Optical system, projection display device, and transport vehicle

Abstract

The utility model relates to an optical system, a projection display device and a transport carrier. The optical system is applied to the projection display device with an image source module. The optical system comprises a light splitting module and a beam expanding module. The light splitting module comprises a first light splitting unit and a second light splitting unit which are arranged in parallel. The image source light beam is reflected to the first light splitting unit after being expanded by the beam expanding module; the first light splitting unit transmits part of the image source light beam to form a first virtual image and reflects part of the image source light beam to form a first reflected light beam, and the first reflected light beam can be conducted to the second light splitting unit; the second light splitting unit reflects the first reflected light beam and forms a second virtual image, and the imaging distances of the first virtual image and the second virtual image are different. The optical system in the embodiment can simultaneously form at least two virtual images with different imaging distances, so that the at least two virtual images can be presented by using a relatively simple structure, and the presented image layers are relatively abundant.

Description

Technical Field

[0001] The present application relates to the technical field of projection display systems, and in particular to an optical system, a projection display device and a transport vehicle. Background Art

[0002] With the advancement of technology, more and more vehicles are equipped with head-up display systems. The head-up display system can project the car's speed, rotation speed, navigation and other information onto the windshield. The driver can get key information about the car without taking his eyes off the front, thereby improving driving safety.

[0003] However, the current head-up display system includes an image source and a reflector, wherein the image source is used to emit an image beam, and the reflector is used to reflect the image beam to the windshield to form a virtual image for the driver to see. Since the traditional reflector has a relatively single effect on the light beam, after reflection, a virtual image with a fixed imaging distance is formed, and the content of the virtual image is relatively flat, and the display effect is relatively simple. Utility Model Content

[0004] The present application provides an optical system, a projection display device and a transport vehicle.

[0005] In a first aspect, the present application provides an optical system, which is applied to a projection display device having an image source module, wherein the image source module is used to emit an image source light beam; the optical system includes a spectroscopic module and a beam expansion module, wherein the spectroscopic module includes a first spectroscopic unit and a second spectroscopic unit arranged in parallel; the beam expansion module is suitable for being arranged on the optical path of the image source light beam, and after the image source light beam passes through the beam expansion effect of the beam expansion module, it is reflected by the beam expansion module to the first spectroscopic unit; the first spectroscopic unit is used to transmit part of the image source light beam to form a first projection light beam, and transmit the first projection light beam to a target imaging carrier to form a first virtual image; the first spectroscopic unit is also used to reflect part of the image source light beam to form a first reflected light beam, and transmit the first reflected light beam to the second spectroscopic unit; the second spectroscopic unit is used to reflect at least part of the first reflected light beam to form a second projection light beam, and transmit the second projection light beam to the target imaging carrier to form a second virtual image, and the imaging distances of the first virtual image and the second virtual image are different.

[0006] Among them, in some optional embodiments, the first light splitting unit includes a first light receiving surface, the first light receiving surface is provided with a first optical film layer, the first optical film layer is used to reflect part of the image source light beam and transmit part of the image source light beam; the second light splitting unit includes a second light receiving surface, the first light receiving surface is provided with a second optical film layer, and the second optical film layer is used to reflect at least part of the first reflected light beam.

[0007] Among them, in some optional embodiments, the first optical film layer is a semi-transparent and semi-reflective film; or / and, the first optical film layer is a polarizing film, the first optical film layer is used to transmit light of a first polarization state to form a first projection light beam, and is used to reflect light of a second polarization state to form a first reflected light beam, and the first polarization state and the second polarization state are different.

[0008] Among them, in some optional embodiments, the second optical film layer is a semi-transparent and semi-reflective film, and the semi-transparent and semi-reflective film is also used to transmit part of the first reflected light beam; there are multiple second spectroscopic units, and the multiple second spectroscopic units are arranged in sequence along the optical path of the first reflected light beam on one side of the first spectroscopic unit to receive the first reflected light beam in sequence; each second spectroscopic unit is used to reflect light to form a corresponding second virtual image, and to transmit light to the next second spectroscopic unit on the optical path of the first reflected light beam; the imaging distances of the multiple second virtual images formed by the multiple second spectroscopic units are different.

[0009] In some optional embodiments, the second optical film layer is a total reflection film.

[0010] Among them, in some optional embodiments, the first optical film layer is a polarizing film, the first optical film layer is used to transmit light of a first polarization state to form a first projection light beam, and is used to reflect light of a second polarization state to form a first reflected light beam, and the first polarization state and the second polarization state are different; the second optical film layer is a polarizing film, and the second optical film layer is used to reflect light of a second polarization state to form a second projection light beam.

[0011] Among them, in some optional embodiments, the range of the incident angle of the image source light beam on the first optical film layer is: greater than or equal to 30° and less than or equal to 60°; or / and, the range of the incident angle of the first reflected light beam on the second optical film layer is: greater than or equal to 30° and less than or equal to 60°.

[0012] Among them, in some optional embodiments, the first light splitting unit includes a first light-transmitting body, and the first light-receiving surface is limited inside the first light-transmitting body; the second light splitting unit includes a second light-transmitting body, and the second light-receiving surface is limited inside the second light-transmitting body, and the second light-transmitting body is connected in parallel with the first light-transmitting body along the transmission direction of the first reflected light beam.

[0013] Among them, in some optional embodiments, the optical system also includes a beam folding module, which is arranged on the optical path of the image source light beam. After the image source light beam passes through the folding action of the beam folding module, the optical path of the image source light beam is folded so that the image source light beam is transmitted to the beam expansion module.

[0014] In some optional embodiments, the beam folding module includes at least one of the following optical elements: a plane reflector and a curved reflector.

[0015] In some optional embodiments, the beam expansion module includes at least one of the following optical elements: a concave reflector and a convex reflector.

