Projection display modules and wearable devices

Abstract

The embodiment of the present application provides a projection display module and a wearable device; wherein the projection display module includes a light source assembly, a light combining device, a first corner prism, a second corner prism, a light splitting device and a projection system; the light source assembly includes two, and the two light source assemblies are adjacent and spaced apart; the light combining device and the light source assembly are arranged in a one-to-one correspondence, and the light combining device is arranged on the light output path of the corresponding light source assembly; the first corner prism and the second corner prism are respectively arranged on the light output path of the two light combining devices; the light splitting device is located between the first corner prism and the second corner prism; the projection system includes at least a projection lens, the projection system is located between the two light source assemblies in a first direction, and the projection system is adjacent to and spaced apart from the light splitting device in a second direction, the first direction is the optical axis direction of the projection lens, and the second direction is perpendicular to the first direction. The projection display module provided by the embodiment of the present application has a compact structure and good projection imaging effect.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical projection imaging technology. More specifically, the embodiments of the present application relate to a projection display module and a wearable device. Background Art

[0002] With advances in optical imaging technology, people's demand for immersive experiences is growing. In recent years, VR / AR technologies have developed rapidly, gradually satisfying people's pursuit of visual experience. Head-mounted display devices can free people's hands, reduce their dependence on screens, and create better visual effects.

[0003] For head-mounted display devices, near-eye display is the key technology, while image quality and lightweight design are primary considerations. Existing AR (Augmented Reality) products based on diffractive waveguide solutions primarily utilize displays such as LCOS (Liquid Crystal on Silicon), DLP, or Micro LED. AR products using DLP and LCOS, due to their passive lighting, are relatively large, hindering miniaturization and thinness. Summary of the Invention

[0004] The purpose of this application is to provide a new technical solution for projection display module and wearable device.

[0005] In a first aspect, the present application provides a projection display module. The projection display module comprises:

[0006] A light source assembly, comprising two light source assemblies, the two light source assemblies being adjacent and spaced apart;

[0007] A light combining device, wherein the light combining device and the light source assembly are arranged in a one-to-one correspondence, and the light combining device is provided on the light output path of the corresponding light source assembly;

[0008] A first corner prism and a second corner prism, wherein the first corner prism and the second corner prism are respectively arranged on the light output paths of the two light combining devices;

[0009] A spectrometer, located between the first corner prism and the second corner prism;

[0010] A projection system, the projection system including at least a projection lens, the projection system being located between the two light source assemblies in a first direction, and the projection system being adjacent to and spaced apart from the spectroscopic device in a second direction, the first direction being the optical axis direction of the projection lens, and the second direction being perpendicular to the first direction.

[0011] Optionally, each of the light source assemblies includes a light source and a light homogenizing device located on the light output path of the light source;

[0012] The light combining device and the light homogenizing device are arranged in a one-to-one correspondence. The light combining device is located on the light output path of the corresponding light homogenizing device, and the two are arranged adjacent to each other.

[0013] Optionally, the light source is an all-in-one light source capable of emitting projection light of different wavelength bands; the light homogenizing device includes at least one of a super lens, a beam shaping lens and a CPC reflective bowl.

[0014] Optionally, the projection display module further comprises an optical waveguide device, wherein the optical waveguide device comprises a waveguide substrate, and an incoupling region and an outcoupling region provided on the waveguide substrate;

[0015] The coupling-in region is located on the light output path of the projection system, and is used to couple the light emitted by the projection system into the waveguide substrate and cause the light to be totally reflected in the waveguide substrate and propagate to the coupling-out region.

[0016] The outcoupling region is used to outcouple the light propagating to the outcoupling region.

[0017] Optionally, the coupling region includes a first coupling port and a second coupling port;

[0018] The outcoupling region includes a first coupling outlet and a second coupling outlet;

[0019] The light emitted by the projection system is divided into two paths for propagation:

[0020] A portion of the light is coupled into the waveguide substrate through the first coupling inlet and propagates to the first coupling outlet through total reflection; another portion of the light is coupled into the waveguide substrate through the second coupling inlet and propagates to the second coupling outlet through total reflection;

[0021] The first coupling port is used to couple out the light from the first coupling port, and the second coupling port is used to couple out the light from the second coupling port, so that the first coupling port and the second coupling port can couple the corresponding light into the user's left eye and right eye respectively to achieve binocular projection imaging.

