CN113946056A - Optical imaging display system and near-to-eye display device - Google Patents
Optical imaging display system and near-to-eye display device Download PDFInfo
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Abstract
The application provides an optical imaging display system and a near-eye display device, wherein the optical imaging display system can be applied to the near-eye display device. An optical imaging display system comprising: the image acquisition and processing module comprises an image acquisition component and a first optical component; the optical display module comprises a micro display and a first optical component; the first optical assembly includes: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer. The image acquisition processing module and the optical display module share the first optical component, so that the problem that the size and the weight of the near-to-eye display equipment are large due to the fact that the image acquisition processing module and the optical display module are arranged independently is solved; moreover, the field angles of the image acquisition processing module and the optical display module are consistent, the problem that the sizes of the virtual image and the real image of the near-to-eye display device are inconsistent when the virtual image and the real image are superposed is solved, and the image quality displayed to a user is improved.
Description
Technical Field
The application relates to the field of virtual reality display, in particular to an optical imaging display system and a near-to-eye display device.
Background
Augmented Reality (AR) and Virtual Reality (VR) technologies implement overlaying a virtual image onto a real scene by using a near-eye display scheme, provide an immersive and interactive experience for a user, and are one of research hotspots in recent years.
At present, an AR device generally includes an image capturing and processing module and an optical display module, where the two modules are separately disposed, where the image capturing and processing module mainly includes an image capturing component (for example, including a lens, a photosensor, and the like) and some optical devices, and is used to capture real-world image information. The optical display module mainly comprises a micro display and a plurality of optical devices and is used for rendering and processing the image information collected by the image acquisition assembly, superposing the rendered virtual image and the rendered real image and displaying the superposed image information to a user on the display in real time. However, the volume of the image acquisition processing module and the volume of the optical display module are both large, so that the volume and the weight of the AR device are increased. And, because image acquisition handles module and optical display module and sets up alone, use independent optical system of oneself separately, the angle of view of the respective optical system of two modules may be inconsistent, may cause the inconsistent problem of the angle of view of image acquisition processing module and optical display module, the size is inconsistent when leading to virtual image and real image stack to the image quality who causes AR equipment to show is relatively poor, reduces user experience.
Disclosure of Invention
The application provides an optical imaging display system and near-to-eye display equipment, near-to-eye display equipment include optical imaging display system, and image acquisition among this optical imaging display system handles module and optical display module sharing optical assembly, and this optical assembly includes: polarization beam splitter, the lens battery, the polaroid of optical coupling device and second type, thereby solved image acquisition and handled module and optical display module and set up alone and cause the bigger problem of near-to-eye display device volume and weight, and, because image acquisition handles module and optical display module sharing optical assembly, consequently, image acquisition handles module and optical display module angle of vision are unanimous, the problem that size is inconsistent appears when the virtual image that has solved near-to-eye display device superposes with real image, improve the quality of the image that shows for the user, improve user experience.
In a first aspect, an optical imaging display system is provided, which includes an image acquisition processing module and an optical display module, where the image acquisition processing module includes an image acquisition component and a first optical component; the optical display module comprises a micro display and a first optical component; the first optical assembly is used for processing the light reflected by the received object and transmitting the processed light to the image acquisition assembly; the first optical assembly is also used for processing the light emitted by the micro display and enabling the processed light to be incident to the eyes of the user; wherein the first optical assembly comprises: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer.
A first aspect provides an optical imaging display system comprising: image acquisition handles module and optical display module, wherein, image acquisition handles module and optical display module sharing first optical assembly, thereby solved image acquisition and handled module and optical display module and set up alone and cause the bigger problem of optical imaging display system volume, and, because image acquisition handles module and optical display module sharing optical assembly, therefore, image acquisition handles module and optical display module field angle and is unanimous, the problem that size is inconsistent appears when the virtual image that has solved optical imaging display system superposes with real image, improve the quality of the image that shows for the user, improve user experience.
Illustratively, the image acquisition component may include: a photosensor, and at least one lens or group of lenses. Wherein light from at least one lens or group of lenses is incident on the photosensor, and the photosensor can convert the incident light signal into an electrical signal.
Illustratively, the photo sensor may include a CCD type sensor, a CMOS type sensor, and the like.
In a possible implementation manner of the first aspect, the optical display module further includes: a first type of polarizer; the micro display is used for leading the generated light to enter a first type of polaroid in the optical display module; the first type of polaroid in the optical display module is used for polarizing the light from the micro display to obtain first type of polarized light, and the first type of polarized light is incident to the polarization light splitting device; the polarization beam splitter is used for transmitting the polarized light of the first type from the polaroid of the first type in the optical display module and enabling the transmitted polarized light of the first type to be incident to the lens group; the lens group is used for enabling polarized light of a first type from the polarization light splitting device to be incident into the optical coupling device; the optical coupling device is used for coupling the first type of polarized light from the lens group to the eye of a user; the polarizer of the second type in the first optical assembly is used to shield polarized light of the second type from the lens group. In this implementation, the microdisplay may emit light itself, e.g., the microdisplay may receive excitation of an electrical signal to generate an optical signal.
Illustratively, the display may comprise an OLED display.
