CN115390240A

CN115390240A - AR optical system and AR eyeglasses

Info

Publication number: CN115390240A
Application number: CN202110554679.9A
Authority: CN
Inventors: 刘海峰; 张韦韪; 左惟涵
Original assignee: Shenzhen Huynew Technology Co ltd
Current assignee: Shenzhen Huynew Technology Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-11-25

Abstract

The invention discloses an AR optical system and AR glasses, the AR optical system includes: the device comprises a light-emitting component, a light splitting unit and a transflective unit; the light splitting unit is positioned on an emergent light path of the light emitting component, and the transflective unit is positioned on the emergent light path of the light splitting unit; the light splitting unit includes: the phase delay element and the reflection polarization element are arranged along the optical path in sequence; the phase delay part is arranged close to the light-emitting component; the thickness T of the phase delay piece is less than or equal to 18um. By applying the technical scheme of the invention, human eyes can not feel the problem of double images when watching images, and the visual experience is improved.

Description

AR optical system and AR eyeglasses

Technical Field

The invention relates to the technical field of augmented reality, in particular to an AR optical system and AR glasses.

Background

With the continuous development of virtual reality and augmented reality technologies in recent years, the AR glasses are gradually and widely applied to the field of daily life, an AR optical system mainly plays a role in the AR glasses, and the AR optical system has the characteristic of stereoscopic display and has a good development prospect. However, in the existing AR optical system, the light is transmitted and reflected in the form of the phase retarder and the reflective polarizer, and the light is reflected at the interface of the phase retarder first and then reflected by the reflective polarizer, so that both reflections can be imaged by the imaging system, and thus, the human eye still has the problem of double images when viewing images, which affects the visual effect.

Disclosure of Invention

The invention mainly aims to provide an AR optical system and AR glasses, aiming at solving the problem that human eyes can generate double images when watching images.

To achieve the above object, the present invention provides an AR optical system, comprising: the device comprises a light-emitting component, a light splitting unit and a transflective unit; the light splitting unit is positioned on an emergent light path of the light emitting component, and the transflective unit is positioned on the emergent light path of the light splitting unit;

the light splitting unit includes: the phase delay element and the reflection polarization element are arranged along the optical path in sequence; the phase delay part is arranged close to the light-emitting component; the thickness T of the phase delay piece is less than or equal to 18um.

Optionally, the thickness T of the phase delay member is ≦ 10um.

Optionally, the light splitting unit further includes: a glue layer disposed between the phase retarder and the reflective polarizer for bonding the phase retarder to the reflective polarizer, wherein a thickness d of the glue layer satisfies: d <20um.

Optionally, the light splitting unit further includes: and the absorption polarization piece is arranged on one side of the reflection polarization piece far away from the light-emitting component.

Optionally, the phase delay member comprises: a liquid crystal phase retarder.

The present invention further provides an AR glasses, including the above AR optical system, the AR optical system includes:

the device comprises a light-emitting component, a light splitting unit and a transflective unit; the light splitting unit is positioned on an emergent light path of the light emitting component, and the transflective unit is positioned on the emergent light path of the light splitting unit;

In the technical scheme of the invention, the thickness T of the phase delay member in the light splitting unit is limited, so that human eyes cannot feel the problem of double images when watching images, and the visual experience of a user is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of an embodiment of an AR optical system in the prior art;

FIG. 2 is a schematic diagram of an embodiment of the AR optical system of FIG. 1 for generating ghosts;

FIG. 3 is a schematic diagram of a thickness structure of a phase retarder of an AR optical system provided in the present invention;

FIG. 4 is a schematic diagram illustrating contrast in imaging of an AR optical system provided by the present invention at different thicknesses of a phase retarder;

fig. 5 is a schematic diagram illustrating contrast of images of the AR optical system provided by the present invention at different thicknesses of the phase retarder.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name(s)
				1	Light emitting assembly	3	Transflective unit
2	Light splitting unit	201	Absorbing polarizer
				202	Reflective polarizer	203	Phase delay member
204	Cementing layer

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Fig. 1 is a schematic diagram showing the structure of an AR optical system in the prior art. The AR optical system includes: the light-emitting component 1, the light splitting unit 2 and the transflective unit 3 are arranged along a light path in sequence. The ideal light path trend of the AR optical system is as follows: the light emitting assembly 1 is configured to emit an image light beam L1, and the light splitting unit 2 is configured to reflect the incident image light beam L1 to the transflective unit 3. The transflective unit 3 is used for reflecting the image beam line L1 and transmitting ambient light from the external real environment; the image light beam L1 reflected by the transflective unit 3 and the transmitted external effective light beam L2 reach the light splitting unit 2, and enter human eyes simultaneously after being transmitted by the light splitting unit 2, so that a user can see the external real environment and can also see the image light superimposed in the real environment, and the augmented reality effect is realized.

As shown in fig. 1 and fig. 2, the light splitting unit 2 generally includes, in sequence: a reflective polarizer 202 and a phase retarder 203; the phase retarder 203 is located adjacent to the light emitting assembly 1 and the reflective polarizer 202 is located away from the light emitting assembly 1.

