Beam shaping assembly, head-up display device and traffic equipment

Abstract

The invention relates to a light beam shaping assembly, a head-up display device and traffic equipment, and relates to the technical field of optical instruments.The head-up display device comprises a light source output part, the light beam shaping assembly, a waveguide assembly and a modulation assembly, and by means of the light beam shaping assembly, all incident light can be shaped into a first polarized light beam in a single polarization direction; therefore, the decomposed first polarized light beam and the decomposed second polarized light beam can be all projected to the waveguide assembly, the light diffraction efficiency, the light modulation efficiency and the light utilization rate are improved, and the light energy loss is reduced; meanwhile, coupled-out light emitted by the waveguide assembly is projected to the adjusting assembly, the modulating assembly can change the direction and the polarization state of the coupled-out light to form imaging light, the imaging light is reflected to the observation area through the reflection imaging part, the conditions that the image light intensity of an image in the observation area is not enough and the image is distorted are avoided, and the light source is more stable under the same power condition. The image with higher brightness can be provided, and the safety and the user experience are improved.

Description

Technical Field

[0001] The present application relates to the technical field of optical instruments, and in particular to a beam shaping component, a head-up display device and traffic equipment. Background Art

[0002] Head Up Display (HUD) technology can utilize reflective optical design to project image light (including traffic equipment information such as vehicle speed) emitted by an image source onto an imaging window (such as a reflective imaging part, an imaging board, and other structures) so that the driver can directly see the information without having to look down at the dashboard during driving. This can not only improve driving safety, but also bring a better driving experience.

[0003] A head-up display device generally includes an optical machine, a reflective panel and a liquid crystal holographic film. The liquid crystal holographic film is arranged on the side of the reflective panel facing the optical machine, so that the light emitted from the optical machine is diffracted by the liquid crystal holographic film and converged to the eye box area. HUD has undergone three technological iterations. With the development of technology, the field of view angle and virtual image distance have been significantly improved.

[0004] However, in the above scheme, if the light emitted by the optical machine is S-state linear polarized light and P-state linear polarized light, for example, an LCOS optical machine or a DLP optical machine is used, due to the different polarization directions of the S light and the P light, the diffraction waveguide may not be able to diffract all the light in different directions. In this case, the utilization rate of the light in different directions by the diffraction waveguide is not high, resulting in some loss of light energy. In addition, outcoupled light is emitted on both sides of the outcoupling end of the diffraction waveguide. If the outcoupled light on both sides cannot be completely converged to the eye box area, the image in the eye box area may have insufficient light intensity and image distortion, thereby reducing security and providing a poor user experience. Summary of the invention

[0005] Based on this, it is necessary to provide a beam shaping component, a head-up display device and traffic equipment to address the above technical problems.

[0006] A first aspect of the present invention provides a beam shaping component, which includes a polarization beam splitter, a shaping component and a first direction changing component, wherein the polarization beam splitter is arranged in an output light path of a light source output component, and is used to receive an incident light output from the light source output component, and decompose the incident light into a first polarization beam and a second polarization beam whose polarization states are orthogonal to each other and output them respectively; the shaping component is arranged on one side of the polarization beam splitter, and is used to receive a second polarization beam output from the polarization beam splitter, and change the polarization state of the second polarization beam; the first direction changing component is arranged on a side of the shaping component facing away from the polarization beam splitter, and is used to receive the second polarization beam output from the shaping component and change the direction of the second polarization beam; wherein the second polarization beam whose direction and polarization state have been changed can be transmitted through the shaping component, and the shaping component shapes the second polarization beam into a first polarization beam.

[0007] In one embodiment, the beam shaping component further comprises a second direction changing element arranged on the polarization beam splitter and facing away from the shaping element, the second direction changing element can receive the first polarized light output from the shaping element and reflect the first polarized light beam and emit it in a direction parallel to the output light path.

