CN110161687A - AR display device and wearable AR equipment - Google Patents

Abstract

The invention provides an AR display device and a wearable AR device, which belong to the field of augmented reality imaging technology. The AR display device of the present invention adopts a delay polarization beam splitter, and the delay polarization beam splitter includes a delay wave plate, a polarizing film and a polarization beam splitting film arranged in sequence; the delay wave plate is located on the side away from the image projection device, and is used to change the polarized light polarization state; the polarizing film is used to pass the polarized light whose polarization state is the first direction, and absorb the polarized light whose polarization state is the second direction; The polarized light in the first direction reflects the polarized light in the second direction. After the external interference light passes through the delay polarization beam splitter, basically no interference light is reflected into the human eye, which can remove the interference light, improve the contrast between image light and ambient light, and reduce interference.

Description

AR display devices and wearable AR devices

technical field

The present invention relates to the technical field of augmented reality imaging, in particular to an AR display device and a wearable AR device.

Background technique

AR (Augmented Reality, Augmented Reality) is also known as mixed reality. Its principle is to apply virtual information to the real world through computer technology. The real environment and virtual objects are superimposed on the same picture or space in real time.

Currently, people can interact with the real world through wearable devices, such as AR glasses or AR helmets. Figure 1 shows a schematic structural view of an AR display device in an existing AR glasses or an AR helmet. As shown in Figure 1, the optical system of an existing AR display device includes an image source 11, a beam splitter 3, and a curved half mirror. 4 and the lens 12 located above the beam splitter 3, the image source 11 is arranged on the upper part of the optical system, and there is a certain distance between the image source 11 and the lens 12, and the image light of the image source 11 enters the lens 12 from above to below. At the same time, the ambient light is incident from the right side to the left side of the curved half-reflector 4 (direction of human eyes), and the interfering light is also incident upward from the bottom of the beam splitter. Part of the image light is reflected by the beam splitter 3 and directed toward the curved half-reflector 4 , and part of the light is then reflected by the curved half-mirror 4 and directed toward the beam splitter 3 . At the same time, part of the ambient light passes through the curved half-mirror 4 and the beam splitter 3 to reach the human eye; part of the interfering light is reflected by the beam splitter 3 and reaches the human eye. Part of the image light, part of the ambient light and part of the interference light finally arrive at the human eye at the same time, so that the user can not only see the real environment outside, but also see the image of the image source 11 superimposed in the real environment.

Existing AR devices have the following defects: Due to the use of ordinary beam splitters in existing AR devices, a large amount of interfering light enters the human eye, and external interfering light seriously interferes with the contrast of the image source image, making the content of the image confusing.

Contents of the invention

Aiming at the above-mentioned problems in the prior art, the present invention provides an AR display device and a wearable AR device, which adopt a delay polarization beam splitter, which can improve image contrast and reduce interference.

In a first aspect, an embodiment of the present invention provides an AR display device, including an image projection device and a delay polarization beam splitter;

The image projection device includes an image source;

The retardation polarization beam splitter comprises a retardation wave plate, a polarizing film and a polarization beam splitting film arranged in sequence;

The delay wave plate is located on a side away from the image projection device;

The polarizing beam splitting film is located on a side adjacent to the image projection device.

In a preferred embodiment of the present invention, the delay wave plate is used to change the polarization state of polarized light;

The polarizing film is used to pass the polarized light whose polarization state is the first direction, and absorb the polarized light whose polarization state is the second direction;

The polarization splitting film is used to pass the polarized light whose polarization state is the first direction, and reflect the polarized light whose polarization state is the second direction;

The first direction and the second direction are perpendicular to each other.

In a preferred embodiment of the present invention, the retardation polarization beam splitter further includes an anti-reflection film.

In a preferred embodiment of the present invention, the anti-reflection coating is located on a side of the retardation wave plate away from the image source.

In a preferred embodiment of the present invention, the retardation polarization beam splitter further includes a substrate.

