Projection device

Abstract

The utility model relates to the technical field of projection devices, and discloses a projection device. The projection device provided by the utility model comprises a light source, a polarization light splitting part, a first reflecting mirror, a first LCD module, a second reflecting mirror, a second LCD module and a polarization light combining part, the polarization light splitting part is used for receiving an incident light beam and splitting the incident light beam into a first light beam and a second light beam which are different in polarization direction and emergent direction, the first reflector receives and reflects the first light beam so as to adjust the light path of the first light beam, and the first LCD module receives and outputs the first light beam; the second reflector receives and reflects the second light beam to adjust the light path of the second light beam, and the second LCD module receives and outputs the second light beam; the polarization light combination part is used for combining the first light beam and the second light beam into an output light beam and outputting the output light beam. According to the projection module provided by the invention, the polarization light splitting and combining system is provided, and the technical problem of low light source utilization rate of a projection device in the related technology is solved.

Description

Technical Field

[0001] The present application relates to the technical field of projection devices, and in particular to a projection device. Background Art

[0002] An LCD (Liquid Crystal Display) projection device is a device that uses liquid crystal technology to project images onto a screen or other surface.

[0003] Single-chip LCD projection devices are widely used in various occasions due to their small size, high portability, low cost, and easy installation. Traditional single-chip LCD projection devices are equipped with polarizing films before and after the LCD screen, and the front polarizing film will filter out 50% of the incident light, resulting in low light source utilization, affecting the brightness and image quality of the projection device. Utility Model Content

[0004] The purpose of the present application is to provide a projection device for solving the technical problem of low light source utilization rate of LCD projection devices in the related art.

[0005] In order to solve the above problems, the present application provides a projection device, comprising:

[0006] a light source, for emitting an incident light beam;

[0007] a polarization beam splitter, disposed on a light-emitting side of the light source, for receiving the incident light beam and for splitting the incident light beam into a first light beam and a second light beam having different polarization directions and different emission directions;

[0008] a first reflector and a first LCD module, wherein the first reflector and the first LCD module are arranged at a first light-emitting side of the polarization beam splitter, the first reflector is used to receive and reflect the first light beam to adjust the light path of the first light beam, and the first LCD module is used to receive and output the first light beam;

[0009] a second reflector and a second LCD module, wherein the second reflector and the second LCD module are arranged at a second light-emitting side of the polarization beam splitter, the second reflector is used to receive and reflect the second light beam to adjust the light path of the second light beam, and the second LCD module is used to receive and output the second light beam;

[0010] The polarized light combiner is arranged on the light output side of the first LCD module and the second LCD module, and is used to combine the first light beam and the second light beam into an output light beam and output the output light beam.

[0011] In one embodiment, the polarization beam splitter comprises a cube beam splitter or a flat beam splitter; and / or the polarization beam combiner comprises a cube beam splitter or a flat beam splitter.

[0012] In one embodiment, the angle between the polarization plane of the polarization beam splitter and the incident light beam is in the range of 25°-65°.

[0013] In one embodiment, the angle between the polarization plane of the polarization beam splitter and the incident light beam is 45°, and the polarization plane of the polarization light combiner, the reflection plane of the first reflector, and the reflection plane of the second reflector are all parallel to the polarization plane of the polarization beam splitter.

[0014] In one embodiment, the first reflector is arranged on the first light output side of the polarization beam splitter, and the first reflector is used to receive and reflect the first light beam output by the polarization beam splitter; the first LCD module is arranged on the light output side of the first reflector, and the first LCD module is used to receive and output the first light beam reflected by the first reflector.

[0015] In one embodiment, the first LCD module is arranged on the first light output side of the polarization beam splitter, and the first LCD module is used to receive and output the first light beam output by the polarization beam splitter; the first reflector is arranged on the light output side of the first LCD module, and the first reflector is used to receive and reflect the first light beam output by the first LCD module.

[0016] In one embodiment, the second reflector is arranged on the second light output side of the polarization beam splitter, and the second reflector is used to receive and reflect the second light beam output by the polarization beam splitter; the second LCD module is arranged on the light output side of the second reflector, and the second LCD module is used to receive and output the second light beam reflected by the second reflector.

