Projection display system and projection device

Abstract

The present application provides a projection display system and a projection device. The projection display system comprises a lighting module, a beam splitting prism set, and an imaging module, and the lighting module and the imaging module surround the peripheral side of the beam splitting prism set. The beam splitting prism set comprises a first beam splitting prism, a compensation prism, and a second beam splitting prism which are sequentially cemented; a first beam splitting film is provided between cementing surfaces of the first beam splitting prism and the compensation prism, one non-cementing surface of the first beam splitting prism is adjacent to the lighting module, and the other non-cementing surface of the first beam splitting prism is locally provided with a total reflection film; and a second beam splitting film is provided between cementing surfaces of the second beam splitting prism and the compensation prism, one non-cementing surface of the second beam splitting prism is provided with a phase retarder, and the total reflection film and the phase retarder are arranged opposite to each other. According to the projection display system in the present application, a relay part is omitted, and the overall structure is more compact.

Description

Projection display system and projection device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 17, 2023, with application number 202311038707.7 and invention name “A projection display system and projection device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of optical display technology, and more specifically, to a projection display system and a projection device. Background Art

[0003] With advancements in imaging technology, consumers are increasingly demanding immersive experiences. Recent developments in VR / AR technology are gradually satisfying this demand for visual experiences. Head-mounted devices (HMDs) free up hands, reduce screen reliance, and create enhanced visual experiences. Near-eye display (NED) is a key technology for HMDs, with image quality and thinness being key considerations.

[0004] Existing AR (Augmented Reality) devices based on diffractive waveguides primarily utilize displays such as LCOS (Liquid Crystal on Silicon) or DLP. However, the passive illumination of DLP and LCOS optical systems results in a large projection system, hindering the miniaturization and thinness of AR products.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a new technical solution for a projection display system and a projection device.

[0007] In a first aspect, an embodiment of the present application provides a projection display system. The projection display system includes an illumination module, a beam splitter group, and an imaging module, wherein the illumination module and the imaging module are arranged around the beam splitter group;

[0008] The beam splitter assembly includes a first beam splitter prism, a compensation prism and a second beam splitter prism glued together in sequence;

[0009] A first beam splitter film is provided between the bonding surfaces of the first beam splitter prism and the compensation prism, one non-bonded surface of the first beam splitter prism is provided adjacent to the illumination module, and a total reflection film is partially provided on the other non-bonded surface of the first beam splitter prism;

[0010] A second beam splitter film is provided between the bonding surfaces of the second beam splitter prism and the compensation prism. A phase retarder is provided on a non-bonded surface of the second beam splitter prism. The total reflection film is arranged opposite to the phase retarder.

[0011] Optionally, the first beam splitter prism includes a first surface, a second surface, and a third surface connected to the first surface and the second surface, the illumination module is disposed adjacent to the first surface, the second surface is glued to one surface of the compensation prism, and the total reflection film is disposed on the third surface;

[0012] The second beam splitter prism includes a fourth surface and a fifth surface, and a sixth surface connected to the fourth surface and the fifth surface, the fourth surface is glued to the other surface of the compensation prism, the fifth surface is opposite to the third surface, and the phase retarder is provided on the fifth surface;

[0013] The imaging module is arranged adjacent to the third surface, the fifth surface and the sixth surface.

[0014] Optionally, a polarizer is provided between the first surface and the lighting module.

[0015] Optionally, the first surface and / or the second surface is an arc-shaped surface.

[0016] Optionally, the first surface and the second surface are planes, and lenses are provided on the first surface and / or the second surface.

[0017] Optionally, the first surface and the second surface are both planes.

[0018] Optionally, a polarizer is provided on the first surface.

[0019] Optionally, the imaging module includes a first lens group, a second lens group, a third lens group and an LCOS display chip;

[0020] The first lens group is adjacent to the third surface, and the LCOS display chip is located on a side of the first lens group facing away from the third surface;

[0021] The second lens group is adjacent to the fifth surface;

[0022] The third lens group is adjacent to the sixth surface.

[0023] Optionally, a reflective film is provided on a side of the second lens group away from the LCOS display chip.

