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

Abstract

A head-up display device (100), comprising an image source group (110), a primary reflecting mirror group (120), a near-focal-plane secondary reflecting mirror (130), and a far-focal-plane secondary reflecting mirror (140). The design method comprises: reducing the dimension of an eyebox (300) from a first preset dimension to a second preset dimension; and expanding the field of view from a first preset field of view to a second preset field of view. For the head-up display device (100), the light envelope volume under the first preset dimension and the first preset field of view is a first light envelope volume, the light envelope volume under the second preset dimension and the second preset field of view is a second light envelope volume, and the difference between the first light envelope volume and the second light envelope volume is less than a preset value.

Description

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

[0001] This application claims priority to the Chinese patent application No. 202411255345.1 filed on September 9, 2024 with the China Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of head-up display, for example, to a head-up display device, a design method thereof, and a vehicle. BACKGROUND

[0003] With the popularization of automobiles, automobiles are becoming more and more intelligent. In order to improve driving safety and make the driver pay more attention to the road, more and more vehicles use head-up displays (HUD) instead of instrument panels to display driving information. With the development of head-up displays, different types of HUDs have emerged, among which augmented reality head-up displays (AR-HUD) have been widely used.

[0004] In order to ensure that the head-up display can provide more information and achieve a wider lane coverage, the AR-HUD needs to realize the combination of digital projection and physical environment. At present, the common method is to divide the AR-HUD into two picture displays, one of which displays close-up and the other displays long shot to meet the needs of different distance scenes. Under this background, the dual-focal head-up display has become an important trend in the industry. SUMMARY

[0005] The embodiments of the present application provide a head-up display device, a design method thereof, and a vehicle, which realize dual-picture display and reduce the volume of the head-up display device.

[0006] In a first aspect, the embodiments of the present application provide a design method of a head-up display device, the head-up display device comprising an image source group, a primary mirror group, a near-focal secondary mirror, and a far-focal secondary mirror.

[0007] The design method comprises:

[0008] reducing the size of the eyebox from a first preset size to a second preset size;

[0009] enlarging the field of view from a first preset field of view to a second preset field of view;

[0010] The light ray envelope volume of the head-up display device under the first preset size and the first preset field of view is a first light ray envelope volume, and the light ray envelope volume under the second preset size and the second preset field of view is a second light ray envelope volume, and a difference between the first light ray envelope volume and the second light ray envelope volume is less than a preset value.

[0011] Optionally, the primary mirror set includes a near-focus primary mirror and a far-focus primary mirror.

[0012] Before the size of the eyebox is reduced from the first preset size to the second preset size, the method further includes:

[0013] The surface type of the near-focus secondary mirror and the far-focus secondary mirror is optimized, and the optical path between the near-focus primary mirror and the near-focus secondary mirror is optimized, and the optical path between the far-focus primary mirror and the far-focus secondary mirror is optimized.

[0014] Optionally, the surface type of the near-focus secondary mirror and the far-focus secondary mirror is optimized, including:

[0015] By setting the position parameters and the surface type coefficients as variables, the parameters of the space position eccentric rotation are constrained, and the surface type of the near-focus secondary mirror and the far-focus secondary mirror is optimized with the minimum of the object plane point dispersion spot as the optimization target.

[0016] Optionally, after the field of view is expanded from the first preset field of view to the second preset field of view, the method further includes:

[0017] The surface type of the near-focus secondary mirror and the far-focus secondary mirror is optimized again.

[0018] Optionally, the second preset size includes a second preset vertical size and a second preset horizontal size, the second preset vertical size is a size of the eyebox in a vertical direction when the eyebox is in the second preset size, and the second preset horizontal size is a size of the eyebox in a horizontal direction when the eyebox is in the second preset size.

[0019] The second preset horizontal size is greater than a preset pupil distance.

[0020] In a second aspect, an embodiment of the present application provides a head-up display device, which is formed by the design method in the first aspect, and includes an image source set, a primary mirror set, a near-focus secondary mirror, and a far-focus secondary mirror.