In a possible implementation manner of the first aspect, the optical display module further includes: a light source for generating light rays including a first type of polarized light and a second type of polarized light, a second type of polarizer, and a quarter-wave plate; the second type of polarizing plate in the optical display module is used for polarizing the light from the light source to obtain second type of polarized light, and the second type of polarized light is incident to the polarization light splitting device; the polarization beam splitter is used for reflecting the polarized light of the second type from the polarizer of the second type in the optical display module and enabling the reflected polarized light of the second type to be incident into the quarter-wave plate; the quarter-wave plate is used for carrying out phase shift on the polarized light of the second type from the polarization light splitting device and enabling the light after phase shift to be incident into the micro display; the micro display is used for reflecting the light from the quarter-wave plate and enabling the reflected light to be incident to the quarter-wave plate; the quarter-wave plate is used for carrying out phase shift on light from the micro display to obtain polarized light of a first type, and the polarized light of the first type is incident into the polarization beam splitter; the polarization beam splitter is used for transmitting the first type of polarized light from the quarter-wave plate and enabling the transmitted first type of polarized light to be incident to the lens group; the lens group is used for enabling polarized light of a first type from the polarization light splitting device to be incident into the optical coupling device; the optical coupling device is used for coupling the first type of polarized light from the lens group to the eye of a user; the polarizer of the second type in the first optical assembly is used to shield polarized light of the second type from the lens group. In this implementation, the microdisplay cannot emit light by itself.
Illustratively, the display may include an LCD display, a DLP display; LCOS displays, etc.
In a possible implementation manner of the first aspect, the second type polarizer in the first optical assembly is configured to polarize light reflected by the object to obtain second type polarized light, and to inject the second type polarized light into the optical coupling device; the optical coupling device is used for coupling the polarized light of the second type to the lens group; the lens group is used for enabling the polarized light of the second type from the optical coupling device to be incident into the polarization light splitting device; the polarization beam splitter is used for reflecting the polarized light of the second type from the lens group and enabling the reflected polarized light of the second type to be incident into the image acquisition assembly.
In a possible implementation manner of the first aspect, the image acquisition processing module further includes: the second type of polaroid is arranged between the polarization beam splitting device and the image acquisition assembly and used for shielding the first type of polarized light from the polarization beam splitting device. In the implementation mode, a small amount of polarized light of the first type from the polarization light splitting device is absorbed or shielded, so that the light leakage phenomenon of the polarized light of the first type is prevented, and the contrast of an image is improved.
In a possible implementation manner of the first aspect, the image acquisition component is further configured to convert the polarized light of the second type from the polarization splitting device into an electrical signal; the micro display is also used for receiving the electric signal, generating an optical signal according to the electric signal, and enabling the optical signal to be incident into a first type of polaroid or a quarter-wave plate in the optical display module, wherein the optical signal comprises a first type of polarized light and a second type of polarized light. In this implementation, the photosensor in the image capturing assembly converts the polarized light of the second type emitted from the polarization beam splitter into an electrical signal, the microdisplay receives the electrical signal, and the microdisplay generates an optical signal by utilizing the excitation of the received electrical signal, so that an electrical signal source does not need to be separately provided for the microdisplay, and the complexity of the design and the complexity of the system structure are reduced.
In a possible implementation manner of the first aspect, the first type of polarizer is a P-type polarizer, the second type of polarizer is an S-type polarizer, the first type of polarized light is P-type polarized light, and the second type of polarized light is S-type polarized light; alternatively, the first type of polarizer is an S-type polarizer, the second type of polarizer is a P-type polarizer, the first type of polarized light is S-type polarized light, and the second type of polarized light is P-type polarized light.
In a possible implementation manner of the first aspect, the polarization splitting device includes any one of a polarization splitting prism PBS and a wire grid.
In a possible implementation form of the first aspect, the optical coupling device comprises a waveguide.
In a second aspect, a near-eye display device is provided, which includes the optical imaging display system in the first aspect or any one of the possible implementation manners of the first aspect.
The near-eye display equipment that the second aspect provided, image acquisition among the optical imaging display system handles module and optical display module sharing optical assembly to solved image acquisition and handled module and optical display module and set up alone and cause near-eye display equipment volume and the great problem of weight ratio. And because the image acquisition processing module and the optical display module share the optical assembly, the problem of inconsistent size when the virtual image of the near-to-eye display equipment is superposed with the real image is solved, the quality of the image displayed to the user is improved, and the user experience is improved.
For example, a near-eye display device may include: at least one of an AR device, an XR device, and an MR device. For example: the near-eye display device may be an HMD device, such as VR or MR glasses, a VR or MR helmet, or a VR or MR kiosk.
Drawings
FIG. 1 is a schematic diagram of an example of an image displayed by superimposing a virtual image and a real image;
FIG. 2 is a schematic structural diagram of an example of an optical imaging display system provided in an embodiment of the present application;
FIG. 3 is a schematic block diagram of another optical imaging display system provided in an embodiment of the present application;
fig. 4 is a schematic diagram illustrating optical path transmission of an image acquisition processing module in an optical imaging display system according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of optical path transmission of an image acquisition processing module in another optical imaging display system according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating optical path transmission of an optical display module in an optical imaging display system according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating optical path transmission of an optical display module in another optical imaging display system according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of an example of optical path transmission in an optical imaging display system according to an embodiment of the present disclosure;
FIG. 9 is a schematic block diagram of another optical imaging display system provided in the embodiments of the present application;
FIG. 10 is a schematic block diagram of a further exemplary optical imaging display system provided in an embodiment of the present application;
FIG. 11 is a schematic diagram illustrating optical path transmission of an optical display module in another optical imaging display system according to an embodiment of the present disclosure;
Fig. 12 is a schematic structural diagram of AR glasses provided in an embodiment of the present application.
Detailed Description
The technical solution in the present application will be described below with reference to the accompanying drawings.
In the description of the embodiments of the present application, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood 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 one or more of that feature. In the description of the present embodiment, "a plurality" means two or more unless otherwise specified.
The AR technology is to overlay a virtual image onto a real scene by using a near-eye display scheme, and provide a user with an immersive and interactive experience, and is one of research hotspots of many foreign colleges and research institutions in recent years. The AR technology has wide applications not only in application fields similar to the VR technology, such as the development and development of sophisticated weapons, aircrafts, visualization of data models, virtual training, entertainment, arts, etc., but also has important significance in the fields of industry, medicine, etc., in addition to entertainment.