[0008] In one embodiment, the first polarized light beam is P light, the second polarized light beam is S light, the shaping element is capable of converting the second polarized light beam into a first left-handed circularly polarized light, the first direction changing element is capable of converting the first left-handed circularly polarized light into a first right-handed circularly polarized light and reflecting the first right-handed circularly polarized light to the shaping element, and the shaping element is capable of converting the first right-handed circularly polarized light into the first polarized light beam.

[0009] In one embodiment, the central axes of the first direction changing element, the polarization splitting element, the shaping element and the second direction changing element are all located on the same straight line, the reflecting surface of the first direction changing element is arranged parallel to the outgoing light path, so that the second polarized light beam output from the shaping element is reflected to the second direction changing element perpendicular to the outgoing light path, and the reflecting surface of the second direction changing element forms a preset angle with respect to the outgoing light path, so that the first polarized light beam output from the shaping element is reflected by the second direction changing element and then emitted in a direction parallel to the outgoing light path.

[0010] A second aspect of the present invention provides a head-up display device, which includes a beam shaping component, a waveguide component and a modulation component. The beam shaping component is arranged on one side of a light source output component, and is used to receive an incident light emitted by the light source output component, and decompose the incident light into a first polarized light beam and a second polarized light beam whose polarization states are orthogonal to each other. The beam shaping component can shape the second polarized light beam into a first polarized light beam; the waveguide component is used to receive the first polarized light beam emitted from the beam shaping component, and couple the first polarized light beam to output outcoupled light after passing through the waveguide component; the modulation component is arranged on the side of the waveguide component, and is used to receive the outcoupled light beam, and is able to change the direction and polarization state of the outcoupled light beam, so that the outcoupled light beam can be reflected to form imaging light beam incident on an observation area.

[0011] In one embodiment, the beam shaping component includes a polarization beam splitter, a shaping element and a first direction changing element which are sequentially arranged at intervals on one side of a light source output element; the polarization beam splitter is arranged on an output light path of the light source output element, and is used to receive an incident light output from the light source output element, and decompose the incident light into a first polarization light beam and a second polarization light beam whose polarization states are orthogonal to each other and output them respectively; the shaping element is arranged on one side of the polarization beam splitter, and is used to receive a second polarization light beam output from the polarization beam splitter, and change the polarization state of the second polarization light beam; the first direction changing element is arranged on a side of the shaping element facing away from the polarization beam splitter, and is used to receive the second polarization light beam output from the shaping element and change the direction of the second polarization light beam; wherein the second polarization light beam whose direction and state have been changed can be transmitted through the shaping element, and the shaping element shapes the second polarization light beam into the first polarization light beam.

[0012] In one embodiment, the modulation component includes a first polarizer arranged on one side of the waveguide component, a second polarizer arranged on the other side of the waveguide component, and a reflector arranged on the side of the second polarizer facing away from the waveguide component, and the central axes of the first polarizer, the second polarizer and the reflector are all located on the same straight line; outcoupled light is emitted from both sides of the waveguide component; the outcoupled light facing the side of the first polarizer can be directly projected to the first polarizer, and after reflection, pass through the waveguide component and be projected to the second polarizer, and the outcoupled light facing the side of the second polarizer is directly projected to the second polarizer, the second polarizer can transmit all the outcoupled light and change the polarization state of the outcoupled light, the reflector can change the direction of the outcoupled light output from the second polarizer, so that the outcoupled light is transmitted through the second polarizer again, and the second polarizer changes the polarization state of the outcoupled light again, and converts the outcoupled light into imaging light.

[0013] In one embodiment, the first polarized light beam is P light incident on the waveguide component, and the imaging light is S light incident on the observation area. The P light is converted into second left-handed circularly polarized light by passing through the second polarizer, and the second left-handed circularly polarized light is converted into second right-handed circularly polarized light by passing through the reflector, and the second right-handed circularly polarized light is converted into S-state linear polarized light by passing through the second polarizer again.

