CN108333776B

CN108333776B - Near-eye display optical module and near-eye display system

Info

Publication number: CN108333776B
Application number: CN201810357124.3A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Shenzhen Skyworth New World Technology Co ltd
Current assignee: Shenzhen Skyworth New World Technology Co ltd
Priority date: 2018-04-20
Filing date: 2018-04-20
Publication date: 2023-10-03
Anticipated expiration: 2038-04-20
Also published as: CN108333776A

Abstract

The invention provides a near-eye display optical module and a near-eye display system. The near-eye display system comprises a near-eye display optical module and an image display device. The near-eye display optical module comprises an electric control liquid crystal polarizing element, a first reflection amplifying element, a second reflection amplifying element, a phase delay plate and a reflecting element. The image display device sequentially outputs a first beam of sub-image light and a second beam of sub-image light of an image to be displayed, and the first sub-image to be displayed and the second sub-image to be displayed which are formed by reflecting and converging the first sub-image light and the second sub-image light by the first reflecting and amplifying element and the second reflecting and amplifying element can be spliced into the image to be displayed visually by a user. The near-eye display optical module and the near-eye display system have the characteristics of large field of view and high resolution, and have smaller volume compared with the near-eye display optical module and the near-eye display system with the traditional display optical module.

Description

Near-eye display optical module and near-eye display system

Technical Field

The invention relates to the technical field of augmented reality, in particular to a near-eye display optical module and a near-eye display system.

Background

Augmented reality (AR, augmented Reality) is a technology for performing reality augmentation on a real scene by using virtual objects or information, and is widely used in various fields such as scientific research, military, industry, games, video, education, and the like. Currently, a mainstream near-eye display system applied to augmented reality generally adopts a miniature image display as an image source, and is matched with a traditional display optical module (a half-reflection half-transmission plane mirror and a traditional visual optical system) to realize enhanced display. Limited to the state of the art and technology, the resolution of miniature image displays is difficult to increase. Moreover, the display field of view of the conventional display optical module is closely related to the volume of the display optical module. The display field is increased, and the volume of the conventional display optical module is increased dramatically. Therefore, the currently mainstream near-eye display system applied to augmented reality has problems of low resolution, and small or large field of view.

Disclosure of Invention

Accordingly, the present invention is directed to a compact near-eye display optical module with large field of view and high resolution and a near-eye display system, which solve the above-mentioned problems.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the preferred embodiment of the invention provides a near-eye display optical module, which comprises an electric control liquid crystal polarizing element, a first reflection amplifying element, a second reflection amplifying element, a phase delay plate and a reflecting element;

the image display device sequentially outputs a first beam of sub-image light and a second beam of sub-image light of an image to be displayed, wherein the first beam of sub-image light and the second beam of sub-image light are collimated parallel light beams with a first linear polarization direction, each image to be displayed comprises a first sub-image to be displayed and a second sub-image to be displayed, the first beam of sub-image light corresponds to the first sub-image to be displayed, and the second beam of sub-image light corresponds to the second sub-image to be displayed;

the electronic control liquid crystal polarization element is arranged on an emergent light path of the image display device and is used for changing the polarization direction of the incident first beam of sub-image light or the second beam of sub-image light into a second linear polarization direction after the control voltage is applied, and the second linear polarization direction is orthogonal to the first linear polarization direction;

The first reflection amplifying element and the second reflection amplifying element are sequentially arranged on an emergent light path of the electric control liquid crystal polarizing element and are polarization sensitive reflection converging elements, and the first reflection amplifying element and the second reflection amplifying element are respectively used for enabling a first beam of sub-image light to form the first sub-image to be displayed on a human eye and enabling a second beam of sub-image light to form the second sub-image to be displayed on the human eye;

the phase delay sheet is arranged between the second reflection amplifying element and the reflection element and is used for converting the polarization direction of the second beam of sub-image light into an elliptical polarization direction or a circular polarization direction and converting the polarization direction of the second beam of sub-image light reflected from the reflection element into a non-first linear polarization direction or a non-second linear polarization direction;

after the image display device outputs a first beam of sub-image light and a second beam of sub-image light of an image to be displayed, the first sub-image to be displayed and the second sub-image to be displayed formed by human eyes can be spliced into the image to be displayed visually by a user;

the real world ambient light enters the human eye through the near-eye display optical module to form an ambient image.

Optionally, the near-eye display optical module further includes a first optical device disposed between the phase retarder and the reflective element, a refractive transmission focal plane of the first optical device being coplanar with a reflection plane of the reflective element.

Optionally, the near-eye display optical module further includes an electrically controlled optical device disposed between the electrically controlled liquid crystal polarizing element and the first reflective amplifying element for converging the parallel light beam when the control voltage is applied, and a reflective working surface of the reflective element is disposed to have a function of converging the parallel light beam.

Optionally, the near-eye display optical module further includes a second optical device with a converging function, which is disposed between the electronically controlled liquid crystal polarizing element and the first reflective amplifying element, and the first reflective amplifying element has a function of reflecting and converging an incident converging light beam, and the reflective working surface of the reflective element has a function of converging a parallel light beam.

Alternatively, the reflective working surface of the reflective element has a function of converging parallel light beams, and the second reflective amplifying element has an imaging property of an ellipsoidal curved surface.

Optionally, the near-eye display optical module further includes a polarization conversion element disposed between the first reflective amplifying element and the second reflective amplifying element, and the second reflective amplifying element and the first reflective amplifying element are different in polarization sensitivity.

Optionally, the near-eye display optical module further includes an absorption-type polarizing element disposed in a reflection convergence direction of the first reflection amplifying element and the second reflection amplifying element.

Optionally, the near-eye display optical module further comprises a beam expanding system or a beam shrinking system.

Optionally, the medium with refractive index is filled between the elements of the near-eye display optical module.

The present invention also provides a near-eye display system, which includes an image display device and the near-eye display optical module.

According to the near-eye display optical module and the near-eye display system, through ingenious integration and design of the electric control liquid crystal polarizing element, the first reflection amplifying element, the second reflection amplifying element, the phase delay plate and the reflecting element, a first sub-image to be displayed is formed on human eyes and a second sub-image to be displayed is formed on human eyes through the first reflection amplifying element, and the first sub-image to be displayed and the second sub-image to be displayed formed on human eyes are spliced into the image to be displayed in a user vision mode through a vision residual effect. Therefore, the angle of view of the near-eye display optical module and the near-eye display system is equal to the sum of the angles of view of the first reflective amplifying element and the second reflective amplifying element. And, the resolutions of the first sub-image to be displayed and the second sub-image to be displayed may be the same and equal to the resolution of the image to be displayed. Therefore, the near-eye display optical module and the near-eye display system have high resolution while displaying large-field images, and have smaller volume compared with the near-eye display optical module with the traditional display optical module applied to augmented reality. Meanwhile, the near-eye display optical module and the imaging method of the near-eye display system based on the reflection imaging principle enable images after reflection and convergence to have no chromatic aberration, and the center and the edge of the amplified images have consistent definition based on the amplified imaging of beamlets.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described. It is to be understood that the following drawings illustrate only certain embodiments of the invention and are therefore not to be considered limiting of its scope, for the person of ordinary skill in the art may admit to other equally relevant drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a near-eye display system according to an embodiment of the present invention.