[0022] Optionally, the coupling-in region includes a third coupling port, and the coupling-out region includes a third coupling port;

[0023] The light emitted from the projection system is directly coupled into the waveguide substrate through the third coupling port and propagates to the third coupling port through total reflection. The third coupling port couples the light propagated to the third coupling port out to the left eye or right eye of the user.

[0024] Optionally, the light combining device includes a first right-angle prism, a second right-angle prism, and a color combining prism; wherein the color combining prism is located between the first right-angle prism and the second right-angle prism;

[0025] The first right-angle prism, the color-combining prism, and the second right-angle prism are glued together to form a whole, wherein a right-angled side of the first right-angle prism is glued to a surface of the color-combining prism, and a right-angled side of the second right-angle prism is glued to a surface of the color-combining prism.

[0026] Optionally, the light splitting device is glued between the first corner prism and the second corner prism.

[0027] Optionally, the light splitting device includes a first light splitting prism, a second light splitting prism and a third light splitting prism;

[0028] The third beam splitter prism is located between the first beam splitter prism and the second beam splitter prism, and the oblique surface of the first beam splitter prism is glued to one right-angle surface of the third beam splitter prism, and the oblique surface of the second beam splitter prism is glued to another right-angle surface of the third beam splitter prism, and the two glued surfaces are coated with or adhered with a PBS film, and the PBS film can be used to transmit P-polarized light and reflect S-polarized light at the same time.

[0029] Optionally, the projection system further includes a projection chip, and the projection chip is located on a side of the projection lens away from the light splitting device.

[0030] Optionally, the projection chip includes an LCOS display chip or a DLP display chip.

[0031] Optionally, the S-polarized light emitted by one of the light sources is beam-shaped and homogenized by the corresponding light homogenizer and then projected to the light combining device for beam combining. The combined light passes through the second corner prism, the second beam splitting prism in the beam splitting device, and the projection lens to be incident on the projection chip. The S-polarized light incident on the projection chip is converted into P-polarized light and carries display image information and is sequentially emitted through the projection lens, the first beam splitting prism in the beam splitting device, and the third beam splitting prism;

[0032] The S-polarized light emitted by the other light source is beam shaped and homogenized by the corresponding light homogenizer and then projected onto the light combining device for beam combining. The combined light is incident on the projection chip through the first corner prism, the first beam splitting prism in the beam splitting device, and the projection lens. The S-polarized light incident on the projection chip is converted into P-polarized light and carries the display image information and is sequentially emitted through the projection lens, the second beam splitting prism in the beam splitting device, and the third beam splitting prism.

[0033] In a second aspect, the present application provides a wearable device, comprising:

[0034] housing; and

[0035] As in the projection display module of the first aspect, the projection display module is disposed in the housing.

[0036] The beneficial effects of this application are:

[0037] The projection display module provided by the embodiments of the present application utilizes a symmetrical optical architecture, which, while maintaining a compact design, can significantly enhance the brightness of the projection display module, thereby improving the quality of projected images. This symmetrical optical architecture makes the entire projection display module structure more compact, significantly reducing the module's size, and thus the size of products incorporating it. This facilitates the miniaturization of projection imaging products and meets the requirements of high-definition imaging.

[0038] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0040] Figure 1 This is one of the structural diagrams of the projection display module provided in an embodiment of the present application;

[0041] Figure 2 This is a second structural diagram of the projection display module provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the working principle of a light homogenizing device provided in an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 10. Light source; 20. Light homogenizer; 30. Light combining device; 31. First right-angle prism; 32. Second right-angle prism; 33. Color combining prism; 41. First corner prism; 42. Second corner prism; 50. Light splitting device; 51. First beam-splitting prism; 52. Second beam-splitting prism; 53. Third beam-splitting prism; 60. Projection lens; 70. Projection chip; 81. First coupling port; 82. Second coupling port; 83. Third coupling port; 91. First coupling outlet; 92. Second coupling outlet; 93. Third coupling outlet; 01. Left eye; 02. Right eye. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0047] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0048] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0050] The projection display module and wearable device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0051] According to one embodiment of the present application, a projection display module is provided. One form of the projection display module is, for example, a projection light engine used in an AR device. Of course, the projection display module can also be used in products with projection imaging functions, such as home projectors.

