Head-up display device, head-up display method, and vehicle

Abstract

A head-up display device, a head-up display method, and a vehicle are provided. The head-up display device includes a picture generation unit PGU (300) and a light assembly (400). The PGU (300) generates a light beam to be projected onto a first area picture and a light beam to be projected onto a second area picture. Different projection areas of the light assembly (400) correspond to different focusing powers, and thus the virtual images of the first area picture and the second area picture reflected or transmitted by the light assembly (400) are focused at different positions. This helps simplify the assembly volume of the head-up display device, resulting in low complexity.

Description

[Technical field]

[0001] The present application relates to the field of intelligent vehicle technology, and in particular to the field of a head-up display device, a head-up display method, and a vehicle. [Background technology]

[0002] Head-up display (HUD) technology, also called heads-up display technology, has been gradually and extensively applied in the field of automobiles in recent years. HUD devices project important driving information onto the windshield, which is then reflected by the windshield to form a virtual image directly in the driver's line of sight, allowing the driver to view the information without looking down at the dashboard or control screen. Compared with dashboards, central control screens, or other display methods that require the driver to look down, HUD avoids the risk of distracted driving caused by lowering the driver's line of sight, making it a safer in-vehicle display method.

[0003] Currently, to achieve a larger display area to display meter information, such as vehicle speed, fuel level, and water temperature, HUD devices show the information in close-up (about 2-3 meters away) and blend navigation information with reality to display it at a distance of 7.5-10 meters. HUD devices rely on multiple picture generation units (PGUs) to achieve the above objectives, despite the high cost and large volume required. Summary of the Invention

[0004] The embodiments of the present application provide a head-up display device, a head-up display method, and a vehicle that are implemented by using only one PGU, and thus the cost and volume of the HUD device can be reduced.

[0005] According to a first aspect, an embodiment of the present application provides a picture generation unit 、 PGU 、 and a light assembly. The PGU is configured to generate a light beam to be projected onto a picture, the picture to be projected including a first area picture and a second area picture, emit a light beam for the first area picture such that the light beam for the first area picture passes through a first projection area of ​​the light assembly, and emit a light beam for the second area picture such that the light beam for the second area picture passes through a second projection area of ​​the light assembly. A focal power of a portion of the light assembly through which an optical path of the light beam for the first area picture passes is different from a focal power of a portion of the light assembly through which an optical path of the light beam for the second area picture passes.

[0006] It can be understood that the focal power of the portion of the light assembly through which the optical path of the light beam for the first area picture passes is different from the focal power of the portion of the light assembly through which the optical path of the light beam for the second area picture passes, such that the light assembly can be divided into two portions, where the first portion corresponds to the first projection area and the second portion corresponds to the second projection area, and the focal power of the first portion is different from the focal power of the second portion.

[0007] Through the above HUD device, the first area picture and the second area picture are projected to different projection areas of the light assembly by using one PGU. Because the parts of different projection areas of the light assembly have different focusing powers, the different area pictures output from the HUD device can be focused to different depths, i.e., displayed as two virtual images with different virtual image distances. The HUD device only needs to use a single PGU, and does not need to increase the length of the light path of the area picture. Therefore, no reflection assembly is needed anymore. This helps simplify the assembly volume of the HUD device, and the complexity is low.

[0008] In a possible design, the apparatus further includes a ghost elimination assembly configured to adjust a light beam for the first area picture and / or a light beam for the second area picture input to the ghost elimination assembly such that a light beam for the first area picture and emitted through a first projection area of ​​the light assembly does not overlap a light beam for the second area picture and emitted through a second projection area of ​​the light assembly.

[0009] In the above design, the light beams are adjusted by using a ghost removal assembly so that the light beams of the two area pictures do not overlap when arriving at the human eye, and no interference occurs after the virtual image corresponding to the first area picture and the virtual image corresponding to the second area picture are focused. This avoids the case where a part of the picture on the long focal surface is present in the picture on the short focal surface seen by the human eye, and a part of the picture of the short focal surface is present in the picture of the long focal surface.

[0010] In a possible design, the ghost removal assembly includes a first optical wedge and / or a second optical wedge. The first optical wedge is located between the PGU and the optical path of the first projection area, is for the first area picture, and is configured to adjust the emission direction of the light beam input to the first optical wedge, or the second optical wedge is located between the PGU and the optical path of the second projection area, is for the second area picture, and is configured to adjust the emission direction of the light beam input to the second optical wedge. It can be understood that the propagation direction of the light beam for the first area picture projected by the PGU to the first optical wedge is adjusted by using the first optical wedge and / or the propagation direction of the light beam for the second area picture projected by the PGU to the second optical wedge is adjusted by using the second optical wedge, so that the light beam for the first area picture and the light beam for the second area picture do not overlap when arriving at the optical assembly.

[0011] In a possible design, the ghost elimination assembly includes at least a first half-wave plate, a first film layer, and a second film layer, where the first film layer is attached to a first projection area of ​​the light assembly and the second film layer is attached to a second projection area of ​​the light assembly.

[0012] Case 1: At least one first half-wave plate is located between the PGU and the light path of the first projection area, and the polarization direction of the light beam for the first area picture adjusted by the at least one first half-wave plate is perpendicular to the polarization direction of the light beam for the second area picture projected by the PGU. The polarization direction of the first film layer is perpendicular to the polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer. The polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the at least one half-wave plate, and the polarization direction of the second film layer is perpendicular to the polarization direction of the light beam for the first area picture projected by the at least one half-wave plate. In this way, the light beam for the first area picture is absorbed by the second film layer when it arrives at the second film layer. On the contrary, the light beam for the second area picture is absorbed by the first film layer when it arrives at the first film layer, i.e., it can be understood that the light beam for the first area picture projected through the first projection area of ​​the light assembly and the light beam for the second area picture projected through the second projection area do not interfere with each other.

[0013] Case 2: At least one first half-wave plate is located between the PGU and the optical path of the second projection area, and the polarization direction of the light beam for the second area picture adjusted by the at least one half-wave plate is perpendicular to the polarization direction of the light beam for the first area picture projected by the PGU. The polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer. The polarization direction of the second film layer is the same as the polarization direction of the light beam for the second area picture projected by the at least one half-wave plate, and the polarization direction of the first film layer is perpendicular to the polarization direction of the light beam for the second area picture projected by the at least one half-wave plate. In this way, the light beam for the first area picture is absorbed by the second film layer when it arrives at the second film layer. On the other hand, the light beam for the second area picture is absorbed by the first film layer when it arrives at the first film layer, i.e., it can be understood that the light beam for the first area picture projected through the first projection area of ​​the light assembly and the light beam for the second area picture projected through the second projection area do not interfere with each other.

[0014] In a possible design, the PGU includes a projector light engine and a diffuser, the projector light engine configured to generate a light beam to be projected onto a picture, the diffuser including a third projection area and a fourth projection area, the diffuser configured to uniformly project onto a first projection area of ​​the light assembly a light beam for the first area picture and received in the third projection area, and to uniformly project onto a second projection area of ​​the light assembly a light beam for the second area picture and received in the fourth projection area.

[0015] In a possible design, the ghost cancellation assembly is disposed in the PGU, and the ghost cancellation assembly includes a third optical wedge and / or a fourth optical wedge, the third optical wedge being located between the projector light engine and the optical path of the third projection area, for a first area picture, and configured to adjust an emission direction of a light beam input to the third optical wedge, or the fourth optical wedge being located between the projector light engine and the optical path of the fourth projection area, for a second area picture, and configured to adjust an emission direction of a light beam input to the fourth optical wedge. It can be understood that the propagation direction of the light beam for the first area picture projected by the projector light engine onto the third optical wedge is adjusted by using a third optical wedge, and / or the propagation direction of the light beam for the second area picture projected by the projector light engine onto the fourth optical wedge is adjusted by using a fourth optical wedge, so that the light beam for the first area picture and the light beam for the second area picture do not overlap when arriving at the light assembly.

[0016] In a possible design, the ghost elimination assembly includes at least a second half-wave plate, a third film layer, and a fourth film layer, where the first film layer is attached to a first projection area of ​​the light assembly and the second film layer is attached to a second projection area of ​​the light assembly.

[0017] Case 1: At least one second half-wave plate is located between the projector light engine and the light path of the third projection area, and the polarization direction of the light beam for the first area picture adjusted by the at least one second half-wave plate is perpendicular to the polarization direction of the light beam for the second area picture projected by the projector light engine. The polarization direction of the first film layer is perpendicular to the polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer. The polarization direction of the second film layer is the same as the polarization direction of the light beam for the second area picture projected by the at least one half-wave plate, and the polarization direction of the first film layer is perpendicular to the polarization direction of the light beam for the second area picture projected by the at least one half-wave plate. In this way, the light beam for the first area picture is absorbed by the second film layer when it arrives at the second film layer. On the contrary, the light beam for the second area picture is absorbed by the first film layer when it arrives at the first film layer, i.e., it can be understood that the light beam for the first area picture projected through the first projection area of ​​the light assembly and the light beam for the second area picture projected through the second projection area do not interfere with each other.

[0018] Case 2: At least one second half-wave plate is located between the projector light engine and the light path of the first projection area, and the polarization direction of the light beam for the second area picture adjusted by the at least one second half-wave plate is perpendicular to the polarization direction of the light beam for the first area picture projected by the projector light engine. The polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer. The polarization direction of the second film layer is the same as the polarization direction of the light beam for the second area picture projected by the at least one half-wave plate, and the polarization direction of the first film layer is perpendicular to the polarization direction of the light beam for the second area picture projected by the at least one half-wave plate. In this way, the light beam for the first area picture is absorbed by the second film layer when it arrives at the second film layer. On the contrary, the light beam for the second area picture is absorbed by the first film layer when it arrives at the first film layer, i.e., it can be understood that the light beam for the first area picture projected through the first projection area of ​​the light assembly and the light beam for the second area picture projected through the second projection area do not interfere with each other.

[0019] In a possible design, the ghost elimination assembly includes a fourth reflector and a fifth reflector. The fourth reflector is configured to project a light beam for a first area picture and generated by the projector light engine onto a first projection area of ​​the light mirror group. The fifth reflector is configured to project a light beam for a second area picture and generated by the projector light engine onto a second projection area of ​​the light mirror group. The reflection angle of the fourth reflector is different from the reflection angle of the fifth reflector.

