CN115268079A - Light-emitting component, display module and near-to-eye display equipment - Google Patents

Abstract

The application relates to a light-emitting component, a display module and near-to-eye display equipment. The light emitting assembly includes a substrate, a light emitting unit, and a lens unit. The light emitting unit is arranged on the substrate. The lens unit is arranged on the light emitting side of the light emitting unit, and the optical axis of the lens unit is perpendicular to the central axis of the light emitting unit and deviates from the central axis of the light emitting unit. When above-mentioned light-emitting component is applied to near-eye display device's display module assembly, can realize subducing the effect of ghost image, be favorable to promoting near-eye display device's imaging quality, promote user's use and experience.

Description

Light-emitting component, display module and near-to-eye display equipment

Technical Field

The application relates to the technical field of near-to-eye display, in particular to a light-emitting component, a display module and near-to-eye display equipment.

Background

The near-eye display device comprises Augmented Reality (AR) equipment, mixed Reality (MR) equipment and the like, and virtual images formed by the display module can be fused with a real scene by the near-eye display device, so that immersive visual experience is brought to a user. Accordingly, near-eye display devices are increasingly sought by the industry, and the performance requirements of the industry for near-eye display devices are also increasing. However, the current near-eye display device is easy to generate ghost images, and the use experience of the user is seriously influenced.

Disclosure of Invention

The embodiment of the application provides a light-emitting component, a display module and near-eye display equipment, and aims to solve the problem that ghost images are easily generated by the existing near-eye display equipment.

A light emitting assembly comprising:

a substrate;

a light emitting unit disposed on the substrate; and the number of the first and second groups,

the lens unit is arranged on the light emitting side of the light emitting unit, and the optical axis of the lens unit is perpendicular to the central axis of the light emitting unit and deviates from the central axis of the light emitting unit in the direction of the central axis.

A display module having a central field of view and an edge field of view, the display module comprising:

a substrate; and the number of the first and second groups,

and the light-emitting assemblies are arranged on the substrate in an array manner, wherein the main light rays emitted by the light-emitting assemblies in the edge view field are inclined to the central axis of the light-emitting surfaces of the light-emitting assemblies.

A near-eye display device comprises a projection lens group, a light guide module group and a display module group according to any one of the embodiments, wherein the projection lens group is arranged between the light guide module group and the display module group.

According to the light emitting assembly, the optical axis of the lens unit deviates from the central axis of the light emitting unit in the direction perpendicular to the central axis of the light emitting unit, so that the emergent principal ray of the light emitting assembly is inclined to the central axis of the light emitting unit. From this, when light-emitting component is applied to during the display module assembly of near-eye display device, the light that light-emitting component transmitted is through the projection mirror group of near-eye display device and projects the leaded light module assembly, get back to the display module assembly through the reflection of leaded light module assembly, when projecting the mirror group through the display module reflection again, at least partial reflection light can deviate the receipts light cone angle of projecting the mirror group and can't get into the leaded light module group and produce the ghost image, thereby realize subducing the effect of ghost image, be favorable to promoting near-eye display device's imaging quality, and then promote user's use and experience.

Drawings

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

FIG. 1 is a schematic diagram of a near-eye display device worn on a user's head in some embodiments;

FIG. 2 is a schematic diagram of a near-eye display device in some embodiments;

FIG. 3 is a schematic illustration of the exit path of light emitting elements in an edge field of view in some embodiments;

FIG. 4 is a schematic illustration of the exit path of the light emitting assembly in a central field of view in some embodiments;

FIG. 5 is a schematic diagram illustrating a relationship between a principal ray emitted from the light emitting device and a viewing angle in some embodiments;

FIG. 6 is a schematic view of the exit path of a light emitting assembly positioned in a quasi-centered field of view in some embodiments;

FIG. 7 is a schematic diagram illustrating the relationship between the chief ray emitted from the light emitting device and the viewing angle in other embodiments;

FIG. 8 is a schematic view of the exit paths of light emitting elements in different fields of view in further embodiments;

FIG. 9 is a schematic diagram of some embodiments of light emitting assemblies in an edge field of view;

FIG. 10 is a diagram illustrating the relationship between the offset of the lens unit relative to the light-emitting unit and the field angle in some embodiments;

FIG. 11 is a schematic diagram of a light assembly positioned in a central field of view in some embodiments;

FIG. 12 is a schematic diagram illustrating a relationship between a shift amount of a lens unit relative to a light-emitting unit and a viewing angle in another embodiment;

FIG. 13 is a schematic view of a display module and a projection lens assembly according to some embodiments.

Reference numerals are as follows:

10. a near-eye display device; 11. a display module; 111. a substrate; 112. a light emitting element; 1121. a light emitting unit; 1122. a light emitting surface; 1123. a lens unit; 1124. a substrate; 113. a reflective element; 114. a light-combining prism; 115. a red light module; 116. a green light module; 117. a blue light module; 12. a projecting lens group; 13. a light guide module; 131. an optical waveguide; 132. an input coupling grating; 133. an output coupling grating; 20. a user.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Optical systems of near-to-eye display devices such as AR devices and MR devices are generally provided with a display module for emitting light, a projection lens group for projecting light, and a light guide module for transmitting light, wherein the projection lens group is used in a light guide module for projecting light emitted by the display module, and the light guide module is used for fusing light emitted by the display module and light of a real scene, and conducting the light to eyeballs of users, so as to bring immersive visual experience to the users. The display module is provided with a plurality of light emitting assemblies arranged in an array, each light emitting assembly can emit light, the projecting mirror group can receive and project at least part of light emitted by the light emitting assemblies to the light guide module, the angle at which the projecting mirror group can receive the light emitted by the light emitting assemblies is the light receiving cone angle of the projecting mirror group, and the light in the light receiving cone angle emitted by the light emitting assemblies can be projected to the light guide module by the projecting mirror group. In the related art, a portion of light emitted by the display module and projected to the light guide module by the projecting lens group is reflected by the light guide module to form reflected light, and the reflected light is returned to the display module by the projecting lens group, and further returned to the light guide module by the projecting lens group after being reflected by the display module.

The projection lens group generally comprises one or more lenses, because the imaging of the lenses has a conjugate characteristic, the position of the reflected light returning to the display module through the projection lens group is generally different from the position of the light-emitting component emitting the light, and the reflected light is reflected by the display module again and is generally positioned in the light-receiving cone angle of the projection lens group, so that the reflected light returns to the light-guiding module through the projection lens group again to form an image different from the image displayed by the display module. For example, the reflection position of part of the reflected light in the display module and the position of the light emitted by the display module are distributed in central symmetry, so that when the part of the reflected light is transmitted to the eyeball of the user through the projection lens group and the light guide module, ghost images which are upside down from top to bottom and from right to left with the image displayed by the display module are easily formed, and the viewing experience of the user is affected.

