CN218158583U

CN218158583U - Near-eye display optical machine and near-eye display equipment

Info

Publication number: CN218158583U
Application number: CN202222400920.5U
Authority: CN
Inventors: 张倩; 陈杭
Original assignee: Zhejiang Shunwei Technology Co ltd; Sunny Optical Zhejiang Research Institute Co Ltd
Current assignee: Zhejiang Shunwei Technology Co ltd; Sunny Optical Zhejiang Research Institute Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2022-12-27
Anticipated expiration: 2032-09-09

Abstract

The utility model provides a near-to-eye shows ray apparatus and near-to-eye display device, it can be when ensureing that the display image presents all the time at people's eye field of vision center, the demand of the different glasses outward appearance of nimble adaptation, lift system's tolerance ability. The near-eye display optical machine comprises: an image source component; an imaging assembly disposed at a light emitting side of the image source assembly for modulating image light emitted via the image source assembly to image; and the deflection prism is movably arranged on the imaging side of the imaging component and is used for deflecting the image light modulated by the imaging component so as to adjust the emergent direction and the angle of the image light and couple the image light into the waveguide device.

Description

Near-eye display optical machine and near-eye display equipment

Technical Field

The utility model relates to a near-to-eye shows technical field, especially relates to a near-to-eye shows ray apparatus and near-to-eye display device.

Background

In recent years, near-eye display (NED) technologies such as Augmented Reality (AR) and Virtual Reality (VR) are becoming more and more hot. Along with the development of the LED technology and the micro display chip technology, the projection display tends to be miniaturized more and more, so that the wearable near-to-eye display system attracts attention, and the requirement on the wearing comfort level of people is higher and higher on the basis of pursuing small volume and high resolution.

However, in order to meet the market demand, the display system usually adjusts the corresponding state according to the demand of adapting the appearance of the glasses, but a series of problems are also caused to the image display. For example, as shown in fig. 1, there may be a certain angle between the projection light engine 1P and the display device 2P and between the display device 2P and human eyes, that is, the optical axis of the projection light engine 1P and the display device 2P are no longer perpendicular; or light on the optical axis of the projection light engine 1P does not vertically enter the display device 2P, but enters the display device 2P at a certain angle, and at this time, the emergent light also enters human eyes at a certain angle, which finally causes that the displayed image deviates from the center of the visual field of human eyes or is displayed along with a certain inclination (distortion), thereby seriously affecting the whole image display effect and the wearing experience.

At present, the relative position of display screen 11P and projection lens 12P is usually adjusted through the current technical scheme, realizes that the projection chief ray is emergent at an angle to guarantee that as shown in fig. 2 after transmitting through display device 2P, the chief ray can get into people's eyes perpendicularly, makes the display image of the near-to-eye display equipment of the different glasses outward appearances of adaptation present in people's eyes field of vision center all the time, does benefit to two mesh and closes like, guarantees image display effect and wears experience. But the biggest problems with this solution are: since the image is adjusted to the center of the field of view, the solution is implemented by translating the display screen, and when the projection light engine has dark edges due to assembly errors, the dark edges are usually eliminated by moving the display screen to compensate for the lighting installation errors; therefore, when the direction of movement of the display screen required to compensate for the dark edges is opposite to the direction of movement of the display screen required for image combination, this solution presents an irreconcilable conflict, resulting in no way to adapt the appearance requirements of different glasses in order to eliminate the dark edges.

SUMMERY OF THE UTILITY MODEL

An advantage of the utility model is that a near-to-eye display ray apparatus and near-to-eye display device are provided, it can be when ensureing that the display image presents all the time at people's eye field of vision center, the demand of the different glasses outward appearance of nimble adaptation, lift system's tolerance ability.

Another advantage of the present invention is to provide a near-to-eye display bare engine and near-to-eye display device, wherein, in an embodiment of the present invention, the near-to-eye display bare engine can realize the compensation of two mesh close looks and system error through the deflection prism of adjusting the front end, and need not adjust the position of the display screen like prior art.