[0014] In one embodiment, the waveguide component includes a diffraction waveguide, a coupling-in region and a coupling-in region arranged in the output light path, the coupling-in region and the coupling-out region are located on the same side of the diffraction waveguide; the coupling-in region is used to couple and transmit a first polarized light beam, and project the first polarized light beam to the diffraction waveguide at a preset tilt angle, the diffraction waveguide is used to perform pupil expansion transmission of the first polarized light beam, and the coupling-out region can output coupling-out light respectively on the side relative to the first polarizer and the second polarizer.

[0015] A third aspect of the present invention provides a traffic device, which includes the above-mentioned head-up display device, and the head-up display device also includes a reflective imaging unit, which can reflect imaging light output from the reflector to an observation area.

[0016] The technical effect of the present invention is as follows: by using the beam shaping component, the incident light can be completely shaped into a first polarized light beam with a single polarization direction, thereby ensuring that the decomposed first polarized light beam and the second polarized light beam can be completely projected to the waveguide component, thereby improving the light diffraction efficiency, light modulation efficiency and light utilization rate, and reducing light energy loss; at the same time, the outcoupled light emitted by the waveguide component is projected to the adjustment component, and the modulation component can change the direction and polarization state of the outcoupled light to form an imaging light. The imaging light is reflected by the reflective imaging part to the observation area, avoiding the situation where the image in the observation area has insufficient image intensity and image distortion. Under the same power conditions, the light source can provide an image with higher brightness, thereby improving safety and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a beam shaping assembly, a head-up display device and a traffic device in one embodiment.

[0018] Figure 2 Schematic diagram of the structure of a beam shaping component and a light source output component in one embodiment.

[0019] Figure 3 Schematic diagram of the structure of a waveguide component and a projection lens group in one embodiment.

[0020] Figure 4 for Figure 1 Schematic diagram of the structure in which the beam shaping component and the light source output component are removed.

[0021] Description of the accompanying drawings: 100, traffic equipment; 11, light source output element; 111, incident light; 1111, first polarized light beam; 1112, second polarized light beam; 1112-L, first polarized left-handed polarized light; 1112-R, first polarized right-handed polarized light; 12, beam shaping component; 121, first direction changing element; 122, shaping element; 123, polarization splitter; 124, second direction changing element; 13, waveguide component; 131, outcoupling light; 132, diffraction waveguide; 133, outcoupling area; 134, incoupling area; 14, modulation component; 141, first polarizer; 142, second polarizer; 143, reflecting element; 15, observation area; 151, imaging light; 16, reflective imaging unit. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0024] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two units or the interaction relationship between two units, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] It should be noted that if a unit is referred to as being "fixed to" or "disposed on" another unit, it may be directly on the other unit or there may be a central unit. If a unit is considered to be "connected to" another unit, it may be directly connected to the other unit or there may be a central unit at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0028] Before introducing the specific scheme of the embodiment of the present application, the relevant contents of the head-up display device are briefly introduced. In the field of optical instrument technology, the head-up display device is an important unit. The head-up display (HUD) technology can use reflective optical design to project the image light (including traffic equipment information such as vehicle speed) emitted by the image source onto the imaging window (such as reflective imaging part, imaging board and other structures), so that the driver can directly see the information without looking down at the dashboard during driving. In the existing head-up display device design, the light emitted by the optical machine can be diffracted by the waveguide and then converged to the eye box for the user to observe. If the light emitted by the optical machine is S light and P light, for example, an LCOS optical machine or a DLP optical machine is used, due to the different polarization directions of the S light and the P light, the diffraction waveguide may not be able to completely diffract the light in different directions. In this case, the utilization rate of the light in different directions by the diffraction waveguide is not high, resulting in some loss of light energy. In addition, outcoupled light is emitted on both sides of the outcoupling end of the diffraction waveguide. If the outcoupled light on both sides cannot be completely converged to the eye box area, the image in the eye box area may have insufficient image light intensity and image distortion, thereby reducing safety and providing a poor user experience.