In order to solve the above problems, the present application provides a light emitting device, a display module and a near-to-eye display apparatus.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram illustrating a near-eye display device 10 worn on a head of a user 20 according to some embodiments, and fig. 2 is a schematic diagram illustrating a structure of the near-eye display device 10 according to some embodiments. The near-eye display device 10 provided by the present application includes, but is not limited to, AR head-mounted devices such as AR glasses, AR helmets, etc., or MR head-mounted devices such as MR glasses, MR helmets, etc. The near-eye display device 10 may include a display module 11, a projecting lens group 12 and a light guide module 13, the display module 11 is configured to emit light, and the display module 11 may include various display screens capable of emitting light to display images, such as a Micro LED display screen (Micro LED display screen), a self-luminous single-panel color Micro-LED Micro display screen, and the like. The projecting lens group 12 can be a collimating lens group, the projecting lens group 12 can include one or more lenses with focal power, and the projecting lens group 12 is used for adjusting the light emitted by the display module 11 and projecting the adjusted light into the light guide module 13. For example, the projection lens group 12 can collimate the light emitted by the display module 11 to form parallel light, and the parallel light is projected into the light guide module 13, so that the display module 11 and the projection lens group 12 cooperate to form a lambertian light source, which is beneficial to improving the imaging quality of the near-eye display device 10. The light guide module 13 is used for fusing the light emitted by the display module 11 with the light of the real scene, and conducting the fused light to the eyeball of the user 20 for the user 20 to watch.

The light guide module 13 may include an optical waveguide 131, an input coupling grating 132, and an output coupling grating 133, where the input coupling grating 132 and the output coupling grating 133 are disposed on the optical waveguide 131. The input coupling grating 132 is disposed at a position where the light emitted from the display module 11 enters the optical waveguide 131, and the output coupling grating 133 is disposed at a position where the light in the optical waveguide 131 exits to the eyeball of the user 20. The input coupling grating 132 can input light of a real scene and light emitted by the display module 11 into the optical waveguide 131 through processes of diffraction, refraction and the like, the optical waveguide 131 transmits the light input by the input coupling grating 132 into the output coupling grating 133 through processes of total reflection, diffraction and the like, and then the light is projected to eyeballs of the user 20 through processes of diffraction, refraction and the like of the output coupling grating 133.

In the embodiment shown in fig. 2, the light guiding module 13 only includes one set of the light waveguide 131, the input coupling grating 132 and the output coupling grating 133, and actually, the light guiding module 13 may further include two, three or more sets of the light waveguide 131, the input coupling grating 132 and the output coupling grating 133, so as to couple and conduct light of different wavebands into different light waveguides 131, thereby improving the imaging quality of the near-eye display device 10.

Certainly, the near-eye display device 10 may further include functional modules, such as an audio module, a wireless communication module, and a data processing module, which are not shown in the figure, and each functional module cooperates with the display module 11, the projecting lens group 12, and the light guide module 13 to implement complete AR or MR imaging. The specific configuration of the modules in the near-eye display device 10 may be selected according to actual requirements, and will not be described herein.

Further, referring to fig. 2 and 3, in some embodiments, the display module 11 includes a substrate 111 and a plurality of light emitting elements 112 disposed on the substrate 111 in an array. The number of the light emitting elements 112 may correspond to the number of the pixels of the display module 11, and the arrangement rule of the light emitting elements 112 may be set according to the pixel display requirement of the display module 11. It can be understood that the display module 11 includes a central field of view and an edge field of view, and the maximum field angle of the display module 11 corresponds to the range of the edge field of view, and the field angle gradually increases in the direction in which the central field of view points to the edge field of view. In some embodiments, the chief ray b emitted from the light emitting element 112 in the fringe field of view is inclined to the central axis c of the light emitting surface 1122 of the light emitting element 112.

In the present application, a stop (not shown) is disposed in the optical path of the near-eye display device 10, and the chief ray emitted from a certain light-emitting component 112 can be understood as the ray emitted by the light-emitting component 112 and passing through the center of the stop. The light emitting device 112 may include a light emitting unit 1121, the light emitting unit 1121 may be a Micro LED chip, and when the light emitted by the light emitting device 112 originates from the light emitting unit 1121 in the light emitting device 112, a light emitting surface 1122 of the light emitting unit 1121 is a light emitting surface 1122 of the light emitting device 112, and a central axis of the light emitting surface 1122 of the light emitting device 112 may be understood as a central axis of the light emitting unit 1121 in the light emitting device 112. The central axis of a light emitting unit 1121 is defined as a straight line passing through the geometric center of the surface of the light emitting unit 1121 facing projection lens assembly 12 and perpendicular to the surface of the light emitting unit 1121 facing projection lens assembly 12.

It can be understood that, since the image formation of the projecting lens group 12 has a conjugate characteristic, in the conventional near-eye display device, when a chief ray emitted from a certain light emitting element coincides with the central axis of the light emitting surface 1122 of the light emitting element, a light ray emitted from the light emitting element within the light receiving cone angle range of the projecting lens group is reflected by the light guide module and returns to the display module, and then is reflected by the display module toward the projecting lens group to form a reflected light ray, and the reflected light ray is usually still within the light receiving cone angle of the projecting lens group, so that a ghost image is easily formed when the projecting lens group projects into the light guide module.

Referring to fig. 3, in the near-eye display device 10 of the present application, the principal ray b emitted from the light emitting element 112 in the peripheral field of view is inclined to the central axis c of the light emitting surface 1120 of the light emitting element 112, and the light ray e emitted from the light emitting element 112 and located within the light collecting cone angle d of the projecting lens group 12 can be received by the projecting lens group 12 and projected into the light guiding module 13. Part of the light e is reflected by the input coupling grating 132, the optical waveguide 131 or other elements of the light guiding module 13 to form light f which returns to the display module 11 through the projecting mirror 12. At this time, the arrangement of the principal ray b inclined to the central axis c may affect the angle of the light f incident into the display module 11, so as to change the reflection angle of the light f on the display module 11, resulting in that the light g formed by the reflection of the light f by the display module 11 at least partially deviates from the range of the light-collecting cone angle d of the projecting mirror group 12, and further causing at least part of the light g to be unable to be received by the projecting mirror group 12 and projected into the light guide module 13 to form a ghost image. From this, the foretell display module assembly 11 of this application can reduce the light guide module assembly 13 reflection and get back to at least partly form the ghost image in the light guide module assembly 13 that returns once more in display module assembly 11's the light to realize subduing the effect of ghost image, be favorable to promoting near-to-eye display device 10's imaging quality, and then promote user 20's use and experience.

