Projection device and head-up display equipment

Abstract

The utility model relates to the technical field of optical equipment, and discloses a projection device and head-up display equipment. The projection device comprises a display module, a projection lens module and a light path module. The display module comprises a light splitting module, a first display module and a second display module; the projection lens module is arranged on the light emitting surface of the light splitting module; the light path module comprises a P polarized light path and an S polarized light path which are arranged on one side of a light incident surface of the light splitting module; P polarized light transmitted by the P polarized light path and S polarized light transmitted by the S polarized light path are irradiated to the first display module and the second display module through the light splitting module respectively; the polarized light reflected by the first display module and the second display module is collected through the light splitting module and is emitted from the light emitting surface of the light splitting module. According to the projection device provided by the invention, light energy recovery is realized, and brightening of the whole projection area or a local projection area can be realized.

Description

Technical Field

[0001] This application belongs to the field of optical equipment technology, and specifically relates to a projection device and a head-up display device. Background Technology

[0002] Projection devices can project images onto a designated area for display. However, in situations with strong ambient light, the projected display area may become difficult for users to see. To solve the problem of unclear projection due to strong light, the usual approach is to directly increase the overall brightness by adding more light sources. However, it is not possible to locally enhance the brightness of a specific area. For example, in the head-up display area of ​​a vehicle, the display area is divided into several functional sections, and current optical systems cannot highlight any particular functional area. Utility Model Content

[0003] The purpose of this application is to provide a projection device and a head-up display device to solve the problem that existing projection devices cannot achieve local brightness enhancement of a specified area.

[0004] To achieve the above objectives, the first aspect of this application provides a projection device, comprising:

[0005] The display module includes a beam splitting module, a first display module, and a second display module;

[0006] A projection lens module is arranged on the light-emitting surface of the beam-splitting module; and

[0007] The optical path module includes a P-polarized light path and an S-polarized light path arranged on one side of the light incident surface of the beam splitter. The P-polarized light propagating in the P-polarized light path and the S-polarized light propagating in the S-polarized light path are both irradiated onto the first display module and the second display module respectively by the beam splitter.

[0008] The polarized light reflected by the first display module and the second display module is collected by the beam splitter and emitted from the light-emitting surface of the beam splitter.

[0009] As a further improvement to the above technical solution:

[0010] In some embodiments, the P-polarized light path includes a first lens module and a first adjustment module, wherein the first adjustment module drives at least one first lens body connected to the first lens module, and the first adjustment module has X-axis translational degree of freedom, Y-axis translational degree of freedom and Z-axis translational degree of freedom;

[0011] And / or, the S-polarized light path includes a second lens module and a second adjustment module, the second adjustment module driving and connecting at least one second lens body in the second lens module, and the second adjustment module having X-axis translational degree of freedom, Y-axis translational degree of freedom and Z-axis translational degree of freedom.

[0012] In some embodiments, the optical path module further includes a first light source module and a first polarization separation module;

[0013] The first polarization separation module is located at the light-emitting end of the first light source module and the light-inlet end of the P-polarized light path.

[0014] In some embodiments, the P-polarized light path further includes a first homogenizing and shaping module and a first lens module arranged sequentially along the P-polarized light propagation direction, wherein the first homogenizing and shaping module is located between the first lens module and the first polarization separation module.

[0015] The S-polarized light path includes a first reflecting mirror, a second light-shaping module, and a second lens module arranged sequentially along the S-polarized light propagation direction. The first reflecting mirror is located at the light-inlet end of the S-polarized light path.

[0016] In some embodiments, the optical path module further includes a first light source module and a second light source module;

[0017] The first light source module corresponds to the light input end of the P-polarized light path;

[0018] The second light source module corresponds to the light input end of the S-polarized light path.

[0019] In some embodiments, the P-polarized light optical path further includes a first homogenizing and shaping module, a P-polarized light conversion module, and a first lens module arranged sequentially along the propagation direction of the P-polarized light, wherein the first homogenizing and shaping module is located at the light-inlet end of the P-polarized light optical path.

[0020] The S-polarized light optical path includes a second light-shaping module, an S-polarized light conversion module, and a second lens module arranged sequentially along the propagation direction of the S-polarized light. The second light-shaping module is located at the light-inlet end of the S-polarized light optical path.

[0021] In some embodiments, both the first display module and the second display module are LCOS display modules, and the beam splitting module is a first PBS prism. The first PBS prism has a first bonding surface coated with a polarizing beam splitting film, and the angle between the first bonding surface and the incident surface of the first PBS prism is 45°.

[0022] P-polarized light can penetrate the first bonding surface, while S-polarized light can be reflected by the first bonding surface.

[0023] In some embodiments, the P-polarized light path further includes a second polarization separation module, which is arranged at the light-emitting end of the P-polarized light path, with the light-emitting surface of the second polarization separation module facing the beam splitter.

[0024] The S-polarized light path further includes a second reflector, which is arranged at the light-emitting end of the S-polarized light path, with the reflecting surface of the second reflector facing the light-emitting surface of the second polarization separation module.

[0025] The light-emitting surface of the second polarization separation module can reflect S-polarized light.

[0026] In some embodiments, the first display module (120) and the second display module (130) are both configured as display modules based on the same reflection principle;

[0027] And / or, both the first display module and the second display module are DLP display modules, and the beam splitting module is a second PBS prism. The second PBS prism has two coplanar incident light surfaces and a second bonding surface that is not coated with a polarizing beam splitting film. The angle between the second bonding surface and the two incident light surfaces of the second PBS prism is 90°.

[0028] P-polarized light can penetrate the second bonding surface, while S-polarized light can be reflected by the second bonding surface.

[0029] A second aspect of this application provides a head-up display device, including a projection device according to the first aspect described above.

