CN213069318U

CN213069318U - Catadioptric display optical machine and near-to-eye display equipment

Info

Publication number: CN213069318U
Application number: CN202022456976.3U
Authority: CN
Inventors: 陈杭; 郝希应; 张倩; 王雁茹; 胡增新
Original assignee: Sunny Optical Zhejiang Research Institute Co Ltd
Current assignee: Sunny Optical Zhejiang Research Institute Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-04-27
Anticipated expiration: 2030-10-29

Abstract

A catadioptric display light machine and a near-to-eye display device. The catadioptric display light machine comprises an image display assembly for emitting image light, a perspective reflection assembly for partially reflecting the image light and a light splitting assembly. The light splitting assembly is correspondingly arranged in an optical path between the image display assembly and the perspective reflection assembly, and comprises a polarization light splitting element and a polarization conversion element. The lower surface of the polarization beam splitting element faces away from the image display assembly, and the upper surface of the polarization beam splitting element faces towards the perspective reflection assembly. The polarization conversion element is stacked on the upper surface of the polarization splitting element. The perspective reflection assembly is used for reflecting the light with the first polarization state reflected by the polarization beam splitting element back to the polarization beam splitting element to pass through the polarization conversion element twice, and the polarization conversion element is used for converting the light with the first polarization state passing through twice into the light with the second polarization state.

Description

Catadioptric display optical machine and near-to-eye display equipment

Technical Field

The utility model relates to an augmented reality technical field especially relates to a refraction and reflection formula shows ray apparatus and near-to-eye display device.

Background

In recent years, the appearance of micro display chip technology makes miniaturization and high-resolution projection display possible, and with the continuous development of projection display technology and field of view requirements, wearable micro projection systems are more and more emphasized, especially in the fields of today developing Augmented Reality (AR) and Near-eye display (NED).

There are many AR optical system solutions on the market today, but near-eye display devices that are truly consumer-oriented still suffer from many drawbacks, such as low brightness, small field of view, large size, high cost, and/or bulky devices. As shown in fig. 1, a conventional display light machine 10P generally includes a self-luminous display chip 11P, a half-reflecting and half-transmitting mirror 12P and a curved reflector 13P, and image light rays emitted by the self-luminous display chip 11P are reflected to human eyes through the half-reflecting and half-transmitting mirror 12P and the curved reflector 13P. Generally, the curved reflector 13P is a partial reflector, that is, a part of light is reflected and transmitted according to a certain ratio (for example, 50% of light is reflected and 50% of light is transmitted), so that the curved reflector 13P not only can reflect a part of image light back to the human eye to make the human see the corresponding image, but also can allow light of the real environment to penetrate through the curved reflector 13P to enter the human eye to make the human see the real environment, thereby achieving the purpose of augmented reality.

However, only half of the image light emitted from the self-light emitting display chip 11P is reflected by the half mirror 12P to the curved reflector 13P, and the other half of the image light escapes through the half mirror 12P; then, the curved reflector 13P can only reflect approximately half of the image light to the half-reflective half-transparent mirror 12P, and the other half of the image light escapes through the curved reflector 13P; finally, only half of the image light reflected by the curved reflector 13P can pass through the transflective mirror 12P to reach the human eye, and the other half of the image light escapes due to the reflection of the transflective mirror 12P. In other words, although the catadioptric display optical machine (the Birdbath scheme) using the self-luminous display chip as the image display source is favored because of its advantages in cost control, volume reduction and difficulty reduction, the light efficiency of the whole optical system is only about 12.5% at most, so the eye-entering brightness of the near-eye display device based on the catadioptric display optical machine is limited, and particularly in the optical system with a large field of view, the eye-entering brightness is low.

