CN115826109B

CN115826109B - Lens and near-to-eye display device

Info

Publication number: CN115826109B
Application number: CN202310130212.0A
Authority: CN
Inventors: 陈志东
Original assignee: Shenzhen Pencil Vision Technology Co ltd
Current assignee: Shenzhen Pencil Vision Technology Co ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-06-06
Anticipated expiration: 2043-02-17
Also published as: CN115826109A

Abstract

Embodiments of the present application provide a lens and a near-eye display device, wherein the lens includes: the first surface comprises a first imaging area and at least one second imaging area, the first imaging area and the second imaging area are mixed and distributed on the first surface, the first imaging area and the second imaging area are suitable for complete imaging respectively, and the imaging of the first imaging area is different from the imaging of the second imaging area.

Description

Lens and near-to-eye display device

Technical Field

The embodiment of the application relates to the field of optical display, in particular to a lens and a near-eye display device.

Background

The lens includes a spherical lens having a constant radius of curvature and an aspherical lens having a radius of curvature that varies with the central axis. The aspherical lens can eliminate the defects of spherical lenses such as aberration at the edge of the lens by changing the radius of curvature along with the central axis, thereby improving the optical effect, and can be applied to various optical fields such as: near-eye display field. The near-eye display field refers to a technical field in which an image of an image source near the human eye is presented in a viewable range of the human eye.

However, the characteristics of the existing lens, whether it is a spherical lens or an aspherical lens, that maintains a constant radius of curvature or a radius of curvature that varies with the central axis limit the display effect that can be achieved by the lens in the optical field, especially in the near-eye display field, which makes the display effect of the near-eye display device poor. Therefore, how to provide a lens, which provides a basis for improving the display effect of the lens in the optical field, is a technical problem to be solved in the art.

Disclosure of Invention

In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:

in a first aspect, embodiments of the present application provide a lens, comprising: the first surface comprises a first imaging area and at least one second imaging area, the first imaging area and the second imaging area are mixed and distributed on the first surface, the first imaging area and the second imaging area are suitable for complete imaging respectively, and the imaging of the first imaging area is different from the imaging of the second imaging area.

In a second aspect, embodiments of the present application further provide a near-eye display device, including: the lens of the first aspect.

Thus, the lens provided by the embodiment of the application comprises: the first surface comprises a first imaging area and at least one second imaging area, the first imaging area and the second imaging area are mixed and distributed on the first surface, the first imaging area and the second imaging area are suitable for complete imaging respectively, and the imaging of the first imaging area is different from the imaging of the second imaging area. Therefore, the lens provided by the embodiment of the application comprises the first imaging area and the second imaging area which are mixed and distributed on the first surface for complete imaging, and can be respectively imaged into different images to realize more complex optical functions, so that a foundation is provided for improving the application effect of the lens in various optical fields.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic view of an imaging;

FIG. 2 is another imaging schematic;

FIG. 3 is a schematic view of a first surface of a lens with different optical functions according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a cross-sectional structure and a front surface of a lens according to an embodiment of the present disclosure;

FIG. 5 is another schematic view of the front side of a lens according to an embodiment of the present disclosure;

FIG. 6 is a schematic view of a lens according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram illustrating a cross-sectional structure of a near-to-eye display device according to an embodiment of the present disclosure;

FIG. 8 is another schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the disclosure;

FIG. 9 is a schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the disclosure;

FIG. 10 is a schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the disclosure;

FIG. 11 is a schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the disclosure;

fig. 12 is a schematic view of a cross-sectional structure of a near-eye display device according to an embodiment of the disclosure.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

As described in the background, existing lenses limit the display effect that can be achieved in various optical fields. Therefore, to provide a basis for improving the display effect of the lens in various optical fields, the embodiments of the present application provide a lens, including: the first surface comprises a first imaging area and at least one second imaging area, the first imaging area and the second imaging area are mixed and distributed on the first surface, the first imaging area and the second imaging area are suitable for complete imaging respectively, and the imaging of the first imaging area is different from the imaging of the second imaging area.

As can be seen, in the lens provided in the embodiment of the present application, there are at least two different imaging areas such as the first imaging area and the second imaging area on the same surface, the imaging areas refer to the area of the first surface that can be imaged independently and completely, for convenience in understanding the imaging areas, please refer to fig. 1 and 2, and fig. 1 is an imaging schematic diagram; fig. 2 is another imaging schematic.