[0024] Optionally, the lighting module emits S light and projects the S light onto the first surface, which is totally reflected by the third surface and incident on the second surface. The first dichroic film can reflect the S light and transmit the P light at the same time. The S light is reflected by the second surface, passes through the third surface and the first lens group and is incident on the LCOS display chip. The LCOS display chip modulates the S light into P light, and carries the display screen information and passes through the first lens group, the compensation prism, the second dichroic prism, the phase delay device and the second lens group again. The second lens group has a reflection function. The P light reflected from the LCOS display chip is modulated into circularly polarized light when it passes through the phase delay device for the first time. After the circularly polarized light is incident on the second lens group, it is reflected and modulated into S light after passing through the phase delay device again. The S light is reflected by the second dichroic film and then emitted through the third lens group.

[0025] Optionally, the compensation prism includes a seventh surface glued to the first beam splitter prism, and an eighth surface glued to the second beam splitter prism;

[0026] After the light reflected by the LCOS display chip passes through the seventh surface and the eighth surface, the light can be refracted and compensated for the angle so that the light is vertically projected onto the second lens group.

[0027] Optionally, the lighting module includes a lighting light source, and the lighting light source is located on one side of the first surface, and the light emitted by the lighting light source can be vertically incident on the first surface.

[0028] Optionally, the lighting module consists of a lighting light source and a corner prism;

[0029] The corner prism is located between the illumination light source and the first surface, and is used to receive the light emitted by the illumination light source and deflect the light so that it is vertically incident on the first surface.

[0030] In a second aspect, an embodiment of the present application provides a projection device. The projection device includes:

[0031] shell;

[0032] The projection display system according to the first aspect; and

[0033] An optical waveguide device, comprising a coupling inlet and a coupling outlet;

[0034] The imaging light emitted from the projection display system is projected onto the coupling port, and the imaging light propagates in the optical waveguide device to the coupling port for coupling out.

[0035] The beneficial effects of this application are:

[0036] The projection optical system provided in the embodiments of the present application incorporates a beam splitter assembly consisting of three cemented prisms between the illumination module and the imaging module. Furthermore, by employing a catadioptric optical path, the size of the relay portion of the illumination optical path is significantly reduced, and the relay portion can even be eliminated entirely. The projection optical system provided in the embodiments of the present application can reduce the size of the projection display system, improve its overall performance, and facilitate the miniaturization and lightweight design of subsequent projection equipment.

[0037] 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

[0038] 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.

[0039] FIG1 is a schematic diagram of a projection optical system according to an embodiment of the present invention;

[0040] FIG2 is a second structural schematic diagram of a projection optical system provided in an embodiment of the present application;

[0041] FIG3 is a third structural diagram of the projection optical system provided in an embodiment of the present application;

[0042] FIG4 is a fourth structural schematic diagram of the projection optical system provided in an embodiment of the present application;

[0043] FIG5 is a fifth structural diagram of the projection optical system provided in an embodiment of the present application.

[0044] Description of reference numerals:

[0045] 10. Illumination light source; 20. Corner prism; 30. First beam splitter prism; 301. First surface; 302. Second surface; 303. Third surface; 31. Lens; 40. Polarizer; 50. Compensating prism; 501. Seventh surface; 502. Eighth surface; 60. Second beam splitter prism; 601. Fourth surface; 602. Fifth surface; 603. Sixth surface; 71. First lens group; 72. Second lens group; 73. Third lens group; 74. LCOS display chip; 81. First beam splitter film; 82. Second beam splitter film; 90. Phase retarder. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] The projection display system and projection device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0052] According to one embodiment of the present application, a projection display system is provided, which can be applied to a projection device to project light with image information into a picture. The projection device here is, for example, an AR projection device (Head mounted display, HMD).

[0053] According to the projection display system provided in the embodiment of the present application, referring to Figures 1 to 5, the projection display system includes an illumination module, a beam splitter group, and an imaging module, and the illumination module and the imaging module are arranged around the beam splitter group. The beam splitter group includes a first beam splitter prism 30, a compensation prism 50, and a second beam splitter prism 60, which are glued together in sequence. A first beam splitter film 81 is provided between the glued surfaces of the first beam splitter prism 30 and the compensation prism 50. One non-glued surface of the first beam splitter prism 30 is arranged adjacent to the illumination module, and a total reflection film is partially provided on the other non-glued surface of the first beam splitter prism 30. A second beam splitter film 82 is provided between the glued surfaces of the second beam splitter prism 60 and the compensation prism 50. A phase retarder 90 is provided on one non-glued surface of the second beam splitter prism 60, and the total reflection film is arranged opposite to the phase retarder 90.