[0029] See also Figure 1 , Figure 1A schematic diagram of a beam shaping component, a head-up display device, and a traffic device in an embodiment of the present application is shown, wherein the traffic device includes a head-up display device 100, and the head-up display device 100 includes a light source output component 11, a beam shaping component 12, a waveguide component 13, and a modulation component 14. An incident light 111 output by the light source output component 11 is shaped and decomposed into a first polarized light beam 1111 and a second polarized light beam 1112 by the beam shaping component 12, and the beam shaping component 12 can shape the second polarized light beam 1112 into a first polarized light beam 1111. By using the beam shaping component 12, the incident light 111 can be completely shaped into a first polarized light beam 111 with a single polarization direction. 1, thereby ensuring that the decomposed first polarized light beam 1111 and the second polarized light beam 1112 can all be projected to the waveguide component 13, thereby improving the light diffraction efficiency, light modulation efficiency and light utilization efficiency, and reducing light energy loss; at the same time, the outcoupled light 131 emitted by the waveguide component 13 is projected to the adjustment component 14, and the modulation component 14 can change the direction and polarization state of the outcoupled light 131 to form an imaging light 151, and the imaging light 151 is reflected by the reflective imaging part 16 to the observation area 15, so as to avoid the image in the observation area 15 from having insufficient image light intensity and image distortion. Under the same power condition, the light source can provide an image with higher brightness, thereby improving safety and user experience.

[0030] The light source output element 11 includes at least one electroluminescent device, which can generate light along an outgoing light path through electric field excitation. Figure 1In the direction of the incident light 111 projected onto the beam shaping component, an electroluminescent device such as a light emitting diode (LED), an organic light-emitting diode (OLED), a mini light-emitting diode (Mini LED), a micro light-emitting diode (Micro LED), a cold cathode fluorescent lamp (CCFL), a cold LED light source (Cold LED Light, CLL), an electroluminescent (EL), an electron emission (Field EmiSSion DiSPlay, FED) or a quantum dot light source (Quantum Dot, QD), etc. The incident light 111 output by the light source output element 11 of the present embodiment includes S light and P light. For example, the light source output element 11 adopts an LCOS optical machine or a DLP optical machine. If the incident light 111 is directly projected to the waveguide component 13 for diffraction, due to the different polarization directions of the S light and the P light, the waveguide component 13 may not be able to completely diffract the light in different directions. Then, the utilization rate of the light in different directions by the waveguide component 13 is not high. In the present embodiment, the incident light 111 is shaped by the beam shaping component 12 to shape the incident light 111 into a single first polarized light beam 1111, thereby improving the light utilization rate. The specific structure of the beam shaping component 12 will be described below.

[0031] like Figure 1-2 As shown, the beam shaping component 12 includes a first direction-changing component 121, a shaping component 122, a polarization beam splitter 123 and a second direction-changing component 124. The first direction-changing component 121, the shaping component 122, the polarization beam splitter 123 and the second direction-changing component 124 are sequentially arranged on one side of the light source output component 11, wherein the polarization beam splitter 123 is correspondingly arranged on the output light path of the light source output component 11, and the incident light 111 is emitted along the output light path. For this embodiment, the shaping component 122 can be a phase delay film, such as a quarter-wave plate, one of the functions of the quarter-wave plate is to change linear polarized light into circular polarized light or elliptically polarized light, or vice versa; the polarization beam splitter 123 can be a polarization beam splitter lens; the first direction-changing component 121 and the second direction-changing component 124 can be a structure formed by stacking organic films or inorganic films.