[0030] Through the above technical solution, the projection device provided in this application allows both P-polarized light propagating through the P-polarized light path and S-polarized light propagating through the S-polarized light path to be respectively irradiated onto the first display module and the second display module via a beam splitting module. Simultaneously, the P-polarized light and S-polarized light are reflected by the first and second display modules into the beam splitting module, which then collects the reflected polarized light and emits it from its light-emitting surface. This light is then projected through the projection lens module to form a projection area. Thus, when the position and size of the irradiated area (spot) formed by the polarized light on the corresponding first and second display modules are consistent, the entire projection area formed by the projection lens module is a superposition of P-polarized light and S-polarized light, achieving overall brightness enhancement. When the position and size of the polarized light illuminating the corresponding areas (spots) on the first and second display modules are inconsistent, a large projection area is formed by the projection lens module, and a small projection area is formed within the large projection area. This small projection area is a superposition of P-polarized and S-polarized light, so the brightness of the small projection area is higher than the brightness of other positions in the large projection area, thus creating local brightness enhancement. Furthermore, simply changing the position of the small projection area can achieve brighter projection of a specified block. When applied to head-up display devices, a specific functional area can be highlighted according to requirements, greatly improving the user experience.

[0031] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0033] Figure 1 This is a schematic diagram of the optical path structure of the first projection device provided in the embodiments of this application;

[0034] Figure 2 for Figure 1 A partial structural diagram of the P-polarized light path and S-polarized light path in the projection device shown.

[0035] Figure 3 This is a schematic diagram of the optical path structure of the second projection device provided in the embodiments of this application;

[0036] Figure 4 A schematic diagram illustrating the conversion principle of a P-polarization conversion module (a) and an S-polarization conversion module (b) provided in this application embodiment;

[0037] Figure 5 This is a schematic diagram of the optical path structure of the third projection device provided in the embodiments of this application;

[0038] Figure 6 This is a schematic diagram of the optical path structure of the fourth projection device provided in the embodiments of this application;

[0039] Figure 7 This is a schematic diagram of the optical path structure of the fifth projection device provided in the embodiments of this application;

[0040] Figure 8 This is a schematic diagram of the optical path structure of the sixth projection device provided in the embodiments of this application;

[0041] Figure 9 A schematic diagram illustrating the principle of total internal reflection of S-polarized light reflected from the incident surface of a second PBS prism provided in this application embodiment;

[0042] Figure 10 A schematic diagram of the optical path structure of the seventh projection device provided in the embodiments of this application.

[0043] Explanation of reference numerals in the attached figures

[0044] 100. Display module; 110. Spectrometer module; 111. First PBS prism; 112. Second PBS prism; 120. First display module; 130. Second display module;

[0045] 200. Projection lens module;

[0046] 300. Optical path module; 310. P-polarized light optical path; 311. First lens module; 312. First adjustment module; 313. First homogenizing and shaping module; 314. First polarization separation module; 315. Second polarization separation module; 316. P-polarization conversion module; 320. S-polarized light optical path; 321. Second lens module; 322. Second adjustment module; 323. First reflector; 324. Second homogenizing and shaping module; 325. Second reflector; 326. S-polarization conversion module; 330. First light source module; 340. Second light source module. Detailed Implementation

[0047] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0048] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0049] Example 1

[0050] Please see Figure 1 This embodiment provides a projection device, which can be applied in areas including but not limited to head-up displays in office equipment or vehicles.

[0051] In this embodiment, the projection device includes a display module 100, a projection lens module 200, and an optical path module 300. The display module 100 includes a beam splitting module 110, a first display module 120, and a second display module 130. The first display module 120 and the second display module 130 are of the same type, i.e., they use the same reflection principle.

[0052] In some embodiments, such as Figure 1 As shown, for example, the first display module 120 and the second display module 130 are both LCOS display modules. The LCOS display module has the function of converting P-polarized light into S-polarized light for reflection and converting S-polarized light into P-polarized light for reflection.

[0053] In other embodiments, such as Figure 7 As shown, both the first display module 120 and the second display module 130 are DLP display modules. DLP display modules do not convert P-polarized light to S-polarized light when reflecting light.

[0054] Please see Figure 1 The projection lens module 200 is arranged on the light-emitting surface of the beam splitter module 110, and can project the display content of the first display module 120 and the second display module 130.

[0055] The optical path module 300 includes a P-polarized light path 310 and an S-polarized light path 320 arranged on one side of the light-incident surface of the beam splitting module 110. The P-polarized light propagating in the P-polarized light path 310 is irradiated onto the first display module 120 by the beam splitting module 110 and forms a P-light irradiation area (which can also be understood as a light spot). The S-polarized light propagating in the S-polarized light path 320 is irradiated onto the second display module 130 by the beam splitting module 110 and forms an S-light irradiation area (which can also be understood as a light spot).

[0056] In this process, P-polarized light and S-polarized light are reflected by the corresponding first display module 120 and second display module 130. The polarized light reflected by the first display module 120 and the second display module 130 is collected by the beam splitter 110 and emitted from the light-emitting surface of the beam splitter 110. The polarized light (including P-polarized light and S-polarized light) emitted from the light-emitting surface of the beam splitter 110 is projected into an image by the projection lens module 200.

[0057] Specifically, the projection device provided in this embodiment can use P-polarized light propagating through P-polarized light path 310 to illuminate the first display module 120 through beam splitting module 110 and form a P-light illumination area. S-polarized light propagating through S-polarized light path 320 can also be illuminated by beam splitting module 110 to illuminate the second display module 130 and form an S-light illumination area. At the same time, the P-light illumination area on the first display module 120 will be reflected, and the S-light illumination area on the second display module 130 will also be reflected into beam splitting module 110. The beam splitting module 110 then collects the polarized light reflected from the P-light illumination area and the S-light illumination area and emits it from the light-emitting surface of beam splitting module 110. The light is then projected by projection lens module 200 to form a projection area.