[0017] In one embodiment, the second LCD module is arranged on the second light output side of the polarization beam splitter, and the second LCD module is used to receive and output the second light beam output by the polarization beam splitter; the second reflector is arranged on the light output side of the second LCD module, and the second reflector is used to receive and reflect the second light beam output by the second LCD module.

[0018] In one embodiment, the first LCD module includes a first polarizer and a first LCD screen that are relatively arranged, and the first polarizer is arranged on the light incident side of the first LCD screen; the second LCD module includes a second polarizer and a second LCD screen that are relatively arranged, and the second polarizer is arranged on the light incident side of the second LCD screen.

[0019] In one embodiment, the first LCD module includes a first polarizer, a first phase difference plate and a first LCD screen, the first polarizer and the first LCD screen are both arranged opposite to the first phase difference plate, the first polarizer is arranged on the light incident side of the first phase difference plate, and the first LCD screen is arranged on the light exit side of the first phase difference plate; the second LCD module includes a second polarizer, a second phase difference plate and a second LCD screen, the second polarizer and the second LCD screen are both arranged opposite to the second phase difference plate, the second polarizer is arranged on the light incident side of the second phase difference plate, and the second LCD screen is arranged on the light exit side of the second phase difference plate.

[0020] The projection device provided by the present application is provided with a polarization beam splitter on the light output side of the light source, a first reflector and a first LCD module on the first light output side of the polarization beam splitter, a second reflector and a second LCD module on the second light output side of the polarization beam splitter, and a polarization light combiner on the light output side of the first LCD module and the second LCD module. When in use, the polarization beam splitter is used to separate the light of different polarization directions in the incident light beam into a first light beam and a second light beam, so that the first light beam and the second light beam are respectively incident on the first LCD module and the second LCD module, and the first reflector and the second reflector are used to change the optical path of the first light beam and the second light beam, so that the first light beam and the second light beam can converge to the polarization light combiner for merging. In this way, by providing a polarization beam splitting and light combining system, a new optical path structure is formed, which can reasonably utilize the light beams of different polarization directions in the light source, effectively improve the utilization rate of the light source, and improve the brightness of the projection device; and by improving the utilization rate of the light source, it is also possible to improve the heating problem of the projection device, improve the use effect of the projection device and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a projection device provided in Embodiment 1 of the present application;

[0023] Figure 2 A schematic diagram of the structure of a projection device provided in Embodiment 2 of the present application;

[0024] Figure 3 This is a schematic diagram of the structure of the projection device provided in Example 3 of the present application.

[0025] Description of main component symbols:

[0026] 1. Light source; 11. Incident light beam; 12. First light beam; 13. Second light beam; 14. Output light beam; 2. Polarization beam splitter; 3. First reflector; 4. First LCD module; 41. First polarizer; 42. First LCD screen; 43. First phase difference plate; 5. Second reflector; 6. Second LCD module; 61. Second polarizer; 62. Second LCD screen; 63. Second phase difference plate; 7. Polarization beam combiner; 8. Lens; 9. Beam uniformity and shaping system. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly or indirectly disposed on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] References to "one embodiment", "some embodiments" or "an embodiment" described in the specification of this application mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some other embodiments", "in some other embodiments", etc., which appear at different places in this specification, do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. In addition, in one or more embodiments, particular features, structures or characteristics may be combined in any suitable manner.

[0030] The present application provides a projection device, which can improve the utilization rate of the light source by improving the internal light path design, thereby significantly improving the brightness of the projection device.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, the projection device provided in this embodiment includes a light source 1, a polarization beam splitter 2, a first reflector 3, a first LCD module 4, a second reflector 5, a second LCD module 6, and a polarization light combiner 7. The light source 1 is used to emit an incident light beam 11. The polarization beam splitter 2 is arranged on the light-emitting side of the light source 1, and the polarization beam splitter 2 is used to receive the incident light beam 11 and to split the incident light beam 11 into a first light beam 12 and a second light beam 13 with different polarization directions and different emission directions. The first reflector 3 and the first LCD module 4 are arranged on the first light-emitting side of the polarization beam splitter 2, and the first reflector 3 is used to receive and reflect the first light beam 12 to adjust the optical path of the first light beam 12, and the first LCD module 4 is used to receive and output the first light beam 12. The second reflector 5 and the second LCD module 6 are arranged on the second light-emitting side of the polarization beam splitter 2, and the second reflector 5 is used to receive and reflect the second light beam 13 to adjust the optical path of the second light beam 13, and the second LCD module 6 is used to receive and output the second light beam 13. The polarized light combining element 7 is disposed on the light output side of the first LCD module 4 and the second LCD module 6 , and is used to combine the first light beam 12 and the second light beam 13 into an output light beam 14 and output the output light beam 14 .

