CN110208948B - Optical system and virtual reality equipment with same - Google Patents
Optical system and virtual reality equipment with same Download PDFInfo
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- CN110208948B CN110208948B CN201910479425.8A CN201910479425A CN110208948B CN 110208948 B CN110208948 B CN 110208948B CN 201910479425 A CN201910479425 A CN 201910479425A CN 110208948 B CN110208948 B CN 110208948B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
- G02B2027/0114—Head-up displays characterised by optical features comprising device for genereting colour display comprising dichroic elements
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Abstract
The invention discloses an optical system and virtual reality equipment with the same, wherein the optical system sequentially comprises a display unit, a reflective polaroid and a lens group along a light transmission direction, and further comprises a phase delay sheet, wherein the phase delay sheet comprises a first phase delay sheet, and the first phase delay sheet is arranged on one side of the reflective polaroid, which is close to the display unit; the first surface or the second surface of the lens group is provided with a light splitter; incident light rays emitted by the display unit are reflected by the reflective polarizer after passing through the first phase retarder, then emitted to the mirror group after passing through the first phase retarder again, and emitted out of the optical system from the reflective polarizer after being reflected by the beam splitter of the mirror group and passing through the first phase retarder. The invention provides an optical system and virtual reality equipment with the same, and solves the problem that in the prior art, ghost images are easily generated by light rays passing through the optical system of the virtual reality equipment, and the use of the virtual reality equipment by a user is influenced.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical system and virtual reality equipment with the same.
Background
The virtual reality technology is a technology for generating a simulated environment by using a computer to immerse a user in the environment, wherein an optical system of virtual reality equipment is usually realized by adopting a mode of a single lens or a combination of a plurality of lenses, when incident light passes through the optical system, reflected light can be generated on the surface of the lens, and the reflected light passes through the optical system and enters human eyes to form ghost images, so that the use of the virtual reality equipment by the user is influenced.
Disclosure of Invention
The invention provides an optical system and virtual reality equipment with the same, and aims to solve the problem that in the prior art, ghost images are easily generated by light rays passing through the optical system of the virtual reality equipment, and the use of the virtual reality equipment by a user is influenced.
To achieve the above object, the present invention provides an optical system, which comprises a display unit, a reflective polarizer and a mirror assembly in order along a light transmission direction,
the central vertical line of the display unit is intersected with the extension line of the optical axis of the lens group;
the mirror group comprises a first surface close to the reflective polarizer and a second surface far away from the reflective polarizer;
the optical system further comprises a phase retarder, wherein the phase retarder comprises a first phase retarder, and the first phase retarder is arranged on one side, close to the display unit, of the reflective polarizer;
the first surface or the second surface is provided with a light splitter;
incident light rays emitted by the display unit are changed into first linearly polarized light after passing through the first phase delay piece, the polarization direction of the first linearly polarized light is the same as the direction of a reflection axis of the reflection type polaroid, the first linearly polarized light returns to the first phase delay piece after being reflected by the reflection type polaroid and is changed into first circularly polarized light or first elliptically polarized light with the same rotation as the incident light rays, the first circularly polarized light or the first elliptically polarized light irradiates the lens group and is transmitted and reflected by the optical splitter, and transmitted light rays are transmitted to human eyes after exiting the lens group from the second surface; the reflected light is changed into second circularly polarized light or second elliptically polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, and the rotation of the second elliptically polarized light is opposite to that of the first elliptically polarized light; and the second circularly polarized light or the second elliptically polarized light is changed into second linearly polarized light after passing through the first phase delay sheet again, and the second linearly polarized light is transmitted out of the optical system from the reflective polarizing sheet.
Optionally, an angle between the reflection axis of the reflective polarizer and the retardation axis of the first phase retarder is 45 degrees.
Optionally, the first phase retarder is an 1/4 wave plate.