In addition, for current demonstration ray apparatus 10P, because there is the half reflection and half transmission mirror 12P who puts according to certain angle (generally be 45 contained angles with the optical axis) in this ray apparatus scheme, consequently, the ambient light that comes from this current demonstration ray apparatus 10P below will arrive this half reflection and half transmission mirror 12P as disturbing light, and then reflect 50% disturbing light to people's eye via this half reflection and half transmission mirror 12P, make the user will see the virtual image (being the artifact) of the object that is located this current demonstration ray apparatus 10P below, cause visual disturbance, this undoubtedly can reduce the effect of virtual image and user's experience.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a formula of turning over shows ray apparatus and near-to-eye display device, it can reduce the equipment degree of difficulty when improving whole optical efficiency, helps improving overall structure's compactness.

Another object of the utility model is to provide a refraction and reflection formula shows ray-machine and near-to-eye display device, it can weaken the influence of below interference light when improving whole optical efficiency, helps promoting user's comfortable experience.

Another object of the present invention is to provide a reflective display optical machine and near-to-eye display device, wherein the utility model discloses an embodiment, the reflective display optical machine need not to adopt the mode that the structure sheltered from, only adopts the ingenious design of polarization light path, just can weaken the interference light of below by a wide margin to realize the effect of eliminating the artifact.

Another object of the present invention is to provide a catadioptric display ray apparatus and near-to-eye display device, wherein the utility model discloses an embodiment, the catadioptric display ray apparatus can directly superpose the polarization conversion element in polarization beam splitting element's upper surface, and need not additionally to set up the support will polarization conversion element installs the inboard to the partial anti-component that passes through alone, and this helps reducing the whole equipment degree of difficulty of ray apparatus by a wide margin to improve the whole compactness of ray apparatus structure.

Another object of the present invention is to provide a catadioptric display bare engine and near-to-eye display device, wherein, in an embodiment of the present invention, the light splitting module of the catadioptric display bare engine can increase the function of eliminating the artifacts, and can also improve the light energy utilization of the image light.

Another object of the present invention is to provide a reflective display optical machine and a near-to-eye display device, wherein, in an embodiment of the present invention, the reflective display optical machine can reduce the leakage of the displayed image, so as to protect the privacy of the user.

Another object of the present invention is to provide a reflective display optical machine and near-to-eye display device, wherein in an embodiment of the present invention, the reflective display optical machine is provided with an antireflection film on the surface of the transparent substrate of the light splitting assembly, so as to avoid the interference of light due to the reflection of the transparent substrate to the eyes of the user.

Another object of the present invention is to provide a reflective display optical device and a near-to-eye display device, wherein in order 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 refraction and reflection formula and show ray apparatus and near-to-eye display device, still increased simultaneously the practicality and the reliability of refraction and reflection formula show ray apparatus and near-to-eye display device.

In order to realize above-mentioned at least a utility model purpose or other purposes and advantages, the utility model provides a fifty percent discount form shows ray apparatus, include:

an image display module for emitting image light;

a perspective reflection assembly for partially reflecting the image light; and

a light splitting assembly, wherein the light splitting assembly is correspondingly disposed in an optical path between the image display assembly and the see-through reflection assembly, and the light splitting assembly comprises:

the lower surface of the polarization light splitting element is away from the image display assembly, and the upper surface of the polarization light splitting element faces the perspective reflection assembly, wherein the polarization light splitting element is used for reflecting light rays with a first polarization state in the image light rays and transmitting light rays with a second polarization state in the image light rays; and

the polarization conversion element is superposed on the upper surface of the polarization beam splitting element, the perspective reflection assembly is used for reflecting the light ray with the first polarization state reflected by the polarization beam splitting element back to the polarization beam splitting element so as to pass through the polarization conversion element twice, and the polarization conversion element is used for converting the light ray with the first polarization state passing through twice into the light ray with the second polarization state.

According to an embodiment of the present application, the light splitting assembly further includes a polarization filter element, wherein the polarization filter element is stacked on the lower surface of the polarization light splitting element, and is configured to absorb light having a first polarization state from among the disturbance light and transmit light having a second polarization state from among the disturbance light.

According to an embodiment of the present application, the light splitting assembly further includes a transparent substrate, wherein the transparent substrate is stacked on the lower surface of the polarization filter element, so that the polarization filter element is located between the transparent substrate and the polarization light splitting element.

