Projection light machine and wearable device

Abstract

The embodiment of the application discloses a projection light machine and a wearable device; wherein the projection light machine comprises a light source module, a light guide device, a light splitting device and a projection system; the light source module is used for emitting illumination light; the light guide device comprises a substrate and a coupling-in area and a coupling-out area arranged on the substrate, and the light source module is located on one side of the substrate provided with the coupling-in area; the light splitting device is embedded in the substrate; the projection system is located on the side of the substrate away from the light source module; the illumination light enters the substrate through the coupling-in area and then is emitted to the projection system to form projection light, the projection light is reflected to the substrate, and the light splitting device is located at least on the propagation path of the projection light, used for reflecting the projection light and making the projection light totally reflect and propagate in the substrate to the coupling-out area, and the coupling-out area is used for coupling out the projection light.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical projection technology, and in particular, the present application relates to a projection light machine and a wearable device. BACKGROUND

[0002] AR technology is a technology of fusing images to reality through optical methods to achieve augmented reality. Taking AR glasses as an example, it is one of the important forms of AR technology. Among them, the display is through two light machines to project images to the left and right eyes of the wearer respectively, and through image algorithms, the fusion distance of the binocular picture can be adjusted to let the human eye produce the distance sense of near and far.

[0003] However, the current projection light machine scheme has the problem of too large volume, such as DLP light machine volume in 5-6cc, traditional LCOS light machine in 3-4cc, which is not conducive to the lightweight of AR glasses. Specifically, the traditional projection light machine scheme is mainly divided into a light source part (or called an illumination part) and a projection imaging part, and the light source part often adopts multiple lamps and multiple channel light sources to finally pass through a light combining prism for light source unification, which often increases the volume and makes the whole projection light machine too bulky. SUMMARY

[0004] The purpose of the present application is to provide a new technical scheme of a projection light machine and a wearable device, which is a compact light machine optical architecture, at least solving the problem of large volume of the existing projection light machine.

[0005] According to a first aspect of the present application, a projection light machine is provided. The projection light machine comprises:

[0006] a light source module for emitting illumination light;

[0007] a light guide device, the light guide device comprising a substrate and a coupling-in region and a coupling-out region provided on the substrate, the light source module being located on one side of the substrate provided with the coupling-in region;

[0008] a light splitting device, the light splitting device being obliquely embedded in the substrate;

[0009] a projection system, the projection system being located on the side of the substrate away from the light source module, and at least part of the projection system being opposite to the coupling-in region;

[0010] The illumination light enters the substrate through the coupling-in region and then exits to the projection system to form a projection light, the projection light is reflected back into the substrate, and the light splitting device is located at least on the propagation path of the projection light, for reflecting the projection light and making the projection light totally reflect and propagate in the substrate to the coupling-out region, the coupling-out region is used for coupling out the projection light.

[0011] Optionally, the light source module and the light splitting device are arranged opposite to each other in a thickness direction of the substrate, the thickness direction being a direction perpendicular to two opposite surfaces of the substrate.

[0012] The light source module covers the coupling-in area on one side of the substrate, and the illumination light coupled into the substrate through the coupling-in area can be transmitted through the light splitting device and then exit into the projection system.

[0013] Optionally, the light source module and the light splitting device are arranged staggered with each other in a thickness direction of the substrate, the thickness direction being a direction perpendicular to two opposite surfaces of the substrate, and the illumination light coupled into the substrate through the coupling-in area directly exits into the projection system.

[0014] Optionally, the light source module and the light splitting device each occupy half of the coupling-in area.

[0015] Optionally, the light splitting device is provided as one or more.

[0016] Optionally, the light splitting device is a half-mirror, and a polarized reflection film is arranged on any surface of the light splitting device.

[0017] Optionally, the light source module comprises an illumination light source and a light homogenizing device, the light homogenizing device being arranged on an exit light path of the illumination light source; or the light source module is an LED dot array light source.