The AR device may be used to implement AR technology, and the user may implement immersive visual experience using the AR device, and the commonly used AR device may include, for example, AR glasses, an AR helmet, a smartphone with AR function, and the like.
At present, an AR device generally includes an image capturing and processing module and an optical display module, where the two modules are separately disposed, where the image capturing and processing module mainly includes an image capturing component (for example, including a lens, a photosensor, and the like) and some optical devices, and is used to capture real-world image information. The optical display module mainly comprises a micro display and a plurality of optical devices and is used for rendering and processing the image information collected by the image acquisition assembly, superposing the rendered virtual image and the rendered real image and displaying the superposed image information to a user on the display in real time. However, the collection processing module and the optical display module are separately arranged to bring about the following problems:
firstly, the method comprises the following steps: because the volume of image acquisition processing module and optical display module group is all bigger, cause the volume and the weight of AR equipment to increase to some extent, reduce the user and use the experience of AR equipment.
Secondly, the method comprises the following steps: because image acquisition handles module and optical display module and sets up alone, use independent optical system of oneself separately, the angle of view of the respective optical system of two modules may be inconsistent, may cause the angle of view of image acquisition processing module and optical display module inconsistent to the size problem appears when causing the virtual image that AR equipment shows and real image stack.
For example, fig. 1 is a schematic diagram illustrating an example of an image displayed by superimposing a virtual image and a real image, and as shown in fig. 1, the middle portion (area 1) in fig. 1 is a virtual image displayed by an AR device. The region 2 including the middle portion (region 1) is a real image, and the image in the region 1 and the image in the region 2 are the same image. Because image acquisition handles module and optical display module set up alone, as shown in fig. 1, the size of reality image and virtual image is inconsistent, shows the user after overlapping reality image and virtual image, and the user probably sees the image of ghost image, causes user experience not good.
In view of the above, the present application provides an optical imaging display system that can be applied in a near-eye display device (or may also be referred to as a virtual reality display device). The optical imaging display system includes: image acquisition handles module and optical display module assembly, wherein, image acquisition handles module and optical display module assembly sharing optical assembly, and this optical assembly includes: the device comprises a polarization beam splitter, a lens group, an optical coupling device and a polaroid. Thereby solved image acquisition and handled module and optical display module and set up alone and cause nearly eye display device volume and the great problem of weight ratio, and, because image acquisition handles module and optical display module sharing optical assembly, consequently, image acquisition handles module and optical display module visual angle is unanimous, the size inconsistent problem appears when having solved nearly eye display device's (for example for AR equipment) virtual image and reality image stack, improve the quality of the image that shows for the user, improve user experience.
The near-eye display device provided by the embodiment of the application can comprise: at least one of an AR device, an extended reality (XR) device, and a Mixed Reality (MR) device.
In a specific implementation, the near-eye display device provided by the embodiment of the present application may be a Head-mounted display (HMD) device, such as VR or MR glasses, a VR or MR helmet, or a VR or MR all-in-one machine. Or a near-eye display device may also be included in the example head-mounted virtual display devices above. It is noted that in some embodiments, the near-eye display device may also be used to support the implementation of mixed reality technologies.
The optical imaging display system provided by the application is described below with reference to specific examples.
Fig. 2 is a schematic structural diagram of an example of an optical imaging display system provided in an embodiment of the present application, and as shown in fig. 2, the optical imaging display system includes an image acquisition processing module and an optical display module. Wherein, image acquisition handles the module and includes: an image acquisition assembly and a first optical assembly. The optical display module includes: a microdisplay, a first type polarizer, and a first optical assembly. The first optical assembly includes: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer. The image acquisition processing module and the optical display module share the first optical assembly. In the configuration shown in fig. 2, the microdisplay may self-illuminate. For example, a microdisplay may receive excitation of an electrical signal to produce an optical signal.
Optionally, in this embodiment of the present application, the image capturing component may include: a photosensor, and at least one lens or group of lenses. Wherein light from at least one lens or lens group (or also referred to as a camera) is incident on the photosensor, and the photosensor can convert the incident light signal into an electrical signal.
In some possible implementations of the present application, the photosensor may include: a Charge Coupled Device (CCD), a Complementary Metal Oxide Semiconductor (CMOS), and the like.
It is understood that in other embodiments of the present application, the photoelectric sensor may also be a sensor for converting an optical signal into an electrical signal, and the embodiments of the present application are not limited herein.
For example, in the embodiment of the present application, in the structure shown in fig. 2, the micro display may include an organic light-emitting diode (OLED) display, or another type of micro display that can emit light by itself, and the embodiment of the present application is not limited herein. In addition, the microdisplay can be a flexible screen or a rigid screen (i.e., a non-flexible screen). In practical application, the selection can be carried out according to the requirements of users.
Optionally, as a possible implementation manner, in this embodiment of the application, the electrical signal received by the microdisplay may be an electrical signal generated from a photosensor in the image acquisition assembly, and the microdisplay may generate an optical signal according to the excitation of the electrical signal.
Optionally, as a possible implementation manner, in this embodiment of the application, the electrical signal received by the microdisplay may also be an electrical signal generated from other components, instead of an electrical signal generated from a photosensor in the image acquisition assembly.
P-polarized light and S-polarized light will be briefly described.
When light passes through the surface of an optical element (e.g., a beam splitter) at a non-normal angle, both the reflection and transmission characteristics depend on polarization, in which case the coordinate system used is defined by a plane containing the input and reflected beams. If the polarization vector of the light is in the plane, it is called P-type polarized light; if the polarization vector is perpendicular to this plane, it is referred to as S-polarized light.