According to an embodiment of the present application, the light splitting assembly further includes an antireflection film, wherein the antireflection film is disposed on the surface of the light-transmitting substrate.

According to an embodiment of the present application, the polarization beam splitter of the beam splitter assembly is a PBS beam splitting film for reflecting S-polarized light and transmitting P-polarized light.

According to an embodiment of the present application, the polarization conversion element of the light splitting assembly is a first 1/4 wave plate.

According to an embodiment of the present application, the polarization filter element of the light splitting assembly is a first linear polarizer, and a transmission axis of the first linear polarizer is parallel to a transmission axis of the polarization light splitting element.

According to an embodiment of the present application, the image display assembly includes a micro display device for providing the image light and an imaging lens set, wherein the imaging lens set is correspondingly disposed in the optical path between the micro display device and the light splitting assembly for modulating and shaping the image light from the micro display device.

According to an embodiment of the present application, the image display assembly further includes a linearly polarizing element and a phase retardation element, wherein the linearly polarizing element and the phase retardation element are correspondingly disposed in the optical path between the microdisplay device and the light splitting assembly, and the linearly polarizing element is located between the microdisplay device and the phase retardation element, wherein the linearly polarizing element is used for converting the image light from the microdisplay device into the light having the second polarization state, and the phase retardation element is used for converting the light having the second polarization state from the linearly polarizing element into circularly polarized light, so that the circularly polarized light is converted into the light having the first polarization state when passing through the polarization conversion element of the light splitting assembly.

According to an embodiment of the present application, the linear polarizer is a second linear polarizer, wherein a transmission axis of the second linear polarizer is parallel to a transmission axis of the polarization splitting element, and the phase retardation element is a second 1/4 wave plate.

According to an embodiment of the present application, the Micro display device is one of an LCD type, an OLED type, an LCOS type, and a Micro LED type Micro display device.

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

an apparatus main body; and

at least one catadioptric display light machine, wherein the at least one catadioptric display light machine is disposed in the device main body, and every the catadioptric display light machine includes:

an image display module for emitting image light;

a perspective reflection assembly for partially reflecting the image light; and

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.

Drawings

Fig. 1 shows a schematic structural diagram of a conventional display light machine.

Fig. 2 is a schematic structural diagram of a catadioptric display optical machine according to an embodiment of the present invention.

Fig. 3 shows a partially enlarged schematic view of the light splitting assembly of the catadioptric display optical machine according to the above embodiment of the present invention.

Fig. 4 shows an exploded schematic view of the light splitting assembly according to the above embodiment of the present invention.

Fig. 5 shows a variant of the catadioptric display light machine according to the above embodiment of the present invention.

Fig. 6 illustrates an example of a near-eye display device in accordance with an embodiment of the present invention.

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 in the following description are given 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 purposes 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 herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 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.

In recent years, with the rapid development of augmented reality technology, near-eye display devices capable of realizing augmented reality are becoming more popular and used by people. However, the conventional display optical device has a very low light energy utilization ratio (usually about 12.5%) for image light, and the size of the conventional display optical device is too large, which not only causes poor image quality of the conventional display optical device, but also does not meet the development trend of miniaturization and lightness of the existing head-mounted display device.

In order to solve the above problem, referring to fig. 2 to 4, an embodiment of the present invention provides a catadioptric display optical device, which not only can greatly improve the light energy utilization rate of image light, but also helps make the catadioptric display optical device compact in structure. Specifically, as shown in fig. 2, the catadioptric display optical machine 10 includes an image display component 11 for emitting image light, a light splitting component 12 and a perspective reflection component 13 for partially reflecting the image light, and the light splitting component 12 is correspondingly disposed in the optical path between the image display component 11 and the perspective reflection component 13. It is understood that the image light in the present application refers to light carrying image information emitted via the image display assembly 11.