[0018] Optionally, the light source module can emit illumination light of multiple different wavebands, and the illumination light can directly enter the light guide device and then be transmitted to the projection system to form the projection light.

[0019] Optionally, the projection system comprises an ocular lens and an image source arranged in sequence.

[0020] The ocular lens comprises a plurality of lenses arranged along the same optical axis.

[0021] The image source comprises an LCOS chip or a DLP chip.

[0022] Optionally, the illumination light entering the projection system is projected to the image source through the ocular lens to form the projection light, the projection light is reflected by the image source to the ocular lens, and then is transmitted through the ocular lens to enter the substrate.

[0023] Optionally, the light guide device is an optical waveguide element.

[0024] According to a second aspect of the present application, a wearable device is also provided. The wearable device comprises:

[0025] a housing; and

[0026] The projection light machine according to the first aspect.

[0027] The application has the beneficial effects of:

[0028] The projection light machine provided by the embodiment of the application introduces a light guide device to transmit light between the light source module and the projection system, wherein the light source module and the projection system are arranged on two sides of the light guide device through the optimized design of the arrangement positions of the light source module, the light splitting device and the projection system, and the light splitting device is embedded in the base of the light guide device, so that the light source module and the projection system can share the optical path, and the light combining device is omitted in the whole optical architecture, the volume is compressed, the compact design of the optical architecture of the whole projection light machine is realized, and the problem of the existing projection light machine being too bulky due to the large volume is solved.

[0029] Other features and advantages of the present application will be apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application.

[0031] Figure 1 A structural schematic diagram of a projection light machine provided by an embodiment of the application;

[0032] Figure 2 A structural schematic diagram of a projection light machine provided by another embodiment of the application;

[0033] Figure 3 A structural schematic diagram of a projection light machine provided by still another embodiment of the application.

[0034] Explanation of reference signs:

[0035] 1, light source module; 2, light guide device; 21, base; 22, coupling-in area; 23, coupling-out area; 3, light splitting device; 4, projection system; 41, eyepiece; 42, image source; 01, illumination light; 02, projection light; 001, human eye. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments are not intended to limit the scope of the present application unless otherwise specifically stated.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the application or its application or uses.

[0038] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art(s) can not be discussed in detail herein. However, where appropriate, the techniques, methods, and apparatus should be considered as part of the description.

[0039] In all of the compositions shown and discussed herein, any specific value should be construed as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0040] It should be noted that like reference numerals and letters refer to like items throughout the attached drawings, and thus once an item is defined in one drawing, it is not necessary that it be further discussed in subsequent drawings.

[0041] The projection light machine and wearable device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0042] According to an aspect of the present application, a projection light machine is provided, which can be applied in an AR device, for example. The AR device is, for example, an AR head-mounted display device, such as AR glasses or an AR helmet, etc.

[0043] The projection light machine provided by the embodiments of the present application, as shown in Figures 1 to 3 , comprises a light source module 1, a light guide device 2, a light splitting device 3, and a projection system 4. The light source module 1 is configured to emit illumination light rays 01. The light guide device 2 comprises a substrate 21, and a coupling-in region 22 and a coupling-out region 23 arranged on the substrate 21, and the light source module 1 is arranged on one side of the substrate 21 where the coupling-in region 22 is arranged. The light splitting device 3 is arranged obliquely in the substrate 21. The projection system 4 is arranged on the side of the substrate 21 away from the light source module 1, and at least part of the projection system 4 is opposite to the coupling-in region 22. The illumination light rays 01 enter the substrate 21 through the coupling-in region 22 and then exit to the projection system 4 to form projection light rays 02, the projection light rays 02 are reflected into the substrate 21, and the light splitting device 3 is arranged at least on the propagation path of the projection light rays 02, which can be configured to reflect the projection light rays 02 and make the projection light rays 02 propagate in the substrate 21 by total reflection to the coupling-out region 23, and the coupling-out region 23 is configured to couple out the projection light rays 02.