[0016] In a second aspect, the present application provides a projection display device, which includes an image source module and the optical system mentioned above, wherein the image source module is used to emit an image source light beam; and the optical system is located on the optical path of the image source light beam.

[0017] In a third aspect, the present application provides a transport vehicle, the transport vehicle comprising a body, a windshield and the projection display device described above. The windshield is mounted on the body, and the projection display device is used to project on the windshield to form a first virtual image and a second virtual image.

[0018] The present application provides an optical system, which is applied to a projection display device having an image source module, and the image source module can emit an image source light beam. The optical system includes a splitter module and a beam expansion module. The beam expansion module is arranged on the optical path of the image source light beam, and the beam expansion module has a beam expansion effect and a reflection effect on the image source light beam. Specifically, after the image source light beam passes through the beam expansion effect of the beam expansion module, it is reflected to the splitter module by the beam expansion module. The splitter module includes a first splitter unit and a second splitter unit arranged in parallel, the first splitter unit is used to transmit part of the image source light beam to form a first projection light beam, and transmit the first projection light beam to a target imaging carrier to form a first virtual image; the first splitter unit is also used to reflect part of the image source light beam to form a first reflected light beam, and transmit the first reflected light beam to the second splitter unit; the second splitter unit is used to reflect at least part of the first reflected light beam to form a second projection light beam, and transmit the second projection light beam to the target imaging carrier to form a second virtual image, and the imaging distances of the first virtual image and the second virtual image are different.

[0019] In the optical system provided in the present application, the spectroscopic module includes at least a first spectroscopic unit and a second spectroscopic unit arranged in parallel, so as to form two projection light beams and transmit them to the windshield to form two virtual images, wherein the relative position and relative distance of the first spectroscopic unit relative to the windshield are different from the relative position and relative distance of the second spectroscopic unit relative to the windshield, so the imaging distances of the two virtual images are different, so the presented image layers are richer, the information display effect is relatively good, and the structure on which its implementation depends is also relatively simple.

[0020] Furthermore, in this embodiment, images with richer layers can be used to carry a variety of different information, which is conducive to making the information displayed by the display device more diverse. As an example, the content of the two virtual images can be set to be the same, for example, it can be an indicator arrow or a lane line. In the process of real scene fusion, the two virtual images that are closer and farther can cooperate and correspond to longer sections of the environment, which helps the driver understand the road conditions and improves the navigation effect. In this embodiment, the content of the two virtual images can also be set to be different. For example, the imaging content of one of the virtual images can be the speed, fuel level, etc. of the transport vehicle, and the imaging content of the other virtual image can be a road indicator sign, such as a lane line, an indicator arrow, a warning sign, etc., so as to provide the driver with more road information and information about the transport vehicle at the same time, so as to improve the driver's understanding of the transport vehicle and road conditions. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 It is a schematic diagram of the structure of the transport vehicle provided in an embodiment of the present application.

[0023] Figure 2 yes Figure 1 The structural schematic diagram of the projection display device shown.

[0024] Figure 3 yes Figure 2 The structure diagram of the optical module of the projection display device is shown.

[0025] Figure 4 yes Figure 2 The schematic diagram of the structure of the light splitting module of the projection display device is shown.

[0026] Figure 5 yes Figure 2 The schematic diagram of the structure of the light splitting module of the projection display device shown has a plurality of second light splitting units.

[0027] Figure 6 yes Figure 2 The optical module of the projection display device shown is a structural schematic diagram of a light beam folding module.

[0028] Figure numbers: 1000, transport vehicle, 900, fuselage, 910, cockpit, 800, windshield, 810, projection imaging surface, 100, projection display device, 20, image source module, 10, optical system, 110, spectroscopic module, 1110, first spectroscopic unit, 1111, first light-transmitting body, 1112, first light-receiving surface, 1113, first optical film layer, 1114, first projection light beam, 1115, first virtual image, 1116, first reflected light beam, 1117, first incident surface, 1120, second spectroscopic unit, 1121, first light-transmitting body, 1122, first light-receiving surface, 1123, second optical film layer, 1124, second projection light beam, 1125, second virtual image, 1126, second incident surface, 120, beam expansion module, 130, beam folding module. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0030] See also Figure 1 The embodiment of the present application provides an optical system 10, a projection display device 100 provided with the optical system 10, and a transport vehicle 1000 equipped with the projection display device 100. The transport vehicle 1000 in this embodiment may be a land vehicle such as a car, a truck or a racing car. The transport vehicle 1000 may include a body 900 and a windshield 800, wherein the body 900 is the main structure of the transport vehicle 1000, and the internal space of the body 900 may be divided into a cockpit 910, a passenger compartment, a cargo compartment and other space areas according to the function, wherein the cockpit 910 is used for the driver to sit and is located at the front end of the internal space of the body 900 in the forward direction of the transport vehicle 1000. The body 900 is provided with an observation window connected to the cockpit 910 on the front side in the forward direction, and the windshield 800 is embedded in the observation window so that the driver can observe the road conditions through the observation window.

[0031] See also Figure 1 and Figure 2The transport vehicle 1000 in this embodiment may also include a projection display device 100, which is installed in the cockpit 910. The projection display device 100 can cooperate with the windshield 800 to form at least two virtual images. Specifically, the windshield 800 serves as a target imaging carrier, and defines a projection imaging surface 810 on the side facing the cockpit 910. The projection display device 100 can emit at least two light beams, and at least two light beams are transmitted to the projection imaging surface 810 on the windshield 800. The windshield 800 reflects at least two light beams to the human eye, and the human eye can observe at least two virtual images. In this embodiment, the imaging contents of the at least two virtual images may be the same or different. As an example, the imaging contents of the two virtual images are the same, for example, they may both be road signs (such as guide arrows, lane lines, etc.). As another example, the imaging contents of at least two virtual images may also be different. For example, the imaging content of one of the virtual images may be the speed, fuel level, etc. of the transport vehicle 1000, and the imaging content of the other virtual images may be road signs, such as lane lines, arrows, warning signs, etc.

