CN214151259U - Optical imaging system and head-mounted display device - Google Patents
Optical imaging system and head-mounted display device Download PDFInfo
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- CN214151259U CN214151259U CN202120503144.4U CN202120503144U CN214151259U CN 214151259 U CN214151259 U CN 214151259U CN 202120503144 U CN202120503144 U CN 202120503144U CN 214151259 U CN214151259 U CN 214151259U
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Abstract
The utility model provides an optical imaging system and head-mounted display equipment, the optical imaging system includes a 1/4 wave plate for converting the polarized light of a first type into circularly polarized light; the semi-transparent semi-reflecting mirror is used for transmitting one part of circularly polarized light and reflecting the other part of circularly polarized light; a second 1/4 wave plate for converting the circularly polarized light transmitted by the half mirror into a second type polarized light and for converting the circularly polarized light reflected by the half mirror into a first type polarized light; the light splitting unit is provided with an incidence surface, a first light splitting surface and a second light splitting surface, the first light splitting surface and the second light splitting surface are symmetrically arranged on two sides of a binocular central axis, and the first light splitting surface and the second light splitting surface are both configured to transmit first type polarized light and reflect second type polarized light; therefore, the distance from the display to human eyes is greatly shortened, and the volume of the optical imaging system is reduced.
Description
Technical Field
The utility model relates to an optical imaging technical field, concretely relates to optical imaging system and head-mounted display device.
Background
When the human eyes observe the real world, stereoscopic vision is generated by means of binocular parallax. According to this principle, researchers have developed head-mounted display devices, such as VR (Virtual Reality) products and AR (Augmented Reality) products, to implement 3D display.
In the head-mounted display equipment in the prior art, the structural design of the optical path imaging system is not mature, and the distance from a screen to human eyes is long, so that the volume of the head-mounted display equipment is overlarge, and the space waste is serious.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optical imaging system and head-mounted display device to solve the screen that prior art exists and longer, cause the volume too big to the distance of people's eye, the extravagant serious problem in space.
In view of the above object, the present application provides, in a first aspect, an optical imaging system including:
a first 1/4 wave plate for converting first type polarized light into circularly polarized light;
the semi-transparent semi-reflecting mirror is used for transmitting one part of circularly polarized light and reflecting the other part of circularly polarized light;
a second 1/4 wave plate for converting the circularly polarized light transmitted by the half mirror into a second type polarized light and converting the circularly polarized light reflected by the half mirror into a first type polarized light;
a light splitting unit having an incident surface, a first light splitting surface and a second light splitting surface, the first light splitting surface and the second light splitting surface being symmetrically disposed on both sides of a binocular central axis, the first light splitting surface and the second light splitting surface being configured to transmit the first type polarized light and reflect the second type polarized light,
the first type polarized light is converted into second type polarized light after sequentially passing through the first 1/4 wave plate, the half mirror and the second 1/4 wave plate, the second type polarized light enters the light splitting unit through an incident surface, after the reflection action of the first light splitting surface and the second light splitting surface, the second type polarized light is converted into circularly polarized light through the second 1/4 wave plate again, the circularly polarized light is converted into the first type polarized light after being reflected by the half mirror and passing through the second 1/4 wave plate again, and the first type polarized light is finally transmitted to the observation position of a human eye through the second light splitting surface.
Further, the optical imaging system includes:
and a display for emitting polarized light to the first 1/4 wave plate, wherein the display is provided in two and arranged corresponding to the observation position of human eyes, and the unpolarized light emitting display can obtain polarized light by adding a polarizing plate.
Further, the optical imaging system includes:
the display amplification units are symmetrically distributed on two sides of the binocular central axis; and when the binocular central axis is a binocular front-view screen, the normal line of the midpoint position of the connecting line of the centers of the two eyes is formed.
Further, the optical imaging system includes:
a display magnification unit disposed between the display and the first 1/4 waveplate.
Further, the optical imaging system includes:
and the display amplifying unit is arranged between the first 1/4 wave plates and between the half-mirror.
Further, the first light splitting surface and the second light splitting surface are arranged to be a plane.
Further, the first light splitting surface and the second light splitting surface are curved surfaces.
Further, the semi-transparent semi-reflecting mirror is a plane mirror or a curved mirror.
Further, the first type polarized light is P-type polarized light, and the second type polarized light is S-type polarized light;
alternatively, the first and second electrodes may be,
the first type polarized light is S-type polarized light, and the second type polarized light is P-type polarized light.