[0033] The first light beam 12 and the second light beam 13 propagate along different paths, the first light beam 12 can reach the first reflector 3 and the first LCD module 4, and the second light beam 13 can reach the second reflector 5 and the second LCD module 6. The first reflector 3 and the second reflector 5 can reflect light, thereby adjusting the emission directions of the first light beam 12 and the second light beam 13, so that the first light beam 12 and the second light beam 13 can converge on the polarization light combiner 7. The first LCD module 4 and the second LCD module 6 can transmit light and are used to generate images.

[0034] The relative positions of the first reflector 3 and the first LCD module 4, and the relative positions of the second reflector 5 and the second LCD module 6 are not unique and can be specifically designed according to actual conditions.

[0035] It should be noted that the image information carried by the first light beam 12 output by the first LCD module 4 is different from that carried by the first light beam 12 output by the polarization splitter 2, and the polarization directions may be the same or different; the image information carried by the second light beam 13 output by the second LCD module 6 is different from that carried by the second light beam 13 output by the polarization splitter 2, and the polarization directions may be the same or different.

[0036] The projection device provided in the present application is provided with a polarization beam splitter 2 on the light output side of the light source 1, a first reflector 3 and a first LCD module 4 are provided on the first light output side of the polarization beam splitter 2, a second reflector 5 and a second LCD module 6 are provided on the second light output side of the polarization beam splitter 2, and a polarization light combiner 7 is provided on the light output side of the first LCD module 4 and the second LCD module 6. When in use, the polarization beam splitter 2 is used to separate light of different polarization directions in an incident light beam 11 into a first light beam 12 and a second light beam 13, so that the first light beam 12 and the second light beam 13 are respectively incident on the first LCD module 4 and the second LCD module 6, and the first reflector 3 and the second reflector 5 are used to change the optical paths of the first light beam 12 and the second light beam 13, so that the first light beam 12 and the second light beam 13 can converge to the polarization light combiner 7 for merging. In this way, by setting up a polarization splitting and combining system to form a new optical path structure, the light beams with different polarization directions in the light source 1 can be reasonably utilized, effectively improving the utilization rate of the light source 1, so that the brightness of the projection device is improved; and by improving the utilization rate of the light source 1, the heating problem of the projection device can also be improved, the use effect of the projection device is improved and the service life is extended.

[0037] It should be noted that the projection device provided in the present application also includes a lens 8, such as Figure 1 As shown, the lens 8 is arranged on the light-emitting side of the polarized light combiner 7, and the first light beam 12 and the second light beam 13 are combined into an output light beam 14 and then incident on the lens 8, and then projected onto the screen. A beam uniformity and shaping system 9 is also arranged between the light source 1 and the polarized light splitter 2. The beam and shaping system 9 includes but is not limited to aspherical lenses, spherical lenses, reflective covers (light buckets), compound eye lenses, and light guide tubes. The light source and shaping system 9 is used to change the light intensity distribution of the incident light beam 11 emitted by the light source 1.

[0038] In the projection device provided in the present application, the polarization beam splitter 2 includes a cubic beam splitter or a flat beam splitter; and / or the polarization light combining element 7 includes a cubic beam splitter or a flat beam splitter.

[0039] Optionally, in this embodiment, the polarization beam splitter 2 and the polarization beam combiner 7 are both flat beam splitters.