As shown in fig. 1, a street lamp C, a lens D and a human eye E are provided, wherein the lens is a reflecting mirror, and the street lamp C cannot image on the human eye through the lens D. The lens D is provided with a transparent D1 unit, and the D1 unit can transmit light, so that a part C1 of the street lamp C can be imaged on the human eye E through the D1 unit due to the distance between the human eye E and the lens D and the distance between the lens D and the street lamp C, and the light of the rest part (such as a lamp of the street lamp) can not be received by the human eye E although passing through the D1 unit, so that imaging cannot be performed.

As shown in fig. 2, in order to see other parts of the street lamp C (e.g., see the lamp of the street lamp), a D2 unit may be newly provided at the lens D, so that the C2 part of the street lamp may be imaged on the human eye E through the D2 unit. It should be noted that, in the figure, when only the D1 unit and the D2 unit are provided, the C3 portion between the C1 portion and the C2 portion still cannot be imaged on the human eye, so that the image of the street lamp C perceived by the human is incomplete and not completely imaged.

Factors that influence whether or not the image is complete include the size of the cells, the spacing between the cells, the number of cells, and the like. By reasonably arranging the cell size, spacing between cells, number of cells (e.g., cells comprising D1 through Dn-1), shape, etc. in the lens D, the complete street lamp C can be imaged on the human eye E through D1 cells through Dn-1.

In the above example, D1 to Dn-1 each function to image a portion of the street lamp C as the human eye E, and all the D1 to Dn-1 units together image the complete image. Thus, all of the D1 to Dn-1 units together form an imaging region.

As can be seen from the above description of fig. 1 and 2, a complete image means that all parts of the image can be completely spliced into a whole, and there is no non-imaged part that cannot be spliced. It should be noted that complete imaging does not mean that all parts of an object must be imaged when the object is imaged, but that the imaged parts must be completely mosaicable, and still taking fig. 2 as an example, when there is an unimaged C3 part between imaged C1 and C2 parts, so that the C1 and C2 parts cannot be stitched into a complete image, i.e., incomplete imaging; in contrast, it is assumed that a D3 region (not shown) is disposed between the D1 unit and the D2 unit, so that the C3 portion can be imaged on the human eye E through the D3 region, since the C1 portion, the C2 portion, and the C3 portion can be spliced into a complete image, no scene of the street lamp portion under C1 and the non-street lamp above C2 is imaged on the human eye for the purpose of completing the imaging.

In the lens provided by the embodiment of the application, the first imaging area and the second imaging area are mixed and arranged on the first surface, and the mixed arrangement is to enable the first imaging area and the second imaging area to be respectively and completely imaged. In some embodiments, the first imaging region may be formed by imaging units at a distance, where the imaging units refer to the basic units (e.g., the D1 unit and the D2 unit shown in fig. 2) that make up the first imaging region or the second imaging region, and the portions between the regions of the first imaging region are filled by the second imaging region (e.g., the lens region between the D1 unit and the D2 unit in fig. 2); alternatively, the second imaging region is constituted by imaging units at a distance from each other, and a portion between the regions of the second imaging region is filled by the first imaging region; in other embodiments, the first imaging region and the second imaging region may be the same vortex, for example, reference may be made to two mosquito coils that are each vortex and intertwined.

By "imaging of the first imaging region is different from imaging of the second imaging region" is meant that the curvatures of the first imaging region and the second imaging region are not exactly the same, nor are they combined into one complete aspherical lens whose curvature varies with the central axis. Wherein the curvature of the first imaging region and the curvature of the second imaging region are identical, including both the same curvature and the same curvature variation and spatial distribution. The first imaging region and the second imaging region may both be imaged in real or in dashed lines on the basis that the curvatures are not exactly the same; of course, one may be imaged as a real image and the other as a virtual image.

Therefore, the lens provided by the embodiment of the application comprises the first imaging area and the second imaging area which are mixed and distributed on the first surface for complete imaging, and can be respectively imaged into different images to realize more complex optical functions, so that a foundation is provided for improving the application effect of the lens in various optical fields.

