Head-up display device, design method therefor, and vehicle

Abstract

The embodiment of the present application provides a head-up display device, a design method thereof and a carrier, and relates to the technical field of head-up display.The head-up display device provided by the embodiment of the present application comprises: an image source, which is used for generating left-eye image light beams and right-eye image light beams; a cylindrical grating, which is located on the propagation path of the left-eye image light beams and the right-eye image light beams, and is used for splitting and projecting the left-eye image light beams and the right-eye image light beams; the cylindrical grating comprises at least two cylindrical grating subareas, and each cylindrical grating subarea comprises at least two cylindrical lenses; and a light shielding member, wherein the at least two cylindrical lens subareas comprise a first cylindrical grating subarea and a second cylindrical grating subarea, and the light shielding member is located in the first cylindrical grating subarea among the first cylindrical grating subarea and the second cylindrical grating subarea.The head-up display device provided by the embodiment of the present application reduces the crosstalk problem of the head-up display device, and simultaneously reduces the problem of resolution reduction caused by shielding light.

Description

Technical Field

[0001] The present invention relates to the field of head-up display technology, and in particular to a head-up display device, a design method thereof, and a carrier thereof. Background Art

[0002] With the popularization of automobiles, they are becoming more and more intelligent. In order to improve driving safety and make drivers focus more on the road, more and more vehicles use head-up displays (HUDs) instead of instrument panels to display driving information. With the development of head-up displays, different types of HUDs have emerged, among which AR-HUD has been widely used.

[0003] Common AR-HUDs use specialized lenticular gratings to achieve light splitting, allowing the left and right eyes to see different images, which are then merged into a 3D image in the user's brain. However, these lenticular gratings are prone to crosstalk, causing the left and right eye images to overlap. Summary of the Invention

[0004] Embodiments of the present invention provide a head-up display device, a design method thereof, and a vehicle thereof, so as to alleviate the crosstalk problem and the problem of resolution degradation caused by light obstruction.

[0005] In one aspect, an embodiment of the present invention provides a head-up display device comprising:

[0006] An image source, the image source is used to generate a left-eye image beam and a right-eye image beam;

[0007] A lenticular grating is located on the propagation paths of the left-eye image beam and the right-eye image beam, and is used to split and project the left-eye image beam and the right-eye image beam; the lenticular grating includes at least two lenticular sub-regions, each of which includes at least two cylindrical lenses;

[0008] The light shielding member includes at least two cylindrical lens sub-regions including a first cylindrical lens sub-region and a second cylindrical lens sub-region. In both the first cylindrical lens sub-region and the second cylindrical lens sub-region, the light shielding member is located in the first cylindrical lens sub-region.

[0009] Optionally, the shading member and the cylindrical lens extend in the same direction.

[0010] Optionally, the light shield is located between the image source and the lenticular lens;

[0011] Alternatively, the light shield is located on the side of the lenticular lens facing away from the image source.

[0012] Optionally, the plurality of cylindrical lenses are arranged along the first direction;

[0013] The cylindrical lens includes a central region and an edge region, wherein the geometric center of the cylindrical lens is located in the central region, and along the first direction, the edge region is located outside the central region;

[0014] The light shielding member covers the edge region in a direction perpendicular to the plane in which the cylindrical lens array is located.

[0015] Optionally, in the first cylindrical lens sub-region, the plurality of light shielding members are periodically arranged.

[0016] Optionally, the edge region comprises a first edge region and a second edge region, and the first edge region and the second edge region are located on two sides of the central region in the same cylindrical lens.

[0017] In the first cylindrical lens sub-region, the light shielding member covers the first edge region.

[0018] Alternatively, in the first cylindrical lens sub-region, the light shielding member covers the second edge region.

[0019] Optionally, the edge region comprises a first edge region and a second edge region, and the first edge region and the second edge region are located on two sides of the central region in the same cylindrical lens.

[0020] In the first cylindrical lens sub-region, the same light shielding member covers the first edge region and the second edge region of the adjacent cylindrical lens.

[0021] Optionally, the first edge region and the second edge region have different widths in the first direction.

[0022] Optionally, the image source comprises a plurality of sub-pixels.

[0023] The width of the light shielding member is less than or equal to the width of the sub-pixel in the first direction.

[0024] Optionally, the width of the cylindrical lens is greater than or equal to 100 μm and less than or equal to 300 μm in the first direction.

[0025] Optionally, in the first cylindrical lens sub-region, the plurality of light shielding members have the same width in the first direction.

[0026] Optionally, in the first cylindrical lens sub-region, there are at least two light shielding members having different widths in the first direction.

[0027] Optionally, the head-up display device further comprises a curved mirror, and the curved mirror is located on the propagation path of the split left-eye image beam and right-eye image beam.

[0028] In another aspect, an embodiment of the present application provides a vehicle comprising the head-up display device of the first aspect and a windshield.