In a preferred embodiment of the present invention, the substrate is located on the side of the delay wave plate away from the image source;

Or the substrate is located between the retardation wave plate and the polarizing film;

Or the substrate is located between the polarizing film and the polarization splitting film;

The substrate is located on the side of the polarized beam splitting film close to the image source.

In a preferred embodiment of the present invention, the anti-reflection coating is located on a side of the retardation polarization beam splitter away from the image source.

In a preferred embodiment of the present invention, the anti-reflection coating is located on both sides of the retardation polarization beam splitter.

In a preferred embodiment of the present invention, the image projection device further includes matching mirrors and/or lenses.

In a preferred embodiment of the present invention, when the image projection device includes an image source, a matching mirror and a lens, one side of the matching mirror is in close contact with the image source; The lenses fit snugly.

In a preferred embodiment of the present invention, when the image projection device includes an image source and a lens, the image source and the lens are in close contact with each other.

In a preferred embodiment of the present invention, the device further includes a wave plate assembly and a curved half mirror; the delay polarizing beam splitter is arranged in sequence with the wave plate assembly and the curved half mirror to form a polarization path together components.

In a preferred embodiment of the present invention, the angle between the reflection plane of the retardation polarization beam splitter and the optical axis of the curved half mirror is α; the normal line of the image source and the delay polarization beam splitter The included angle between the reflection planes of the mirrors is β; the value range of α is between β-10° and β+10°, and 90°≥α≥0°.

In a preferred embodiment of the present invention, β is 0°-90°.

In a preferred embodiment of the present invention, β is 40°-50°.

In a preferred embodiment of the present invention, when the polarized light in the first direction and the polarized light in the second direction rotate around the direction of light propagation by 0° to 360° on the premise that they are perpendicular to each other, the The corresponding angles of the polarization splitting film and the wave plate assembly should also be changed.

In a preferred embodiment of the present invention, the wave plate component is a 1/4 wave plate.

In a preferred embodiment of the present invention, the 1/4 wave plate is arranged between the delay polarization beam splitter and the curved half mirror;

Or the 1/4 wave plate is attached to the inner side of the curved half mirror.

In a preferred embodiment of the present invention, the refractive index of the matching mirror is 1-2.7.

In a preferred embodiment of the present invention, the matching mirror is made of liquid material, liquid crystal, semi-solid material or solid material.

In a preferred embodiment of the present invention, when the matching mirror is made of liquid material, liquid crystal or semi-solid material, the image projection device further includes a sealing structure for sealing the matching mirror between the image source and the lens between.

In a preferred embodiment of the present invention, when the matching mirror is made of solid material, the image source, matching mirror and the lens are directly connected to each other.

In a preferred embodiment of the present invention, the image source is an integrated light source or a single image source.

In a second aspect, an embodiment of the present invention further provides a wearable AR device, including a clip and the above-mentioned AR display device.

Embodiments of the present invention bring the following beneficial effects:

The AR display device and the wearable AR device provided by the embodiments of the present invention are equipped with a retardation polarization beamsplitter. The delay polarization beamsplitter includes a retardation wave plate, a polarizing film, and a polarization beamsplitting film arranged in sequence, which can remove interfering light and improve image light and Ambient light contrast reduces distractions.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a schematic structural diagram of an AR display device in the prior art;

FIG. 2 is a schematic structural diagram of the AR display device provided by the first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the image projection device provided by the first embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a delay polarization beam splitter provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an AR display device provided by a second embodiment of the present invention.

icon:

1-image projection device; 11-image source; 12-lens; 13-matching mirror; 3-beam splitter; 4-curved half mirror; 5-delay polarization beam splitter; 51-substrate; 53-Polarizing film; 54-Polarizing beam splitting film; 6-Wave plate assembly.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Aiming at the problem that the existing AR display device is easy to affect the image contrast due to the entering of interfering light, an embodiment of the present invention provides an AR display device and a wearable AR device. The AR display device of the present invention will be introduced in detail below.