In a specific embodiment, please refer to fig. 3, fig. 3 is a schematic diagram of a first surface of a lens with different optical functions according to an embodiment of the present application.

In order to facilitate distinguishing the first imaging region R1 from the second imaging region R2, the first imaging region R1 is represented as a dark color and the second imaging region R2 is represented as a light color in the embodiment of the present application. The first surface S1 may be any one of the faces of the lens.

As shown, the first imaging region R1 in the lens can function optically as transmitted light and the second imaging region R2 can function optically as reflected light. In this way, different optical functions are further set on the basis of the independent imaging of the first imaging region R1 and the second imaging region R2, which can provide a basis for improving the display effect of the lens in various optical fields. In the near-to-eye display field, natural light in nature can be transmitted through the first imaging region R1 to form a real image in nature, and light of an image source is reflected through the second imaging region R2 to act on human eyes, so that the human eyes present virtual images with proper distances, and the human eyes can observe the image in nature and the image of the image source at the same time, and virtual-real combination is better performed; in addition, by enabling a person to observe the natural world while observing the image of the image source, the danger occurring in the natural world is noticed, thereby improving the safety of the user at the time of near-eye display.

In a specific embodiment, the diopter of the first imaging region R1 may be 0, and is adapted to transmit light toward the first surface. Thus, when light is transmitted from the first surface S1 through the first imaging region R1, the light is not refracted, resulting in deformation of the human eye imaging; in another embodiment, since many people in reality have myopia or hyperopia, in order to avoid not being able to see the imaging of distant objects through the first imaging region R1, or to avoid the need to additionally wear vision correcting glasses, the diopter of the first imaging region R1 is negative or positive, suitable for diverging or focusing the light rays directed to the first surface S1 for vision correction. In this way, the first imaging region R1 functions as a pair of glasses, so that light rays of distant objects are scattered or focused when passing through the first imaging region R1, and thus the objects can be seen clearly without wearing the glasses only by the fresnel lens provided in the present application.

In order to allow the virtual image to appear as far as possible, thereby enhancing the imaging effect of the near-eye display, in one embodiment, the second imaging region R2 has a positive refractive power and is further adapted to collimate the light directed to the first surface S1. Therefore, the light rays forming the image are collimated into parallel light, and the reverse extension lines are not intersected, so that a virtual image formed in the human eye is infinity, and the imaging effect of the near-eye display device is improved.

In order to facilitate the hybrid arrangement of the first imaging region R1 and the second imaging region R2, in one embodiment, please refer to fig. 4, fig. 4 is a schematic diagram of a cross-sectional structure and a front side of a lens according to an embodiment of the present application.

As shown, the imaging unit is an annular unit with an annular structure; on the first surface S1, the imaging units of the first imaging region R1 and the imaging units of the second imaging region R2 are interlaced. By providing the imaging units of the first imaging region R1 and the second imaging region R2 as ring units, production can be facilitated.

Since the first imaging region R1 and the second imaging region R2 have different functions, namely, a real image of natural light transmitted through the natural world and a virtual image of light reflected from the image source, the size limitation of the annular structure is different when the complete imaging is achieved, and in some embodiments, the difference between the outer diameter and the inner diameter of the annular unit of the first imaging region R1 is not greater than 100 mm; the difference between the outer diameter and the inner diameter of the annular unit of the second imaging region R2 is not less than 0.1 μm and not more than 4 mm. In this way, complete imaging of the first imaging region R1 and the second imaging region R2 can be achieved when the imaging unit is of a ring-shaped structure.

In another embodiment, at least two imaging units of the first imaging region R1 and/or at least two imaging units of the second imaging region R2 are discretely distributed on the first surface. Taking an example in which the first imaging area includes at least two imaging units as an illustration, please refer to fig. 5 specifically, fig. 5 is another schematic diagram of the front surface of the lens provided in the embodiment of the present application.

As shown, in order for the discrete elements of the first imaging region R1 and the second imaging region R2 to not cause brightness differences while fully imaging, in some embodiments, the imaging elements are non-overlapping and void-free tiled, closely-spaced graphic structures having a shape comprising at least one of rectangular, regular hexagonal, and regular octagonal.