[0044] The projection light machine provided by the above-mentioned embodiments, as shown in Figures 1 to 3The light source module 1 is a lighting part of a projection light machine, which can emit illumination light 01 for imaging display. The light guide device 2 can be used to transmit the illumination light 01 emitted by the light source module 1 into the projection system 4. The projection system 4 can form the projection light 02 with image information from the incident illumination light 01. When the projection light 02 enters the base 21 of the light guide device 2 again, the projection light 02 can be reflected by the light splitting device 3 embedded in the base 21 to change the light propagation direction, at this time, the light splitting device 3 is used as a mirror, and the projection light 02 can be totally reflected in the base 21 to the coupling-out area 23, and finally coupled out through the coupling-out area 23, thereby forming a projection picture. In this way, a user can view the projection picture from the side of the coupling-out area 23 of the light guide device 2.

[0045] The light guide device 2 is arranged between the light source module 1 and the projection system 4, and can be used to realize the transmission of light between the two. In the projection light machine provided in the embodiment of the present application, the light source module 1 and the projection system 4 are arranged on opposite sides of the base 21, which is a more reasonable layout of the optical architecture of the entire projection light machine.

[0046] For a traditional projection light machine scheme, the illumination part often uses multiple lamp beads to form a multi-channel light source, and a light combining device such as a light combining prism is arranged on the light transmission path to combine the light sources, that is, light combining processing, which increases the volume of the projection light machine and makes the entire projection light machine relatively bulky, which reduces the wearing comfort when applied to AR devices.

[0047] The projection light machine provided in the embodiment of the present application uses the light guide device 2 to transmit light between the light source module 1 and the projection system 4, which can eliminate the need to arrange a light combining device on the light path. The light combining device is large in size and occupies a large space. In the present application, the traditional light combining device is eliminated, the volume of the projection light machine is compressed, and the miniaturization and light weight of the projection light machine are realized.

[0048] The projection light machine according to the above-mentioned embodiment of the present application can be applied to the optical display part of, for example, AR glasses. Since the optical architecture of the projection light machine is relatively compact, the volume is relatively small, which is beneficial to realize the miniaturization design of the AR glasses, and the weight of the entire machine can be reduced, thereby improving the wearing comfort of the user.

[0049] The projection light machine provided by the embodiments of the present application is a compact optical structure design, wherein a light guide device 2 is introduced to conduct the illumination light 01 emitted by the light source module 1, and the illumination light 01 can include light rays of various wave bands. The illumination light 01 includes red light, green light and blue light, for example. The illumination light 01 can be coupled into the substrate 21 through the coupling-in area 22 on the substrate 21, and then emitted into the projection system 4 opposite to the coupling-in area 22. The illumination light 01 becomes the projection light 02 with image information, which can propagate in the total reflection state in the substrate 21 after being reflected by the light splitting device 3 embedded in the substrate 21, and finally coupled out of the substrate 21 to project and image.

[0050] In the projection light machine provided by the above embodiments of the present application, the light guide device 2 can play a role in propagating the illumination light 01 emitted by the light source module 1 to the projection system 4, and the projection light 02 formed can also propagate through the light guide device 2 and then be coupled out to project and image. The introduction of the light guide device 2 not only can save the setting of the light combining device, but also can make the light source module 1 and the projection system 4 share the optical path. The light guide device 2 is light and thin in appearance and small in size, which will not occupy a large space when applied in the projection light machine, and is beneficial to reducing the size and weight of the projection light machine.