Fig. 2 is a schematic view of an optical path of the near-eye display system shown in fig. 1 for displaying an image to be displayed.

Fig. 3 is a schematic view of another optical path of the near-eye display system shown in fig. 1 for displaying an image to be displayed.

Fig. 4 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 5 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 6 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 7 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 8 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 9 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 10 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 11 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 12 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 13 is a schematic structural diagram of a near-eye display system according to another embodiment.

Fig. 14 is a comparison of the field angle of a near-eye display system without a beam expanding system.

Fig. 15 is a schematic structural diagram of a near-eye display system according to another embodiment.

Icon, 10-near eye display optical module; 1-a near-eye display system; 50-an image display device; 11-an electronically controlled liquid crystal polarizing element; 12-a first reflective amplifying element; 13-a second reflective amplifying element; 14-phase delay plates; 15-a reflective element; v1-a first entity; v2-a second entity; v3-a third entity; v4-fourth entity; 16-a first optical device; 17-electronically controlled optics; v5-a fifth entity; v6-sixth entity; v7-seventh entity; v8-eighth entity; 18-a second optical device; a 19-polarization conversion element; a 21-absorptive polarizing element; 22-a beam expanding system; 23-beam condensing system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present invention, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish between descriptions and are not to be construed as merely or implying relative importance.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a near-eye display system 1 according to an embodiment of the invention. The near-eye display system 1 can be applied to an augmented reality device such as an HMD (Head Mount Display, head-mounted type visual device) or smart glasses, and is not limited thereto. The near-eye display system 1 includes a near-eye display optical module 10 and an image display device 50. The near-eye display optical module 10 comprises an electrically controlled liquid crystal polarizing element 11, a first reflective amplifying element 12, a second reflective amplifying element 13, a phase retarder 14 and a reflecting element 15.

In the case of performing enhanced display, the near-eye display optical module 10 needs to be matched with the image display device 50 to construct the near-eye display system 1. The image display device 50 is configured to sequentially output a first sub-image light beam and a second sub-image light beam of an image to be displayed, where the first sub-image light beam and the second sub-image light beam are collimated parallel light beams having a first linear polarization direction. The image to be displayed is a virtual image displayed by the near-eye display system 1, i.e. a virtual display of artificial additional information to the real world environment. Each image to be displayed comprises a first sub-image to be displayed and a second sub-image to be displayed. In order to improve the display effect, the resolutions of the first sub-image to be displayed and the second sub-image to be displayed may be the same. And the first sub-image to be displayed and the second sub-image to be displayed may be the same or different in size. The first beam of sub-image light corresponds to a first sub-image to be displayed, that is, the image display device 50 outputs the first beam of sub-image light according to the first sub-image to be displayed. The second beam of sub-image light corresponds to a second sub-image to be displayed, that is, the image display device 50 outputs the second beam of sub-image light according to the second sub-image to be displayed. In practical implementation, the image display device 50 may be composed of a transmissive or reflective LOCS display source and an illumination light source assembly capable of outputting collimated parallel light illumination, or may be composed of a fiber scanning imaging system and a collimation system. In this embodiment, the image display device 50 is composed of a transmissive LOCS display source and an illumination light source assembly capable of outputting collimated parallel light illumination.

The electrically controlled liquid crystal polarizing element 11 is disposed on the outgoing light path of the image display device 50. The electronically controlled liquid crystal polarizing element 11 is configured to change the phase of an incident polarized light beam (the first sub-image light beam or the second sub-image light beam) after the control voltage is applied, and change the polarization direction of the first sub-image light beam or the second sub-image light beam to a second linear polarization direction. When the electronically controlled liquid crystal polarizing element 11 changes the phase of the incident polarized light beam by pi phase after the control voltage is applied, the electronically controlled liquid crystal polarizing element 11 is equivalent to a 1/2 glass slide, and the first linear polarization direction and the second linear polarization direction are orthogonal. That is, the first sub-image light and the second sub-image light are collimated parallel light beams having the first linear polarization direction, and the first sub-image light or the second sub-image light after the phase change of the first sub-image light or the second sub-image light by the electronically controlled liquid crystal polarizing element 11 is collimated parallel light beams having the second linear polarization direction. Wherein the first linear polarization direction and the second linear polarization direction are orthogonal.

The first reflection amplifying element 12 and the second reflection amplifying element 13 are sequentially disposed on the outgoing light path of the electronically controlled liquid crystal polarizing element 11. The first reflective amplifying element 12 and the second reflective amplifying element 13 are polarization-sensitive reflective converging elements. The first reflective amplifying element 12 and the second reflective amplifying element 13 are arranged to reflect and converge sub-image light rays of a first linear polarization direction (or a second linear polarization direction) and to transmit sub-image light rays of a second linear polarization direction (or the first linear polarization direction). That is, the first reflective amplifying element 12 and the second reflective amplifying element 13 are arranged to reflect and converge sub-image light rays of the first linear polarization direction and transmit sub-image light rays of the second linear polarization direction. Alternatively, the first reflective amplifying element 12 and the second reflective amplifying element 13 are arranged to reflect and converge sub-image light rays of the second linear polarization direction and to transmit sub-image light rays of the first linear polarization direction.

The phase retarder 14 is disposed between the second reflective amplifying element 13 and the reflective element 15. The phase retarder 14 is used to convert the polarization direction of the sub-image light of the first linear polarization direction (or the second linear polarization direction) into an elliptical polarization direction or a circular polarization direction, and to convert the sub-image light of the elliptical polarization direction or the circular polarization direction reflected from the reflecting element 15 into a non-first linear polarization direction (or a non-second linear polarization direction). Wherein the non-first linear polarization direction comprises a second linear polarization direction and the non-second linear polarization direction comprises the first linear polarization direction. When the retarder 14 is a 1/4 glass slide, the retarder 14 is configured to convert the polarization direction of the sub-image light having the first linear polarization direction (or the second linear polarization direction) into a circular polarization direction, and to completely convert the sub-image light having the circular polarization direction reflected from the reflective element 15 into the second linear polarization direction (or the first linear polarization direction).

The reflecting element 15 is used for transmitting the sub-image light having the elliptical polarization direction or the circular polarization direction transmitted from the phase retarder 14 back toward the second reflective amplifying element 13. Alternatively, the reflective working surface of the reflective element 15 in this embodiment is a total reflection plane. The reflecting working surface of the reflecting element 15 can be a total reflection plane coated with a metal film or a dielectric film, has the function of turning an optical path only, and returns and transmits the original path without enlarging or reducing the size of the sub-image light transmitted from the phase retarder 14.