The reason for the brightness difference is that the same portion of the imaged object is imaged by a plurality of imaging units, and the plurality of imaging units transmit light of the portion to human eyes at the same time, so that the light imaged by the portion is more than that imaged by other portions, thereby causing the image brightness of the portion to be higher. By setting the imaging units as a closely-spaced pattern, each part of the imaged object can be imaged by only one imaging unit, so that the resultant virtual image or real image can be reduced to have a luminance difference.

For ease of production, in some embodiments, the imaging unit is a circular structure. In this way, the production of the lens can be facilitated.

It should be noted that, since the imaging unit is not a dense pattern, the imaging unit may have a circular structure, and in order to reduce the brightness difference while facilitating the production, in some embodiments, the imaging unit of the circular structure may be densely distributed on the first surface, where the dense distribution includes at least one of a rectangular distribution, a regular hexagonal distribution, and a regular octagonal distribution. In this way, the brightness difference of the real or virtual image formed can be reduced while facilitating production.

In order to prevent too many imaging units from affecting imaging of the second imaging region R2 while the first imaging region R1 is fully imaged, in some embodiments, the center-to-center spacing of at least two imaging units of the first imaging region R1 is not less than 0.1 micrometers, and not more than 8 millimeters. In this way, the imaging units of the first imaging region R1 are discretely distributed on the first surface with a center-to-center distance of not less than 0.1 μm and not more than 8 mm, so that the over-dense distribution can be prevented while complete imaging is performed, and the brightness of a virtual image formed by the second imaging region R2 is prevented from being too dark; in other embodiments, the center-to-center spacing of the imaging units of the second imaging region R2 is also not less than 0.1 micrometers and not more than 8 millimeters in order not to affect the imaging of the first imaging region R1. Further, for better complete imaging, in some embodiments, the area of a single said second imaging unit is no less than 0.03 square micrometers and no more than 50 square millimeters.

In actual product production, the lens provided by the embodiment of the application can be produced by presetting a die with a first imaging area R1 and a second imaging area R2 and then injection molding or pressing. But for ease of understanding the first surface S1 may be approximated as the blend of the surfaces of two different lenses (first and second lens). That is, a part of the position of the first lens surface is replaced with the surface of the second lens part position, constituting the first surface S1.

In order to reduce the weight of the near-eye display device and thus reduce the burden on the head and cervical vertebrae caused by wearing the near-eye display device for a long period of time, fresnel lenses for removing intermediate media are currently used in most near-eye display devices. It is noted that the removal of the intermediate medium of the lens does not affect the optical function of the lens, since light is refracted only at the surfaces of the two different refractive index mediums, and the internal medium of the lens only serves to conduct light, and therefore the optical function of the lens is mainly achieved by a curved lens surface having a certain diopter. Thus, in order to reduce the weight of the lens without damaging the optical function of the lens, the intermediate medium of the lens may be removed. The lens having a discontinuous curved surface and a continuous curvature is also called a screw lens or a fresnel lens because the front surface of the lens has a screw shape. The fresnel lens can be produced by providing a screw-shaped mold. In some embodiments, the lenses provided herein may be fresnel lenses to reduce the weight of the lenses.

In other embodiments, the lenses provided herein may be superlenses (metalens) whose first surface is a supersurface, which is a planar lens that uses the supersurface to focus light, and which is a series of artificial antennas that manipulate the optical response of incident light, including its amplitude phase and polarization.

In order to further improve the imaging quality, in an embodiment, please refer to fig. 6, fig. 6 is a schematic diagram of a lens provided in an embodiment of the present application, as shown in the fig. 6, in which the first surface S1 is tightly connected to the flat layer R3, and a difference between a refractive index of the flat layer R3 and a refractive index of the lens is smaller than a difference between a refractive index of air and a refractive index of the lens.

It should be noted that, when the lens is a fresnel lens or a superlens, the first surface S1 is in a tooth shape, and the tooth-shaped side surface F reflects and refracts incident light, so as to have a negative effect on imaging, so in order to improve imaging quality, a flat layer R3 tightly connected to the first surface S1 may be provided, and since the difference between the refractive indices of the flat layer R3 and the lens is smaller, reflection and refraction of light at the side surface F are reduced, and imaging quality is improved. Further, in a specific embodiment, the refractive index of the planarization layer R3 may be the same as that of the lens. In particular, the planar layer R3 may be a lens or other optical medium.