Optionally, the phase retarder comprises a first phase retarder and a second phase retarder; the first phase retardation plate is arranged on one side surface of the reflective polarizer close to the display unit and close to one end of the display unit, and the second phase retardation plate is arranged on one side surface of the reflective polarizer close to the display unit and close to one end of the lens group;
incident light rays emitted by the display unit are changed into first linearly polarized light after passing through the first phase delay piece, the polarization direction of the first linearly polarized light is the same as the direction of a reflection axis of the reflection type polaroid, the first linearly polarized light returns to the first phase delay piece after being reflected by the reflection type polaroid and is changed into first circularly polarized light or first elliptically polarized light with the same rotation as the incident light rays, the first circularly polarized light or the first elliptically polarized light irradiates the lens group and is transmitted and reflected by the optical splitter, and transmitted light rays are transmitted to human eyes after exiting the lens group from the second surface; the reflected light is changed into second circularly polarized light or second elliptically polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, and the rotation of the second elliptically polarized light is opposite to that of the first elliptically polarized light; and the second circularly polarized light or the second elliptically polarized light is changed into second linearly polarized light after passing through the second phase retarder, and the second linearly polarized light is transmitted out of the optical system from the reflective polarizer.
Optionally, the reflection axis of the reflective polarizer and the retardation axis of the first phase retardation plate and the retardation axis of the second phase retardation plate both form an angle of 45 degrees.
Optionally, the first phase retardation plate and the second phase retardation plate are both 1/4 wave plates.
Optionally, an included angle between the reflective polarizer and the display unit is 45 degrees; the included angle between the central vertical line of the reflective polarizer and the optical axis of the lens group is 45 degrees; the display unit and the mirror group are perpendicular to each other.
Optionally, the optical system further includes a third phase retarder disposed between the display unit and the first phase retarder.
Optionally, the optical system further includes an extinction element disposed on a side of the reflective polarizer away from the mirror group.
To achieve the above object, the present application provides a virtual reality device, which is characterized in that the virtual reality device includes an optical system according to any one of the above embodiments.
In the technical scheme provided by the application, the optical system sequentially comprises a display unit, a reflective polarizer and a mirror group along a light transmission direction, wherein the mirror group comprises a first surface close to the reflective polarizer and a second surface far away from the reflective polarizer; the optical system further comprises a phase retarder, wherein the phase retarder comprises a first phase retarder, and the first phase retarder is arranged on one side, close to the display unit, of the reflective polarizer; incident light rays emitted by the display unit are reflected on the reflective polarizer after passing through the first phase retarder, and then pass through the first phase retarder again to be changed into first circularly polarized light which is emitted to the lens group, a light splitter is arranged on the first surface or the second surface, the first circularly polarized light is changed into second circularly polarized light after being reflected by the light splitter, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, the second circularly polarized light is changed into second linearly polarized light after passing through the first phase retarder, the polarization direction of the second linearly polarized light is the same as the direction of the transmission axis of the reflective polarizer, and therefore the second linearly polarized light is transmitted through the reflective polarizer. Therefore, the phenomenon that the reflected light rays enter human eyes again to form ghost images is avoided, and the problem that the ghost images are easily generated by the light rays passing through the optical system of the virtual reality equipment in the prior art and the use of the virtual reality equipment by a user is influenced is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic illustration of the optical path of an embodiment of the optical system of the present invention;
FIG. 2 is a schematic optical path diagram of yet another embodiment of the optical system of the present invention;
fig. 3 is a schematic optical path diagram of another embodiment of the optical system of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
33 | Third |
| 20 | |
40 | |
| 30 | |
41 | |
| 31 | First phase retarder | 42 | |
| 32 | Second |
50 | Extinction element |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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 such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an optical system and virtual reality equipment with the same.
