CN114460796B

CN114460796B - Light engine, display device, head-mounted equipment and packaging method of light engine

Info

Publication number: CN114460796B
Application number: CN202111542586.0A
Authority: CN
Inventors: 黄杰峰
Original assignee: Jiangxi Jinghao Optical Co Ltd
Current assignee: Jiangxi Jinghao Optical Co Ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2024-04-12
Anticipated expiration: 2041-12-16
Also published as: CN114460796A

Abstract

The invention discloses a light engine, a display device, a head-mounted device and a packaging method of the light engine. The radiating plate is provided with a mounting surface, the light emitting assembly is arranged on the mounting surface, the light emitting end of the light emitting assembly is not packaged with the protective cover plate, the projection lens comprises a lens barrel and a lens arranged in the lens barrel, the projection lens and the light emitting assembly are integrally packaged, so that the object side end of the lens barrel is packaged and connected with the mounting surface, the lens faces the light emitting end of the light emitting assembly, the lens is used for receiving light rays emitted by the light emitting assembly to form a light engine, the light engine is not packaged with the protective cover plate at the light emitting end of the light emitting assembly, the light engine can not secondarily project the light rays reflected to the light engine, ghost images of images projected by the light engine can be avoided, and the pattern projection quality of the light engine is high.

Description

Light engine, display device, head-mounted equipment and packaging method of light engine

Technical Field

The present invention relates to the field of light emitting technologies, and in particular, to a light engine, a display device, a head-mounted device, and a method for packaging the light engine.

Background

Referring to fig. 1, fig. 1 is a schematic structural diagram of a related art light engine. In a display device such as an AR (Augmented Reality) device, a Light engine 1 (Light engine) needs to be provided for emitting Light, so that an image is projected for display by the display device. In the related art, the light engine 1 is often formed by connecting and packaging the finished light source module 10 and the projection lens 11, and in order to prevent the light emitting element 100 of the finished light source module 10 from being collided or contaminated by impurities after leaving the factory, the light emitting element 100 included in the finished light source module 10 is often covered with a transparent protective cover plate 101. However, since the protection cover 101 reflects the received light, when a portion of the light projected from the light engine 1 is reflected back to the protection cover 101, the protection cover 101 reflects the portion of the light, so that the portion of the light is secondarily projected to the light engine 1, and a ghost image is generated on the image projected from the light engine 1, which affects the image quality of the projection display. However, if the protective cover 101 is directly removed from the light emitting element 100, the light emitting element 100 may be damaged, and the light engine 1 may be damaged and may not be used.

Disclosure of Invention

The embodiment of the invention discloses a light engine, a display device, head-mounted equipment and a packaging method of the light engine.

To achieve the above object, a first aspect of the present invention discloses a light engine comprising:

a heat dissipation plate having a mounting surface;

the light-emitting assembly is arranged on the mounting surface; the method comprises the steps of,

the projection lens comprises a lens barrel and a lens arranged in the lens barrel, the projection lens and the light-emitting assembly are integrally packaged, so that the object side end of the lens barrel is packaged and connected to the mounting surface, a protective cover plate is not arranged between the projection lens and the light-emitting assembly, the lens faces the light-emitting end of the light-emitting assembly, the lens is used for receiving light rays emitted by the light-emitting assembly, the protective cover plate is not arranged at the light-emitting end of the light-emitting assembly, and therefore the light engine cannot secondarily project the light rays reflected to the light engine, ghost images of images projected by the light engine are avoided, and the pattern projection quality of the light engine is high.

As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the light emitting assembly includes a light emitting element and a flexible circuit board, where the flexible circuit board is disposed on the mounting surface, and the light emitting element is electrically connected to the flexible circuit board, so that the light emitting element can be electrically connected to a control circuit outside the light engine through the flexible circuit board;

The luminous piece is arranged on the mounting surface, and the flexible circuit board is positioned on the periphery of the luminous piece, or the luminous piece is arranged on one side, far away from the mounting surface, of the flexible circuit board.

Through making the flexible circuit board be located the periphery of light emitting part for the light emitting part can directly set up in the heating panel, promptly, the light emitting part can directly set up on the installation face, thereby the heating panel is better to the radiating effect of light emitting part, can avoid influencing the luminous precision of light emitting part and even make the light emitting part produce the damage because of operational environment temperature is too high better, in order to guarantee the quality of the pattern that the light emitting part shows and can prolong the life of light emitting part, can make the luminous precision of light emitting engine maintain at higher state.

In an embodiment of the first aspect of the present invention, when the light emitting element is disposed on the mounting surface, a receiving groove is disposed on the mounting surface, and the light emitting element is disposed in the receiving groove, so as to be used for receiving other parts included in the light engine, and can increase a surface area of the heat dissipation plate, thereby improving heat dissipation efficiency of the heat dissipation plate.

The second aspect of the present invention discloses a packaging method of a light engine, the light engine including a heat dissipation plate, a light emitting assembly, and a projection lens, the heat dissipation plate having a mounting surface, the projection lens including a lens barrel and a lens mounted in the lens barrel, the packaging method comprising:

Mounting the light emitting assembly on the mounting surface;

the projection lens and the light-emitting component are integrally packaged, so that the object side end package of the lens barrel is connected to the mounting surface, and the lens is arranged towards the light-emitting component to obtain the light engine;

wherein, the light-emitting end of the light-emitting component is not provided with a protective cover plate.

Therefore, the packaging method of the application eliminates the step of independently packaging the light-emitting component and the protective cover plate in the complete production process of the light engine, namely, simplifies the complete production process of the light engine, also eliminates the use of the protective cover plate, can avoid the situation that the image projected by the light engine generates ghosts due to the protective cover plate, improves the image projection quality of the light engine, and can avoid the situation that light is refracted in the process that the light-emitting end of the self-luminous component emits to the lens of the projection lens, shortens the optical total length of the light engine, enables the light engine to realize more miniaturized design, and meanwhile, does not face the situation that the light-emitting component is damaged for dismantling the protective cover plate, thereby leading to the situation that the light engine cannot be used.

As an alternative implementation manner, in an embodiment of the second aspect of the present invention, the light emitting assembly includes a light emitting member and a flexible circuit board, and the mounting the light emitting assembly on the mounting surface includes:

Mounting the light emitting element and the flexible circuit board on the mounting surface, and enabling the flexible circuit board to be positioned on the periphery of the light emitting element;

and electrically connecting the flexible circuit board with the luminous element.