More specifically, as shown in fig. 2 and 3, the light splitting assembly 12 may include a polarization beam splitting element 121 and a polarization conversion element 122. The lower surface 1211 of the polarization splitting element 121 faces away from the image display assembly 11, and the upper surface 1212 of the polarization splitting element 121 faces toward the see-through reflection assembly 13, wherein the polarization splitting element 121 is configured to reflect the light having the first polarization state in the image light and transmit the light having the second polarization state in the image light. The polarization conversion element 122 is stacked on the upper surface 1212 of the polarization beam splitter 121, wherein the see-through reflection assembly 13 is configured to reflect the light with the first polarization state reflected by the polarization beam splitter 121 back to the polarization beam splitter 121 to pass through the polarization conversion element 122 twice, and the polarization conversion element 122 is configured to convert the light with the first polarization state passing through twice into the light with the second polarization state to transmit through the polarization beam splitter 121. It is understood that, in an example of the present invention, the light having the first polarization state may be, but is not limited to, polarized light having an S polarization state (S polarized light for short); accordingly, the light having the second polarization state may be, but is not limited to, implemented as polarized light having a P polarization state (P polarized light for short).

In other words, as shown in fig. 3, the light having the first polarization state in the image light emitted by the image display module 11 is reflected to the see-through reflection module 13 by the polarization beam splitter 121, passes through the polarization conversion element 122 for the first time and is converted into circularly polarized light, is partially reflected to the polarization beam splitter 121 by the see-through reflection module 13, passes through the polarization conversion element 122 for the second time and is converted into the light having the second polarization state, and then passes through the polarization beam splitter 121 to be incident into human eyes to view a virtual image corresponding to the image light. It can be understood that the ambient light from the front of the catadioptric display light machine 10 can penetrate through the perspective reflection assembly 13 to propagate to the light splitting assembly 12, so that the image light and the ambient light can simultaneously penetrate through the light splitting assembly 12 and enter the eyes of the user, so that the user can simultaneously view the image to be displayed and the real environment, and the purpose of augmented reality is achieved.

It should be noted that, because the polarization conversion element 122 in the catadioptric display optical machine 10 of the present application is overlapped on the upper surface 1212 of the polarization beam splitter 121, unlike the existing display optical machine in which a polarization conversion element is disposed inside the see-through reflection assembly 13 having a curved surface, the polarization conversion element 122 in the catadioptric display optical machine 10 of the present application is more easily and precisely assembled, and there is no need to additionally provide a mounting bracket for the polarization conversion element 122, and the problem of structural interference between the polarization conversion element 122 and the polarization beam splitter 121 can be eliminated, so that the catadioptric display optical machine 10 is simple in structural assembly, and a display optical machine with a compact structure, a small volume and a light weight is obtained.

In addition, the perspective reflection assembly 13 of the catadioptric display optical machine 10 of the present application is usually a partial reflector (e.g., reflects 50% of light and transmits 50% of light), so that the image light is only half lost at the polarization beam splitting element 121 and the perspective reflection unit 13, respectively, i.e., the optical energy utilization rate of the catadioptric display optical machine 10 for the image light is greater than 20%, which is nearly twice higher than that of the above-mentioned conventional display optical machine 10P for the image light.

It should be noted that, according to the above-mentioned embodiment of the present application, as shown in fig. 2 and fig. 4, the light splitting assembly 12 of the catadioptric display light engine 10 may further include a polarization filter element 123, wherein the polarization filter element 123 is stacked on the lower surface 1211 of the polarization light splitting element 121, and the polarization filter element 123 is configured to absorb light having a first polarization state from among the disturbance light and transmit light having a second polarization state from among the disturbance light. In this way, the ambient light (i.e. the interference light) from below the catadioptric display light machine 10 will pass through the polarized light filter element 123 for filtering and then be transmitted to the polarization beam splitter 121, so that the light with the first polarization state in the interference light will be absorbed by the polarized light filter element 123 and will not be reflected by the polarization beam splitter 121 to the eyes of the user; meanwhile, although the light with the second polarization state in the disturbing light can pass through the polarized light filter element 122 to be transmitted to the polarization beam splitter element 121, the light can pass through the polarization beam splitter element 121 without being reflected by the polarization beam splitter element 121 to the eyes of the user, so as to eliminate the artifact disturbance caused by the disturbing light from the lower side of the catadioptric display light machine 10, thereby enabling the catadioptric display light machine 10 to have an artifact elimination function and improving the use experience of the user.