[0032] like Figure 2As shown, the polarization beam splitter 123 can receive the incident light 111 output from the light source output element 11, and the polarization beam splitter 123 can decompose the incident light 111 into a first polarized light beam 1111 and a second polarized light beam 1112, namely, P-state linear polarized light and S-state linear polarized light, referred to as P light and S light, the vibration directions of the two are perpendicular to each other, the first polarized light beam 1111 disclosed in this embodiment is P light, and the second polarized light beam 1112 is S light, and the second polarized light beam 1112 can be directly projected to the shaping element 122, and the shaping element 122 can be used to receive the second polarized light beam 1112 emitted from the polarization beam splitter 123, and change the polarization state of the second polarized light beam 1112, that is, the second polarized light beam 1112 can be converted into a first left-handed circularly polarized light 1112-L; the first direction changing element 121 can receive the first left-handed circularly polarized light 1112-L output from the shaping element 122 and change the first left-handed circularly polarized light 1112-L The first left-handed circularly polarized light 1112-L is converted into the first right-handed circularly polarized light 1112-R, and the first right-handed circularly polarized light 1112-R is reflected to the shaping member 122, the shaping member 122 is capable of converting the first right-handed circularly polarized light 1112-R into the first polarized light beam 1111, the second direction changing member 124 is capable of receiving the first polarized light beam 1111 outputted from the shaping member 122, and makes the first polarized light beam 1111 reflected and emitted to the projection lens group 112 in a direction parallel to the exiting light path, and at the same time the projection lens group 112 is capable of receiving the first polarized light beam 1111 emitted from the polarization splitter 123, the projection lens group 112 is capable of projecting all the first polarized light beams 1111 to the waveguide component 13, thereby avoiding the situation that the second polarized light beam 1112 cannot be projected to the waveguide component 13, improving the light diffraction efficiency, light modulation efficiency and light utilization rate, and reducing the light energy loss.

[0033] In other embodiments, the beam shaping component 12 may not include the second direction changing element 124, and the projection lens group 112 may be arranged on the transmission path of the first polarized light beam 1112 emitted from the shaping element 122, so that the first polarized light beam 1111 emitted from the shaping element 122 can directly reach the projection lens group 112.

[0034] Furthermore, the reflection surface of the first direction-changing member 121 is arranged parallel to the outgoing light path, so that the second polarized light beam 1112 is reflected perpendicularly to the outgoing light path to the second direction-changing member 124, and the reflection surface of the second direction-changing member 124 is at a preset angle relative to the outgoing light path, and the preset angle in this embodiment can be 45 degrees, so that the first polarized light beam 1111 output from the shaping member 122 is emitted along the outgoing light path after being reflected by the second direction-changing member 124. In this way, the straight-line propagation of the light is ensured, the time for the second polarized light beam 1112 to pass through the beam shaping component 12 is shortened, the shaping time is shortened, and the shaping efficiency is improved.

[0035] In other embodiments, the directions of the first direction changing member 121 and the second direction changing member 124 may not be limited, as long as the functions of the first direction changing member 121 and the second direction changing member 124 described above are met. In addition, the material, shape, model and other properties of the first direction changing member 121 and the second direction changing member 124 may not be limited.

[0036] In other embodiments, in different scenarios, the first polarized light beam 1111 projected onto the waveguide component 13 may be S light, and the second polarized light beam 1112 may be P light. The beam shaping component 12 may also be able to realize the conversion between P light and S light, and may output light with a single polarization direction.

[0037] like Figure 3 As shown, the waveguide component 13 is arranged on one side of the projection lens group 112, and the waveguide component 13 includes a diffraction waveguide 132, a coupling-out region 133 and a coupling-in region 134, wherein the coupling-out region 133 and the coupling-in region 134 are located on the same side of the diffraction waveguide 132, and the coupling-in region 134 can receive a first polarized light beam 1111 emitted from the projection lens group 112, and the first polarized light beam 1111 is projected onto the diffraction waveguide 132 at a preset tilt angle relative to the output light path, and the tilt angle can be 45 degrees, 60 degrees or other tilt angles. After the first polarized light beam 1111 undergoes multiple total reflections in the diffraction waveguide 132, the upper and lower sides of the coupling-out region 133 both emit coupling-out light 131, and the polarization states of the coupling-out light beams 131 on the upper and lower sides are the same as the polarization state of the first polarized light beam 1111 of the coupling-in region 143, that is, both are P light.