Embodiment one

This embodiment provides an AR display device. As shown in FIG. 2 , the AR display device includes an image projection device 1 , a delay polarization beam splitter 5 , a wave plate assembly 6 and a curved half mirror 4 . The delay polarization beam splitter 5 is arranged in sequence with the wave plate assembly 6 and the curved half mirror 4 to form a polarization optical path assembly together.

The image projection device 1 includes an image source 11 , a matching mirror 13 and a lens 12 . It should be noted that the image projection device may also only include an image source and a matching mirror. Wherein, the function of the image source 11 is to display images that need to be projected into human eyes, and the image source 11 can be a planar image source, including but not limited to an image source with integrated light sources or a single image source. For example, OLED (Organic Light-Emitting Diode, organic light-emitting diode), LCOS (Liquid Crystal On Silicon, liquid crystal on silicon), LCD (Liquid Crystal Display, liquid crystal display), MEMS (Microelectromechanical Systems, micro-electromechanical display system), DMD ( Digital Micro-mirror Device, digital micro-mirror device) and other display principle electronic devices. Among them, OLED and LCD are image sources of integrated light sources; LCOS, MEMS and DMD are single image sources, and additional auxiliary light sources are required.

The matching mirror 13 is located between the image source 11 and the lens 12 , one side of the matching mirror 13 is attached to the image source 11 , and the other side is attached to the lens 12 . The matching mirror 13 has high light transmittance and a certain refractive index, and the refractive index of the matching mirror 13 is greater than that of air. The matching mirror 13 can be made of transparent liquid material, such as water, alcohol, etc.; it can also be made of transparent solid material, such as glass, resin, etc.; it can also be made of liquid crystal or semi-solid material.

When the material of the matching mirror 13 is liquid, an external sealing structure is provided between the lens 12 and the image source 11, for example, an airtight frame, so that an airtight cavity is formed between the lens 12 and the image source 11 to prevent the material loss of the matching mirror. When the material of the matching mirror 13 is solid, the matching mirror 13 can be directly connected between the image source 11 and the lens 12 without a frame. That is, the image source 11 and the matching mirror 13 are directly connected or bonded by glue, and the matching mirror 13 and the lens 12 are directly connected or bonded by glue.

The lens 12 may be a lens or a lens group composed of multiple lenses. Each lens in the lens or lens group can be a convex lens, a concave lens, or any combination of a convex lens and a concave lens.

As shown in Figure 1, because there is a gap between the image source and the lens of the existing AR display device and the gap is too large, on the one hand, the size of the AR display device will be too large, and the distribution of the components will be scattered, resulting in the structure of the optical system. The size is too large, difficult to adjust and easy to damage. On the other hand, since the image source is in the air and the refractive index is low, it is difficult to increase the numerical aperture, the limit resolution of the system is limited, and the design is difficult. Moreover, due to the large difference in refractive index at the interface between the air and the lens, the reflectivity of this surface is relatively high, and it is easy to cause stray light such as ghost images to the subsequent system. Ghost image refers to the additional image generated near the focal plane of the optical system due to the reflection of the lens surface. The additional image is generally darker in brightness and staggered from the original image.

Compared with the above-mentioned prior art, as shown in Figure 3, the image light emitted by the image source of this embodiment first enters the matching mirror, because the material of the matching mirror has high light transmittance and a certain refractive index, compared with the air medium , reducing the refractive index difference at the interface when light enters the lens, improving the transmittance of the upper surface of the lens, increasing the light efficiency, and suppressing the generation of stray light and ghost images at the same time. Furthermore, the refractive index of air is 1, and the refractive index of the matching mirror material can be between 1 and 2.7, according to the calculation formula of R=(0.61*λ)/(n*sinθ) (R is the radius of the diffraction spot, λ is Light wavelength, n is the refractive index of the image plane, θ is the incident aperture angle), increasing the refractive index of the medium can provide a smaller diffraction spot and improve the imaging resolution. By increasing the refractive index of the image square, a relatively small aperture angle is used to achieve a large numerical aperture, which reduces the deflection angle of marginal light and reduces the difficulty of design.