[0040] The plate beam splitter can distinguish and separate light with different polarization directions, and produce different reflection and transmission behaviors according to the polarization direction of the light. Specifically, S light (vertical polarization) can be reflected by the plate beam splitter, and P light (parallel polarization) can penetrate the plate beam splitter.

[0041] The flat beam splitter is small in size and has more flexible position design, making it suitable for projection devices with small size and limited installation space.

[0042] In other embodiments, the polarization light splitting element 2 may also be a polarization beam splitter, and the polarization light combining element 7 may also be a polarization beam combiner, but is not limited thereto.

[0043] The projection device provided in this embodiment is as follows: Figure 1 As shown, the angle between the polarization plane of the polarization beam splitter 2 and the incident light beam 11 is ( Figure 1 The value range of α is 25°-65°.

[0044] According to the different angles between the polarization plane of the polarization beam splitter 2 and the incident light beam 11, the polarization light combiner 7, the first reflector 3, and the second reflector 5 are arranged at different positions and angles.

[0045] With the above design, the position between the polarization beam splitter 2 and the light source 1 is reasonably designed, and the polarization beam splitter 2 can be used normally.

[0046] Optionally, in a specific embodiment, if Figure 1 As shown, the angle between the polarization plane of the polarization beam splitter 2 and the incident light beam 11 is 45°, and the polarization plane of the polarization light combiner 7 , the reflection plane of the first reflector 3 , and the reflection plane of the second reflector 5 are all parallel to the polarization plane of the polarization beam splitter 2 .

[0047] like Figure 1 As described above, the polarization beam splitter 2 and the polarization beam combiner 7 are both flat-plate beam splitters, and the first reflector 3 and the second reflector 5 are both flat-plate reflectors.

[0048] The incident light beam 11 enters the polarization beam splitter 2 with an incident angle of 45°, and part of the incident light beam 11 is reflected to obtain a first light beam 12 with an exit angle of 45°, so that the angle between the first light beam 12 and the incident light beam 11 is 90°; another part of the incident light beam 11 passes through the polarization beam splitter 2 to obtain a second light beam 13, and the second light beam 13 is parallel to the incident light beam 11. The optical paths of the first light beam 12 and the second light beam 13 output by the polarization beam splitter 2 are perpendicular, and the polarization directions are also perpendicular to each other.

[0049] The first light beam 12 is incident on the reflective surface of the first reflector 3 at an incident angle of 45°. The first light beam 12 is reflected by the first reflector 3, and the direction of the light path is changed by 90°. The second light beam 13 is incident on the reflective surface of the second reflector 5 at an incident angle of 45°. The second light beam 13 is reflected by the second reflector 5, and the direction of the light path is changed by 90°. The light paths of the first light beam 12 reflected by the first reflector 3 and the second light beam 13 reflected by the second reflector 5 are perpendicular.

[0050] The first light beam 12 reflected by the first reflector 3 and the second light beam 13 reflected by the second reflector 5 enter the polarized light combiner 7 from different sides, and the incident angles are both 45°. One of the light beams is reflected by the polarized light combiner 7, and the direction of the light path is changed by 90°, while the other light beam penetrates the polarized light combiner 7, and the direction of the light path remains unchanged. The polarized light combiner 7 can combine the first light beam 12 and the second light beam 13 into one light beam and shoot it to the lens 8.

[0051] With the above design, the optical components are arranged reasonably and can provide an efficient optical path.

[0052] It can be understood that, under the premise of achieving light splitting and light combining, the setting positions of the polarization splitter 2, the polarization light combining element 7, the first reflector 3 and the second reflector 5 and the angle between the mirror surface and the incident light beam 11 are adjustable, and can be designed specifically according to actual conditions and are not limited here.

[0053] The projection device provided in this embodiment is as follows: Figure 1 As shown, the first reflector 3 is arranged at the first light-emitting side of the polarization beam splitter 2, and the first reflector 3 is used to receive and reflect the first light beam 12 output by the polarization beam splitter 2. The first LCD module 4 is arranged at the light-emitting side of the first reflector 3, and the first LCD module 4 is used to receive and output the first light beam 12 reflected by the first reflector 3.