[0032] See also Figure 2 In this embodiment, the projection display device 100 includes an image source module 20 and an optical system 10. The image source module 20 is used to emit an image source beam, and the optical system 10 is located on the optical path of the image source beam. The optical system 10 can perform light splitting processing on the image source beam to form at least two projection beams, and the projection beam can transmit at least two projection beams to the windshield 800 and form at least two virtual images. This embodiment does not limit the type of the image source module 20. As an example, the image source module 20 can be an image generator, which can emit an image source beam; as another example, the image source module 20 can include an image display source and an illuminating lamp (such as a laser lamp, an LED lamp), and the illuminating lamp emits illuminating light to illuminate the image display source to form the image source beam mentioned above.

[0033] See also Figure 2 and Figure 3In this embodiment, the optical system 10 includes a beam splitter module 110, which is used to perform beam splitting processing on the image source beam and form at least two projection beams. The optical system 10 may also include a beam expansion module 120, which is arranged on the optical path of the image source beam. The beam expansion module 120 receives the image source beam before the beam splitter module 110, and the beam expansion module 120 is used to expand the image source beam to increase the beam area of ​​the image source beam, and transmit the image source beam to the beam splitter module 110. Under the setting of this embodiment, it is possible to avoid the beam area of ​​the projection beam being too small, resulting in the virtual image size of the projection beam after the beam splitting processing being too small, and the power density and irradiance of the image source beam can be reduced, so as to avoid the beam expansion module 120 and the beam splitter module 110 being irradiated by an excessively strong image source beam, so as to extend the life of the beam expansion module 120 and the beam splitter module 110. This embodiment does not limit the type of the beam expansion module 120. As an example, the beam expansion module 120 may be a concave reflector, which can adjust the distance between the concave reflector and the beam splitter module 110 to achieve the function of expanding the image source beam, and the concave reflector can also reflect the image source beam to the beam splitter module 110. As another embodiment, the beam expansion module 120 may be a convex reflector, which can expand the image source beam and reflect the image source beam to the beam splitter module 110.

[0034] See also Figure 2 and Figure 3 In this embodiment, the light splitting module 110 at least includes a first light splitting unit 1110 and a second light splitting unit 1120. After the image source light beam passes through the beam expansion effect of the beam expansion module 120, the optical path is changed and it is sequentially transmitted to the first light splitting unit 1110 and the second light splitting unit 1120 to form two projection light beams. Specifically, the image source light beam is transmitted to the first light splitting unit 1110, and the first light splitting unit 1110 can transmit part of the image source light beam and form a first projection light beam 1114. The first projection light beam 1114 is transmitted to the projection imaging surface 810 of the windshield 800 and forms a first virtual image 1115. The first light splitting unit 1110 can also reflect part of the image source light beam, and the part of the image source light beam is reflected by the first light splitting unit 1110 to form a first reflected light beam 1116, and the first reflected light beam 1116 can be transmitted to the second light splitting unit 1120.

[0035] The second beam splitter 1120 has a reflective effect on the first reflected light beam 1116. After the first reflected light beam 1116 is transmitted to the second beam splitter 1120, it is reflected by the second beam splitter 1120. After the first reflected light beam 1116 is reflected by the second beam splitter 1120, it forms a second projection light beam 1124. The second projection light beam 1124 is transmitted to the projection imaging surface 810 and forms a second virtual image 1125. It should be understood that the first projection light beam 1114 and the second projection light beam 1124 are partial light beams in the image source light beam, wherein the optical path of the second projection light beam 1124 is different from the optical path of the first projection light beam 1114, the imaging distance of the second virtual image 1125 is different from the imaging distance of the first virtual image 1115, and the imaging distance of the second virtual image 1125 is farther than the imaging distance of the first virtual image 1115. In other embodiments, more beam splitters can be provided to form more projection light beams with different optical paths and more virtual images with different imaging distances.

[0036] In summary, in the optical system 10 provided in the present application, the spectroscopic module 110 includes at least a first spectroscopic unit 1110 and a second spectroscopic unit 1120 arranged in parallel, so as to form two projection light beams and transmit them to the windshield 800 to form two virtual images, wherein the relative position and relative distance of the first spectroscopic unit 1110 relative to the windshield 800 are different from the relative position and relative distance of the second spectroscopic unit 1120 relative to the windshield 800, so the imaging distances of the two virtual images are different, so the presented image layers are richer, the information display effect is relatively good, and the structure on which its implementation depends is also relatively simple.

[0037] Furthermore, in this embodiment, two virtual images with richer layers can be used to carry a variety of different information, which is conducive to making the information displayed by the display device more diverse. As an example, the content of the two virtual images can be set to be the same, for example, it can be an indicator arrow or a lane line. In the process of real scene fusion, the two virtual images that are closer and farther can cooperate and correspond to longer sections of the environment, which helps the driver understand the road conditions and improves the navigation effect. In this embodiment, the content of the two virtual images can also be set to be different. For example, the imaging content of one of the virtual images can be the speed, fuel volume, etc. of the transport vehicle 1000, and the imaging content of the other virtual image can be a road indicator sign, such as a lane line, an indicator arrow, a warning sign, etc., so as to provide the driver with more road information and information about the transport vehicle 1000 at the same time, so as to improve the driver's understanding of the transport vehicle 1000 and the road conditions.