The embodiment of the application also provides a near-eye display device, which comprises the lens. In order to better understand the improvement of the display effect of the lens provided by the embodiment of the application on the near-eye display device, the near-eye display device including the lens is first described. Referring to fig. 7 in detail, fig. 7 is a schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the present disclosure.

As shown in the drawings, the near-eye display device provided in the embodiment of the application includes:

an image source 1 for emitting a first polarized light of a display image;

a polarizing mirror 2 adapted to reflect light of a first polarization emitted by said image source 1 and to transmit light of a second polarization, said second polarization having a first polarization state difference from said first polarization;

a phase retarder 3 adapted to retard the phase of light, converting the first polarized light passing through the phase retarder 3 even times into the second polarized light;

and the lens 4 is provided by the embodiment of the application.

The near-eye display device provided in the embodiments of the present application may specifically be an Augmented Reality (AR) display device or a virtual display (VR) display device, etc. In the embodiment of the application, the image source comprises a laser image source, an LED image source, an OLED image source or a micro-LED image source and the like.

The principle of imaging light rays emitted by the image source 1 in the near-eye display device in human eyes is as follows: the image source 1 emits first polarized light of a first polarization state of a display image to the polarization mirror 2, the first polarized light being reflected by the polarization mirror 2 to the phase retarder 3, the first polarized light passing through the phase retarder 3 being delayed by a phase to become third polarized light of a third polarization state; the third polarized light exits from the phase retarder 3 to the first surface of the lens 4 and is reflected by the second imaging zone R2 of the first surface; the third polarized light reflected by the second imaging region R2 returns to the phase retarder 3 and becomes the second polarized light of the second polarization state by retarding the phase when passing through the phase retarder 3; the second polarized light passes through the polarizing mirror 2 for human eye imaging.

The first polarization state, the second polarization state and the third polarization state are respectively different polarization states, and the difference of the polarization states can refer to the difference of polarization types such as linear polarization, elliptical polarization, circular polarization and the like, or refer to the same polarization type but different phases.

Thus, although the light rays of the image source 1 are near to eyes, the light rays can be imaged at a far distance which is comfortably focused by eyes after being reflected by the second imaging area; meanwhile, the image can be amplified through refraction, so that the human eyes can see the amplified image, and the watching effect can be improved; when the first imaging region R1 has positive diopter, the light emitted by the image source can be collimated, and the light of the image source can be imaged at infinity.

For safety and better virtual imaging in the real world, human eyes need to observe the external real world while receiving the light imaging of the image source 1, namely receiving the natural light of the nature, wherein the imaging principle of the natural light of the nature is as follows: natural light is transmitted from the first imaging region R1 of the first surface, passes through the lens 4, is filtered by the phase retarder 3, and the filtered second polarized light with the second polarization state in the natural world is transmitted to the polarized reflector 2, so as to be used for observing the outside by human eyes.

It should be noted that, the first polarized light refers to polarized light of the first polarization state, and not specifically refers to light emitted by the image source, and natural light is polarized light including each polarization state, so there is also first polarized light of the first polarization state, and the second polarized light and the third polarized light are the same.

Thus, the human eyes can see not only the virtual image formed by the second polarized light, but also the second polarized light reflected by the real object, namely the real object can be seen through the display device, so that the image combining the virtual and the real can be seen.

It should be noted that, since the first imaging region R1 and the second imaging region R2 are respectively and completely imaged, the diopter of the first imaging region R1 and the diopter of the second imaging region R2 can be respectively set, and the influence of the larger diopter on natural light is not required to be considered when the second imaging region R2 for collimating the light of the reflected image source is set, so that the first imaging region R1 with smaller diopter and the second imaging region R2 with larger diopter can be set, so that the near-eye display device is miniaturized (the larger the diopter of the second imaging region R2 is, the smaller the horizontal distance between the lens and the image source is) at the same time, and the excessive refraction of the natural light when passing through the first imaging region R1 is avoided, so that the external size and distance observed by human eyes are deformed in a zooming mode, and potential safety hazards and poor display effect are caused. In some embodiments, the diopter of the first imaging region R1 may be zero, and in other embodiments, the diopter of the first imaging region R1 may be negative or positive, as described above with reference to the lens.