The polarization optical path assembly includes a delay polarization beam splitter 5 , a wave plate assembly 6 and a curved half mirror 4 arranged in sequence in the horizontal direction. The delay polarization beam splitter 5 is located below or above the image projection device 1 .

As shown in FIG. 4 , the retardation polarization beam splitter 5 includes a substrate 51 , a retardation wave plate 52 , a polarizing film 53 and a polarization beam splitting film 54 arranged in sequence. The delay wave plate 52 is used to change the polarization state of the polarized light. The polarizing film 53 is used to pass the polarized light whose polarization state is in the first direction, and absorb the polarized light whose polarization state is in the second direction. The polarization splitting film 54 is used to pass the polarized light whose polarization state is in the first direction, and reflect the polarized light whose polarization state is in the second direction. The retardation polarization beam splitter 5 is arranged obliquely, and the polarization beam splitter film 54 is located on a side adjacent to the image projection device 1 and the wave plate assembly 6 .

Wherein, the first direction and the second direction are perpendicular to each other. For example, the polarized light in the first direction may be the polarized light whose polarization state is in the P direction, and the polarized light in the second direction may be the polarized light whose polarization state is in the S direction. Considering that P-polarized light and S-polarized light can rotate around the direction of light propagation under the premise that they are perpendicular to each other, the polarized light in the first direction can also be polarized light whose polarization state is at a certain angle to the P direction, and the polarized light in the second direction It may also be polarized light whose polarization state forms a certain angle with the S direction, which is not limited in this embodiment of the present invention.

The delay wave plate 52 can be a 1/4 wave plate. When the external interference light, or stray light, passes through the polarization splitting film and the polarizing film, the polarized light in the second direction is absorbed by the polarizing film, and the polarized light in the first direction passes through the 1/4 wave plate, is reflected by the substrate, and then again After passing through the 1/4 wave plate, its polarization direction changes by 90° to form polarized light in the second direction, which is absorbed by the polarizing film when it passes through the polarizing film. Therefore, stray light can no longer enter the optical path, thus preventing stray light from passing through polarization splitting Film and polarizing film, directly reflected by the substrate, will re-enter the optical path to form a ghost image, and the cost is low, the effect is obvious, it can effectively improve the image contrast, so that the picture is not disturbed by the ghost image, and the image quality is improved.

In actual production, the arrangement order of the substrate, retardation wave plate, polarizing film and polarization beam splitting film along the thickness direction can be as shown in Figure 4, followed by the substrate, retardation wave plate, polarizing film and polarization beam splitting film, That is, the substrate is located outside the retardation wave plate; it can also be a retardation wave plate, a substrate, a polarizing film and a polarization splitting film, that is, the substrate is located between the retardation wave plate and the polarizing film; it can also be a retardation wave plate, a polarizing film, A substrate and a polarizing beam-splitting film, that is, the substrate is located between the polarizing film and the polarizing beam-splitting film; or a retardation wave plate, a polarizing film, a polarizing beam-splitting film and a substrate, that is, the substrate is located outside the polarizing beam-splitting film.

Optionally, the retardation polarization beam splitter 5 may not include a substrate, but only include a retardation wave plate, a polarizing film and a polarization beam splitting film. The polarization splitting film is located on a side close to the image projection device and the wave plate assembly, and the delay wave plate is located on a side away from the image projection device and the wave plate assembly. When there is no substrate, the delay polarization beam splitter can still remove the interference light and improve the contrast between the image light and the ambient light.

As shown in Figure 2, the reflection plane of retardation polarization beam splitter 5 and the optical axis of curved surface half mirror 4 are α angle, and the included angle between the normal line of described image source and the reflection plane of described delay polarization beam splitter is β; α ranges from β-10° to β+10°, and 90°≥α≥0°. β is between 0°-90°, preferably 40°-50°, at this time, the field of view of the image light is the largest, and the visible range of the image light is the largest.