[0038] See also Figure 3 and Figure 4, this embodiment does not limit the type of the first light splitting unit 1110, and the first light splitting unit 1110 can be an optical device such as a diffractive optical element, a polygonal mirror or a polygonal prism. In this embodiment, the first light splitting unit 1110 includes a first light receiving surface 1112, and the image source light beam can be transmitted to the first light receiving surface 1112 after the turning effect of the beam expansion module 120. The first light splitting unit 1110 can also include a first light-transmitting body 1111, and the first light receiving surface 1112 is located inside the first light-transmitting body 1111. This application does not limit the position of the first light receiving surface 1112 on the first light-transmitting body 1111, and it can be specifically set according to the type of the first light-transmitting body 1111. For example, the first light-transmitting body 1111 in this embodiment includes two identical right-angle prisms, and the oblique surfaces of the two right-angle prisms are attached to each other and define the first light receiving surface 1112. Therefore, in this embodiment, the first light receiving surface 1112 is located inside the first light-transmitting body 1111. In other embodiments, the first light-transmitting body 1111 may be a transparent glass plate, and the first light-receiving surface 1112 may be located on the surface of the transparent glass plate. In this embodiment, a first optical film layer 1113 is disposed on the first light-receiving surface 1112, and the first optical film layer 1113 may be clamped by the two right-angle prisms mentioned above, or may be plated or attached to an inclined surface of one of the right-angle prisms. In this embodiment, the first optical film layer 1113 is used to transmit part of the image source light beam to form a first projection light beam 1114, and is also used to reflect part of the image source light beam to change the optical path of the image source light beam, and the reflected image source light beam forms a first reflected light beam 1116, and the first reflected light beam 1116 is transmitted toward the second light splitting unit 1120.

[0039] In this embodiment, the reflectivity range of the first optical film layer 1113 to the image source light beam is: greater than or equal to 25% and less than or equal to 75%. For example, the reflectivity of the first optical film layer 1113 to the image source light beam can be 25%, 30%, 40%, 50%, 60%, 70%, 75%, etc. In some embodiments, the reflectivity range of the first optical film layer 1113 to the image source light beam is related to the incident angle α of the image source light beam on the first optical film layer 1113, and the two are roughly inversely proportional, which will be described in detail below.

[0040] See also Figure 4, the incident angle α of the image source light beam on the first optical film layer 1113 can be adjusted according to the actual application requirements. For example, the position of the image source module 20 or the beam expansion module 120 can be changed by using the light splitting module 110 as a reference, so that the optical path of the image source light beam is changed, and then the incident angle α of the image source light beam on the first optical film layer 1113 is changed. The range of the incident angle α of the image source light beam on the first optical film layer 1113 is: greater than or equal to 30° and less than or equal to 60°. For example, the incident angle α of the image source light beam on the first optical film layer 1113 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. As an example, when the incident angle α is 30°, the reflectivity of the first optical film layer 1113 to the image source light beam is relatively high (approximately about 75%). As another example, when the incident angle α is 60°, the reflectivity of the first optical film layer 1113 to the image source light beam is relatively low (approximately about 25%). As another embodiment, when the incident angle α is 45°, the reflectivity of the first optical film layer 1113 to the image source light beam is approximately 50%.

[0041] In this embodiment, the first light-transmitting body 1111 has a first incident surface 1117, and the first incident surface 1117 is a right-angled surface of the right-angle prism mentioned above. The angle between the first incident surface 1117 and the first optical film layer 1113 ranges from greater than or equal to 30° to less than or equal to 60°. For example, the angle between the first incident surface 1117 and the first optical film layer 1113 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. In this embodiment, the image source light beam can be vertically incident on the first incident surface 1117, which can reduce the reflection of the image source light beam by the first incident surface 1117 and reduce the light loss of the image source light beam during the transmission process. In this embodiment, when the angle between the first incident surface 1117 and the first optical film layer 1113 is 30°, the incident angle α is 30°; when the angle between the first incident surface 1117 and the first optical film layer 1113 is 45°, the incident angle α is 45°; when the angle between the first incident surface 1117 and the first optical film layer 1113 is 60°, the incident angle α is 60°.

[0042] See also Figure 3 and Figure 4, this embodiment does not limit the type of the second light splitting unit 1120, and the second light splitting unit 1120 can be an optical device such as a diffractive optical element, a polygonal mirror or a polygonal prism. In this embodiment, the second light splitting unit 1120 includes a second light receiving surface 1122, and the first reflected light beam 1116 can be transmitted to the second light receiving surface 1122. The second light splitting unit 1120 can also include a second light-transmitting body 1121, and the second light receiving surface 1122 is located inside the second light-transmitting body 1121. This application does not limit the position of the second light receiving surface 1122 on the second light-transmitting body 1121, and it can be specifically set according to the type of the second light-transmitting body 1121. For example, the second light-transmitting body 1121 in this embodiment includes two identical right-angle prisms, and the oblique surfaces of the two right-angle prisms are attached to each other and define the second light receiving surface 1122. Therefore, the second light receiving surface 1122 in this embodiment is located inside the second light-transmitting body 1121. In other embodiments, the second light-transmitting body 1121 may be a transparent glass plate, and the second light-receiving surface 1122 may be located on the surface of the transparent glass plate. In this embodiment, a second optical film layer 1123 is disposed on the second light-receiving surface 1122, and the second optical film layer 1123 may be clamped by the two right-angle prisms mentioned above, or may be plated or attached to an inclined surface of one of the right-angle prisms. In this embodiment, the second optical film layer 1123 is used to reflect at least part of the image source light beam to form a second projection light beam 1124.