[0052] According to the projection display module provided in the embodiment of the present application, see Figure 1 and Figure 2 As shown, the projection display module includes: a light source assembly, a light combining device 30, a first corner prism 41, a second corner prism 42, a light splitting device 50 and a projection system. The light source assembly includes two, and the two light source assemblies are adjacent and spaced apart. The light combining device 30 and the light source assembly are arranged in a one-to-one correspondence, and the light combining device 30 is arranged on the light output path of the corresponding light source assembly. The first corner prism 41 and the second corner prism 42 are respectively arranged on the light output paths of the two light combining devices. The light splitting device 50 is located between the first corner prism 41 and the second corner prism 42. The projection system includes at least a projection lens 60, which is located between the two light source assemblies in a first direction, and the projection system is adjacent to and spaced apart from the light splitting device 50 in a second direction. The first direction is the optical axis direction of the projection lens 60, and the second direction is perpendicular to the first direction.

[0053] According to the projection display module provided in the above embodiment of the present application, its overall optical architecture mainly includes two light source components, two light combining devices 30 (such as X-cube light combining devices), two corner prisms, and a light splitting device 50 (such as PBS prism) and a projection system, see Figure 1 and Figure 2 These optical devices form a symmetrical optical structure through a special structural arrangement design, which makes the entire projection display module compact and improves its brightness.

[0054] The projection display module provided in the above-mentioned embodiments of the present application can greatly reduce its own volume size based on the characteristics of compact structural design. When the projection display module provided in the embodiments of the present application is applied to, for example, an AR device, it can effectively reduce the volume of the AR device and realize the miniaturized appearance and structural design of the AR device. Moreover, it can also improve the imaging resolution. In other words, the projection display module provided in the embodiments of the present application can take into account the projection imaging quality while being small in size.

[0055] The projection display module provided in the above embodiments of the present application can be applied as a projection light machine in an AR device, for example. Of course, it can also be other forms of projection devices, which are not limited in this application.

[0056] For example, two light source assemblies can be provided. A light combiner 30 is positioned along the light propagation path of each light source module. Light is then redirected by corresponding corner prisms and projected onto the light splitter 50. The light splitter 50 is designed to be shared by the projection light emitted by both light source assemblies. This creates a symmetrical and compact overall layout, simplifying assembly. Furthermore, the dual light source design effectively improves the brightness of the projection display module.

[0057] The projection display module provided by the embodiments of the present application utilizes a symmetrical optical architecture, which, while maintaining a compact design, can significantly enhance the brightness of the projection display module, thereby improving the quality of projected images. This symmetrical optical architecture makes the entire projection display module structure more compact, significantly reducing the module's size, and thus the size of products incorporating it. This facilitates the miniaturization of projection imaging products and meets the requirements of high-definition imaging.

[0058] In some examples of this application, see Figure 1 and Figure 2As shown, each light source assembly includes a light source 10 and a light homogenizing device 20 located on the light output path of the light source 10. The light combining device 30 is arranged in a one-to-one correspondence with the light homogenizing device 20, and the light combining device 30 is located on the light output path of the corresponding light homogenizing device 20, and the two are arranged adjacent to each other.

[0059] According to the above example, in addition to the light source 10 that can emit projection light, the light source assembly is also provided with the light homogenizer 20. The light homogenizer 20 is used to homogenize the projection light, such as visible light, emitted by the light source 10. The light homogenizer 20 can evenly project the projection light into the projection system, thereby improving the projection imaging effect.

[0060] It should be emphasized that the projection display module provided in the embodiment of the present application includes, for example, two light sources 10 arranged symmetrically on the left and right. Figure 1 and Figure 2 At this time, a light homogenizer 20 is also required to be separately provided for each light source 10. In this way, the volume of a single light homogenizer 20 does not need to be designed to be too large, and assembly space can be reserved between two light homogenizers 20 to accommodate the projection system, which makes the optical structure of the entire projection display module more reasonable and compact.

[0061] Optionally, the light source 10 is an all-in-one light source capable of emitting projection light of different wavelength bands. The light homogenizing device 20 includes at least one of a super lens, a beam shaping lens, and a CPC reflective bowl.