Referring to fig. 1 to 3, the optical system sequentially includes a display unit 10, a reflective polarizer 20 and a mirror assembly 40 along a light transmission direction,
the central perpendicular line of the display unit 10 intersects with the extension line of the optical axis of the mirror group 40;
the mirror array 40 comprises a first surface 41 proximate to the reflective polarizer 20 and a second surface 42 distal to the reflective polarizer 20;
the optical system further comprises a phase retarder 30, wherein the phase retarder 30 is arranged on one side of the reflective polarizer 20 close to the display unit 10;
the first surface 41 or the second surface 42 is provided with a light splitter;
incident light emitted by the display unit 10 passes through the phase retarder 30 and then is changed into first linearly polarized light, the polarization direction of the first linearly polarized light is the same as the direction of the reflection axis of the reflective polarizer 20, the first linearly polarized light is reflected by the reflective polarizer 20 and then returns to the phase retarder 30, and is changed into first circularly polarized light or first elliptically polarized light with the same rotation as the incident light, the first circularly polarized light or the first elliptically polarized light is emitted to the lens group 40, is transmitted and reflected by the light splitter, and the transmitted light is emitted out of the lens group 40 from the second surface 42 and then is transmitted to human eyes; the reflected light is changed into second circularly polarized light or second elliptically polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, and the rotation of the second elliptically polarized light is opposite to that of the first elliptically polarized light; the second circularly polarized light or the second elliptically polarized light passes through the phase retarder 30 again and then becomes second linearly polarized light, and the second linearly polarized light is transmitted from the reflective polarizer 20 and exits the optical system.
In the technical solution provided in the present application, the optical system sequentially includes a display unit 10, a reflective polarizer 20, and a mirror group 40 along a light transmission direction, where the mirror group 40 includes a first surface 41 close to the reflective polarizer 20 and a second surface 42 far from the reflective polarizer 20; the optical system further comprises a phase retarder 30, wherein the phase retarder 30 is arranged on one side of the reflective polarizer 20 close to the display unit 10; the incident light emitted by the display unit 10 is reflected by the reflective polarizer 20 after passing through the retardation film 30, and then passes through the retardation film 30 again to become first circularly polarized light, and then the first circularly polarized light is emitted to the mirror group 40, the first surface 41 or the second surface 42 is provided with a beam splitter, the first circularly polarized light is reflected by the beam splitter to become second circularly polarized light, the handedness of the second circularly polarized light is opposite to that of the first circularly polarized light, the second circularly polarized light is changed into the second linearly polarized light after passing through the retardation film 30, and the polarization direction of the second linearly polarized light is the same as the direction of the transmission axis of the reflective polarizer 20, so that the second linearly polarized light is transmitted through the reflective polarizer 20. Therefore, the phenomenon that the reflected light rays enter human eyes again to form ghost images is avoided, and the problem that the ghost images are easily generated by the light rays passing through the optical system of the virtual reality equipment in the prior art and the use of the virtual reality equipment by a user is influenced is solved.
In a preferred embodiment, the light splitter is a light splitting film, specifically, the light splitting film is a transflective film, and a ratio of transmittance to reflectance of the transflective film is 1:1, it is understood that the light splitting ratio of the light splitter is not limited thereto, and in other embodiments, the ratio of transmittance to reflectance of the light splitter may be 4:6 or 3: 7. It is understood that the beam splitter may also be a light splitting element, which may be a light splitting sheet or other optical element capable of splitting light.
Referring to fig. 1, in some alternative embodiments, the retardation plate 30 includes a first retardation plate 31, specifically, the first retardation plate 31 is disposed to cover a side surface of the reflective polarizer 20 close to the display unit 10, and the first surface 41 is provided with a beam splitter. Incident light emitted by the display unit 10 passes through the first phase retarder 31 and then is changed into first linearly polarized light, the polarization direction of the first linearly polarized light is the same as the direction of the reflection axis of the reflective polarizer 20, the first linearly polarized light is reflected by the reflective polarizer 20 and then returns to the first phase retarder 31, the first linearly polarized light is changed into first circularly polarized light or first elliptically polarized light with the same rotation as the incident light, the first circularly polarized light or the first elliptically polarized light is emitted to the mirror group 40 and is transmitted and reflected by the beam splitter, and the transmitted light is emitted out of the mirror group 40 from the second surface 42 and then is transmitted to human eyes; the reflected light is changed into second circularly polarized light or second elliptically polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, and the rotation of the second elliptically polarized light is opposite to that of the first elliptically polarized light; the second circularly polarized light or the second elliptically polarized light passes through the first phase retarder 31 again and then becomes second linearly polarized light, and the polarization direction of the second linearly polarized light is the same as the transmission axis direction of the reflective polarizer 20, so that the second linearly polarized light is transmitted out of the optical system from the reflective polarizer 20.