Another advantage of the present invention is to provide a near-eye display optomechanical and near-eye display device, wherein, in an embodiment of the present invention, the near-eye display optomechanical can utilize the mode of the cemented prism, and the direction and angle of the light are coupled out in a flexible adjustment to adapt to the appearance requirements of different glasses, while effectively balancing the chromatic aberration and astigmatism of the system.

Another advantage of the utility model is in providing a near-to-eye display ray apparatus and near-to-eye display device, wherein the utility model discloses an in the embodiment, but the adjustable space of module can greatly be increased to near-to-eye display device, be convenient for realize the angular error compensation and the two mesh fusion in the assembling process, have good tolerance performance, be convenient for the volume production.

Another advantage of the present invention is to provide a near-eye display light machine and a near-eye display device, wherein to achieve the above object, the present invention does not need to adopt expensive materials or complex structures. Therefore, the utility model discloses succeed in and provide a solution effectively, not only provide a simple near-to-eye display ray apparatus and near-to-eye display device, still increased simultaneously near-to-eye display ray apparatus and near-to-eye display device's practicality and reliability.

In order to realize the utility model discloses an above-mentioned at least one advantage or other advantages and purposes, the utility model provides a near-to-eye display ray apparatus for projection image light shows in order to carry out near-to-eye to waveguide device, near-to-eye display ray apparatus includes:

an image source component;

an imaging assembly disposed at a light emitting side of the image source assembly for modulating image light emitted via the image source assembly for imaging; and

and the deflection prism is movably arranged on the imaging side of the imaging component and is used for deflecting the image light modulated by the imaging component so as to adjust the emergent direction and angle of the image light and couple the image light into the waveguide device.

According to an embodiment of the present application, the deflection prism has a first rotation axis parallel to the exit direction of the imaging component and a second rotation axis perpendicular to the first rotation axis, and the deflection prism is configured to deflect the image light exiting from the imaging component to change the exit direction of the image chief ray when the deflection prism rotates around the first rotation axis; when the deflection prism rotates around the second rotation axis, the deflection prism is used for deflecting the image light emitted from the imaging assembly to change the emission angle of the image principal ray.

According to an embodiment of the application, the first rotation axis of the deflection prism coincides with an exit optical axis of the imaging assembly.

According to one embodiment of the present application, the deflection prism includes a first angle prism and a second angle prism sequentially arranged along an exit optical axis of the imaging assembly, the first angle prism is bonded to the second angle prism, and a refractive index of the first angle prism is different from a refractive index of the second angle prism.

According to one embodiment of the present application, the image source assembly includes an illumination assembly, a relay assembly, and a display chip, the relay assembly is located in an optical path between the illumination assembly and the display chip, and the second rotational axis of the deflection prism is parallel to a display surface of the display chip.

According to an embodiment of the present application, the near-eye display light engine further includes a front stop disposed on a light exit side of the deflection prism.

According to one embodiment of the application, the image source assembly comprises an illumination assembly, a relay assembly and an LCoS chip, wherein the relay assembly is positioned in an optical path between the illumination assembly and the LCoS chip; the imaging assembly comprises a polarizing element, a polarizing beam splitter prism, an imaging lens group, a phase delay element and a concave reflector, wherein the polarizing element is positioned in the polarizing beam splitter prism and a light path between the relay assemblies, the concave reflector and the LCoS chip are positioned on two opposite sides of the polarizing beam splitter prism, the imaging lens group is positioned in the LCoS chip and the light path between the deflecting prisms, and the phase delay element is positioned in the polarizing beam splitter prism and the light path between the concave reflectors.

According to one embodiment of the application, the imaging lens group is located in an optical path between the polarization beam splitter prism and the LCoS chip, and an optical axis of the imaging lens group is coaxial with an optical axis of the concave reflecting mirror.