[0062] For example, the light source 10 includes at least one of an all-in-one laser light source and an all-in-one LED light source. In other words, the light source 10 can be a laser light source or an LED light source.

[0063] Specifically, the light source 10 is a three-in-one laser light source that can emit red (R), green (G), and blue (B) light. Of course, the light source 10 can also emit light of other wavelengths (colors), including but not limited to the three colors mentioned above, as long as the projected light is visible light, an image can be projected.

[0064] The light homogenizer 20 is arranged on the light propagation path of the corresponding light source 10, and can be used to homogenize the laser emitted by the light source 10. By homogenizing the laser emitted by the corresponding light source 10 through the light homogenizer 20, the laser can be evenly projected to the corresponding corner prism, and then enter the projection system through the spectrometer 50, and finally high-definition projection imaging can be achieved.

[0065] After the projection light / laser emitted by the light source 10 passes through the light homogenizing device 20 , the central light spot and the edge light spot formed have the same or similar brightness, which can improve the quality of the entire projection image.

[0066] The light homogenizing device 20 may be, for example, a super lens. In this case, the light source assembly includes a light source 10 and a super lens.

[0067] A metalens is a micron-scale optical shaping lens. A metalens is a two-dimensional metamaterial constructed by a sequence of planar artificial atoms arranged in a specific manner. Specifically, the principle of metalens beam shaping can be found in Figure 3 As shown: the light source 10 emits a beam of projection light / laser, which can achieve beam collimation and uniform light effects after passing through the super lens.

[0068] Of course, the light homogenizing device 20 includes but is not limited to a super lens. The light homogenizing device 20 can also be a traditional beam shaping lens or a CPC reflective bowl or other light homogenizing device.

[0069] In some examples of this application, see Figure 1 and Figure 2 The projection optical module further includes an optical waveguide device, which includes a waveguide substrate, and an incoupling region and an outcoupling region provided on the waveguide substrate; wherein the incoupling region is located on the light output path of the projection system, and the incoupling region is used to couple the light emitted by the projection system into the waveguide substrate and cause the light to be totally reflected in the waveguide substrate and propagate to the outcoupling region; the outcoupling region is used to couple out the light propagating to the outcoupling region.

[0070] According to the above example, an optical waveguide device is incorporated into the projection display module to transmit light emitted by the projection system to the human eye for final imaging. The optical waveguide device inherently offers a large field of view, high light transmittance, and a thin and lightweight design. This reduces the weight and volume of the entire projection display module while improving projection image quality, providing users with a superior immersive experience.

[0071] In one example, see Figure 1As shown, the coupling-in area includes a first coupling inlet 81 and a second coupling inlet 82; the coupling-out area includes a first coupling outlet 91 and a second coupling outlet 92; the light emitted by the projection system is divided into two paths for propagation: a part of the light is coupled into the waveguide substrate through the first coupling inlet 81 and is totally reflected and propagated to the first coupling outlet 91; the other part of the light is coupled into the waveguide substrate through the second coupling inlet 82 and is totally reflected and propagated to the second coupling outlet 92; the first coupling outlet 91 is used to couple out the light from the first coupling inlet 81, and the second coupling outlet 92 is used to couple out the light from the second coupling inlet 82, so that the first coupling outlet 91 and the second coupling outlet 92 can respectively couple the corresponding light into the user's left eye 01 and right eye 02 to achieve binocular projection imaging.

[0072] According to the above example, the projection display module provided in the embodiment of the present application includes two light source assemblies and has sufficient brightness; and by designing the entire optical structure into a symmetrical design, binocular display can be achieved based on only a single projection system.

[0073] Based on the symmetrical optical architecture provided in the above example, a single optical waveguide device can be used to achieve a binocular display effect. This greatly reduces the volume and cost of the entire projection display module, facilitates subsequent miniaturized appearance and structural design, and is more conducive to the integrated design of back-end devices such as AR devices.

[0074] In another example, see Figure 2 The coupling-in area includes a third coupling port 83, and the coupling-out area includes a third coupling port 93; the light emitted by the projection system is directly coupled into the waveguide substrate through the third coupling port 83 and propagates to the third coupling port 93 through total reflection, and the third coupling port 93 couples the light propagated to the third coupling port 93 out to the user's left eye 01 or right eye 02.