[0058] Thus, when it is necessary to enhance the overall brightness of the projection area, if the position and area size of the polarized light illuminating the corresponding first display module 120 and second display module 130 are set to be the same, then the entire projection area formed by the projection lens module 200 is the superposition of P-polarized light and S-polarized light, thereby enhancing the overall brightness of the projection area.

[0059] When it is necessary to enhance the local brightness of the projection area, the relative position and size of the illumination areas (P-light illumination area and S-light illumination area, which can also be understood as light spots) formed by polarized light illuminating the corresponding first and second display modules are adjusted. If the areas are inconsistent (positions overlap), the projection through the projection lens module 200 will form a large projection area and a small projection area within the large projection area. This small projection area is the superposition of P-polarized light and S-polarized light, so the brightness of the small projection area is higher than the brightness of other positions in the large projection area, thereby achieving local brightness enhancement.

[0060] Understandably, simply changing the position of the small projection area (achieved by adjusting the layout of optical elements in the internal structure of the P-polarized light path 310 or the S-polarized light path 320) can result in enhanced projection of a specified area. When applied to head-up display devices, this allows for the highlighting of specific functional zones as needed, significantly improving the user experience.

[0061] In some embodiments, the polarized light can be controlled to illuminate different positions (non-overlapping) on ​​the corresponding first display module 120 and second display module 130, thereby forming two independent projection areas.

[0062] Example 2

[0063] Please see Figure 1 and Figure 2 This embodiment provides a projection device. This embodiment is an improvement upon the technology of Embodiment 1 described above. The difference between Embodiment 1 and Embodiment 1 lies in:

[0064] In this embodiment, both the first display module 120 and the second display module 130 are LCOS display modules. The LCOS display module has the function of converting P-polarized light into S-polarized light for reflection and converting S-polarized light into P-polarized light for reflection.

[0065] The beam splitting module 110 is a first PBS prism 111, which has a first bonding surface coated with a polarizing beam splitting film. The angle between the first bonding surface and the incident surface of the first PBS prism 111 is 45°, and the polarized light reflected from the P-light irradiation area and the S-light irradiation area directly enters the first bonding surface.

[0066] It is understandable that P-polarized light can pass directly through the first bonding surface coated with a polarizing beam splitter, while S-polarized light will be reflected by the first bonding surface coated with a polarizing beam splitter.

[0067] In this embodiment, the first PBS prism 111 is a PBS prism with a quadrangular prism structure, which is formed by joining the corresponding sides of the hypotenuses of two triangular prisms. The joining method of the corresponding sides of the hypotenuses of the two triangular prisms may include, but is not limited to, adhesive bonding, molecular force bonding, etc. The right surface of the first PBS prism 111 is defined as the light-incident surface, and the upper surface of the first PBS prism 111 is defined as the light-excising surface. The first display module 120 is arranged on the left side of the first PBS prism 111 to receive P-polarized light transmitted through the first bonding surface, and the second display module 130 is arranged below the first PBS prism 111 to receive S-polarized light reflected by the first bonding surface. Thus, the S-polarized light (converted from P-polarized light) reflected by the first display module 120 enters the first PBS prism 111, is reflected by the first bonding surface, and exits from the upper surface of the first PBS prism 111 into the projection lens module 200; the P-polarized light (converted from S-polarized light) reflected by the second display module 130 enters the first PBS prism 111, passes through the first bonding surface, and exits directly from the upper surface of the first PBS prism 111 into the projection lens module 200.

[0068] The optical path module 300 also includes a first light source module 330. It should be noted that in this embodiment, a first light source module 330 is used to provide the light source for projection, i.e., a single light source structure.

[0069] The first light source module 330 and the light input end of the P-polarized light path 310 are provided with a first polarization light separation module 314. The first polarization light separation module 314 can realize polarization light separation. The first polarization light separation module 314 is used to split the incident light emitted by the first light source module 330 into P-polarized light entering the P-polarized light path 310 and S-polarized light entering the S-polarized light path 320.

[0070] In this embodiment, specifically, the first polarization separation module 314 includes an inclined first polarization separation plate. The first polarization separation plate allows P-polarized light to pass directly through and then enter the P-polarized light optical path 310. S-polarized light is directly reflected after irradiating the polarization separation plate and then enters the S-polarized light optical path 320. In this way, the separated S-polarized light can be reused, thereby achieving the purpose of energy recovery.

[0071] Furthermore, the P-polarized light path 310 also includes a first homogenizing and shaping module 313 and a first lens module 311 arranged sequentially along the propagation direction of the P-polarized light. The first homogenizing and shaping module 313 is located between the first lens module 311 and the first polarization separation module 314. In this way, after the P-polarized light is homogenized and shaped by the first homogenizing and shaping module 313, it enters the first lens module 311 for focusing. The focused P-polarized light then enters the beam splitting module 110, thus ensuring uniform brightness within the P-light illumination area.

[0072] The S-polarized light path 320 includes a first reflector 323, a second light-shaping module 324, and a second lens module 321 arranged sequentially along the S-polarized light propagation direction. The first reflector 323 is located at the light-inlet end of the S-polarized light path 320.

[0073] Specifically, the reflective surface of the first reflector 323 is parallel to the first polarization separation plate. Thus, the S-polarized light reflected from the first polarization separation plate is reflected back to the reflective surface of the first reflector 323, and then reflected again by the reflective surface of the first reflector 323 into the second homogenizing and shaping module 324 for homogenization and shaping before entering the second lens module 321 for focusing. The focused S-polarized light then enters the beam splitting module 110. This ensures uniform brightness within the S-light illumination area.

[0074] In this embodiment, the first homogenizing and shaping module 313 and the second homogenizing and shaping module 324 have the same structure. Specifically, both the first homogenizing and shaping module 313 and the second homogenizing and shaping module 324 include a compound eye lens. The compound eye lens is based on the imaging optics principle. It divides the beam of propagating polarized light (P-polarized light or S-polarized light) into multiple fine beams and uses the superposition of these fine beams to compensate for non-uniformity, thereby obtaining uniform light over a large area.