[0029] In another aspect, the present application provides a design method of a head-up display device, the head-up display device comprising an image source, a lenticular lens and a light shielding member; the image source is configured to generate a left-eye image light beam and a right-eye image light beam; the lenticular lens is located on a propagation path of the left-eye image light beam and the right-eye image light beam, and is configured to split and project the left-eye image light beam and the right-eye image light beam;

[0030] The design method comprises:

[0031] obtaining a plurality of crosstalk regions of light rays on the lenticular lens;

[0032] dividing the lenticular lens into at least two lenticular sub-zones according to the plurality of crosstalk regions of light rays, the lenticular sub-zones comprising at least two lenticules, the at least two lenticular sub-zones comprising a first lenticular sub-zone and a second lenticular sub-zone; wherein the first lenticular sub-zone comprises the crosstalk region of light rays;

[0033] setting the light shielding member in the first lenticular sub-zone.

[0034] Optionally, the plurality of lenticules are arranged along a first direction;

[0035] After obtaining the plurality of crosstalk regions of light rays on the lenticular lens, the design method further comprises:

[0036] obtaining a width of the plurality of crosstalk regions of light rays along the first direction;

[0037] obtaining a width of the light shielding member corresponding to the crosstalk region of light rays along the first direction according to the width of the plurality of crosstalk regions of light rays along the first direction.

[0038] Optionally, the width of the light shielding member along the first direction is greater than or equal to a minimum crosstalk region width and less than or equal to a maximum crosstalk region width;

[0039] wherein the minimum crosstalk region width is a minimum width of the plurality of crosstalk regions of light rays along the first direction, and the maximum crosstalk region width is a maximum width of the plurality of crosstalk regions of light rays along the first direction.

[0040] Optionally, obtaining the width of the plurality of crosstalk regions of light rays along the first direction comprises:

[0041] obtaining a distribution of the density of stray light of the plurality of crosstalk regions of light rays;

[0042] obtaining the width of the crosstalk region of light rays along the first direction according to the distribution of the density of stray light.

[0043] Optionally, obtaining the width of the light shielding member corresponding to the crosstalk region of light rays along the first direction according to the width of the plurality of crosstalk regions of light rays along the first direction comprises:

[0044] determining whether the width of the crosstalk region of light rays along the first direction is greater than a threshold value;

[0045] When the width of the light ray crosstalk region along the first direction is greater than a threshold, the width of the light shield along the first direction is set as a first width, and when the width of the light ray crosstalk region along the first direction is less than or equal to the threshold, the width of the light shield along the first direction is set as a second width; the first width is greater than the second width.

[0046] Optionally, the plurality of light ray crosstalk regions on the lenticular lens are obtained, including:

[0047] Only the light rays on the receiving surface are reserved;

[0048] The light rays on the receiving surface are traced back to the lenticular lens to find the distribution of the crosstalk light rays on the lenticular lens;

[0049] According to the distribution of the crosstalk light rays on the lenticular lens, the plurality of light ray crosstalk regions on the lenticular lens are obtained.

[0050] The head-up display provided by the embodiment of the application reduces the crosstalk problem of the head-up display by setting the light shield only in the first lenticular lens subarea outputting the crosstalk light rays to shield the light rays causing the crosstalk problem; meanwhile, since the light shield does not shield the second lenticular lens subarea outputting normal images, the resolution reduction problem of the head-up display caused by the shielded output light rays is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a structural schematic diagram of a head-up display provided by the embodiment of the application;

[0052] Figure 2 is a structural schematic diagram of a lenticular lens and a light shield provided by the embodiment of the application;

[0053] Figure 3 is a structural schematic diagram of another lenticular lens and a light shield provided by the embodiment of the application

[0054] Figure 4 is a structural schematic diagram of a lenticular lens and a light shield provided by the embodiment of the application;

[0055] Figure 5 is a structural schematic diagram of another head-up display provided by the embodiment of the application;

[0056] Figure 6 is a structural schematic diagram of still another head-up display provided by the embodiment of the application;

[0057] Figure 7 is a structural schematic diagram of still another head-up display provided by the embodiment of the application;

[0058] Figure 8is a structural schematic diagram of another head-up display device provided by an embodiment of the present application;

[0059] Figure 9 is a structural schematic diagram of another head-up display device provided by an embodiment of the present application;

[0060] Figure 10 is a structural schematic diagram of a carrier provided by an embodiment of the present application;

[0061] Figure 11 is a flowchart of a design method of a head-up display device provided by an embodiment of the present application;

[0062] Figure 12 is a flowchart of a design method of another head-up display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0063] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0064] It is found that the crosstalk problem mainly occurs at the arc edges of the cylindrical lenses in the cylindrical lens grating. To eliminate the crosstalk, one approach is to block the arc edges of the cylindrical lenses by blackening. However, this approach blocks the areas without crosstalk as well as the crosstalk light, which will result in a decrease in the resolution of the head-up display device. The conventional understanding is based on the cylindrical lens grating commonly applied in stereoscopic display devices, and all the arc edges of the cylindrical lenses are usually blocked by blackening. It is found that the head-up display device has a non-uniform effect on imaging, i.e., the imaging light path causes an increase in crosstalk in some areas and a disappearance of crosstalk in some areas.