According to one embodiment of the application, the imaging lens group comprises a first imaging lens group located in an optical path between the polarization beam splitter prism and the LCoS chip and a second imaging lens group located in an optical path between the polarization beam splitter prism and the deflection prism.

According to one embodiment of the application, the image source assembly comprises an illumination assembly, a relay assembly and a DMD chip, wherein the relay assembly is located in an optical path between the illumination assembly and the DMD chip; the imaging component is a TIR type optical component group or an RTIR type optical component group.

According to another aspect of the present application, there is further provided a near-eye display device comprising:

the near-eye display optical machine of any one of the above; and

the waveguide device is arranged on the light projection side of the near-eye display light machine and used for transmitting the image light projected by the near-eye display light machine to human eyes for imaging.

Drawings

FIG. 1 is a schematic diagram of a prior art near-eye display eyewear;

FIG. 2 is a schematic diagram of the optical path of a prior art near-eye display eyewear before and after the display screen has been translated;

FIG. 3 is a schematic structural diagram of a near-eye display device according to one embodiment of the present application;

fig. 4 illustrates one example of a near-eye display light engine in a near-eye display device according to the above-described embodiments of the present application;

fig. 5 shows another perspective view schematic of a near-eye display light engine according to the above example of the present application;

FIG. 6 shows a schematic diagram of a near-eye display light engine according to the above-described example of the present application in a state where the deflection prism is rotated about a first axis of rotation;

FIG. 7 shows a schematic diagram of a near-eye display light engine according to the above example of the present application in a state where the deflection prism is rotated about a second axis of rotation;

fig. 8 shows a first modified example of a near-eye display light engine in the near-eye display apparatus according to the above-described embodiment of the present application;

fig. 9 shows a second variation example of the near-eye display light engine in the near-eye display apparatus according to the above-described embodiment of the present application;

fig. 10 shows a third modification example of the near-eye display light engine in the near-eye display apparatus according to the above-described embodiment of the present application.

Description of the main element symbols: 1. a near-eye display device; 10. a near-eye display light machine; 11. an image source component; 111. a lighting assembly; 1111. a monochromatic light source; 1112. a collimating mirror; 1113. a color combining device; 1114. a light uniformizing device; 112. a relay component; 1121. a reflective element; 1122. a relay lens; 113. a display chip; 1131. an LCoS chip; 1132. a DMD chip; 12. an imaging assembly; 121. a polarizing element; 122. a polarization splitting prism; 123. an imaging lens group; 1231. a first imaging lens group; 1232. a second imaging lens group; 124. a phase delay element; 125. a concave reflector; 1201. a TIR type optical element group; 1202. an RTIR type optical element group; 13. a deflection prism; 1301. a first axis of rotation; 1302. a second axis of rotation; 131. a first angle prism; 132. a second angle prism; 14. a front diaphragm; 20. a waveguide device.

The present application will be described in further detail with reference to the drawings and the detailed description.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

In the present application, the terms "a" and "an" in the claims and the description should be understood as meaning "one or more", that is, one element or a plurality of elements may be included in one embodiment or a plurality of elements may be included in another embodiment. The terms "a" and "an" and "the" and similar referents are to be construed to mean that the elements are limited to only one element or group, unless otherwise indicated in the disclosure.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like 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 should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Considering that the prior proposal not only adjusts the image to the center of the visual field by means of translating the display screen, but also eliminates the dark edge by means of compensating the lighting installation error by moving the display screen; therefore, when the moving direction of the display screen required by compensating the dark edge is opposite to the moving direction of the display screen required by combining the images, the existing scheme has irreconcilable contradiction, and the appearance requirements of different glasses cannot be adapted to eliminate the dark edge. The application creatively provides near-to-eye display glasses and a manufacturing method thereof, which can solve the problem that a glasses frame is changed into a near-to-eye display optical machine and near-to-eye display equipment due to stress of glasses legs in the using process, can flexibly adapt to the requirements of different glasses appearances while ensuring that a display image is always presented at the vision center of human eyes, and improves the tolerance capability of a system.