The polarization beam splitter is used for transmitting the P-type polarized light and reflecting the S-type polarized light; alternatively, light of S-type polarization is transmitted and light of P-type polarization is reflected.
In the present embodiment, the polarization splitting device may be a polarization splitting Prism (PBS) or a wire grid, and the present embodiment is not limited thereto.
It should be understood that, in the embodiment of the present application, the polarization beam splitter device may also be other forms or types of optical elements, as long as the optical elements can transmit P-type polarized light and reflect S-type polarized light; alternatively, the S-polarized light may be transmitted and the P-polarized light may be reflected.
The lens group is used for transmitting light rays.
The optical coupling device is used for changing the transmission direction of light; or to concentrate dispersed light.
In the embodiments of the present application, the optical coupling device may be a waveguide or other optical device, etc. The application is not limited herein.
In the embodiment of the present application, as a possible implementation manner, the polarizer of the first type may be a P-type polarizer, which is used for transmitting P-type polarized light and shielding (or absorbing) S-type polarized light; the polarizer of the second type is an S-type polarizer for transmitting S-polarized light and shielding (or absorbing) P-polarized light.
In the embodiment of the present application, as another possible implementation manner, the polarizer of the first type may also be an S-type polarizer, which is used for transmitting S-type polarized light and shielding (or absorbing) P-type polarized light; the second type of polarizer is a P-type polarizer for transmitting P-type polarized light and shielding (or absorbing) S-type polarized light.
In other words, in the present embodiment, the first-type polarizing plate and the second-type polarizing plate are different types of polarizing plates. For example, if the first type of polarizer is a P-type polarizer, the first type of polarized light is P-type polarized light, and if the second type of polarized light is S-type polarized light, the second type of polarized light is S-type polarized light.
Fig. 3 is a schematic structural diagram of another example of the optical imaging display system provided in the present application, and as shown in fig. 3, the optical imaging display system includes an image acquisition processing module and an optical display module. Wherein, image acquisition handles the module and includes: an image acquisition assembly, a polarizer of a second type, and a first optical assembly. The optical display module includes: a microdisplay, a first type polarizer, and a first optical assembly. The first optical assembly includes: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer. The image acquisition processing module and the optical display module share the first optical assembly. In the configuration shown in fig. 3, the microdisplay may also emit light itself.
In the example shown in fig. 3, the second type polarizer in the image capturing processing module is used to transmit the second type polarized light from the polarization beam splitter, and shield (or absorb) the first type polarized light from the polarization beam splitter, so as to prevent the light leakage phenomenon of the first type polarized light, and improve the contrast of the image captured by the image capturing component.
It should be understood that the illustrations in fig. 2 and 3 are merely examples of the structure of the optical imaging display system provided in the present application, and should not impose any limitations on the structure of the optical imaging display system of the examples in the present application. In other embodiments of the present application, the configuration of the optical imaging display system may be other configurations, for example, the position of the microdisplay and the first type of polarizer may be in other positional relationships with the image acquisition assembly and the second type of polarizer, and so on. The application is not limited herein.
The following describes the optical path transmission process of the optical imaging display system provided by the present application with reference to fig. 4 and 5.
Fig. 4 is a schematic diagram of optical path transmission of an image acquisition processing module in an optical imaging display system according to an embodiment of the present disclosure, in the example shown in fig. 4, the image acquisition processing module includes an image acquisition component, a second type polarizer, and a first optical component, in which a polarization beam splitter in the first optical component takes PBS as an example, and an optical coupling device takes a waveguide as an example. The PBS is used for reflecting S-type polarized light and transmitting P-type polarized light. The second type polarizing plate is an S-type polarizing plate. It should be understood that in other embodiments of the present application, the image acquisition processing module may not include the polarizer of the second type, or the polarizer of the second type may be a P-type polarizer.
As shown in fig. 4, the light reflected by the real object includes S-polarized light and P-polarized light, and the light reflected by the real object
After passing through the first S-type polarizer, the first S-type polarizer transmits S-type polarized light and shields (or absorbs) P-type polarized light, so that the light emitted from the first S-type polarizer is S-type polarized light. The S-polarized light from the first S-type polarizer passes through the waveguide to converge the S-polarized light, the light emitted from the waveguide enters the lens group, and the light emitted from the lens group is also the S-polarized light. The S-polarized light emitted from the lens assembly is incident on the PBS, and since the PBS reflects the S-polarized light and transmits the P-polarized light, the PBS reflects the S-polarized light from the lens assembly and reflects the S-polarized light to be incident on the second S-polarized sheet.
In some possible embodiments, the light incident on the PBS may include a small amount of P-type polarized light, since the first S-type polarizer may not completely absorb or shield P-type polarized light by a hundred percent. In addition, the PBS cannot ensure that the P-type polarized light from the lens group is completely transmitted, and part of the P-type polarized light may be reflected by the PBS, so that the second S-type polarized light arranged in front of the image capturing assembly can absorb or shield a small amount of the P-type polarized light from the PBS, thereby preventing the light leakage of the P-type polarized light and improving the contrast of the image.
The S-polarized light exiting the second S-polarized light is incident on the image capture assembly, and the photosensor in the image capture assembly can convert the optical signal into an electrical signal.
Alternatively, a photosensor in the image acquisition assembly may convert an optical signal into an electrical signal that the microdisplay may receive, causing the microdisplay to produce an optical signal upon excitation of the electrical signal.