In a preferred embodiment, the angle between the reflection axis of the reflective polarizer 20 and the first retarder 31 is 45 degrees. Specifically, when the included angle between the reflection axis of the reflective polarizer 20 and the first phase retarder 31 is 45 degrees, the polarization state of the first linearly polarized light is changed from linearly polarized light to circularly polarized light after the first linearly polarized light reflected by the reflective polarizer 20 passes through the first phase retarder 31, when the reflection axis of the reflective polarizer 20 and the retardation axis of the first phase retarder 31 are not 45 degrees, the polarization state of the first linearly polarized light is changed from linearly polarized light to elliptically polarized light, the elliptically polarized light is changed into linearly polarized light again when returning to the reflective polarizer 20 after being reflected by the beam splitter, and since the reflection axis of the reflective polarizer 20 and the retardation axis of the first phase retarder 31 are not 45 degrees, the linearly polarized light changed into elliptically polarized light cannot completely transmit through the reflective polarizer 20, there is a portion of the light reflected by the reflective polarizer 20 that eventually tends to return to the mirror array 40 and create ghost images that affect the look and feel of the user.
Preferably, the first phase retarder 31 is a first 1/4 wave plate, in a specific embodiment, the central wavelength of the first 1/4 wave plate is equal to the wavelength of the incident light, the included angle between the fast axis or the slow axis of the first 1/4 wave plate and the polarization direction of the incident light is 45 degrees, specifically, the incident light is right-handed circularly polarized light, the incident light passes through the first 1/4 wave plate and becomes the first linearly polarized light, the polarization direction of the first linearly polarized light is the same as the reflection axis direction of the reflective polarizer 20, therefore, the first linearly polarized light is reflected by the reflective polarizer 20, the first linearly polarized light passes through the first 1/4 wave plate again and becomes first circularly polarized light, the first circularly polarized light is right-handed circularly polarized light, and the first circularly polarized light is reflected by the beam splitter and becomes the second circularly polarized light, the second circularly polarized light is left-handed circularly polarized light, the second circularly polarized light is changed into second linearly polarized light after passing through the first 1/4 wave plate again, the polarization direction of the second linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light, and the second circularly polarized light is the same as the transmission axis direction of the reflective polarizing plate 20, so that the second linearly polarized light penetrates through the reflective polarizing plate 20 and is not transmitted along an original optical path, and the problem of ghost image caused by reflected light in the optical system is avoided.
Referring to fig. 2, in some alternative embodiments, the phase retarder 30 includes a first phase retarder 31 and a second phase retarder 32. Specifically, the first phase retarder 31 is disposed on a side surface of the reflective polarizer 20 close to the display unit 10 and is disposed close to one end of the display unit 10, the second phase retarder 32 is disposed on a side surface of the reflective polarizer 20 close to the display unit 10 and is disposed close to one end of the mirror group 40, and the second surface 42 is disposed with a beam splitter.
The incident light emitted from the display unit 10 passes through the first phase retardation plate 31, is reflected by the reflective polarizer 20, passes through the first phase retardation plate 31 again, is emitted to the mirror group 40, and is reflected by the beam splitter of the mirror group 40, passes through the second phase retardation plate 32, and is emitted from the reflective polarizer 20 to the optical system.