[0021] The image source set is configured to generate a first image beam and a second image beam.

[0022] The first mirror group is arranged to project the first image light beam to the near-focal secondary mirror and to project the second image light beam to the far-focal secondary mirror.

[0023] The near-focal secondary mirror is arranged to form a first image according to the projection of the first image light beam.

[0024] The far-focal secondary mirror is arranged to form a second image according to the projection of the second image light beam.

[0025] Optionally, the near-focal secondary mirror and the far-focal secondary mirror are both curved mirrors.

[0026] Optionally, the surface type of the near-focal secondary mirror and the far-focal secondary mirror both conforms to an XY polynomial.

[0027] Optionally, the first mirror group comprises a near-focal first mirror and a far-focal first mirror.

[0028] The near-focal first mirror is arranged to project the first image light beam to the near-focal secondary mirror, and the far-focal first mirror is arranged to project the second image light beam to the far-focal secondary mirror.

[0029] Optionally, the optical path between the near-focal first mirror and the near-focal secondary mirror is greater than 203.21mm and less than 224.6mm.

[0030] And / or, the optical path between the far-focal first mirror and the far-focal secondary mirror is greater than 362.78mm and less than 400.96mm.

[0031] Optionally, the first mirror group comprises a first mirror, and the first mirror comprises a near-focal first mirror region and a far-focal first mirror region.

[0032] The near-focal first mirror region is arranged to project the first image light beam to the near-focal secondary mirror, and the far-focal first mirror region is arranged to project the second image light beam to the far-focal secondary mirror.

[0033] Optionally, the image source group comprises an image source, and the image source comprises a first display region and a second display region, the first display region is arranged to generate the first image light beam, and the second display region is arranged to generate the second image light beam.

[0034] Optionally, the image source group comprises a first image source and a second image source, the first image source is arranged to generate the first image light beam, and the second image source is arranged to generate the second image light beam.

[0035] Optionally, the telephoto secondary mirror is located between the image source group and the close-up secondary mirror.

[0036] Optionally, the primary mirror group comprises a close-up primary mirror and a telephoto primary mirror.

[0037] The close-up primary mirror is configured to project the first image light beam to the close-up secondary mirror, and the telephoto primary mirror is configured to project the second image light beam to the telephoto secondary mirror.

[0038] The close-up primary mirror is located opposite to the close-up secondary mirror, and the telephoto primary mirror is located opposite to the telephoto secondary mirror.

[0039] In a third aspect, an embodiment of the present application provides a vehicle comprising the head-up display device in the second aspect and a windshield.

[0040] The first image light beam emitted by the head-up display device is projected to the windshield to form the first image, and the second image light beam emitted by the head-up display device is projected to the windshield to form the second image. BRIEF DESCRIPTION OF DRAWINGS

[0041] FIG. 1 is a schematic diagram of a downward viewing angle according to an embodiment of the present application;

[0042] FIG. 2 is a schematic diagram of a head-up display device according to an embodiment of the present application;

[0043] FIG. 3 is a schematic diagram of another head-up display device according to an embodiment of the present application;

[0044] FIG. 4 is a schematic diagram of another head-up display device according to an embodiment of the present application;

[0045] FIG. 5 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0046] FIG. 6 is a schematic diagram of another vehicle according to an embodiment of the present application;

[0047] FIG. 7 is a flowchart of a design method of a head-up display device according to an embodiment of the present application;

[0048] FIG. 8 is a schematic diagram of another head-up display device according to an embodiment of the present application;

[0049] FIG. 9 is a schematic diagram of an optical path of a head-up display device according to an embodiment of the present application;

[0050] FIG. 10 is a schematic diagram of an optical path of another head-up display device according to an embodiment of the present application;

[0051] FIG. 11 is a flow chart of another design method of the head-up display device according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the present application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings rather than all the parts.

[0053] Before the embodiments of the present disclosure are further described, the terms and phrases involved in the embodiments of the present disclosure are explained, which are applicable to the following explanations.