The luminous piece and the flexible circuit board are directly arranged on the mounting surface, so that the radiating effect of the radiating plate on the luminous piece and the flexible circuit board is better, the luminous precision of the luminous piece is better prevented from being influenced due to overhigh temperature of the working environment, even the luminous piece is damaged, the quality of patterns displayed by the luminous piece is ensured, and the service life of the luminous piece can be prolonged.

As an alternative embodiment, in an embodiment of the second aspect of the present invention, a receiving groove is provided on the mounting surface, and the light emitting element is disposed in the receiving groove.

Thereby luminous piece and holistic thickness of heating panel are littleer to make the light engine can further realize miniaturized design, simultaneously, luminous piece can also dispel the heat through the cell wall of holding groove, and the effective radiating area between heating panel and the luminous piece is bigger, and luminous piece's radiating efficiency is higher.

A third aspect of the present invention discloses a display device, which includes an optical waveguide module and the light engine according to the first aspect, where the optical waveguide module is configured to receive light passing through the projection lens, and conduct and emit the light.

The light engine provided by the first aspect of the present invention has high projected image quality, small total light length, and further compact design, so that the display device has high image display quality and a lighter and thinner structure.

In an embodiment of the third aspect of the present invention, the number of the light engines is plural, and the heat dissipation plates of at least two of the light engines are integrally connected, so that the at least two light emitting members are formed into a unitary structure by the integral heat dissipation plate, so that the number of parts of the display device can be reduced, and the assembly steps of the display device can be reduced.

As an optional implementation manner, in the embodiment of the third aspect of the present invention, the number of the light engines is multiple, and the multiple light engines are arranged in a ring shape, so that the multiple light engines are more compact, and the structure of the display device is more compact and reasonable, and a miniaturized design can be realized.

A fourth aspect of the invention discloses a head-mounted device comprising a display device as described in the third aspect above. Through using the display device that this application third aspect disclosed, can promote the AR display quality of head-mounted device, can also make head-mounted device's structure compacter, reasonable to can realize head-mounted device's miniaturized design, head-mounted device's performance is good, uses the convenience height.

Compared with the prior art, the invention has the beneficial effects that:

according to the light engine provided by the embodiment of the invention, the finished light source module is not used, the light emitting assembly is arranged on the mounting surface of the heat radiating plate, the lens barrel of the projection lens is connected to the mounting surface, the lens of the projection lens faces the light emitting assembly and is used for receiving light rays emitted by the light emitting assembly, so that the light engine is formed, the light emitting end of the light emitting assembly is not provided with the protective cover plate, the light engine can not carry out secondary projection on the light rays reflected to the light engine, ghost images are prevented from being generated by images projected by the light engine, and the pattern projection quality of the light engine is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a related art light engine;

FIG. 2 is a schematic diagram of the structure of a light engine disclosed in the first aspect of the embodiment of the present application;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is a schematic diagram showing a comparison of the structure of a related art light engine and the light engine disclosed in the first aspect of the embodiments of the present application;

fig. 5 is a schematic structural diagram of a heat dissipating plate and a light emitting assembly according to a first aspect of the present disclosure;

FIG. 6 is a flow chart of a method of packaging a light engine disclosed in a second aspect of an embodiment of the present application;

FIG. 7 is a schematic illustration of a packaging process of a method of packaging a light engine disclosed in a second aspect of an embodiment of the present application;

fig. 8 is a schematic structural view of a display device disclosed in a third aspect of an embodiment of the present application;

fig. 9 is a schematic exploded view of a display device disclosed in a third aspect of the embodiment of the present application;

FIG. 10 is a cross-sectional view taken along the direction B-B in FIG. 8;

fig. 11 is another structural exploded schematic view of a display device disclosed in a third aspect of the embodiment of the present application;

FIG. 12 is a cross-sectional view of an optical waveguide module disclosed in a third aspect of an embodiment of the present application;

FIG. 13 is a schematic view of optical waveguide module according to a third aspect of the embodiments of the present application;

fig. 14 is a schematic block diagram of a headset device disclosed in the fourth aspect of the embodiment of the present application.

Icon: 1. a light engine; 10. a finished light source module; 100. a light emitting member; 101. a protective cover plate; 11. a projection lens; 2. a light engine; 20. a heat dissipation plate; 200. a mounting surface; 201. a receiving groove; 21. a light emitting assembly; 210. a light emitting member; 211. a flexible circuit board; 22. a projection lens; 220. a lens barrel; 221. a lens; 3. a display device; 30. an optical waveguide module; 300. an incidence part; 300a, an incident groove; 300b, incident gratings; 301. an injection part; 301a, an exit grating; 31. a bracket; 310. a carrying part; 310a, a first mounting cavity; 311. a mounting part; 311a, a second mounting cavity; 32. a waveguide sheet; 320. a first waveguide sheet; 320a, an incident through hole; 321. a second waveguide sheet; 4. a human eye; 5. a head-mounted device.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The technical scheme of the invention will be further described with reference to the examples and the accompanying drawings.

Referring to fig. 2 and 3 together, fig. 2 is a schematic structural diagram of a light engine according to a first aspect of an embodiment of the present application, and fig. 3 is a cross-sectional view along A-A in fig. 2, in which an embodiment of the first aspect of the present invention discloses a light engine 2, and the light engine 2 can be applied to a display device and used as a light source of the display device. The display device may be applied to a head-mounted device, for example, AR glasses, so that a user can view an image. Specifically, the light engine 2 includes a heat dissipation plate 20, a light emitting assembly 21, and a projection lens 22. The heat dissipation plate 20 has a mounting surface 200, the light emitting component 21 is disposed on the mounting surface 200, the projection lens 22 includes a lens barrel 220 and a lens 221 mounted in the lens barrel 220, the projection lens 22 and the light emitting component 21 are integrally packaged, so that an object side end of the lens barrel 220 is packaged and connected to the mounting surface 200, no protective cover plate is disposed between the projection lens 22 and the light emitting component 21, the lens 221 is disposed towards a light emitting end of the light emitting component 21, and the lens 221 is used for receiving light emitted by the light emitting component 21.

It should be noted that, the object side end of the lens barrel 220 refers to the object side end of the projection lens 22, that is, the end of the projection lens 22 for receiving the light emitted from the light emitting assembly 21. The protective cover plate means a protective cover plate which is additionally provided in addition to a protective member (e.g., a globe covering the outer periphery of the light-emitting wick) which is necessarily provided in the structure of the light-emitting module 21. The light emitting end of the light emitting element 21 refers to an end of the light emitting element 21 for emitting light, and it is understood that the light emitted from the light emitting element 21 is transmitted from the light emitting end of the light emitting element 21 to the outside of the light emitting element 21.