In a second aspect, the present application provides a head-mounted display device comprising the optical imaging system described above.
Adopt above-mentioned technical scheme, for prior art, the optical imaging system and head mounted display device's that this application provided technical effect has:
in the optical imaging system that this application provided, the display sends first type polarized light, and first type polarized light converts second type polarized light into after first 1/4 wave plate, semi-transparent semi-reflecting mirror and second 1/4 wave plate in proper order, and second type polarized light gets into the beam splitting unit through the incident surface, after the reflex action of first beam splitting surface, second beam splitting surface in proper order, second type polarized light becomes circular polarization light through second 1/4 wave plate once more, the circular polarization light warp behind the semi-transparent semi-reflecting mirror process once more the second 1/4 wave plate converts first type polarized light into, and first type polarized light is at last through the transmission of second beam splitting surface to the position is observed to the people's eye. The light path is reflected and folded for many times by the combined action of the first 1/4 wave plate, the half-transmitting and half-reflecting mirror, the second 1/4 wave plate and the light splitting unit and by utilizing the polarization principle; therefore, the distance from the display to human eyes is greatly shortened, and the volume of the optical imaging system is greatly reduced.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical imaging system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of right-eye imaging in an optical imaging system according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of left eye imaging in an optical imaging system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical imaging system provided in the second embodiment of the present invention;
fig. 5 is a schematic structural diagram of an optical imaging system provided in the third embodiment of the present invention;
fig. 6 is another schematic structural diagram of an optical imaging system provided in the third embodiment of the present invention;
fig. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention;
fig. 8 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.
Reference numerals: the display comprises a display 1, a first 1/4 wave plate 2-1, a second 1/4 wave plate 2-2, a half-mirror 3-3, a first light splitting surface 4-1, a second light splitting surface 4-2, a display amplification unit 5 and a central axis 6.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
In order to solve the problem that the size of a head-mounted display device is increased due to a long distance from a screen to human eyes in the prior art, as shown in fig. 1, an optical imaging system provided by an embodiment of the present application includes: the display comprises two displays 1, a first 1/4 wave plate 2-1, a half-mirror 3, a second 1/4 wave plate 2-2 and a light splitting unit;
wherein, the two displays 1 are respectively arranged corresponding to the observation positions of the left and right eyes and used for emitting polarized light;
a first 1/4 wave plate 2-1 arranged on the light exit side of the display 1 for converting the first type of polarized light into circularly polarized light;
the half-mirror 3 is arranged on the light outlet side of the first 1/4 wave plate 2-1 and is used for transmitting one part of circularly polarized light and reflecting the other part of circularly polarized light, for example, transmitting 50% of circularly polarized light and reflecting the other 50% of circularly polarized light;
a second 1/4 wave plate 2-2 disposed on the light exit side of the half mirror 3 for converting the circularly polarized light transmitted by the half mirror 3 into a second type polarized light and converting the circularly polarized light reflected by the half mirror 3 into a first type polarized light;
the light splitting unit is arranged on the light outgoing side of the second 1/4 wave plate 2-2 and is provided with an incident surface, a first light splitting surface 4-1 and a second light splitting surface 4-2, the first light splitting surface 4-1 and the second light splitting surface 4-2 are symmetrically arranged on two sides of a binocular central axis 6, and the first light splitting surface 4-1 and the second light splitting surface 4-2 are both configured to transmit the first type of polarized light and reflect the second type of polarized light; it should be noted that, when the binocular central axis 6 is a binocular front view screen, the normal line of the midpoint position of the connecting line of the centers of the two eyes.
Alternatively, the first light-splitting planes 4-1 may be symmetrically arranged at an angle of 45 degrees.
The 1/4 wave plate in this embodiment may also be referred to as a 90 degree phase retarder. 1/4 the waveplate is made of a birefringent material. When the light vector of the linearly polarized light forms +/-45 degrees with the fast axis or the slow axis of the 1/4 wave plate, the light passing through the 1/4 wave plate is the circularly polarized light; on the contrary, when the circularly polarized light passes through 1/4 wave plate, the circularly polarized light becomes linearly polarized light.
In this embodiment, the type of the Display 1 is not limited, and for example, the Display may be any one of an LCD (liquid crystal Display, liquid crystal Display 1) Display, an OLED (Organic Light-Emitting Diode) Display, a Micro OLED microdisplay 1, and a Mini LED microdisplay; but also a DLP (Digital Light Processing) display; but also LCOS (Liquid Crystal on silicon ) displays and the like. In addition, the display may be a flexible screen or a rigid screen (i.e., a non-flexible screen). In practical application, the light emitting type of the display is unpolarized light, and a polarizer can be added in front of the display to obtain the polarized light.