It can be understood that, as long as there is an included angle between the chief ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112, the light emitted from the light emitting element 112 can be reflected back to the display module 11 through the light guiding module 13, and at least part of the reflected light deviates from the light receiving cone angle of the projecting lens group 12 and cannot enter the light guiding module 13 when being reflected by the display module 11, so as to achieve the purpose of reducing at least part of the reflected light and returning to the light guiding module 13 to form a ghost image, thereby reducing at least part of the ghost image, and achieving the effect of improving the imaging quality of the near-eye display device 10. Therefore, an included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 is not limited, and may be specifically set according to a requirement of eliminating a ghost image.

Of course, the greater the included angle between the principal ray emitted from the light emitting element 112 located in the peripheral field of view and the central axis of the light emitting surface 1122 of the light emitting element 112, the more obvious the ghost image eliminating effect is. In some embodiments, an included angle between a principal ray emitted from the light emitting element 112 in the fringe field of view and a central axis of the light emitting surface 1122 of the light emitting element 112 is greater than or equal to 5 °, so that at least a portion of the reflected light can be eliminated from returning to the light guide module 13 to form a ghost image, thereby eliminating a portion of the ghost image.

Further, referring to fig. 3, in some embodiments, an included angle between a chief ray emitted from the light emitting element 112 in the peripheral field of view and a central axis of the light emitting surface 1122 of the light emitting element 112 is greater than half of a light collecting cone angle of the projecting lens group 12 corresponding to the light emitting element 112, so that ghost images can be reduced to the maximum extent. In some embodiments, the light-collecting cone angle of the projection lens group 12 corresponding to the light-emitting element 112 of the peripheral field of view is 20 °, for example, the light-collecting cone angle d of the projection lens group 12 corresponding to the light-emitting element 112 is 20 °. The included angle between the principal ray b emitted from the light emitting element 112 and the central axis c of the light emitting surface 1122 of the light emitting element 112 is greater than or equal to half of the light cone angle d, i.e., greater than or equal to 10 °. Therefore, when the light e emitted by the light emitting element 112 returns to the light g reflected by the display module 11 through the light guide module 13, the reflection direction of the light g completely deviates from the light collection cone angle d of the projection lens set 12 corresponding to the reflection position, so that the light g cannot be received by the projection lens set 12 and is projected to the light guide module 13 to the maximum extent, and the light g is prevented from returning to the light guide module 13 to form ghost images to the maximum extent.

Certainly, the included angle between the principal ray emitted from the light emitting element 112 located in the peripheral field of view and the central axis of the light emitting surface 1122 of the light emitting element 112 cannot be too large, so as to avoid that the light emitted from the light emitting element 112 enters the projecting mirror group 12 at too large an angle and is reflected by the projecting mirror group 12, and cannot be projected to the light guiding module 13 by the projecting mirror group 12, thereby reducing the light emitting efficiency of the display module 11. In some embodiments, when the light-converging cone angle of the projecting lens group 12 corresponding to the light-emitting element 112 is 20 °, an included angle between a chief ray emitted from the light-emitting element 112 and a central axis of the light-emitting surface 1122 of the light-emitting element 112 is less than or equal to 30 °, so as to avoid that the chief ray is excessively deviated to influence the light utilization rate of the near-eye display device 10.

It should be noted that light emitted by light emitting assemblies 112 in the central field of view is less likely to affect the imaging quality of near-eye display device 10 relative to light emitting assemblies 112 in the peripheral field of view. Specifically, referring to fig. 3 and 4, in the embodiment shown in fig. 4, the principal ray emitted from the light emitting element 112 in the central view field coincides with the central axis of the light emitting surface 1122 of the light emitting element 112, because the principal ray emitted from the light emitting element 112 passes through the optical axis of the projecting lens group 12, the light ray h emitted from the light emitting element 112 is reflected back to the display module 11 by the light guiding module 13, and then the light ray i formed by reflection from the display module 11 substantially coincides with the light ray h, so that a ghost image different from the display image formed by the light ray h is not easily formed. Meanwhile, because the light i is reflected by the light guide module 13 and the display module 11 for multiple times, the intensity of the light i is much smaller than that of the light h, even if a ghost image is formed, the ghost image can be covered by the image of the light h, and the imaging quality of the near-eye display device 10 is not easily influenced.

Therefore, in some embodiments, while the principal ray emitted from the light emitting element 112 in the edge field of view is inclined to the central axis of the light emitting surface 1122 of the light emitting element 112 to reduce the ghost image formed by at least a portion of the light emitted from the light emitting element 112 in the edge field of view returning to the display module 11, the principal ray emitted from the light emitting element 112 in the central field of view and the central axis of the light emitting surface 1122 of the light emitting element 112 may be parallel or overlapped. With such an arrangement, ghost images of the near-eye display device 10 can be reduced, and adjustment of the main light emitted by the light emitting assembly 112 in the full view field is not needed, which is beneficial to simplifying the design and manufacturing process of the display module 11.

Based on the difference between the imaging of the reflected light rays in the peripheral field of view and the imaging of the reflected light rays in the central field of view, as shown in fig. 3, 4 and 5, in some embodiments, the included angle between the chief ray emitted from the light emitting component 112 and the central axis of the light emitting surface 1122 of the light emitting component 112 gradually increases in the direction in which the central field of view points to the peripheral field of view, i.e., in the direction in which the display module 11 points to the edge toward the geometric center of the surface of the projecting mirror group 12. For example, in the embodiment shown in fig. 5, the chief ray of the light emitting element 112 in the central view field is parallel to the central axis of the light emitting surface 1122 of the light emitting element 112, and the angle between the chief ray of the light emitting element 112 in the peripheral view field and the central axis of the light emitting surface 1122 of the light emitting element 112 is greater than half of the light collection cone angle of the corresponding projecting lens group 12. The abscissa of fig. 5 is the viewing angle of the display module 11 corresponding to the position of the light emitting element 112, and the ordinate is the included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112. As can be seen from fig. 5, in the present embodiment, as the angle of view at the corresponding position increases, an included angle between a principal ray emitted from the light emitting element 112 and a central axis of the light emitting surface 1122 of the light emitting element 112 also gradually increases.

It is understood that in the embodiment shown in fig. 5, since the included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 increases with the increase of the field angle, the included angle between the principal ray emitted from the light emitting element 112 in the quasi-central field of view and the central axis of the light emitting surface 1122 of the light emitting element 112 in the peripheral field of view, for example, may not be greater than half of the light converging cone angle of the projecting lens group 12 corresponding to the quasi-central field of view, and thus some of the rays emitted from the light emitting element 112 in the quasi-central field of view may still form ghost images.

Specifically, as shown in fig. 6, the principal ray emitted from the light emitting element 112 in the quasi-central view field is inclined to the central axis of the light emitting surface 1122 of the light emitting element 112, but the included angle between the principal ray emitted from the light emitting element 112 in the quasi-central view field and the central axis of the light emitting surface 1122 of the light emitting element 112 is smaller than the light-collecting cone angle of the projecting lens group 12 corresponding to the quasi-central view field. The light j emitted from the light emitting element 112 located in the quasi-central field of view is reflected by the light guiding module 13 and then reflected by the display module 11 to form a light k, at least a portion of the light k deviates from the light converging cone angle of the corresponding projecting lens group 12 and cannot return to the light guiding module 13 to form a ghost image, while a portion of the light k may be located in the light converging cone angle of the corresponding projecting lens group 12, and the portion of the light k may be received by the projecting lens group 12 and projected to the light guiding module 13 to form a ghost image.