In addition, the foregoing "the projection lens 22 is integrally packaged with the light emitting assembly 21" means that the light emitting assembly 21, which is not capable of being transported and used by the projection lens 22, is packaged as one body, so that the whole of the light emitting assembly 21 and the projection lens 22 can be transported and used separately. In other words, in the packaging process of the light emitting assembly 21 provided in the present application, the projection lens 22 is used instead of the protective cover plate used in the related art to be packaged with the light emitting assembly 21, thereby completing the packaging process of the light emitting assembly 21.

In the light engine 2 provided by the embodiment of the invention, a finished light source module is not used, but the light emitting component 21 is arranged on the mounting surface 200 of the heat dissipation plate 20, the lens 220 of the projection lens 22 is connected to the mounting surface 200, the lens 221 of the projection lens 22 faces to the light emitting component 21 and is used for receiving the light emitted by the light emitting component 21, so that the light engine 2 is formed, the light emitting end of the light emitting component 210 is not provided with the protective cover plate, the light engine 2 does not secondarily project the light reflected to the light engine 2, the ghost image generated by the image projected by the light engine 2 is avoided, and the pattern projection quality of the light engine 2 is high.

Further, since the material of the protective cover plate is different from that of air, light rays are refracted when emitted from the air into the protective cover plate and emitted from the interior of the protective cover plate to the air, so that the total optical length of the light engine is affected. Specifically, as shown in fig. 4, fig. 4 is a schematic diagram comparing the structure of the light engine 1 in the related art with that of the light engine 2 disclosed in the first aspect of the embodiment of the present application, and further, since the light engine 2 omits the protection cover plate, the light emitted by the light emitting component 21 can be directly emitted to the projection lens 22, that is, the light does not need to be refracted at the protection cover plate and then emitted to the projection lens 22, so that the optical overall length of the light engine 2 can be reduced, and the light engine 2 can be designed to be miniaturized. As shown in fig. 4, fig. 4 (a) shows that the light emitted from the light emitting element 100 of the light engine 1 in the related art is directed to the protective cover plate 101, refracted by the protective cover plate 101, and directed to the projection lens 11 to be collimated and emitted by the projection lens 11, fig. 4 (b) shows that the light emitted from the light emitting element 210 of the light engine 2 provided in the present application is directed to the projection lens 22, and it is easy to see that the optical total length L1 of the light engine 1 in the related art is longer than the optical total length L2 of the light engine 2 provided in the present invention, wherein, in order to distinguish the light emitted from three different positions of the light emitting element 210, fig. 4 (a) and (b) show the optical paths of the light emitted from three different positions in different line shapes, respectively. For example, the arrowed dot-dash line in fig. 4 (a) represents the light emitted from the edge of the light emitting element 210, while the arrowed dotted line represents the light emitted from the position between the edge and the center of the light emitting element 210, and the arrowed solid line represents the light emitted from the center of the light emitting element 210. It is to be understood that the above light is merely an example for easy understanding, and does not limit the scope of the present embodiment.

It can be understood that, considering the light engine 2 of the present application as a light source applied to a display device of a head-mounted device, when the light engine 2 is provided, the volume of the light engine 2 needs to be considered, so that the miniaturization and light weight design of the display device and even the head-mounted device can be realized, and the wearing experience of a user can be improved. Based on this, in the light engine 2 of the present application, the design of the protective cover 101 is canceled, so that not only the situation that the light is reflected by the protective cover 101 to generate secondary projection to cause the ghost image of the final image can be avoided, but also the refraction of the light when passing through the protective cover 101 can be avoided, so as to reduce the total optical length of the light engine 2, thereby reducing the total length and weight of the light engine 2, and enabling the light engine 2 to realize a miniaturized and lightweight design.

Referring to fig. 3 again, in some embodiments, the light emitting assembly 21 includes a light emitting element 210 and a flexible circuit board 211, the light emitting element 210 is disposed on the heat dissipation plate 20, the flexible circuit board 211 is disposed on the mounting surface 200, and the light emitting element 210 is electrically connected to the flexible circuit board 211, so that the light emitting element 210 can be electrically connected to a control circuit outside the light engine 2 through the flexible circuit board 211.

Further, the light emitting element 210 is disposed on the mounting surface 200, the flexible circuit board 211 is disposed on the outer periphery of the light emitting element 210, and by making the flexible circuit board 211 disposed on the outer periphery of the light emitting element 210, the light emitting element 210 can be directly disposed on the heat dissipation plate 20, that is, the light emitting element 210 can be directly disposed on the mounting surface 200, so that the heat dissipation effect of the heat dissipation plate 20 on the light emitting element 210 is better, the light emitting precision of the light emitting element 210 can be better prevented from being influenced due to the too high working environment temperature, even the light emitting element 210 is damaged, the quality of the pattern displayed by the light emitting element 210 is ensured, the service life of the light emitting element 210 can be prolonged, and the light emitting precision of the light emitting engine 2 can be maintained in a higher state.

Alternatively, the flexible circuit board 211 may be located at one side of the light emitting element 210, or the flexible circuit board 211 may be disposed around the outer circumference of the light emitting element 210, so that the area of the flexible circuit board 211 is larger and can be used to dispose more electronic components or circuits.

Since the flexible circuit board 211 is located at the outer circumference of the light emitting member 210, the flexible circuit board 211 and the light emitting member 210 may be electrically connected by wire bonding.

It can be appreciated that in other embodiments, the light emitting element 210 may also be disposed on the flexible circuit board 211, so that the light emitting element 210 is connected to the heat dissipation plate 20 through the flexible circuit board 211, so that the light emitting element 210 can be directly and electrically connected to the flexible circuit board 211, and the assembly process of the light emitting element 210 and the flexible circuit board 211 is simple. Alternatively, the light emitting element 210 may be disposed on the flexible circuit board 211 by gluing, so that the light emitting element 210 is firmly connected with the flexible circuit board 211, and meanwhile, the gap between the light emitting element 210 and the flexible circuit board 211 is smaller, so that the thickness of the light emitting element 210 and the flexible circuit board 211 is smaller, and the structure of the light emitting assembly 21 is lighter and thinner.

Alternatively, the light emitting element 210 may be a Micro-LED (Micro-Light Emitting Diode, micro light emitting diode) panel, so that the light emitting element 210 may be used to emit different light for displaying different color patterns, and the light emitting element 210 may be smaller, so as to achieve a miniaturized design of the light engine 2.