The wave plate assembly 6 can use a 1/4 wave plate. The 1/4 wave plate is used to convert the incident second polarized light into circularly polarized light. The 1/4 wave plate can be a plane structure or a curved surface structure; the 1/4 wave plate can also be a cylindrical structure; the 1/4 wave plate can also be a spherical or aspheric structure. The 1/4 wave plate can be arranged between the delay polarization beam splitter 5 and the curved half mirror 4, as shown in FIG. 2 .

The working principle of the AR display device provided by the embodiment of the present invention is as follows: the image light emitted from the lens 12 enters the retardation polarization beam splitter 5, and the image light first touches the polarization beam splitter film 54, and the polarization direction of the image light is the first The polarized light in two directions will be reflected to the wave plate assembly 6 . The polarized light whose polarization direction is the second direction passes through the wave plate assembly 6 and is transformed into circularly polarized light, and then part of it is emitted to the outside through the curved half mirror 4 , and the other part is reflected by the curved half mirror 4 . The reflected image light is changed from circularly polarized light to first polarized light through a 1/4 wave plate, that is, polarized light whose polarization state is the first direction. The converted first polarized light is incident on the polarizing beam splitter 5 again. Since the polarization direction is the first direction, the light will pass through the polarizing beam splitting film, polarizing film, retardation wave plate and substrate to enter the human eye at this time, so that the user can See virtual images with wide viewing angles.

When the ambient light is incident on the curved half mirror 4, a part of the ambient light passes through the curved half mirror 4, the wave plate assembly 6 and the delay polarization beam splitter 5, and enters the human eye, so that the user can see the real external environment through the virtual image. The superimposed display with the real environment achieves the effect of augmented reality.

The polarized light in the first direction and the polarized light in the second direction can be rotated by 0° to 360° around the direction of light propagation on the premise that they are perpendicular to each other. At this time, the polarization splitting film and the 1/4 wave plate should also change the corresponding angle. Therefore, during production, the installation angles of the retardation polarization beam splitter and the wave plate assembly can be determined according to the angles of the polarized light in the first direction and the polarized light in the second direction.

Considering that the theoretical energy efficiency of the image light of the prior art AR device is only about 12.5%, the brightness of the image light is severely limited; and the volume of the system is limited, it is difficult to improve the imaging quality and optical performance by increasing the number of lenses. Compared with the prior art, the embodiment of the present invention adopts the polarized optical path assembly to increase the utilization rate of light energy by more than 1 times, and the energy efficiency of the image light can be increased to about 25%, which improves the brightness of the image light, saves power consumption, and reduces the calorific value of the system .

To sum up, the AR display device provided by this embodiment has the following advantages:

First, there is no gap between the image source and the lens, making the optical system more compact, smaller, lighter, and comfortable to wear;

Second, by increasing the refractive index of the image square, a relatively small aperture angle is used to achieve a large numerical aperture, which reduces the deflection angle of the marginal light and reduces the difficulty of design;

Third, the refractive index difference at the interface of the lens is reduced, the transmittance of marginal light is improved, ghost images are reduced, and brightness is enhanced;

Fourth, the components are compactly arranged, easy to install and adjust, and the system has high strength;

Fifth, the delayed polarization beam splitter removes the interfering light and improves the contrast between the image light and the ambient light;

Sixth, the energy efficiency of image light is improved to about 25%, and the brightness is significantly improved;

Seventh, the ghost image caused by stray light is removed, the cost is low, the effect is obvious, and the light contrast of the image is improved. The picture is not disturbed by ghost images, and the image quality is improved;

Eighth, in the case of the same image light brightness requirements, the AR display device can save energy consumption and reduce equipment heat generation.

Embodiment two

This embodiment provides an AR display device. As shown in FIG. 5 , the AR display device includes an image projection device 1 and a polarization optical path assembly.

The difference from the first embodiment above is that the image projection device 1 of this embodiment includes an image source 11 and a lens 12 . The image source 11 is closely attached to the lens 12 .