[0020] In the above design, the reflection angles of the two reflectors are different, so that the light beam for the first area picture and the light beam for the second area picture are separated by a certain interval when they arrive at the light assembly. In this way, the light beams of the two area pictures do not interfere with each other when they arrive at the light assembly.

[0021] In a possible design, the optical assembly includes a freeform primary mirror, the freeform primary mirror including a first projection area and a second projection area, in the freeform primary mirror a focal power in the first projection area differs from a focal power in the second projection area.

[0022] In the above design, the freeform primary mirrors with different focal powers are constructed in different areas so that the effect of the short focal surface and the long focal surface does not need to be achieved by adjusting the optical path length of the different area pictures, which reduces the assembly volume of the HUD device.

[0023] In a possible design, the head-up display device further includes a first reflector configured to perform a light path folding on a light beam for a first area picture projected by the PGU such that the light beam for the first area picture is reflected to a first projection area of ​​the primary free-form mirror, and to perform a light path folding on a light beam for a second area picture projected by the PGU such that the light beam for the second area picture is reflected to a second projection area of ​​the primary free-form mirror.

[0024] In the above design, the optical path folding is implemented by using reflectors so that the assembly between the components is more compact, which further reduces the assembly volume of the HUD device.

[0025] In a possible design, the head-up display device further includes a windshield, and the optical assembly includes a holographic optical element. ( HOE) The HOE thin film includes a thin film, the HOE thin film is attached to the windshield or the HOE thin film is located in the middle layer of the windshield, the HOE thin film includes a first projection area and a second projection area, in the HOE thin film, the focal power in the first projection area is different from the focal power in the second projection area. In the above design, the HOE thin film with different focal power is designed on the windshield so that the effect of the short focal surface and the long focal surface does not need to be achieved by adjusting the optical path length of the different area pictures. This reduces the assembly volume of the HUD device.

[0026] In a possible design, the optical assembly includes a first lens group and a second lens group, the focal power of the first lens group is different from that of the second lens group, the first lens group is located in a third projection area of ​​the optical assembly, and the second lens group is located in a fourth projection area of ​​the optical assembly. In the above design, the effect of the short focal surface and the long focal surface is achieved by using lenses, and the cost is low.

[0027] In a possible design, the device further includes a second reflector and a third reflector, the second reflector configured to perform a light path folding for a light beam for a first area picture projected by the PGU, such that a light beam for the first area picture is reflected by the first lens group, transmitted by the first lens group, arrives at the third reflector and is reflected by the third reflector to the windshield, and a light beam for a second area picture projected by the PGU, such that a light beam for the second area picture is reflected by the second lens group, transmitted by the second transmission group, arrives at the third reflector and is reflected by the third reflector to the windshield.

[0028] In the above design, the optical path folding is implemented by using reflectors so that the assembly between the components is more compact, which further reduces the assembly volume of the HUD device.

[0029] According to a second aspect, an embodiment of the present application provides a vehicle including a head-up display device according to any design of the first aspect or the second aspect.

[0030] According to a third aspect, an embodiment of the present application provides a head-up display method, the head-up display method being implemented in a head-up display device, the head-up display device including a picture generation unit: 、 PGU 、 and a light assembly. The head-up display method includes using the PGU to emit a light beam to be projected onto a picture, the picture to be projected including a first area picture and a second area picture, such that the light beam for the first area picture passes through a first projection area of ​​the light assembly and the light beam for the second area picture passes through a second projection area of ​​the light assembly. A focal power of a portion of the light assembly through which the light path of the light beam for the first area picture passes is different from a focal power of a portion of the light assembly through which the light path of the light beam for the second area picture passes, such that a virtual image corresponding to the first area picture and a virtual image corresponding to the second area picture are focused at different positions outside the windshield.

[0031] In a possible design, the head-up display device further includes a ghost elimination assembly.

[0032] The method further includes adjusting, by using the ghost elimination assembly, the light beam for the first area picture and / or the light beam for the second area picture input to the ghost elimination assembly such that the light beam for the first area picture and emitted through the first projection area of ​​the light assembly does not overlap with the light beam for the second area picture and emitted through the second projection area of ​​the light assembly.

[0033] In a possible design, the ghost removal assembly includes a first optical wedge and / or a second optical wedge. By using the ghost removal assembly, adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly can be performed by: a first optical wedge is located between the PGU and the light path of the first projection area, and by using the first optical wedge, adjusting the emission direction of the light beam emitted by the PGU, which is for the first area picture; or The second optical wedge is located between the PGU and the light path of the second projection area, and by using the second optical wedge, the emission direction of the light beam emitted by the PGU is adjusted for the second area picture. Includes.

[0034] In a possible design, the ghost elimination assembly includes at least a first half-wave plate, a first film layer, and a second film layer, where the first film layer is attached to a first projection area of ​​the light assembly and the second film layer is attached to a second projection area of ​​the light assembly.

[0035] By using the ghost removal assembly, adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly includes: At least one first half-wave plate is located between the PGU and the light path of the first projection area, and by using the at least one half-wave plate, a polarization direction of a light beam for a first area picture projected by the PGU is adjusted to be perpendicular to a polarization direction of a light beam for a second area picture projected by the PGU, where the polarization direction of the first film layer is perpendicular to the polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer; or At least one first half-wave plate is located between the PGU and the optical path of the first projection area, and by using the at least one half-wave plate, a polarization direction of a light beam for a second area picture is adjusted to be perpendicular to a polarization direction of a light beam for a first area picture projected by the PGU, where the polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer. Includes.

[0036] In a possible design, the PGU includes a projector light engine and a diffuser, the projector light engine configured to generate a light beam to be projected onto the picture, and the diffuser includes a third projection area and a fourth projection area.

[0037] The method comprises: uniformly projecting the light beam for the first area picture and received in the third projection area by using a diffuser on the first projection area of ​​the light assembly; and uniformly projecting the light beam for the second area picture and received in the fourth projection area on the second projection area of ​​the light assembly. Further includes:

[0038] In a possible design, the ghost cancellation assembly is disposed in the PGU, and the ghost cancellation assembly includes a third optical wedge and / or a fourth optical wedge.

[0039] By using the ghost removal assembly, adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly includes: The third optical wedge is located between the projector light engine and the light path of the third projection area, and by using the third optical wedge, the third optical wedge is for the first area picture, and adjusting the emission direction of the light beam emitted by the projector optical wedge; or The fourth optical wedge is located between the projector light engine and the light path of the fourth projection area, and by using the fourth optical wedge, the second area picture is for adjusting the emission direction of the light beam emitted by the projector light engine. Includes.

[0040] In a possible design, the ghost elimination assembly includes at least a second half-wave plate, a third film layer, and a fourth film layer, where the first film layer is attached to a first projection area of ​​the light assembly and the second film layer is attached to a second projection area of ​​the light assembly.

[0041] By using the ghost removal assembly, adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly includes: at least one second half-wave plate is located between the projector light engine and the light path of the third projection area, and by using the at least one second half-wave plate, adjusting the polarization direction of the light beam for the first area picture to be orthogonal to the polarization direction of the light beam for the second area picture and projected by the projector light engine, where the polarization direction of the first film layer is orthogonal to the polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is orthogonal to the polarization direction of the second film layer; or at least one second half-wave plate is located between the projector light engine and the light path of the first projection area, and by using the at least one second half-wave plate, a polarization direction of a light beam for the second area picture is adjusted to be perpendicular to a polarization direction of a light beam for the first area picture projected by the projector light engine, where the polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer; Includes.

[0042] In a possible design, the ghost elimination assembly includes a fourth reflector and a fifth reflector.

[0043] By using the ghost removal assembly, adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly includes: projecting the light beam generated by the projector light engine, the light beam being for a first area picture by using a fourth reflector on a first projection area of ​​the light mirror group; projecting the light beam generated by the projector light engine for a second area picture by using a fifth reflector on a second projection area of ​​the light mirror group; Includes.

[0044] The angle of reflection of the fourth reflector is different from the angle of reflection of the fifth reflector.

[0045] In a possible design, the optical assembly includes a freeform primary mirror, the freeform primary mirror including a first projection area and a second projection area, in the freeform primary mirror a focal power in the first projection area differs from a focal power in the second projection area.

[0046] In a possible design, the head-up display device further includes a first reflector.

[0047] The method comprises: performing optical path folding for an optical beam for a first area picture projected by the PGU, such that the optical beam for the first area picture is reflected to a first projection area of ​​the free-form primary mirror by using a first reflector; and performing optical path folding for an optical beam for a second area picture projected by the PGU, such that the optical beam for the second area picture is reflected to a second projection area of ​​the free-form primary mirror. Further includes:

[0048] In a possible design, the head-up display device further includes a windshield, and the optical assembly includes a holographic optical element. ( HOE ) The HOE thin film includes a thin film, the HOE thin film is attached to the windshield or the HOE thin film is located in an intermediate layer of the windshield, the HOE thin film includes a first projection area and a second projection area, and in the HOE thin film, the focal power in the first projection area is different from the focal power in the second projection area.

[0049] In a possible design, the light assembly includes a first lens group and a second lens group, where the focal power of the first lens group is different from the focal power of the second lens group, and the first lens group is located in a third projection area of ​​the light assembly and the second lens group is located in a fourth projection area of ​​the light assembly.

[0050] In a possible design, the apparatus further includes a second reflector and a third reflector.

[0051] The method comprises: performing optical path bending for the optical beam for the first area picture projected by the PGU by using a second reflector, such that the optical beam for the first area picture is reflected by the first lens group, transmitted by the first lens group, arrives at the third reflector, and is reflected by the third reflector to the windshield; and performing optical path bending for the optical beam for the second area picture projected by the PGU, such that the optical beam for the second area picture is reflected by the second lens group, transmitted by the second transmission group, arrives at the third reflector, and is reflected by the third reflector to the windshield. Further includes:

[0052] For technical effects achievable in any design of the third aspect, please refer to the description of the beneficial effects in the first aspect, and details will not be described again here. [Brief description of the drawings]

[0053] In order to describe the technical solutions in the embodiments of the present application more clearly, the following briefly describes the accompanying drawings to describe the embodiments.