[0075] The first lens module 311 and the second lens module 321 described above each have at least one lens body, such as one, two, three, or other quantities. The number of lens bodies in the first lens module 311 and the second lens module 321 can be the same or different. It is understood that the number of lens bodies can be set according to the projection requirements, and is not specifically limited in this embodiment.

[0076] Furthermore, the P-polarized light path 310 also includes a second polarization light separation module 315, which is arranged at the light output end of the P-polarized light path 310, with the light output surface of the second polarization light separation module 315 facing the beam splitting module 110.

[0077] The S-polarized light path 320 also includes a second reflector 325, which is positioned at the light-emitting end of the S-polarized light path 320, with its reflecting surface facing the light-emitting surface of the second polarization separation module 315. Thus, S-polarized light propagating from the S-polarized light path 320 is reflected by the second reflector 325 to the light-emitting surface of the second polarization separation module 315. The second polarization separation module 315 separates P-polarized light from S-polarized light, and its light-emitting surface further reflects the S-polarized light, allowing it to directly enter the beam splitter module 110. P-polarized light propagating from the P-polarized light path 310 can directly pass through the second polarization separation module 315 and enter the beam splitter module 110.

[0078] It is also understood that the second reflector 325 and the second polarization separation module 315 can converge the P-polarized light and S-polarized light propagating in the P-polarized light path 310 and the S-polarized light path 320, so that the P-polarized light and S-polarized light enter the beam splitting module 110 together.

[0079] Optionally, the second polarization separation module 315 includes an inclined second polarization separation plate, which is parallel to the second reflector 325 and arranged opposite to the first polarization separation plate. The function of the second polarization separation plate is the same as that of the first polarization separation plate described above, and will not be repeated here.

[0080] The projection device provided in this embodiment is based on an LCOS display module. It uses a first polarization separation module 314 to split the same light source (provided by the first light source module 330) into P-polarized light and S-polarized light. The P-polarized light and S-polarized light then form corresponding P-polarized light paths 310 and S-polarized light paths 320, respectively, thereby achieving the purpose of light energy recovery and full utilization. Furthermore, through the structural layout design of the internal lens modules of the P-polarized light path 310 or S-polarized light path 320, the area of ​​polarized light incident on the first display module 120 and the second display module 130 can be adjusted. If the areas are the same, the brightness of the entire projection area can be enhanced; if the areas are different, the brightness of a localized projection area can be enhanced. Thus, the projection device provided in this embodiment can be configured according to different application scenarios.

[0081] Example 3

[0082] Please see Figure 2 , Figure 3 and Figure 4 This embodiment provides a projection device. This embodiment is an improvement upon the technology of Embodiment Two described above. The difference between Embodiment Two and Embodiment Two lies in:

[0083] In this embodiment, the optical path module 300 adopts a dual-light source structure. Specifically, the optical path module 300 further includes a first light source module 330 and a second light source module 340. The first light source module 330 corresponds to the light input end of the P-polarized light path 310; the second light source module 340 corresponds to the light input end of the S-polarized light path 320. That is to say, the first light source module 330 provides a light source for the P-polarized light path 310, and the second light source module 340 provides a light source for the S-polarized light path 320.

[0084] The P-polarized light path 310 further includes a first homogenizing and shaping module 313, a P-polarized light conversion module 316, and a first lens module 311 arranged sequentially along the propagation direction of P-polarized light. The first homogenizing and shaping module 313 is located at the light-inlet end of the P-polarized light path 310. The structures of the first homogenizing and shaping module 313 and the first lens module 311 are consistent with those in Embodiment 2 above, and will not be described again here. The P-polarized light conversion module 316 allows P-polarized light to pass through and is used to convert S-polarized light into P-polarized light.

[0085] The S-polarized light optical path 320 further includes a second homogenizing and shaping module 324, an S-polarized light conversion module 326, and a second lens module 321 arranged sequentially along the propagation direction of the S-polarized light. The second homogenizing and shaping module 324 is located at the light-inlet end of the S-polarized light optical path 320. The structures of the second homogenizing and shaping module 324 and the second lens module 321 are consistent with those in Embodiment 2 above, and will not be described again here. The S-polarized light conversion module 326 allows S-polarized light to pass through and is used to convert P-polarized light into S-polarized light.

[0086] Please see Figure 2 and Figure 3 Compared to the P-polarized light path 310 and S-polarized light path 320 in Embodiment 2 above, this embodiment reduces the first polarization separation module 314 and the first reflector 323, while adding the P-polarization conversion module 316 and the S-polarization conversion module 326.

[0087] Please refer to the following: Figure 4 In this embodiment, both the P-polarization conversion module 316 and the S-polarization conversion module 326 are polarization converters (PCS).

[0088] Specifically, such as Figure 4As shown, in the P-polarized light conversion module 316, half-wavelength plates are attached at intervals on the side of the polarization converter facing away from the first uniform light shaping module 313. P-polarized light enters the polarization converter and passes directly through the gap between two adjacent half-wavelength plates (without passing through the half-wavelength plates). S-polarized light enters the polarization converter, is reflected, and then illuminates the half-wavelength plates before being converted into P-polarized light and emitted.

[0089] like Figure 4 As shown, in the S-polarization conversion module 326, half-wavelength plates are attached at intervals on the side of the polarization converter facing away from the first uniform light shaping module 313. P-polarized light enters the polarization converter and directly illuminates the half-wavelength plates, where it is converted into S-polarized light and emitted. The P-polarized light, after entering the polarization converter, is reflected and passes through the gap between two adjacent half-wavelength plates (without passing through the half-wavelength plates).

[0090] This embodiment is an improvement on the technology of Embodiment 2 described above. Therefore, the projection device provided in this embodiment has the same technical effect as that in Embodiment 2. Furthermore, the projection device provided in this embodiment uses a dual-source light source, where both the S-polarized and P-polarized light in each source are converted and fully utilized, resulting in a brighter projection area compared to the single-source solution in Embodiment 2.