It will be appreciated that the image light and the disturbing light are typically both unpolarized light, i.e. the image light and the disturbing light comprise both P-polarized light and S-polarized light. It should be noted that, in order to distinguish the image light from the interference light in the figure, P-polarized light in the interference light is denoted as P-polarized light, and S-polarized light in the interference light is denoted as S-polarized light.

Illustratively, in an example of the present invention, as shown in fig. 2 and 3, the polarization splitting element 121 of the splitting assembly 12 may be, but is not limited to, implemented as a PBS splitting film 1210, wherein the PBS splitting film 1210 is stacked between the polarization conversion element 122 and the polarization filter element 123, and is used for reflecting light having a first polarization state and allowing light having a second polarization state to pass through. It is understood that the PBS splitting film 1210 may be attached or plated on the lower surface of the polarization conversion element 122 or the upper surface of the polarization filter element 123, but is not limited thereto, as long as the PBS splitting film 1210 is located between the polarization conversion element 122 and the polarization filter element 123.

In an example of the present invention, as shown in fig. 2 to 4, the polarization conversion element 122 may be, but is not limited to, implemented as a first 1/4 wave plate 1220 for converting the light having the first or second polarization state passing through the first 1/4 wave plate 1220 twice into the light having the second or first polarization state. In other words, as shown in fig. 3, the first 1/4 wave plate 1220 is stacked on the upper surface 1212 of the polarization beam splitter 121, so that the light having the first polarization state reflected by the polarization beam splitter 121 in the image light firstly passes through the first 1/4 wave plate 1220 for the first time to be converted into the first circularly polarized light, and after being reflected by the see-through reflective component 13 to be converted into the second circularly polarized light, the light having the second polarization state passes through the first 1/4 wave plate 1220 for the second time to be converted into the light having the second polarization state, so that the light having the first polarization state is converted into the light having the second polarization state after passing through the first 1/4 wave plate 1220 twice, and most of the reflected image light can pass through the polarization beam splitter 121. In particular, the light having the second polarization state transmitted through the polarization beam splitter 121 can also transmit through the polarization filter 123 to be incident on the eyes of the user, and the energy of the light having the second polarization state is not lost due to the polarization filter 123, which is helpful to ensure that the catadioptric display light engine 10 has a high light energy utilization rate for the image light.

In an example of the present invention, as shown in fig. 2 and 4, the polarization filter element 123 of the light splitting assembly 12 may be, but is not limited to, implemented as a first linear polarizer 1230 for allowing only light having the second polarization state to pass through and absorbing light having the first polarization state. Illustratively, as shown in fig. 2 and 3, the first linear polarizer 1230 of the polarization filter element 123 may be implemented as a P-polarizer for allowing only P-polarized light to pass therethrough and absorbing S-polarized light so as to match the PBS splitting film 1210 (e.g., PBS film, reflecting S-polarized light, and transmitting P-polarized light) of the polarization splitting element 121.

It is noted that, as shown in fig. 4, the transmission axis of the first linear polarizer 1230 of the present application is parallel to the transmission axis of the polarization splitting element 121, that is, the first linear polarizer 1230 has the same transmission axis direction as the polarization splitting element 121.

According to the above embodiment of the present application, as shown in fig. 3 and 4, the light splitting assembly 12 may further include a transparent substrate 124, wherein the transparent substrate 124 is stacked on the lower surface of the polarization filter element 123, so that the polarization filter element 123 is located between the transparent substrate 124 and the polarization light splitting element 121, so as to protect and support the polarization filter element 123 through the transparent substrate 124. It is understood that the light-transmissive substrate 124 may be made of, but not limited to, a light-transmissive material such as glass, light-transmissive plastic, etc., to allow light to be transmitted through the light-transmissive substrate 124.