[0054] [Figure 1] FIG. 2 is a diagram of possible application scenarios according to the present application. [Diagram 2] FIG. 1 is a diagram of a possible architecture for a HUD system. [Diagram 3] 1 is a diagram of a possible structure of a HUD device according to the present application. [Figure 4] 1 is a diagram of another possible configuration of a HUD device according to the present application. [Figure 5A] FIG. 1 is a diagram of a possible structure of a projector light engine according to the present application. [Figure 5B] FIG. 13 is a diagram of another possible structure of a projector light engine according to the present application. [Figure 5C] FIG. 13 is a diagram of yet another possible structure of a projector light engine according to the present application. [Figure 6] FIG. 13 is a diagram of yet another possible structure of a projector light engine according to the present application. [Figure 7A] FIG. 13 is a diagram of yet another possible structure of a projector light engine according to the present application. [Figure 7B] FIG. 13 is a diagram of yet another possible structure of a projector light engine according to the present application. [Figure 8] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 9] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 10] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 11] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 12] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 13] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 14] FIG. 2 is a diagram of a crosstalk scenario according to the present application. [Figure 15A] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 15B] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 16A]1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 16B] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 16C] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 16D] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 16E] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 16F] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 17] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 18A] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 18B] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 18C] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 18D] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 18E] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 18F] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 19] 1 is a diagram of yet another possible configuration of a HUD device according to the present application. [Figure 20] 1 is a diagram of a possible structure of a HUD system according to the present application. [Figure 21] FIG. 2 is a diagram of another possible configuration of a HUD system according to the present application. [Figure 22] FIG. 2 is a diagram of yet another possible configuration of a HUD system according to the present application. [Diagram 23] FIG. 2 is a diagram of yet another possible configuration of a HUD system according to the present application. [Figure 24]FIG. 2 is a diagram of yet another possible configuration of a HUD system according to the present application. [Diagram 25] FIG. 2 is a diagram of yet another possible configuration of a HUD system according to the present application. [Figure 26] 1 is a schematic flow chart of yet another possible HUD method according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0055] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0056] The head-up display (HUD) device provided in the embodiment of the present application may be used in a vehicle, or in another means of transportation such as an airplane, a spacecraft, or a ship. For ease of explanation, the present application uses a vehicle-mounted HUD as an example for explanation. However, it should be understood that this does not constitute a limitation to the present application.

[0057] FIG. 1 is a diagram of a scenario in which an in-vehicle HUD device is used in a vehicle. The HUD system is configured to project meter information (such as vehicle speed, temperature, fuel volume, etc.) and navigation information related to the vehicle into the driver's field of view through the vehicle's windshield. The virtual image corresponding to the navigation information can be superimposed on the real environment outside the vehicle so that the driver can obtain an augmented reality visual effect. For example, the HUD system can be used for AR navigation, adaptive cruise, and lane departure warning. In order to avoid interference with road conditions, the virtual image distance of the virtual image corresponding to the meter information is usually about 2 meters to 3 meters. For better combination of the virtual image corresponding to the navigation information with the real road surface, the virtual image distance of the virtual image corresponding to the navigation information is usually about 7 meters to 15 meters. The virtual image distance can be understood as the distance from the human eye to the center of the virtual image.

[0058] In order to reduce the volume of the HUD device, virtual image display in long virtual image distance and short virtual image distance can be implemented through different object distances by using one PGU. The object distance is the distance between the focal plane and the optical element in the object space. Figure 2 is a diagram of a possible structure of the HUD device. The PGU is divided into picture A and picture B in two different areas. After being transmitted by the PGU, picture A is reflected separately by the first reflective element A, the second curved reflective element A, and the second curved reflective element B, and then arrives at the windshield. Please refer to the solid line in Figure 2. After being transmitted by the PGU, picture B is reflected separately by the first reflective element A, the second curved reflective element B, and the third curved reflective element B, and then arrives at the windshield. Please refer to the solid line in Figure 2. reflection The reflected light is reflected by element B and then arrives at the windshield. See the dashed line in Figure 2. Although the above solution can reduce the amount of PGU used and reduce the cost, more optical elements need to be introduced to fold the optical path for different object distances. Therefore, there is a large amount of optical elements, and the difficulty of installation and adjustment increases.

[0059] Based on this, an embodiment of the present application provides a HUD device, so that the HUD system displays at least two virtual images with different virtual image distances, and only one PGU is used, and optical elements no longer need to be introduced to adjust the object distance, which facilitates the miniaturization of the HUD device.

[0060] 3 is a diagram of the structure of a HUD device according to one embodiment of the present application. The HUD device includes a picture generation unit 、 PGU 、The PGU 300 includes a PGU 300 and a light assembly 400. The PGU 300 is configured to generate a light beam to be projected onto a picture. The picture to be projected includes a first area picture and a second area picture. The PGU 300 emits a light beam to be projected onto the picture such that the light beam for the first area picture passes through a first projection area of ​​the light assembly and the light beam for the second area picture passes through a second projection area of ​​the light assembly. It may also be understood that the PGU 300 emits a light beam for the first area picture such that the light beam for the first area picture passes through a first projection area of ​​the light assembly. The PGU 300 emits a light beam for the second area picture such that the light beam for the second area picture passes through a second projection area of ​​the light assembly. The focal power of the portion of the light assembly 400 through which the optical path of the light beam for the first area picture passes is different from the focal power of the portion of the light assembly 400 through which the optical path of the light beam for the second area picture passes.

[0061] It may be understood herein that the focal power of a portion of the light assembly 400 through which the optical path of the light beam for the first area picture passes is different from the focal power of a portion of the light assembly 400 through which the optical path of the light beam for the second area picture passes, such that the light assembly 400 may be divided into two portions, the first portion corresponding to the first projection area and the second portion corresponding to the second projection area, and the focal power of the first portion is different from the focal power of the second portion. It may also be understood that the focal power in the first projection area of ​​the light assembly 400 is different from the focal power in the second projection area.

[0062] Focal power is the reciprocal of focal length and is used to measure the diopters of optical lenses, with the unit being D. When the focal length is 1m, the focal power is 1D, i.e. 1m-1. When the focal length is 2m, the focal power is 0.5D, etc. Focal length, also called focal distance, is a measurement method for measuring the convergence or divergence of light in an optical system. Focal length is the distance from the lens center to the focus of convergence of light, also called effective focal length.

[0063] Through the above HUD device, the first area picture and the second area picture are projected to different projection areas of the light assembly by using one PGU. Because the parts of different projection areas of the light assembly have different focusing powers, the different area pictures output from the HUD device can be focused to different depths, i.e., displayed as two virtual images with different virtual image distances. The HUD device only needs to use a single PGU, and does not need to increase the length of the light path of the area picture. Therefore, no reflection assembly is needed anymore. This helps simplify the assembly volume of the HUD device, and the complexity is low.

[0064] Optionally, the first area picture can be the same as the second area picture, i.e., the two virtual images with different virtual image distances are the same. In this way, the same virtual image with different virtual image distances can be implemented so that a dynamic zoom visual effect can be generated. For example, for a dynamic navigation pointer arrow extending forward, when the virtual image of this dynamic arrow enters the long focus optical path (the optical path forming the first virtual image may be called the long focus optical path), it is equivalent to the arrow going straight from a second position in a short focus location to a first position in the long focus optical path. For the driver, the visual may be that the arrow extends from near to far, creating a stereoscopic spatial sensation back and forth across the display. This can generate a visual effect similar to a dynamic zoom. The first area picture may alternatively be different from the second area picture. For example, the focal power of the first part of the light assembly 400 is smaller than the focal power of the second part. The first area picture carries navigation picture information, and the second area picture carries meter picture information. In other words, meter information is presented at a position closer to the driver and navigation information is presented at a position farther from the driver.

[0065] The following separately describes the functional components and structures shown in FIG. 3 to provide specific exemplary implementation solutions.

[0066] 1. PGU300

[0067] The PGU 300 may be implemented by using an active projection solution or a passive projection solution, which is not particularly limited in the embodiments of the present application.

[0068] A passive projector light engine is used in a passive projection solution. A passive projector light engine uses a passive picture source, which requires an additional light source to illuminate the picture modulation device. The passive picture source technology may use a liquid crystal on silicon (LCOS) technology solution, a digital light processing (DLP) technology solution, a light-emitting diode (LED) technology solution, or a laser beam scanning (LBS) technology solution. The light source may be a common side-emitting semiconductor laser light source, a light-emitting diode (LED) light source, a vertical cavity surface-emitting laser, etc. The wavelength of the light source may be a mixed spectrum monochromatic or white light. The picture modulation device may be a device such as an LCOS, a digital micromirror device (DMD), an LCD, or a micro-electromechanical system (MEMS). An active picture source may be used in an active projection solution. An active picture source is a picture modulation device that can implement picture modulation by turning off and lighting up pixels of different colors. The picture modulation device of the active picture source can be an Organic Light-Emitting Diode (OLED), a Micro-Organic Light-Emitting Diode (Micro-OLED), a Mini-Light-Emitting Diode (Mini-LED), a Micro-Light-Emitting Diode (Micro-LED) array module, etc.

[0069] 4 is a diagram of the structure of a PGU 300 using a passive projection solution. The PGU 300 includes a projector light engine 310 and a diffuser 320. The diffuser 320 includes a third projection area and a fourth projection area. The projector light engine 310 is configured to generate a light beam to be projected into a picture. The diffuser 320 uniformly projects a light beam for a first area picture and received in a third projection area to a first projection area of ​​the light assembly 400. The diffuser 320 uniformly projects a second area picture received in a fourth projection area to a second projection area of ​​the light assembly 400.

[0070] In particular, the diffuser 320 is responsible for projecting the light beams emitted by the projector light engine 310 to be projected on the first area picture and the light beams emitted by the projector light engine 310 to be projected on the second area picture at different angles, so that the light beams for the first area picture and the light beams for the second area picture are respectively projected on different projection areas of the light assembly 400. That is, the third projection area 320-1 and the second projection area 320-2 of the diffuser 320 use different projection angles. The diffuser 320 can be a reflective diffuser or a transmissive diffuser. This is not particularly limited in the embodiment of the present application.

[0071] The following describes some configurations of the projector light engine 310.

[0072] 5A is a diagram of a possible structure of a projector light engine 310 using a passive picture source. The projector light engine 310 includes an illumination assembly 311 and an imaging assembly 312. The illumination assembly 311 is configured to emit a light beam. The imaging assembly 312 is configured to modulate a picture to be projected, including a first area picture and a second area picture, onto the light beam emitted by the light source.