[0051] The projection light machine provided by the embodiments of the present application introduces the light guide device 2 to transmit light between the light source module 1 and the projection system 4, wherein the layout positions of the light source module 1, the light splitting device 3 and the projection system 4 are optimized and designed, for example, the light source module 1 and the projection system 4 are designed to be separately arranged on the two sides of the light guide device 2, and the light splitting device 3 is embedded in the substrate 21 of the light guide device 2. This makes the light source module 1 and the projection system 4 share the optical path, and the light combining device is also saved in the whole optical architecture, which compresses the volume and realizes the compact design of the optical architecture of the whole projection light machine, and solves the problem of the existing projection light machine being too bulky due to the large volume.

[0052] In some examples of the present application, referring to Figure 1 and Figure 2 , the light source module 1 and the light splitting device 3 are oppositely arranged in the thickness direction of the substrate 21, the thickness direction is the direction perpendicular to the two opposite surfaces of the substrate 21; the light source module 1 covers the coupling-in area 22, so that the illumination light 01 coupled into the substrate 21 through the coupling-in area 22 can be transmitted through the light splitting device 3 and then emitted into the projection system 4.

[0053] It should be noted that the substrate 21 of the light guide device is, for example, a sheet with a certain thickness, the substrate 21 has two opposite surfaces, and the thickness direction of the substrate 21 is perpendicular to the two opposite surfaces.

[0054] According to the above examples, referring to Figure 1 and Figure 2 , the coupling-in area 22 on the substrate 21 is opposite to the projection system 4 in position, the light source module 1 is located on one side of the coupling-in area 22, and the light source module 1 is designed to occupy the entire coupling-in area 22, that is, the projection of the light source module 1 on the substrate 21 can cover the entire coupling-in area 22, at this time, the illumination light 01 emitted by the light source module 1 can cover the entire coupling-in area 22.

[0055] According to the above examples, the light splitting device 3 is obliquely embedded in the substrate 21 and opposite to the coupling-in area 22 in position, and it also occupies the entire coupling-in area 22. In this way, the illumination light 01 emitted by the light source module 1 enters the substrate 21 through the coupling-in area 22 and then passes through the light splitting device 3, at this time, the light splitting device 3 plays a role of transmitting light, so that the propagation path of the illumination light 01 emitted by the light source module 1 passes through the light splitting device 3 and then exits into the projection system 4.

[0056] The illumination light 01 passes through the projection system 4 and can form projection light 02 with image information, the projection light 02 is reflected into the substrate 21 and also encounters the light splitting device 3, at this time, the light splitting device 3 plays a role of mirror and can change the direction of light propagation, the projection light 02 coupled into the substrate 21 will be totally reflected and propagated to the coupling-out area 23, and finally form a projection image by being coupled out from the coupling-out area 23.

[0057] Among them, the light splitting device 3 is, for example, a half-mirror, which can transmit a part of light and reflect another part of light.

[0058] Among them, the light splitting device 3 can be obliquely embedded in the substrate 21.

[0059] Optionally, the light splitting device 3 can be provided as one, referring to Figure 1 At this time, the light splitting device 3 has a larger size. When one light splitting device 3 is embedded in the substrate 21, the one light splitting device 3 can be obliquely arranged at, for example, 30 degrees.

[0060] Optionally, the light splitting device 3 can be provided as multiple, referring to Figure 2For example, the light splitting device 3 can be provided as two or three. In this case, the size of each light splitting device 3 is small. The advantage of this design is that a large light splitting device can be split into multiple small light splitting devices, and the tilt angle of each small light splitting device can be set to be small, which can reduce the thickness of the substrate 21. For example, the thickness of the substrate 21 can be reduced to about 0.8 mm. Figure 1 The optical scheme of providing one light splitting device 3 shown in the middle of the figure is that the thickness of the substrate 21 is about 2 mm.

[0061] In some examples of the present application, referring to Figure 3 As shown, the light source module 1 and the light splitting device 3 are staggered in the thickness direction of the substrate 21, and the thickness direction is the direction perpendicular to the two opposite surfaces of the substrate 21. The illumination light rays 01 coupled into the substrate 21 through the coupling-in area 22 are directly emitted into the projection system 4.