Preferably, as shown in fig. 3 and fig. 4, the light splitting assembly 12 may further include an antireflection film 125, where the antireflection film 125 is disposed on the surface of the transparent substrate 124, and is used to reduce reflection of the interference light at the surface of the transparent substrate 124, which helps to avoid causing visual interference. It is understood that the antireflection film 125 may be, but is not limited to, plated on the surface of the light-transmitting substrate 124. For example, in other examples of the present invention, the antireflection film 125 may also be directly attached to the surface of the light-transmitting substrate 124.

It should be noted that, in an example of the present invention, as shown in fig. 2, the see-through reflection assembly 13 may include, but is not limited to, a curved substrate 131 and a partial reflection film 132, wherein the partial reflection film 132 is supportedly disposed on a surface of the curved substrate 131 for reflecting at least a portion of the light having the first polarization state reflected by the polarization splitting element 121 back to the polarization splitting element 121, so that the light having the first polarization state passes through the polarization conversion element 122 twice to be converted into the light having the second polarization state, and then passes through the polarization splitting element 121 to be incident into the user's eye. It is understood that the partially reflective film 132 may be, but not limited to, attached or plated on the inner surface of the curved substrate 131, and may also be disposed on the outer surface of the curved substrate 131. In addition, the curved substrate 131 may be made of a light transmissive material such as optical plastic or optical glass, etc. to ensure that ambient light can pass through the see-through reflective component 13.

It is noted that the surface type of the curved substrate 131 of the see-through reflective assembly 13 of the present application can be, but is not limited to, implemented as a standard spherical surface, an aspherical surface or a free-form surface, so that the partially reflective film 132 has the same surface type.

Preferably, in the above embodiment of the present invention, the partially reflective film 132 may be implemented as a semi-reflective semi-permeable film for reflecting half of the light having the first polarization state reflected by the polarization splitting element 121 back to the polarization splitting element 121. Of course, in other examples of the present invention, the partial reflective film 132 may also be implemented as a reflective film system having a predetermined reflective spectrum, wherein the predetermined reflective spectrum of the reflective film system is consistent with the spectrum of the image light emitted from the image display module 11, so as to reflect all the light reflected by the polarization beam splitter 121 back to the polarization beam splitter 121, and simultaneously allow the portion of the ambient light with inconsistent spectrum to pass through the reflective film system, so as to be incident to the eyes of the user, thereby ensuring that the catadioptric display light machine 10 can also prevent the image from leaking out, improve the light energy utilization rate of the system, improve the image contrast, and have an excellent augmented reality effect on the basis of eliminating the underlying reflection artifact.

According to the above embodiment of the present invention, as shown in fig. 2, the image display assembly 11 of the catadioptric display optical machine 10 may include a micro display device 111 and an imaging lens assembly 112, wherein the micro display device 111 is used for providing image light, and the imaging lens assembly 112 is correspondingly disposed in the optical path between the micro display device 111 and the light splitting assembly 12 for modulating and shaping the image light from the micro display device 111.

Preferably, in the catadioptric display optical machine 10 according to the above embodiment of the present invention, an included angle between the polarization beam splitter 121 of the beam splitter 12 and an optical viewing axis (e.g., a horizontal direction in fig. 2) of the catadioptric display optical machine 10 is between 40 ° and 70 °. It is understood that the optical viewing axis of the catadioptric display light engine 10 can be implemented as a main viewing axis defined by the light splitting assembly 12 and the transflective assembly 13 together, so that a user can see both a virtual image displayed via the image display assembly 11 and a real image of an external environment along the optical viewing axis to obtain a virtual-real fused augmented reality experience.

It is noted that, in an example of the present invention, the imaging lens set 112 of the catadioptric display optical machine 10 may include, but is not limited to, at least one lens, wherein the surface type of the at least one lens may be, but is not limited to, implemented as, for example, a standard spherical surface, an aspherical surface, a free-form surface, or a diffractive surface, for modulating and shaping the image light from the micro display device 111. It is understood that the free-form surfaces mentioned in the present invention may be, but are not limited to, surface types implemented as XY polynomial free-form surfaces, Zernike polynomial free-form surfaces, or toric surfaces, etc.