[0073] See FIG. 5B. The illumination assembly 311 may include a light source 3111-1 and a transmission illumination light path 3112-1. The imaging assembly 312 includes a picture modulation device 3121-1 and a projection lens 3122-1. After the light beam emitted by the light source 3111-1 passes through the transmission illumination light path 3112-1, the light beam is transmitted to the picture modulation device 3121-1 and then projected by the projection lens 3122-1. The picture modulation device 3121-1 may be a transmission modulation chip, for example, an LCD. The picture modulation device 3121-1 may include two areas, where one area is used to modulate a first area picture and the other area is used to modulate a second area picture.

[0074] See FIG. 5C. The illumination assembly 311 includes a light source 3111-2 and a reflected illumination light path 3112-2. The imaging assembly 312 includes a picture modulation device 3121-2 and a projection lens 3122-2. The light beam emitted by the light source 3111-2 passes through the reflected illumination light path 3112-2, is reflected to the picture modulation device 3121-2, and is then projected by the projection lens 3122-2. The picture modulation device 3121-2 can be a device such as a transmissive modulation chip, for example, LCOS, DMD, or LCD. The picture modulation device 3121-2 can include two areas, where one area is used to modulate a first area picture, and the other area is used to modulate a second area picture.

[0075] In some embodiments, the transmissive modulation chip controls the angle of incidence of the light beam by using the illumination assembly 311, so that the light beam enters the picture modulation device 3121-2 at a specific angle so that the picture modulation device 3121-2 is in an optimal working condition.

[0076] 6, 7A, and 7B are diagrams of another possible structure of the projector light engine 310 using a passive picture source. The projector light engine 310 includes an illumination assembly 311, an imaging assembly 312, and a reflector 313. The difference between the structure of the projector light engine 310 shown in FIG. 6 and the structure of the projector light engine shown in FIG. 5A is that in the structure of the projector light engine 310 shown in FIG. 6, the reflector 313 is added after the imaging assembly 312. The reflector 313 is configured to perform light path folding to obtain a more compact volume. The reflector 313 can be a curved reflector or a planar reflector. This is not limited in particular in the embodiment of the present application. FIG. 7A and FIG. 7B are obtained based on FIG. 6 by using the illumination assembly 311 and the imaging assembly 312 with the structures of FIG. 5B and FIG. 5C.

[0077] FIG. 8 is a diagram of the structure of a HUD device using an active picture light emitting source. The PGU 300 may use an active picture light emitting source 330. The active picture light emitting source 330 may be an OLED / Micro-OLED or Micro / Mini-LED array panel, which implements area-based adjustment and control to display a picture source including a first area picture and a second area picture. See FIG. 8. The active picture light emitting source 330 includes a first section 330-1 and a second section 330-2. Compared with the structure of the PGU 300 using a passive picture source, the structure of the PGU 300 using an active picture source is simple and can be implemented without a projection system. The brightness of the active picture source is lower than that of the passive picture source.

[0078] 2. Optical Assembly 400

[0079] See the HUD device shown in Figure 9. In a first possible manner, the optical assembly 400 may use a freeform primary mirror 410. The freeform primary mirror 410 includes a first curved reflective area 410-1 (which may be understood as a first projection area) and a second curved reflective area 410-2 (which may be understood as a second projection area). In the freeform primary mirror, the focal power in the first curved reflective area 410-1 is different from the focal power in the second curved reflective area 410-2.

[0080] See Fig. 10. In a second possible manner, the optical assembly 400 may include a holographic optical element (HOE) thin film 420, which is attached to the windshield, and which includes a projection area 420-1 and a projection area 420-2, where the focal power in the projection area 420-1 is different from the focal power in the projection area 420-2. The HOE thin film 420 may be attached to the outside of the windshield, or may be attached to the inside of the windshield, or may be used as an intermediate layer of the windshield. This is not limited in the present application.

[0081] The HOE thin film 420 can be, in particular, a volume Bragg grating (VBG) or a surface relief grating (SRG). For light reflection and focusing, the internal refractive index of the VBG varies periodically, and the surface structure of the SRG varies periodically, so that the incident light can be modulated by using the internal refractive index grating or the relief grating.

[0082] See the HUD device shown in FIG. 11. In a third possible scheme, the light assembly 400 includes a first lens group 470 and a second lens group 480. The first lens group 470 includes one or more lenses. The second lens group 480 includes one or more lenses. The focal power of the first lens group 470 is different from the focal power of the second lens group 480. The PGU 300 projects a light beam for a first area picture to the first lens group 470. The PGU 300 projects a light beam for a second area picture to the second lens group 480.

[0083] In some embodiments, a reflector may be further disposed in the HUD device to perform optical path folding to reduce the volume of the HUD device. The location of the reflector is not particularly limited in the embodiments of the present application.

[0084] For example, see the HUD device shown in FIG. 12. The HUD device further includes a reflector 430. In FIG. 12, for example, the light assembly 400 uses a free-form primary mirror 410. The PGU 300 projects a light beam for a first area picture and a light beam for a second area picture to the reflector 430. The reflector 430 reflects the received light beam for the first area picture to a first curved reflective area 410-1 of the free-form primary mirror and reflects the received light beam for the second area picture to a second curved reflective area 410-2 of the free-form primary mirror. The reflector 430 can be a planar reflector or a curved reflector. This is not limited in particular to the embodiments of the present application. The free-form primary mirror 410 projects a light beam onto the windshield that is for a first area picture and is received in a first curved reflective area 410-1 (corresponding to the first projection area of ​​the light assembly 400) and projects a light beam onto the windshield that is for a second area picture and is received in a second curved reflective area 410-2 (corresponding to the second projection area of ​​the light assembly 400).

[0085] For another example, refer to the HUD device shown in FIG. 13. The HUD device includes a reflector 450 and a reflector 460. The PGU 300 emits a light beam to be projected onto a picture, where the picture to be projected includes a first area picture and a second area picture. It can be understood that the projector light engine 310 emits a light beam to be projected onto the first area picture and a light beam to be projected onto the second area picture. The PGU 300 projects a light beam for the first area picture and a light beam for the second area picture onto the reflector 450. The reflector 450 reflects the received light beam for the first area picture onto the first lens group 470, where the light beam for the first area picture is projected onto the first area picture. lens After being transmitted by group 470, the light arrives at the first reflecting area of ​​reflector 460 and is reflected to the windshield through the first reflecting area. Reflector 450 reflects the received light beam for the second area picture to the second lens group 480, and the light beam for the second area picture is reflected to the second lens group 490. lens After being transmitted by group 480, it reaches the second reflective area of ​​reflector 460 and is reflected through the second reflective area to the windshield.

[0086] In some scenarios, the PGU 300 projects the first area picture and the second area picture by using the same plane that contains the two areas, and since the distance between the two areas is short, the light beam for the first area picture and the light beam for the second area picture may overlap when arriving at the light assembly 400. As a result, crosstalk exists between the displayed first area picture and the displayed second area picture. In one example, a passive picture light emitting source is used, and the light assembly 400 uses a free-form primary mirror 410. The third projection area 320-1 and the fourth projection area 320-2 of the diffuser 320 are located on the same plane and close to each other, so that the light beam emitted through the third projection area 320-1 and arriving at the free-form primary mirror 410 overlaps with the light beam emitted through the fourth projection area 320-2 and arriving at the free-form primary mirror 410. As a result, crosstalk exists between the virtual image of the first area picture and the virtual image of the second area picture, i.e., the image at the short virtual image distance (or called the short focal surface) contains a portion of the content at the long virtual image distance (or called the long focal surface), and the image at the long virtual image distance contains a portion of the content at the short virtual image distance. See FIG. 14. For example, the first projection area 320-1 of the diffuser 320 corresponds to the image on the short focal surface, and the second projection area 320-2 corresponds to the image on the long focal surface. See (a) of FIG. 14. The picture on the short focal surface and the picture on the long focal surface are located on one plane and are close to each other. When the pictures are projected separately onto the two projection areas of the free-form primary mirror 410, the light part of the picture on the short focal surface is that of the picture on the long focal surface and enters the area on the light assembly 400. As a result, crosstalk occurs between the far virtual image surface and the near virtual image surface. As shown in (b) of FIG. 14, the picture on the short focal surface and the picture on the long focal surface are located on one plane and close to each other. When the pictures are projected separately onto the two projection areas of the free-form primary mirror 410, the light part of the picture on the short focal surface is that of the picture on the long focal surface and enters the area on the light assembly 400. b14, for example, the long focal surface is marked by using 201 and the short focal surface is marked by using 202. See FIG. 14(b). The picture on the long focal surface 201 includes a portion of the picture on the short focal surface 202.

[0087] In this embodiment of the present application, the ghost removal assembly 500 may be disposed in a HUD device. The ghost removal assembly 500 adjusts the light beams for the two area pictures and that can pass through the first projection area and the second projection area of ​​the light assembly 400 so that they do not interfere with each other. That is, the ghost removal assembly 500 adjusts the light beams for the first area picture and / or the light beams for the second area picture that are input to the ghost removal assembly 500 so that the light beams for the first area picture and that are emitted through the first projection area of ​​the light assembly 400 and the light beams for the second area picture and that are emitted through the second projection area of ​​the light assembly 400 do not interfere with each other (e.g., do not overlap).

[0088] 15A and 15B, the ghost elimination assembly 500 may be disposed within the PGU 300 or may be disposed between the PGU 300 and the optical path of the optical assembly 400.

[0089] The following describes the structure of the ghost removal assembly.

[0090] In a first possible implementation, for example, the ghost elimination assembly uses an optical wedge.

[0091] Example 1

[0092] The ghost removal assembly 500 includes an optical wedge 510. The optical wedge 510 is located in the optical path where the light beam for the first area picture will arrive at the light assembly 400.

[0093] See Figure 16A. A PGU 300 using a passive picture light emission source is used as an example. An optical wedge 510 can be placed between the light path of the third projection area of ​​the diffuser 320 and the light path of the first projection area.

[0094] The projector light engine 310 emits a light beam to be projected onto the first area picture and a light beam to be projected onto the second area picture, which are projected onto the third and fourth projection areas of the diffuser 320, respectively, i.e., the light beam to be projected onto the first area picture is projected onto the third projection area 320-1 of the diffuser 320, and the light beam to be projected onto the second area picture is projected onto the fourth projection area 320-2 of the diffuser 320. After the light beam to be projected onto the first area picture and projected through the third projection area 320-1 is refracted by the optical wedge 510, the light beam to be projected onto the first area picture is deflected in a direction away from the second projection area such that the light beam for the first area picture and the light beam for the second area picture are separated by a spacing after the light beam to be projected onto the first area picture is refracted by the optical wedge 510. This avoids crosstalk.