Specifically, referring to fig. 3 to 7 of the drawings accompanying the present application, according to one embodiment of the present application, there is provided a near-eye display apparatus 1, which may include a near-eye display light engine 10 and a waveguide device 20, where the waveguide device 20 is disposed on a light projection side of the near-eye display light engine 10, and is used for transmitting image light projected by the near-eye display light engine 10 to human eyes for near-eye display, so that a user obtains a VR/AR experience. It is to be understood that the near-eye display device 1 of the present application may be, but is not limited to, implemented as near-eye display glasses, i.e. the near-eye display device 1 has an appearance of glasses, which is convenient for a user to obtain a near-eye display experience such as VR/AR in a manner of wearing glasses.

More specifically, as shown in fig. 3, the near-eye display light engine 10 may include an image source assembly 11 for emitting image light, an imaging assembly 12, and a deflection prism 13. The imaging assembly 12 is disposed on the light emitting side of the image source assembly 11 for modulating image light emitted via the image source assembly 11 for imaging. The deflecting prism 13 is movably disposed at the imaging side of the imaging assembly 12 for deflecting the image light modulated by the imaging assembly 12 to adjust the exit direction and angle of the image light to be coupled into the waveguide device 20.

It should be noted that, since the deflecting prism 13 of the present application is adjustably located in the optical path between the imaging assembly 12 and the waveguide 20, and can deflect the image light to adjust the emitting direction and angle thereof, the near-eye display device 1 of the present application can couple the image light into the waveguide 20 in the required emitting direction and angle without adjusting an image source assembly (such as moving a display screen), so that the display image of the near-eye display device 1 is always displayed in the center of the field of view of human eyes, which not only can flexibly adapt to the requirements of different glasses appearances, but also can better implement binocular fusion, compensate for structural processing and assembly errors, and improve the tolerance capability of the system, which is of great significance for the near-eye display product to be converted to consumer products more quickly.

Exemplarily, as shown in fig. 4 and 5, the deflection prism 13 has a first rotation axis 1301 parallel to the exit direction of the imaging component 12 and a second rotation axis 1302 perpendicular to the first rotation axis 1301. As shown in fig. 6, when the deflection prism 13 rotates around the first rotation axis 1301, the deflection prism 13 is used for deflecting the image light emitted from the imaging component 12 to change the emission direction of the image chief ray, so as to flexibly adjust the placement position of the optical engine to flexibly meet the requirements of different glasses appearances; as shown in fig. 7, when the deflection prism 13 rotates around the second rotation axis 1302, the deflection prism 13 is used to deflect the image light emitted from the imaging assembly 12 to change the emission angle of the image chief ray, so as to better realize the binocular image combination. In other words, by rotating the deflection prism 13 around the first rotation axis 1301, the exit direction of the image principal ray can be arbitrarily changed in a conical surface at an angle to the first rotation axis 1301, so as to flexibly adjust the carriage position; and different from the position that changes emergent ray through translation or adjustment display screen in the existing scheme in order to realize binocular fusion, this application need not change the position of display screen, just can change emergent ray's angle through rotating this deflection prism 13 around second axis of rotation 1302 to realize binocular fusion better.

Optionally, the first rotation axis 1301 of the deflection prism 13 coincides with the exit optical axis of the imaging component 12, so as to better adjust the exit angle of the image chief ray. It is understood that the exit optical axis of the imaging component 12 of the present application may refer to the exit optical path of the chief ray in the image light modulated by the imaging component 12.