In this embodiment, the half mirror 3 is an imaging lens that allows incident light to partially transmit and partially reflect. For example, a film with 50% transmission and reflectance. Wherein, transmission is an emergence phenomenon that incident light passes through an object through refraction. The object to be transmitted is a transparent or translucent body, such as glass or a color filter. If the transparent body is colorless, most of the light is transmitted through the object except for a few light that is reflected. In order to express the degree of light transmitted by an object, the transmittance (transmittance) is generally expressed by the ratio of the intensity of light after transmission to the intensity of light of incident light after the incident light transmits through the film. The ratio of the intensity of the light reflected back to the intensity of the incident light is indicative of the reflectivity (reflectivity).
It should be noted that the half mirror 3 is used to transmit half of the incident light and reflect the other half. The effective optical path of the present application is only illustrated in the figure, and in practical application, the half-mirror 3 is used for transmitting part of the circularly polarized light transmitted by the first 1/4 wave plate 2-1, and it is understood that part 1/4 of the circularly polarized light is reflected by the half-mirror 3. The half mirror 3 is also used for reflecting part of the circularly polarized light transmitted by the second 1/4 wave plate 2-2, which can be understood as part of the circularly polarized light transmitted by the second 1/4 wave plate 2-2, and is transmitted by the half mirror.
In this embodiment, the first type polarized light is P-type polarized light, and the second type polarized light is S-type polarized light; or the first type polarized light is S-type polarized light, and the second type polarized light is P-type polarized light.
The working principle of the optical imaging system provided by the embodiment of the application is as follows:
the display 1 emits first-type polarized light, the first-type polarized light is converted into second-type polarized light after sequentially passing through a first 1/4 wave plate 2-1, a half-mirror 3 and a second 1/4 wave plate 2-2, the second-type polarized light enters a light splitting unit through an incident surface, after sequentially passing through a first light splitting surface 4-1 and a second light splitting surface 4-2, the second-type polarized light is converted into circularly polarized light through the second 1/4 wave plate 2-2 again, the circularly polarized light is converted into the first-type polarized light through the second 1/4 wave plate 2-2 after being reflected by the half-mirror 3, and the first-type polarized light is finally transmitted to a human eye observation position through the second light splitting surface 4-2. In the above embodiment, the first 1/4 wave plate 2-1, the half mirror 3, the second 1/4 wave plate 2-2 and the light splitting unit are combined together, and the light path is reflected and folded for multiple times by using the polarization principle; thereby greatly shortening the distance from the display 1 to human eyes and reducing the volume of the optical imaging system.
The present invention will be described with reference to specific examples.
The right eye optical path is shown in fig. 2;
assuming that the light emitted by the display 1 is P-type polarized light, after the P-type polarized light is transmitted by the first 1/4 wave plate 2-1 and becomes circularly polarized light, the circularly polarized light is incident on the half mirror 3, wherein the circularly polarized light is reflected by 50% and transmitted by 50%, the circularly polarized light with 50% transmission is converted into S-type polarized light after passing through the second 1/4 wave plate 2-2, the S-type polarized light is incident on the first light splitting surface 4-1, reflected to the second light splitting surface 4-2 by the first light splitting surface 4-1, and then reflected to the second 1/4 wave plate 2-2 by the second light splitting surface 4-2, it should be noted that the first light splitting surface 4-1 and the second light splitting surface 4-2 both reflect S-type polarized light and transmit P-type polarized light, the S-type polarized light is reflected by the second light splitting surface 4-2, the circularly polarized light is incident into the second 1/4 wave plate 2-2 again and becomes circularly polarized light, and then enters the half mirror 3, wherein the circularly polarized light is reflected by 50 percent, the other circularly polarized light is transmitted by 50 percent, the circularly polarized light reflected by 50 percent is transmitted by the second 1/4 wave plate 2-2 and is converted into P-type polarized light, and the P-type polarized light enters the right eye after transmitting the second light splitting surface 4-2;
here, when the display 1 emits S-polarized light, the first light splitting surface 4-1 and the second light splitting surface 4-2 reflect P-polarized light and transmit S-polarized light.