[0043] See also Figure 3 and Figure 4 In this embodiment, the second light-transmitting body 1121 and the first light-transmitting body 1111 are connected in parallel (such as bonding or splicing) along the transmission direction of the first reflected light beam 1116. After the second light-transmitting body 1121 and the first light-transmitting body 1111 are connected, they are roughly an integrated structure such as a flat lens or a curved lens, so that the structure of the light-splitting module 110 is more compact, which is convenient for installing the light-splitting module 110 and makes the space occupied by the light-splitting module 110 smaller. As can be seen from the foregoing, in this embodiment, the first light-splitting unit 1110 formed by splicing two right-angle prisms and the second light-splitting unit 1120 formed by splicing two right-angle prisms are connected and fitted, so that the first reflected light beam 1116 can be transmitted in the prism, avoiding the first reflected light beam 1116 from being transmitted in the air, and reducing the light loss during the transmission of the first reflected light beam 1116.

[0044] In this embodiment, the reflectivity range of the second optical film layer 1123 to the first reflected light beam 1116 is: greater than or equal to 25% and less than or equal to 75%. For example, the reflectivity of the second optical film layer 1123 to the image source light beam can be 25%, 30%, 40%, 50%, 60%, 70%, 75%, etc. Among them, the reflectivity range of the second optical film layer 1123 to the first reflected light beam 1116 is related to the incident angle α of the first reflected light beam on the first optical film layer 1113, and the two are roughly inversely proportional, which will be described in detail below.

[0045] See also Figure 4 In this embodiment, the range of the incident angle β of the first reflected light beam 1116 on the second optical film layer 1123 is: greater than or equal to 30° and less than or equal to 60°. As an example, when the incident angle β is 30°, the reflectivity of the second optical film layer 1123 to the first reflected light beam 1116 is relatively high (approximately around 75%). As another example, when the incident angle β is 60°, the reflectivity of the second optical film layer 1123 to the first reflected light beam 1116 is relatively low (approximately around 25%). As another example, when the incident angle β is 45°, the reflectivity of the second optical film layer 1123 to the first reflected light beam 1116 is approximately around 50%.

[0046] See also Figure 4In this embodiment, the second light-transmitting body 1121 has a second incident surface 1126, and the first reflected light beam 1116 enters the second light-transmitting body 1121 via the second incident surface 1126. As can be seen from the foregoing, the second incident surface 1126 is a right-angled surface of one of the right-angle prisms included in the second light-transmitting body 1121, and the right-angled surface is attached to the first light-transmitting body 1111. It should be understood that the different shapes of the two right-angle prisms included in the second light-transmitting body 1121 will result in different angles between the second incident surface 1126 and the second optical film layer 1123, thereby affecting the incident angle β of the first reflected light beam 1116 on the second optical film layer 1123. In this embodiment, the angle between the second incident surface 1126 and the second optical film layer 1123 is in the range of greater than or equal to 30° and less than or equal to 60°, and the angle between the second incident surface 1126 and the second optical film layer 1123 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. In this embodiment, the angle between the first incident surface 1117 and the first optical film layer 1113 can be set to 45°, and the image source beam is vertically incident on the first incident surface 1117, the first optical film layer 1113 reflects part of the image source beam to form a first reflected beam 1116, the first reflected beam 1116 is vertically emitted from the vertical prism surface adjacent to the first incident surface 1117, and vertically incident on the second incident surface 1117, in the process of the image source beam being transmitted from the first light splitting unit 1110 to the second light splitting unit 1120, the light loss of the image source beam during the transmission process is low. In this embodiment, when the angle between the second incident surface 1126 and the second optical film layer 1123 is 30°, the incident angle β is 30°; when the angle between the second incident surface 1126 and the second optical film layer 1123 is 45°, the incident angle β is 45°; when the angle between the second incident surface 1126 and the second optical film layer 1123 is 60°, the incident angle β is 60°.

[0047] This embodiment does not limit the types of the first optical film layer 1113 and the second optical film layer 1123, which can be selected according to actual projection requirements and the structure of each component in the optical system 10. The first optical film layer 1113 and the second optical film layer 1123 cooperate with each other to achieve the purpose of forming multiple virtual images. This application provides multiple embodiments, which will be introduced one by one below.

[0048] See also Figure 3 and Figure 4In the first embodiment, the light splitting module 110 includes a first light splitting unit 1110 and a second light splitting unit 1120. The first optical film layer 1113 is a semi-transmissive and semi-reflective film, and the second optical film layer 1123 is a total reflection film. After the image source light beam is transmitted to the first optical film layer 1113, the first optical film layer 1113 transmits part of the image source light beam to form a first projection light beam 1114, and the first optical film layer 1113 reflects part of the image source light beam to change the optical path of the image source light beam. The reflected image source light beam forms a first reflection light beam 1116 and is transmitted to the second optical film layer 1123. The second optical film layer 1123 can reflect the first reflection light beam 1116 as much as possible and form a second projection light beam 1124. In the first embodiment, the light splitting module 110 can form two projection beams, and the two virtual images formed by the two projection beams have the same content. The second optical film layer 1123 is a total reflection film, which can ensure that the light intensity of the second projection beam 1124 is close to the light intensity of the first projection beam 1114, thereby making the brightness of the first virtual image 1115 and the second virtual image 1125 close, which is convenient for the driver to observe. In the first embodiment, the first light splitting unit 1110 can be provided with multiple, after the image source beam is transmitted to the first optical film layer 1113 of the first first light splitting unit 1110, the first optical film layer 1113 transmits part of the image source beam and reflects part of the image source beam, and the reflected image source beam forms a first reflected beam 1116, and multiple first light splitting units 1110 are arranged in sequence along the optical path of the first reflected beam 1116, and the second light splitting unit 1120 is connected to the last first light splitting unit 1110 on the optical path of the first reflected beam 1116.