When the first reflective amplifying element 12 and the second reflective amplifying element 13 are disposed to reflect and converge the sub-image light in the first linear polarization direction and transmit the sub-image light in the second linear polarization direction, the near-eye display system 1 provided in this embodiment performs a virtual image display as follows: dividing one image to be displayed into two sub-images to be displayed in the horizontal direction, and respectively recording the two sub-images to be displayed as a first sub-image to be displayed and a second sub-image to be displayed. As shown in fig. 2, the image display device 50 outputs a first beam of sub-image light according to a first sub-image to be displayed, the first beam of sub-image light being a collimated parallel light beam having a first linear polarization direction. The first sub-image light with the first linear polarization direction is reflected and converged by the first reflection amplifying element 12 after passing through the electrically controlled liquid crystal polarizing element 11 without applying a control voltage to the electrically controlled liquid crystal polarizing element 11, and a first sub-image to be displayed is formed in the human eye. The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. A control voltage is applied to the electrically controlled liquid crystal polarizing element 11 and the second beam of sub-image light having the first linear polarization direction is converted by the electrically controlled liquid crystal polarizing element 11 into a second beam of sub-image light having the second linear polarization direction. Since the first and second reflective amplifying elements 12 and 13 are arranged to reflect and converge sub-image light rays of the first linear polarization direction and transmit sub-image light rays of the second linear polarization direction, the second sub-image light rays having the second linear polarization direction are transmitted to the phase retarder 14 through the first and second reflective amplifying elements 12 and 13. The polarization direction of the second sub-image light having the second linear polarization direction transmitted to the phase retarder 14 is converted into an elliptical polarization direction or a circular polarization direction by the phase retarder 14 and then transmitted to the reflective element 15, and is inverted by the reflective element 15 and then transmitted to the phase retarder 14 again. The second sub-image light of the elliptical polarization direction or the circular polarization direction reflected from the reflecting element 15 is converted into the second sub-image light of the non-second linear polarization direction by the phase retarder 14. The second sub-image light rays with the first linear polarization direction in the second sub-image light rays with the non-second linear polarization direction are reflected and converged by the second reflection amplifying element 13, and a second sub-image to be displayed is formed on the human eye.

When the first reflective amplifying element 12 and the second reflective amplifying element 13 are configured to reflect and converge the sub-image light in the second linear polarization direction and transmit the sub-image light in the first linear polarization direction, the near-eye display system 1 provided in this embodiment performs a virtual image display as follows: dividing one image to be displayed into two sub-images to be displayed in the horizontal direction, and respectively recording the two sub-images to be displayed as a first sub-image to be displayed and a second sub-image to be displayed. As shown in fig. 3, the image display device 50 outputs a first beam of sub-image light according to a first sub-image to be displayed, the first beam of sub-image light being a collimated parallel light beam having a first linear polarization direction. A control voltage is applied to the electronically controlled liquid crystal polarizing element 11, the first sub-image light having the first linear polarization direction is converted by the electronically controlled liquid crystal polarizing element 11 into the first sub-image light having the second linear polarization direction, which is reflected and converged by the first reflective amplifying element 12 to form a first sub-image to be displayed in the human eye. The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. The second sub-image light having the first linear polarization direction is transmitted to the phase retarder 14 through the first reflective amplifying element 12 and the second reflective amplifying element 13 without applying a control voltage to the electrically controlled liquid crystal polarizing element 11. The polarization direction of the second sub-image light having the first linear polarization direction transmitted to the retarder 14 is converted into an elliptical polarization direction or a circular polarization direction by the retarder 14 and then transmitted to the reflective element 15, and is inverted by the reflective element 15 and then transmitted to the retarder 14 again. The second beam of sub-image light reflected from the reflective element 15 in the elliptical polarization direction or the circular polarization direction is converted into a second beam of sub-image light in a non-first linear polarization direction by the phase retarder 14. The second sub-image light rays with the second linear polarization direction in the second sub-image light rays with the non-first linear polarization direction are reflected and converged by the second reflection amplifying element 13, and a second sub-image to be displayed is formed on the human eye.

In the above process, the process of forming the first sub-image to be displayed and the second sub-image to be displayed in the human eye is retinal imaging, so that clear imaging can be performed in the whole display field of view. The first sub-image to be displayed and the second sub-image to be displayed respectively formed on human eyes can be spliced into the images to be displayed visually by adjusting the frequency of outputting each sub-image light by the image display device 50 and the time interval of outputting each image to be displayed, and by matching with adjusting the working state of the electric control liquid crystal polarization element 11, etc., and utilizing the principle of vision residue.

Real world ambient light enters the human eye through the near-eye display optical module 10 to form an ambient image.

According to the near-eye display optical module 10 provided by the embodiment of the invention, through ingenious integration and design of the electric control liquid crystal polarizing element 11, the first reflection amplifying element 12, the second reflection amplifying element 13, the phase delay plate 14 and the reflecting element 15, a first sub-image to be displayed is formed on the human eye and a second sub-image to be displayed is formed on the human eye by the second reflection amplifying element 13 sequentially through the first reflection amplifying element 12, and the first sub-image to be displayed and the second sub-image to be displayed formed on the human eye are spliced into the images to be displayed in a visual sense of a user by utilizing a visual residual effect. Therefore, the angle of view of the near-eye display optical module 10 is equal to the sum of the angles of view of the first reflective amplifying element 12 and the second reflective amplifying element 13. And, the resolutions of the first sub-image to be displayed and the second sub-image to be displayed may be the same and equal to the resolution of the image to be displayed. Therefore, the near-eye display optical module 10 has high resolution while displaying a large field of view image, and has a smaller volume than the near-eye display optical module 10 having a conventional display optical module applied to augmented reality. Meanwhile, the near-eye display optical module 10 enables images after reflection and convergence to have no chromatic aberration based on an imaging method of a reflection imaging principle, and enables centers and edges of the amplified images to have consistent definition based on amplified imaging of beamlets.

Based on the above inventive concept, the specific structure of the near-eye display system 1 may also be, but is not limited to, as shown in fig. 4 to 13 and 15. Since the near-eye display optical module 10 shown in fig. 1 includes two operation principles shown in fig. 2 and 3, and the operation principles shown in fig. 2 and 3 are similar, the operation principles shown in fig. 2 are only described as an example in the descriptions of fig. 5, 6, 8 and 10 for the sake of economy. That is, the first reflective amplifying element 12 and the second reflective amplifying element 13 are arranged to reflect and converge sub-image light rays of a first linear polarization direction and transmit sub-image light rays of a second linear polarization direction, the first sub-image light rays and the second sub-image light rays being collimated parallel light beams having the first linear polarization direction, and the electronically controlled liquid crystal polarizing element 11 changes the phase of the second sub-image light rays. It should be understood that the near-eye display optical module 10 shown in fig. 1 to 15 is presented in a monocular form for convenience of description. One skilled in the art can deduce the structure of the near-eye display optical module 10 when it is binocular according to the structure shown in fig. 1 to 15.