[0054] The beamsplitter assembly proposed in the aforementioned embodiments of this application is primarily composed of a first beamsplitter prism 30, a compensating prism 50, and a second beamsplitter prism 60, which are glued together (see Figure 1). The resulting beamsplitter assembly, combined with a catadioptric optical path, significantly reduces the length and volume of the relay portion of the illumination light path, particularly eliminating the need for a relay portion. Light emitted by the illumination module is directly projected into the beamsplitter assembly, which then transmits it to the imaging module.

[0055] From the optical architecture shown in Figure 1, the illumination module and the imaging module are arranged around the beam splitter assembly, resulting in a compact overall layout. For example, the illumination module is located on one side of the beam splitter assembly, while the imaging module is arranged on the remaining three sides of the beam splitter assembly.

[0056] The optical architecture used in the embodiments of the present application is beneficial for reducing the volume of the projection display system, improving the overall performance of the system, and facilitating the miniaturization and lightweight design of subsequent projection equipment.

[0057] According to the projection optical system provided in the above embodiment, the illumination module is used to emit light, which can be projected onto the beam splitter assembly. The beam splitter assembly can directly converge the light into the imaging module, which then projects an image modulated by, for example, an LCOS chip to infinity via an imaging optical path, allowing the user to see the projected image. No relay components are introduced in the entire system.

[0058] The lighting module may be a monochromatic light source or a multi-color light source, which is not limited in this application.

[0059] Referring to Figure 1 , a first beam splitter film 81 is disposed between the bonding surfaces of the first beam splitter prism 30 and the compensating prism 50. A second beam splitter film 82 is disposed between the bonding surfaces of the second beam splitter prism 60 and the compensating prism 50. Both the first beam splitter film 81 and the second beam splitter film 82 transmit P-polarized light and reflect S-polarized light. Furthermore, a total reflection film is disposed on the first beam splitter prism 30, and a phase retarder 90 is disposed on the second beam splitter prism 60. This ensures that light entering the beam splitter assembly forms a catadioptric optical path.

[0060] The projection display system provided in the embodiment of the present application is suitable for the LCOS projection optical solution, and in particular, can further compress the volume of the projection optical system based on the LCOS projection optical solution.

[0061] According to the projection optical system provided in an embodiment of the present application, as shown in Figure 1, a special-shaped beam splitter assembly consisting of three glued prisms is introduced between the illumination module and the imaging module. This can reduce the size of the relay portion of the illumination light path through a catadioptric optical path, even eliminating the need for a relay lens. The projection optical system provided in an embodiment of the present application can significantly reduce the size of the projection display system, improve its overall performance, and facilitate the miniaturization and lightweight design of subsequent projection equipment.

[0062] According to some examples of the present application, as shown in FIG1 , the first beam splitter prism 30 includes a first surface 301, a second surface 302, and a third surface 303 connected to the first surface 301 and the second surface 302. The illumination module is disposed adjacent to the first surface 301, the second surface 302 is glued to one surface of the compensation prism 50, and the total reflection film is disposed on the third surface 303.

[0063] The second beam splitter prism 60 includes a fourth surface 601 and a fifth surface 602, and a sixth surface 603 connected to the fourth surface 601 and the fifth surface 602. The fourth surface 601 is glued to the other surface of the compensation prism 50. The fifth surface 602 is opposite to the third surface 303, and the phase retarder 90 is arranged on the fifth surface 602. The imaging module is arranged adjacent to the third surface 303, the fifth surface 602 and the sixth surface 603.

[0064] According to the above embodiment, both the first beam splitter prism 30 and the second beam splitter prism 60 are triangular prisms, each having three faces.

[0065] Specifically, referring to Figure 1 , the first surface 301 of the first beam splitter prism 30 faces the illumination module and serves as the light incident side of the beam splitter assembly. The second surface 302 of the first beam splitter prism 30 is glued to one surface of the compensation prism 50, with the first beam splitter film 81 disposed therebetween. A total reflection film may be partially disposed on the third surface 303 of the first beam splitter prism 30, so that light incident on the third surface 303 is totally reflected. Furthermore, the third surface 303 may also serve as a transmission side of the beam splitter assembly, for example, defined as the first transmission side of the beam splitter assembly.