[0049] See also Figure 5In the second embodiment, the light splitting module 110 includes a first light splitting unit 1110 and a plurality of second light splitting units 1120, and the plurality of second light splitting units 1120 are arranged and connected on one side of the first light splitting unit 1110 according to the optical path of the first reflected light beam 1116. In the second embodiment, the first optical film layer 1113 is a semi-transparent and semi-reflective film, and the second optical film layer 1123 of each second light splitting unit 1120 is also a semi-transparent and semi-reflective film. After the image source light beam is transmitted to the first optical film layer 1113, the first optical film layer 1113 transmits part of the image source light beam to form a first projection light beam 1114, and the first optical film layer 1113 reflects part of the image source light beam to change the optical path of the image source light beam, and the reflected image source light beam forms a first reflected light beam 1116. The first reflected light beam 1116 can be transmitted to each second optical film layer 1123 in sequence. Specifically, the first reflected light beam 1116 is first transmitted to the second optical film layer 1123 of the second splitting unit 1120 directly connected to the first splitting unit 1110. The second optical film layer 1123 reflects part of the first reflected light beam 1116 to the windshield 800 to form a second virtual image 1125 and transmits part of the first reflected light beam 1116 to be transmitted to the second optical film layer 1123 of the next second splitting unit 1120, and so on, so that the first reflected light beam 1116 is transmitted to each second splitting unit 1120 in sequence to form a plurality of second virtual images 1125, wherein the imaging distances of the plurality of second virtual images 1125 are different, and the plurality of second virtual images 1125 are arranged in sequence from near to far.

[0050] In the second embodiment, a plurality of second light splitting units 1120 are provided and each second light splitting unit 1120 is provided with a semi-transparent and semi-reflective film. The plurality of second light splitting units 1120 can form a plurality of second virtual images 1125 with different imaging distances and the same content. The imaginary content and imaging distance of each second virtual image 1125 are different from those of the first virtual image 1115. The plurality of second virtual images 1125 cooperate with the first virtual image 1115 to correspond to a longer road section in the environment, further improving the navigation effect. In the second embodiment, a second light splitting unit 1120 farthest from the first light splitting unit 1110 can be provided with a total reflection film, so that the second virtual image 1125 formed by the second light splitting unit 1120 has sufficient brightness, so that the driver can recognize the content of each second virtual image 1125.

[0051] See also Figure 4In the third embodiment, the light splitting module 110 includes a first light splitting unit 1110 and a second light splitting unit 1120. The first optical film layer 1113 is a polarizing film, and the second optical film layer 1123 is a total reflection film. After the image source light beam is transmitted to the first optical film layer 1113, the polarizing film transmits the light of the first polarization state in the image source light beam and forms a first projection light beam 1114, and the first projection light beam 1114 is transmitted to the windshield 800 and forms a first virtual image 1115. The polarizing film reflects the light of the second polarization state in the image source light beam to form a first reflected light beam 1116, wherein the first polarization state and the second polarization state are different. The first reflected light beam 1116 can be transmitted to the second optical film layer 1123, and the second optical film layer 1123 can reflect the first reflected light beam 1116 as much as possible and form a second projection light beam 1124. In the third embodiment, the polarizing film can be provided to improve the composition flexibility of multiple virtual images in the optical system 10. The contents of the two virtual images formed by the two projection light beams can be set to be the same to correspond to a longer road section in the environment, or they can be set to be different to provide more information to the driver so that the driver can understand the vehicle and road conditions. In addition, the second optical film layer 1123 is a total reflection film, which can ensure the light intensity of the second projection light beam 1124, which is convenient for the driver to observe.

[0052] See also Figure 5In the fourth embodiment, the light splitting module 110 includes a first light splitting unit 1110 and a plurality of second light splitting units 1120, and the plurality of second light splitting units 1120 are arranged and connected on one side of the first light splitting unit 1110 according to the optical path of the first reflected light beam 1116. In the second embodiment, the first optical film layer 1113 is a polarizing film, and the second optical film layer 1123 of each second light splitting unit 1120 is a semi-transmissive and semi-reflective film. After the image source light beam is transmitted to the first optical film layer 1113, the first optical film layer 1113 transmits the light of the first polarization state in the image source light beam to form a first projection light beam 1114, and the first optical film layer 1113 reflects the light of the second polarization state in the image source light beam to change the optical path of the light of the second polarization state, and the reflected light of the second polarization state forms a first reflected light beam 1116, wherein the first polarization state and the second polarization state are different. The first reflected light beam 1116 can be transmitted to each second optical film layer 1123 in sequence. Specifically, the first reflected light beam 1116 is first transmitted to the second optical film layer 1123 of the second splitting unit 1120 directly connected to the first splitting unit 1110. The second optical film layer 1123 reflects part of the first reflected light beam 1116 to the windshield 800 to form a second virtual image 1125 and transmits part of the first reflected light beam 1116 to be transmitted to the second optical film layer 1123 of the next second splitting unit 1120, and so on, so that the first reflected light beam 1116 is transmitted to each second splitting unit 1120 in sequence to form multiple second virtual images 1125 with the same content, wherein the imaging distances of the multiple second virtual images 1125 are different, and the multiple second virtual images 1125 are arranged in sequence from near to far.

[0053] In the fourth embodiment, a plurality of second light splitting units 1120 are provided and each second light splitting unit 1120 is provided with a semi-transparent and semi-reflective film. The plurality of second light splitting units 1120 can form a plurality of second virtual images 1125 with different imaging distances and the same content. The imaging distances of the first virtual image 1115 and the plurality of second virtual images 1125 are different. In this embodiment, by providing a polarizing film, the composition flexibility of the plurality of virtual images in the optical system 10 can be improved. The content of the first virtual image 1115 and the plurality of second virtual images 1125 can be the same to correspond to a longer road section in the environment, further improving the navigation effect. The content of the first virtual image 1115 and the plurality of second virtual images 1125 can be different. For example, the content of the first virtual image 1115 includes information of the transport vehicle 1000 (oil volume, power, speed, etc.), and the second virtual image 1125 includes instruction signs (lane lines, indication arrows, etc.) to improve the driver's understanding of the transport vehicle 1000 and road conditions. In the fourth embodiment, a second light splitting unit 1120 farthest from the first light splitting unit 1110 may be provided with a total reflection film so that the second virtual image 1125 formed by the second light splitting unit 1120 has sufficient brightness so that the driver can recognize the content of each second virtual image 1125 .