[0062] In this case, the light source module 1 and the light splitting device 3 each occupy half of the coupling-in area 22.

[0063] According to the above examples, referring to Figure 3 , the size of the light source module 1 and the light splitting device 3 is small, specifically, each occupies half of the coupling-in area 22; and the light source module 1 and the light splitting device 3 are staggered on the two sides of the coupling-in area 22. In this way, the illumination light rays 01 emitted by the light source module 1 do not pass through the light splitting device 3 during the process of being emitted from the light guide device 2 to the projection system 4, which can improve the light energy utilization. The projection light rays 02 emitted by the projection system 4 will be reflected by the light splitting device 3 during propagation in the substrate 21, which changes the light propagation path, so that the projection light rays 02 can propagate by total reflection in the substrate 21 to the coupling-out area 23.

[0064] Referring to Figure 3 , the design of the above examples can meet the basic projection imaging brightness and clarity requirements of the projection light machine. Moreover, the size of the light source module 1 and the light splitting device 3 is small, which can further reduce the volume and weight of the entire projection light machine, and also reduce the production cost.

[0065] In some examples of the present application, referring to Figures 1 to 3 , the light splitting device 3 is provided as one or more.

[0066] The light splitting device 3 is arranged in the base 21 of the light guide device 2, and if the light splitting device 3 is arranged in multiple, the inclination angle of each light splitting device 3 can be relatively small, which is beneficial to reduce the thickness of the base 21, for example, the thickness of the base 21 is about 8 mm.

[0067] In some examples of the present application, the light splitting device 3 is a half mirror, and a polarized reflection film is arranged on any surface of the light splitting device 3.

[0068] According to the above examples, the light splitting device 3 has a polarization characteristic.

[0069] The light splitting device 3 adopts a half mirror, which is beneficial to reduce the thickness of the base 21, and does not increase the size and weight of the entire projection light machine.

[0070] In some examples of the present application, the light source module 1 includes an illumination light source and a light homogenizing device, and the light homogenizing device is arranged on the light output path of the illumination light source; or the light source module 1 is a LED dot array light source.

[0071] The illumination light source includes, for example, different color lamps, which can emit light of different colors such as red, green and blue. Of course, the illumination light source can also include other color lamp beads as long as it can emit visible light.

[0072] It should be noted that the light source module 1 can include a light homogenizing device, or the light source module 1 can directly adopt a mini-LED dot array light source, and the emitted illumination light 01 is already relatively uniform, without the need to introduce a light homogenizing device.

[0073] In some examples of the present application, the light source module 1 can emit illumination light 01 of multiple different wavebands, and the illumination light 01 can directly enter the light guide device 2 and then be transmitted to the projection system 4 to form the projection light 02.

[0074] The projection light machine provided by the embodiments of the present application does not need to arrange a light combining device on the light output path of the light source module 1, and the illumination light 01 of multiple different wavebands emitted by the light source module 1 can be directly projected into the light guide device 2, and the light guide device 2 transmits the light. Compared with the traditional light combining device, the light guide device 2 is light and thin in appearance and small in size, which does not occupy a large space when applied in the projection light machine, and is beneficial to reduce the size and weight of the projection light machine.

[0075] In some examples of the present application, referring to Figures 1 to 3The projection system 4 comprises, in sequence, an eyepiece 41 and an image source 42; the eyepiece 41 comprises a plurality of lenses arranged along the same optical axis; and the image source 42 comprises an LCOS chip or a DLP chip.

[0076] The illumination light 01 entering the projection system 4 is transmitted through the eyepiece 41 and then projected to the image source 42, at which time the projection light 02 is formed, the projection light 02 is reflected by the image source 42 to the eyepiece 41, and then transmitted through the eyepiece 41 and enters the substrate 21.