Alternatively, as shown in fig. 4, the deflecting prism 13 may include a first angle prism 131 and a second angle prism 132 sequentially arranged along the exit optical axis of the imaging component 12, the first angle prism 131 is bonded to the second angle prism 132, and the refractive index of the first angle prism 131 is different from that of the second angle prism 132, so as to better improve the system chromatic aberration and astigmatism introduced by the off-axis tilting element. It can be understood that, in the deflection prism 13 of the present application, the first angle prism 131 and the second angle prism 132 are both off-axis tilting elements, and if the refractive indexes (materials) of the two angle prisms glued together are completely the same, astigmatism will be introduced to deteriorate the near-to-eye display effect, but the present application can solve the problems of astigmatism and chromatic aberration well, and obtain a high near-to-eye display effect.

According to the above-mentioned embodiment of the present application, as shown in fig. 3, the near-eye display optical engine 10 may further include a front diaphragm 14, and the front diaphragm 14 is disposed on the light-emitting side of the deflection prism 13, so that the front diaphragm 14 is located in the optical path between the deflection prism 13 and the waveguide device 20, so as to eliminate the influence of stray light. In other words, the deflecting prism 13 is located in the optical path between the imaging component 12 and the front diaphragm 14, so that the image light modulated by the imaging component 12 is deflected by the deflecting prism 13, passes through the front diaphragm 14 and is coupled into the waveguide device 20, thereby preventing other stray light (i.e. non-image light) from being coupled into the waveguide device 20 to affect the near-eye display effect.

Alternatively, the waveguide device 20 may be, but is not limited to being, implemented as a planar optical waveguide; of course, in other examples of the present application, the waveguide device 20 may also be implemented as a curved optical waveguide, which is not described in detail herein.

Specifically, as shown in fig. 3, the image source assembly 11 of the near-eye display light engine 10 may include an illumination assembly 111, a relay assembly 112, and a display chip 113, the relay assembly 112 being located in a light path between the illumination assembly 111 and the display chip 113, such that illumination light emitted via the illumination assembly 111 is transmitted to the display chip 113 via the relay assembly 112 to be modulated into image light.

It is noted that the second rotation axis 1302 of the deflection prism 13 is preferably parallel to the display surface of the display chip 113. It can be understood that the first rotation axis 1301 of the deflection prism 13 may be parallel to the display surface of the display chip 113 or perpendicular to the display surface of the display chip 113, which is not described in detail herein.

More specifically, in one example of the present application, as shown in fig. 4 and 5, the display chip 113 is implemented as an LCoS chip 1131; correspondingly, the imaging component 12 of the near-eye display optical machine 10 may include a polarizing element 121, a polarization beam splitter 122, an imaging mirror group 123, a phase retardation element 124 and a concave mirror 125; the polarizing element 121 is located in the optical path between the polarization splitting prism 122 and the relay assembly 112, and is used for polarizing the illumination light from the illumination assembly 111 into polarized illumination light to be incident on the polarization splitting prism 122; the concave mirror 125 and the LCoS chip 1131 are located at two opposite sides of the polarization beam splitter 122, the imaging lens group 123 is located in the optical path between the LCoS chip 1131 and the deflection prism 13, and the phase retardation element 124 is located in the optical path between the polarization beam splitter 122 and the concave mirror 125.

Optionally, as shown in fig. 4, the imaging lens group 123 is located in the optical path between the polarization beam splitter 122 and the LCoS chip 1131, and the optical axis of the imaging lens group 123 is coaxial with the optical axis of the concave reflector 125, so as to ensure the coaxiality between the imaging lenses, so as to improve the problem of optical axis alignment between the lenses during the assembly process, and improve the lens tolerance performance. Thus, the polarized illumination light polarized by the polarization component 121 is reflected by the polarization beam splitter 122 to propagate to the image forming lens group 123, and then modulated by the image forming lens group 123 to be modulated into second polarized image light by the LCoS chip 1131; then, the second polarization image light modulated by the LCoS chip 1131 is modulated by the imaging lens assembly 123, passes through the polarization beam splitter 122 and the phase retardation element 124 in sequence, is reflected back to the phase retardation element 124 by the concave mirror 125, is converted into the first polarization image light by the phase retardation element 124, and is transmitted back to the polarization beam splitter 122, and finally is reflected by the polarization beam splitter 122 to exit toward the deflection prism 13.