[0054] See also Figure 4 In the fifth embodiment, the light splitting module 110 includes a first light splitting unit 1110 and a second light splitting unit 1120. The first optical film layer 1113 is a polarizing film, and the second optical film layer 1123 is also a polarizing film. Specifically, after the image source light beam is transmitted to the first optical film layer 1113, the first optical film layer 1113 transmits the light of the first polarization state in the image source light beam to form a first projection light beam 1114, and the first optical film layer 1113 reflects the light of the second polarization state in the image source light beam to change the optical path of the light of the second polarization state, and the reflected light of the second polarization state forms a first reflected light beam 1116, wherein the first polarization state and the second polarization state are different. The first reflected light beam 1116 can be transmitted to the second optical film layer 1123, and the second optical film layer 1123 can reflect the light of the second polarization state to form a second projection light beam 1124, and can also transmit the light of the first polarization state.

[0055] In the fifth embodiment, the polarizing films of the first spectroscopic unit 1110 and the second spectroscopic unit 1120 have different optical effects on the light of the first polarization state and the second polarization state, and can reduce the interference light in the first projection beam 1114 and the second projection beam 1124, so that the content of the first virtual image 1115 and the content of the second virtual image 1125 are clearer, and the virtual image formed by the interference light is prevented from overlapping with the first virtual image 1115 (and the second virtual image 1125), and the virtual image formed by the interference light is prevented from interfering with the driver's identification of the content of the first virtual image 1115. This embodiment can improve the flexibility of the composition of multiple virtual images in the optical system 10 by setting a polarizing film. The contents of the first virtual image 1115 and the second virtual image 1125 can be the same to correspond to longer road sections in the environment, further improving the navigation effect; the contents of the first virtual image 1115 and the second virtual image 1125 can be different. For example, the content of the first virtual image 1115 includes information about the transport vehicle 1000 (fuel level, power level, speed, etc.), and the second virtual image 1125 includes instruction signs (lane lines, indicator arrows, etc.) to improve the driver's understanding of the transport vehicle 1000 and road conditions.

[0056] In the absence of conflict, the features of each of embodiments one, two, three, four, and five regarding the number of second light splitting units 1120, the type of first optical film layer 1113, and the type of second optical film layer 1123 may be combined with other embodiments.

[0057] See also Figure 6In this embodiment, the optical system 10 further includes a beam folding module 130. The beam folding module 130 is disposed on the optical path of the image source beam. After the image source beam is transmitted to the beam folding module 130, the beam folding module 130 can reflect the image source beam to change the optical path of the image source beam. After the image source beam is folded by the beam folding module, the image source beam can be transmitted toward the beam expansion module 120. In this embodiment, the beam folding module 130 is provided, so that the optical path of the image source beam has more forms, and the distance between the image source module 20 and the beam expansion module 120 can be shortened, so that the optical system 10 occupies less space.

[0058] This embodiment does not limit the type of the beam folding module 130. As an example, the beam folding module 130 may include at least one plane reflector, which can reflect the image source beam and transmit the image source beam to the beam expansion module 120. As another example, the beam folding module 130 may include at least one curved reflector (such as a free-form surface reflector, a concave reflector, etc.). The curved reflector can reflect the image source beam on one hand, and correct the phase difference of the image source beam on the other hand, so that the virtual image formed by the image source beam projected on the windshield 800 is clearer and the deformation degree of the virtual image is reduced.

[0059] In this embodiment, with the windshield 800 as a reference object, the light splitting module 110 is arranged at intervals on the side of the windshield 800 where the projection imaging surface 810 is provided (i.e., the side facing the cockpit 910), wherein the first incident surface 1117 of the first light splitting unit 1110 of the light splitting module 110 is arranged on the side of the first light-transmitting body 1111 away from the windshield. The beam expansion module 120 is arranged on the side of the light splitting module 110 away from the windshield 800, and the beam expansion module 120 is arranged at intervals relative to the first incident surface 1117. The beam folding module 130 and the image source module 20 are arranged on the same side of the beam expansion module 120, and the beam folding module 130 is arranged between the image source module 20 and the windshield 800.

[0060] Under the setting of this embodiment, the shape of the optical path of the image source light beam is roughly determined. Specifically, the optical path of the image source light beam between the image source module 20 and the beam folding module 130 and the optical path of the image source light beam between the beam folding module 130 and the beam expansion module 120 form an angle with each other. The optical path of the image source light beam between the image source module 20 and the beam folding module 130 is roughly parallel to the optical path of the image source light beam between the beam expansion module 120 and the light splitting module 110. The optical path of the image source light beam between the beam expansion module 120 and the light splitting module 110 is roughly perpendicular to the optical path of the first reflected light beam 1116 (in this embodiment, the first light-transmitting body 1111 includes two isosceles right-angle prisms, the second light-transmitting body 1121 includes two isosceles right-angle prisms, and the image source light beam between the beam expansion module 120 and the light splitting module 110 is roughly perpendicular to the first incident surface 1117). Furthermore, the optical path of the image source beam between the beam expansion module 120 and the light splitting module 110, the optical path of the first projection beam 1114, and the optical path of the second projection beam 1124 are substantially parallel, and the optical path of the first projection beam 1114 and the optical path of the second projection beam 1124 are respectively substantially perpendicular to the optical path of the first reflected beam 1116. The position arrangement of each module of the optical system 10 in this embodiment makes the optical path layout of the image source beam relatively compact, so that the volume of the entire optical system 10 and the projection display device 100 is relatively small.