In a preferred embodiment, the angles between the reflection axis of the reflective polarizer 20 and the first phase retarder 31 and the second phase retarder 32 are both 45 degrees. Specifically, the first phase retarder 31 and the second phase retarder 32 are both parallel to the reflective polarizer 20, when an included angle between the reflection axis of the reflective polarizer 20 and the first phase retarder 31 and the second phase retarder 32 is 45 degrees, the polarization state of the first linearly polarized light reflected by the reflective polarizer 20 is changed from linearly polarized light to circularly polarized light after passing through the first phase retarder 31, when the reflection axis of the reflective polarizer 20 and the retardation axis of the first phase retarder 31 are not 45 degrees, the polarization state of the first linearly polarized light is changed from linearly polarized light to elliptically polarized light, and the elliptically polarized light is changed again when passing through the second phase retarder 32 and returning to the reflective polarizer 20 after being reflected by the beam splitter, since the reflection axis of the reflective polarizer 20 and the retardation axis of the first retardation film 31 are not at 45 degrees, the linearly polarized light converted from the elliptically polarized light cannot completely transmit through the reflective polarizer 20, so that there is a part of the light reflected by the reflective polarizer 20, and finally, the light is easy to return to the mirror assembly 40, and a ghost image is formed, which affects the user's appearance.
In a preferred embodiment, the first phase retardation plate 31 and the second phase retardation plate 32 are both 1/4 wave plates. Specifically, the central wavelength of first 1/4 wave plate with incident light's wavelength equals, the central wavelength of second 1/4 wave plate with incident light's wavelength equals, the fast axle or the slow axle of first 1/4 wave plate with incident light's polarization direction's contained angle is 45 degrees, the fast axle or the slow axle of second 1/4 wave plate with incident light's polarization direction's contained angle is 45 degrees, first 1/4 wave plate with second 1/4 wave plate is used for becoming circular polarization light with linear polarization light.
In some alternative embodiments, the reflective polarizer 20 is angled at 45 degrees to the display cell 10; the included angle between the central perpendicular line of the reflective polarizer 20 and the optical axis of the mirror group 40 is 45 degrees; the display unit 10 and the mirror group 40 are perpendicular to each other. In a specific embodiment, the incident angle and the reflection angle of the incident light emitted by the display unit 10 on the reflective polarizer 20 are both 45 degrees, and the light transmission direction of the first circularly polarized light is the same as the optical axis direction of the mirror group 40, so as to ensure that the first circularly polarized light can be returned to the reflective polarizer 20 along the original opposite direction by the beam splitter when being transmitted to the mirror group 40. When the included angle between the reflective polarizer 20 and the display unit 10 is not 45, the relative positions of the display unit 10, the reflective polarizer 20 and the mirror group 40 need to be precisely adjusted, so that it is ensured that the incident light emitted by the display unit 10 can be transmitted to the mirror group 40 after being reflected by the reflective polarizer 20, and the assembly difficulty of the optical system is increased.
Referring to fig. 1 to fig. 3, in some alternative embodiments, the optical system further includes an extinction element 50, where the extinction element 50 is disposed on a side of the reflective polarizer 20 away from the mirror group 40, specifically, to avoid that the second linearly polarized light is reflected again to be transmitted through the reflective polarizer 20 after passing through the reflective polarizer 20, the extinction element 50 is disposed on a side of the reflective polarizer 20 away from the mirror group 40, and the extinction element 50 is configured to absorb or scatter the second linearly polarized light passing through the reflective polarizer 20, in a preferred embodiment, the extinction element 50 is a black curtain. It is understood that the light extinction element 50 is not limited thereto, and in other embodiments, the light extinction element 50 may be an absorbing film or an anti-glare glass or a black coating.
Referring to fig. 3, in some optional embodiments, the retarder 30 further includes a third retarder 33, and the third retarder 33 is disposed between the display unit 10 and the first retarder 31. Specifically, when the incident light emitted by the display unit 10 is linearly polarized light, in order to ensure that the incident light can eliminate or reduce the influence of ghost after passing through the optical system, the third phase retarder 33 is disposed between the display unit 10 and the first phase retarder 31, and the third phase retarder 33 is used for converting the incident light emitted by the display unit 10 from the linearly polarized light to circularly polarized light or elliptically polarized light, so as to ensure the ghost eliminating effect of the optical system. In a preferred embodiment, an angle between the retardation axis of the third phase retarder 33 and the polarization direction of the incident light is 45 degrees, so that the incident light is converted into circularly polarized light.