In some embodiments, the phase difference between the first polarization state and the second polarization state is a 90 degree phase and the phase retarder is a 45 degree phase retarder. In this way, the polarization directions of the first polarized light and the second polarized light are perpendicular (horizontally polarized light and vertically polarized light), and the polarized mirror 2 can be maximized to reflect the first polarized light and transmit the second polarized light.

It should be noted that, although the polarizing mirror 2 may reflect the first polarized light while transmitting the second polarized light, the first polarized light in nature may be reflected to human eyes through the polarizing mirror 2, please refer to the natural light a in fig. 7, and the part of the light is incident on the near-eye side of the polarizing mirror 2, so that the first polarized light is reflected to human eyes, and the natural light a is not the natural light passing through the lens 4 and is not imaged in the first imaging region, and therefore, the imaging of the first imaging region R1 and the second imaging region R2 may be blurred, so that the display effect of the near-eye display device is reduced.

In order to prevent the natural light reflected by the polarizing mirror 2 to the human eye from blurring the image of the near-eye display device, please refer to fig. 8 and 9, fig. 8 is another schematic diagram of the cross-sectional structure of the near-eye display device according to the embodiment of the present application; fig. 9 is a schematic diagram of a cross-sectional structure of a near-eye display device according to an embodiment of the disclosure.

As shown in the drawings, the near-eye display device provided in the embodiments of the present application further includes: an anti-reflection polarizer 5 disposed between the human eye and the polarizing reflector for transmitting the second polarized light and eliminating the first polarized light directed from the near-eye side of the near-eye display device to the polarizing reflector. The anti-reflection polarizer 5 is used for absorbing light of a first polarization and transmitting light of a second polarization. In this way, the first polarized light transmitted into human eyes can be reduced, and the imaging quality of the image source can be improved.

In order that the anti-reflective polarizer 5 may intercept light of a first polarization that is transmitted into the human eye, in some embodiments, the anti-reflective polarizer 5 may be disposed on a side of the near-eye display device that is near the human eye, anywhere between the human eye and the polarizing reflector 2 (as shown in fig. 8); in other embodiments, the anti-reflective polarizer 5 may be disposed on a first side of the polarizing mirror 2, the first side being the near-eye side of the polarizing mirror in the near-eye display device (as shown in fig. 9).

It is noted that in order to reduce the weight of the near-eye display device, in some embodiments, the optical waveguide medium may not be additionally provided in the near-eye display device, as shown in fig. 7. In other embodiments, to reduce optical aberration, the near-eye display device provided in the embodiments of the present application may further include:

a first optical waveguide medium disposed between the polarizing mirror and the lens;

the second optical waveguide medium is arranged on a first side surface of the polarized reflector, and the first side surface is the near-eye side of the polarized reflector in the near-eye display device.

The first optical waveguide medium and the second optical waveguide medium may be specifically a prism (shown in fig. 8, prism 71 and prism 72) or a wedge mirror (shown in fig. 9, wedge mirror 81 and wedge mirror 82). Thus, by providing the first optical waveguide medium and the second optical waveguide medium, optical aberration can be reduced.

With continued reference to fig. 8, in some embodiments, in order to further improve the quality of the image display and reduce the optical aberration, the near-eye display device provided in the embodiments of the present application may further include a lens group 73 disposed between the image source and the first optical waveguide medium.

With continued reference to fig. 9, when the first optical waveguide medium and the second optical waveguide medium are wedge-shaped mirrors, the light incident by the image source will only exit the first optical waveguide medium and the second optical waveguide medium when a certain preset exit angle is formed between the light and the surfaces of the first optical waveguide medium (wedge-shaped mirror 81) and the second optical waveguide medium (wedge-shaped mirror 82), otherwise, the light will be refracted and propagated in the first optical waveguide medium and the second optical waveguide medium. It should be noted that, according to the law of reflection (law of reflection) of the medium surface, light will only be refracted at the surface of the medium having a refractive index change, and the refractive indices of the retarder 3 and the first optical waveguide medium may be similar, so that in some embodiments, an air gap may be provided between the first optical waveguide medium and the retarder 3, so as to prevent light having a non-preset exit angle from exiting from the first optical waveguide medium to the retarder 3 when the first optical waveguide medium is closely connected to the retarder 3.