Therefore, in the present embodiment, the near-eye display device 10 can reduce the ghost image formed by the light emitting components 112 located in the edge field to the maximum extent, and reduce part of the ghost image formed by the light emitting components 112 located in the quasi-center field, while the light emitting components 112 located in the center field are not easy to form the ghost image, even if the ghost image is formed, the imaging quality of the near-eye display device 10 is less affected, so that the imaging quality of the near-eye display device 10 can be improved, and the use experience effect of the user 20 is improved. Meanwhile, the included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 increases with the increase of the field angle, which is beneficial to the design and manufacture of the display module 11.

In some embodiments, an included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 is in a direct proportion to the viewing angle, so that the difficulty in designing and forming the display module 11 can be reduced. Further, referring to fig. 5, in some embodiments, an included angle between a principal ray emitted from the light emitting element 112 and a central axis of the light emitting surface 1122 of the light emitting element 112 is equal to a corresponding field angle of the light emitting element 112. The ghost image can be effectively reduced, and the design and the manufacture of the display module 11 are facilitated. As can be seen from fig. 5, half of the light-converging cone angle of the projecting mirror group 12 in the present embodiment is 10 °, and the near-eye display device 10 can maximally reduce the risk of ghost images formed by the light emitted from the light emitting elements 112 with the corresponding field angles greater than or equal to 10 °.

It should be noted that, fig. 3 only illustrates a schematic diagram of two of the light emitting assemblies 112 located in the edge field of view, actually, a plurality of light emitting assemblies 112 may be distributed in an array on the surface of the substrate 111 facing the projection module, and the light emitting assemblies 112 located in the edge area of the substrate 111 may all be located in the edge field of view, a plurality of light emitting assemblies 112 may also be disposed at the position of the substrate 111 corresponding to the center field of view, and the number and arrangement rule of the light emitting assemblies 112 may be designed according to the requirements of the pixels and the field angle of view of the display module 11.

It should be noted that fig. 5 only illustrates the relationship between the angle between the principal ray and the central axis and the corresponding viewing angle in one embodiment, but the arrangement of the display module 11 is not limited thereto, as long as it can play a role of reducing at least part of ghost images. For example, in some embodiments, the included angle between the chief ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 increases gradually in the direction in which the central field of view points to the peripheral field of view, but is not proportional to the field of view. In other embodiments, the included angles between the principal ray emitted from the light emitting element 112 with the corresponding field angle greater than or equal to 10 ° and the central axis of the light emitting surface 1122 of the light emitting element 112 may be equal to each other, and equal to or equal to 10 °, so as to reduce ghost images generated by the light emitting element 112 with the corresponding field angle greater than or equal to 10 ° to the maximum extent.

Referring to fig. 3 again, it can be understood that when the light g reflected by the display module 11 deviates from the light-receiving cone angle of the corresponding projection lens assembly 12, the light g cannot be received by the projection lens assembly 12 and is projected to the light guide module 13, and the light g may be absorbed by the outer frame (not shown) of the display module 11, the substrate 111, or a component with weak reflection effect in the light emitting element 112 through one or more reflections. Certainly, a part of the light g may also enter the projecting lens group 12 after being reflected once or multiple times and be projected into the light guiding module 13, and at this time, because the light g is relatively scattered and loses the conjugate property with the light emitted by the light emitting element 112, the light g entering the light guiding module 13 may form background stray light instead of a ghost image, and the influence of the ghost image on the imaging quality can also be reduced.

As can be seen from the above description, in the embodiment shown in fig. 5, the light emitted from the light emitting element 112 with the field angle smaller than 10 ° may still generate ghost images, which may affect the imaging quality of the near-eye display device 10. In other embodiments, the chief rays emitted from the light emitting element 112 in the full field of view, including the peripheral field of view, the quasi-central field of view, and the central field of view, are oblique to the central axis of the light emitting surface 1122 of the light emitting element 112. Referring to fig. 7, the abscissa in fig. 7 is the viewing angle of the display module 11, the ordinate is the included angle between the chief ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112, the dotted line in fig. 7 represents the light collecting cone angle of the projecting lens group 12, and the solid line represents the included angle between the chief ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112.

As can be seen from fig. 7, in some embodiments, the included angle between the principal ray emitted from the light emitting element 112 in the full view field range and the central axis of the light emitting surface 1122 of the light emitting element 112 is greater than the light collecting cone angle of the projecting lens group 12, so that the light emitted from the light emitting element 112 in the full view field range can be reflected back to the display module 11 through the light guiding module 13, and the reflected light generated by the reflection of the display module 11 deviates from the light collecting cone angle of the projecting lens group 12, thereby reducing ghost images generated by the full view field light to the maximum extent and improving the imaging quality of the near-eye display device 10.

Referring to fig. 7, in some embodiments, the included angles between the principal ray emitted from the light emitting element 112 in the full field of view and the central axis of the light emitting surface 1122 of the light emitting element 112 are all equal, which is beneficial to batch design and manufacture of the light emitting element 112, thereby greatly reducing the difficulty in designing and manufacturing the display module 11. In the embodiment shown in fig. 7, the included angle between the chief ray emitted from the light emitting element 112 in the full field of view and the central axis of the light emitting surface 1122 of the light emitting element 112 is 15 °, however, the included angle can be set in other ways as long as it is greater than or equal to the light collecting cone angle of the corresponding projecting lens group 12. Specifically, in some embodiments, the included angles between the principal ray emitted from the light emitting element 112 in the full field of view and the central axis of the light emitting surface 1122 of the light emitting element 112 are all between 10 ° and 30 °, so that ghost images can be reduced to the maximum extent, and the influence of excessive deviation of the principal ray on the light utilization rate of the near-eye display device 10 can be avoided. Of course, the included angles between the chief rays emitted from the light emitting elements 112 within the full view field range and the central axis of the light emitting surface 1122 of the light emitting elements 112 may also be unequal, as long as the chief rays are all larger than the light collecting cone angle of the corresponding projecting mirror group 12, so as to reduce the ghost image within the full view field range to the maximum extent.