As shown in fig. 4, fig. 4 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the electrically controlled liquid crystal polarizing element 11, the first reflective amplifying element 12, the second reflective amplifying element 13, the phase retarder 14 and the reflective element 15 are filled with a medium having a refractive index between them, so that the space between the electrically controlled liquid crystal polarizing element 11 and the first reflective amplifying element 12 constitutes a first entity V1, the space between the first reflective amplifying element 12 and the second reflective amplifying element 13 constitutes a second entity V2, the space between the second reflective amplifying element 13 and the phase retarder 14 constitutes a third entity V3, and the space between the phase retarder 14 and the reflective element 15 constitutes a fourth entity V4. At this time, the first reflection amplifying element 12 may be an element etched with a reflection diffraction pattern on a transparent substrate, which is glued to the first entity V1 and/or the second entity V2. Alternatively, the first reflective amplifying element 12 may also be a surface of the first entity V1 adjacent to the second entity V2 or a surface of the second entity V2 adjacent to the first entity V1, where a surface of the first entity V1 adjacent to the second entity V2 or a surface of the second entity V2 adjacent to the first entity V1 is etched with a reflective diffraction pattern. Similarly, the second reflective amplifying element 13 may be an element with a reflective diffraction pattern etched on a transparent substrate, which is glued to the second entity V2 and/or the third entity V3. Alternatively, the second reflective amplifying element 13 may be a surface of the second entity V2 adjacent to the third entity V3 or a surface of the third entity V3 adjacent to the second entity V2, where a surface of the second entity V2 adjacent to the third entity V3 or a surface of the third entity V3 adjacent to the second entity V2 is etched with a reflective diffraction pattern. Similarly, the reflecting element 15 may be a total reflection plane with a metal film or a dielectric film coated on the reflecting working surface. Alternatively, the reflecting element 15 may be a surface of the fourth entity V4 facing away from the retarder 14, the surface of the fourth entity V4 facing away from the retarder 14 being coated with a metal film or a dielectric film.

When the first reflective amplifying element 12 may be a surface of the first entity V1 near the second entity V2 or a surface of the second entity V2 near the first entity V1, the second reflective amplifying element 13 is a surface of the second entity V2 near the third entity V3 or a surface of the third entity V3 near the second entity V2, and the reflective element 15 is a surface of the fourth entity V4 far from the retarder 14, the electrically controlled liquid crystal polarizing element 11 is glued together with the first entity V1, the second entity V2 is glued together with the first entity V1 and the third entity V3, and the retarder 14 is glued together with the third entity V3 and the fourth entity V4, thereby forming the integrated near-eye display optical module 10.

The refractive indices of the first, second, third and fourth entities V1, V2, V3 and V4 may be the same or different from each other. It is obvious that when the medium of the reflective diffraction exit space of the first reflective amplifying element 12 and the second reflective amplifying element 13 is not air anymore but a medium having a refractive index, the reflective diffraction patterns thereof should be designed correspondingly according to the set refractive index of the medium.

The near-eye display optical module 10 provided in this embodiment has the advantages of reducing the difficulty of installation and assembly, simplifying the external support structure of the near-eye display optical module 10, facilitating mass production, and the like.

Referring to fig. 5, fig. 5 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the near-eye display optical module 10 further comprises a first optical device 16 arranged between the phase retarder 14 and the reflective element 15. The refractive transmission focal plane of the first optical device 16 is coplanar with the reflection plane of the reflective element 15. The first optical device 16 may be a single optical lens or a multi-optical lens group. The second sub-image light having an elliptical or circular polarization direction transmitted from the phase retarder 14 is condensed by the first optical device 16 and reflected by the reflecting element 15, and the condensed second sub-image light is collimated again by the first optical device 16 into a second sub-image light having a parallel form, which is identical in size to the second sub-image light outputted from the image display device 50. The required convergence can be achieved by providing the first optical means 16 such that the reflective convergence of the second reflective amplifying element 13 is low.

Referring to fig. 6, fig. 6 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the near-eye display optical module 10 further includes an electrically controlled optical device 17 disposed between the electrically controlled liquid crystal polarizing element 11 and the first reflective amplifying element 12, and a reflective working surface on which the reflecting element 15 is disposed has a function of converging parallel light beams. In particular, the reflective working surface of the reflective element 15 may be a concave reflective curved surface or a reflective diffraction plane having a concave reflective equivalent function. Alternatively, in the present embodiment, the reflection working surface of the reflection element 15 is a concave reflection curved surface. When a control voltage is applied to the electro-optic 17, the electro-optic 17 has a converging function for the parallel light beams. The refraction-transmission focal plane of the electronically controlled optical device 17 is arranged to substantially coincide with the reflection focal plane of the reflection working plane of the reflection element 15, so that the second sub-image light having the second linear polarization direction transmitted from the electronically controlled liquid crystal polarizing element 11 is converged by the electronically controlled optical device 17 and is reflected by the reflection element 15 and collimated into a sub-image light having the same size as the second sub-image light. The electronic control optical device 17 may be a liquid crystal lens or a liquid lens in the known art, which is not limited herein. Specifically, the procedure of performing one virtual image display by the near-eye display optical module 10 provided in this embodiment is as follows: the image display device 50 outputs a first sub-image light beam according to the first sub-image to be displayed, the first sub-image light beam being a collimated parallel light beam having a first linear polarization direction. The control voltage is not applied to the electrically controlled liquid crystal polarizing element 11 and the electrically controlled optical device 17, and the first sub-image light with the first linear polarization direction is reflected and converged by the first reflection amplifying element 12 after passing through the electrically controlled liquid crystal polarizing element 11, so as to form a first sub-image to be displayed on human eyes. The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. A control voltage is applied to the electrically controlled liquid crystal polarizing element 11 and the second beam of sub-image light having the first linear polarization direction is converted by the electrically controlled liquid crystal polarizing element 11 into a second beam of sub-image light having the second linear polarization direction. The control voltage is applied to the electronic control optical device 17, the second sub-image light with the second linear polarization direction is converged by the electronic control optical device 17, the converged second sub-image light sequentially passes through the first reflection amplifying element 12 and the second reflection amplifying element 13, the polarization direction of the converged second sub-image light is converted into the elliptical polarization direction or the circular polarization direction after passing through the phase delay sheet 14, the converged second sub-image light with the elliptical polarization direction or the circular polarization direction is reflected by the reflection element 15 and collimated into the sub-image light with the consistent size of the second sub-image light outputted from the image display device 50, the collimated second sub-image light with the elliptical polarization direction or the circular polarization direction is converted into the non-second linear polarization direction after passing through the phase delay sheet 14 again, and the second sub-image light with the first linear polarization direction in the non-second sub-image light with the second linear polarization direction is reflected and converged by the second reflection amplifying element 13, so that a second sub-image to be displayed on the human eye is formed.