It will be appreciated that in the example shown in fig. 4, both the first S-type polarizer and the second S-type polarizer may be replaced by P-type polarizers, in which case the PBS is then used to reflect P-polarized light and transmit S-polarized light. In addition, the P-type polarizer in the optical display module also needs to be replaced with an S-type polarizer. For example, as shown in fig. 5, fig. 5 is a schematic diagram illustrating optical path transmission of an image acquisition processing module in another optical imaging display system provided in the embodiment of the present application.
As shown in fig. 5, the light reflected by the real object includes S-polarized light and P-polarized light, and after the light reflected by the real object passes through the first P-type polarizer, the first P-type polarizer transmits the P-polarized light and shields (or absorbs) the S-polarized light, so that the light emitted by the first P-type polarizer is P-polarized light. The P-type polarized light from the first P-type polarizer passes through the waveguide to converge the P-type polarized light, the light emitted from the waveguide enters the lens group, and the light emitted from the lens group is also P-type polarized light. The P-type polarized light emitted by the lens group is transmitted to the PBS, and the PBS is used for reflecting the P-type polarized light and transmitting the S-type polarized light, so that the PBS reflects the P-type polarized light from the lens group, reflects the P-type polarized light and then emits the P-type polarized light to the second P-type polarizer.
In some possible embodiments, the light incident on the PBS may include a small amount of S-polarized light, since the first P-type polarizer may not completely absorb or shield one hundred percent of S-polarized light. In addition, the PBS cannot ensure that the S-polarized light from the lens group is completely transmitted, and part of the S-polarized light may be reflected by the PBS, so that the second P-type polarizer disposed in front of the image capturing assembly can further absorb or shield a small amount of the S-polarized light from the PBS, thereby preventing the light leakage of the S-polarized light.
The P-polarized light exiting the second P-polarized light is incident on the image capture assembly, and the photosensor in the image capture assembly can convert the optical signal into an electrical signal.
It should be understood that in the example shown in fig. 5, the second P-type polarizer may not be included in the image acquisition processing module.
Fig. 6 is a schematic diagram illustrating optical path transmission of an optical display module in an optical imaging display system according to an embodiment of the present application, in the example shown in fig. 6, a polarizing plate included in the optical display module is a P-type polarizing plate, a polarizing beam splitter in the first optical component is illustrated by taking a PBS as an example, an optical coupler is illustrated by taking a waveguide as an example, and a polarizing plate in the first optical component is illustrated by taking an S-type polarizing plate as an example. The PBS is used for reflecting S-type polarized light and transmitting P-type polarized light. In this case, if a polarizer is disposed before the image capturing element in the image capturing processing module, the polarizer is an S-type polarizer (i.e., a second type polarizer as shown in fig. 6).
In the example shown in fig. 6, the microdisplay may self-illuminate.
As shown in fig. 6, the light emitted from the microdisplay includes S-polarized light and P-polarized light, and after the light emitted from the microdisplay is incident on the P-polarizer, the P-polarizer transmits the P-polarized light and shields (or absorbs) the S-polarized light, so the light emitted from the P-polarizer is P-polarized light. The P-type polarized light emitted from the P-type polarizer is incident on the PBS, and since the PBS reflects the S-type polarized light and transmits the P-type polarized light, the P-type polarized light from the P-type polarizer is transmitted by the PBS, and the P-type polarized light transmitted by the PBS is incident on the lens group and modulated into parallel light by the lens group, which is P-type polarized light. The P-type polarized light emitted by the lens group is incident to the waveguide, and the P-type polarized light is coupled to the eyes of a user through the waveguide, so that the user can see the image obtained by superposing the virtual image and the real image.
In some possible embodiments, since the waveguide may not guarantee that all the P-polarized light from the lens group is coupled and incident into the eye of the user, a part of the P-polarized light may be transmitted through the waveguide, and as shown in fig. 6, a small amount of the P-polarized light may be transmitted from the waveguide, in this case, the first S-type polarizer in the first optical component may absorb or shield the P-polarized light transmitted from the waveguide, so as to prevent the light leakage phenomenon of the P-polarized light, and improve the contrast of the image displayed to the user.
Fig. 7 is a schematic diagram of optical path transmission of an optical display module in an optical imaging display system according to another embodiment of the present disclosure, in the example shown in fig. 7, a polarizer included in the optical display module is an S-type polarizer, a polarizing beam splitter in the first optical component is illustrated by taking a PBS as an example, and an optical coupling device is illustrated by taking a waveguide as an example, where the PBS is used for reflecting P-type polarized light and transmitting S-type polarized light. In this case, if a polarizer is disposed before the image acquisition assembly in the image acquisition processing module, the polarizer is a P-type polarizer (i.e., a second P-type polarizer as shown in fig. 7).
In the example shown in fig. 7, the microdisplay may illuminate itself.
As shown in fig. 7, the light emitted from the microdisplay includes S-polarized light and P-polarized light, and after the light emitted from the microdisplay is incident on the S-polarizer, the S-polarizer transmits the S-polarized light and shields (or absorbs) the P-polarized light, so the light emitted from the S-polarizer is S-polarized light. The S-polarized light emitted from the S-polarizer is incident on the PBS, and the PBS reflects the P-polarized light and transmits the S-polarized light, so that the S-polarized light from the S-polarizer is transmitted by the PBS, and the S-polarized light transmitted by the PBS is incident on the lens group and modulated into parallel light by the lens group, which is S-polarized light. The S-shaped polarized light emitted by the lens group is incident to the waveguide, and the S-shaped polarized light is coupled to the eyes of a user through the waveguide, so that the user can see the image obtained by superposing the virtual image and the real image.
In some possible embodiments, since the waveguide may not guarantee that the S-polarized light from the lens group is coupled and incident into the eye of the user, a part of the S-polarized light may be transmitted through the waveguide, and as shown in fig. 7, the S-polarized light may be transmitted from the waveguide, in which case, the first P-type polarizer may absorb or shield the S-polarized light transmitted from the waveguide, so as to prevent the light leakage phenomenon of the S-polarized light, and improve the contrast of the image displayed to the user.