Referring to fig. 7 and 8, light L shown in fig. 8 is light emitted from the light emitting elements 112 in the central view field, light m is reflected light formed by the light L being reflected by the light guide module 13 and then being reflected by the display module 11, light n is light emitted from the light emitting elements 112 in the edge view field, light o is reflected light formed by the light n being reflected by the light guide module 13 and then being reflected by the display module 11, and both light m and light o are not within the light converging cone angle range of the projecting lens group 12. In the embodiment shown in fig. 7 and 8, the included angles between the principal light rays emitted from the light emitting elements 112 in the full view field range and the central axis of the light emitting surfaces 1122 of the light emitting elements 112 are all greater than or equal to the light converging cone angle of the corresponding projecting lens group 12, so that the reflected light rays formed after the light rays emitted from the light emitting elements 112 in the full view field range are reflected by the light guide module 13 and the display module 11 deviate from the light converging cone angle of the corresponding projecting lens group 12, thereby reducing the ghost image in the full view field to the maximum extent.

Of course, the specific arrangement manner of inclining the principal ray emitted from the light emitting assembly 112 to the central axis of the light emitting unit 1121 is not limited as long as the effect of reducing at least part of ghost images is achieved. Referring to fig. 3 and 9, in some embodiments, the principal ray r emitted from the light emitting assembly 112 is inclined to the central axis q of the light emitting unit 1121 by offsetting the optical axis p of the lens unit 1123 in the light emitting assembly 112 from the central axis q of the light emitting unit 1121 in a direction perpendicular to the central axis q of the light emitting unit 1121. Specifically, in some embodiments, the light emitting assembly 112 further includes a substrate 1124 and a reflective element 113, the reflective element 113 is disposed on the substrate 1124, the light emitting unit 1121 is disposed on a side of the reflective element 113 away from the substrate 1124, and the lens unit 1123 is disposed on a side of the light emitting assembly 112 away from the substrate 1124, or disposed on the substrate 1124 and covering the light emitting unit 1121.

In some embodiments, the lens unit 1123 may be a lens or a lens group with optical power for adjusting the light emitted from the light emitting unit 1121 and projecting the light toward the projecting lens group 12. For example, the lens unit 1123 may be a collimating lens or a collimating lens group having positive refractive power, and the lens unit 1123 is configured to collimate light emitted by the light emitting unit 1121 and then project the light to the projecting lens group 12, and in cooperation with the arrangement of the projecting lens group 12, the parallelism of light emitted from the display module 11 and the projecting lens group 12 as a whole can be improved, thereby facilitating improvement of the imaging quality of the near-eye display device 10.

It is understood that when the lens unit 1123 is a spherical lens, the optical axis of the lens unit 1123 passes through the center of the surface of the lens unit 1123 facing away from the light emitting unit 1121. Among the light rays emitted by the light emitting unit 1121, the light ray traveling direction passing through the center of the surface of the lens unit 1123 is unchanged, and the light rays passing through the rest of the surface of the lens unit 1123 are usually deflected by the lens unit 1123 to change the traveling direction, so that the light rays emitted by the light emitting unit 1121 form a substantially parallel light beam after passing through the lens unit 1123. In a conventional display module of a near-eye display device, an optical axis of a lens unit of a light emitting assembly generally overlaps with a central axis of the light emitting unit, light emitted by the light emitting unit along the central axis direction passes through a center of a surface of the lens unit, light emitted by other positions of the light emitting unit passes through a surface of a projection unit and is generally deflected toward the center of the surface of the lens unit, and light emitted by the conventional light emitting assembly is generally distributed symmetrically with respect to the center of the surface of the lens unit. Therefore, the main light beam emitted from the conventional light emitting assembly usually overlaps with the optical axis of the lens unit and the central axis of the light emitting unit, so that the reflected light beam formed by the light beam reflected by the light guide module and the display module is still within the light-collecting cone angle of the projection lens set, and is easy to return to the light guide module to generate ghost images.

Referring to fig. 9, in the light emitting device 112 in some embodiments of the present application, the optical axis of the lens unit 1123 is offset from the central axis of the light emitting unit 1121 in a direction perpendicular to the central axis of the light emitting unit 1121, so that the outgoing angle of the light passing through the center of the surface of the lens unit 1123 is inclined to the central axis of the light emitting unit 1121, in other words, the principal light emitted by the light emitting device 112 is inclined to the central axis of the light emitting unit 1121. Therefore, when the light emitting element 112 is applied to the display module 11 of the near-eye display device 10, the reflected light formed by the light emitted from the light emitting element 112 reflected by the light guiding module 13 and the display module 11 is at least partially located outside the light-collecting cone angle range of the projecting lens 12 and cannot be projected to the light guiding module 13 by the projecting lens 12, so as to achieve the effect of reducing at least part of ghost images.

It should be noted that in the embodiment shown in fig. 9, the lens unit 1123 is offset from the central axis of the light emitting unit 1121 in a direction perpendicular to the central axis of the light emitting unit 1121, i.e., along the surface of the reflective element 113, but the optical axis of the lens unit 1123 is still parallel to the central axis of the light emitting unit 1121. In other embodiments, the optical axis of the lens unit 1123 may be inclined to the central axis of the light emitting unit 1121, for example, the lens unit 1123 is also inclined to the reflective element 113 as a whole, as long as the optical axis of the lens unit 1123 and the central axis of the light emitting unit 1121 have a certain deviation in a direction perpendicular to the central axis of the light emitting unit 1121, so that the principal ray emitted from the light emitting assembly 112 is inclined to the central axis of the light emitting unit 1121.

In the near-eye display device 10 in some embodiments of the present application, by laterally shifting the lens unit 1123 of the light emitting element 112, the principal ray emitted by the light emitting element 112 is inclined to the central axis of the light emitting unit 1121, so that at least part of ghost images is reduced, the setting orientation of the light emitting element 112 in the display module 11 is not affected, the setting orientation of any two of the display module 11, the projecting lens group 12 and the light guide module 13 is not changed, for example, the display module 11 and the light guide module 13 are not relatively inclined, and the emitting direction of the light projected by the light guide module 13 to the eyeball of the user 20 is not affected. Therefore, the near-eye display device 10 of the present application does not excessively increase the difficulty in designing and manufacturing the near-eye display device 10, and does not affect the viewing experience of the user 20 while reducing at least part of ghost images.

As can be understood from fig. 5, fig. 9 and fig. 10, the offset between the optical axis of the lens unit 1123 and the central axis of the light-emitting unit 1121 in the direction perpendicular to the central axis of the light-emitting unit 1121 influences the size of the included angle between the chief ray emitted from the light-emitting assembly 112 and the central axis of the light-emitting surface 1122 of the light-emitting assembly 112, and the larger the offset is, the larger the included angle between the chief ray and the central axis is. Thus, in the embodiment shown in fig. 5, as the angle of view of the light emitting assembly 112 increases, the included angle between the principal ray emitted from the light emitting assembly 112 and the central axis of the light emitting assembly 112 increases, and thus the offset between the optical axis p of the lens unit 1123 in the light emitting assembly 112 and the central axis q of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 also increases.