[0095] It should be noted that the optical wedge 510 may belong to the PGU 300 , i.e., be located within the PGU 300 , or may not belong to the PGU 300 , i.e., be located outside the PGU 300 .

[0096] See Fig. 16B. A PGU 300 using a passive picture light emission source is used as an example. An optical wedge 510 is located between the projector light engine 310 and the light path of the first projection area of ​​the diffuser 320. The projector light engine 310 emits a light beam to be projected on the first area picture and a light beam to be projected on the second area picture. After the light beam to be projected on the first area picture passes through the optical wedge 510, the emission direction of the light beam to be projected on the first area picture is deflected so that the light beam to be projected on the first area picture and the light beam to be projected on the second area picture are separated by a certain interval before arriving at the diffuser 320. In this way, the first projection area 320-1 of the diffuser 320 projects the light beam for the first area picture to the third projection area of ​​the light assembly 400, and the first projection area 320-2 of the diffuser 320 projects the light beam for the second area picture to the fourth projection area of ​​the light assembly 400. Since the light beam to be projected to the first area picture and the light beam to be projected to the second area picture are already separated by a certain interval before arriving at the diffuser 320, the light beam for the first area picture and the light beam for the second area picture do not overlap after arriving at the light assembly 400. Therefore, image crosstalk between the long focal surface and the short focal surface can be avoided.

[0097] Example 2

[0098] The ghost removal assembly 500 includes an optical wedge 520. The optical wedge 520 is located in the optical path where the light beam for the second area picture arrives at the optical assembly 400.

[0099] Please refer to FIG. 16C. A PGU 300 using a passive picture light emission source is used as an example. An optical wedge 520 can be disposed between the optical path of the fourth projection area of ​​the diffuser 320 and the optical path of the second projection area of ​​the light assembly 400. In FIG. 16C, the optical wedge 520 deflects the light beam that is projected through the fourth projection area of ​​the diffuser 320 and is to be projected on the second area picture in a direction away from the first projection area of ​​the light assembly 400, so that the light beam that is for the second area picture and arrives at the light assembly 400 and the light beam that is for the first area picture and arrives at the light assembly 400 are separated by a distance after the light beam that is to be projected on the second area picture is refracted by the optical wedge 520. This avoids image crosstalk between the long focal surface and the short focal surface.

[0100] See Fig. 16D. A PGU 300 using a passive picture light emission source is used as an example. An optical wedge 520 is located between the projector light engine 310 and the light path of the fourth projection area of ​​the diffuser 320. The projector light engine 310 emits a light beam to be projected on the first area picture and a light beam to be projected on the second area picture. After the light beam to be projected on the second area picture passes through the optical wedge 520, the emission direction of the light beam to be projected on the second area picture is deflected so that the light beam to be projected on the second area picture and the light beam to be projected on the first area picture are separated by a certain interval before arriving at the diffuser 320. In this way, the third projection area 320-1 of the diffuser 320 projects the light beam for the first area picture to the first projection area of ​​the light assembly 400, and the fourth projection area 320-2 of the diffuser 320 projects the light beam for the second area picture to the second projection area of ​​the light assembly 400. Because the light beam to be projected to the second area picture and the light beam to be projected to the first area picture are already separated by a certain interval before arriving at the diffuser 320, the light beam for the first area picture and the light beam for the second area picture do not overlap after arriving at the light assembly 400. Therefore, image crosstalk between the long focal surface and the short focal surface can be avoided.

[0101] In some embodiments, the optical wedges may be disposed in the optical paths of the light beams for the first area picture and the second area picture, respectively. For example, the ghost removal assembly 500 includes an optical wedge 510 and an optical wedge 520 as shown in FIG. 16E and FIG. 16F. In FIG. 16E, the optical wedge 510 and the optical wedge 520 are disposed between the diffuser 320 and the light assembly 400. In FIG. 16F, the optical wedge 510 and the optical wedge 520 are disposed between the projector light engine 310 and the diffuser 320.

[0102] In a second possible implementation, the ghost removal assembly uses multiple reflectors, and the reflectors can be planar reflectors or curved reflectors. For example, two planar reflectors, planar reflector 530 and planar reflector 540, are disposed in PGU 300. Planar reflector 530 and planar reflector 540 can be disposed at different positions in the light path before the third projection area and the fourth projection area, and are configured to increase the spacing between the light beam for the first area picture arriving at the light assembly 400 and the light beam for the second area picture arriving at the light assembly 400. See FIG. 17. The planar reflector 530 projects the light beam generated by the projector light engine 310 for the first area picture onto a third projection area of ​​the diffuser 320, and the planar reflector 540 projects the light beam generated by the projector light engine 310 for the second area picture onto a fourth projection area of ​​the diffuser 320.

[0103] In a third possible implementation, the ghost removal assembly 500 may alternatively adjust the polarization direction of the light beam for the first area picture and the light beam for the second area picture. For example, the polarization direction of the light beam for the first area picture is perpendicular to the polarization direction of the light beam for the second area picture. Thus, even if there is an overlap between the light beam for the first area picture and the light beam for the second area picture, crosstalk can be avoided due to the different polarization directions.

[0104] The ghost removal assembly 500 uses at least one half-wave plate and a film layer attached to the first and second projection areas of the optical assembly 400. The at least one half-wave plate can be placed at different positions in the light path before the first and second projection areas. The film layer can be a reflective film or a transmissive film. For example, if the polarization direction of the film layer is A, the reflective film reflects light with a polarization direction A and blocks light with another polarization direction. The transmissive film transmits light with a polarization direction A and blocks light with another polarization direction.

[0105] Method 1

[0106] The ghost elimination assembly 500 includes a half-wave plate 550, a film layer 560-1, and a film layer 560-2. The film layer 560-1 is attached to a first projection area of ​​the light assembly 400, and the film layer 560-2 is attached to a second projection area of ​​the light assembly 400. The half-wave plate 550 may be placed before the light path where the light beam for the first area picture arrives at the film layer 560-1. The polarization direction of the film layer 560-1 is perpendicular to the polarization direction of the film layer 560-2.

[0107] See FIG. 18A. For example, PGU 300 uses a passive light emission source. Half-wave plate 550 is located between the third projection area of ​​diffuser 320 and the light path of film layer 560-1. Projector light engine 310 emits a light beam to be projected on the first area picture and a light beam to be projected on the second area picture, and the light beams are projected on the third projection area and the fourth projection area of ​​diffuser 320, respectively, that is, the light beam to be projected on the first area picture is projected on the third projection area 320-1 of diffuser 320, and the light beam to be projected on the second area picture is projected on the fourth projection area 320-2 of diffuser 320. After the light beam to be projected on the first area picture and projected through the third projection area 320-1 passes through the half-wave plate 550, the half-wave plate 550 adjusts the polarization direction of the light beam for the first area picture such that the polarization direction of the light beam for the first area picture and emitted by the half-wave plate 550 is perpendicular to the polarization direction of the light beam for the second area picture projected through the fourth projection area 320-2. The polarization direction of the film layer 560-1 is perpendicular to the polarization direction of the light beam for the first area picture projected through the fourth projection area, i.e., the polarization direction of the film layer 560-1 is the same as the polarization direction of the light beam for the first picture area and output by the half-wave plate 550. The polarization direction of the film layer 560-1 is perpendicular to the polarization direction of the film layer 560-2. When the light beam for the second area picture enters film layer 560-1, the light beam is absorbed by film layer 560-1. When the light beam for the first area picture enters film layer 560-2, the light beam is absorbed by film layer 560-2.

[0108] See Fig. 18B. For example, PGU 300 uses an active picture light emitting source. Half-wave plate 550 is located between the projection area 330-1 of active picture light emitting source 330 and the light path of film layer 560-1. The polarization direction of film layer 560-1 is perpendicular to the polarization direction of the light beam for the second area picture projected through section 330-2, and the polarization direction of film layer 560-1 is for the first picture area and is the same as the polarization direction of the light beam output by half-wave plate 550.

[0109] See FIG. 18C. For example, PGU 300 uses a passive light emission source. Half-wave plate 550 is located between projector light engine 310 and the light path of third projection area 320-1 of diffuser 320. Half-wave plate 550 adjusts the polarization direction of the light beam for the first area picture and emitted by projector light engine 310 to be perpendicular to the polarization direction of the light beam for the second area picture and emitted by projector light engine 310. The polarization direction of film layer 560-1 is the same as the polarization direction of the light beam for the first area picture projected through third projection area 320-1, and the polarization direction of film layer 560-1 is the same as the polarization direction of the light beam for the first picture area and output by half-wave plate 550. The polarization direction of film layer 560-1 is perpendicular to the polarization direction of film layer 560-2. When the light beam for the second area picture enters film layer 560-1, the light beam is absorbed by film layer 560-1. When the light beam for the first area picture enters film layer 560-2, the light beam is absorbed by film layer 560-2.

[0110] See FIG. 18D. For example, PGU 300 uses a passive light emission source. Half-wave plate 550 is located between the fourth projection area 320-2 of diffuser 320 and the light path of film layer 560-2. Different from that of FIG. 18A, the polarization direction of the light beam for the second area picture is changed after passing through half-wave plate 550 such that the polarization direction of the light beam passing through half-wave plate 550 is perpendicular to the polarization direction of the light beam for the first area picture projected through the first projection area. The polarization direction of film layer 560-1 is perpendicular to the polarization direction of the light beam for the third projection area 320- 1 The polarization direction of the film layer 560-1 is the same as the polarization direction of the light beam for the first area picture projected through the half-wave plate 550, and the polarization direction of the film layer 560-2 is for the second picture area and is perpendicular to the polarization direction of the light beam output by the half-wave plate 550. The polarization direction of the film layer 560-1 is perpendicular to the polarization direction of the film layer 560-2. When the light beam for the second area picture enters the film layer 560-1, the light beam is absorbed by the film layer 560-1. When the light beam for the first area picture enters the film layer 560-2, the light beam is absorbed by the film layer 560-2.

[0111] See Fig. 18E. For example, PGU 300 uses an active picture light emitting source. Half-wave plate 550 is located between the projection area 330-2 of active picture light emitting source 330 and the light path of film layer 560-2. The polarization direction of film layer 560-1 is the same as the polarization direction of the light beam for the first area picture projected through section 330-1, and the polarization direction of film layer 560-2 is for the second picture area and is the same as the polarization direction of the light beam output by half-wave plate 550.