It can be understood that when the light emitting element 210 emits light, the light emitting element 210 can be regarded as a combination of a plurality of point light sources, so that the light path directions of the light rays emitted by the light emitting element 210 are disordered, and the light emitting element is not suitable for being projected to form a projection image. Based on this, the projection lens 22 optionally includes a lens 221 for receiving the light emitted from the light emitting element 210 and collimating the light to be projected to form a projection image.

Optionally, the heat dissipation plate 20 may be a thin plate structure made of materials with higher hardness and higher heat conduction efficiency, such as steel, ceramic, etc., so that the heat dissipation plate 20 can be used to accelerate the heat dissipation efficiency of the light emitting element 210, thereby avoiding influencing the light emitting precision of the light emitting element 210 and even damaging the light emitting element 210 due to the too high temperature of the working environment, ensuring the quality of the pattern displayed by the light emitting element 210 and prolonging the service life of the light emitting element 210, and making the structural strength of the heat dissipation plate 20 larger, so that the heat dissipation plate 20 can also realize the function of reinforcing the structures of the light emitting element 210 and at least part of the flexible circuit board 211, so as to protect the structures of the light emitting element 210 and at least part of the flexible circuit board 211.

Referring to fig. 5, in some embodiments, a receiving groove 201 may be disposed on the mounting surface 200 of the heat dissipation plate 20, so as to be used for receiving other components included in the light engine 2, and to increase the surface area of the heat dissipation plate 20, thereby improving the heat dissipation efficiency of the heat dissipation plate 20. Specifically, when the light emitting member 210 is disposed on the mounting surface 200, the light emitting member 210 is at least partially disposed in the accommodating groove 201, for example, the light emitting member may be partially disposed in the accommodating groove 201 and connected to a groove bottom of the accommodating groove 201, or may be partially disposed in the accommodating groove 201 and connected to a groove side wall of the accommodating groove 201, or the light emitting member may be completely disposed in the accommodating groove 201 and connected to a groove bottom of the accommodating groove 201, or may be completely disposed in the accommodating groove 201 and connected to a groove side wall of the accommodating groove 201, so that the thickness of the light emitting member 210 and the entire heat dissipation plate 20 is smaller, so that the light engine 2 can further achieve a miniaturized design, and meanwhile, the light emitting member 210 can also dissipate heat through the groove wall of the accommodating groove 201, so that an effective heat dissipation area between the heat dissipation plate 20 and the light emitting member 210 is larger, and a heat dissipation efficiency of the light emitting member 210 is higher.

Referring to fig. 6 and 7 together, a second aspect of the embodiments of the present application discloses a packaging method of a light engine, wherein the packaging method mainly packages the light engine 2 mentioned in the first aspect, the light engine 2 includes a heat dissipation plate 20, a light emitting component 21 and a projection lens 22, the heat dissipation plate 20 has a mounting surface 200, and the projection lens 22 includes a lens barrel 220 and a lens 221 mounted in the lens barrel 220. Specifically, the packaging method comprises the following steps:

s1, mounting the light-emitting component on a mounting surface.

So that the heat transfer efficiency between the light emitting assembly 21 and the mounting surface 200 is high, the heat dissipation effect of the heat dissipation plate 20 on the light emitting assembly 21 is good, and the heat dissipation plate 20 can reinforce at least part of the structure of the light emitting assembly 21 to protect the light emitting assembly 21.

As shown in fig. 7 (a), fig. 7 (a) shows the heat dissipation plate 20. Optionally, the heat dissipation plate 20 may be a thin plate structure made of materials with higher hardness and higher heat conduction efficiency, such as steel, ceramic, etc., so that the heat dissipation plate 20 can be used to accelerate the heat dissipation efficiency of the light emitting component 21 while ensuring the strength of the heat dissipation plate 20, so as to avoid influencing the light emitting precision of the light emitting component 21 and even damaging the light emitting component 21 due to the too high working environment temperature, so as to ensure the quality of the pattern displayed by the light emitting component 21 and prolong the service life of the light emitting component 21.

As shown in fig. 5, optionally, the light emitting assembly 21 may include a light emitting element 210 and a flexible circuit board 211, and specifically, step S1 may include:

s10, mounting the luminous element and the flexible circuit board on the mounting surface, and enabling the flexible circuit board to be located on the periphery of the luminous element.

The light-emitting piece 210 and the flexible circuit board 211 are directly arranged on the mounting surface 200, so that the heat dissipation effect of the heat dissipation plate 20 on the light-emitting piece 210 and the flexible circuit board 211 is better, the light-emitting precision of the light-emitting piece 210 is better prevented from being influenced due to the too high working environment temperature, even the light-emitting piece 210 is damaged, the quality of patterns displayed by the light-emitting piece 210 is ensured, and the service life of the light-emitting piece 210 is prolonged.

Optionally, the light emitting element 210 may be disposed on the mounting surface 200 by gluing, so that the light emitting element 210 is firmly connected with the mounting surface 200, and meanwhile, a gap between the light emitting element 210 and the mounting surface 200 is smaller, so as to ensure that the heat transfer efficiency between the light emitting element 210 and the heat dissipation plate 20 is higher, thereby the heat dissipation function of the light emitting element 210 can be better implemented by the heat dissipation plate 20.

In some embodiments, the mounting surface 200 of the heat dissipation plate 20 may be provided with a receiving groove 201 for receiving other components included in the light engine 2, and the surface area of the heat dissipation plate 20 may be increased, so as to improve the heat dissipation efficiency of the heat dissipation plate 20.

Specifically, step S10 may include:

s100, arranging the luminous element at the bottom of the accommodating groove.

Therefore, the thickness of the whole light emitting part 210 and the heat dissipation plate 20 is smaller, so that the light engine 2 can further achieve a miniaturized design, meanwhile, the light emitting part 210 can also dissipate heat through the wall of the accommodating groove 201, the effective heat dissipation area between the heat dissipation plate 20 and the light emitting part 210 is larger, and the heat dissipation efficiency of the light emitting part 210 is higher.

S101, arranging the flexible circuit board on the mounting surface, and enabling the flexible circuit board to be located on the periphery of the luminous piece.

By positioning the flexible circuit board 211 on the outer periphery of the light emitting element 210, the flexible circuit board 211 does not interfere with the light emitting element 210, so that the flexible circuit board 211 does not affect the direct connection between the light emitting element 210 and the heat dissipating plate 20, and does not block the light emitting element 210 from emitting light in a direction away from the heat dissipating plate 20, as shown in fig. 5 and fig. 7 (c), fig. 5 and fig. 7 (c) each show that the flexible circuit board 211 is disposed on the mounting surface 200, and the flexible circuit board 211 is positioned on the outer periphery of the light emitting element 210.