[0065] Figure 1 is a structural schematic diagram of a head-up display device provided by an embodiment of the present application, referring to Figure 1 The present embodiment provides a head-up display device, which comprises an image source 1, a cylindrical lens grating 2 and a light-blocking member 3. The image source 1 is configured to generate left-eye image light beams and right-eye image light beams. The cylindrical lens grating 2 is located on the propagation paths of the left-eye image light beams and the right-eye image light beams, and is configured to split and project the left-eye image light beams and the right-eye image light beams. The cylindrical lens grating 2 is a splitting element, which deflects the left-eye image light beams and the right-eye image light beams towards different directions to project the left-eye image light beams to the left eye and the right-eye image light beams to the right eye. The cylindrical lens grating 2 comprises at least two cylindrical lens sub-zones 20, Figure 2is a structural schematic diagram of a cylindrical lens grating and a light shielding piece provided by an embodiment of the present application, wherein the first direction x is the arrangement direction of the cylindrical lenses, and the second direction y is the extension direction of the cylindrical lenses, Figure 2 The two cylindrical lens partitions 20 are taken as examples, and the present application is not limited thereto. In other embodiments, the cylindrical lens grating 2 can also be provided with other numbers of cylindrical lens partitions 20.

[0066] Figure 3 is another structural schematic diagram of a cylindrical lens grating and a light shielding piece provided by an embodiment of the present application, taken as an example, Figure 3 Figure 3 The cylindrical lens grating 2 includes three cylindrical lens partitions 20. The cylindrical lens partition 20 includes at least two cylindrical lenses 4. The present application is not limited to the number of cylindrical lenses 4 included in one cylindrical lens partition 20. The at least two cylindrical lens partitions 20 include a first cylindrical lens partition 21, a second cylindrical lens partition 22 and a third cylindrical lens partition 23. The light shielding piece 3 is arranged in the first cylindrical lens partition 21 and the third cylindrical lens partition 23, and the second cylindrical lens partition 22 is not provided with the light shielding piece 3. The light shielding pieces 3 in the first cylindrical lens partition 21 and the third cylindrical lens partition 23 can have the same arrangement mode, or different arrangement modes. The light shielding pieces 3 in the first cylindrical lens partition 21 and the third cylindrical lens partition 23 can have the same width, or different widths.

[0067] Among the first cylindrical lens partition 21 and the second cylindrical lens partition 22, the light shielding piece 3 is located in the first cylindrical lens partition 21. The light shielding piece 3 is arranged in the first cylindrical lens partition 21 to shield the cylindrical lenses 4 in the first cylindrical lens partition 21 and shield the crosstalk light in the first cylindrical lens partition 21. The light shielding piece 3 is not arranged in the second cylindrical lens partition 22, and the light shielding piece 3 does not shield the cylindrical lenses 4 in the second cylindrical lens partition 22. There can be a small amount of crosstalk light in the second cylindrical lens partition 22, or there can be no crosstalk light, so that the light shielding piece 3 is not required to be arranged, and at least the resolution of the second cylindrical lens partition 22 is improved, thereby improving the resolution of the head-up display device.

[0068] Among the first cylindrical lens partition 21 and the second cylindrical lens partition 22, the light shielding piece 3 is located in the first cylindrical lens partition 21. The light shielding piece 3 is arranged in the first cylindrical lens partition 21 to shield the cylindrical lenses 4 in the first cylindrical lens partition 21 and shield the crosstalk light in the first cylindrical lens partition 21. The light shielding piece 3 is not arranged in the second cylindrical lens partition 22, and the light shielding piece 3 does not shield the cylindrical lenses 4 in the second cylindrical lens partition 22. There can be a small amount of crosstalk light in the second cylindrical lens partition 22, or there can be no crosstalk light, so that the light shielding piece 3 is not required to be arranged, and at least the resolution of the second cylindrical lens partition 22 is improved, thereby improving the resolution of the head-up display device.

[0069] ​The first lenticular sub-area 21 is an area with crosstalk problems, and the second lenticular sub-area 22 is an area without crosstalk problems. The first lenticular sub-area 21 and the second lenticular sub-area 22 can be determined by a reverse tracing method: first, the image output by the head-up display device is received by the receiver, and the positions of the crosstalk light rays in the image received by the receiver are determined; then, according to the positions of the crosstalk light rays, the corresponding distribution of the crosstalk light rays on the surface of the lenticular grating 2 is obtained by reverse tracing the light ray path, and the area on the surface of the lenticular grating 2 where the crosstalk light rays are output is the first lenticular sub-area 21. It can be understood that, in the first lenticular sub-area 21, there are positions where crosstalk light rays exist and positions where crosstalk light rays do not exist.