[0054] The first light beam 12 first enters the first reflector 3, and after being reflected by the first reflector 3, the first light beam 12 changes its optical path direction and enters the first LCD module 4. The optical path direction of the first light beam 12 before and after entering and exiting the first LCD module 4 remains unchanged, but the image information it carries is different.

[0055] The first reflector 3 and the first LCD module 4 are arranged reasonably, and the first light beam 12 can be transmitted from the polarization beam splitter 2 to the first LCD module 4 and the polarization beam combiner 7 .

[0056] The projection device provided in this embodiment is as follows: Figure 1 As shown, the second reflector 5 is arranged on the second light-emitting side of the polarization splitter 2, and the second reflector 5 is used to receive and reflect the second light beam 13 output by the polarization splitter 2; the second LCD module 6 is arranged on the light-emitting side of the second reflector 5, and the second LCD module 6 is used to receive and output the second light beam 13 reflected by the second reflector 5.

[0057] The second light beam 13 first enters the second reflector 5, and after being reflected by the second reflector 5, the second light beam 13 changes its optical path direction and enters the second LCD module 6. The optical path direction of the second light beam 13 before and after entering and exiting the second LCD module 6 remains unchanged, but the image information it carries is different.

[0058] The second reflector 5 and the second LCD module 6 are arranged reasonably, and the second light beam 13 can be transmitted from the polarization beam splitter 2 to the second LCD module 6 and the polarization beam combiner 7 .

[0059] The projection device provided in this embodiment is as follows: Figure 1 As shown, the first LCD module 4 includes a first polarizer 41 and a first LCD screen 42 which are arranged opposite to each other, and the first polarizer 41 is arranged on the light incident side of the first LCD screen 42. The second LCD module 6 includes a second polarizer 61 and a second LCD screen 62 which are arranged opposite to each other, and the second polarizer 61 is arranged on the light incident side of the second LCD screen 62.

[0060] The first light beam 12 passes through the first polarizer 41 , and its polarization direction changes from S light to P light. Then, the first light beam 12 passes through the first LCD screen 42 and is incident on the polarization light combiner 7 .

[0061] The second light beam 13 passes through the second polarizer 61 , and its polarization direction changes from P light to S light. Then, the second light beam 13 passes through the second LCD screen 62 and is incident on the polarization light combiner 7 .

[0062] The polarized light combiner 7 is a flat beam splitter. The first light beam 12 output by the first LCD module 4 penetrates the polarized light combiner 7 , and the second light beam 13 output by the second LCD module 6 is reflected by the polarized light combiner 7 , thereby being combined with the first light beam 12 to form an output light beam 14 .

[0063] With the above design, the first LCD module 4 and the second LCD module 6 have reasonable structures and high utilization rate of the incident light beam.

[0064] In the projection device provided in this embodiment, the light source 1 is an LED light source.

[0065] LED light sources have the advantages of low energy consumption, long life, high brightness and fast startup, and are small in size, making them suitable for projection devices with small size and limited installation space.

[0066] In other embodiments, the light source 1 may also be a mercury lamp or a laser light source, or a mixed light source of LED and laser. The specific design may be made according to actual conditions and is not limited here.

[0067] Embodiment 2:

[0068] The difference between this embodiment and the first embodiment lies in the disposition of the first reflector 3 and the first LCD module 4 , and the second reflector 5 and the second LCD module 6 .

[0069] The projection device provided in this embodiment is as follows: Figure 2As shown, the first LCD module 4 is arranged at the first light-emitting side of the polarization beam splitter 2, and the first LCD module 4 is used to receive and output the first light beam 12 output by the polarization beam splitter 2. The first reflector 3 is arranged at the light-emitting side of the first LCD module 4, and the first reflector 3 is used to receive and reflect the first light beam 12 output by the first LCD module 4.

[0070] The first light beam 12 penetrates the first LCD module 4 and is incident on the first reflector 3 . After being reflected by the first reflector 3 , the first light beam 12 changes its optical path direction and is incident on the polarization light combiner 7 .

[0071] The above embodiment provides an alternative optical path design solution. The first reflector 3 and the first LCD module 4 are arranged reasonably, and the first light beam 12 can be transmitted from the polarization beam splitter 2 to the first LCD module 4 and the polarization beam combiner 7 .