Furthermore, in an example of the present invention, the Micro display device 111 may be, but is not limited to be, implemented as one of LCD, OLED, LCOS and Micro LED type Micro display devices for providing the image light. In particular, when the microdisplay device 111 is implemented as an LCOS type microdisplay device, the LCOS type microdisplay device can emit image light with a first polarization state to match with the polarization beam splitter element 121, so that the image light emitted by the image display device 11 is not lost at the polarization beam splitter element 121, which helps to further improve the light energy utilization rate of the catadioptric display light engine 10 for the image light.

Fig. 5 shows a variant of the catadioptric display light machine 10 according to the above-described embodiment of the invention. Compared with the above embodiments according to the present invention, the reflective display optical device 10 according to this variant embodiment of the present invention is different in that: as shown in fig. 5, the image display module 11 may further include a linear polarizer 113 and a phase retarder 114, wherein the linear polarizer 113 and the phase retarder 114 are disposed in the optical path between the micro display device 111 and the light splitting module 12, respectively, and the linear polarizer 113 is disposed between the micro display device 111 and the phase retarder 114, wherein the linear polarizer 113 is used for converting the image light from the micro display device 111 into light having the second polarization state, and the phase retarder 114 is used for converting the light having the second polarization state from the linear polarizer 113 into circularly polarized light, so that the circularly polarized light is converted into the light having the first polarization state when passing through the polarization conversion element 122 of the light splitting module 12, and then reflected by the polarization beam splitter 121 of the light splitting module 12, so as to realize the augmented reality experience of the reflex display light machine 10.

Illustratively, in an example of the present application, as shown in fig. 5, the linear polarization element 113 and the phase delay element 114 are both located between the microdisplay device 111 and the imaging lens group 112, so that the image light from the microdisplay device 111 passes through the linear polarization element 113 and the phase delay element 114 in sequence to be converted into circularly polarized light, and then is modulated by the imaging lens group 112 to propagate to the light splitting assembly 12. Of course, in other examples of the present application, the linear polarization element 113 and the phase delay element 114 may also be respectively located at two sides of the imaging lens group 112, or located between the imaging lens group 112 and the light splitting component 12, as long as it is ensured that the image light from the micro display device 111 is converted into the circularly polarized light before propagating to the light splitting component 12.

Preferably, as shown in fig. 5, the linear polarization element 113 of the image display assembly 11 may be implemented as a second linear polarizer 1130 for allowing only the light having the second polarization state to pass therethrough and absorbing the light having the first polarization state. Exemplarily, as shown in fig. 5, the second linear polarizer 1130 of the linear polarizer 113 may be implemented as a P-polarizer for allowing only P-polarized light to pass through and absorbing S-polarized light so as to match with the PBS splitting film 1210 of the polarization beam splitter 121 (reflecting S-polarized light and transmitting P-polarized light), so that the image light from the micro display device 111 is converted into the polarized light with the first polarization state after passing through the linear polarizer 113, the phase retarder 114 and the polarization conversion element 122 in sequence, and then reflected by the polarization beam splitter 121, so as to realize an augmented reality experience of the transflective display light engine 10.

It is noted that the transmission axis of the second linear polarizer of the present application is parallel to the transmission axis of the polarization beam splitter 121, that is, the polarization beam splitter 121 and the second linear polarizer 1130 have the same transmission axis direction, and the transmission axes of the first linear polarizer 1230 and the second linear polarizer 1130 are parallel to the transmission axis of the polarization beam splitter 121.

In an example of the present application, as shown in fig. 5, the phase retardation element 114 of the image display assembly 11 can be, but is not limited to, implemented as a second 1/4 wave plate 1140, wherein the second 1/4 wave plate 1140 is used for converting the light having the second polarization state into the circularly polarized light. Preferably, the second 1/4 wave plate 1140 and the first 1/4 wave plate 1220 are implemented as 1/4 wave plates of 45 °, so that the light ray with the second polarization state transmitted by the linear polarization element 113 in the image light ray passes through the second 1/4 wave plate 1140 to be converted into the first circularly polarized light, and then passes through the first 1/4 wave plate 1220 to be converted into the light ray with the first polarization state, so that the light ray with the second polarization state is converted into the light ray with the first polarization state after passing through the second and first 1/4

wave plates

1140 and 1220 in sequence, to be reflected by the polarization beam splitter 121, thereby realizing the augmented reality experience of the transflective display light engine 10.