It is noted that in this example of the present application, the first rotation axis 1301 of the deflection prism 13 may be parallel to the z-axis as shown in fig. 5; accordingly, the second rotation axis 1302 of the deflection prism 13 may be parallel to the x-axis as shown in fig. 5. It is to be appreciated that in this example of the application, the display surface of the LCoS chip 1131 is perpendicular to the y-axis as shown in fig. 4.

Alternatively, the polarization splitting prism 122 may be implemented as a PBS prism; the polarizing element 121 may be implemented as an S-polarizer for allowing S-polarized light to pass through. In other words, the illumination light from the illumination unit 111 is converted into S illumination light after passing through the polarizing element 121 to be incident on the polarization splitting prism 122. It is to be understood that the first polarized image light referred to herein has the same polarization state as the polarized illumination light and a different polarization state than the second polarized image light; for example, the first polarized image light and the polarized illumination light are implemented as S image light and S illumination light, respectively, and the second polarized image light may be implemented as P image light.

Alternatively, the phase retardation member 124 is implemented as a 1/4 wave plate for converting the polarization state of the polarized image light, so that the second polarized image light is converted into the first polarized image light after passing through the 1/4 wave plate twice.

It is noted that, for realizing color display, as shown in fig. 4 and 5, the illumination assembly 111 of the image source assembly 11 of the present application may include a plurality of monochromatic light sources 1111, a plurality of collimating mirrors 1112, a color combining device 1113, and a light unifying device 1114; the color combining device 1113 is located at the light emitting side of the plurality of monochromatic light sources 1111, the collimating lens 1112 is correspondingly disposed in the light path between the monochromatic light sources 1111 and the color combining device 1113, and the dodging device 1114 is disposed in the light path between the color combining device 1113 and the relay assembly 112. Thus, the plurality of monochromatic illumination lights emitted by the plurality of monochromatic light sources 1111 are collimated by the corresponding collimating lenses 1112, combined into one path of color-combined illumination light by the color-combining device 1113, and then homogenized by the light-homogenizing device 1114 and transmitted to the relay assembly 112.

Alternatively, the monochromatic light source 1111 may be, but is not limited to be, implemented as an LED light emitting element.

Optionally, the collimating mirror 1112 may be implemented as, but not limited to, a monolithic aspheric lens or TIR collimating mirror, facilitating compact construction of the illumination assembly 111. Meanwhile, the collimating mirror 1112 can be made of an ultraviolet yellowing resistant material, which is beneficial to prolonging the service life of the collimating mirror 1112 and facilitating the cost control.

Alternatively, the color combining device 1113 may be implemented as, but not limited to, a dichroic color combining prism or a cross dichroic color combining prism (i.e., an X-cube), or the like.

Optionally, the dodging device 1114 may be implemented as, but is not limited to, a fly-eye element or a nano-imprinted microlens array. Of course, the light unifying device 1114 may also be implemented as a binary light unifying device with angular modulation in other examples of the present application.

Alternatively, as shown in FIG. 4, the relay assembly 112 may include a reflective element 1121 and a relay lens 1122, the reflective element 1121 being located on the illumination side of the illumination assembly 111, and the relay lens 1122 being disposed on the reflective side of the reflective element 1121 so as to be located in the optical path between the reflective element 1121 and the imaging assembly 12. Thus, the illumination light emitted from the illumination assembly 111 is reflected by the reflection element 1121 to propagate to the relay lens 1122, and then propagates to the polarizer 121 of the imaging assembly 12 after being modulated by the relay lens 1122.