[0070] By arranging the light shielding member 3 in the first lenticular sub-area 21, the light rays that cause crosstalk problems can be shielded, thereby reducing or even eliminating the crosstalk problems. The reason for arranging the light shielding member 3 only in the first lenticular sub-area 21 is that, if the light shielding member 3 is arranged in the second lenticular sub-area 22 without or with a small amount of crosstalk problems, the light transmission area of the lenticular lens 4 will be reduced, thereby reducing the resolution of the head-up display device and affecting the imaging quality. However, if the light shielding member 3 is arranged only in the first lenticular sub-area 21, the crosstalk light rays can be accurately shielded without affecting the light transmission area of the lenticular lens 4 in the second lenticular sub-area 22, thereby reducing the impact of the resolution of the head-up display device and improving the quality of the image output by the head-up display device while eliminating the crosstalk problems.

[0071] The head-up display device provided by the embodiment of the present application can reduce the crosstalk problems of the head-up display device by arranging the light shielding member 3 only in the first lenticular sub-area 21 where the crosstalk light rays are output, thereby reducing the crosstalk problems. At the same time, since the light shielding member 3 does not shield the second lenticular sub-area 22 where normal images are output, the resolution of the head-up display device is not reduced due to the shielding of the output light rays.

[0072] Figure 4 is a structural schematic diagram of the lenticular grating and the light shielding member provided by the embodiment of the present application, referring to Figure 4 The extension direction of the light shielding member 3 is the same as that of the lenticular lens 4. The lenticular grating 2 includes a plurality of lenticular lenses 4 arranged periodically in the same direction, and the extension direction of the lenticular lens 4 is perpendicular to the periodic arrangement direction of the lenticular lens 4. Therefore, the gap direction between the lenticular lenses 4 is consistent with the extension direction of the lenticular lens 4. In order to shield the crosstalk light rays emitted from the gap between the lenticular lenses 4 in the first lenticular sub-area 21, the light shielding member 3 also needs to be arranged in the extension direction of the lenticular lens 4 to shield the crosstalk light rays. It should be noted that the gap between the lenticular lenses 4 is caused by the manufacturing process, and there is no gap between the lenticular lenses 4 in the design stage before manufacturing. In some embodiments, the extension direction of the light shielding member 3 can be different from that of the lenticular lens 4, and there is a small included angle therebetween.

[0073] Optionally, referring to Figure 1 , the light shielding member 3 is located on the side of the cylindrical lens grating 2 away from the image source 1. In the manufacturing process, for example, a black coating layer can be filled on the upper surface of the cylindrical lens grating 2 after the cylindrical lens grating 2 is attached to the substrate (not shown in the figure). The black coating layer includes the light shielding member 3. Figure 1

[0074] Figure 5 is another structure diagram of the head-up display provided by the embodiment of the present application, as Figure 5 shown, the light shielding member 3 is located between the image source 1 and the cylindrical lens grating 2. This setting position can also play a role in shielding the crosstalk light. The specific setting position of the light shielding member 3 can be selected according to the actual application needs. In the manufacturing process, for example, the black coating layer is first attached to the substrate 300, and then the cylindrical lens grating 2 is attached to the black coating layer (i.e. the light shielding member 3).

[0075] Figure 6 is another structure diagram of the head-up display provided by the embodiment of the present application, referring to Figure 6 , a plurality of cylindrical lenses 4 are arranged along the first direction x. The cylindrical lens 4 includes a central region 41 and an edge region 40, and the geometric center of the cylindrical lens 4 is located in the central region 41. Along the first direction x, the edge region 40 is located on the periphery of the central region 41. Perpendicular to the direction of the plane where the cylindrical lens grating 2 is located, the light shielding member 3 covers the edge region 40 of the cylindrical lens 4.

[0076] Referring to Figure 6 , a plurality of cylindrical lenses 4 are arranged along the first direction x, and the edge regions 40 of the cylindrical lenses 4 abut together. There may be a gap between the edge regions 40 of the adjacent two cylindrical lenses 4, and the light passing through the gap will cause crosstalk problem. Therefore, the light shielding member 3 needs to cover the edge region 40 of the first cylindrical lens sub-area to shield the crosstalk light. At the same time, since the light emitted by the image source 1 is incident on the cylindrical lens grating 2 in the direction perpendicular to the plane where the cylindrical lens grating 2 is located, and is also emitted in the direction perpendicular to the plane where the cylindrical lens grating 2 is located, the light shielding member 3 needs to cover the edge region 40 in the direction perpendicular to the plane where the cylindrical lens grating 2 is located. In the manufacturing process, after the cylindrical lens grating 2 is attached to the substrate (not shown in the figure), the upper surface of the cylindrical lens grating 2 can be filled with a filling layer 50, and a black coating layer (i.e. the light shielding member 3) is attached to the surface of the filling layer 50 away from the cylindrical lens grating 2. Figure 6

[0077] Optionally, in the first cylindrical lens sub-area, a plurality of light shielding members are periodically arranged.