[0075] According to the above examples, the projection display module provided in the embodiment of the present application can also realize monocular projection imaging. Figure 2 The imaging light emitted through the third coupling port 93 directly enters one of the user's eyes. Figure 2 In this case, two projection display modules are required to respectively adapt to the user's left eye 01 and right eye 02.

[0076] It should be emphasized that when the projection display module provided in the embodiment of the present application is used for a monocular projection imaging solution, because two light source components are designed therein, the brightness of the module can be greatly improved, thereby better improving the resolution of the projection imaging, so that users can obtain a better visual experience.

[0077] In some examples of this application, see Figure 1 and Figure 2 The light combining device 30 includes a first right-angle prism 31, a second right-angle prism 32 and a color combining prism 33; wherein the color combining prism 33 is located between the first right-angle prism 31 and the second right-angle prism 32; the first right-angle prism 31, the color combining prism 33 and the second right-angle prism 32 are glued together into a whole, a right-angle side of the first right-angle prism 31 is glued to a surface of the color combining prism 33, and a right-angle side of the second right-angle prism 32 is glued to a surface of the color combining prism 33.

[0078] According to the above example, the light combining device 30 includes two right-angle prisms, namely the first right-angle prism 31 and the second right-angle prism 32. In addition, the light combining device 30 also includes a color combining prism 33 (X-cube prism). The two right-angle prisms are symmetrically arranged on the left and right sides of the color combining prism 33, see Figure 1 and Figure 2 The three are glued together to form a whole, which is conducive to the assembly of the entire light-combining device 30 and can appropriately reduce the difficulty of generating the projection display module.

[0079] Introducing the color combining prism 33 into the light combining device 30 can greatly compress the optical etendue of the light source component, such as the RGB three-color laser spot, thereby greatly improving the light coupling efficiency of the projection display module and enhancing the light effect.

[0080] In some examples of the present application, the light splitting device 50 is glued between the first corner prism 41 and the second corner prism 42 .

[0081] According to the above example, the light splitter 50 is assembled with two corner prisms. The first corner prism 41 and the second corner prism 42 can respectively project light transmitted from different light source assemblies (two light source assemblies) into the light splitter 50.

[0082] In some examples of this application, see Figure 1 and Figure 2 The spectrometer 50 includes a first spectrometer 51, a second spectrometer 52, and a third spectrometer 53; wherein the third spectrometer 53 is located between the first spectrometer 51 and the second spectrometer 52, and the oblique surface of the first spectrometer 51 is glued to one right-angle surface of the third spectrometer 53, and the oblique surface of the second spectrometer 52 is glued to another right-angle surface of the third spectrometer 53, and the two glued surfaces are coated with or attached with a PBS film, and the PBS film can be used to transmit P-polarized light and reflect S-polarized light.

[0083] According to the above example, the optical splitter 50 mainly includes three right-angle beam splitter prisms (PBS prisms), namely the first beam splitter prism 51, the second beam splitter prism 52 and the third beam splitter prism 53. Figure 1 The oblique surface of the first beam splitter prism 51 is glued to a right-angled surface of the third beam splitter prism 53, and the oblique surface of the second beam splitter prism 52 is glued to another right-angled surface of the third beam splitter prism 53. The oblique surfaces of the first beam splitter prism 51 and the second beam splitter prism 52 can be coated with a PBS film or a PBS film can be attached to them, so that, for example, they can transmit one of the S-polarized light and the P-polarized light, and at the same time reflect the other of the S-polarized light and the P-polarized light.

[0084] See also Figure 1 Taking the light propagation path emitted by the light source assembly on the left as an example, the S-polarized laser emitted by the light source assembly on the left is beam-shaped by the light homogenizing device 20, such as a super lens, and then combined by the light combining device 30, and then projected into the projection system through the second corner prism 42 and the second beam splitting prism 52.

[0085] Please continue to see Figure 1 The light propagation path emitted by the light source assembly on the right is basically the same as that of the light source assembly on the left, and will not be repeated here.

[0086] In some examples of this application, see Figure 1 and Figure 2 The projection system further includes a projection chip 70 , and the projection chip 70 is located on a side of the projection lens 60 away from the light splitting device 50 .