[0077] According to the above examples, the projection system 4 comprises, for example, the eyepiece 41 and the image source 42 described above.

[0078] According to the above examples, the projection system 4 comprises, for example, the eyepiece 41 and the image source 42 described above. Figure 1 and Figure 2 According to the optical architecture shown in FIG. 1, the light source module 1 and the light splitting device 3 both occupy the entire field of view of the eyepiece 41. Figure 3 According to the optical architecture shown in FIG. 2, half of the field of view of the eyepiece 41 is used for the light source module 1, and the other half is used for the light splitting device 3.

[0079] According to the above examples of the present application, the eyepiece 41 and the image source 42 are located on the same side of the light guide device 2, which is a simple layout.

[0080] The projection light machine provided by the embodiments of the present application introduces the light guide device 2 to realize the entry, transmission and coupling-out of the light rays of the illumination part of the projection light machine, which can reduce the production process difficulty and production cost of the projection light machine, and in addition, eliminates the light combining device of the traditional scheme, optimizes the size, and reduces the weight of the projection light machine.

[0081] In some examples of the present application, the light guide device 2 is a light waveguide element.

[0082] The substrate 21 is a waveguide substrate, and the entire projection light machine is based on a diffractive optical waveguide to transmit light rays.

[0083] The projection light machine provided by the present application is further described below through Examples 1-3.

[0084] Example 1

[0085] Referring to Figure 1The projection light machine comprises a light source module 1, a light guide device 2, a light splitting device 3 and a projection system. The light source module 1 can emit light rays of different wave bands. The light guide device 2 comprises a substrate 21 and a coupling-in area 22 and a coupling-out area 23 arranged on the substrate 21. The light source module 1 is located on the side of the substrate 21 provided with the coupling-in area 22. At least part of the projection system 4 is opposite to the coupling-in area 22. The light splitting device 3 is a half mirror, and a polarized reflection film is arranged on any surface of the half mirror, and the half mirror is arranged in the substrate 21. The projection system 4 is located on the side of the substrate 21 away from the light source module 1. The projection system 4 comprises an ocular lens 41 and an image source 42 arranged in sequence. The ocular lens 41 comprises a plurality of lenses arranged along the same optical axis, and the image source is an LCOS chip.

[0086] The light source module 1 and the light splitting device 3 are arranged in correspondence in the thickness direction of the substrate 21, and the light source module 1 covers the coupling-in area 22. The illumination light rays 01 enter the substrate 21 through the coupling-in area 22, and can be transmitted through the light splitting device 3 and then exit into the projection system 4. The illumination light rays 01 form projection light rays 02, which are reflected into the substrate 21. At this time, the light splitting device 3 is also used for reflecting the projection light rays 02 and making the projection light rays 02 totally reflect and propagate in the substrate 21 to the coupling-out area 23. The coupling-out area 23 is used for coupling out the projection light rays 02.

[0087] Embodiment 2

[0088] Referring to Figure 2 The difference between the present embodiment and the above-mentioned embodiment 1 is that the layout mode of the light splitting device 3 arranged in the substrate 21 is different. In the present embodiment, a plurality of light splitting devices 3 with smaller sizes are embedded in the substrate 21.

[0089] Compared with embodiment 1, the scheme of the present embodiment can reduce the thickness of the substrate 21.

[0090] Embodiment 3

[0091] Referring to Figure 3 The difference between the present embodiment and the optical framework of the projection light machine provided in embodiment 1 is that the light splitting device 3 and the light source module 1 respectively occupy half of the coupling-in area 22, and the light source module 1 and the light splitting device 3 are arranged in mutual staggered mode in the thickness direction of the substrate 21. This design makes the illumination light rays 01 coupled into the substrate 21 through the coupling-in area 22 directly exit into the projection system 4, that is, the illumination light rays 01 do not pass through the light splitting device 3 and are directly projected into the projection system 4.