[0078] Referring to Figure 6 ​​In the cylindrical grating 2, multiple cylindrical lenses 4 are periodically arranged along the first direction x. In the first cylindrical partition, there are gaps between the cylindrical lenses 4. Since the cylindrical lenses 4 are periodically arranged along the first direction x, the gaps between the cylindrical lenses 4 are also periodically distributed. Therefore, as long as the shading element 3 is set according to the distribution period of the gaps between the cylindrical lenses 4, the shading element 3 can block the crosstalk light that passes through the gaps between the cylindrical lenses 4.

[0079] Based on the above embodiment, optionally, the edge region 40 includes a first edge region 42 and a second edge region 43. Within the same cylindrical lens 4, the first edge region 42 and the second edge region 43 are located on either side of the central region 41. Within the first cylindrical lens subregion, the light shielding member 3 covers the first edge region 42. Alternatively, within the first cylindrical lens subregion, the light shielding member 3 covers the second edge region 43. Optionally, the edge region 40 includes the first edge region 42 and the second edge region 43. Within the same cylindrical lens 4, the first edge region 42 and the second edge region 43 are located on either side of the central region 41. Within the first cylindrical lens subregion, the same light shielding member 3 covers the first edge region 42 and the second edge region 43 of adjacent cylindrical lenses 4. Optionally, along the first direction x, the first edge region 42 and the second edge region 43 have different widths.

[0080] Figure 7 is a structural diagram of another head-up display device provided by an embodiment of the present invention. Figure 8 is a structural diagram of another head-up display device provided by an embodiment of the present invention. Figure 9 This is a structural diagram of another head-up display device provided by an embodiment of the present invention, combined with Figure 7 、 Figure 8 and Figure 9 As shown, the light shielding member 3 may cover only the first edge region 42 or only the second edge region 43. The light shielding member 3 may also cover both the first edge region 42 and the second edge region 43 of the adjacent cylindrical lens 4. This embodiment does not impose any specific restrictions on the covering position of the light shielding member 3 and the sizes of the first edge region 42 and the second edge region 43.

[0081] Based on the above embodiment, the image source 1 includes multiple sub-pixels; along the first direction x, the width of the light shielding member 3 is less than or equal to the width of the sub-pixel. If the width of the light shielding member 3 in the first direction x exceeds the width of the sub-pixel, the light shielding member 3 will completely block light emitted by certain sub-pixels of the image source 1, resulting in the loss of some pixels in the image viewed by the user and a reduction in image resolution. Therefore, to ensure the quality of the image output by the head-up display device, the width of the light shielding member 3 along the first direction x should not exceed the width of the sub-pixel.

[0082] On the basis of the above-mentioned embodiments, the width of the cylindrical lens 4 along the first direction x is greater than or equal to 100 μm and less than or equal to 300 μm.

[0083] Optionally, in the first cylindrical lens sub-area, the plurality of light-blocking pieces 3 have the same width along the first direction x. The same width of the light-blocking piece 3 has low difficulty in design and manufacture, and the use of the light-blocking piece 3 with the same width in the first cylindrical lens sub-area can reduce the design cost and the manufacturing difficulty while alleviating the crosstalk problem.

[0084] Optionally, in the first cylindrical lens sub-area, there are at least two light-blocking pieces 3 with different widths along the first direction x. The width of the light-blocking piece 3 along the first direction x can be flexibly set according to the width of the gap between the corresponding adjacent cylindrical lenses 4, and for the gap between the cylindrical lenses 4 with different widths along the first direction x, the light-blocking piece 3 with different widths along the first direction x can be set to reduce the influence of the light-blocking piece 3 on the resolution of the head-up display device.

[0085] On the basis of the above-mentioned embodiments, the head-up display device further comprises a curved mirror, and the curved mirror is located on the propagation path of the split left-eye image light beam and the right-eye image light beam.

[0086] The curved mirror can reflect the split left-eye image light beam and the right-eye image light beam to the windshield glass of the vehicle, and the windshield glass can reflect the left-eye image light beam and the right-eye image light beam into the eyebox. At the same time, the curved mirror has a converging effect on light, which can prevent the split left-eye image light beam and the right-eye image light beam from diverging. The eyebox refers to the eye distribution range in which the driver side can see a complete image.

[0087] Based on the same inventive concept, the embodiments of the present application provide a vehicle comprising the head-up display device provided by any of the embodiments of the present application and a windshield.

[0088] Figure 10 is a structural schematic diagram of a vehicle provided by an embodiment of the present application, referring to Figure 10 , the image source 1 outputs image light, the image light propagates to the light-blocking piece 3 after passing through the cylindrical lens grating 2, the light-blocking piece 3 can block the crosstalk light in the image light, then the image light is incident on the curved mirror 5, the curved mirror 5 reflects the image light to the windshield glass 6 of the vehicle, the windshield glass 6 reflects the image light into the eyebox 8, and the human eye observing the image light will see a virtual image 7.