[0066] On this basis, the light passing through the first surface 301 can be totally reflected by the third surface 303 to the second surface 302; wherein, the S-polarized light is reflected and passes through the third surface 303, and the P-polarized light is transmitted into the compensation prism 50, see Figure 1.

[0067] Continuing with Figure 1 , the fourth surface 601 of the second beam-splitting prism 60 is glued to the other side of the compensation prism 50, with a second beam-splitting film 82 disposed therebetween. The fifth surface 602 of the second beam-splitting prism 60 can form the other transmissive side of the beam-splitting assembly, for example, defined as the second transmissive side. Here, the fifth surface 602 is opposite the third surface 303. The sixth surface 603 of the second beam-splitting prism 60 can form the exit surface of the beam-splitting assembly. For example, S-polarized light reflected by the second beam-splitting film 82 can be emitted through the sixth surface 603.

[0068] According to the above example, referring to FIG1 , for the beam splitter assembly, the first surface 301 of the first beam splitter prism 30 forms the light incident side of the beam splitter assembly, and the third surface 303 thereof forms the first transmission side of the beam splitter assembly. The fifth surface 602 of the second beam splitter prism 60 forms the second transmission side of the beam splitter assembly, and the sixth surface 603 thereof forms the emission side of the beam splitter assembly.

[0069] In some examples of the present application, a polarizer 40 is provided between the first surface 301 and the lighting module.

[0070] The light incident on the beam splitter group should be S-polarized light. Therefore, a polarizer (POL) 40 can be selectively introduced between the first surface 301 and the illumination module to convert external light, such as natural light, incident on the beam splitter group into S-polarized light.

[0071] That is, the polarizer 40 can transform the light emitted by the illumination module into S-polarized light (ie, S light) with polarization characteristics.

[0072] Of course, the polarizer 40 can also be provided in the lighting module.

[0073] In some examples of the present application, the first surface 301 and / or the second surface 302 is an arc-shaped surface.

[0074] In one example, referring to FIG. 1 , both the first surface 301 and the second surface 302 of the first beam splitter prism 30 are configured as arc-shaped surfaces.

[0075] According to the above example, the first surface 301 and the second surface 302 of the first beam splitter prism 30 each have a certain refractive power. Such a design can greatly improve the light collection capability of the system and the performance of the entire projection display system, and the relay lens can be completely omitted in the system.

[0076] The solution shown in FIG1 is to directly process the first surface 301 and the second surface 302 of the first beam splitter prism 30 into a certain surface shape so as to give it a certain optical power. The first beam splitter prism 30 formed in this way has a good overall appearance.

[0077] Of course, either the first surface 301 or the second surface 302 can be designed as a curved surface according to actual needs, and this is not limited in the present application.

[0078] Optionally, the aforementioned polarizer 40 may be provided on the first surface 301 .

[0079] In some examples of the present application, referring to FIG. 2 to FIG. 4 , the first surface 301 and the second surface 302 are planes, and a lens 31 is provided on the first surface 301 and / or the second surface 302 .

[0080] To impart a certain optical power to the first beam splitter prism 30, its first surface 301 and / or second surface 302 can be directly processed into curved surfaces. However, this is technically difficult. Alternatively, a lens can be mounted on a flat surface to impart a certain optical power to the first surface 301 and / or second surface 302.

[0081] In one example, referring to FIG. 2 , the first surface 301 and the second surface 302 of the first beam splitter prism 30 are both planes, and lenses 31 are glued onto the first surface 301 and the second surface 302 , respectively.

[0082] According to the above example, referring to FIG2 , the first beam splitter prism 30 can be given a certain optical power by the lens 31. Compared with the solution shown in FIG1 , this approach can reduce the difficulty of manufacturing the first beam splitter prism 30.

[0083] It should be noted that the lens surface shapes provided on the first surface 301 and the second surface 302 may be the same or different, and this is not limited in the present application.