In other embodiments, referring specifically to fig. 10, fig. 10 is a schematic diagram illustrating a cross-sectional structure of a near-eye display device according to an embodiment of the present application. The embodiment of the application may further provide an angle-sensitive reflector 6 between the first optical waveguide medium and the phase retarder 3, where the angle-sensitive reflector 6 may be configured to reflect at a preset exit angle, and transmit at other angles, and specifically may be a holographic reflector or a multilayer medium reflector. In this way, light rays with non-preset outgoing angles can be further prevented from exiting from the first optical waveguide medium by reflection due to the nature of the angle-sensitive reflector 6 itself.

In an embodiment, in order to further reduce the weight of the near-eye display device and facilitate the production of the near-eye display device, please refer to fig. 11, fig. 11 is a schematic diagram illustrating a cross-sectional structure of the near-eye display device according to an embodiment of the present application.

As shown in fig. 11, an embodiment of the present application further provides a near-eye display device, including:

an image source 1 for emitting light for displaying an image;

a half mirror 7 for transmitting part of the light and reflecting the other part of the light;

and the lens 4 is provided by the embodiment of the application.

Specifically, the half-reflecting and half-reflecting mirror 7 may be a lens with a surface coated with a film, so that 50% of light can be transmitted and 50% of light can be reflected.

The principle of imaging light rays emitted by the image source 1 in the near-eye display device in human eyes is as follows: the image source 1 emits light for displaying an image to the half mirror 7, and part of the light emitted by the image source 1 is reflected to the first surface of the lens 4 by the half mirror 7; light rays emitted to the first surface are reflected by the second imaging region R2 of the first surface and return to the half-reflecting half-mirror 7; the light returned to the half-reflecting lens partially transmits the half-reflecting lens 7 for human eye imaging; natural light is transmitted from the first imaging region R1 of the first surface to the half mirror 7; part of the natural light transmitted to the half reflecting half mirror transmits the half reflecting half mirror 7 for the human eye to observe the outside.

In this way, the phase retarder can be removed, further reducing the weight of the near-eye display device.

In order to increase the viewing angle of the display and enhance the near-eye display effect, please refer to fig. 12, fig. 12 is a further schematic diagram of a cross-sectional structure of the near-eye display device according to the embodiment of the present application. As shown in the figure, the near-eye display device provided in the embodiment of the present application has a plurality of functional symmetry units 8 (shown in a dashed box in the figure); the image source 1, the lens 4, the polarizing mirror 2, the phase retarder 3 and the anti-reflective polarizer 5 are arranged in the functionally symmetric unit; the functional symmetry units 8 are used for symmetrically splicing and expanding the visual angle. Therefore, by splicing a plurality of functional symmetrical units, the visual angle of image display is enlarged, so that human eyes can see wider image source pictures, and the effect of near-eye display is improved.

The foregoing describes a number of embodiments provided by embodiments of the present application, and the various alternatives presented by the various embodiments may be combined, cross-referenced, with each other without conflict, extending beyond what is possible, all of which may be considered embodiments disclosed and disclosed by embodiments of the present application. Although the embodiments of the present application are disclosed above, the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention shall be defined by the appended claims.

Claims

1. A near-eye display device, comprising: lenses, image sources, polarizing mirrors and phase retarders;

the lens includes: a first surface comprising a first imaging zone and at least one second imaging zone, the first imaging zone and the second imaging zone being intermixed and distributed on the first surface, the first imaging zone comprising at least two imaging units distributed on the first surface, and the second imaging zone comprising at least two imaging units distributed on the first surface, the imaging units being the basic units constituting the first imaging zone or the second imaging zone, the first imaging zone and the second imaging zone being adapted for respectively complete imaging, the complete imaging being that parts of the imaged image are integrally spliced together, the imaging of the first imaging zone and the imaging of the second imaging zone being different, the curvature of the first imaging zone and the curvature of the second imaging zone being not identical, and the partial positions of the first imaging zone surface being replaced by the partial positions of the second imaging zone or the partial positions of the second imaging zone surface being replaced by the partial positions of the first imaging zone, the first imaging zone constituting the first surface;