[0089] The curved mirror 5 and / or the windshield glass 6 is a free-form surface, and the influence on the light path is non-uniform, and the plane where the image source 1 is located is not perpendicular to the main optical axis in the design process, and thus the symmetry is destroyed. Therefore, the head-up display device has a non-uniform influence on imaging, that is, the imaging light path causes some areas to have increased crosstalk and some areas to have disappeared crosstalk.

[0090] Based on the same inventive concept, the embodiment of the present application provides a design method of a head-up display device, the head-up display device comprising an image source 1, a cylindrical lens grating 2 and a light shielding member 3; the image source 1 is used to generate left-eye image light beams and right-eye image light beams; the cylindrical lens grating 2 is located on the propagation path of the left-eye image light beams and the right-eye image light beams, and is used to split and project the left-eye image light beams and the right-eye image light beams. Figure 11 Figure 11 The design method of the head-up display device comprises the following steps:

[0091] S101, obtaining a plurality of light ray crosstalk areas on the cylindrical lens grating.

[0092] Optionally, the step of obtaining the plurality of light ray crosstalk areas on the cylindrical lens grating comprises: only retaining the light rays on the receiving surface; tracing back the light rays on the receiving surface to the cylindrical lens grating to find the distribution of the crosstalk light rays on the cylindrical lens grating; and obtaining the plurality of light ray crosstalk areas on the cylindrical lens grating according to the distribution of the crosstalk light rays on the cylindrical lens grating.

[0093] Specifically, the receiving surface refers to the plane where the eyebox is located, and the light rays on the receiving surface represent the light rays seen by the user during use of the head-up display device. Then, the crosstalk light rays among the light rays on the receiving surface are determined, and the light path of the crosstalk light rays on the receiving surface is traced back in reverse to find the distribution of the crosstalk light rays on the cylindrical lens grating. Finally, the plurality of light ray crosstalk areas on the cylindrical lens grating are obtained according to the distribution of the crosstalk light rays on the cylindrical lens grating.

[0094] S102, dividing the cylindrical lens grating into at least two cylindrical lens sub-zones according to the plurality of light ray crosstalk areas, the cylindrical lens sub-zones comprising at least two cylindrical lenses, and the at least two cylindrical lens sub-zones comprising a first cylindrical lens sub-zone and a second cylindrical lens sub-zone; wherein the first cylindrical lens sub-zone comprises the light ray crosstalk area.

[0095] If the light shielding member 3 is arranged on the cylindrical lens grating 2 without distinction, the light rays emitted from the areas without crosstalk problems will also be blocked, and thus the resolution of the head-up display device is reduced, affecting the imaging quality. By distinguishing the light ray crosstalk areas and the non-light ray crosstalk areas, the influence of the light shielding member 3 on the resolution can be reduced, and the imaging quality is improved while reducing the crosstalk phenomenon.

[0096] S103, arranging the light shielding member in the first cylindrical lens sub-zone. ​

[0097] The light shielding piece 3 is arranged in the first lenticular sub-area to shield the light output by the first lenticular sub-area to eliminate the light that causes the crosstalk problem. The reason for arranging the light shielding piece only in the first lenticular sub-area is that if the light shielding piece 3 is arranged in the second lenticular sub-area without the crosstalk problem, the light transmission area of the lenticular lens will be greatly reduced, thereby greatly reducing the resolution of the head-up display device and affecting the imaging quality. However, if the light shielding piece 3 is arranged only in the first lenticular sub-area, the light that causes the crosstalk problem is precisely shielded, and the light transmission area of the lenticular lens in the second lenticular sub-area is not affected, so that the crosstalk problem is eliminated, and the resolution of the head-up display device is less affected, and the quality of the image output by the head-up display is improved.

[0098] The design method of the head-up display device provided in the embodiment of the present application can shield the light that causes the crosstalk problem by arranging the light shielding piece only in the first lenticular sub-area where the crosstalk light is output, thereby reducing the crosstalk problem of the head-up display device. Meanwhile, since the light shielding piece does not shield the second lenticular sub-area where the normal image is output, the resolution of the head-up display device is less affected due to the shielding of the output light.

[0099] Figure 12 is a flowchart of another design method of a head-up display device provided in the embodiment of the present application, wherein the head-up display device includes a plurality of lenticular lenses 4 arranged along a first direction x, and the design method of the head-up display device includes Figure 12 , and the design method of the head-up display device includes

[0100] S201, acquiring a plurality of crosstalk areas of light rays on a lenticular grating.

[0101] S202, acquiring the width of the plurality of crosstalk areas of light rays along the first direction.

[0102] Optionally, the width of the plurality of crosstalk areas of light rays along the first direction includes: acquiring the distribution of the density of stray light of the plurality of crosstalk areas of light rays; and acquiring the width of the crosstalk area of light rays along the first direction according to the distribution of the density of stray light.