[0084] Optionally, the polarizer 40 mentioned above can be disposed on the first surface 301, as shown in Figure 3. In this case, since the first surface 301 is a plane, attaching the polarizer 40 to the plane can reduce the difficulty of attaching the film.

[0085] In one example, referring to FIG. 4 , both the first surface 301 and the second surface 302 of the first beam splitter prism 30 are planes, and only the lens 31 is glued onto the first surface 301 .

[0086] According to the above example, only the first surface 301 has a certain optical power.

[0087] Optionally, the polarizer 40 mentioned above can be disposed on the first surface 301, as shown in Figure 4. In this case, since the first surface 301 is a plane, attaching the polarizer 40 to the plane can reduce the difficulty of attaching the film.

[0088] 4 , which differs from FIG. 3 in that a lens of a predetermined surface shape is glued only on the first surface 301 of the first beam splitter prism 30 , and the second surface 302 is a plane without optical power.

[0089] In some examples of the present application, referring to FIG. 5 , both the first surface 301 and the second surface 302 are planes.

[0090] According to the above example, the first surface 301 and the second surface 302 of the first beam splitter prism 30 may also not have optical power, that is, both may be flat surfaces.

[0091] Optionally, the aforementioned polarizer 40 may be provided on the first surface 301 , see FIG. 5 .

[0092] It should be noted that the optical power of the first surface 301 and the second surface 302 can be adjusted as needed, and this is not limited in the embodiment of the present application.

[0093] According to the above three examples, when the polarizer 40 needs to be introduced, the polarizer 40 can be disposed on the first surface 301 of the first beam splitter prism 30 .

[0094] In particular, when the first surface 301 is a plane, disposing a polarizer 40 on the surface thereof can reduce the difficulty of assembly.

[0095] According to some examples of the present application, referring to Figures 1 to 5, the imaging module includes a first lens group 71, a second lens group 72, a third lens group 73 and an LCOS display chip 74; the first lens group 71 is adjacent to the third surface 303, and the LCOS display chip 74 is located on the side of the first lens group 71 away from the third surface 303; the second lens group 72 is adjacent to the fifth surface 602; and the third lens group 73 is adjacent to the sixth surface 603.

[0096] The projection display system proposed in the embodiment of the present application can form a more miniaturized LCOS optical architecture as a whole.

[0097] According to the above example, the imaging module includes multiple lenses and an LCOS display chip 74; the multiple lenses include the above-mentioned first lens group 71, second lens group 72 and third lens group 73, and the three lens groups are arranged on three sides of the spectrometer group with a compact layout, and the spectrometer module is located between the imaging light paths of the imaging module.

[0098] The lenses included in the first lens group 71 , the second lens group 72 and the third lens group 73 may be made of glass, for example, which can improve the temperature resistance of the imaging module.

[0099] Among them, the first lens group 71 is placed between the first light-transmitting side of the spectrometer group and the LCOS display chip 74. The first lens group 71 can correct distortion and spherical aberration, which is beneficial to improving the imaging quality.

[0100] The second lens assembly 72, for example, comprises a single lens having two surfaces: a first surface and a second surface. The first surface is located adjacent to the second light-transmitting side of the beam splitter assembly, while the second surface is located distal from the beam splitter assembly. A phase retarder 90 is disposed between the first surface and the beam splitter assembly. The phase retarder 90 is a quarter-wave plate. The first surface forms a transmissive surface, while the second surface forms a reflective surface. Furthermore, usable projection light entering the beam splitter assembly can pass through the phase retarder 90. In this case, the light first passes through the phase retarder 90, then passes through the first surface, and then is reflected back to the phase retarder 90 by the second surface. This second pass through the phase retarder 90 causes the polarization direction of the usable projection light to rotate by 90°. After being reflected by the beam splitter assembly, the light then exits and passes through the third lens assembly 73, allowing the user to view the image.

[0101] Optionally, a reflective film is provided on a side of the second lens group 72 away from the LCOS display chip 74 .

[0102] The reflective film may be, for example, a highly reflective film, which can improve reflectivity. The design based on the folded optical path can also improve the optical performance of the module.