The refractive transmission focal plane of the electronically controlled optical device 17 is arranged to substantially coincide with the reflective focal plane of the reflective working surface of the reflective element 15 such that the plane from which the second sub-image light having the second linear polarization direction from the electronically controlled liquid crystal polarizing element 11 is converged by the electronically controlled optical device 17 is located at the reflective focal plane of the reflective element 15. When the reflection focal length F5 of the reflection working surface of the reflection element 15 is identical to the refraction transmission focal length F7 of the electronic control optical device 17, the second beam of sub-image light after reflection conversion by the reflection element 15 has the same image resolution as the second beam of sub-image light output by the image display device 50. In practical implementation, the reflection focal length F5 of the reflection working surface of the reflection element 15 may be not identical to the refraction and transmission focal length F7 of the electronic control optical device 17, where the resolution of the second beam of sub-image light after reflection and conversion by the reflection element 15 may be increased or decreased to a certain extent compared with the resolution of the second beam of sub-image light output by the image display device 50.

Similarly, similarly to fig. 4, a medium having a refractive index may be filled between the electrically controlled optical device 17, the first reflection amplifying element 12, the second reflection amplifying element 13, the phase retarder 14, and the reflection element 15, as shown in fig. 7. So that the space between the electrically controlled optics 17 and the first reflective amplifying element 12 constitutes a fifth entity V5, so that the space between the first reflective amplifying element 12 and the second reflective amplifying element 13 constitutes a sixth entity V6, so that the space between the second reflective amplifying element 13 and the phase retarder 14 constitutes a seventh entity V7, so that the space between the phase retarder 14 and the reflective element 15 constitutes an eighth entity V8. At this time, the first reflection amplifying element 12 may be an element etched with a reflection diffraction pattern on a transparent substrate, which is glued with the fifth entity V5 and/or the sixth entity V6. Alternatively, the first reflective amplifying element 12 may also be a surface of the fifth entity V5 adjacent to the sixth entity V6 or a surface of the sixth entity V6 adjacent to the fifth entity V5, where a surface of the fifth entity V5 adjacent to the sixth entity V6 or a surface of the sixth entity V6 adjacent to the fifth entity V5 is etched with a reflective diffraction pattern. Similarly, the second reflective amplifying element 13 may be an element with a reflective diffraction pattern etched on a transparent substrate, which is glued to the sixth entity V6 and/or the seventh entity V7. Alternatively, the second reflection amplifying element 13 may be a surface of the sixth entity V6 near the seventh entity V7 or a surface of the seventh entity V7 near the sixth entity V6, where a surface of the sixth entity V6 near the seventh entity V7 or a surface of the seventh entity V7 near the sixth entity V6 is etched with a reflection diffraction pattern. Similarly, the reflective element 15 may be a concave surface with a total reflection film coating on the reflective working surface. Alternatively, the reflecting element 15 may be a surface of the eighth entity V8 facing away from the retarder 14, and the surface of the eighth entity V8 facing away from the retarder 14 is concave toward the retarder 14 and is coated with a total reflection film.

When the first reflective amplifying element 12 is the surface of the fifth entity V5 near the sixth entity V6 or the surface of the sixth entity V6 near the fifth entity V5, the second reflective amplifying element 13 is the surface of the sixth entity V6 near the seventh entity V7 or the surface of the seventh entity V7 near the sixth entity V6, and the reflective element 15 is the surface of the eighth entity V8 far from the retarder 14, the electrically controlled liquid crystal polarizing element 11, the electrically controlled optical device 17 and the fifth entity V5 are glued together, the sixth entity V6 and the fifth entity V5 and the seventh entity V7 are glued together, respectively, and the retarder 14 and the seventh entity V7 and the eighth entity V8 are glued together, thereby forming the integrated near-eye display optical module 10.

The refractive indices of the fifth, sixth, seventh and eighth entities V5, V6, V7 and V8 may be the same or different from each other. It is obvious that when the medium of the reflective diffraction exit space of the first reflective amplifying element 12 and the second reflective amplifying element 13 is not air anymore but a medium having a refractive index, the reflective diffraction patterns thereof should be designed correspondingly according to the set refractive index of the medium.

As shown in fig. 8, fig. 8 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 6, the difference is that: the electronically controlled optics 17 are replaced by second optics 18 with fixed converging capabilities and the first reflective amplifying element 12 has the function of reflecting and converging the incident converging light beam. For example, the reflective diffraction pattern of the first reflective amplifying element 12 has reflective diffraction characteristics of an off-axis convex mirrorImaging properties. In the design parameters of the optical design software zemax, each parameter of the off-axis convex reflector can be that the radius of curvature of the vertex is 60mm, and the quadratic constant, the fourth order coefficient and the sixth order coefficient of the aspheric surface are respectively-0.0710, -4.2e ^-6 、1.15e ^-9 The off-axis amount in the vertical direction was 24.9.

Similarly, similar to fig. 4 and 7, the components of the near-eye display optical module 10 shown in fig. 8 may be filled with a medium having a refractive index, so as to form an integrated near-eye display optical module 10, so as to reduce the difficulty of installation and assembly, simplify the external supporting structure of the near-eye display optical module 10, facilitate mass production, and the like, as shown in fig. 9. For the sake of space saving, details are not described here.

As shown in fig. 10, fig. 10 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the reflection working surface of the reflection element 15 has a function of converging parallel light beams, and the second reflection amplifying element 13 is provided to perform a function of reflecting and converging incident divergent light beams. For example, the second reflective amplifying element 13 may be provided with an imaging property of an ellipsoidal curved surface having two focal points, and any one of the light rays emitted from one of the focal points passes through the other focal point after being reflected by the ellipsoidal curved surface. Any light beam emitted from the focal point F1 will be reflected and diffracted to the focal point F2 after passing through the second reflective amplifying element 13. In an embodiment, the image display device 50 outputs a first sub-image light according to the first sub-image to be displayed, where the first sub-image light is a collimated parallel light beam having a first linear polarization direction. The first sub-image light with the first linear polarization direction is reflected and converged by the first reflection amplifying element 12 after passing through the electrically controlled liquid crystal polarizing element 11 without applying a control voltage to the electrically controlled liquid crystal polarizing element 11, and a first sub-image to be displayed is formed in the human eye. The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. A control voltage is applied to the electrically controlled liquid crystal polarizing element 11 and the second beam of sub-image light having the first linear polarization direction is converted by the electrically controlled liquid crystal polarizing element 11 into a second beam of sub-image light having the second linear polarization direction. The second sub-image light with the second linear polarization direction is transmitted through the first reflective amplifying element 12, the second reflective amplifying element 13 and the retarder 14 in sequence, the polarization direction of the second sub-image light is converted into an elliptical polarization direction or a circular polarization direction, the second sub-image light with the elliptical polarization direction or the circular polarization direction is reflected by the reflective element 15, is transmitted through the retarder 14 again and is converged at the focus F1, and the second sub-image light converged at the focus F1 is reflected and diffracted by the second reflective amplifying element 13 to the focus F2, so that a second sub-image to be displayed is formed.