[0091] Example 4

[0092] This embodiment provides a projection device. This embodiment is an improvement upon the technology of Embodiment 2 or Embodiment 3 described above. The difference between this embodiment and Embodiment 2 or Embodiment 3 lies in:

[0093] Please see Figure 5 The projection device provided in this embodiment can adjust the size and position of the S-polarized light irradiation area on the second display module 130.

[0094] Specifically, the S-polarized light path 320 also includes a second adjustment module 322, which drives at least one second lens body connected to the second lens module 321. The second adjustment module 322 has X-axis translational degree of freedom, Y-axis translational degree of freedom and Z-axis translational degree of freedom.

[0095] Thus, the first adjustment module 312 can drive the corresponding second lens to move along the X, Y, and Z axes, thereby adjusting the size and position of the S-light illumination area on the second display module 130. Specifically, the second adjustment module 322 drives the second lens to move along the Z-axis to adjust the size of the S-light illumination area on the second display module 130, and the second adjustment module 322 drives the second lens to move along the X-axis or Y-axis to adjust the position of the S-light illumination area on the second display module 130 on the X-axis or Y-axis.

[0096] In this embodiment, the second lens module 321 schematically shows three second lens bodies, of which two second lens bodies are arranged at intervals along the Z-axis, and the third second lens body is disposed between the second reflector 325 and the second polarization separation module 315. The second adjustment module 322 can drive two adjacent second lens bodies (two second lens bodies arranged at intervals along the Z-axis) to move at least one of the two adjacent second light-transmitting lenses along the X, Y, and Z axes for adjustment. This ensures that the adjustment of the S-light illumination area can achieve a better adjustment effect.

[0097] Please see Figure 6 In some embodiments, the projection device can also adjust the size and position of the P-polarized light irradiation area on the first display module 120.

[0098] Specifically, the propagation path direction of P-polarized light in the P-polarized light path 310 is defined as the Z-axis direction. The P-polarized light path 310 also includes a first adjustment module 312, which drives at least one first lens body connected to the first lens module 311. The first adjustment module 312 has X-axis translational degree of freedom, Y-axis translational degree of freedom and Z-axis translational degree of freedom.

[0099] Thus, the first adjustment module 312 can drive the corresponding first lens to move along the X, Y, and Z axes, thereby adjusting the size and position of the P-light illumination area on the first display module 120. Specifically, the first adjustment module 312 drives the first lens to move along the Z-axis to adjust the size of the P-light illumination area on the first display module 120, and the first adjustment module 312 drives the first lens to move along the X-axis or Y-axis to adjust the position of the P-light illumination area on the first display module 120 on the X-axis or Y-axis.

[0100] In some embodiments, the first lens module 311 may arrange three first lens bodies, and the first adjustment module 312 may drive two adjacent first lens bodies to move at least one of the two adjacent first light-transmitting lenses along the X, Y, and Z axes for adjustment. This ensures that the adjustment of the P-light irradiation area achieves a better adjustment effect.

[0101] In some embodiments, the projection device can simultaneously adjust the size and position of the P-polarized light illumination area on the first display module 120 and the S-polarized light illumination area on the second display module 130. The specific adjustment method is achieved by combining the adjustment methods for the S-polarized light illumination area and the P-polarized light illumination area.

[0102] Optionally, the first adjustment module 312 and the second adjustment module 322 described above can be selected as a three-axis adjustment platform with XYZ axis movement adjustment. Of course, other adjustment structures can also be used. This embodiment is only an example and is not intended to limit the scope of protection of this application.

[0103] The projection device provided in this embodiment is an improvement on the technology of Embodiment 2 or Embodiment 3 described above. Therefore, the projection device provided in this embodiment also possesses the technical effects of Embodiment 2 or Embodiment 3. Furthermore, the projection device provided in this embodiment, by adjusting the first lens and / or the second lens, achieves adjustment of the area size (Z-axis movement) and the XY-axis position (X-axis movement or Y-axis movement) of the P-polarized light irradiation area and / or S-polarized light irradiation area, thereby achieving adjustment of the overall brightness and local brightness of the projection area. Thus, the projection device provided in this embodiment has better adjustability, more flexible operation, and greater practicality.

[0104] Example 5

[0105] Please see Figure 7 This embodiment provides a projection device. This embodiment is an improvement upon the technology of Embodiment 1 described above. The difference between Embodiment 1 and Embodiment 1 lies in:

[0106] In this embodiment, both the first display module 120 and the second display module 130 are DLP display modules, wherein when P-polarized light or S-polarized light irradiates the DLP display module, the reflected polarized light is not converted.

[0107] The beam splitter module 110 is a second PBS prism 112, which has two coplanar incident surfaces and a second bonding surface without a polarizing beam splitter film. The two coplanar incident surfaces correspond to the P-polarized light path 310 and the S-polarized light path 320, respectively. The angle between the second bonding surface and the two incident surfaces of the second PBS prism 112 is 90°. The incident surfaces of the second PBS prism 112 can totally reflect the polarized light reflected from the corresponding P-light irradiation area and S-light irradiation area to the second bonding surface. Among them, the P-polarized light can directly penetrate the second bonding surface and exit from the light-exiting surface of the second PBS prism 112, while the S-polarized light is reflected from the second bonding surface and exits from the light-exiting surface of the second PBS prism 112.