[0112] See FIG. 18F. For example, PGU 300 uses a passive light emission source. Half-wave plate 550 is located between projector light engine 310 and the light path of fourth projection area 320-2. Half-wave plate 550 adjusts the polarization direction of the light beam for the second area picture and emitted by projector light engine 310 to be perpendicular to the polarization direction of the light beam for the first area picture and emitted by projector light engine 310. The polarization direction of film layer 560-1 is the same as the polarization direction of the light beam for the first area picture projected through third projection area 320-1, and the polarization direction of film layer 560-2 is the same as the polarization direction of the light beam for the second picture area and output by half-wave plate 550. The polarization direction of film layer 560-1 is perpendicular to the polarization direction of film layer 560-2. When the light beam for the second area picture enters film layer 560-1, the light beam is absorbed by film layer 560-1. When the light beam for the first area picture enters film layer 560-2, the light beam is absorbed by film layer 560-2.

[0113] In a fourth example, in this embodiment of the present application, the diffuser 320 can be two diffusers of an optical wedge structure, which are diffuser 321 and diffuser 322. See FIG. 19. The diffuser 321 and diffuser 322 using an optical wedge structure are used so that there is a certain interval between the light beam for the first area picture and output by diffuser 321 and the light beam for the second area picture and output by diffuser 322. In this way, the light beam for the first area picture and the light beam for the second area picture do not overlap after arriving at the light assembly 400. This avoids image crosstalk between the long focal surface and the short focal surface.

[0114] Based on the above content, the following provides an architecture diagram of a HUD system used in a vehicle, including a HUD device and a windshield, to facilitate further understanding of the HUD device and the implementation process used by the HUD device to display virtual images at different virtual image distances in terms of a specific hardware structure.

[0115] 20 is a diagram of the structure of a HUD system according to one embodiment of the present application. The HUD system includes a HUD device and a windshield. In FIG. 20, for example, a picture generation unit 、 PGU 、300 uses a passive picture source, the ghost elimination assembly uses an optical wedge, and the light assembly 400 uses a freeform primary mirror. For example, a first curved reflective area 410-1 of the freeform primary mirror 410 corresponds to a short focal surface, and a second curved reflective area 410-2 of the freeform primary mirror 410 corresponds to a long focal surface. For ease of explanation, the first curved reflective area is referred to as the freeform short focal area 201 and the second curved reflective area 410-2 is referred to as the freeform long focal area 202 herein. The HUD system includes a projector light engine 310, a diffuser 320, an optical wedge 510, the freeform primary mirror 410, and a windshield 600. The projector light engine 310 emits a light beam that is to be projected onto a picture. The light beam to be projected includes a first area picture and a second area picture. That is, the projector light engine 310 emits a light beam to be projected on the first area picture and a light beam to be projected on the second area picture. The light beam is projected on two areas of the diffuser 320, which are a third projection area 320-1 (sometimes called a short focal surface area) and a fourth projection area 320-2 (long focal surface area), respectively. For the position of the optical wedge 510, please refer to FIG. 16A to FIG. 16F. The details will not be described again here. In FIG. 20, for example, the optical wedge 510 is disposed between the short focal surface area and the free-form primary mirror 410. After the light beam for the first area picture projected through the short focal surface area 121 passes through the optical wedge 510, the light beam for the first area picture is deflected and the light beam for the second area picture is projected onto the first curved reflective area 410-1 and the second curved reflective area 410-2 of the free-form primary mirror 410. In this specification, for ease of explanation, the first curved reflective area is referred to as the free-form short focal area 201 and the second curved reflective area 410-2 is referred to as the free-form long focal area 202.Furthermore, the free-form short focal area 201 projects a light beam onto the windshield that will be projected onto a first area picture, and the free-form long focal area 202 projects a light beam onto the windshield that will be projected onto a second area picture. The light beam for the first area picture and the light beam for the second area picture are reflected through the windshield to the human eye. Finally, two images corresponding to the short focal surface 501 and the long focal surface 502 are presented to the human eye. The first area picture is displayed in the image on the short focal surface 501, and the second area picture is displayed in the image on the long focal surface 502.

[0116] 21 is a diagram of another structure of a HUD system according to an embodiment of the present application. In FIG. 21, for example, a picture generation unit 、 PGU 、300 uses a passive picture source, the ghost elimination assembly uses two planar reflectors, and the light assembly uses a freeform primary mirror. For example, a first curved reflective area 410-1 of the freeform primary mirror 410 corresponds to a short focal surface, and a second curved reflective area 410-2 of the freeform primary mirror 410 corresponds to a long focal surface. For ease of explanation, the first curved reflective area is referred to as the freeform short focal area 201 and the second curved reflective area 410-2 is referred to as the freeform long focal area 202 herein. The HUD system includes a projector light engine 310, a diffuser 320, a planar reflector 530, a planar reflector 540, an optical wedge 510, the freeform primary mirror 410, and a windshield 600. The projector light engine 310 emits a light beam that is to be projected onto a picture. The light beams to be projected include a first area picture and a second area picture. That is, the projector light engine 310 emits a light beam to be projected on the first area picture and a light beam to be projected on the second area picture. The planar reflector 530 projects the light beam for the first area picture and generated by the projector light engine 310 to the third projection area 320-1 (sometimes called the short focal surface area) of the diffuser 320, and the reflector 540 projects the light beam for the second area picture and generated by the projector light engine 310 to the fourth projection area 320-2 (long focal surface area) of the diffuser 320. The light beam for the first area picture is projected through the short focal surface area to the free-form short focal area 201, and the light beam for the second area picture is projected through the long focal surface area to the free-form long focal area 202. Furthermore, the light beam to be projected onto the first area picture is projected onto the windshield 600 through the free-form short focus area 201, and the light beam to be projected onto the second area picture is projected onto the windshield 600 through the free-form long focus area 202.The light beam for the first area picture and the light beam for the second area picture are reflected to the human eye through the windshield. Finally, two images corresponding to the short focal surface and the long focal surface are presented to the human eye. The first area picture is displayed in the image on the short focal surface, and the second area picture is displayed in the image on the long focal surface.

[0117] 22 is a diagram of another structure of a HUD system according to an embodiment of the present application. In FIG. 22, for example, a picture generation unit 、 PGU 、300 uses an active picture source 330 and the light assembly uses a freeform primary mirror. For example, a first curved reflective area 410-1 of the freeform primary mirror 410 corresponds to a short focal surface, and a second curved reflective area 410-2 of the freeform primary mirror 410 corresponds to a long focal surface. For ease of explanation, the first curved reflective area is referred to as the freeform short focal area 201 and the second curved reflective area 410-2 is referred to as the freeform long focal area 202 herein. The HUD system includes an active picture source 330, a freeform primary mirror 410, and a windshield 600. The active picture source 330 emits a light beam to be projected onto a picture. The light beam to be projected includes a first area picture and a second area picture. The active picture source 330 includes two sections, referred to as section 330-1 and section 330-2 in FIG. 22. The light beam to be projected on the first area picture is emitted through section 330-1, and the light beam to be projected on the second area picture is emitted through section 330-2. The HUD system further includes an optical wedge. For the arrangement position of the optical wedge, please refer to FIG. 16A to FIG. 16F. The details will not be described again here. In FIG. 22, for example, the HUD system includes an optical wedge 510. After the light beam for the first area picture projected through section 330-1 passes through the optical wedge 510, the light beam for the first area picture is deflected and projected on the free-form short focus area 201 of the free-form primary mirror 410. The light beam for the second area picture is projected on the free-form long focus area 202 of the free-form primary mirror 410 through section 330-2. Furthermore, the light beam to be projected onto the first area picture is projected onto the windshield 600 through the free-form short focus area 201, and the light beam to be projected onto the second area picture is projected onto the windshield 600 through the free-form long focus area 202. The light beam for the first area picture and the light beam for the second area picture are reflected through the windshield to the human eye.Finally, two images corresponding to the short focal surface and the long focal surface are presented to the human eye: a first area picture is displayed in the image on the short focal surface, and a second area picture is displayed in the image on the long focal surface.

[0118] 23 is a diagram of yet another structure of a HUD system according to an embodiment of the present application. In FIG. 23, for example, a picture generation unit 、 PGU 、 300 uses a passive picture source, and the light assembly 400 figure17, the ghost elimination assembly uses an optical wedge. The HUD system includes a projector light engine 310, a diffuser 320, an optical wedge, and a light assembly 400. For example, the HUD system includes an optical wedge 510. For example, the light assembly 400 includes a reflector 450, a reflector 460, a first lens group 470, and a second lens group 480. The first lens group 470 includes one or more lenses. The second lens group 480 includes one or more lenses. The focal power of the first lens group 470 is different from the focal power of the second lens group 480. The projector light engine 310 emits a light beam to be projected onto a picture, where the picture to be projected includes a first area picture and a second area picture. It can be seen that the projector light engine 310 emits a light beam to be projected on the first area picture and a light beam to be projected on the second area picture. The light beams are respectively projected on two areas of the diffuser 320, which are the third projection area 320-1 (sometimes referred to as the short focal surface area) and the fourth projection area 320-2 (sometimes referred to as the long focal surface area). After the light beam for the first area picture projected through the short focal surface area passes through the optical wedge 510, the light beam for the first area picture is deflected and projected to the reflector 450. The light beam for the second area picture is projected through the long focal surface area to the reflector 450. The reflector 450 reflects the received light beam for the first area picture to the first lens group 470, and the light beam for the first area picture arrives at a first reflective area of ​​the reflector 460 after being transmitted by the first transmission group and is reflected to the windshield through the first reflective area. The reflector 450 reflects the received light beam for the second area picture to the second lens group 480, and the light beam for the second area picture arrives at a first reflective area of ​​the reflector 460 after being transmitted by the first transmission group and is reflected to the windshield through the first reflective area. lensAfter being transmitted by group 480, the light beam arrives at the second reflecting area of ​​reflector 460 and is reflected to the windshield through the second reflecting area. The light beam for the first area picture and the light beam for the second area picture are reflected to the human eye through the windshield. Finally, two images corresponding to the short focal surface and the long focal surface are presented to the human eye. The first area picture is displayed in the image on the short focal surface, and the second area picture is displayed in the image on the long focal surface.