Specifically, only the pad portion of the flexible circuit board 211 for electrical connection with the light emitting member 210 may be provided to the mounting surface 200 so that the relative positions of the pad of the flexible circuit board 211 and the light emitting member 210 are fixed.

After step S10, step S1 further includes:

s11, electrically connecting the flexible circuit board with the luminous element.

As described above, in some embodiments, the flexible circuit board 211 is located at the outer periphery of the light emitting element 210, i.e., the flexible circuit board 211 is not directly connected to the light emitting element 210, and thus, the flexible circuit board 211 cannot be directly electrically connected to the light emitting element 210. Based on this, the flexible circuit board 211 may be alternatively electrically connected to the light emitting member 210 by wire bonding, as shown in fig. 5, and fig. 5 shows that the flexible circuit board 211 is electrically connected to the light emitting member 210 by wire bonding.

Further, in order to make the electrical connection structure between the flexible circuit board 211 and the light emitting element 210 more stable, a packaging adhesive may be further coated at the position where the flexible circuit board 211 and the light emitting element 210 are wire-bonded.

Referring to fig. 6 and fig. 7 again, after step S11, the packaging method of the display device 2 further includes:

s2, integrally packaging the projection lens and the light-emitting component, so that the object side end package of the lens barrel is connected to the mounting surface, and the lens is arranged towards the light-emitting component to obtain a light engine;

As shown in fig. 7 (d), fig. 7 (d) shows that the object side end package of the lens barrel 220 is connected to the mounting surface 200, and the lens 221 is disposed toward the light emitting assembly 21, and the light emitting end of the light emitting assembly 21 is not provided with a protective cover plate.

Optionally, the object side end of the lens barrel 220 may be sealed and connected to the mounting surface 200 by means of gluing, so that the projection lens 22 and the heat dissipation plate 20 are fixed, and meanwhile, a connection gap between the lens barrel 220 and the mounting surface 200 can be eliminated, so that impurities are prevented from entering between the lens 221 and the light emitting element 210 from the connection gap between the lens barrel 220 and the mounting surface 200, and a shadow generated by interference of impurities in the process of projecting light rays emitted by the light emitting element 210 to the lens 221 can be avoided, so that the quality of images projected by the light engine 2 is improved.

Since the related art uses the finished light source module, the factory for producing the packaged light engine includes only the process of packaging and connecting the projection lens and the finished light source module. It can be appreciated that after the finished light source module is produced, the finished light source module needs to be transported to be packaged with the projection lens through transportation, and is difficult to avoid, and the finished light source module is separated from a clean environment in the transportation process, so that the finished light source module must be packaged with a protection cover plate at the light emitting end of the light emitting component so as to avoid pollution of the light emitting component in the transportation process.

In the packaging method of the light engine 2, the projection lens 22 is directly packaged integrally with the light-emitting component 21, namely, when the light-emitting component is packaged, the projection lens and the light-emitting component are packaged integrally, so that a protective cover plate is not required to be arranged, and the transferring step of the light-emitting component 21 is also omitted, and the light-emitting component 21 is prevented from being separated from a clean environment. In other words, the process of integrally packaging the projection lens 22 and the light emitting component 21 directly replaces the process of packaging the protective cover plate at the light emitting end of the light emitting component in the related art, so that the projection lens 22 can realize the functions of receiving the light emitted by the light emitting component 21 and collimating and emitting the light, and meanwhile can also realize the effect of protecting the light emitting component 21 and avoiding dust from adhering to the light emitting end of the light emitting component 21.

Therefore, the packaging method of the light engine 2 provided by the application eliminates the step of independently packaging the light-emitting component and the protective cover plate in the complete production process of the light engine 2, namely, simplifies the complete production process of the light engine 2, and also eliminates the use of the protective cover plate, so that the situation that the image projected by the light engine 2 generates ghosts due to the protective cover plate can be avoided, the image projection quality of the light engine 2 is improved, the situation that light is refracted in the process that the light emitting end of the self-luminous component 21 emits light to the lens 221 of the projection lens 22 can be avoided, the optical total length of the light engine 2 is shortened, the light engine 2 can be designed to be miniaturized more, and meanwhile, the situation that the light-emitting component 21 is damaged and the light engine cannot be used due to the removal of the protective cover plate is avoided.

Referring to fig. 8 to 10 together, fig. 8 is a schematic structural diagram of a display device disclosed in a third aspect of an embodiment of the present application, fig. 9 is an exploded structural diagram of a display device disclosed in the third aspect of an embodiment of the present application, fig. 10 is a cross-sectional view along the direction B-B in fig. 8, and a third aspect of an embodiment of the present invention discloses a display device 3, where the display device 3 may be applied to an electronic apparatus for displaying an image, for example, the display device 3 may be applied to a head-mounted apparatus, such as AR (Augmented Reality ) glasses, for displaying an image on a lens 221 of the head-mounted apparatus for viewing by a user wearing the head-mounted apparatus. The display device 3 includes the light engine 2 as described in the first aspect and the light waveguide module 30, where the light waveguide module 30 is configured to receive the light beam projected by the light engine 2, conduct and emit the light beam, and thereby implement the projection display of the pattern emitted by the light emitting element 210 when the light beam is emitted.

Since the light engine 2 according to the first aspect of the present embodiment has high projected image quality and small total light length, the light engine can be further miniaturized, and thus the display device 3 has high image display quality and a lighter and thinner structure.

In some embodiments, the display device 3 may include one or more light engines 2. In an alternative embodiment, the display device 3 comprises one light engine 2, and the display device 3 is arranged to display the pattern projected by the one light engine 2.

In another alternative embodiment, the display device 3 comprises a plurality of light engines 2, and the display device 3 is configured to fuse the patterns projected by the plurality of light engines 2 and display the fused patterns, thereby enabling the display device 3 to be used to display richer patterns. Referring to fig. 11, for example, the display device 3 includes three light engines 2, and the three light engines 2 are respectively used for projecting patterns of three primary colors (i.e. red, green and blue) of light, and then the three patterns are conducted and fused into one pattern by the optical waveguide module 30 to project a color fused pattern. The display device 3 may be used to sequentially display the patterns projected by the plurality of light engines 2 by stacking the patterns, thereby realizing a stereoscopic pattern display function.