[0103] Specifically, the intensity of the stray light in the crosstalk area of light rays is not uniformly distributed, the intensity of the stray light in part of the crosstalk area of light rays is relatively large, and the distribution density of the stray light is relatively large; the intensity of the stray light in part of the crosstalk area of light rays is relatively small, and the distribution density of the stray light is relatively small. A stray light density threshold value can be set in advance, and the width of the area where the density of the stray light is greater than the stray light density threshold value along the first direction x is the width of the crosstalk area of light rays along the first direction x.

[0104] S203, acquiring the width of the light shielding piece corresponding to the crosstalk area of light rays along the first direction according to the width of the plurality of crosstalk areas of light rays along the first direction.

[0105] The light shielding piece 3 is too small to eliminate the crosstalk problem, and the light shielding piece 3 is too large to make the resolution of the head-up display device too low. Therefore, the width of the light shielding piece 3 along the first direction x needs to be set according to the width of the light ray crosstalk area along the first direction x, so as to eliminate the crosstalk problem while improving the resolution of the head-up display device. Alternatively, the width of the light shielding piece 3 along the first direction x is greater than or equal to the minimum crosstalk area width and less than or equal to the maximum crosstalk area width; wherein the minimum crosstalk area width is the minimum width of the plurality of light ray crosstalk areas along the first direction x, and the maximum crosstalk area width is the maximum width of the plurality of light ray crosstalk areas along the first direction x.

[0106] Alternatively, according to the width of the plurality of light ray crosstalk areas along the first direction x, the width of the light shielding piece 3 along the first direction corresponding to the light ray crosstalk area is obtained, comprising: judging whether the width of the light ray crosstalk area along the first direction x is greater than a threshold value; when the width of the light ray crosstalk area along the first direction x is greater than the threshold value, the width of the light shielding piece 3 along the first direction x is set to a first width, and when the width of the light ray crosstalk area along the first direction x is less than or equal to the threshold value, the width of the light shielding piece 3 along the first direction x is set to a second width; the first width is greater than the second width.

[0107] The threshold value is a length set in advance, which is used to judge whether the light shielding piece 3 with the second width can better eliminate the crosstalk problem of the fiber crosstalk area. If the width of the light ray crosstalk area along the first direction x is less than the threshold value, then setting the width of the light shielding piece 3 along the first direction x to the second width can better shield the crosstalk light rays emitted by this light ray crosstalk area; if the width of the light ray crosstalk area along the first direction x is greater than the threshold value, then the light shielding piece 3 with the width of the second width along the first direction x is not enough to shield the crosstalk light rays emitted by this light ray crosstalk area, and the width of the light shielding piece 3 along the first direction x needs to be set to the first width, and the first width is greater than the second width. The larger light shielding piece 3 can better eliminate the crosstalk problem, but at the same time, the resolution of the head-up display device will be lowered more. Therefore, the size of the threshold value can be selected according to actual needs. If a head-up display device with lower crosstalk is needed, the threshold value can be set to a smaller value, so that the width of the light shielding piece 3 along the first direction x is more set to the first width, better eliminating the crosstalk problem, but the resolution of the head-up display device will be relatively low; if a head-up display device with higher resolution is needed, the threshold value can be set to a larger value, so that the width of the light shielding piece 3 along the first direction x is more set to the second width, to ensure that the head-up display device has higher resolution, but the crosstalk problem will be relatively serious.

[0108] S204, according to the plurality of light ray crosstalk areas, the cylindrical lens grating is divided into at least two cylindrical lens partitions, and the cylindrical lens partition includes at least two cylindrical lenses, and the at least two cylindrical lens partitions include a first cylindrical lens partition and a second cylindrical lens partition; wherein the first cylindrical lens partition includes the light ray crosstalk area.

[0109] S205, disposing the light shielding member in the first cylindrical lens subregion.

[0110] It should be noted that the above only describes the preferred embodiments of the present application and the principles of the applied technology. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, reconfigurations, combinations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A head-up display device, characterized in that: include: an image source, the image source being configured to generate a left-eye image beam and a right-eye image beam; a lenticular grating located on the propagation paths of the left-eye image beam and the right-eye image beam, and configured to split and project the left-eye image beam and the right-eye image beam; the lenticular grating comprising at least two lenticular subregions, each of which comprises at least two cylindrical lenses; The at least two cylindrical lens partitions include a first cylindrical lens partition and a second cylindrical lens partition. In both the first cylindrical lens partition and the second cylindrical lens partition, the light shielding member is located in the first cylindrical lens partition.

2. The head-up display device according to claim 1, wherein: The light shielding member and the cylindrical lens extend in the same direction.

3. The head-up display device according to claim 1, wherein: The light shielding member is located between the image source and the lenticular lens; Alternatively, the light shielding member is located on a side of the lenticular lens away from the image source.