[0103] According to the projection display system provided by the embodiment of the present application, referring to Figures 1 to 5, the illumination module emits S light and projects the S light onto the first surface 301, which is totally reflected by the third surface 303 and incident on the second surface 302. The first beam splitter film 81 can reflect the S light and transmit the P light at the same time. The S light is reflected by the second surface 302, passes through the third surface 303 and the first lens group 71, and is incident on the LCOS display chip 74. The LCOS display chip 74 modulates the S light into P light and carries the display image information to the display chip 74. The P light reflected from the LCOS display chip 74 passes through the first lens group 71, the compensation prism 50, the second dichroic prism 60, the phase retarder 90 and the second lens group 72. The second lens group 72 has a reflection function. The P light reflected from the LCOS display chip 74 is modulated into circularly polarized light when it passes through the phase retarder 90 for the first time. After the circularly polarized light enters the second lens group 72, it is reflected and modulated into S light after passing through the phase retarder 90 again. The S light is reflected by the second dichroic film 82 and then emitted through the third lens group 73.

[0104] In some examples of the present application, referring to FIG1 , the compensation prism 50 includes a seventh surface 501 bonded to the first beam splitter prism 30 and an eighth surface 502 bonded to the second beam splitter prism 60; the light reflected by the LCOS display chip 74 can be compensated for its deflection angle after passing through the seventh surface 501 and the eighth surface 502 so that the light is projected vertically onto the second lens group 72.

[0105] According to the above example of the present application, a compensating prism 50 is introduced between the first beam splitter prism 30 and the second beam splitter prism 60. The compensating prism 50 can compensate for the angular difference in light propagation between the first beam splitter prism 30 and the second beam splitter prism 60. In this way, light reflected by the LCOS display chip 74 can be projected perpendicularly to the second lens assembly 72 after passing through the beam splitter assembly, thereby improving the final projection image quality.

[0106] In some examples of the present application, the lighting module includes a lighting light source 10 , which is located on one side of the first surface 301 , and light emitted by the lighting light source 10 can be vertically incident on the first surface 301 .

[0107] In some examples of the present application, the lighting module is composed of an illumination light source 10 and a corner prism 20; wherein the corner prism 20 is located between the illumination light source 10 and the first surface 301, and the corner prism 20 is used to receive the light emitted by the illumination light source 10 and deflect the light so that it is vertically incident on the first surface 301.

[0108] Based on the two examples above, the illumination light source 10 can be designed for vertical incidence without the need for a corner prism 20. This can eliminate the need for a corner prism, saving costs, but may increase the system volume and length. Using a corner prism can help reduce the system volume and length.

[0109] According to another embodiment of the present application, a projection device is provided. The projection device includes a housing, the projection display system described above, and an optical waveguide device. The optical waveguide device includes a coupling inlet and a coupling outlet. Imaging light emitted by the projection display system is projected onto the coupling inlet, propagates through the optical waveguide device, and is coupled out through the coupling outlet.

[0110] The projection device in the above embodiment is, for example, an AR-based projection device, such as AR glasses or an AR helmet, etc. The specific form of the projection device in the embodiment of the present application is not limited to this.

[0111] It should be noted that the projection display system provided in the embodiment of the present application can also be used in other types of projection equipment, such as vehicle-mounted projection equipment, home projection equipment, etc., including but not limited to the above-mentioned projection equipment.

[0112] The specific implementation of the projection device provided in the embodiment of the present application can refer to the various embodiments of the above-mentioned optical lighting module and projection display system, and therefore has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0113] 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.

Claims

1. A projection display system, characterized in that: It comprises an illumination module, a beam splitter group and an imaging module, wherein the illumination module and the imaging module are arranged around the beam splitter group; The beam splitter group comprises a first beam splitter prism (30), a compensation prism (50) and a second beam splitter prism (60) which are glued together in sequence; A first beam splitter film (81) is arranged between the bonding surfaces of the first beam splitter prism (30) and the compensation prism (50), a non-bonded surface of the first beam splitter prism (30) is arranged adjacent to the lighting module, and a total reflection film is partially arranged on another non-bonded surface of the first beam splitter prism (30); A second beam splitter film (82) is arranged between the bonding surfaces of the second beam splitter prism (60) and the compensation prism (50), a phase retarder (90) is arranged on a non-bonded surface of the second beam splitter prism (60), and the total reflection film and the phase retarder (90) are arranged opposite to each other.