[0119] 24 is a diagram of yet another structure of a HUD system according to an embodiment of the present application. In FIG. 24, for example, a picture generation unit 、 PGU 、300 uses a passive picture source, the light assembly 400 uses a freeform primary mirror 410, and the ghost elimination assembly uses an optical wedge 510. The HUD system includes a projector light engine 310, a diffuser 320, an optical wedge 510, a reflector 430, a freeform primary mirror 410, and a windshield 600. For example, the diffuser 320 is a transmissive diffuser. The projector light engine 310 emits a light beam to be projected onto a picture. The light beam to be projected includes a first area picture and a second area picture. That is, the projector light engine 310 emits a light beam to be projected onto the first area picture and a light beam to be projected onto the second area picture. The light beams are projected onto two areas of the diffuser 320, respectively, a third projection area 320-1 (sometimes referred to as a short focal surface area) and a fourth projection area 320-2 (sometimes referred to as a long focal surface area). After the light beams for the first area picture are transmitted through the short focal surface area, the light beams for the first area picture are deflected by the optical wedge 510 and projected onto the reflector 430. The light beams for the second area picture are transmitted through the long focal surface area to the reflector 430. The reflector 430 reflects the received light beams for the first area picture to the first curved reflective area 410-1 of the free-form primary mirror 410, and reflects the received light beams for the second area picture, which are transmitted through the long focal surface area, to the second curved reflective area 410-2 of the free-form primary mirror. The freeform primary mirror 410 projects onto the windshield a light beam for a first area picture that is received in a first curved reflective area 410-1 and projects onto the windshield a light beam for a second area picture that is received in a second curved reflective area 410-2. In the freeform primary mirror 410, the focal power in the first curved reflective area 410-1 is different from the focal power in the second curved reflective area 410-2.The light beam for the first area picture and the light beam for the second area picture are reflected to the human eye through the windshield. Finally, two images corresponding to the short focal surface and the long focal surface are presented to the human eye. The first area picture is displayed in the image on the short focal surface, and the second area picture is displayed in the image on the long focal surface.

[0120] 25 is a diagram of yet another structure of a HUD system according to an embodiment of the present application. In FIG. 25, a reflective diffuser is used as an example. For example, the light assembly 400 uses a freeform primary mirror 410, the ghost reduction assembly uses an optical wedge, and the ghost reduction assembly 500 includes an optical wedge 510. The HUD system includes a projector light engine 310, a diffuser 320, an optical wedge 510, a reflector 430, a freeform primary mirror 440, and a windshield. 625 includes a first area picture and a second area picture. That is, the projector light engine 310 emits a light beam to be projected to the first area picture and a light beam to be projected to the second area picture. The light beam is projected to two areas of the diffuser 320, which are a third projection area 320-1 (sometimes called a short focal surface area) and a fourth projection area 320-2 (sometimes called a long focal surface area), respectively. In FIG. 25, for example, the optical wedge 510 is disposed between the short focal surface area and the reflector 430. After the light beam for the first area picture is reflected through the short focal surface area, the light beam for the first area picture is deflected by the optical wedge 510 and projected to the reflector 430. The light beam for the second area picture is reflected through the long focal surface area to the reflector 430. The reflector 430 reflects the received light beam for the first area picture to the first curved reflective area 410-1 of the free-form primary mirror and reflects the received light beam for the second area picture to the second curved reflective area 410-2 of the free-form primary mirror. The free-form primary mirror 410 projects the light beam for the first area picture and received in the first curved reflective area 410-1 to the windshield and projects the light beam for the second area picture and received in the second curved reflective area 410-2 to the windshield. In the free-form primary mirror 410, the focal power in the first curved reflective area 410-1 is different from the focal power in the second curved reflective area 410-2. The light beam for the first area picture and the light beam for the second area picture are reflected to the human eye through the windshield. Finally, two images corresponding to the short focal surface and the long focal surface are presented to the human eye. The first area picture is displayed in the image on the short focal surface, and the second area picture is displayed in the image on the long focal surface.

[0121] Based on the above content and the same concept, the present application provides a position adjustment method for a virtual image. For details, please refer to the description of Fig. 26. The head-up display method can be applied to a HUD device according to any one of the above embodiments. As shown in Fig. 26, the head-up display method includes the following steps:

[0122] 2601: By using the PGU, emit a light beam to be projected onto a picture, where the picture to be projected includes a first area picture and a second area picture, such that the light beam for the first area picture passes through a first projection area of ​​the light assembly and the light beam for the second area picture passes through a second projection area of ​​the light assembly, and the focal power of a portion of the light assembly through which the light path of the light beam for the first area picture passes is different from the focal power of a portion of the light assembly through which the light path of the light beam for the second area picture passes.

[0123] 2602: Projecting a light beam for a first area picture through a first projection area of ​​the light assembly and projecting a light beam for a second area picture through a second projection area such that a virtual image corresponding to the first area picture and a virtual image corresponding to the second area picture are focused at different positions outside the windshield.

[0124] In various embodiments of the present application, unless otherwise stated or there is no logical conflict, the terms and / or descriptions in different embodiments are consistent and may be cross-referenced, and the technical features in different embodiments may be combined based on their internal logical relationships to form new embodiments.

[0125] In the embodiments of the present application, and / or describes an association relationship between related objects, and represents that three relationships may exist. For example, A and / or B may represent the following cases: only A exists, both A and B exist, and only B exists, where A and B may be singular or plural. In the textual description of the present application, the character " / " generally indicates an "or" relationship between related objects. In the formulas of the present application, the character " / " indicates a "division" relationship between related objects. Furthermore, in the present application, the term "for example" is used to represent giving an example, illustration, or explanation. Any embodiment or design scheme described as an "example" in the present application should not be described as being preferred or having more advantages than another embodiment or design scheme. Alternatively, it may be understood that the word "example" is used to present a concept in a particular manner and does not constitute a limitation on the present application.

[0126] It can be understood that in this application, various numbers are only distinguished for ease of description, and are not used to limit the scope of the embodiments of this application. The sequence numbers of the above processes do not imply an execution sequence, and the execution sequence of the processes should be determined based on the functions and internal logic of the processes. The terms "first", "second", etc. are used to distinguish between similar objects without the need to describe a specific order or sequence. Furthermore, the terms "comprise", "have", and any variations thereof shall cover a non-exclusive inclusion, for example, including a series of steps or units. For example, a method, system, product, or device is not necessarily limited to those steps or units explicitly listed, and may include other steps or units not explicitly listed or inherent to such a process, method, product, or device.

[0127] Although the present application has been described with reference to particular features and embodiments thereof, various modifications and combinations may be incorporated into the present application. ExampleIt is apparent that modifications may be made thereto without departing from the scope of the present invention. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the solutions defined by the appended claims, and any or all modifications, variations, combinations or equivalents are considered to cover the scope of this application.

[0128] It is obvious that those skilled in the art can make various modifications and changes to this application without departing from the scope of the present invention. In this case, this application is intended to cover these modifications and changes of the embodiments of this application, provided that these modifications and changes of this application fall within the scope of protection defined by the following claims and their equivalent technologies.

Claims

1. A head-up display device comprising a picture generation unit (PGU) and a light assembly, the PGU is configured to generate a light beam to be projected onto a picture, the picture to be projected comprising a first area picture and a second area picture; to emit a light beam for the first area picture such that the light beam for the first area picture passes through a first projection area of ​​the light assembly; and to emit a light beam for the second area picture such that the light beam for the second area picture passes through a second projection area of ​​the light assembly; An apparatus, wherein a focal power of a portion of the light assembly through which an optical path of the light beam for the first area picture passes is different from a focal power of a portion of the light assembly through which an optical path of the light beam for the second area picture passes.

2. 2. The apparatus of claim 1, further comprising a ghost removal assembly configured to adjust the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly such that the light beam for the first area picture and emitted through the first projection area of ​​the light assembly does not overlap with the light beam for the second area picture and emitted through the second projection area of ​​the light assembly.

3. the ghost reduction assembly comprises a first optical wedge and / or a second optical wedge; the first optical wedge is located between the PGU and an optical path of the first projection area, for the first area picture, and configured to adjust an emission direction of the light beam input to the first optical wedge; or 3. The apparatus of claim 2, wherein the second optical wedge is located between the PGU and an optical path of the second projection area, is for the second area picture, and is configured to adjust an emission direction of the light beam input to the second optical wedge.

4. the ghost elimination assembly comprises at least a first half-wave plate, a first film layer, and a second film layer, the first film layer being attached to the first projection area of ​​the light assembly, and the second film layer being attached to the second projection area of ​​the light assembly; the at least one first half-wave plate is located between the PGU and an optical path of the first projection area, and a polarization direction of the light beam for the first area picture adjusted by the at least one first half-wave plate is perpendicular to a polarization direction of the light beam for the second area picture projected by the PGU, and a polarization direction of the first film layer is perpendicular to a polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is perpendicular to a polarization direction of the second film layer; or 3. The apparatus of claim 2, wherein the at least one first half-wave plate is located between the PGU and an optical path of the second projection area, the polarization direction of the light beam for the second area picture adjusted by the at least one half-wave plate is perpendicular to the polarization direction of the light beam for the first area picture projected by the PGU, the polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is perpendicular to the polarization direction of the second film layer.

5. the PGU comprises a projector light engine and a diffuser, the projector light engine configured to generate the light beam to be projected onto the picture; the diffuser comprises a third projection area and a fourth projection area; 3. The apparatus of claim 2, wherein the diffuser is configured to uniformly project the light beam, which is for the first area picture and is received in the third projection area, onto the first projection area of ​​the light assembly, and to uniformly project the light beam, which is for the second area picture and is received in the fourth projection area, onto the second projection area of ​​the light assembly.

6. the anti-ghost assembly is disposed in the PGU, the anti-ghost assembly comprising a third optical wedge and / or a fourth optical wedge; the third optical wedge is located between the projector light engine and the light path of the third projection area, for the first area picture, and configured to adjust the emission direction of the light beam input to the third optical wedge; or 6. The apparatus of claim 5, wherein the fourth optical wedge is located between the projector light engine and an optical path of the fourth projection area, for the second area picture, and configured to adjust an emission direction of the light beam input to the fourth optical wedge.