[0087] The projection chip 70 includes, for example, an LCOS display chip or a DLP display chip.

[0088] It should be noted that LCOS display chips and DLP display chips are both passively illuminated.

[0089] Taking the LCOS display chip as an example, the S-polarized light incident on the LCOS display chip can be converted into P-polarized light after being modulated by the LCOS display chip, and then carries the display image information and is coupled into the optical waveguide device after passing through the projection lens 60 and the spectrometer 50 in sequence. The light coupled out of the optical waveguide device can realize projection imaging.

[0090] In some examples of this application, see Figure 1 and Figure 2The S-polarized light emitted by one of the light sources 10, for example, the light source on the left, is beam-shaped and homogenized by the corresponding light homogenizer 20 and then projected to the light combining device 30 for combining. The combined light passes through the second corner prism 42, the second beam splitter prism 52 in the beam splitter 50, and the projection lens 60 and is incident on the projection chip 70. The S-polarized light incident on the projection chip 70 is converted into P-polarized light and carries the display image information and is sequentially emitted through the projection lens 60, the first beam splitter prism 51, and the third beam splitter prism 53 in the beam splitter 50.

[0091] The S-polarized light emitted by another light source 10, for example, the light source on the right, is beam-shaped and homogenized by the corresponding light homogenizer 20 and then projected to the light combining device 30 for combining. The combined light is incident on the projection chip 70 through the first corner prism 41, the first beam splitting prism 51 in the beam splitting device 50, and the projection lens 60. The S-polarized light incident on the projection chip 70 is converted into P-polarized light and carries the display image information and is sequentially emitted through the projection lens 60, the second beam splitting prism 52, and the third beam splitting prism 53 in the beam splitting device 50.

[0092] According to another embodiment of the present application, a wearable device is provided.

[0093] The wearable device includes a housing and the projection display module as described above, and the projection display module is arranged in the housing.

[0094] The wearable device includes a head-mounted display device, such as AR glasses or an AR helmet. In this case, the projection display module can form an AR projection light machine, for example. Of course, the wearable device can also be a VR product, etc., which is not limited in the embodiments of the present application.

[0095] In addition, the projection display module provided in the embodiment of the present application can also be used in other types of projection devices such as home projectors and car projectors, etc., and this is not limited in the embodiment of the present application.

[0096] The housing structure is different based on the type of the projection product.

[0097] The specific implementation of the wearable device of the embodiment of the present application can refer to the above-mentioned embodiments of the projection display module, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0098] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0099] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples may 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 display module, characterized in that: include: A light source assembly, comprising two light source assemblies, the two light source assemblies being adjacent and spaced apart; A light combining device (30), the light combining device (30) and the light source assembly are arranged in a one-to-one correspondence, and the light combining device (30) is arranged on the light output path of the corresponding light source assembly; a first corner prism (41) and a second corner prism (42), wherein the first corner prism (41) and the second corner prism (42) are respectively arranged on light output paths of the two light combining devices (30); a light splitting device (50), the light splitting device (50) being located between the first corner prism (41) and the second corner prism (42); A projection system, comprising a projection lens (60), the projection system being located between the two light source assemblies in a first direction, and the projection system being adjacent to and spaced from the light splitting device (50) in a second direction, the first direction being the optical axis direction of the projection lens (60), and the second direction being perpendicular to the first direction.

2. The projection display module according to claim 1, wherein: Each of the light source assemblies comprises a light source (10) and a light homogenizing device (20) located on a light output path of the light source (10); The light combining device (30) and the light homogenizing device (20) are arranged in a one-to-one correspondence; the light combining device (30) is located on the light output path of the corresponding light homogenizing device (20), and the two are arranged adjacent to each other.

3. The projection display module according to claim 2, wherein: The light source (10) is an all-in-one light source capable of emitting projection light of different wavelength bands; The light homogenizing device (20) comprises at least one of a super lens, a beam shaping lens and a CPC reflective bowl.

4. The projection display module according to claim 2 or 3, characterized in that: The projection display module further includes an optical waveguide device, wherein the optical waveguide device includes a waveguide substrate, and an incoupling region and an outcoupling region provided on the waveguide substrate; The coupling-in region is located on the light output path of the projection system, and is used to couple the light emitted by the projection system into the waveguide substrate and cause the light to be totally reflected in the waveguide substrate and propagate to the coupling-out region. The outcoupling region is used to outcouple the light propagating to the outcoupling region.