Further, it is considered that the light engine 2 is plural, and thus, the plural light engines 2 may be arranged in a ring shape or a straight line shape. In order to make the plurality of light engines 2 more compact and thus the structure of the display device 3 more compact and rational, a compact design can be realized, and the plurality of light engines 2 may be arranged in a ring shape. For example, when the number of the light engines 2 is three, the three light engines 2 may be arranged in a triangle shape, so that the three light engines 2 are arranged more compactly, thereby making the structure of the display device 3 more compact, which is advantageous for the miniaturization design of the display device 3. Of course, when there are more light engines 2, the more light engines 2 may be arranged in a ring shape such as a quadrangle, a pentagon, a circle, or the like.

It will be appreciated that each light engine 2 includes a heat sink 20. In an alternative example, the heat dissipation plates 20 included in each light engine 2 are separately arranged, so that the relative positions of the light engines 2 are flexibly adjustable, and in the assembly process of the display device 3, active alignment of the light engines 2 and the optical waveguide module 30 can be realized, so that the display effect of the display device 3 is further improved.

In another alternative example, the heat dissipation plates 20 included in at least two light engines 2 may be connected to form a single body, so that by forming the at least two light emitting members 210 as a single body structure through the single body heat dissipation plate 20, the number of parts of the display device 3 can be reduced to reduce the number of assembling steps of the display device 3, as shown in fig. 11, in which three heat dissipation plates 20 included in the light engines 2 are connected to form a single body, as shown in fig. 11.

As shown in fig. 12, when the display device 3 includes a plurality of light engines 2, a plurality of light beams emitted from the light engines 2 can be received by the light waveguide module 30, and the plurality of light beams are transmitted and combined to be emitted, so that the light waveguide module 30 may include an incident portion 300 and an emitting portion 301 connected to the incident portion 300. An incident groove 300a is formed in one side of the incident portion 300 facing the projection lens 22, an incident grating 300b is formed in one side of the incident portion 300 facing away from the projection lens 22, the incident grating 300b is arranged corresponding to the incident groove 300a, and an emergent grating 301a is formed in one side of the emergent portion 301 facing away from the projection lens 22. The incident groove 300a is used for allowing each light collimated by the plurality of projection lenses 22 to enter the interior of the incident portion 300 and diffract through the incident grating 300b, the light diffracted by the incident grating 300b is transmitted to the emergent grating 301a through the interior of the optical waveguide module 30, and the emergent grating 301a is used for emergent light, so that the functions of conducting and converging different light to be emergent to the human eye 4 are achieved. As shown in fig. 12 (a), fig. 12 (a) shows three different light rays entering the inside of the incident part 300 from the incident groove 300a and diffracting at the incident grating 300b to be respectively conducted to the inside of the optical waveguide module 30 at the incident groove 300a and converged to exit, wherein in order to distinguish the three different light rays, fig. 12 (a) shows the light paths of the three different light rays respectively in different line shapes. For example, the arrowed dotted line of (a) in fig. 12 represents red light, while the arrowed dash-dot line represents blue light, and the arrowed implementation represents green light. It is to be understood that the above light is merely an example for easy understanding, and does not limit the scope of the present embodiment.

Further, the optical waveguide module 30 may be a single-layer waveguide sheet, so that different light rays are conducted in the same waveguide sheet, or the optical waveguide module 30 may include multiple layers of waveguide sheets 32, and the multiple layers of waveguide sheets 32 may be sequentially stacked to separate different light rays into different waveguide sheets 32 for conducting, so as to avoid interference between different light rays in the conducting process, and improve the display effect of the display device 3.

As shown in (b) and (c) in fig. 12, the optical waveguide module 30 may include multiple layers of waveguide sheets 32, where the multiple layers of waveguide sheets 32 are sequentially stacked along the incident direction Q of the light, each waveguide sheet 32 includes an incident portion 300 and an emitting portion 301 connected to the incident portion 300, the incident portion 300 of each layer of waveguide sheet 32 is provided with the incident grating 300b, the emitting portion 301 of each layer of waveguide sheet 32 is provided with the emitting grating 301a, and the emitting gratings 301a on each layer of waveguide sheet 32 are correspondingly disposed, so that the optical waveguide module 30 can transmit different light through each waveguide sheet 32, avoid interference between different light during the transmission process, and thus alleviate the phenomenon that different light changes during the transmission process, and further improve the clarity of the color picture displayed by the display device 3, as shown in fig. 12, the arrow in fig. 12 shows the incident direction Q of the light.

Further, in order to achieve the transmission of different light rays through the waveguide plates 32, it is necessary to distinguish the light rays after they enter the optical waveguide module 30. For convenience of description, it is defined that each two adjacent waveguide sheets 32 of the plurality of waveguide sheets 32, wherein one waveguide sheet 32 is a first waveguide sheet 320, and the other waveguide sheet 32 is a second waveguide sheet 321, and the second waveguide sheet 321 is stacked on the first waveguide sheet 320 along the incident direction Q of the light, so that the light required to be conducted through the second waveguide sheet 321 must first pass through the first waveguide sheet 320 before being directed to the second waveguide sheet 321, and therefore, when various light is required to be injected into the interior of the first waveguide sheet 320, the light required to be conducted through the first waveguide sheet 320 is left in the interior of the first waveguide sheet 320, and the light required to be conducted through the second waveguide sheet 321 is emitted from the interior of the first waveguide sheet 320 to enter the interior of the second waveguide sheet 321.

It can be seen that when the waveguide sheet 32 is a plurality of layers, the number of layers of the waveguide sheet 32 can be set according to the number of types of light to be transmitted, for example, when the light to be transmitted is two different light, the waveguide sheet 32 can be two layers, and when the light to be transmitted is three different light, the waveguide sheet 32 can be three layers, and so on.

It will be appreciated that the incidence grating 300b may be used to diffract a particular light ray so that the particular light ray is conducted inside the waveguide sheet 32 including the incidence grating 300b, while the remaining portion of the light ray may pass through the incidence grating 300b and be directed outside the waveguide sheet 32. Based on this, the position of the incident grating 300b on each layer of waveguide sheet 32 can be designed to achieve the effect of enabling each layer of waveguide sheet 32 to conduct different light rays respectively.

As shown in fig. 12 (b), in an alternative embodiment, the function of conducting different light rays through the waveguide plates 32 may be achieved by allowing the incident gratings 300b to diffract different light rays and allow light rays other than the corresponding light rays to pass through to distinguish the light rays. Specifically, the projection of the incident grating 300b on the second waveguide plate 321 on the first waveguide plate 320 is located within the range of the incident grating 300b on the first waveguide plate 320, so that when the light required to be transmitted through the second waveguide plate 321 is incident on the first waveguide plate 320, the light can be directed to the incident grating 300b included in the first waveguide plate 320, and the incident grating 300b can be used for diffracting the light transmitted in the first waveguide plate 320 and can be used for transmitting the light transmitted in the second waveguide plate 321, so that the light used for transmitting the light in the second waveguide plate 321 can pass through the first waveguide plate 320 to be incident on the second waveguide plate 321, thereby realizing the function of distinguishing different light to transmit different light through each waveguide plate 32.