In some optional embodiments, the third phase retarder is a third 1/4 wave plate, in specific embodiments, a central wavelength of the third 1/4 wave plate is equal to a wavelength of the incident light, an included angle between a fast axis or a slow axis of the third 1/4 wave plate and a polarization direction of the incident light is 45 degrees, and when the incident light is linearly polarized light, the incident light changes from linearly polarized light to circularly polarized light after passing through the third 1/4 wave plate.
In some optional embodiments, the optical system further includes a beam splitter (not shown) disposed parallel to the reflective polarizer 20, and in particular, the beam splitter is connected to the reflective polarizer 20, and is configured to support the reflective polarizer 20 and position the reflective polarizer 20.
The present invention further provides a virtual reality device, where the virtual reality device includes the optical system according to any of the above embodiments, and the specific structure of the optical system refers to the above embodiments, and since the optical system adopts all technical solutions of all the above embodiments, the optical system at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated here.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An optical system comprising, in order along a light transmission direction, a display unit, a reflective polarizer and a mirror assembly,
the central vertical line of the display unit is intersected with the extension line of the optical axis of the lens group;
the mirror group comprises a first surface close to the reflective polarizer and a second surface far away from the reflective polarizer;
the optical system further comprises a phase retarder, wherein the phase retarder comprises a first phase retarder, the first phase retarder is an 1/4 wave plate, and the first phase retarder is arranged on one side, close to the display unit, of the reflective polarizer;
the first surface or the second surface is provided with a light splitter;
incident light rays emitted by the display unit are changed into first linearly polarized light after passing through the first phase delay piece, the polarization direction of the first linearly polarized light is the same as the direction of a reflection axis of the reflection type polaroid, the first linearly polarized light returns to the first phase delay piece after being reflected by the reflection type polaroid and is changed into first circularly polarized light or first elliptically polarized light with the same rotation as the incident light rays, the first circularly polarized light or the first elliptically polarized light irradiates the lens group and is transmitted and reflected by the optical splitter, and transmitted light rays are transmitted to human eyes after exiting the lens group from the second surface; the reflected light is changed into second circularly polarized light or second elliptically polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, and the rotation of the second elliptically polarized light is opposite to that of the first elliptically polarized light; and the second circularly polarized light or the second elliptically polarized light is changed into second linearly polarized light after passing through the first phase delay sheet again, and the second linearly polarized light is transmitted out of the optical system from the reflective polarizing sheet.
2. The optical system of claim 1, wherein the reflective axis of the reflective polarizer is at a 45 degree angle to the retardation axis of the first phase retarder.
3. The optical system of claim 1, wherein the reflective polarizer is angled at 45 degrees to the display cell; the included angle between the central vertical line of the reflective polarizer and the optical axis of the lens group is 45 degrees; the display unit and the mirror group are perpendicular to each other.
4. The optical system of claim 1, further comprising a third phase retarder disposed between the display unit and the first phase retarder.
5. An optical system as claimed in any one of claims 1 to 4, characterized in that the optical system further comprises an extinction element arranged on the side of the reflective polarizer remote from the mirror group.
6. An optical system comprising, in order along a light transmission direction, a display unit, a reflective polarizer and a mirror assembly,
the central vertical line of the display unit is intersected with the extension line of the optical axis of the lens group;
the mirror group comprises a first surface close to the reflective polarizer and a second surface far away from the reflective polarizer;
the optical system further comprises a phase retarder, wherein the phase retarder comprises a first phase retarder and a second phase retarder; the first phase retardation plate is arranged on one side surface of the reflective polarizer close to the display unit and close to one end of the display unit, and the second phase retardation plate is arranged on one side surface of the reflective polarizer close to the display unit and close to one end of the lens group;
the first surface or the second surface is provided with a light splitter;
incident light rays emitted by the display unit are changed into first linearly polarized light after passing through the first phase delay piece, the polarization direction of the first linearly polarized light is the same as the direction of a reflection axis of the reflection type polaroid, the first linearly polarized light returns to the first phase delay piece after being reflected by the reflection type polaroid and is changed into first circularly polarized light or first elliptically polarized light with the same rotation as the incident light rays, the first circularly polarized light or the first elliptically polarized light irradiates the lens group and is transmitted and reflected by the optical splitter, and transmitted light rays are transmitted to human eyes after exiting the lens group from the second surface; the reflected light is changed into second circularly polarized light or second elliptically polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, and the rotation of the second elliptically polarized light is opposite to that of the first elliptically polarized light; and the second circularly polarized light or the second elliptically polarized light is changed into second linearly polarized light after passing through the second phase retarder, and the second linearly polarized light is transmitted out of the optical system from the reflective polarizer.