Fig. 8 is a schematic diagram of an example of optical path transmission in an optical imaging display system, in the example shown in fig. 8, a polarizing plate included in an optical display module is a P-type polarizing plate, a polarizing beam splitter in a first optical component is illustrated by taking a PBS as an example, and an optical coupling device is illustrated by taking a waveguide as an example, where the PBS is used for reflecting S-type polarized light and transmitting P-type polarized light. The polarizer is disposed in front of the image capturing module in the image capturing processing module, and is an S-type polarizer (i.e., a second S-type polarizer as shown in fig. 8). In the example shown in fig. 8, the dotted line indicates the direction of travel of the optical path in the image capture processing module, and the solid line indicates the direction of travel of the optical path in the optical display module.
As shown in fig. 8, the light reflected by the real object includes S-polarized light and P-polarized light, and the light reflected by the real object
After passing through the first S-type polarizer, the first S-type polarizer transmits S-type polarized light and shields (or absorbs) P-type polarized light, so that the light emitted from the first S-type polarizer is S-type polarized light. The S-polarized light from the first S-type polarizer passes through the waveguide to converge the S-polarized light, the light emitted from the waveguide is transmitted to the lens group, and the light emitted from the lens group is also the S-polarized light. The S-polarized light emitted by the lens group is incident on the PBS, and the PBS reflects the S-polarized light and transmits the P-polarized light, so that the PBS reflects the S-polarized light from the lens group and reflects the S-polarized light to be incident on the second S-polarized light, and the second S-polarized light can further absorb or shield a small amount of P-polarized light from the PBS, thereby preventing the light leakage phenomenon of the P-polarized light. The S-polarized light exiting the second S-polarized light is incident on the image acquisition assembly, and the photosensor in the image acquisition assembly converts the S-polarized light exiting the second S-polarizer into an electrical signal that is received by the microdisplay. The microdisplay is actuated by the received electrical signal to produce an optical signal, and the light produced by the microdisplay includes S-polarized light and P-polarized light.
The microdisplay emits the generated S-polarized light and P-polarized light to the P-polarizer, and the P-polarizer transmits the P-polarized light and shields (or absorbs) the S-polarized light, so the light emitted from the P-polarizer is P-polarized light. The P-type polarized light emitted from the P-type polarizer is incident on the PBS, and the PBS reflects the S-type polarized light and transmits the P-type polarized light, so that the P-type polarized light from the P-type polarizer is transmitted by the PBS, and the P-type polarized light transmitted by the PBS is incident on the lens group and is modulated into parallel light by the lens group, and the parallel light is P-type polarized light. The P-type polarized light emitted by the lens group is incident to the waveguide, and the P-type polarized light is coupled to the eyes of a user through the waveguide, so that the user can see the image obtained by superposing the virtual image and the real image.
As shown in fig. 8, the first S-type polarizer in the first optical assembly may absorb or shield the P-type polarized light transmitted by the waveguide, so as to prevent the P-type polarized light from leaking light, and improve the contrast of an image displayed to a user.
Fig. 9 is a schematic structural diagram of another example of an optical imaging display system provided in an embodiment of the present application, and as shown in fig. 9, the optical imaging display system includes an image acquisition processing module and an optical display module. Wherein, image acquisition handles the module and includes: an image acquisition assembly and a first optical assembly. The optical display module includes: a light source, a polarizer of a second type, a first optical component, and a quarter-wave plate. The first optical assembly includes: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer. The image acquisition processing module and the optical display module share the first optical assembly. In the configuration shown in fig. 9, the microdisplay cannot emit light by itself, and the microdisplay needs to generate light by light from a light source.
Optionally, as another possible implementation manner, as shown in fig. 10, fig. 10 is a schematic structural diagram of another example of the optical imaging display system provided in the embodiment of the present application, and as shown in fig. 10, the optical imaging display system includes an image acquisition processing module and an optical display module. Wherein, image acquisition handles the module and includes: an image acquisition assembly, a polarizer of a second type, and a first optical assembly. The optical display module includes: a light source, a polarizer of a second type, a first optical component, and a quarter-wave plate. The first optical assembly includes: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer. The image acquisition processing module and the optical display module share the first optical assembly. In the configuration shown in fig. 10, the microdisplay cannot emit light by itself, and the microdisplay needs to generate light by light from a light source.
In the example shown in fig. 10, the second type polarizer in the image capturing processing module is used to transmit the second type polarized light from the polarization beam splitter, and shield (or absorb) the first type polarized light from the polarization beam splitter, so as to prevent the light leakage phenomenon of the first type polarized light, and improve the contrast of the image captured by the image capturing component.
It should be understood that the illustrations in fig. 9 and 10 are merely examples of the structure of the optical imaging display system provided in the embodiments of the present application, and should not limit the structure of the optical imaging display system in the examples of the present application. In other embodiments of the present application, the configuration of the optical imaging display system may also be other configurations, for example, the position of the microdisplay and the quarter-wave plate, other positional relationships with the light source and the second type polarizer, and so on. The application is not limited herein.
In the embodiment of the present application, as one possible implementation manner, in the examples shown in fig. 9 and 10, the second type polarizer may be an S-type polarizer, in which case the polarization splitting device in the first optical component is used to reflect S-type polarized light and transmit P-type polarized light.
In the embodiment of the present application, as another possible implementation manner, in the examples shown in fig. 9 and 10, the polarizer of the second type may also be a P-type polarizer, in which case the polarization splitting device in the first optical assembly is used to reflect P-type polarized light and transmit S-type polarized light.