2. The projection display system according to claim 1, characterized in that: The first beam splitter prism (30) comprises a first surface (301) and a second surface (302), and a third surface (303) connected to the first surface (301) and the second surface (302); the lighting module is arranged adjacent to the first surface (301); the second surface (302) is glued to one surface of the compensation prism (50); and the total reflection film is arranged on the third surface (303); The second beam splitter prism (60) comprises a fourth surface (601) and a fifth surface (602), and a sixth surface (603) connected to the fourth surface (601) and the fifth surface (602), the fourth surface (601) is glued to another surface of the compensation prism (50), the fifth surface (602) is opposite to the third surface (303), and the phase retarder (90) is arranged on the fifth surface (602); The imaging module is arranged adjacent to the third surface (303), the fifth surface (602) and the sixth surface (603).

3. The projection display system according to claim 2, characterized in that: A polarizer (40) is arranged between the first surface (301) and the lighting module.

4. The projection display system according to claim 3, characterized in that: The first surface (301) and / or the second surface (302) are arc-shaped surfaces.

5. The projection display system according to claim 3, characterized in that: The first surface (301) and the second surface (302) are planes, and a lens (31) is arranged on the first surface (301) and / or the second surface (302).

6. The projection display system according to claim 3, characterized in that: The first surface (301) and the second surface (302) are both planes.

7. The projection display system according to any one of claims 4 to 6, characterized in that: The polarizer (40) is arranged on the first surface (301).

8. The projection display system according to claim 7, characterized in that: The imaging module comprises a first lens group (71), a second lens group (72), a third lens group (73) and an LCOS display chip (74); The first lens group (71) is adjacent to the third surface (303), and the LCOS display chip (74) is located on a side of the first lens group (71) facing away from the third surface (303); The second lens group (72) is adjacent to the fifth surface (602); The third lens group (73) is adjacent to the sixth surface (603).

9. The projection display system according to claim 8, characterized in that: A reflective film is provided on a side of the second lens group (72) away from the LCOS display chip (74).

10. The projection display system according to claim 9, characterized in that: The lighting module emits S light and projects the S light onto the first surface (301), and the S light is totally reflected by the third surface (303) and incident on the second surface (302). The first beam splitter film (81) can reflect the S light and transmit the P light. The S light is reflected by the second surface (302), passes through the third surface (303) and the first lens group (71), and is incident on the LCOS display chip (74). The LCOS The display chip (74) modulates the S light into P light, and carries the display picture information and passes through the first lens group (71), the compensation prism (50), the second beam splitter prism (60), the phase retarder (90) and the second lens group (72) again. The second lens group (72) has a reflection function. The P light reflected from the LCOS display chip (74) is modulated into circularly polarized light when passing through the phase retarder (90) for the first time. The circularly polarized light is incident on the second lens group (72) and is reflected and modulated into S light after passing through the phase retarder (90) again. The S light is reflected by the second beam splitter film (82) and then emitted through the third lens group (73).

11. The projection display system according to claim 9, characterized in that: The compensation prism (50) comprises a seventh surface (501) glued to the first beam splitter prism (30), and an eighth surface (502) glued to the second beam splitter prism (60); After the light reflected by the LCOS display chip (74) passes through the seventh surface (501) and the eighth surface (502), the light can be refracted at an angle compensated so that the light is vertically projected onto the second lens group (72).

12. The projection display system according to claim 9, characterized in that: The lighting module comprises a lighting light source (10), wherein the lighting light source (10) is located on one side of the first surface (301), and light emitted by the lighting light source (10) can be vertically incident on the first surface (301).

13. The projection display system according to claim 9, characterized in that: The lighting module is composed of a lighting light source (10) and a corner prism (20); The corner prism (20) is located between the illumination light source (10) and the first surface (301), and is used to receive light emitted by the illumination light source (10) and to deflect the light so that it is vertically incident on the first surface (301).

14. A projection device, characterized in that: include: shell; The projection display system according to any one of claims 1 to 13; as well as, An optical waveguide device, the optical waveguide device comprising a coupling inlet and a coupling outlet; The imaging light emitted by the projection display system is projected onto the coupling port, and the imaging light propagates in the optical waveguide device to the coupling port for coupling out.

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