[0061] The present embodiment provides an optical system 10, wherein the light splitting module 110 in the optical system 10 includes at least a first light splitting unit 1110 and a second light splitting unit 1120, wherein the first light splitting unit 1110 and the second light splitting unit 1120 can cooperate to form two virtual images, and the imaging distances of the two virtual images are different. The contents of the two virtual images formed by the first light splitting unit 1110 and the second light splitting unit 1120 can be freely set, and the contents of the two virtual images can be set to be the same. In the process of real scene fusion, virtual images of the same content can be formed at both near and far positions, and the steps of simulating different distances by the background software algorithm of the transport vehicle 1000 can be omitted to avoid the software algorithm delay affecting the real scene fusion effect, thereby ensuring the real scene fusion effect, and enabling the indicating arrows or lane lines in the virtual image to correspond to longer sections in the environment, thereby improving the navigation effect. The contents of the two virtual images can also be set to be different, so as to provide the driver with more road information and information of the transport vehicle 1000 at the same time, so as to improve the driver's understanding of the transport vehicle 1000 and the road conditions.

[0062] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0063] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0064] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical system, It is characterized in that The optical system is applied to a projection display device having an image source module; the image source module is used to emit an image source light beam; The optical system comprises a beam splitter module and a beam expansion module, wherein the beam splitter module comprises a first beam splitter unit and a second beam splitter unit arranged in parallel; the beam expansion module is suitable for being arranged on the optical path of the image source light beam, and the image source light beam is reflected by the beam expansion module to the first beam splitter unit after being expanded by the beam expansion module; The first beam splitter is used to transmit part of the image source beam to form a first projection beam, and transmit the first projection beam to the target imaging carrier to form a first virtual image; the first beam splitter is also used to reflect part of the image source beam to form a first reflected beam, and transmit the first reflected beam to the second beam splitter; The second beam splitter is used to reflect at least a portion of the first reflected light beam to form a second projection light beam, and transmit the second projection light beam to the target imaging carrier to form a second virtual image. The imaging distances of the first virtual image and the second virtual image are different.

2. The optical system according to claim 1, It is characterized in that The first light splitting unit comprises a first light receiving surface, the first light receiving surface is provided with a first optical film layer, and the first optical film layer is used to reflect part of the image source light beam and transmit part of the image source light beam; The second light splitting unit includes a second light receiving surface, the first light receiving surface is provided with a second optical film layer, and the second optical film layer is used for reflecting at least a part of the first reflected light beam.

3. The optical system according to claim 2, It is characterized in that The first optical film layer is a semi-transparent and semi-reflective film; or / and, The first optical film layer is a polarizing film, which is used to transmit light in a first polarization state to form the first projection light beam, and to reflect light in a second polarization state to form the first reflected light beam, and the first polarization state and the second polarization state are different.

4. The optical system according to claim 3, It is characterized in that The second optical film layer is a semi-transparent and semi-reflective film, and the semi-transparent and semi-reflective film is also used to transmit part of the first reflected light beam; There are multiple second beam splitting units, and the multiple second beam splitting units are arranged in sequence along the optical path of the first reflected light beam on one side of the first beam splitting unit to receive the first reflected light beam in sequence; each second beam splitting unit is used to reflect light to form a corresponding second virtual image, and to transmit light to the next second beam splitting unit on the optical path of the first reflected light beam; the imaging distances of the multiple second virtual images formed by the multiple second beam splitting units are different.

5. The optical system according to claim 3, It is characterized in that The second optical film layer is a total reflection film.

6. The optical system according to claim 2, It is characterized in that The first optical film layer is a polarizing film, and the first optical film layer is used to transmit light of a first polarization state to form the first projection light beam, and to reflect light of a second polarization state to form the first reflected light beam, and the first polarization state and the second polarization state are different; The second optical film layer is a polarizing film, and the second optical film layer is used for reflecting the light of the second polarization state to form the second projection light beam.

7. An optical system according to any one of claims 2 to 6, It is characterized in that The range of the incident angle of the image source light beam on the first optical film layer is: greater than or equal to 30° and less than or equal to 60°; or / and, The range of the incident angle of the first reflected light beam on the second optical film layer is: greater than or equal to 30° and less than or equal to 60°.

8. An optical system according to any one of claims 2 to 6, It is characterized in that The first light splitting unit includes a first light-transmitting body, and the first light-receiving surface is defined inside the first light-transmitting body; The second light splitting unit includes a second light-transmitting body, the second light-receiving surface is defined inside the second light-transmitting body, and the second light-transmitting body is connected and arranged in parallel with the first light-transmitting body along the transmission direction of the first reflected light beam.

9. An optical system according to any one of claims 1 to 6, It is characterized in that The optical system also includes a beam folding module, which is arranged on the optical path of the image source light beam. After the image source light beam passes through the folding action of the beam folding module, the optical path of the image source light beam is folded so that the image source light beam is transmitted to the beam expansion module.

10. The optical system according to claim 9, It is characterized in that The beam folding module includes at least one of the following optical elements: a plane reflector and a curved reflector.

11. An optical system according to any one of claims 1 to 6, It is characterized in that The beam expansion module includes at least one of the following optical elements: a concave reflector and a convex reflector.

12. A projection display device, It is characterized in that include: An image source module, the image source module is used to emit an image source light beam; as well as The optical system according to any one of claims 1 to 11, wherein the optical system is located on the optical path of the image source light beam.

13. A transport vehicle, It is characterized in that include: Body; A windshield, the windshield being mounted on the machine body; as well as The projection display device as claimed in claim 12, wherein the projection display device is used to project onto the windshield to form the first virtual image and the second virtual image.

Images