[0108] Please refer to the following: Figure 9In this embodiment, the second PBS prism 112 is formed by gluing or molecular force bonding the sides corresponding to the right angles of two triangular prisms, forming a PBS prism with a large triangular prism structure. The surface corresponding to the hypotenuse of the second PBS prism 112 has two light-incident surfaces, and the surface corresponding to one right angle is the light-outcrystal surface. The first display module 120 is arranged on one side of the surface of the second PBS prism 112 adjacent to the light-outcrystal surface, corresponding to one of the light-incident surfaces of the second PBS prism 112, thereby receiving P-polarized light transmitted through the second PBS prism 112. The second display module 130 is arranged on one side of the surface corresponding to the light-outcrystal surface of the second PBS prism 112, corresponding to the other light-incident surface of the second PBS prism 112, thereby receiving S-polarized light transmitted through the second PBS prism 112. Thus, the P-polarized light reflected from the first display module 120 enters the second PBS prism 112 and illuminates the light-incident surface of the second PBS prism 112. At this time, the incident angle is greater than the total internal reflection angle, realizing the total internal reflection of the P-polarized light. The P-polarized light that is totally reflected passes directly through the second bonding surface and exits from the light-exiting surface of the second PBS prism 112 into the projection lens module 200. Similarly, the reflected S-polarized light is also totally reflected at the light-incident surface of the second PBS prism 112. The totally reflected S-polarized light illuminates the second bonding surface, and after being reflected at the second bonding surface, it exits from the light-exiting surface of the second PBS prism 112 into the projection lens module 200.

[0109] In this embodiment, when the optical path module 300 adopts a single light source scheme, the optical path module 300 further includes a first light source module 330. The light input end of the P-polarized light path 310 is provided with a first polarization separation module 314, which can realize polarization separation. The first polarization separation module 314 is used to split the incident light emitted by the first light source module 330 into P-polarized light entering the P-polarized light path 310 and S-polarized light entering the S-polarized light path 320.

[0110] In this embodiment, specifically, the first polarization separation module 314 includes an inclined first polarization separation plate. The first polarization separation plate allows P-polarized light to pass directly through and then enter the P-polarized light optical path 310. S-polarized light is directly reflected after irradiating the polarization separation plate and then enters the S-polarized light optical path 320. In this way, the separated S-polarized light can be reused, thereby achieving the purpose of energy recovery.

[0111] Furthermore, the P-polarized light path 310 includes a first homogenizing and shaping module 313 and a first lens module 311 arranged sequentially along the propagation direction of the P-polarized light. The first homogenizing and shaping module 313 is located at the light-entry end of the P-polarized light path 310. Thus, the P-polarized light is homogenized and shaped by the first homogenizing and shaping module 313 before entering the first lens module 311 for focusing and then entering the beam splitting module 110.

[0112] The S-polarized light path 320 includes a first reflector 323, a second light-shaping module 324, and a second lens module 321 arranged sequentially along the S-polarized light propagation direction. The first reflector 323 is located at the light-inlet end of the S-polarized light path 320.

[0113] Specifically, the reflective surface of the first reflector 323 is parallel to the first polarization separation plate. Thus, the S-polarized light reflected from the first polarization separation plate will be reflected to the reflective surface of the first reflector 323, and then reflected by the reflective surface of the first reflector 323 into the second homogenizing and shaping module 324 for homogenization and shaping, and then into the second lens module 321 for focusing before entering the beam splitting module 110.

[0114] In this embodiment, the first homogenizing and shaping module 313 and the second homogenizing and shaping module 324 have the same structure, both including a compound eye lens. The compound eye lens is based on the imaging optics principle, which divides the beam of propagating polarized light (P-polarized light or S-polarized light) into multiple fine beams and uses the superposition of these fine beams to compensate for non-uniformity, thereby obtaining uniform light over a large area.

[0115] The first lens module 311 and the second lens module 321 described above each have at least one lens body, such as one, two, three, or other quantities. The number of lens bodies in the first lens module 311 and the second lens module 321 can be the same or different, and they are all arranged at intervals along a straight line. It is understood that the number of lens bodies can be set according to the projection requirements, and is not specifically limited in this embodiment.

[0116] Furthermore, in this embodiment, since the propagating P-polarized light and S-polarized light are respectively incident parallel to each other by two incident surfaces within the corresponding second PBS prism 112, the P-polarized light path 310 does not need to be equipped with a second polarization separation module 315, and the S-polarized light path 320 does not need to be equipped with a second reflector 325.

[0117] The projection device provided in this embodiment is based on a DLP display module. It uses a first polarization separation module 314 to split the same light source (provided by the first light source module 330) into P-polarized light and S-polarized light. The P-polarized light and S-polarized light form corresponding P-polarized light paths 310 and S-polarized light paths 320, respectively, thereby achieving light energy recovery and full utilization. Furthermore, through the structural layout design of the internal lens modules of the P-polarized light path 310 or S-polarized light path 320, the area of ​​the P-light illumination area on the first display module 120 can be equal to the area of ​​the S-light illumination area on the second display module 130, thus enhancing the brightness of the entire projection area; alternatively, the area of ​​the P-light illumination area on the first display module 120 can be larger than the area of ​​the S-light illumination area on the second display module 130, thus enhancing the local brightness of the projection area; and still others can have a smaller P-light illumination area than the area of ​​the S-light illumination area on the second display module 130, also enhancing the local brightness of the projection area. Thus, the projection device provided in this embodiment can be configured according to different application scenarios.

[0118] Example 6

[0119] Please see Figure 8 This embodiment provides a projection device. This embodiment is an improvement upon the technology of Embodiment Five described above. The difference between Embodiment Five and Embodiment Five lies in:

[0120] In this embodiment, the optical path module 300 adopts a dual-light source structure. Specifically, the optical path module 300 further includes a first light source module 330 and a second light source module 340. The first light source module 330 corresponds to the light input end of the P-polarized light path 310; the second light source module 340 corresponds to the light input end of the S-polarized light path 320. That is to say, the first light source module 330 provides a light source for the P-polarized light path 310, and the second light source module 340 provides a light source for the S-polarized light path 320.