Illustratively, in the examples described in fig. 9 and 10, the microdisplay may include: liquid Crystal Display (LCD), Digital Light Processing (DLP) displays; a Liquid Crystal On Silicon (LCOS) display, or other types or forms of micro-displays that cannot emit light by themselves, and the embodiments of the present application are not limited herein. In addition, the microdisplay can be a flexible screen or a rigid screen (i.e., a non-flexible screen).
For the structures shown in fig. 9 and 10, the process of optical path transmission of the image capturing processing module is similar to the process of optical path transmission of the image capturing processing module in fig. 4 and 5, and for corresponding description, reference may be made to the description of optical path transmission of the image capturing processing module in fig. 4 and 5, and for brevity, no further description is given here.
The following will describe the optical path transmission process of the optical display module in the structure shown in fig. 9 and 10 with reference to a specific example.
Fig. 11 is a schematic diagram illustrating optical path transmission of an optical display module in the structures shown in fig. 9 and 10 according to an example provided by the present application, and in the example shown in fig. 11, the optical coupling device is exemplified by a waveguide, the polarization splitting device in the first optical component is exemplified by a PBS, and the second type polarizer is exemplified by an S-type polarizer. The PBS is used for reflecting S-type polarized light and transmitting P-type polarized light. In this case, if a polarizing plate is disposed before the image capturing element in the image capturing processing module, the polarizing plate is an S-type polarizing plate (i.e., the third S-type polarizing plate in fig. 11). In the configuration shown in fig. 11, the microdisplay cannot emit light by itself.
As shown in fig. 11, the light emitted from the light source includes S-polarized light and P-polarized light, the light emitted from the light source is incident on a first S-polarizer, the first S-polarizer is used to transmit S-polarized light and shield (or absorb) P-polarized light, the light emitted from the first S-polarizer is S-polarized light, the S-polarized light emitted from the first S-polarizer is incident on the PBS, the PBS reflects the S-polarized light onto the quarter-wave plate, the quarter-wave plate phase-shifts the S-polarized light reflected from the PBS by a quarter, the phase-shifted light is incident on the microdisplay, the microdisplay reflects the light from the quarter-wave plate, the reflected light is incident on the quarter-wave plate, the quarter-wave plate phase-shifts the light reflected from the microdisplay by a quarter-wave plate, and after twice phase shifting of the quarter-wave plate, the light emitted by the quarter-wave plate is P-type polarized light. The P-type polarized light emitted from the quarter-wave plate is transmitted to the PBS, the PBS reflects the S-type polarized light and transmits the P-type polarized light, so that the P-type polarized light from the quarter-wave plate is transmitted by the PBS, the P-type polarized light transmitted by the PBS enters the lens group and is modulated into parallel light through the lens group, and the parallel light is the P-type polarized light. The P-type polarized light emitted by the lens group is incident to the waveguide, and the P-type polarized light is coupled to the eyes of a user through the waveguide, so that the user can see the image obtained by superposing the virtual image and the real image.
In some possible embodiments, some of the P-polarized light may be transmitted through the waveguide, since the waveguide may not guarantee full coupling of the P-polarized light from the lens group into the user's eye. As shown in fig. 11, a small amount of P-polarized light may be transmitted from the waveguide, and in this case, the second S-polarized light may absorb or shield the P-polarized light transmitted from the waveguide, so as to prevent the P-polarized light from leaking light, thereby improving the contrast of an image displayed to a user.
It is understood that in the example shown in fig. 11, the S-type polarizers can be replaced by P-type polarizers, and the PBS is used to reflect P-type polarized light and transmit S-type polarized light.
Alternatively, as another possible implementation manner, in the example shown in fig. 11, the third S-type polarizer may not be included.
The application provides an optical imaging display system, the module is handled in image acquisition among this optical imaging display system and the optical assembly of optical display module sharing, thereby it sets up alone to have solved image acquisition and has caused the great problem of near-to-eye display device volume and weight ratio with the optical display module, and, because image acquisition handles module and optical display module sharing optical assembly, therefore, image acquisition handles module and optical display module field angle unanimous, the size inconsistent problem appears when having solved near-to-eye display device's (for example for AR equipment) virtual image and the stack of reality image, improve the quality that shows the image for the user, improve user experience.
The near-eye display device provided by the present application will be described below by taking an example in which the virtual display device is AR glasses. Fig. 12 is a schematic structural diagram of AR glasses provided in an embodiment of the present application, and as shown in fig. 12, the AR glasses include: the optical imaging display system comprises an optical imaging display system and a bracket, wherein the optical imaging display system is any one of the optical imaging display systems provided by the embodiments of the application. As shown in fig. 12, the optical imaging display system includes: the camera and the micro display are arranged on the optical display module, wherein the camera belongs to an optical device included by the image acquisition assembly, and the micro display belongs to an optical device included by the optical display module. The support is used for the user to wear this AR glasses.
The application provides a near-to-eye display device, image acquisition among the optical imaging display system handles module and optical display module sharing optical assembly to solved image acquisition and handled module and optical display module and set up alone and cause near-to-eye display device volume and the bigger problem of weight. And because the image acquisition processing module and the optical display module share the optical assembly, the problem of inconsistent size when the virtual image of the near-to-eye display equipment is superposed with the real image is solved, the quality of the image displayed to the user is improved, and the user experience is improved.
It should be understood that the example shown in fig. 12 is only a schematic structural diagram of an example of the AR glasses provided in the present application, and should not impose any limitation on the structure of the AR glasses provided in the present application. For example, the structure of the AR glasses provided herein may include more structural components, and the like. The embodiments of the present application are not limited thereto.