Referring to fig. 10 in particular, the abscissa shown in fig. 10 is the viewing angle of the display module 11, and the ordinate is the offset of the optical axis of the lens unit 1123 from the central axis of the light-emitting unit 1121 in the direction perpendicular to the central axis of the light-emitting unit 1121. As can be seen from fig. 5 and 10, as the angle of view increases, the included angle between the principal ray emitted from the light emitting assembly 112 and the central axis of the light emitting surface 1122 of the light emitting assembly 112 gradually increases, and accordingly, the offset amount of the optical axis of the lens unit 1123 in the light emitting assembly 112 from the central axis of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 also increases.

As shown in fig. 10 and 11, in some embodiments, the optical axis of the lens unit 1123 coincides with the central axis of the light-emitting unit 1121 in the light-emitting assembly 112 located in the central field of view. When the field angle is equal to half of the convergent cone angle of the projecting lens group 12, i.e. 10 °, the included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 is also 10 °, and the offset between the optical axis of the lens unit 1123 in the light emitting element 112 and the central axis of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 is 4um. The embodiment of fig. 10 corresponds to the embodiment of fig. 5, the offset amount of the optical axis of the lens unit 1123 from the central axis of the light emitting unit 1121 increases as the angle of view increases, and the offset amount is in a proportional relationship with the angle of view.

Of course, in other embodiments, the offset may not be directly proportional to the field of view, as long as at least some ghost images are reduced. For example, in other embodiments, in the light emitting elements 112 located in the quasi-central field and the peripheral field, the offset of the optical axis of the lens unit 1123 from the central axis of the light emitting unit 1121 is any suitable value greater than or equal to 4um, and the offset values of the light emitting elements 112 may be equal or different. Of course, in the light emitting assembly 112 located in the quasi-central view field and in the peripheral view field, the offset of the optical axis of the lens unit 1123 relative to the central axis of the light emitting unit 1121 may also be between 2um and 4um, so as to achieve the effect of reducing part of ghost images.

Similarly, as shown in fig. 7 and fig. 12, when the principal rays emitted from the light emitting elements 112 in the full field of view range are inclined to the central axis of the light emitting surface 1122 of the light emitting elements 112, the optical axes of the lens units 1123 in the light emitting elements 112 in the full field of view range are all deviated from the central axis of the light emitting units 1121. In the embodiment shown in fig. 12, which corresponds to fig. 7, the included angle between the principal ray emitted from the light emitting element 112 and the central axis of the light emitting surface 1122 of the light emitting element 112 in the full view range is 15 °, and the offset between the optical axis of the lens unit 1123 and the central axis of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 in the light emitting element 112 in the full view range is 12um. Of course, the shift amounts of the lens units 1123 in the light emitting elements 112 within the full field of view may also be unequal, as long as they are all greater than or equal to 4um, so as to effectively reduce the ghost images within the full field of view.

It can be understood that the light emitted from the light-emitting unit 1121 needs to be incident on the lens unit 1123 to be able to be projected onto the projecting lens group 12 better, and if the offset of the lens unit 1123 relative to the light-emitting unit 1121 is too large, it is easy to cause a portion of the light not to be deflected by the lens unit 1123 and projected onto the projecting lens group 12. Therefore, in some embodiments, an offset between the optical axis of the lens unit 1123 and the central axis of the light-emitting unit 1121 in a direction perpendicular to the central axis of the light-emitting unit 1121 is less than or equal to 12um, so that the lens unit 1123 can be prevented from deviating from the light-emitting unit 1121 excessively to reduce the light-emitting efficiency of the light-emitting assembly 112.

It is to be understood that the specific values of the offset of the optical axis of the lens unit 1123 from the central axis of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 are only the values of the offset listed based on the corresponding relationship between the specific structure of the light emitting assembly 1121 and the angle of the principal ray exemplified in the present application. In fact, it can be known to those skilled in the art that when the structural feature of the light emitting element 1121 is changed, the corresponding relation between the chief ray angle and the above offset can also be changed.

Specifically, in the embodiment shown in fig. 9, a connection line between the optical axis of the lens unit 1123 and the central axis of the light-emitting unit 1121 in the direction perpendicular to the central axis of the light-emitting unit 1121, a central axis q of the light-emitting unit 1121, and a principal ray r form a right triangle, in which an offset between the optical axis of the lens unit 1123 and the central axis of the light-emitting unit 1121 in the direction perpendicular to the central axis of the light-emitting unit 1121 is a dimension of one of right-angled sides, and a portion of the central axis q of the light-emitting unit 1121 in the right triangle is another right-angled side. It can be seen that, in the triangle, the ratio of the offset of the optical axis of the lens unit 1123 from the central axis of the light-emitting unit 1121 in the direction perpendicular to the central axis of the light-emitting unit 1121 to the size of the portion of the central axis q of the light-emitting unit 1121 in the triangle is equal to the tangent of the included angle between the principal ray r and the central axis q of the light-emitting unit 1121. In the present application, the amount of displacement of the optical axis of the lens unit 1123 from the central axis of the light-emitting unit 1121 in the direction perpendicular to the central axis of the light-emitting unit 1121 may be calculated from the above-described tangent relationship. It is understood that when the structure of the lens unit 1123 is changed, for example, the size of the lens unit 1123 in the axial direction is changed, or the position of the center of the surface of the lens unit 1123 is changed to change the position of the optical axis of the lens unit 1123, the size of the portion of the central axis q of the light emitting unit 1121 in the triangle is changed, and accordingly, the corresponding relation between the included angle (the angle of the principal ray) between the principal ray r and the central axis q of the light emitting unit 1121 and the offset amount of the optical axis of the lens unit 1123 and the central axis of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 is changed. In summary, when the structure of the light emitting assembly 112 is changed, the offset between the optical axis of the lens unit 1123 and the central axis of the light emitting unit 1121 in the direction perpendicular to the central axis of the light emitting unit 1121 may also be changed, and the specific offset can be calculated according to the above description, as long as the included angle is formed between the principal ray r and the central axis of the light emitting unit 1121, so as to achieve the effect of reducing at least part of ghost rays.

It should be noted that, when the surface of the lens unit 1123 is a spherical surface, the optical axis of the lens unit 1123 passes through the center of the surface of the lens unit 1123 away from the light-emitting unit 1121, and a connection line between the center of the surface of the lens unit 1123 away from the light-emitting unit 1121 and the center of the surface of the light-emitting unit 1121 facing the lens unit 1123 can be regarded as being coincident with the principal ray emitted from the light-emitting assembly 112, so that an included angle between the principal ray emitted from the light-emitting assembly 112 and the central axis of the light-emitting unit 1121 is equal to an included angle between a connection line between the center of the surface of the lens unit 1123 away from the light-emitting unit 1121 and the center of the surface of the light-emitting unit 1121 facing the lens unit 1123 and the central axis of the light-emitting unit 1121.