[0072] In the projection device provided in this embodiment, the second LCD module 6 is arranged on the first light-emitting side of the polarization beam splitter 2, and the second LCD module 6 is used to receive and output the second light beam 13 output by the polarization beam splitter 2. The second reflector 5 is arranged on the light-emitting side of the second LCD module 6, and the second reflector 5 is used to receive and reflect the second light beam 13 output by the second LCD module 6.

[0073] The second light beam 13 penetrates the second LCD module 6 and is incident on the second reflector 5 . After being reflected by the second reflector 5 , the second light beam 13 changes its optical path direction and is incident on the polarization light combiner 7 .

[0074] The above embodiment provides an alternative optical path design solution. The second reflector 5 and the second LCD module 6 are arranged reasonably, and the second light beam 13 can be transmitted from the polarization beam splitter 2 to the second LCD module 6 and the polarization beam combiner 7 .

[0075] It can be understood that in order to provide more design solutions and meet the design requirements of more projection devices, the solutions provided in the first embodiment and the second embodiment can be used in combination. Optionally, in one embodiment, the first reflector 3 is arranged on the first light-emitting side of the polarization beam splitter 2, and the first reflector 3 is used to receive and reflect the first light beam 12 reflected by the polarization beam splitter 2; the second reflector 5 is arranged on the light-emitting side of the second LCD module 6, and the second reflector 5 is used to receive and reflect the second light beam 13 output by the second LCD module 6.

[0076] Embodiment three:

[0077] The difference between this embodiment and the first embodiment lies in the disposition of the first LCD module 4 and the second LCD module 6 .

[0078] The projection device provided in this embodiment is as follows: Figure 3As shown, the first LCD module 4 includes a first polarizer 41, a first phase difference plate 43 and a first LCD screen 42. The first polarizer 41 and the first LCD screen 42 are arranged opposite to the first phase difference plate 43. The first polarizer 41 is arranged on the light incident side of the first phase difference plate 43, and the first LCD screen 42 is arranged on the light exit side of the first phase difference plate 43. The second LCD module 6 includes a second polarizer 61, a second phase difference plate 63 and a second LCD screen 62. The second polarizer 61 and the second LCD screen 62 are arranged opposite to the second phase difference plate 63. The second polarizer 61 is arranged on the light incident side of the second phase difference plate 63, and the second LCD screen 62 is arranged on the light exit side of the second phase difference plate 63.

[0079] The first light beam 12 passes through the first polarizer 41, and the polarization direction changes from S light to P light. Then the first light beam 12 passes through the first phase difference plate 43, and the polarization direction changes again from P light to S light.

[0080] The second light beam 13 passes through the second polarizer 61, and the polarization direction changes from P light to S light. Then the second light beam 13 passes through the second phase difference plate 63, and the polarization direction changes again from S light to P light.

[0081] The polarized light combiner 7 is a flat beam splitter. The first light beam 12 output by the first LCD module 4 is reflected by the polarized light combiner 7 , and the second light beam 13 output by the second LCD module 6 can penetrate the polarized light combiner 7 , thereby being combined with the first light beam 12 to form an output light beam 14 .

[0082] The above embodiment provides an alternative optical path design solution. The first LCD module 4 and the second LCD module 6 have reasonable structures and high utilization rate of the incident light beam.

[0083] It should be noted that in the first embodiment and the third embodiment, under the premise that the light source 1 and the optical lens are set at the same position and angle, the light path direction of the output light beam 14 output by the second polarized light combiner 7 is different, and the position of the lens 8 in the corresponding projection device is also different. The position of the lens 8 can be adjusted according to actual conditions.

[0084] In summary, the projection device provided in the present application can form a new type of polarization light splitting and light combining system by setting a first polarization light splitting element 2, a second polarization light combining element 7, a first reflector 3 and a second reflector 5. The optical path system improves the utilization rate of the light source 1. Compared with the traditional single-chip LCD projection device, the low brightness effect at the same power is improved by more than 1.5 times, and by improving the utilization rate of the light source 1, the heating problem of the projection device can also be improved, the use effect of the projection device is improved and the service life is extended.