Since the image source 11 is closely attached to the lens 12, the image light emitted by the image source 11 will directly enter the lens 12, which reduces the refractive index difference at the interface when the light enters the lens, improves the transmittance of the upper surface of the lens, and increases the Light efficiency can also suppress the generation of stray light and ghost images.

In the AR display device provided in this embodiment, the image source and the lens are tightly bonded, making the optical system more compact in structure, smaller in size, lighter in weight, and comfortable to wear.

In order to save space, the content of the second embodiment is the same as that of the first embodiment, which can be referred to the first embodiment above, and will not be repeated here.

Embodiment three

An embodiment of the present invention also provides a wearable AR device, including a clamp and the AR display device described in the first or second embodiment above.

The wearable AR device may be but not limited to AR glasses, AR helmet or AR mask. When the wearable AR device is AR glasses, the clip is a frame, and the AR display device is installed on the frame, which is equivalent to the positions of two lenses. When the wearable AR device is an AR helmet, the clamp member may be a helmet shell, and the AR display device is installed on the front window of the helmet shell.

The wearable AR device of this embodiment is provided with the above-mentioned AR display device, and the AR display device adopts a polarized optical path assembly, which includes a delay polarization beam splitter, a wave plate assembly, and a curved half mirror arranged in sequence, and the image projection device is located at the delay above or below the polarizing beamsplitter.

The wearable AR device uses a delayed polarization beam splitter. When external interference light passes through the delay polarization beam splitter, basically no interference light is reflected into the human eye, thereby improving image contrast and reducing interference. The image light emitted from the image projection device is projected onto the delayed polarization beam splitter, the light in the polarization state of the image light is in the first direction and enters the external environment through the delay polarization beam splitter, and part of the polarization state in the image light is the light in the second direction It is reflected on the wave plate component; through the wave plate component, it is converted into circularly polarized light, incident to the curved half mirror, part of the light is emitted to the outside world, and the other part is reflected by the curved surface half mirror and then passes through the wave plate component, and the circularly polarized light The light transformed into the first direction of polarization enters the human eye through the delayed polarization beam splitter, enabling the user to see a virtual image with a large viewing angle, which improves the utilization rate of light energy and the brightness of the image light. In the case of the same image light brightness requirements, the AR display device can save energy consumption and reduce equipment heat generation.

At the same time, it also has the following advantages: by increasing the refractive index of the image square, a relatively small aperture angle is used to achieve a large numerical aperture, which reduces the deflection angle of marginal rays and reduces the difficulty of design; reduces the refractive index difference at the lens interface , improve the transmittance of edge light, reduce ghost images, and enhance brightness; the components are arranged compactly, easy to install and adjust, the system has high strength, lighter weight, and is comfortable to wear; the energy efficiency of image light is improved to about 25%, and the brightness is significantly improved ;Remove the ghost image caused by stray light, the cost is low, the effect is obvious, and the light contrast of the image is improved. The picture is not disturbed by ghost images, and the image quality is improved; in the case of the same image light brightness requirements, the AR display device can save energy consumption and reduce equipment heat generation.

The AR display device and the wearable AR device provided by the embodiments of the present invention have the same technical features, so they can also solve the same technical problems and achieve the same technical effects.

It should be noted that, in the description of the embodiments of the present invention, unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a A detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, and it may be an internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-described embodiments are only specific implementations of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting them, and the scope of protection of the present invention is not limited thereto, although referring to the foregoing The embodiment has described the present invention in detail, and those skilled in the art should understand that any person familiar with the technical field can still modify the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention Changes can be easily thought of, or equivalent replacements are made to some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of the present invention within the scope of protection. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (24)

1. a kind of AR display device, which is characterized in that including image projection apparatus and delay polarization spectroscope；

Described image grenade instrumentation includes image source；

The delay polarization spectroscope includes delay wave plate, light polarizing film and the polarization beam splitter being arranged successively；

The delay wave plate is located remotely from the side of described image grenade instrumentation；

The polarization beam splitter is located at the side for closing on described image grenade instrumentation.