4. The head-up display device according to claim 1, wherein: The plurality of cylindrical lenses are arranged along a first direction; The cylindrical lens includes a central area and an edge area, the geometric center of the cylindrical lens is located in the central area, and along the first direction, the edge area is located outside the central area; The light shielding element covers the edge area in a direction perpendicular to the plane where the lenticular lens grating is located.

5. The head-up display device according to claim 4, characterized in that: In the first lenticular segment, a plurality of the light shielding members are periodically arranged.

6. The head-up display device according to claim 4, characterized in that: The edge region includes a first edge region and a second edge region. In the same cylindrical lens, the first edge region and the second edge region are located on both sides of the central region. In the first cylindrical lens partition, the light shielding member covers the first edge area; Alternatively, in the first lenticular subregion, the light shielding member covers the second edge region.

7. The head-up display device according to claim 4, characterized in that: The edge region includes a first edge region and a second edge region. In the same cylindrical lens, the first edge region and the second edge region are located on both sides of the central region. In the first cylindrical lens subregion, the same light shielding member covers the first edge region and the second edge region of adjacent cylindrical lenses.

8. The head-up display device according to claim 7, characterized in that: Along the first direction, the first edge region and the second edge region have different widths.

9. The head-up display device according to claim 4, characterized in that: The image source includes a plurality of sub-pixels; Along the first direction, the width of the light shielding member is less than or equal to the width of the sub-pixel.

10. The head-up display device according to claim 4, characterized in that: Along the first direction, a width of the cylindrical lens is greater than or equal to 100 μm and less than or equal to 300 μm.

11. The head-up display device according to claim 4, characterized in that: In the first lenticular segment, the plurality of light shielding members have the same width along the first direction.

12. The head-up display device according to claim 4, characterized in that: In the first lenticular subregion, along the first direction, there are at least two light-shielding members having different widths.

13. The head-up display device according to claim 1, wherein: It also includes a curved reflector, which is located on the propagation path of the split left-eye image light beam and the right-eye image light beam.

14. A carrier, characterized in that: The invention comprises the head-up display device according to any one of claims 1 to 13, and a windshield.

15. A design method for a head-up display device, characterized in that: The head-up display device includes an image source, a lenticular lens, and a light shielding member; the image source is used to generate a left-eye image beam and a right-eye image beam; the lenticular lens is located on the propagation paths of the left-eye image beam and the right-eye image beam, and is used to split and project the left-eye image beam and the right-eye image beam; The design method includes: Acquiring a plurality of light crosstalk regions on the lenticular grating; According to the plurality of light crosstalk regions, the lenticular grating is divided into at least two lenticular partitions, wherein the lenticular partition includes at least two cylindrical lenses, and the at least two cylindrical lens partitions include a first lenticular partition and a second lenticular partition; wherein the first lenticular partition includes the light crosstalk region; The shading element is disposed in the first cylindrical lens partition.

16. The design method according to claim 15, characterized in that: The plurality of cylindrical lenses are arranged along a first direction; After acquiring a plurality of light crosstalk areas on the cylindrical grating, the method further includes: Obtaining widths of a plurality of the light crosstalk areas along the first direction; According to the widths of the plurality of light crosstalk areas along the first direction, the widths of the light shielding member corresponding to the light crosstalk areas along the first direction are acquired.

17. The design method according to claim 16, characterized in that: The width of the light shielding member along the first direction is greater than or equal to the width of the minimum crosstalk area and less than or equal to the width of the maximum crosstalk area; The minimum crosstalk area width is the minimum width of the plurality of light crosstalk areas along the first direction, and the maximum crosstalk area width is the maximum width of the plurality of light crosstalk areas along the first direction.

18. The design method according to claim 16, characterized in that: Obtaining the widths of the plurality of light crosstalk areas along the first direction includes: Obtaining the stray light density distribution of the plurality of light crosstalk areas; The width of the light crosstalk area along the first direction is obtained according to the stray light density distribution.

19. The design method according to claim 16, characterized in that: Acquiring, according to the widths of the plurality of light crosstalk areas along the first direction, the widths of the light shielding member corresponding to the light crosstalk areas along the first direction, comprises: Determining whether the width of the light crosstalk area along the first direction is greater than a threshold; When the width of the light crosstalk area along the first direction is greater than a threshold value, the width of the light shading member along the first direction is set to a first width; when the width of the light crosstalk area along the first direction is less than or equal to the threshold value, the width of the light shading member along the first direction is set to a second width; the first width is greater than the second width.

20. The design method according to claim 15, characterized in that: Acquiring a plurality of light crosstalk regions on the cylindrical grating includes: Only the light on the receiving surface is retained; Tracing the light on the receiving surface back to the cylindrical grating to find the distribution of the crosstalk light on the cylindrical grating; According to the distribution of the crosstalk light on the lenticular grating, a plurality of light crosstalk areas on the lenticular grating are obtained.

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