[0085] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A projection device, characterized in that: include: a light source, for emitting an incident light beam; a polarization beam splitter, disposed on a light-emitting side of the light source, for receiving the incident light beam and for splitting the incident light beam into a first light beam and a second light beam having different polarization directions and different emission directions; a first reflector and a first LCD module, wherein the first reflector and the first LCD module are arranged at a first light-emitting side of the polarization beam splitter, the first reflector is used to receive and reflect the first light beam to adjust the light path of the first light beam, and the first LCD module is used to receive and output the first light beam; a second reflector and a second LCD module, wherein the second reflector and the second LCD module are arranged at a second light-emitting side of the polarization beam splitter, the second reflector is used to receive and reflect the second light beam to adjust the light path of the second light beam, and the second LCD module is used to receive and output the second light beam; The polarized light combiner is arranged on the light output side of the first LCD module and the second LCD module, and is used to combine the first light beam and the second light beam into an output light beam and output the output light beam.

2. The projection device according to claim 1, characterized in that: The polarization beam splitter comprises a cubic beam splitter or a flat beam splitter; and / or the polarization beam combiner comprises a cubic beam splitter or a flat beam splitter.

3. The projection device according to claim 2, characterized in that: The angle between the polarization plane of the polarization beam splitter and the incident light beam ranges from 25° to 65°.

4. The projection device according to claim 3, characterized in that: The angle between the polarization plane of the polarization beam splitter and the incident light beam is 45°, and the polarization plane of the polarization light combiner, the reflection plane of the first reflector, and the reflection plane of the second reflector are all parallel to the polarization plane of the polarization beam splitter.

5. The projection device according to any one of claims 2 to 4, characterized in that: The first reflector is arranged on the first light-emitting side of the polarization beam splitter, and the first reflector is used to receive and reflect the first light beam output by the polarization beam splitter; the first LCD module is arranged on the light-emitting side of the first reflector, and the first LCD module is used to receive and output the first light beam reflected by the first reflector.

6. The projection device according to any one of claims 2 to 4, characterized in that: The first LCD module is arranged on the first light output side of the polarization beam splitter, and the first LCD module is used to receive and output the first light beam output by the polarization beam splitter; the first reflector is arranged on the light output side of the first LCD module, and the first reflector is used to receive and reflect the first light beam output by the first LCD module.

7. The projection device according to any one of claims 2 to 4, characterized in that: The second reflector is arranged on the second light-emitting side of the polarization beam splitter, and the second reflector is used to receive and reflect the second light beam output by the polarization beam splitter; the second LCD module is arranged on the light-emitting side of the second reflector, and the second LCD module is used to receive and output the second light beam reflected by the second reflector.

8. The projection device according to any one of claims 2 to 4, characterized in that: The second LCD module is arranged on the second light-emitting side of the polarization beam splitter, and the second LCD module is used to receive and output the second light beam output by the polarization beam splitter; the second reflector is arranged on the light-emitting side of the second LCD module, and the second reflector is used to receive and reflect the second light beam output by the second LCD module.

9. The projection device according to any one of claims 2 to 4, characterized in that: The first LCD module includes a first polarizer and a first LCD screen that are arranged opposite to each other, and the first polarizer is arranged on the light incident side of the first LCD screen; the second LCD module includes a second polarizer and a second LCD screen that are arranged opposite to each other, and the second polarizer is arranged on the light incident side of the second LCD screen.

10. The projection device according to any one of claims 2 to 4, characterized in that: The first LCD module includes a first polarizer, a first phase difference plate and a first LCD screen, the first polarizer and the first LCD screen are both arranged opposite to the first phase difference plate, the first polarizer is arranged on the light incident side of the first phase difference plate, and the first LCD screen is arranged on the light exit side of the first phase difference plate; the second LCD module includes a second polarizer, a second phase difference plate and a second LCD screen, the second polarizer and the second LCD screen are both arranged opposite to the second phase difference plate, the second polarizer is arranged on the light incident side of the second phase difference plate, and the second LCD screen is arranged on the light exit side of the second phase difference plate.

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