5. The projection display module according to claim 4, wherein: The coupling region includes a first coupling port (81) and a second coupling port (82); The outcoupling region includes a first coupling outlet (91) and a second coupling outlet (92); The light emitted by the projection system is divided into two paths for propagation: A portion of the light is coupled into the waveguide substrate through the first coupling inlet (81) and propagates to the first coupling outlet (91) by total reflection; another portion of the light is coupled into the waveguide substrate through the second coupling inlet (82) and propagates to the second coupling outlet (92) by total reflection; The first coupling port (91) is used to couple out light from the first coupling port (81), and the second coupling port (92) is used to couple out light from the second coupling port (82), so that the first coupling port (91) and the second coupling port (92) can respectively couple corresponding light into the left eye (01) and the right eye (02) of the user, thereby realizing binocular projection imaging.

6. The projection display module according to claim 4, characterized in that: The coupling-in region includes a third coupling port (83), and the coupling-out region includes a third coupling port (93); The light emitted from the projection system is directly coupled into the waveguide substrate through the third coupling port (83) and propagates to the third coupling port (93) by total reflection. The third coupling port (93) couples the light propagated to the third coupling port (93) out to the left eye (01) or the right eye (02) of the user.

7. The projection display module according to claim 4, wherein: The light combining device (30) comprises a first right-angle prism (31), a second right-angle prism (32), and a color combining prism (33); wherein the color combining prism (33) is located between the first right-angle prism (31) and the second right-angle prism (32); The first right-angle prism (31), the color combining prism (33), and the second right-angle prism (32) are glued together to form a whole, wherein a right-angled side of the first right-angle prism (31) is glued to a surface of the color combining prism (33), and a right-angled side of the second right-angle prism (32) is glued to a surface of the color combining prism (33).

8. The projection display module according to claim 4, wherein: The light splitting device (50) is glued between the first corner prism (41) and the second corner prism (42).

9. The projection display module according to claim 4, wherein: The light splitting device (50) comprises a first light splitting prism (51), a second light splitting prism (52) and a third light splitting prism (53); The third beam splitter prism (53) is located between the first beam splitter prism (51) and the second beam splitter prism (52), and the inclined surface of the first beam splitter prism (51) is glued to one right-angled surface of the third beam splitter prism (53), and the inclined surface of the second beam splitter prism (52) is glued to another right-angled surface of the third beam splitter prism (53), and the two glued surfaces are coated with or attached with a PBS film, and the PBS film can be used to transmit P-polarized light and reflect S-polarized light.

10. The projection display module according to claim 9, wherein: The projection system further comprises a projection chip (70), wherein the projection chip (70) is located on a side of the projection lens (60) facing away from the light splitting device (50).

11. The projection display module according to claim 10, wherein: The projection chip (70) includes an LCOS display chip or a DLP display chip.

12. The projection display module according to claim 10, wherein: S-polarized light emitted by one of the light sources (10) is beam-shaped and homogenized by a corresponding light homogenizing device (20) and then projected onto the light combining device (30) for beam combining. The combined light passes through the second corner prism (42), the second beam splitting prism (52) in the beam splitting device (50), and the projection lens (60) and is incident on the projection chip (70). The S-polarized light incident on the projection chip (70) is converted into P-polarized light and carries display image information and is sequentially emitted through the projection lens (60), the first beam splitting prism (51), and the third beam splitting prism (53) in the beam splitting device (50). The S-polarized light emitted by the other light source (10) is beam-shaped and homogenized by the corresponding light homogenizing device (20) and then projected to the light combining device (30) for beam combining. The combined light is incident on the projection chip (70) via the first corner prism (41), the first beam splitting prism (51) in the beam splitting device (50), and the projection lens (60). The S-polarized light incident on the projection chip (70) is converted into P-polarized light and carries display image information and is sequentially emitted via the projection lens (60), the second beam splitting prism (52), and the third beam splitting prism (53) in the beam splitting device (50).

13. A wearable device, characterized in that: include: shell; as well as The projection display module according to any one of claims 1 to 12, wherein the projection display module is disposed within the housing.

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