It should be understood that the above description is only for the purpose of helping those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Various equivalent modifications or changes, or combinations of any two or more of the above, may be apparent to those skilled in the art in light of the above examples given. Such modifications, variations, or combinations are also within the scope of the embodiments of the present application.
It should also be understood that the foregoing descriptions of the embodiments of the present application focus on highlighting differences between the various embodiments, and that the same or similar elements that are not mentioned may be referred to one another and, for brevity, are not repeated herein.
It should also be understood that the manner, the case, the category, and the division of the embodiments are only for convenience of description and should not be construed as a particular limitation, and features in various manners, the category, the case, and the embodiments may be combined without contradiction.
It is also to be understood that the terminology and/or the description of the various embodiments herein is consistent and mutually inconsistent if no specific statement or logic conflicts exists, and that the technical features of the various embodiments may be combined to form new embodiments based on their inherent logical relationships.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, apparatuses and units described above may refer to the corresponding processes in the foregoing embodiments, and are not described herein again.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An optical imaging display system is characterized in that the optical imaging display system comprises an image acquisition processing module and an optical display module,
the image acquisition processing module comprises an image acquisition component and a first optical component;
The optical display module comprises a micro display and the first optical component;
the first optical assembly is used for processing the light reflected by the received object and transmitting the processed light to the image acquisition assembly;
the first optical assembly is also used for processing the light emitted by the micro display and enabling the processed light to be incident to the eyes of the user;
wherein the first optical assembly comprises: a polarization beam splitter, a lens group, an optical coupling device and a second type of polarizer.
2. The system of claim 1, wherein the optical display module further comprises: a first type of polarizer;
the micro display is used for leading the generated light to be incident to a first type of polaroid in the optical display module;
the first type of polaroid in the optical display module is used for polarizing light from the micro display to obtain first type of polarized light, and the first type of polarized light is incident to the polarization light splitting device;
the polarization beam splitter is used for transmitting the polarized light of the first type from the polaroid of the first type in the optical display module and enabling the transmitted polarized light of the first type to be incident to the lens group;
The lens group is used for enabling polarized light of a first type from the polarization light splitting device to be incident into the optical coupling device;
the optical coupling device is used for coupling the first type of polarized light from the lens group to the eye of a user;
the polarizer of the second type in the first optical assembly is used for shielding polarized light of the second type from the lens group.
3. The system of claim 1, wherein the optical display module further comprises: a light source, a polarizer of a second type, and a quarter-wave plate,
the light source is used for generating light rays, and the light rays comprise polarized light of a first type and polarized light of a second type;
the second type of polarizing plate in the optical display module is used for polarizing the light from the light source to obtain second type of polarized light, and the second type of polarized light is incident to the polarization beam splitter;
the polarization beam splitter is used for reflecting the polarized light of the second type from the polarizer of the second type in the optical display module and enabling the reflected polarized light of the second type to be incident into the quarter-wave plate;
The quarter-wave plate is used for carrying out phase shift on the polarized light of the second type from the polarization light splitting device and enabling the light after phase shift to be incident into the micro display;
the micro display is used for reflecting the light from the quarter-wave plate and enabling the reflected light to be incident to the quarter-wave plate;
the quarter-wave plate is used for carrying out phase shift on light from the micro display to obtain polarized light of a first type, and the polarized light of the first type is incident into the polarization beam splitter;
the polarization beam splitter is used for transmitting the first type of polarized light from the quarter-wave plate and enabling the transmitted first type of polarized light to be incident to the lens group;
the lens group is used for enabling polarized light of a first type from the polarization light splitting device to be incident into the optical coupling device;
the optical coupling device is used for coupling the first type of polarized light from the lens group to the eye of a user;
the polarizer of the second type in the first optical assembly is used for shielding polarized light of the second type from the lens group.
4. A system according to any of claims 1 to 3, wherein the polarizer of the second type in the first optical assembly is configured to polarize light reflected from the object, obtain polarized light of the second type, and to inject the polarized light of the second type into the optical coupling device;
the optical coupling device is used for coupling the polarized light of the second type to the lens group;
the lens group is used for enabling polarized light of the second type from the optical coupling device to be incident into the polarization light splitting device;
the polarization beam splitter is used for reflecting the polarized light of the second type from the lens group and enabling the reflected polarized light of the second type to be incident into the image acquisition assembly.
5. The system of claim 4, wherein the image acquisition processing module further comprises: a polarizer of a second type disposed between the polarization splitting device and the image acquisition assembly,
the second type of polaroid sheet arranged between the polarization beam splitting device and the image acquisition assembly is used for shielding the first type of polarized light from the polarization beam splitting device.
6. The system of claim 2 or 3, wherein the image acquisition assembly is further configured to convert the second type of polarized light from the polarization splitting device into an electrical signal;
the micro display is also used for receiving the electric signal, generating an optical signal according to the electric signal, and enabling the optical signal to be incident into a first type of polarizing plate or a quarter wave plate in the optical display module, wherein the optical signal comprises a first type of polarized light and a second type of polarized light.
7. A system according to claim 2, wherein the first type of polarizer is a P-type polarizer, the second type of polarizer is an S-type polarizer, the first type of polarized light is P-type polarized light, and the second type of polarized light is S-type polarized light; alternatively, the first and second electrodes may be,
the first type of polarizing plate is an S-type polarizing plate, the second type of polarizing plate is a P-type polarizing plate, the first type of polarized light is S-type polarized light, and the second type of polarized light is P-type polarized light.
8. The system according to any one of claims 1 to 3, wherein the polarization splitting device comprises any one of a polarization splitting Prism (PBS) and a wire grid.
9. The system of any of claims 1-3, wherein the optical coupling device comprises a waveguide.
10. A near-eye display device comprising the optical imaging display system of any one of claims 1 to 9.
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