Alternatively, the reflective element 1121 may be implemented as, but not limited to, a 45 degree reflective prism; the relay lens 1122 may be, but is not limited to being, implemented as a single-piece aspheric lens, facilitating compression of the optical engine volume as much as possible.

It should be noted that, although in the above examples of the present application, the near-eye display optical engine 10 may employ an imaging lens based on a 0.14 inch LCoS chip, a 21 ° field angle and an entrance pupil aperture of 3mm, specifically, an imaging architecture composed of 5-piece spherical lenses may be employed, so as to have good performance in terms of both cost and tolerance and imaging performance; however, in other examples of the present application, the specific configuration of the imaging component 12 in the near-eye display optical engine 10 is not limited to the above examples, and for example, the lenses in the imaging lens group 123 may perform the required imaging function at different positions, and may also include different design configurations.

For example, in the first modified example of the present application, as shown in fig. 8, the imaging lens group 123 may include a first imaging lens group 1231 located in an optical path between the polarization splitting prism 122 and the LCoS chip 1131, and a second imaging lens group 1232 located in an optical path between the polarization splitting prism 122 and the deflection prism 13. Thus, the polarized illumination light reflected by the polarization beam splitter prism 122 is modulated by the first imaging lens assembly 1231, and then propagates to the LCoS chip 1131 to be modulated into a first polarized image light; the first polarized image light modulated by the LCoS chip 1131 is modulated by the first imaging lens assembly 1231, and then is transmitted to the polarization beam splitter prism 122; meanwhile, the second polarized image light emitted from the polarization beam splitter prism 122 is modulated by the second imaging lens assembly 1232 and then propagates to the deflection prism 13.

It is to be noted that, the near-eye display optical machine 10 of the present application can adopt a DMD chip as a display chip in addition to an LCoS chip, and only needs to configure a corresponding illumination and imaging architecture, the DMD chip can be used as the optical engine of the present application to realize the required near-eye display.

For example, compared to the above-mentioned first modified example according to the present application, as shown in fig. 9, in the second modified example of the present application, the display chip 113 in the image source assembly 11 is implemented as a DMD chip 1132, and the imaging assembly 12 is implemented as a TIR-type optical element group 1201, i.e., as an imaging lens based on the TIR architecture. Optionally, at least one imaging lens in the imaging lens group in the TIR optical element group 1201 may be located in the optical path between the DMD chip 1132 and the TIR prism, so as to reduce the overall height of the system. It is understood that other imaging lenses in the imaging lens group in the TIR optical element group 1201 may be located in the optical path between the TIR prism and the deflection prism 13, which is not described in detail herein.

Alternatively, as shown in fig. 10, in a third modified example of the present application, the imaging assembly 12 may also be implemented as an RTIR-type optical element group 1202, that is, as an imaging lens based on an RTIR architecture. Alternatively, the imaging mirror group in the RTIR type optical element group 1202 may be located in the optical path between the RTIR prism and the deflection prism 13. It is understood that the TIR architecture and the RTIR architecture are used as imaging lens architectures commonly used in the DLP projection technology, and are not described herein again.

It is worth mentioning that, before the near-eye display apparatus 1 is calibrated, the deflecting prism 13 in the near-eye display optical machine 10 is rotatably disposed in the optical path between the imaging component 12 and the waveguide device 20, so as to achieve better binocular imaging and compensate system errors by rotating the deflecting prism 13; after the near-eye display device 1 is adjusted, the deflection prism 13 in the near-eye display optical engine 10 can be fixed in the optical path between the imaging component 12 and the waveguide device 20 by, but not limited to, dispensing, so as to ensure that a good near-eye display effect is maintained for a long time.