The left eye light path is shown in fig. 3;
assuming that the light emitted by the display 1 is P-type polarized light, after the P-type polarized light is transmitted by the first 1/4 wave plate 2-1 and becomes circularly polarized light, the circularly polarized light is incident on the half mirror 3, wherein the circularly polarized light is reflected by 50% and transmitted by 50%, the circularly polarized light with 50% transmission is converted into S-type polarized light after passing through the second 1/4 wave plate 2-2, the S-type polarized light is incident on the second light splitting surface 4-2, reflected to the first light splitting surface 4-1 by the second light splitting surface 4-2, and then reflected to the second 1/4 wave plate 2-2 by the first light splitting surface 4-1, it should be noted that the first light splitting surface 4-1 and the second light splitting surface 4-2 both reflect S-type polarized light and transmit P-type polarized light, the S-type polarized light is reflected by the first light splitting surface 4-1, the circularly polarized light enters the half mirror 3 again after entering the second 1/4 wave plate 2-2, wherein the circularly polarized light is reflected by 50% and transmitted by 50%, the circularly polarized light reflected by 50% is transmitted by the second 1/4 wave plate 2-2 and converted into P-type polarized light, and the P-type polarized light enters the left eye after transmitting the first light splitting surface 4-1;
here, when the display 1 emits S-polarized light, the first light splitting surface 4-1 and the second light splitting surface 4-2 reflect P-polarized light and transmit S-polarized light.
Example two
As shown in fig. 4, the present embodiment provides an optical imaging system, which is further improved on the basis of the structure of the optical imaging system provided in the first embodiment, specifically:
the optical imaging system further includes:
the display amplification units 5 are symmetrically distributed on two sides of the binocular central axis 6; the display amplification unit 5 is used for carrying out display amplification and aberration correction on the light rays emitted by the display 1, and the embodiment has the characteristics that binocular amplification display can be realized only by one group of display amplification units 5, so that devices and cost are saved; note that, in order to make the images viewed through the two eyes uniform, the display enlarging units 5 need to be symmetrically distributed about the central axis 6.
The display magnification unit may be a spherical surface, an aspherical surface, a free-form surface, a hologram lens, a liquid crystal lens, or the like.
EXAMPLE III
As shown in fig. 5 and fig. 6, the present embodiment provides an optical imaging system, which is further improved on the basis of the structure of the optical imaging system provided in the first embodiment, specifically:
the optical imaging system further includes:
and the display amplifying unit 5, wherein the display amplifying unit 5 is arranged at a position between the display 1 and the first 1/4 wave plate 2-1. For example, when two displays 1 are provided, one display amplification unit 5 is configured on the light emitting side of each display 1 to realize binocular amplified display, and the working principle and the function of the display amplification unit 5 are not described again here.
In addition, in this embodiment, referring to fig. 5, the first light splitting surface 4-1 and the second light splitting surface 4-2 may be flat surfaces, and referring to fig. 6, the first light splitting surface 4-1 and the second light splitting surface 4-2 may also be curved surfaces.
Example four
The embodiment provides an optical imaging system, which is further improved on the basis of the structure of the optical imaging system provided in the first embodiment, and specifically comprises:
as shown in fig. 7, the optical imaging system further includes: and two display amplifying units 5 are arranged between the first 1/4 wave plates 2-1 and between the half mirrors 3, and the number of the display amplifying units 5 corresponds to that of the displays 1, so that binocular amplified display is realized. The operation principle and the function of the display amplifying unit 5 will not be described in detail herein.
EXAMPLE five
The embodiment provides an optical imaging system, which is further improved on the basis of the structure of the optical imaging system provided in the first embodiment, and specifically comprises:
as shown in fig. 8, the optical imaging system further includes:
and the display amplifying unit 5, wherein the display amplifying unit 5 is arranged at a position between the display 1 and the first 1/4 wave plate 2-1. For example, when two displays 1 are provided, one display amplification unit 5 is configured on the light emitting side of each display 1 to realize binocular amplified display, and the working principle and the function of the display amplification unit 5 are not described again here. In this embodiment, the first light splitting surface 4-1 and the second light splitting surface 4-2 are curved surfaces, and the half-transmitting and half-reflecting mirror 3 is a curved surface mirror, so as to jointly realize binocular magnifying display.
It should be noted that, in the optical imaging systems provided in the first to fifth embodiments, the first light splitting surface 4-1 and the second light splitting surface 4-2 may be provided as a plane, and the first light splitting surface 4-1 and the second light splitting surface 4-2 may also be provided as a curved surface according to a use situation.