[0121] The P-polarized light path 310 includes a first homogenizing and shaping module 313, a P-polarized light conversion module 316, and a first lens module 311 arranged sequentially along the propagation direction of P-polarized light. The first homogenizing and shaping module 313 is located at the light-inlet end of the P-polarized light path 310. The structures of the first homogenizing and shaping module 313 and the first lens module 311 are consistent with those in Embodiment 5 above, and will not be described again here. The P-polarized light conversion module 316 allows P-polarized light to pass through and is used to convert S-polarized light into P-polarized light.

[0122] The S-polarized light optical path 320 includes a second homogenizing and shaping module 324, an S-polarized light conversion module 326, and a second lens module 321 arranged sequentially along the propagation direction of the S-polarized light. The second homogenizing and shaping module 324 is located at the light-inlet end of the S-polarized light optical path 320. The structure of the second homogenizing and shaping module 324 and the second lens module 321 is consistent with that of Embodiment 5 above, and will not be described again here. The S-polarized light conversion module 326 allows S-polarized light to pass through and is used to convert P-polarized light into S-polarized light.

[0123] Compared to Embodiment 5, the P-polarized light path 310 and S-polarized light path 320 described above have an additional P-polarized light conversion module 316 and an S-polarized light conversion module 326. In this embodiment, both the P-polarized light conversion module 316 and the S-polarized light conversion module 326 are polarizing conversion systems (PCS).

[0124] Specifically, such as Figure 4 As shown, in the P-polarized light conversion module 316, half-wavelength plates are attached at intervals on the side of the polarization converter facing away from the first uniform light shaping module 313. P-polarized light enters the polarization converter and passes directly through the gap between two adjacent half-wavelength plates (without passing through the half-wavelength plates). S-polarized light enters the polarization converter, is reflected, and then illuminates the half-wavelength plates before being converted into P-polarized light and emitted.

[0125] like Figure 4 As shown, in the S-polarization conversion module 326, half-wavelength plates are attached at intervals on the side of the polarization converter facing away from the first uniform light shaping module 313. P-polarized light enters the polarization converter and directly illuminates the half-wavelength plates, where it is converted into S-polarized light and emitted. The P-polarized light, after entering the polarization converter, is reflected and passes through the gap between two adjacent half-wavelength plates (without passing through the half-wavelength plates).

[0126] This embodiment is an improvement on the technology of Embodiment 5 above. Therefore, the projection device provided in this embodiment has the same technical effect as that in Embodiment 5. Furthermore, the projection device provided in this embodiment uses a dual-source light source, where both S-polarized and P-polarized light from each source are converted and fully utilized, resulting in a brighter projection area compared to the single-source solution in Embodiment 2.

[0127] Example 7

[0128] Please see Figure 10 This embodiment provides a projection device. This embodiment is an improvement upon the technology of Embodiment 5 or Embodiment 6 described above. The difference between this embodiment and Embodiment 5 or Embodiment 6 lies in:

[0129] The projection device provided in this embodiment can adjust the size and position of the S-polarized light irradiation area on the second display module 130.

[0130] Specifically, the S-polarized light path 320 also includes a second adjustment module 322, which drives at least one second lens body connected to the second lens module 321. The second adjustment module 322 has X-axis translational degree of freedom, Y-axis translational degree of freedom and Z-axis translational degree of freedom.

[0131] Thus, the first adjustment module 312 can drive the corresponding second lens to move along the X, Y, and Z axes, thereby adjusting the size and position of the S-light illumination area on the second display module 130. Specifically, the second adjustment module 322 drives the second lens to move along the Z-axis to adjust the size of the S-light illumination area on the second display module 130, and the second adjustment module 322 drives the second lens to move along the X-axis or Y-axis to adjust the position of the S-light illumination area on the second display module 130 on the X-axis or Y-axis.

[0132] In this embodiment, the second lens module 321 schematically shows three second lens bodies, which are spaced apart along the Z-axis. The second adjustment module 322 can drive at least one of the two adjacent second lens bodies (the two second lens bodies spaced apart along the Z-axis), thereby causing at least one of the two adjacent second light-transmitting lenses to move and adjust along the X, Y, and Z axes. This ensures that the adjustment of the S-light illumination area achieves a better adjustment effect.

[0133] In some embodiments, the projection device can also adjust the size and position of the P-polarized light irradiation area on the first display module 120.

[0134] Specifically, the propagation path direction of P-polarized light in the P-polarized light path 310 is defined as the Z-axis direction. The P-polarized light path 310 also includes a first adjustment module 312, which drives at least one first lens body connected to the first lens module 311. The first adjustment module 312 has X-axis translational degree of freedom, Y-axis translational degree of freedom and Z-axis translational degree of freedom.

[0135] Thus, the first adjustment module 312 can drive the corresponding first lens to move along the X, Y, and Z axes, thereby adjusting the size and position of the P-light illumination area on the first display module 120. Specifically, the first adjustment module 312 drives the first lens to move along the Z-axis to adjust the size of the P-light illumination area on the first display module 120, and the first adjustment module 312 drives the first lens to move along the X-axis or Y-axis to adjust the position of the P-light illumination area on the first display module 120 on the X-axis or Y-axis.

[0136] In some embodiments, the first lens module 311 may arrange three first lens bodies at intervals along the Z-axis, and the first adjustment module 312 may drive at least one of two adjacent first lens bodies to move the two adjacent first light-transmitting lenses along the X, Y, and Z axes for adjustment. This ensures that the adjustment of the P-light irradiation area achieves a better adjustment effect.

[0137] In some embodiments, the projection device can simultaneously adjust the size and position of the P-polarized light illumination area on the first display module 120 and the S-polarized light illumination area on the second display module 130. The specific adjustment method is achieved by combining the adjustment methods for the S-polarized light illumination area and the P-polarized light illumination area.

[0138] Optionally, the first adjustment module 312 and the second adjustment module 322 described above can be selected as a three-axis adjustment platform with XYZ axis movement adjustment. Of course, other adjustment structures can also be used. This embodiment is only an example and is not intended to limit the scope of protection of this application.