[0038] In other embodiments, the out-coupling region 133 and the in-coupling region 134 may not be on the same side of the diffraction waveguide 132, and the first polarized light beam 1111 may not be projected at a preset tilt angle. For example, the first polarized light beam 1111 may propagate along the outgoing light path. In addition, the shape, size, material and other properties of the diffraction waveguide 132, the out-coupling region 133 and the in-coupling region 134 are not limited as long as the diffraction function of the waveguide component 13 can be realized.

[0039] like Figure 4As shown, the modulation component 14 includes a first polarizer 141, a second polarizer 142 and a reflector 143. One side of the waveguide component 13 corresponds to the first polarizer 141, and the other side corresponds to the second polarizer 142. The reflector 143 is arranged on the side of the second polarizer 142 facing away from the waveguide component 13. The first polarizer 141 can be a polarization structure that has the function of reflecting the out-coupled light 131 and transmitting the imaging light 151, such as a polarizer. It can also be a device that realizes polarization by using a PBS prism, a metal wire grid, etc. The second polarizer 142 can be a phase delay film, such as a quarter wave plate. Preferably, the central axes of the first polarizer 141, the second polarizer 142 and the reflector 143 are all located in the same straight line to ensure the straight-line propagation of the light and shorten the time for the out-coupled light 131 to pass through the modulation component 14.

[0040] The outcoupled light 131 facing the first polarizer 141 can be directly projected onto the first polarizer 141. The outcoupled light 131 passes through the waveguide component 13 after reflection, is projected onto the second polarizer 142 and irradiated onto the reflector 143. The second polarizer 142 can change the polarization state of the outcoupled light 131, that is, the second polarizer 142 can change the P light into the second left-handed circularly polarized light 131-L, and the reflector can change the direction of the second left-handed circularly polarized light 131-L, that is, the reflector 143 can change the second left-handed circularly polarized light 131 -L becomes the second right-handed circularly polarized light 131-R, the reflector 143 reflects the second right-handed circularly polarized light 131-R, so that the second right-handed circularly polarized light 131-R passes through the second polarizer 142, the waveguide component 13 and the first polarizer 141 in sequence, and the second polarizer 142 changes the polarization state of the second right-handed circularly polarized light 131-R again, that is, the second polarizer 142 can change the second right-handed circularly polarized light 131-R into S light, and finally the S light is irradiated to the reflective imaging part 16, and is reflected to the observation area 15 through the reflective imaging part 16. The outcoupled light 131 on the side facing the second polarizer 142 is directly projected onto the second polarizer 142. The second polarizer 142 can transmit all the outcoupled light 131 and change the polarization state of the outcoupled light 131, that is, the second polarizer 142 can change the P light into a second left-handed circularly polarized light 131-L. The reflector 143 can change the direction of the outcoupled light 131 output from the second polarizer 142, that is, the reflector 143 can change the second left-handed circularly polarized light 131-L into a second right-handed circularly polarized light 131-R, so that the outcoupled light 131 is transmitted through the second polarizer 142 again. The second polarizer 142 changes the polarization state of the outcoupled light 131 again, that is, the second polarizer 142 can change the second right-handed circularly polarized light 131-R into S light. At the same time, the reflective imaging unit 16 reflects the S light to the observation area 15. The modulation component 14 can modulate the outcoupled light 131 on the upper and lower sides of the waveguide component 13, so that all the coupled light 131 is converted into imaging light 151 incident on the observation area 15, and the light utilization rate is high.