Based on the same principle, the half mirror 3 can be a plane mirror or a curved mirror. When the surface of the half mirror 3 is a curved surface, the curved surface of the half mirror 3 can transmit part of the polarized light and has the function of focusing.
In the technical scheme, the display amplifying unit, the first light splitting surface 4-1, the second light splitting surface 4-2 and the semi-transparent semi-reflecting mirror 3 all adopt curved surfaces, so that the function of amplifying an image can be achieved while the light path is folded, optical devices are saved, the system size is favorably reduced, and the cost is reduced.
EXAMPLE six
The embodiment of the present application provides a head-mounted display device including the optical imaging system provided in the first to fifth embodiments.
The optical imaging system according to the above embodiments can be applied to a head-mounted display device, for example, a VR/AR device. The VR/AR device may be an AR helmet, VR/AR glasses, or viewing glasses. The viewing glasses may be a VR/AR device with a rectangular virtual display screen. Real world information and virtual world information are seamlessly integrated through VR/AR equipment, namely, entity information (visual information, sound, taste, touch and the like) which is difficult to experience in a certain time space range of the real world originally is overlapped after simulation through scientific technologies such as computers, virtual information is applied to the real world and is perceived by human senses, and the sensory experience beyond reality is achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An optical imaging system, comprising:
a first 1/4 wave plate for converting first type polarized light into circularly polarized light;
the semi-transparent semi-reflecting mirror is used for transmitting one part of circularly polarized light and reflecting the other part of circularly polarized light;
a second 1/4 wave plate for converting the circularly polarized light transmitted by the half mirror into a second type polarized light and converting the circularly polarized light reflected by the half mirror into a first type polarized light;
the light splitting unit is provided with an incidence surface, a first light splitting surface and a second light splitting surface, the first light splitting surface and the second light splitting surface are symmetrically arranged on two sides of a binocular central axis, and the first light splitting surface and the second light splitting surface are both configured to transmit the first type polarized light and reflect the second type polarized light;
the first type polarized light is converted into second type polarized light after passing through the first 1/4 wave plate, the half mirror and the second 1/4 wave plate in sequence, the second type polarized light enters the light splitting unit through an incident surface, and after passing through the reflection action of the first light splitting surface and the second light splitting surface in sequence, the second type polarized light is converted into circularly polarized light through the second 1/4 wave plate again, the circularly polarized light is converted into the first type polarized light after passing through the second 1/4 wave plate after being reflected by the half mirror, and the first type polarized light is finally transmitted to the observation position of human eyes through the second light splitting surface.
2. The optical imaging system of claim 1, comprising:
a display for emitting polarized light to said first 1/4 wave plate, said display being two in number and arranged to correspond to a human eye viewing position.
3. The optical imaging system of claim 2, comprising:
the display amplification units are symmetrically distributed on two sides of the binocular central axis; and when the binocular central axis is a binocular front-view screen, the normal line of the midpoint position of the connecting line of the centers of the two eyes is formed.
4. The optical imaging system of claim 2, comprising:
a display magnification unit disposed between the display and the first 1/4 waveplate.
5. The optical imaging system of claim 2, comprising:
and the display amplifying unit is arranged between the first 1/4 wave plates and between the half-mirror.
6. The optical imaging system of claim 1, wherein the first light-splitting surface and the second light-splitting surface are provided as planes.
7. The optical imaging system of claim 1, wherein the first light-splitting surface and the second light-splitting surface are provided as curved surfaces.
8. The optical imaging system of claim 1, wherein the half mirror is a flat mirror or a curved mirror.
9. The optical imaging system of any of claims 1-8, wherein the first type of polarized light is P-polarized light and the second type of polarized light is S-polarized light;
alternatively, the first and second electrodes may be,
the first type polarized light is S-type polarized light, and the second type polarized light is P-type polarized light.
10. A head-mounted display device comprising the optical imaging system of any one of claims 1-9.
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| CN202120503144.4U CN214151259U (en) | 2021-03-09 | 2021-03-09 | Optical imaging system and head-mounted display device |
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| CN202120503144.4U CN214151259U (en) | 2021-03-09 | 2021-03-09 | Optical imaging system and head-mounted display device |
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Address after: Room 1103, building C, Xingzhi science and Technology Park, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu Province 210038 Patentee after: Nanjing Qiyuan Technology Co.,Ltd. Address before: Room 1103, building C, Xingzhi science and Technology Park, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu Province 210038 Patentee before: Nanjing iqiyi Intelligent Technology Co.,Ltd. |