[0139] The projection device provided in this embodiment is an improvement on the technology of Embodiment 5 or Embodiment 6 described above. Therefore, the projection device provided in this embodiment also possesses the technical effects of Embodiment 5 or Embodiment 6. Furthermore, the projection device provided in this embodiment, by adjusting the first lens and / or the second lens, achieves adjustment of the area size (Z-axis movement) and the XY-axis position (X-axis movement or Y-axis movement) of the P-polarized light irradiation area and / or S-polarized light irradiation area, thereby achieving adjustment of the overall brightness and local brightness of the projection area. Thus, the projection device provided in this embodiment has better adjustability, more flexible operation, and greater practicality.

[0140] Example 8

[0141] Please see Figures 1 to 10 This embodiment provides a head-up display device. The head-up display device can be applied in vehicles.

[0142] In this embodiment, the head-up display device uses the projection device provided in any one of the embodiments one to seven described above.

[0143] Thus, when the head-up display device provided in this embodiment is applied to a vehicle, it can form a projection area on the vehicle's windshield. This projection area can be fully illuminated or set to illuminate a local area.

[0144] It should be noted that, in this application, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0145] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0146] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0147] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0148] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A projection device, characterized by The application relates to a display module (100), a projection lens module (200) and a light path module (300). The display module (100) comprises a light splitting module (110), a first display module (120) and a second display module (130). The projection lens module (200) is arranged on the light exit surface of the light splitting module (110). The light path module (300) comprises a P-polarized light path (310) and an S-polarized light path (320) arranged on the light entrance surface of the light splitting module (110). The P-polarized light and the S-polarized light are reflected by the first display module (120) and the second display module (130) respectively, and then the reflected P-polarized light and S-polarized light are collected by the light splitting module (110) and emitted from the light exit surface of the light splitting module (110). The P-polarized light path (310) comprises a first lens module (311) and a first adjusting module (312).

2. The projection apparatus according to claim 1, wherein The first adjusting module (312) is drivingly connected to at least one first lens body in the first lens module (311). The first adjusting module (312) has X-axis movement freedom, Y-axis movement freedom and Z-axis movement freedom.

3. The projection apparatus according to claim 2, wherein The S-polarized light path (320) comprises a second lens module (321) and a second adjusting module (322). The second adjusting module (322) is drivingly connected to at least one second lens body in the second lens module (321).

4. The projection apparatus according to claim 3, wherein The second adjusting module (322) has X-axis movement freedom, Y-axis movement freedom and Z-axis movement freedom. The light path module (300) further comprises a first light source module (330) and a first polarized light separation module (314).

5. The projection apparatus according to claim 2, wherein The first polarized light separation module (314) is arranged on the light exit end of the first light source module (330) and the light entrance end of the P-polarized light path (310). The P-polarized light path (310) further comprises a first uniform light shaping module (313) and a first lens module (311) arranged in sequence along the P-polarized light propagation direction. The first uniform light shaping module (313) is located between the first lens module (311) and the first polarized light separation module (314). The S-polarized light path (320) further comprises a first reflector (323), a second uniform light shaping module (324) and a second lens module (321) arranged in sequence along the S-polarized light propagation direction. The first reflector (323) is located on the light entrance end of the S-polarized light path (320). The light path module (300) further comprises a first light source module (330) and a second light source module (340). The first light source module (330) corresponds to the light entrance end of the P-polarized light path (310). The second light source module (340) corresponds to the light entrance end of the S-polarized light path (320).

6. The projection apparatus according to claim 5, wherein The P-polarized light path (310) further comprises, along the propagation direction of the P-polarized light, a first uniform light shaping module (313), a P-polarized light conversion module (316) and a first lens module (311) arranged in sequence, and the first uniform light shaping module (313) is located at the light inlet end of the P-polarized light path (310). The S-polarized light path (320) further comprises, along the propagation direction of the S-polarized light, a second uniform light shaping module (324), an S-polarized light conversion module (326) and a second lens module (321) arranged in sequence, and the second uniform light shaping module (324) is located at the light inlet end of the S-polarized light path (320).

7. The projection apparatus according to any one of claims 1-5, wherein, The first display module (120) and the second display module (130) are both LCOS display modules, the light splitting module (110) is a first PBS prism (111), the first PBS prism (111) has a first bonding surface coated with a polarization light splitting film therein, and the included angle between the first bonding surface and the light inlet surface of the first PBS prism (111) is 45°; wherein the P-polarized light can penetrate the first bonding surface, and the S-polarized light can be reflected by the first bonding surface.

8. The projection apparatus according to claim 7, wherein The P-polarized light path (310) further comprises a second polarization light separation module (315), the second polarization light separation module (315) is arranged at the light outlet end of the P-polarized light path (310), and the light outlet surface of the second polarization light separation module (315) faces the light splitting module (110). The S-polarized light path (320) further comprises a second mirror (325), the second mirror (325) is arranged at the light outlet end of the S-polarized light path (320), and the reflecting surface of the second mirror (325) faces the light outlet surface of the second polarization light separation module (315). The light outlet surface of the second polarization light separation module (315) can reflect S-polarized light.

9. The projection apparatus according to any one of claims 1-5, wherein, The first display module (120) and the second display module (130) are set as display modules of the same reflection principle. The first display module (120) and the second display module (130) are both DLP display modules, the light splitting module (110) is a second PBS prism (112), the second PBS prism (112) has two coplanar light inlet surfaces and a second bonding surface without a polarization light splitting film, and the included angle between the second bonding surface and the two light inlet surfaces of the second PBS prism (112) is both 90°. The P-polarized light can penetrate the second bonding surface, and the S-polarized light can be reflected by the second bonding surface.

10. A head-up display device, characterized by comprising: The projection device according to any one of claims 1-9. The projection device according to any one of claims 1-9.

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