According to another aspect of the present application, an embodiment of the present application further provides a near-eye display method, which may include the steps of:

s100: transmitting image light through an image source assembly;

s200: modulating, by an imaging component, the image light for imaging;

s300: deflecting the modulated image light through a deflection prism to adjust the emergent direction and angle of the image light; and S400: the deflected image light is transmitted to the human eye through the waveguide device to be imaged.

It is to be noted that the step S300 of the near-eye display method of the present application may include the steps of:

s310: rotating the deflection prism about a first rotation axis to change an exit direction of image chief rays in the image light, wherein the first rotation axis is parallel to the exit direction of the imaging assembly; and

s320: the deflection prism is rotated about a second rotation axis perpendicular to the first rotation axis to change an exit angle of a principal ray of the image in the image light.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A near-eye display light engine for projecting image light to a waveguide device for near-eye display, the near-eye display light engine comprising:

an image source component;

and the deflection prism is movably arranged on the imaging side of the imaging component and is used for deflecting the image light modulated by the imaging component so as to adjust the emergent direction and the angle of the image light and couple the image light into the waveguide device.

2. The near-eye display light engine of claim 1 wherein the deflection prism has a first axis of rotation parallel to the exit direction of the imaging assembly and a second axis of rotation perpendicular to the first axis of rotation, the deflection prism for deflecting image light exiting the imaging assembly to change the exit direction of image chief rays when the deflection prism is rotated about the first axis of rotation; when the deflection prism rotates around the second rotation axis, the deflection prism is used for deflecting the image light emitted from the imaging assembly to change the emission angle of the image principal ray.

3. The near-eye display light engine of claim 2 wherein the first axis of rotation of the deflection prism coincides with an exit optical axis of the imaging assembly.

4. The near-eye display light engine of claim 1 wherein the deflection prism comprises a first angle prism and a second angle prism arranged in sequence along an exit optical axis of the imaging assembly, the first angle prism is glued to the second angle prism, and a refractive index of the first angle prism is different from a refractive index of the second angle prism.

5. The near-eye display light engine of claim 2 or 3 wherein the image source assembly comprises an illumination assembly, a relay assembly, and a display chip, the relay assembly being located in the light path between the illumination assembly and the display chip, and the second axis of rotation of the deflection prism being parallel to a display surface of the display chip.

6. The near-eye display light engine of any one of claims 1 to 4, further comprising a front stop disposed on the light exit side of the deflection prism.

7. The near-eye display light engine of any one of claims 1 to 4, wherein the image source assembly comprises an illumination assembly, a relay assembly, and an LCoS chip, the relay assembly being located in a light path between the illumination assembly and the LCoS chip; the imaging assembly comprises a polarizing element, a polarizing beam splitter prism, an imaging lens group, a phase delay element and a concave reflector, wherein the polarizing element is positioned in the polarizing beam splitter prism and a light path between the relay assemblies, the concave reflector and the LCoS chip are positioned on two opposite sides of the polarizing beam splitter prism, the imaging lens group is positioned in the LCoS chip and the light path between the deflecting prisms, and the phase delay element is positioned in the polarizing beam splitter prism and the light path between the concave reflectors.

8. The near-eye display light engine of claim 7 wherein the set of imaging mirrors is positioned in the light path between the polarization splitting prism and the LCoS chip, and the optical axis of the set of imaging mirrors is coaxial with the optical axis of the concave mirror.

9. The near-eye display light engine of claim 7 wherein the set of imaging lenses comprises a first set of imaging lenses positioned in an optical path between the polarizing beam splitter prism and the LCoS chip and a second set of imaging lenses positioned in an optical path between the polarizing beam splitter prism and the deflection prism.

10. The near-eye display light engine according to any one of claims 1 to 4, wherein the image source assembly comprises an illumination assembly, a relay assembly and a DMD chip, the relay assembly being located in a light path between the illumination assembly and the DMD chip; the imaging component is a TIR type optical component group or an RTIR type optical component group.

11. A near-eye display device, comprising:

the near-eye display light engine of any one of claims 1-10; and