2. AR display device according to claim 1, which is characterized in that the delay wave plate is for changing the inclined of polarised light Vibration state；

The light polarizing film is used for the polarised light by polarization state for first direction, absorbs the polarised light that polarization state is second direction；

The polarization beam splitter is used for the polarised light by polarization state for first direction, and reflected polarization state is the polarization of second direction Light；

The first direction and the second direction are mutually perpendicular to.

3. AR display device according to claim 1, which is characterized in that the delay polarization spectroscope further includes anti-reflection Film.

4. AR display device according to claim 3, which is characterized in that it is separate that the anti-reflection film is located at the delay wave plate The side of the image source.

5. AR display device according to claim 1, which is characterized in that the delay polarization spectroscope further includes substrate.

6. AR display device according to claim 5, which is characterized in that the substrate is located at the delay wave plate far from institute State the side of image source；

Or the substrate is between the delay wave plate and the light polarizing film；

Or the substrate is between the light polarizing film and the polarization beam splitter；

The substrate is located at the polarization beam splitter close to the side of the image source.

7. AR display device according to claim 2, which is characterized in that the anti-reflection film is located at the delay polarization spectro Side of the mirror far from the image source.

8. AR display device according to claim 2, which is characterized in that the anti-reflection film is located at the delay polarization spectro The two sides of mirror.

9. AR display device according to claim 1, which is characterized in that described image grenade instrumentation further includes matching mirror And/or lens.

10. AR display device according to claim 9, which is characterized in that when described image grenade instrumentation include image source, With mirror and when lens, fitted closely between the side and the image source of the matching mirror；The other side is fitted closely with the lens.

11. AR display device according to claim 9, which is characterized in that when described image grenade instrumentation include image source and When lens, fitted closely between the image source and the lens.

12. AR display device according to claim 1, which is characterized in that described device further includes wave plate component and curved surface Half-reflecting mirror；The delay polarization spectroscope is arranged successively with the wave plate component and the curved surface half-reflecting mirror, is collectively constituted Polarize optical path component.

13. AR display device according to claim 12, which is characterized in that the plane of reflection of the delay polarization spectroscope Angle between the optical axis of the curved surface half-reflecting mirror is α；The normal of the image source and it is described delay polarization spectroscope it is anti- The angle penetrated between plane is β；α value range is and 90 ° >=α >=0 ° between β -10 ° to+10 ° of β.

14. AR display device according to claim 13, which is characterized in that β is 0 °~90 °.

15. AR display device according to claim 13, which is characterized in that β is 40 °~50 °.

16. AR display device according to claim 12, which is characterized in that when the polarised light of the first direction and described The polarised light of second direction meet be mutually perpendicular under the premise of around light propagate 0 °~360 ° rotations in direction when, the polarization Spectro-film and the wave plate component will also change corresponding angle.

17. AR display device according to claim 12, which is characterized in that the wave plate component is quarter wave plate.

18. AR display device according to claim 17, which is characterized in that it is inclined that the quarter wave plate is set to the delay It shakes between spectroscope and the curved surface half-reflecting mirror；

Or the quarter wave plate fits in the inside of the curved surface half-reflecting mirror.

19. AR display device according to claim 10, which is characterized in that the refractive index of the matching mirror is 1~2.7.

20. AR display device according to claim 19, which is characterized in that the matching mirror is by liquid material, liquid crystal, half Solid-state material or solid material are constituted.

21. AR display device according to claim 20, which is characterized in that when the matching mirror is liquid material, liquid crystal Or when semisolid material, described image grenade instrumentation further includes sealing structure, and the matching mirror is sealed in the image source and institute It states between lens.

22. AR display device according to claim 20, which is characterized in that when the matching mirror is solid material, institute Image source, matching mirror and the lens are stated to be connected directly to one another.

23. AR display device according to claim 1, which is characterized in that the image source is the image source or list of integrated optical source One image source.

24. a kind of wearable AR equipment, which is characterized in that including described in any one of clamping piece and the claims 1~23 AR display device.