It can be understood that there are a plurality of light emitting elements 112 located in the fringe field of view in the display module 11, and the orientations of the plurality of light emitting elements 112 located in the fringe field of view on the substrate 111 may be different, so that the light emitted by the light emitting elements 112 located in different orientations of the fringe field of view can be smoothly emitted into the projecting lens group 12, and the deviation directions of the lens units 1123 of the light emitting elements 112 located in the fringe field of view relative to the light emitting units 1121 may also be different. For example, referring to fig. 3, the two light emitting elements 112 shown in fig. 3 are both located in the peripheral viewing field, but the two light emitting elements 112 are located in different orientations, and the two light emitting elements 112 are respectively disposed at opposite positions on the edge of the substrate 111. In order to make the light emitted from the two light emitting elements 112 incident on the projecting lens group 12, the lens units 1123 of the two light emitting elements 112 are shifted towards the central field of view relative to the light emitting units 1121, in other words, the lens units 1123 of the two light emitting elements 112 are shifted towards the mutual approaching direction relative to the respective light emitting units 1121, so that the two light emitting elements 112 can be symmetrically distributed about the central field of view. The directions of the lens units 1123 in the light emitting elements 112 at other orientations can be derived by referring to the above description, as long as the main light emitting directions of the light emitting elements 112 can be changed and the light emitted by the light emitting elements 112 can be received by the projecting lens group 12.

The specific structural design of the light emitting assembly 112 is not limited, in some embodiments, the surfaces of the light emitting unit 1121 facing the reflective element 113 and the surface of the light emitting unit 1121 facing away from the reflective element 113 are the light emitting surfaces 1122 of the light emitting unit 1121, wherein the light emitted from the light emitting surface 1122 of the light emitting unit 1121 facing away from the reflective element 113 is directly incident on the surface of the lens unit 1123, and the light emitted from the light emitting unit 1121 facing the light emitting surface 1122 of the reflective element 113 can be reflected by the reflective element 113 and then incident on the surface of the lens unit 1123. Therefore, in some embodiments, the orthographic projection of the lens unit 1123 on the reflective element 113 covers the light emitting range of the light emitting unit 1121, for example, the lens unit 1123 covers the light emitting range of the light emitting unit 1121 away from the light emitting surface 1122 of the reflective element 113, and the lens unit 1123 also covers the light reflecting range of the light emitted from the light emitting unit 1121 toward the light emitting surface 1122 of the reflective element 113 and reflected toward the lens unit 1123 by the reflective element 113, so that the lens unit 1123 can receive and project the light emitted from the light emitting unit 1121 to the projection lens group 12 to the maximum extent, and the light emitting efficiency of the light emitting assembly 112 is improved. It is understood that the light emitted from the light emitting unit 1121 can be directly incident on the lens unit 1123 or reflected by the reflective element 113 and then incident on the lens unit 1123, and thus the lens unit 1123 can be regarded as being disposed on the light emitting side of the light emitting unit 1121.

Of course, in the present application, the arrangement of the light emitting assembly 112 is not limited to the above description, in other embodiments, the lens unit 1123 may not be a hemispherical spherical mirror, and the lens unit 1123 of the light emitting assembly 112 may also adopt other arrangement modes to change the outgoing direction of the principal ray of the light emitting assembly 112. For example, in other embodiments, the lens unit 1123 may be an elliptical lens or an aspheric lens, and further, the lens unit 1123 may further include two or more lenses, and the effect of adjusting the light by changing the orientation of the elliptical lens and the position of the elliptical lens relative to the light emitting unit 1121, or changing the curvature and the curvature variation rule of the aspheric lens, or changing the orientations and positions of the lenses relative to each other and the light emitting unit 1121 to adjust different positions of the lens unit 1123 relative to the central axis of the light emitting unit 1121, so as to change the outgoing direction of the principal light of the light emitting assembly 112, and further achieve the effect of reducing at least part of ghost images.

In the present application, the reflective element 113 includes, but is not limited to, a metal or a dielectric material sputtered or evaporated on the substrate 1124, and the light emitting unit 1121 may be a Micro LED chip grown on the reflective element 113.

In some embodiments, the lens unit 1123 is disposed on the reflective element 113 and covers the light emitting unit 1121, i.e. the surface of the light emitting unit 1121 which is in contact with the reflective element 113 is removed, and the remaining surface of the light emitting unit 1121 is covered by the lens unit 1123, so that the lens unit 1123 can both insulate and structurally protect the light emitting unit 1121, and can also effectively project the light emitted by the light emitting unit 1121 toward the projection lens group 12. Of course, in other embodiments, the lens unit 1123 may be disposed at a distance from the reflective element 113 and on a side of the light emitting unit 1121 opposite to the reflective element 113, as long as the orthographic projection of the lens unit 1123 on the reflective element 113 can cover the light emitting range of the light emitting unit 1121.

In the embodiment shown in fig. 3 and fig. 4, the display module 11 may be a Micro LED display screen, all the light emitting elements 112 in the display module 11 may be disposed on the same substrate 111, and all the light emitting elements 112 are arranged in an array on the same surface of the substrate 111.

Of course, the near-eye display device 10 of the present application may also adopt any other suitable type of display module 11. Referring to fig. 13, in some embodiments, the display module 11 of the near-eye display device 10 may be a self-luminous single-panel color Micro-LED Micro-display screen, the display module 11 may include a light combining prism 114, and the light combining prism 114 may be an X-Cube light combining prism. In the present embodiment, the light emitting elements 112 of the display module 11 are all used for emitting monochromatic light in the visible light range, and the display module 11 includes three substrates 111. Wherein a portion of light emitting elements 112 are configured to emit red light, a portion of light emitting elements 112 are configured to emit green light, and a portion of light emitting elements 112 are configured to emit blue light. Further, the light emitting element 112 for emitting red light is provided on one of the substrates 111, and constitutes a red light module 115 with the substrate 111, the light emitting element 112 for emitting green light is provided on the other substrate 111, and constitutes a green light module 116 with the substrate 111, and the light emitting element 112 for emitting blue light is provided on the other substrate 111, and constitutes a blue light module 117 with the substrate 111. The red light module 115, the green light module 116, and the blue light module 117 are respectively disposed on different sides of the light combining prism 114, for example, the red light module 115 and the blue light module 117 are respectively disposed on two opposite sides of the light combining prism 114, and the green light module 116 is disposed on a side of the light combining prism 114 opposite to the projection lens assembly 12.