wherein the diopter of the first imaging area is 0 and the first imaging area is suitable for transmitting light rays emitted to the first surface; alternatively, the first imaging zone may have a negative or positive diopter suitable for diverging or focusing light directed to the first surface for vision correction;

the process of imaging the light rays emitted by the image source in the near-eye display device in human eyes through the lens is as follows: the image source emits first polarized light of a first polarization state of a display image to the polarization reflector, the first polarized light is reflected to the phase retarder by the polarization reflector, and when the first polarized light passes through the phase retarder, the first polarized light becomes third polarized light of a third polarization state through phase retardation; the third polarized light exits from the phase retarder to the first surface of the lens and is reflected by the second imaging zone of the first surface; the third polarized light reflected by the second imaging region returns to the phase retarder and becomes second polarized light of a second polarization state by retarding the phase when passing through the phase retarder; the second polarized light passes through the polarizing mirror for human eye imaging.

2. The near-eye display device of claim 1 wherein the second imaging zone has a positive diopter and is further adapted to collimate light rays directed toward the first surface.

3. The near-eye display device of claim 1, wherein the imaging unit is a ring-shaped unit of a ring-shaped structure; and on the first surface, the imaging units of the first imaging area and the imaging units of the second imaging area are staggered and sleeved.

4. A near-eye display device of claim 3, wherein a difference between an outer diameter and an inner diameter of the annular cell of the first imaging zone is no greater than 100 millimeters; the difference between the outer diameter and the inner diameter of the annular unit of the second imaging zone is not less than 0.1 micrometers and not more than 4 millimeters.

5. A near-eye display device as claimed in claim 1, characterized in that at least two imaging units of the first imaging zone and/or at least two imaging units of the second imaging zone are discretely distributed on the first surface.

6. The near-eye display device of claim 5 wherein the imaging unit is a non-overlapping and void-free tiled, closely-spaced graphic structure having a shape comprising at least one of rectangular, regular hexagonal, and regular octagonal.

7. The near-eye display device of claim 5 wherein the imaging unit is of circular configuration.

8. The near-eye display device of claim 7, wherein the imaging units are densely distributed on the first surface, the densely distributed distribution comprising at least one of a rectangular distribution, a regular hexagonal distribution, and a regular octagonal distribution.

9. A near-eye display device as claimed in claim 5, characterized in that the center-to-center spacing of at least two imaging units of the first imaging zone is not less than 0.1 micrometer and not more than 8 millimeters, and/or the center-to-center spacing of at least two imaging units of the second imaging zone is not less than 0.1 micrometer and not more than 8 millimeters.

10. The near-eye display device of claim 5 wherein the area of the imaging element of the single second imaging region is no less than 0.03 square microns and no more than 50 square millimeters.

11. A near-eye display device as claimed in any one of claims 1 to 10, characterized in that the lens is a fresnel lens or a superlens.

12. A near-eye display device as claimed in any one of claims 1 to 10 wherein the first surface is intimately connected to a planar layer having a refractive index that differs from the refractive index of the lens by less than the refractive index of air and the refractive index of the lens.

13. The near-eye display device of claim 1 wherein natural light is transmitted from the first imaging region of the first surface and through the lens, and after being filtered by the phase retarder, the second polarized light of the second polarization state is passed through the polarized mirror for viewing the environment by the human eye.

14. A near-eye display device as claimed in claim 1 or 13, wherein the phase difference between the first polarization state and the second polarization state is 90 degrees phase and the phase retarder is a 45 degree phase retarder.

15. A near-eye display device as claimed in claim 1 or 13, further comprising:

an anti-reflection polarizer disposed between the human eye and the polarizing reflector for transmitting the second polarized light and eliminating the first polarized light directed from the near-eye side of the near-eye display device to the polarizing reflector.

16. The near-eye display device of claim 15, wherein the anti-reflective polarizer is disposed on a first side of the polarizing mirror, the first side being a near-eye side of the polarizing mirror in the near-eye display device.

17. A near-eye display device as defined in claim 1, further comprising:

18. The near-eye display device of claim 16 having a plurality of functionally symmetric cells; the image source, the lens, the polarizing mirror, the phase retarder and the anti-reflective polarizer are disposed in the functionally symmetric unit; and the functional symmetrical units are used for symmetrically splicing and expanding the visual angle.