Similarly, similar to fig. 4, 7 and 9, the components of the near-eye display optical module 10 shown in fig. 10 may be filled with a medium having a refractive index, so as to form an integrated near-eye display optical module 10, so as to reduce the difficulty of installation and assembly, simplify the external supporting structure of the near-eye display optical module 10, facilitate mass production, and so on, which are not described herein.

As shown in fig. 11, fig. 11 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the near-eye display optical module 10 further includes a polarization conversion element 19 disposed between the first reflection amplifying element 12 and the second reflection amplifying element 13, and the second reflection amplifying element 13 and the first reflection amplifying element 12 are different in polarization sensitivity. If the first reflective amplifying element 12 is arranged to reflect and concentrate sub-image light rays of the first linear polarization direction and to transmit sub-image light rays of the second linear polarization direction, the second reflective amplifying element 13 is arranged to reflect and concentrate sub-image light rays of the second linear polarization direction and to transmit sub-image light rays of the first linear polarization direction. If the first reflective amplifying element 12 is arranged to reflect and concentrate sub-image light rays of the second linear polarization direction and to transmit sub-image light rays of the first linear polarization direction, the second reflective amplifying element 13 is arranged to reflect and concentrate sub-image light rays of the first linear polarization direction and to transmit sub-image light rays of the second linear polarization direction. The pi phase retardation can be increased per the sub-image light having the linear polarization direction passes through the polarization conversion element 19, so that the polarization direction of the sub-image light can be converted into a polarization direction orthogonal thereto.

When the first reflective amplifying element 12 is configured to reflect and converge the sub-image light in the first linear polarization direction and transmit the sub-image light in the second linear polarization direction, the second reflective amplifying element 13 is configured to reflect and converge the sub-image light in the second linear polarization direction and transmit the sub-image light in the first linear polarization direction, and the process of performing the virtual image display once is as follows: the image display device 50 outputs a first sub-image light beam according to the first sub-image to be displayed, the first sub-image light beam being a collimated parallel light beam having a first linear polarization direction. The first sub-image light with the first linear polarization direction is reflected and converged by the first reflection amplifying element 12 after passing through the electrically controlled liquid crystal polarizing element 11 without applying a control voltage to the electrically controlled liquid crystal polarizing element 11, and a first sub-image to be displayed is formed in the human eye. The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. A control voltage is applied to the electrically controlled liquid crystal polarizing element 11 and the second beam of sub-image light having the first linear polarization direction is converted by the electrically controlled liquid crystal polarizing element 11 into a second beam of sub-image light having the second linear polarization direction. The second sub-image light having the second linear polarization direction is transmitted through the first reflective amplifying element 12, and is transmitted through the second reflective amplifying element 13 to the retarder 14 after being converted into the first linear polarization direction by the polarization conversion element 19. The polarization direction of the second sub-image light having the first linear polarization direction transmitted to the retarder 14 is converted into an elliptical polarization direction or a circular polarization direction by the retarder 14 and then transmitted to the reflective element 15, and is inverted by the reflective element 15 and then transmitted to the retarder 14 again. The second beam of sub-image light reflected from the reflective element 15 in the elliptical polarization direction or the circular polarization direction is converted into a second beam of sub-image light in a non-first linear polarization direction by the phase retarder 14. The second sub-image light rays with the second linear polarization direction in the second sub-image light rays with the non-first linear polarization direction are reflected and converged by the second reflection amplifying element 13, and a second sub-image to be displayed is formed on the human eye.

When the first reflective amplifying element 12 is configured to reflect and converge the sub-image light in the second linear polarization direction and transmit the sub-image light in the first linear polarization direction, the second reflective amplifying element 13 is configured to reflect and converge the sub-image light in the first linear polarization direction and transmit the sub-image light in the second linear polarization direction, and the process of performing the virtual image display once is as follows: the image display device 50 outputs a first sub-image light beam according to the first sub-image to be displayed, the first sub-image light beam being a collimated parallel light beam having a first linear polarization direction. A control voltage is applied to the electronically controlled liquid crystal polarizing element 11, the first sub-image light having the first linear polarization direction is converted by the electronically controlled liquid crystal polarizing element 11 into the first sub-image light having the second linear polarization direction, which is reflected and converged by the first reflective amplifying element 12 to form a first sub-image to be displayed in the human eye. The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. The second sub-image light having the first linear polarization direction is transmitted through the first reflective amplifying element 12 without applying a control voltage to the electronically controlled liquid crystal polarizing element 11, is converted into the second linear polarization direction by the polarization conversion element 19, and is transmitted through the second reflective amplifying element 13 to the retarder 14. The polarization direction of the second sub-image light having the second linear polarization direction transmitted to the phase retarder 14 is converted into an elliptical polarization direction or a circular polarization direction by the phase retarder 14 and then transmitted to the reflective element 15, and is inverted by the reflective element 15 and then transmitted to the phase retarder 14 again. The second sub-image light of the elliptical polarization direction or the circular polarization direction reflected from the reflecting element 15 is converted into the second sub-image light of the non-second linear polarization direction by the phase retarder 14. The second sub-image light rays with the first linear polarization direction in the second sub-image light rays with the non-second linear polarization direction are reflected and converged by the second reflection amplifying element 13, and a second sub-image to be displayed is formed on the human eye.

As shown in fig. 12, fig. 12 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the near-eye display optical module 10 further includes an absorption-type polarizing element 21, and the first reflection amplifying element 12 and the second reflection amplifying element 13 are concave reflection converging elements having continuous curved surfaces. The absorption type polarizing element 21 is disposed in the reflection convergence direction of the first reflection amplifying element 12 and the second reflection amplifying element 13, and is used for absorbing the sub-image light in the second linear polarization direction (or the first linear polarization direction), and transmitting the sub-image light in the first linear polarization direction (or the second linear polarization direction), so as to eliminate the background interference and improve the contrast ratio of the first sub-image to be displayed and the second sub-image to be displayed. When the first reflective amplifying element 12 and the second reflective amplifying element 13 are arranged to reflect and converge the sub-image light in the first linear polarization direction and transmit the sub-image light in the second linear polarization direction, the absorption type polarizing element 21 is used to absorb the sub-image light in the second linear polarization direction and transmit the sub-image light in the first linear polarization direction. When the first reflective amplifying element 12 and the second reflective amplifying element 13 are arranged to reflect and converge the sub-image light in the second linear polarization direction and transmit the sub-image light in the first linear polarization direction, the absorption type polarizing element 21 is used to absorb the sub-image light in the first linear polarization direction and transmit the sub-image light in the second linear polarization direction.