In the present embodiment, the red light module 115, the green light module 116, and the blue light module 117 all emit light toward the light combining prism 114, and the light emitted by the red light module 115, the green light module 116, and the blue light module 117 is integrated by the light combining prism 114 and then projected onto the projection lens assembly 12, and further projected onto the light guide module 13 by the projection lens assembly 12. It is understood that, in the present embodiment, part of the light emitting elements 112 in the red light module 115, the green light module 116 and the blue light module 117 are located in the central field of view of the display module 11, part of the light emitting elements 112 are located in the quasi-central field of view of the display module 11, and part of the light emitting elements 112 are located in the peripheral field of view of the display module 11, and the structure of the light emitting elements 112 can be the same as that in the embodiment shown in fig. 9. Therefore, the arrangement and arrangement rules of the light emitting elements 112 in the display module 11 can be obtained with reference to fig. 5, fig. 7, fig. 10 and fig. 12, for example, the chief rays emitted from the light emitting elements 112 in the marginal fields of view in the red light module 115, the green light module 116 and the blue light module 117 are all inclined to the central axis of the light emitting surface 1122 of the light emitting element 112, or the chief rays emitted from the light emitting elements 112 in the full fields of view in the red light module 115, the green light module 116 and the blue light module 117 are all inclined to the central axis of the light emitting surface 1122 of the light emitting element 112. Further configurations of the light emitting element 112 in the present embodiment can be derived from the above descriptions, and are not described herein again. Of course, the type of the display module 11 of the near-eye display device 10 is not limited thereto, and any suitable display module 11 capable of satisfying AR or MR imaging may be adopted for the near-eye display device 10 as long as the chief ray emitted from the light emitting component 112 in the display module 11 located in the fringe field of view can be inclined to the central axis of the light emitting surface 1122 of the light emitting component 112 to reduce at least part of ghost images.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (24)

1. A light emitting assembly, comprising:

a substrate;

a light emitting unit disposed on the substrate; and the number of the first and second groups,

the lens unit is arranged on the light emitting side of the light emitting unit, and the optical axis of the lens unit is perpendicular to the central axis of the light emitting unit and deviates from the central axis of the light emitting unit in the direction of the central axis.

2. The lighting assembly of claim 1, wherein an amount of deviation of the optical axis of the lens unit from a central axis of the lighting unit in a direction perpendicular to the central axis is greater than or equal to 2um.

3. The light assembly of claim 2, wherein an amount of deviation of the optical axis of the lens unit from a central axis of the light unit in a direction perpendicular to the central axis is greater than or equal to 4um, and less than or equal to 12um.

4. The light assembly of claim 1, wherein a line connecting a center of a surface of the lens unit facing away from the light unit and a center of a surface of the light unit facing toward the lens unit makes an angle greater than or equal to 5 ° with a central axis of the light unit.

5. The light emitting assembly of claim 1, wherein a line connecting a center of a surface of the lens unit facing away from the light emitting unit and a center of a surface of the light emitting unit facing toward the lens unit forms an included angle with a central axis of the light emitting unit, the included angle being greater than or equal to 10 ° and less than or equal to 30 °.

6. The lighting assembly of claim 1, wherein the lens unit is disposed on a side of the substrate adjacent to the light emitting unit and at least partially covers the light emitting unit.

7. The light-emitting assembly according to claim 1, further comprising a reflective element disposed between the substrate and the light-emitting unit, wherein the light-emitting unit has a light-emitting surface facing the reflective element and a light-emitting surface facing away from the reflective element, and a front projection of the lens unit on the reflective element covers a light-emitting range of the light-emitting unit.

8. The lighting assembly of claim 1, wherein the optical axis of the lens unit is parallel to the central axis of the lighting unit.

9. A display module assembly, has central visual field and marginal visual field, its characterized in that, the display module assembly includes:

a substrate; and (c) a second step of,

and the light-emitting assemblies are arranged on the substrate in an array manner, wherein the edge view field is formed by inclining principal rays emitted by the light-emitting assemblies to the central axis of the light-emitting surfaces of the light-emitting assemblies.

10. The display module of claim 9, wherein an angle between a chief ray emitted from the light emitting element in the peripheral field of view and a central axis of a light emitting surface of the light emitting element is greater than or equal to 5 °.

11. The display module according to claim 10, wherein an included angle between a chief ray emitted from the light emitting element in the peripheral field of view and a central axis of a light emitting surface of the light emitting element is greater than or equal to 10 ° and less than or equal to 30 °.

12. The display module of claim 9, wherein a chief ray emitted from the light emitting element in the central field of view is parallel to a central axis of a light emitting surface of the light emitting element.

13. The display module according to claim 9, wherein an included angle between a principal ray emitted from the light emitting assembly and a central axis of a light emitting surface of the light emitting assembly is gradually increased in a direction in which the central field of view points to the edge field of view.

14. The display module according to claim 13, wherein an included angle between a principal ray emitted from the light emitting element and a central axis of a light emitting surface of the light emitting element is equal to a corresponding field angle of the light emitting element.

15. The display module according to claim 9, wherein the chief rays emitted from the light emitting elements in the full field of view are inclined to the central axis of the light emitting surfaces of the light emitting elements.

16. The display module according to claim 15, wherein the included angle between the principal ray emitted from the light emitting element and the central axis of the light emitting surface of the light emitting element in the full view field range is equal.

17. The display module according to claim 9, wherein the light emitting assembly comprises a substrate, a light emitting unit and a lens unit, the light emitting unit is disposed on the substrate, the lens unit is disposed on a light emitting side of the light emitting unit, wherein an emergent principal ray is inclined from a central axis of a light emitting surface in the light emitting assembly, and an optical axis of the lens unit deviates from the central axis of the light emitting unit in a direction perpendicular to the central axis of the light emitting unit.

18. The display module according to claim 17, wherein the deviation between the optical axis of the lens unit and the central axis of the light emitting unit in a direction perpendicular to the central axis is greater than or equal to 2um.

19. The display module according to claim 18, wherein the deviation between the optical axis of the lens unit and the central axis of the light-emitting unit in the direction perpendicular to the central axis is greater than or equal to 4um and less than or equal to 12um.

20. The display module of claim 17, wherein the lens unit is disposed on the substrate and covers the light emitting unit.

21. The display module according to claim 17, wherein the light-emitting assembly further comprises a reflective element disposed between the substrate and the light-emitting unit, the light-emitting unit has a light-emitting surface facing the reflective element and a light-emitting surface facing away from the reflective element, and an orthographic projection of the lens unit on the reflective element covers a light-emitting range of the light-emitting unit.

22. The display module according to claim 9, further comprising a light-combining prism, wherein a portion of the light-emitting assemblies are configured to emit red light, a portion of the light-emitting assemblies are configured to emit green light, and a portion of the light-emitting assemblies are configured to emit blue light, wherein the light-emitting assemblies configured to emit red light, the light-emitting assemblies configured to emit green light, and the light-emitting assemblies configured to emit blue light are respectively disposed on different sides of the light-combining prism.

23. A near-eye display apparatus comprising a projection lens assembly, a light guide module and the display module according to any one of claims 9-22, wherein the projection lens assembly is disposed between the light guide module and the display module.

24. A near-eye display device as claimed in claim 23 wherein the angle between the chief ray from the light emitting element in the peripheral field of view and the central axis of the light emitting surface of the light emitting element is greater than or equal to half of the light collection angle of the projecting lens group in the corresponding position.

Images