7. the ghost elimination assembly comprises at least a second half-wave plate, a third film layer, and a fourth film layer, the first film layer being attached to the first projection area of ​​the light assembly, and the second film layer being attached to the second projection area of ​​the light assembly; the at least one second half-wave plate is located between the projector light engine and an optical path of the third projection area, and a polarization direction of the light beam for the first area picture adjusted by the at least one second half-wave plate is orthogonal to a polarization direction of the light beam for the second area picture projected by the projector light engine, and a polarization direction of the first film layer is orthogonal to a polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is orthogonal to a polarization direction of the second film layer; or 6. The apparatus of claim 5, wherein the at least one second half-wave plate is located between the projector light engine and an optical path of the first projection area, a polarization direction of the light beam for the second area picture adjusted by the at least one second half-wave plate is perpendicular to a polarization direction of the light beam for the first area picture projected by the projector light engine, a polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is perpendicular to a polarization direction of the second film layer.

8. the ghost elimination assembly includes a fourth reflector and a fifth reflector; the fourth reflector is configured to project the light beam generated by the projector light engine for the first area picture onto the first projection area of ​​the light mirror group; the fifth reflector is configured to project the light beam generated by the projector light engine onto the second projection area of ​​the light mirror group for the second area picture; 6. The apparatus of claim 5, wherein an angle of reflection of the fourth reflector is different from an angle of reflection of the fifth reflector.

9. 9. The apparatus of claim 1, wherein the optical assembly comprises a freeform primary mirror, the freeform primary mirror comprising the first projection area and the second projection area, and wherein in the freeform primary mirror a focal power in the first projection area is different from a focal power in the second projection area.

10. The head-up display device further includes a first reflector, 10. The apparatus of claim 9, wherein the first reflector is configured to perform a light path folding on the light beam for the first area picture projected by the PGU such that the light beam for the first area picture is reflected onto the first projection area of ​​the primary free-form mirror, and to perform a light path folding on the light beam for the second area picture projected by the PGU such that the light beam for the second area picture is reflected onto the second projection area of ​​the primary free-form mirror.

11. The head-up display device further comprises a windshield, and the optical assembly comprises a holographic optical element HOE thin film, the HOE thin film is attached to the windshield or the HOE thin film is located in an intermediate layer of the windshield, the HOE thin film comprises the first projection area and the second projection area, and in the HOE thin film, the focal power in the first projection area is different from the focal power in the second projection area. The device of any one of claims 1 to 8.

12. 9. The apparatus of claim 1, wherein the light assembly comprises a first lens group and a second lens group, the focal power of the first lens group being different from the focal power of the second lens group, the first lens group being located in the third projection area of ​​the light assembly, and the second lens group being located in the fourth projection area of ​​the light assembly.

13. the apparatus further comprises a second reflector and a third reflector; 13. The apparatus of claim 12, wherein the second reflector is configured to perform optical path folding on the light beam for the first area picture projected by the PGU, such that the light beam for the first area picture is reflected by the first lens group, transmitted by the first lens group, arrives at the third reflector, and is reflected by the third reflector to the windshield; and to perform optical path folding on the light beam for the second area picture projected by the PGU, such that the light beam for the second area picture is reflected by the second lens group, transmitted by the second transmission group, arrives at the third reflector, and is reflected by the third reflector to the windshield.

14. A vehicle comprising a head-up display device according to any one of claims 1 to 13.

15. A head-up display method, the head-up display method being implemented in a head-up display device, the head-up display device comprising a picture generation unit (PGU) and a light assembly, the head-up display method comprising: emitting a light beam to be projected onto a picture by using the PGU, the picture to be projected comprising the first area picture and the second area picture, such that the light beam for the first area picture passes through a first projection area of ​​the light assembly and the light beam for the second area picture passes through a second projection area of ​​the light assembly; Equipped with The method of claim 1, wherein a focal power of a portion of the light assembly through which an optical path of the light beam for the first area picture passes is different from a focal power of a portion of the light assembly through which an optical path of the light beam for the second area picture passes, such that a virtual image corresponding to the first area picture and a virtual image corresponding to the second area picture are focused at different positions outside a windshield.

16. The head-up display device further comprises a ghost elimination assembly, and the method further comprises:

16. The method of claim 15, further comprising adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly by using the ghost removal assembly such that the light beam for the first area picture and emitted through the first projection area of ​​the light assembly does not overlap with the light beam for the second area picture and emitted through the second projection area of ​​the light assembly.

17. The ghost removal assembly includes a first optical wedge and / or a second optical wedge, and the step of adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly by using the ghost removal assembly includes: the first optical wedge is located between the PGU and the light path of the first projection area, and adjusting an emission direction of the light beam emitted by the PGU for the first area picture by using the first optical wedge; or The second optical wedge is located between the PGU and the light path of the second projection area, and by using the second optical wedge, adjusting the emission direction of the light beam emitted by the PGU for the second area picture.

20. The method of claim 16, comprising:

18. the ghost elimination assembly comprises at least a first half-wave plate, a first film layer, and a second film layer, the first film layer being attached to the first projection area of ​​the light assembly, and the second film layer being attached to the second projection area of ​​the light assembly; The step of adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly by using the ghost removal assembly includes: the at least one first half-wave plate is located between the PGU and an optical path of the first projection area, and by using the at least one half-wave plate, adjusts a polarization direction of the light beam for the first area picture projected by the PGU to be orthogonal to a polarization direction of the light beam for the second area picture projected by the PGU, where the polarization direction of the first film layer is orthogonal to the polarization direction of the light beam for the first area picture projected by the PGU and the polarization direction of the first film layer is orthogonal to the polarization direction of the light beam for the first area picture projected by the PGU, or the at least one first half-wave plate is located between the PGU and an optical path of the first projection area, and by using the at least one half-wave plate, adjust a polarization direction of the light beam for the second area picture to be orthogonal to a polarization direction of the light beam for the first area picture projected by the PGU, wherein a polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the PGU, and the polarization direction of the first film layer is orthogonal to a polarization direction of the second film layer.

20. The method of claim 16, comprising:

19. the PGU comprises a projector light engine and a diffuser, the projector light engine configured to generate the light beam to be projected onto the picture, the diffuser comprising a third projection area and a fourth projection area; The method comprises: uniformly projecting the light beam for the first area picture and received in the third projection area by using the diffuser on the first projection area of ​​the light assembly; and uniformly projecting the light beam for the second area picture and received in the fourth projection area on the second projection area of ​​the light assembly.

20. The method of claim 16 further comprising:

20. the ghost reduction assembly is disposed in the PGU, the ghost reduction assembly comprising a third optical wedge and / or a fourth optical wedge; The step of adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly by using the ghost removal assembly includes: the third optical wedge is located between the projector light engine and the light path of the third projection area, and by using the third optical wedge, adjusting the emission direction of the light beam emitted by the projector optical wedge for the first area picture; or the fourth optical wedge is located between the projector light engine and a light path of the fourth projection area, and adjusting an emission direction of the light beam emitted by the projector light engine for the second area picture by using the fourth optical wedge.

20. The method of claim 19 comprising:

21. the ghost elimination assembly comprises at least a second half-wave plate, a third film layer, and a fourth film layer, the first film layer being attached to the first projection area of ​​the light assembly, and the second film layer being attached to the second projection area of ​​the light assembly; The step of adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly by using the ghost removal assembly includes: the at least one second half-wave plate is located between the projector light engine and an optical path of the third projection area, and by using the at least one second half-wave plate, adjust a polarization direction of the light beam for the first area picture to be orthogonal to a polarization direction of the light beam for the second area picture projected by the projector light engine, where the polarization direction of the first film layer is orthogonal to a polarization direction of the light beam for the first area picture projected by the projector light engine and the polarization direction of the first film layer is orthogonal to a polarization direction of the second film layer; or the at least one second half-wave plate is located between the projector light engine and a light path of the first projection area, and by using the at least one second half-wave plate, adjust a polarization direction of the light beam for the second area picture to be orthogonal to a polarization direction of the light beam for the first area picture projected by the projector light engine, wherein a polarization direction of the first film layer is the same as the polarization direction of the light beam for the first area picture projected by the projector light engine, and the polarization direction of the first film layer is orthogonal to a polarization direction of the second film layer.

20. The method of claim 19 comprising:

22. the ghost elimination assembly includes a fourth reflector and a fifth reflector; The step of adjusting the light beam for the first area picture and / or the light beam for the second area picture input to the ghost removal assembly by using the ghost removal assembly includes: projecting the light beam generated by the projector light engine for the first area picture by using the fourth reflector on the first projection area of ​​the light mirror group; projecting the light beam generated by the projector light engine for the second area picture by using the fifth reflector on the second projection area of ​​the light mirror group; Equipped with 20. The method of claim 19, wherein an angle of reflection of the fourth reflector is different from an angle of reflection of the fifth reflector.

23. 23. The method of any one of claims 15 to 22, wherein the optical assembly comprises a freeform primary mirror, the freeform primary mirror comprising the first projection area and the second projection area, and in the freeform primary mirror a focal power in the first projection area is different from a focal power in the second projection area.

24. The head-up display device further includes a first reflector, The method comprises:

24. The method of claim 23, further comprising: performing optical path folding on the light beam for the first area picture projected by the PGU such that the light beam for the first area picture is reflected to the first projection area of ​​the free-form primary mirror by using the first reflector; and performing optical path folding on the light beam for the second area picture projected by the PGU such that the light beam for the second area picture is reflected to the second projection area of ​​the free-form primary mirror.

25. 23. The method of any one of claims 15 to 22, wherein the head-up display device further comprises a windshield, and the optical assembly comprises a holographic optical element HOE thin film, the HOE thin film is attached to the windshield or the HOE thin film is located in an intermediate layer of the windshield, the HOE thin film comprises the first projection area and the second projection area, and in the HOE thin film, a focal power in the first projection area is different from a focal power in the second projection area.

26. 23. The method of any one of claims 15 to 22, wherein the light assembly comprises a first lens group and a second lens group, a focal power of the first lens group being different from a focal power of the second lens group, the first lens group being located in the third projection area of ​​the light assembly, and the second lens group being located in the fourth projection area of ​​the light assembly.

27. the apparatus further comprises a second reflector and a third reflector; The method comprises:

27. The method of claim 26, further comprising: performing optical path folding on the light beam for the first area picture projected by the PGU, such that by using the second reflector, the light beam for the first area picture is reflected to the first lens group, transmitted by the first lens group, arrives at the third reflector, and is reflected by the third reflector to the windshield; and performing optical path folding on the light beam for the second area picture projected by the PGU, such that the light beam for the second area picture is reflected to the second lens group, transmitted by the second transmission group, arrives at the third reflector, and is reflected by the third reflector to the windshield.

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