For example, as shown in fig. 12 (b), the light is three types of light, for example, red light, blue light, and green light, the waveguide sheet 32 is correspondingly three layers, and the three waveguide sheets 32 are sequentially a first waveguide sheet 32a, a second waveguide sheet 32b, and a third waveguide sheet 32c along the incident direction Q of the light, so that the projection of the incident grating 300b on the third waveguide sheet 32c on the second waveguide sheet 32b is located in the range of the incident grating 300b on the second waveguide sheet 32b, and the projection of the incident grating 300b on the second waveguide sheet 32b on the first waveguide sheet 32a is located in the range of the incident grating 300b on the first waveguide sheet 32 a. It can be seen that, for waveguide sheet No. three 32c, the projection of the incident grating 300b thereon onto waveguide sheet No. one 32a is also within the range of the incident grating 300b on waveguide sheet No. one 32 a.

Further, the incident groove 300a on the third waveguide sheet 32c is disposed corresponding to the incident grating 300b on the third waveguide sheet 32c, the incident groove 300a on the second waveguide sheet 32b is disposed corresponding to the incident grating 300b on the second waveguide sheet 32b, the incident groove 300a on the first waveguide sheet 32a is disposed corresponding to the incident grating 300b on the first waveguide sheet 32a, that is, the range of the incident groove 300a on the first waveguide sheet 32a is to cover the position of the incident grating 300b on the first waveguide sheet 32a, the range of the incident groove 300a on the second waveguide sheet 32b is to cover the position of the incident grating 300b on the second waveguide sheet 32b, and the range of the incident groove 300a on the third waveguide sheet 32c is to cover the position of the incident grating 300b on the third waveguide sheet 32 c.

In another alternative embodiment, as shown in fig. 12 (c), different light beams are projected onto the optical waveguide module 30 through the projection lenses 22, that is, the incident positions of the different light beams on the optical waveguide module 30 are different, and based on this, the incident gratings 300b on each layer of waveguide plates 32 may be staggered, so that the incident gratings 300b are respectively disposed corresponding to the incident positions of the different light beams, so as to diffract the different light beams, and enable the different light beams to be respectively conducted in the waveguide plates 32. It is understood that the incident positions of the portions of the waveguide sheet 32 corresponding to other light rays may be formed to allow all the light rays to pass through, for example, the incident through holes 320a may be provided, or may be formed to have a physical structure with extremely high transmittance for allowing other light rays to pass through.

As shown in fig. 13, in this embodiment, the first waveguide sheet 320 is provided with the incident through hole 320a, and the projection of the incident grating 300b on the second waveguide sheet 321 on the first waveguide sheet 320 is located within the range of the incident through hole 320a, so that the light beam used for conducting in the second waveguide sheet 321 can pass through the incident through hole 320a before going to the incident grating 300b included in the second waveguide sheet 321, so as to pass through the first waveguide sheet 320, and directly go to the incident grating 300b, so as to conduct in the second waveguide sheet 321, and by setting the incident through hole 320a to avoid the incident path of other light beams, the loss of other light beams when passing through the non-corresponding waveguide sheet 32 can be reduced, so that the image projection quality of the display device 3 can be further improved. Wherein, fig. 13 shows the light paths in which three different light rays are conducted in the optical waveguide module 30 structure shown in (c) of fig. 12, and part of reference numerals are omitted in fig. 13 for convenience of viewing.

Specifically, fig. 13 shows that the waveguide sheet 32 is three layers, and the three waveguide sheets 32 are the first waveguide sheet 32a, the second waveguide sheet 32b and the third waveguide sheet 32c in this order, the first waveguide sheet 32a and the second waveguide sheet 32b are each provided with the incident through hole 320a, the third waveguide sheet 32c is not provided with the incident through hole 320a, and the projection of the incident through hole 320a on the second waveguide sheet 32b onto the first waveguide sheet 32a is located within the range of the incident through hole 320a on the first waveguide sheet 32a, that is, the range of the incident through hole 320a on the first waveguide sheet 32a is to cover the positions of the incident through hole 320a and the incident grating 300b on the second waveguide sheet 32b, and the corresponding range of the incident through hole 320a on the second waveguide sheet 32b is to cover the positions of the incident grating 300b of the third waveguide sheet 32 c.

Further, the incident groove 300a on the first waveguide sheet 32a is disposed corresponding to the incident grating 300b on the first waveguide sheet 32a, the incident groove 300a on the second waveguide sheet 32b is disposed corresponding to the incident grating 300b on the second waveguide sheet 32b, the incident groove 300a on the third waveguide sheet 32c is disposed corresponding to the incident grating 300b on the third waveguide sheet 32c, that is, the range of the incident groove 300a on the first waveguide sheet 32a is to cover the position of the incident grating 300b on the first waveguide sheet 32a, the range of the incident groove 300a on the second waveguide sheet 32b is to cover the position of the incident grating 300b on the second waveguide sheet 32b, and the range of the incident groove 300a on the third waveguide sheet 32c is to cover the position of the incident grating 300b on the third waveguide sheet 32 c.

Further, the light paths of the three light rays in the optical waveguide module 30 will be described in detail by taking the first light ray I, the second light ray J and the third light ray K as examples.

Specifically, the first light ray I is directed to the first waveguide sheet 32a along the incident direction Q of the light ray, enters the inside of the incident portion 300 of the first waveguide sheet 32a through the incident groove 300a on the first waveguide sheet 32a, and is diffracted at the incident grating 300b on the first waveguide sheet 32a to be guided to the exit grating 301a on the first waveguide sheet 32a inside the first waveguide sheet 32a and emitted toward the human eye 4 through the exit grating. The second light ray J is directed to the first waveguide sheet 32a along the incident direction Q of the light ray, and is directed to the incident groove 300a of the second waveguide sheet 32b through the incident through hole 320a on the first waveguide sheet 32a, so that the second light ray J enters the incident grating 300b of the second waveguide sheet 32b to be diffracted, is conducted inside the second waveguide sheet 32b to the exit grating 301a on the second waveguide sheet 32b and is emitted to the second waveguide sheet 32b, and passes through the first waveguide sheet 32a to be emitted to the first waveguide sheet 32a together with the first light ray I, to be directed to the human eye 4. The third light ray K is directed to the first waveguide sheet 32a along the incident direction Q of the light ray, and sequentially passes through the incident through hole 320a on the first waveguide sheet 32a and the incident through hole 320a on the second waveguide sheet 32b to be directed to the incident groove 300a of the third waveguide sheet 32c, so that the third light ray K enters the incident grating 300b of the third waveguide sheet 32c to be diffracted, is conducted inside the third waveguide sheet 32c to the exit grating 301a on the third waveguide sheet 32c, is emitted to the third waveguide sheet 32c, and sequentially passes through the second waveguide sheet 32b and the first waveguide sheet 32a to be emitted to the first waveguide sheet 32a together with the second light ray J and the first light ray I to be directed to the human eye 4.