7. The optical system of claim 6, wherein the reflection axis of the reflective polarizer is at 45 degrees to both the retardation axis of the first phase retarder and the retardation axis of the second phase retarder.
8. The optical system of claim 6, wherein the first phase retarder and the second phase retarder are 1/4 wave plates.
9. An optical system as claimed in any one of claims 6 to 8, further comprising an extinction element disposed on a side of the reflective polarizer remote from the mirror array.
10. A virtual reality device, characterized in that it comprises an optical system according to any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910479425.8A CN110208948B (en) | 2019-06-03 | 2019-06-03 | Optical system and virtual reality equipment with same |
| PCT/CN2019/128797 WO2020244210A1 (en) | 2019-06-03 | 2019-12-26 | Optical system and virtual reality device having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910479425.8A CN110208948B (en) | 2019-06-03 | 2019-06-03 | Optical system and virtual reality equipment with same |
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| CN110208948B (en) * | 2019-06-03 | 2020-11-24 | 歌尔光学科技有限公司 | Optical system and virtual reality equipment with same |
| CN111221130B (en) * | 2020-03-20 | 2022-03-04 | 维沃移动通信有限公司 | Optical system and near-eye display apparatus |
| CN111474715A (en) * | 2020-04-23 | 2020-07-31 | 歌尔股份有限公司 | Optical system and augmented reality device |
| CN111638602B (en) * | 2020-07-03 | 2022-05-24 | 维沃移动通信有限公司 | Optical device and near-to-eye display apparatus |
| CN114077051B (en) * | 2020-08-13 | 2023-06-06 | 京东方科技集团股份有限公司 | Near-to-eye display device |
| CN113485012A (en) * | 2021-06-29 | 2021-10-08 | 京东方科技集团股份有限公司 | Folding light path structure, optical imaging system and virtual reality equipment |
| CN114371557B (en) * | 2022-01-17 | 2024-02-09 | 惠州Tcl移动通信有限公司 | VR optical system |
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| CN1485648A (en) * | 2002-09-27 | 2004-03-31 | 株式会社尼康 | Image printing system using cellular phone with camera |
| EP1610567A1 (en) * | 2004-06-24 | 2005-12-28 | Lg Electronics Inc. | Illumination system for a single panel projection display apparatus. |
| CN108828774A (en) * | 2018-07-02 | 2018-11-16 | 京东方科技集团股份有限公司 | Virtual reality shows equipment |
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| JP2000330196A (en) * | 1999-05-18 | 2000-11-30 | Nikon Corp | Color synthesizing optical system and projection type display device equipped with the system |
| CN102688016B (en) * | 2012-03-07 | 2015-12-02 | 北京理工大学 | A kind of fundus camera |
| CN208818938U (en) * | 2018-09-10 | 2019-05-03 | 太若科技(北京)有限公司 | AR Optical devices and wearable AR equipment |
| CN110208948B (en) * | 2019-06-03 | 2020-11-24 | 歌尔光学科技有限公司 | Optical system and virtual reality equipment with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1485648A (en) * | 2002-09-27 | 2004-03-31 | 株式会社尼康 | Image printing system using cellular phone with camera |
| EP1610567A1 (en) * | 2004-06-24 | 2005-12-28 | Lg Electronics Inc. | Illumination system for a single panel projection display apparatus. |
| CN108828774A (en) * | 2018-07-02 | 2018-11-16 | 京东方科技集团股份有限公司 | Virtual reality shows equipment |
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