The absorption-type polarizing element 21 is configured to absorb sub-image light rays of the second linear polarization direction when the first reflection amplifying element 12 and the second reflection amplifying element 13 are arranged to reflect and converge sub-image light rays of the first linear polarization direction and transmit sub-image light rays of the second linear polarization direction. In performing the virtual image display once, the image display device 50 outputs a first sub-image light according to the first sub-image to be displayed, where the first sub-image light is a collimated parallel light beam having a first linear polarization direction. The control voltage is not applied to the electric control liquid crystal polarizing element 11, and most of the first beam of sub-image light with the first linear polarization direction is reflected and converged by the first reflection amplifying element 12 after passing through the electric control liquid crystal polarizing element 11, and forms a first sub-image to be displayed on human eyes through the absorption type polarizing element 21; a small part of the light beams of the first beam of sub-images with the second linear polarization direction are reflected by the second reflection amplifying element 13 and the absorption type polarizing element 21 after being transmitted through the first reflection amplifying element 12, the second reflection amplifying element 13 and the phase delay plate 14, and then reflected by the reflection element 15, pass through the phase delay plate 14 again, and the polarization direction is converted from the first linear polarization direction to the second linear polarization direction, and a small part of the light beams of the first beam of sub-images with the second linear polarization direction are absorbed by the absorption type polarizing element 21 after being reflected by the second reflection amplifying element 13 (while most part of the light beams pass through the second reflection amplifying element 13). The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. A control voltage is applied to the electrically controlled liquid crystal polarizing element 11 and the second beam of sub-image light having the first linear polarization direction is converted by the electrically controlled liquid crystal polarizing element 11 into a second beam of sub-image light having the second linear polarization direction. The second sub-image light with the second linear polarization direction is mostly reflected by the reflecting element 15 after passing through the first reflecting amplifying element 12, the second reflecting amplifying element 13 and the phase retarder 14, and then passes through the phase retarder 14 again, and is converted into the second sub-image light with the non-second linear polarization direction by the phase retarder 14, and the second sub-image light with the first linear polarization direction in the second sub-image light with the non-second linear polarization direction is reflected and converged by the second reflecting amplifying element 13, and passes through the absorption type polarizing element 21, so that a second sub-image to be displayed is formed on the human eye. A small portion of the second sub-image light having the second linear polarization direction is reflected by the first reflective amplifying element 12 and then absorbed by the absorptive polarizing element 21.

The absorption-type polarizing element 21 is configured to absorb sub-image light rays of the first linear polarization direction when the first reflection amplifying element 12 and the second reflection amplifying element 13 are arranged to reflect and converge sub-image light rays of the second linear polarization direction and transmit sub-image light rays of the first linear polarization direction. In performing the virtual image display once, the image display device 50 outputs a first sub-image light according to the first sub-image to be displayed, where the first sub-image light is a collimated parallel light beam having a first linear polarization direction. Applying a control voltage to the electrically controlled liquid crystal polarizing element 11, converting the first sub-image light with the first linear polarization direction into the first sub-image light with the second linear polarization direction by the electrically controlled liquid crystal polarizing element 11, wherein most of the first sub-image light with the second linear polarization direction is reflected and converged by the first reflection amplifying element 12, and the first sub-image to be displayed is formed on the human eye through the absorption type polarizing element 21; a small part of the first sub-image light rays with the first linear polarization direction are reflected by the second reflective amplifying element 13 and then reflected by the reflective element 15 and pass through the phase retarder 14 again, the polarization direction is converted from the second linear polarization direction to the first linear polarization direction, and a small part of the first sub-image light rays with the first linear polarization direction are absorbed by the absorption type polarizing element 21 after being reflected by the second reflective amplifying element 13 (while a large part of the first sub-image light rays are transmitted through the second reflective amplifying element 13). The image display device 50 outputs a second beam of sub-image light according to the second sub-image to be displayed, the second beam of sub-image light being a collimated parallel light beam having the first linear polarization direction. The second sub-image light having the first linear polarization direction is mostly transmitted to the phase retarder 14 through the first reflective amplifying element 12 and the second reflective amplifying element 13 without applying a control voltage to the electrically controlled liquid crystal polarizing element 11. The second sub-image light with the first linear polarization direction is mostly reflected by the reflecting element 15 after passing through the first reflecting amplifying element 12, the second reflecting amplifying element 13 and the phase retarder 14, and then passes through the phase retarder 14 again, and is converted into the second sub-image light with the non-first linear polarization direction by the phase retarder 14, and the second sub-image light with the second linear polarization direction in the second sub-image light with the non-first linear polarization direction is reflected and converged by the second reflecting amplifying element 13, and passes through the absorption type polarizing element 21, so that a second sub-image to be displayed is formed on the human eye. A small portion of the second sub-image light having the first linear polarization direction is reflected by the first reflective amplifying element 12 and then absorbed by the absorptive polarizing element 21.

Because the reflective working surfaces of the first reflective amplifying element 12 and the second reflective amplifying element 13 are continuous concave surfaces, the polarizing reflective film layer plated on the concave surfaces thereof cannot completely achieve the reflection convergence of the first linear polarization direction and the transmission of the second linear polarization direction or the reflection convergence of the second linear polarization direction and the transmission of the first linear polarization direction in theory and in actual plating process, so that the absorption type polarizing element 21 is arranged in the reflection convergence direction of the first reflective amplifying element 12 and the second reflective amplifying element 13 and can absorb the light rays of the sub-images in the second linear polarization direction (or the first linear polarization direction), thereby eliminating background interference and improving the contrast ratio of the first sub-image to be displayed and the second sub-image to be displayed.

Similarly, for the near-eye display system 1 provided in other embodiments of the present invention, the absorption type polarizing element 21 may be disposed in the reflection convergence direction of the first reflection amplifying element 12 and the second reflection amplifying element 13 or one type of absorption type polarizing element may be disposed respectively, so as to eliminate background interference and improve the contrast ratio between the first sub-image to be displayed and the second sub-image to be displayed, which is not described herein.

Referring to fig. 13, fig. 13 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the near-eye display optical module 10 further comprises a beam expanding system 22, wherein the beam expanding system 22 is arranged on one side of the electrically controlled liquid crystal polarizing element 11 away from the first reflection amplifying element 12. The beam expanding system 22 is used to convert a beam having a small-size spot into a beam having a large-size spot. The beam expanding system 22 can be applied not only to the near-eye display optical module 10 shown in fig. 1 to form the structure shown in fig. 13, but also to the near-eye display optical module 10 shown in fig. 2 to 12 to form a new structure. When the beam expanding system 22 is applied to the near-eye display optical module 10 shown in fig. 1 to 5, 10, 11, 12 and 13, the small-size light spot refers to the light beam having a smaller spot size than the effective optical aperture required by the preset first reflective amplifying element 12 or the preset second reflective amplifying element 13, and the large-size light spot refers to the light beam having a spot size consistent with the effective optical aperture required by the preset first reflective amplifying element 12 or the preset second reflective amplifying element 13. When the beam expanding system 22 is applied to the near-eye display optical module 10 shown in fig. 6, 7, 8 and 9, the small-size light spot refers to that the light spot size of the light beam is smaller than the effective optical aperture required by the preset second optical device 18 or the electric control optical device 17, and the large-size light spot refers to that the light spot size of the light beam is consistent with the effective optical aperture required by the preset second optical device 18 or the electric control optical device 17.