[0092] In yet another aspect, the embodiments of the present application also provide a wearable device. The wearable device comprises a housing and the projection light machine as described above.

[0093] The wearable device described above is, for example, an AR smart glasses or an AR smart helmet.

[0094] The specific implementation of the projection light machine and the wearable device of the embodiments of the present application can refer to the embodiments of the projection light machine described above, and thus has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0095] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A projection light machine, characterized in that: include: A light source module (1) for emitting illumination light (01); A light guide device (2), the light guide device (2) comprising a substrate (21) and an incoupling region (22) and an outcoupling region (23) provided on the substrate (21), the light source module (1) being located on a side of the substrate (21) where the incoupling region (22) is provided; A spectroscopic device (3), wherein the spectroscopic device (3) is obliquely embedded in the substrate (21); a projection system (4), the projection system (4) being located on a side of the substrate (21) facing away from the light source module (1), and at least a portion of the projection system (4) being opposite to the coupling-in region (22); The illumination light (01) enters the substrate (21) through the coupling-in region (22) and then emerges into the projection system (4) to form a projection light (02). The projection light (02) is reflected back into the substrate (21), and the optical splitter (3) is at least located on the propagation path of the projection light (02) and is used to reflect the projection light (02) and cause the projection light (02) to be totally reflected in the substrate (21) and propagate to the coupling-out region (23). The coupling-out region (23) is used to couple out the projection light (02).

2. The projection light engine according to claim 1, wherein: The light source module (1) and the light splitting device (3) are arranged opposite to each other in the thickness direction of the substrate (21), and the thickness direction is a direction perpendicular to two opposite surfaces of the substrate (21); The light source module (1) covers the coupling-in area (22) on one side of the substrate (21); the illumination light (01) coupled into the substrate (21) through the coupling-in area (22) can be transmitted through the light splitting device (3) and then emitted into the projection system (4).

3. The projection light engine according to claim 1, wherein: The light source module (1) and the light splitting device (3) are staggered in a thickness direction of the substrate (21), wherein the thickness direction is perpendicular to two opposite surfaces of the substrate (21), and the illumination light (01) coupled into the substrate (21) through the coupling region (22) is directly emitted into the projection system (4).

4. The projection light engine according to claim 3, wherein: The light source module (1) and the light splitting device (3) each occupy half of the coupling-in area (22).

5. The projection light engine according to any one of claims 1 to 4, characterized in that: The optical splitter (3) is provided as one or more.

6. The optical projection machine according to claim 5, wherein: The optical splitter (3) is a semi-reflective and semi-mirror lens, and a polarized reflective film is provided on any surface of the optical splitter (3).

7. The optical projection machine according to claim 5, wherein: The light source module (1) comprises an illumination light source and a light homogenizing device, wherein the light homogenizing device is arranged on a light output path of the illumination light source; alternatively, the light source module (1) is an LED point array light source.

8. The optical projection machine according to claim 7, wherein: The light source module (1) is capable of emitting illumination light (01) of multiple different wavelength bands, and the illumination light (01) can directly enter the light guide device (2) and then be transmitted to the projection system (4) to form the projection light (02).

9. The optical projection machine according to claim 5, wherein: The projection system (4) includes an eyepiece (41) and an image source (42) arranged in sequence; The eyepiece (41) includes a plurality of lenses arranged along the same optical axis; The image source (42) includes an LCOS chip or a DLP chip.

10. The optical projection machine according to claim 9, wherein: The illumination light entering the projection system (4) passes through the eyepiece (41) and is projected onto the image source (42) to form the projection light (02). The projection light (02) is reflected from the image source (42) to the eyepiece (41), and then enters the substrate (21) after being transmitted through the eyepiece (41).

11. The optical projection machine according to claim 1, wherein: The light guide device (2) is an optical waveguide element.

12. A wearable device, characterized in that: include: case; as well as The projection light machine according to any one of claims 1 to 11.

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