[0041] In other embodiments, the first polarized light beam 1111 irradiated to the waveguide component 13 may be S light, and the light incident on the observation area may be P light. For example, in a laser module, it is usually necessary that P light be incident on the observation area 15, and the observation area 15 is a laser module. In this case, the S light needs to be modulated into P light via the modulation component 14, which is in line with the laser application scenario.

[0042] In other embodiments, the outcoupled light 131 may be coupled out from only one side of the diffraction waveguide 132, as long as the outcoupled light 131 coupled out of the diffraction waveguide 132 is modulated by the modulation component 14 and the output light meets the requirements of the specific application scenario.

[0043] The traffic device 100 further includes a head-up display (not shown) provided by at least one embodiment of the present disclosure, and a front window (eg, front windshield) of the traffic device 100 is multiplexed as a reflective imaging portion 16 of the head-up display.

[0044] The reflective imaging unit 16 is configured to reflect the imaging light 151 output from the modulation component 14 to the observation area 15, and the user in the observation area 15 can observe the image formed by the imaging light 151 reflected by the reflective imaging unit 16. The above-mentioned reflective imaging unit 16 can be a windshield or an imaging window of a motor vehicle, corresponding to a windshield head-up display (W-HUD) and a combined head-up display, respectively. The above-mentioned observation area can be an eyebox area, which refers to a planar area where the user's eyes are located and the head-up display displays the image formed by the imaging light 151. For example, when the user's eyes deviate from the center of the eyebox area by a certain distance, such as moving up and down or left and right by a certain distance, as long as the user's eyes are still in the eyebox area, the user can still see the image formed by the imaging light displayed by the head-up display.

[0045] The transportation device 100 can be any suitable means of transportation, for example, it can include various types of land transportation equipment such as cars, or it can be water transportation equipment such as ships, as long as a front window is set at the driving position and the image is projected onto the front window through the vehicle-mounted display system.

[0046] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A beam shaping component, It is characterized in that The beam shaping assembly comprises: A polarization beam splitter, arranged in the output light path of the light source output element, for receiving the incident light output from the light source output element, and splitting the incident light into a first polarization beam and a second polarization beam with mutually orthogonal polarization states and outputting them respectively; a shaping element, disposed on one side of the polarization beam splitter, for receiving a second polarized light beam output from the polarization beam splitter and changing a polarization state of the second polarized light beam; and A first direction-changing element, disposed on a side of the shaping element facing away from the polarization beam splitting element, for receiving a second polarized light beam output from the shaping element and changing a direction of the second polarized light beam; The second polarized light beam with changed direction and polarization state can be transmitted through the shaping element, and the shaping element shapes the second polarized light beam into the first polarized light beam.

2. The beam shaping assembly according to claim 1, It is characterized in that The beam shaping component further comprises a second direction changing element arranged on a side of the polarization beam splitter facing away from the shaping element, the second direction changing element being capable of receiving the first polarized light outputted from the shaping element and causing the first polarized light beam to be reflected and emitted in a direction parallel to the output light path.

3. The beam shaping assembly according to claim 2, It is characterized in that The first polarized light beam is P light, the second polarized light beam is S light, the shaping element can convert the second polarized light beam into a first left-handed circularly polarized light, the first direction changing element can convert the first left-handed circularly polarized light into a first right-handed circularly polarized light and reflect the first right-handed circularly polarized light to the shaping element, and the shaping element can convert the first right-handed circularly polarized light into the first polarized light beam.

4. The beam shaping assembly according to claim 2, It is characterized in that The central axes of the first direction-changing element, the polarization splitter element, the shaping element and the second direction-changing element are all located on the same straight line. The reflecting surface of the first direction-changing element is arranged parallel to the outgoing light path so that the second polarized light beam output from the shaping element is reflected to the second direction-changing element perpendicular to the outgoing light path. The reflecting surface of the second direction-changing element forms a preset angle with respect to the outgoing light path so that the first polarized light beam output from the shaping element is reflected by the second direction-changing element and then emitted in a direction parallel to the outgoing light path.

