along the first direction by the polarization along the second direction after passing through the half-wave plate, and then after passing through the projection polarizing member 21, the virtual image can be reflected to the second optical assembly 40 when reaching the polarization reflecting member 12, further sequentially passes through the second optical assembly 40 and the first optical assembly 10 to reach the eyes of the user, so that the user can watch the virtual image.
Referring to fig. 4, in an embodiment, the projection optical assembly 20 further includes a first antireflection film 24 and a second antireflection film 25, the first antireflection film 24 is disposed on a side of the first lens 141 opposite to the fresnel lens 22, that is, a side of the first lens 231 close to the display 31, so that the virtual image projected by the display 31 enters more into the fresnel lens 22, and further, more virtual image enters into the eyes of the user, thereby improving the visual experience of the user. The second antireflection film 25 is disposed on the side of the second lens 232 away from the display 31, so that more light can be allowed to enter the first optical assembly 10, and more light can enter the eyes of the user, thereby improving the visual experience of the user.
Further, in an embodiment, the first optical assembly 10 further includes a first optical plate body 13, the first optical plate body 13 is disposed on a side of the first polarizer 11 away from the polarization reflector 12, and the first optical plate body 13 may be glass or other light-permeable material, which is not limited herein. The first polarizer 11 and the polarization reflector 12 can be more stable by the first optical plate body 13, and better function of reflecting and transmitting light can be achieved. Further, a third antireflection film 14 is disposed on a side of the first optical plate body 13 away from the first polarizer 11, and the third antireflection film 14 can increase light entering the eyes of the user, so that the virtual image and the environmental image seen by the user are clearer, and the visual experience of the user is improved.
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 first optical assembly including a first polarizer and a polarizing reflector, the polarizing reflector being configured to reflect light polarized along the first direction and transmit light polarized along the second direction, the first polarizer being configured to allow light polarized along the second direction to pass through, the second direction being perpendicular to the first direction;
a projection optical assembly including a projection polarizer for allowing light polarized in a first direction to pass therethrough; and
the display assembly and the first optical assembly are respectively positioned on two opposite sides of the projection optical assembly, and the display assembly is used for projecting virtual images.
2. The display optical system according to claim 1, further comprising a second optical assembly, the second optical assembly comprising:
the first polarization conversion part is used for converting linearly polarized light and circularly polarized light; and
a transreflective member for transmitting and reflecting light;
after the virtual image reflected by the first optical assembly sequentially passes through the first polarization conversion piece, is reflected by the transmission reflection piece and passes through the first polarization conversion piece, the polarization direction of the virtual image is converted from the first direction to the second direction, and the virtual image polarized along the second direction passes through the first optical assembly.
3. The display optical system according to claim 2, wherein the second optical assembly further comprises:
the second polarization conversion part is used for converting linearly polarized light and circularly polarized light; and
a second polarizer for allowing light polarized in a first direction to pass therethrough;
after the virtual image reflected by the first optical assembly passes through the first polarization conversion element, the transmission reflection element and the second polarization conversion element, the polarization direction of the virtual image is converted from the first direction to the second direction, and the virtual image polarized along the second direction is absorbed by the second polarization element.
4. The display optical system according to claim 3, wherein the ambient image passes through the second polarization member, the second polarization conversion member, the transmissive and reflective member, and the first polarization conversion member in sequence, and then is polarized in the second direction and passes through the first optical assembly.
5. The display optical system according to claim 3, wherein the second optical assembly further includes a lens, the first polarization conversion element and the transflective element are disposed on a side of the lens close to the first optical assembly, and the second polarization conversion element and the second polarizing element are disposed on a side of the lens away from the first optical assembly.
6. The display optical system according to claim 5, wherein the second optical assembly further comprises:
the first polarization conversion part and the transmission reflection part are arranged between the inner antireflection film and the lens; and/or
And the second polarization conversion piece and the second polarization piece are arranged between the outer antireflection film and the lens.
7. The display optical system according to claim 1, wherein the projection optical assembly further includes a fresnel lens disposed on a projection optical path of the virtual image, wherein:
the Fresnel lens is arranged between the display and the display polarizer; or
The display polarizer is disposed between the display and the Fresnel lens.
8. The display optical system according to claim 7, wherein the projection optical assembly further comprises at least two lenses, and the Fresnel lens and the projection polarizer are respectively disposed on two different lenses.
9. The display optical system according to claim 1, wherein the display light of the display is polarized in the first direction or is unpolarized light, and the polarization direction of the display polarizer is the first direction.
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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| CN202010315315.0A CN111399224A (en) | 2020-04-21 | 2020-04-21 | Display optical system and head-mounted display device |
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| CN202010315315.0A CN111399224A (en) | 2020-04-21 | 2020-04-21 | Display optical system and head-mounted display device |
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