According to the utility model discloses an on the other hand, as shown in fig. 6, the utility model discloses further provide dispose the near-to-eye display device 1 that the formula of turning over shows ray apparatus 10 to when improving whole optical efficiency, reduce the equipment degree of difficulty, help improving overall structure's compactness. For example, as shown in fig. 6, the near-eye display device 1 may include at least a catadioptric display light engine 10 and a device body 20, wherein the catadioptric display light engine 10 is disposed on the device body 20, so that a user can wear the near-eye display device 1 to obtain a comfortable augmented reality experience.

It is noted that the device body 20 may be implemented as, but not limited to, a glasses body, so that the near-eye display device 1 is implemented as AR glasses with artifact interference elimination function, which helps to improve the user experience. It is understood that in other examples of the present invention, the near-eye display device 1 may also be implemented as other types of AR devices, such as AR helmets and the like.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. A catadioptric display light engine, comprising:

an image display module for emitting image light;

a perspective reflection assembly for partially reflecting the image light; and

2. The catadioptric display light engine of claim 1, wherein the light splitting assembly further comprises a polarizing filter, wherein the polarizing filter is stacked on the lower surface of the polarizing light splitting element, and is configured to absorb light of a first polarization state of the disturbing light and transmit light of a second polarization state of the disturbing light.

3. The catadioptric display light engine of claim 2, wherein the light splitting assembly further comprises a transparent substrate, wherein the transparent substrate is stacked on a lower surface of the polarization filter element such that the polarization filter element is located between the transparent substrate and the polarization splitting element.

4. The catadioptric display light engine of claim 3, wherein the light splitting assembly further comprises an anti-reflection film disposed on the surface of the light-transmissive substrate.

5. The catadioptric display light engine of any one of claims 1 to 4, wherein the polarization beam splitter of the beam splitter is a PBS beam splitter film for reflecting S-polarized light and transmitting P-polarized light.

6. The catadioptric display light engine of claim 5, wherein the polarization conversion element of the light splitting assembly is a first 1/4 wave plate.

7. The catadioptric display light engine of any one of claims 2 to 4, wherein the polarization filter element of the light splitting assembly is a first linear polarizer, and a transmission axis of the first linear polarizer is parallel to a transmission axis of the polarization beam splitter.

8. The retro-reflective display optic of any one of claims 1 to 4, wherein the image display assembly comprises a micro-display device for providing the image light and an imaging lens assembly, wherein the imaging lens assembly is correspondingly disposed in an optical path between the micro-display device and the light splitting assembly for modulating and shaping the image light from the micro-display device.

9. The catadioptric display light engine of claim 8, wherein the image display assembly further comprises a linear polarizer and a phase retarder, wherein the linear polarizer and the phase retarder are disposed in the optical path between the microdisplay device and the light splitting assembly, respectively, and the linear polarizer is disposed between the microdisplay device and the phase retarder, wherein the linear polarizer converts the image light from the microdisplay device into the light having the second polarization state, and the phase retarder converts the light having the second polarization state from the linear polarizer into circularly polarized light, such that the circularly polarized light is converted into the light having the first polarization state when passing through the polarization conversion element of the light splitting assembly.

10. The catadioptric display light engine of claim 9, wherein the linear polarizer is a second linear polarizer, wherein a transmission axis of the second linear polarizer is parallel to a transmission axis of the polarization beam splitter, and the phase retarder is a second 1/4 wave plate.

11. The retro-reflective display light engine of claim 8, wherein the Micro-display device is one of an LCD type, an OLED type, an LCOS type, and a Micro LED type Micro-display device.

12. A near-eye display device, comprising:

an apparatus main body; and

an image display module for emitting image light;

a perspective reflection assembly for partially reflecting the image light; and