5. A head-up display device, It is characterized in that The head-up display device comprises: A beam shaping component is disposed on one side of the light source output element, and is used to receive the incident light emitted by the light source output element, and decompose the incident light into a first polarized light beam and a second polarized light beam whose polarization states are orthogonal to each other, and the beam shaping component can shape the second polarized light beam into a first polarized light beam; a waveguide component, used for receiving all first polarized light beams emitted from the beam shaping component, and making the first polarized light beam output outcoupling light after passing through the waveguide component; and The modulation component is arranged on the side of the waveguide component, and is used to receive the outcoupled light and can change the polarization state and direction of the outcoupled light so that the outcoupled light can be reflected to form imaging light incident on the observation area.

6. The head-up display device according to claim 5, It is characterized in that The beam shaping component comprises a polarization beam splitter, a shaping element and a first direction changing element which are sequentially arranged at intervals on one side of the light source output element; The polarization beam splitter is arranged on the output light path of the light source output element, and is used to receive the incident light output from the light source output element, and decompose the incident light into a first polarization light beam and a second polarization light beam whose polarization states are orthogonal to each other and output them respectively; the shaping element is arranged on one side of the polarization beam splitter, and is used to receive the second polarization light beam output from the polarization beam splitter, and change the polarization state of the second polarization light beam; The first direction-changing element is arranged on a side of the shaping element facing away from the polarization splitting element, and is used to receive a second polarized light beam output from the shaping element and change the direction of the second polarized light beam; wherein the second polarized light beam with changed direction and polarization state can be transmitted through the shaping element, and the shaping element shapes the second polarized light beam into a first polarized light beam.

7. The head-up display device according to claim 5, It is characterized in that The modulation component comprises a first polarizer disposed on one side of the waveguide component, a second polarizer disposed on the other side of the waveguide component, and a reflector disposed on the side of the second polarizer facing away from the waveguide component, wherein the central axes of the first polarizer, the second polarizer and the reflector are all located on the same straight line; Outcoupled light is emitted from both sides of the waveguide component. The outcoupled light facing the first polarizer can be directly projected onto the first polarizer, and after reflection, passes through the waveguide component and is projected onto the second polarizer; the outcoupled light facing the second polarizer is directly projected onto the second polarizer, and the second polarizer can transmit all of the outcoupled light and change the polarization state of the outcoupled light. The reflector can change the direction of the outcoupled light output from the second polarizer, so that the outcoupled light is transmitted through the second polarizer again, and the second polarizer changes the polarization state of the outcoupled light again, converting the outcoupled light into the imaging light.

8. The head-up display device according to claim 7, It is characterized in that The first polarized light beam is P light incident on the waveguide component, and the imaging light is S light incident on the observation area. The P light is converted into second left-handed circularly polarized light through the second polarizer, and the second left-handed circularly polarized light is converted into second right-handed circularly polarized light through the reflector, and the second right-handed circularly polarized light is converted into S light again through the second polarizer.

9. The head-up display device according to any one of claims 5 to 8, It is characterized in that The waveguide assembly comprises a diffractive waveguide, an outcoupling region and an incoupling region arranged in the outgoing light path, wherein the incoupling region and the outcoupling region are located on the same side of the diffractive waveguide; The coupling-in region is used to couple in and transmit the first polarized light beam, and project the first polarized light beam to the diffraction waveguide at a preset tilt angle. The diffraction waveguide is used to perform pupil expansion transmission on the first polarized light beam. The coupling-out region can output the coupling-out light respectively on the side relative to the first polarizer and the second polarizer.

10. A transportation device, It is characterized in that The traffic equipment includes the head-up display device according to any one of claims 5 to 9, and the head-up display device also includes a reflective imaging unit, which can reflect the imaging light output from the reflector to the observation area.

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