It will be appreciated that as long as the optical waveguide module 30 includes a plurality of waveguide plates 32, for example, two, three, four, five or more waveguide plates 32, it can be used to implement single conduction of at least one light, so as to implement an effect of alleviating a phenomenon that each different light changes during conduction, and improving the definition of a color picture displayed by the display device 3. When the number of waveguide sheets 32 is equal to the number of different transmitted light rays, the variation of each different light ray in the transmission process is minimal, the quality of the color image displayed by the display device 3 is highest, and the specific correspondence between the number of waveguide sheets 32 and the number of different light rays included in the optical waveguide module 30 and the embodiment is not specifically limited.

The display device 3 of the present application can further realize the light engine 2 of miniaturized design by using the light engine 2 with high projected image quality and small total light length, so that the image display quality of the display device 3 is high, and the structure of the display device 3 is lighter and thinner.

Further, by providing the display device 3 with a plurality of light engines 2, the display device 3 can be used to project and display a fused pattern of the patterns projected by the plurality of light engines 2, and thus the display device 3 can be used to project and display a richer pattern, for example, a color pattern, a stereoscopic pattern with multiple levels of front and rear, or the like.

Referring to fig. 14, fig. 14 is a schematic diagram of the structure of a head-mounted device disclosed in a fourth aspect of the embodiment of the present application, in which a head-mounted device 5 including a display apparatus 3 according to the third aspect is disclosed. The head-mounted device 5 may include, but is not limited to, glasses (e.g., goggles, swimming goggles, myopia glasses, presbyopic glasses, etc.), helmets, and masks, etc. having an AR (augmented reality) display function, taking the head-mounted device 5 as an example of AR glasses, the AR glasses generally include glasses lenses, a frame, and legs, the glasses lenses are provided at the frame, the legs are connected to one side of the frame, the optical waveguide module 30 may be formed as at least part of the glasses, a light incident portion of the optical waveguide module 30 is provided at one side of the frame for connection to the legs, a light emitting portion of the optical waveguide module 30 is provided for projecting light to eyes of a user wearing the glasses, the light engine 2 may be provided at an inner portion of the legs and at one end of the legs for connection to the frame, and the legs of the glasses may be in communication with the inner portion of the frame such that light emitted by the light engine 2 can be directed to the light incident portion of the optical waveguide module 30.

It will be appreciated that since the display device 3 is used to project an image to one eye of a corresponding user, the head-mounted apparatus 5 may include two display devices 3 for projecting images to both eyes of the user, respectively, in order to enable both eyes of the user to see the image projected by the display device 3.

By using the display device 3 disclosed in the third aspect of the embodiment of the present invention, AR display quality of the head-mounted device 5 can be improved, and the structure of the head-mounted device 5 can be more compact and reasonable, so that a miniaturized design of the head-mounted device 5 can be realized, and the head-mounted device 5 has good usability and high convenience in use.

The light engine, the display device, the head-mounted device and the packaging method of the light engine disclosed in the embodiments of the present invention are described in detail, and specific examples are applied to illustrate the principles and the implementation of the present invention, and the description of the above embodiments is only used to help understand the light engine, the display device, the head-mounted device and the packaging method of the light engine and the core idea thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims

1. A light engine for use in AR eyewear, comprising:

a heat dissipation plate having a mounting surface;

the projection lens comprises a lens barrel and a lens arranged in the lens barrel, wherein the projection lens and the light-emitting assembly are integrally packaged, so that the object side end of the lens barrel is packaged and connected to the mounting surface, dust is prevented from adhering to the light-emitting assembly, a protective cover plate is not arranged between the projection lens and the light-emitting assembly, the transferring step of the light-emitting assembly is omitted, the light-emitting assembly is prevented from being separated from a clean environment, the lens faces to the light-emitting end of the light-emitting assembly, and the lens is used for receiving light rays emitted by the light-emitting assembly.

2. The light engine of claim 1, wherein the light assembly comprises a light member and a flexible circuit board, the flexible circuit board disposed on the mounting surface, the light member electrically connected to the flexible circuit board;

3. A light engine as recited in claim 2, wherein when said light emitting element is disposed on said mounting surface, said mounting surface is provided with a receiving recess, and said light emitting element is disposed in said receiving recess.

4. A packaging method of a light engine, wherein the light engine is applied to AR glasses, and comprises a heat dissipation plate, a light emitting component and a projection lens, wherein the heat dissipation plate is provided with a mounting surface, the projection lens comprises a lens barrel and a lens installed in the lens barrel, and the packaging method comprises the following steps:

mounting the light emitting assembly on the mounting surface;

the projection lens and the light-emitting component are integrally packaged, so that the object side end package of the lens barrel is connected to the mounting surface, dust is prevented from adhering to the light-emitting component, and the lens faces the light-emitting component, so that the light engine is obtained;

the light emitting end of the light emitting component is not provided with a protective cover plate, and the transferring step of the light emitting component is omitted, so that the light emitting component is prevented from being separated from a clean environment.

5. The packaging method of claim 4, wherein the light emitting assembly includes a light emitting member and a flexible circuit board, and the mounting the light emitting assembly on the mounting surface includes:

6. The packaging method according to claim 5, wherein the mounting surface is provided with a receiving groove, and the light emitting element is disposed in the receiving groove.

7. A display device comprising an optical waveguide module and the light engine of any one of claims 1-3, wherein the optical waveguide module is configured to receive light passing through the projection lens, and to conduct and emit the light.

8. The display device according to claim 7, wherein the plurality of light engines are provided, and at least two heat dissipation plates of the light engines are integrally connected.

9. The display device of claim 7, wherein the light engine is a plurality of the light engines, the plurality of the light engines being arranged in a ring.

10. A head-mounted device comprising a display device according to any of claims 7-9.