The phase retarder 203 is used for performing interface reflection on a part of the incident image light beam and transmitting the part of the incident image light beam to the transflective unit 3; another part of the image beam is transmitted to the reflective polarizer 202 through the phase retarder 203, and then reflected to the transflective unit 3 through the reflective polarizer 202. The retarder 203 may be a liquid crystal retarder, and the reflective polarizer 202 may be an APF film, or other film material having a reflective polarization function for light. However, the incident image beam forms two images after being reflected by the phase retardation member 203 and the reflective polarizer 202, respectively, so that the human eye may double images when viewing the images, and the visual effect is greatly reduced.

Accordingly, the present invention provides an AR optical system and AR glasses, which limit the thickness T of the phase retarder 203 in the light splitting unit 2, so that human eyes do not feel the problem of double image when viewing images, and the visual experience is improved.

In order to solve the problem of double images of the conventional AR optical system, the thickness of the phase retarder 203 is limited in the invention, and as shown in FIG. 3, the thickness of the phase retarder is T less than or equal to 18um.

In the technical scheme of the invention, after the thickness T of the phase delay element is limited to be less than or equal to 18um, as shown in fig. 4, double images formed by respectively reflecting the incident surface of the phase delay element 203 and the reflecting surface of the reflective polarization element 202 of the light beam can not be perceived by human eyes, so that the visual experience is improved.

On the other hand, when the thickness T of the phase retarder 203 is limited, it is preferable that the thickness T of the phase retarder satisfies: t is less than or equal to 10um, and under the condition, a good visual experience effect can be obtained, as shown in figure 5.

Further, as shown in fig. 3, the light splitting unit 2 further includes a glue layer 204 disposed between the phase retarder 203 and the reflective polarizer 202 for bonding the phase retarder 203 and the reflective polarizer 202, and a thickness d of the glue layer satisfies: d <20um. When the retarder 203 is a liquid crystal retarder, the liquid crystal retarder may be attached to the reflective polarizer 202 by coating.

The AR optical system 100 further includes a lens disposed on the light exit side of the light emitting module 1, and the image displayed by the light emitting module 1 is magnified by the lens, so that the image can be conveniently viewed by human eyes.

The transflective unit 3 of the AR optical system may be a curved mirror, and the curved mirror may further reflect the light reflected by the light splitting unit 2. The curved surface type of the curved mirror is not limited, and the curved mirror can be a spherical surface or an aspheric surface; the material of the curved mirror is not limited, and may be glass or plastic, and will not be described in detail herein.

Referring to fig. 1 again, when a part of the image light and a part of the ambient light enter into human eyes, interference light (external stray light) is also emitted upward from the lower side of the light splitting unit 2, and a part of the interference light reaches human eyes through reflection of the light splitting unit 2. That is, when the user views the image light and the external environment light, the user can also view the interference light incident from the outside at the same time, thereby reducing the viewing experience of the user.

In order to solve the problem, in the AR optical system of the present invention, as shown in fig. 1, the light splitting unit 2 further includes an absorbing polarizer 201 disposed on a side of the reflecting polarizer 202 away from the light emitting element 1. The absorbing polarizer may be, for example, a POL film, which helps to eliminate stray light from the bottom, thereby reducing interference of external light, or other film materials having a polarization absorbing function for light, and are not described in detail herein.

It should be noted that the light emitting assembly 2 of the present invention further includes a substrate, which is disposed on a side of the reflective polarizer 202 away from the light emitting assembly 1 and is used for carrying the absorbing polarizer 201, the reflective polarizer 202 and the phase retarder 203. The material of the substrate is not limited in the present invention, and may be a hard transparent material such as glass or plastic, which is not described herein again.

It should be noted that the included angles are determined according to actual conditions, such as the thickness of the substrate, the distance between the light splitting unit 2 and the light emitting assembly 1, and will not be described in detail herein.

The present invention further provides an AR glasses, including the above AR optical system 100, which includes all technical features of the above AR optical system, and therefore, the AR glasses also have technical effects brought by all the technical features, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims

1. An AR optical system, comprising: the device comprises a light-emitting component, a light splitting unit and a transflective unit; the light splitting unit is positioned on an emergent light path of the light emitting component, and the transflective unit is positioned on the emergent light path of the light splitting unit;

the light splitting unit includes: the phase delay element and the reflection polarization element are sequentially arranged along the optical path; the phase delay part is arranged close to the light-emitting component; the thickness T of the phase delay piece is less than or equal to 18um.

2. The AR optical system of claim 1, wherein the phase retarder has a thickness T ≦ 10um.

3. The AR optical system of claim 1, wherein the light splitting unit further comprises: a glue layer disposed between the phase retarder and the reflective polarizer for bonding the phase retarder to the reflective polarizer, wherein a thickness d of the glue layer satisfies: d <20um.

4. The AR optical system of any of claims 1 to 3, the light splitting unit further comprising: and the absorption polarization piece is arranged on one side of the reflection polarization piece far away from the light-emitting component.

5. The AR optical system of any of claims 1 to 3, wherein the phase retarder comprises: a liquid crystal phase retarder.

6. AR glasses comprising the AR optical system of any of claims 1 to 5.