The beam expanding system 22 may be an inverted telescopic system, and the telescopic system is generally formed by an objective lens and an eyepiece, wherein an image side focal point of the objective lens and an object side focal point of the eyepiece are coincident, and the telescopic system has two structural forms of kepler and galilean. When the telescopic system is used reversely, the light beam with the small-size light spot is converged or diverged through the ocular lens first, and then is collimated into the light beam with the large-size light spot by the objective lens. The image display device 50 having a small-sized spot beam can obtain a large beam convergence angle by using the beam expanding system 22 in the present embodiment, thereby enabling a large display field angle. As shown in fig. 13 and 14, the angle of view afa2 of the image display device 50 having the small-size spot beam reflected and amplified by the first reflection and amplification element 12 is smaller than the angle of view afa1 of the image display device 50 having the large-size spot beam reflected and amplified by the first reflection and amplification element 12 after being expanded by the beam expansion system 22.

As shown in fig. 15, fig. 15 is a block diagram of a near-eye display system 1 according to another embodiment. Similar to fig. 1, the difference is that: the near-eye display optical module 10 further comprises a beam shrinking system 23, wherein the beam shrinking system 23 is arranged on one side of the electrically controlled liquid crystal polarizing element 11 away from the first reflection amplifying element 12. The beam expanding system 22 is used to convert a beam having a large-size spot into a beam having a small-size spot. The beam condensing system 23 can be applied not only to the near-eye display optical module 10 shown in fig. 1 to form the structure shown in fig. 13, but also to the near-eye display optical module 10 shown in fig. 2 to 12 to form a new structure. When the beam condensing system 23 is applied to the near-eye display optical module 10 shown in fig. 1 to 5, 10, 11, 12 and 13, the large-size light spot refers to that the light spot size of the light beam is larger than the effective optical aperture required by the preset first reflection amplifying element 12 or the preset second reflection amplifying element 13, and the small-size light spot refers to that the light spot size of the light beam is consistent with the effective optical aperture required by the preset first reflection amplifying element 12 or the preset second reflection amplifying element 13. When the beam condensing system 23 is applied to the near-eye display optical module 10 shown in fig. 6, 7, 8 and 9, the small-size light spot refers to that the light spot size of the light beam is smaller than the effective optical aperture required by the preset second optical device 18 or the electric control optical device 17, and the large-size light spot refers to that the light spot size of the light beam is consistent with the effective optical aperture required by the preset second optical device 18 or the electric control optical device 17.

The beam condensing system 23 may be a telescopic system, and when the telescopic system is used, a beam with a large-size light spot is first converged or diverged through the objective lens, and then collimated by the eyepiece lens into a beam with a small-size light spot. The image display device 50 having a large-sized spot beam can be fully reflected and amplified by the first reflection amplifying element 12 or the second reflection amplifying element 13 by using the beam condensing system 23 in the present embodiment, the large-sized image display device 50 can be used for the near-eye display optical module 10 by using the beam condensing system 23 in the present embodiment and optimal energy utilization can be obtained.

According to the near-eye display optical module 10 and the near-eye display system 1 provided by the embodiment of the invention, through ingenious integration and design of the electric control liquid crystal polarizing element 11, the first reflection amplifying element 12, the second reflection amplifying element 13, the phase delay plate 14 and the reflecting element 15, a first sub-image to be displayed is formed on the human eye and a second sub-image to be displayed is formed on the human eye by the first reflection amplifying element 12 in sequence, and the first sub-image to be displayed and the second sub-image to be displayed formed on the human eye are spliced into the images to be displayed in a visual sense of a user by utilizing a visual residual effect. Therefore, the angle of view of the near-eye display optical module 10 and the near-eye display system 1 is equal to the sum of the angles of view of the first reflective amplifying element 12 and the second reflective amplifying element 13. And, the resolutions of the first sub-image to be displayed and the second sub-image to be displayed may be the same and equal to the resolution of the image to be displayed. Therefore, the near-eye display optical module 10 and the near-eye display system 1 have high resolution while displaying large field of view images, and have smaller volume than the near-eye display optical module 10 and the near-eye display system 1 having conventional display optical modules applied to augmented reality. Meanwhile, the near-eye display optical module 10 and the near-eye display system 1 have no chromatic aberration based on the imaging method of the reflection imaging principle, and have consistent definition based on the magnified imaging of the beamlets.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The near-eye display optical module is characterized by comprising an electric control liquid crystal polarizing element, a first reflection amplifying element, a second reflection amplifying element, a phase delay plate and a reflecting element;

2. The near-eye display optical module of claim 1 further comprising a first optic disposed between the phase retarder and the reflective element, a refractive transmission focal plane of the first optic being coplanar with a reflection plane of the reflective element.

3. The near-eye display optical module of claim 1, further comprising an electrically controlled optical device disposed between the electrically controlled liquid crystal polarizing element and the first reflective amplifying element for converging the parallel light beam when the control voltage is applied, and a reflective working surface provided with the reflective element has a function of converging the parallel light beam.

4. The near-eye display optical module of claim 1 further comprising a second optical device having a converging function disposed between the electronically controlled liquid crystal polarizing element and the first reflective amplifying element, and wherein the first reflective amplifying element has a function of reflecting and converging an incident converging light beam and a reflective working surface on which the reflective element is disposed has a function of converging a parallel light beam.

5. The near-eye display optical module of claim 1 wherein the reflective working surface of the reflective element has a function of converging parallel light beams, and the second reflective amplifying element has an imaging property of an ellipsoidal curved surface.

6. The near-eye display optical module of any one of claims 1-5, further comprising a polarization conversion element disposed between the first reflective amplifying element and the second reflective amplifying element, and wherein the second reflective amplifying element and the first reflective amplifying element are different in polarization sensitivity.

7. The near-eye display optical module of any one of claims 1-5, further comprising an absorptive polarizing element disposed in a direction of reflection convergence of the first reflective amplifying element and the second reflective amplifying element.

8. The near-eye display optical module of any one of claims 1-5, further comprising a beam expanding system or a beam shrinking system.

9. The near-eye display optical module of any one of claims 1-5, wherein a medium having a refractive index is filled between elements of the near-eye display optical module.

10. A near-eye display system comprising an image display device and a near-eye display optical module according to any one of claims 1-9.