[0054] Eyebox: the range of eye positions from which the complete image is visible to the driver.

[0055] Horizontal field of view: the angle between the lines connecting the eye point and the midpoints of the left and right vertical edges of the rectangular virtual image.

[0056] Vertical field of view: the angle between the lines connecting the eye point and the midpoints of the top and bottom horizontal edges of the rectangular virtual image.

[0057] Downward angle: the angle between the line connecting the eye point and the center of the virtual image and the horizontal plane. The downward angle is the angle shown in FIG. 1.

[0058] A possible application scenario of the embodiments of the present application is that the head-up display device is applied to a car. It should be understood by those skilled in the art that the head-up display device of the embodiments of the present application can also be applied to, for example, a sanitation vehicle, a fire vehicle, a military vehicle, and of course, can also be applied to the field of ships, aviation, etc. For example, it can be applied to a fighter aircraft, so that the pilot can track and aim at an object based on the assistance of the head-up display device.

[0059] The head-up display device usually transmits image light to a projection medium, such as a specially designed screen in front of the driver, or directly reflects to a proper position of the windshield of the car. The light reflected by the projection medium enters the eyebox range, thereby forming a target virtual image in front of the driver which can be observed within the eyebox range. In the exemplary embodiments of the present application, the windshield is taken as an example to illustrate the projection medium which finally reflects the image light to the human eye.

[0060] The design method of the head-up display device involves the structure of the head-up display device. Therefore, the structure of the head-up display device is first explained.

[0061] FIG. 2 is a schematic diagram of a head-up display device according to an embodiment of the present application. Referring to FIG. 2, the head-up display device 100 includes an image source group 110, a primary mirror group 120, a near-focal secondary mirror 130, and a far-focal secondary mirror 140. The image source group 110 is configured to generate a first image beam L21 and a second image beam L22. The primary mirror group 120 is configured to project the first image beam L21 to the near-focal secondary mirror 130 and project the second image beam L22 to the far-focal secondary mirror 140. The near-focal secondary mirror 130 is configured to form a first image according to the projection of the first image beam L21. The far-focal secondary mirror 140 is configured to form a second image according to the projection of the second image beam L22.

[0062] The first image formed by the projection of the first image beam L21 is different from the second image formed by the projection of the second image beam L22 in terms of a downward viewing angle. The first image formed by the projection of the first image beam L21 and the second image formed by the projection of the second image beam L22 can have the same eyebox.

[0063] The first image can be a close-up image and the second image can be a long-range image. In other embodiments, the head-up display device 100 can also project images of at least three different focal lengths. For the sake of simplicity, the first image and the second image projected by the head-up display device 100 are taken as examples for explanation and description in various embodiments of the present application.

[0064] For example, the second image is needed in a scenario such as lane assistance that needs to be combined with real vehicle conditions. The first image is needed in a virtual image scenario such as conventional speed display.

[0065] In the embodiments of the present application, the first image beam L21 generated by the image source group 110 is projected to form the first image after passing through the primary mirror group 120 and the near-focal secondary mirror 130. The second image beam L22 generated by the image source group 110 is projected to form the second image after passing through the primary mirror group 120 and the far-focal secondary mirror 140. Thus, dual-image display is achieved. Since the head-up display device 100 of the present application does not need to use two independent projection lenses, the volume of the head-up display device 100 can be reduced.

[0066] Optionally, referring to FIG. 2, the near-focal secondary mirror 130 and the far-focal secondary mirror 140 are both curved mirrors. After increasing the optical depth of field and magnification by the curved mirrors, a virtual image with depth of field is projected to the windshield and formed in front of the vehicle. That is, a first image with depth of field and a second image with depth of field are formed.

[0067] Optionally, referring to FIG. 2, the surface types of the near-focal secondary mirror 130 and the far-focal secondary mirror 140 both conform to an XY polynomial.

[0068] For example, the analytical form of the XY polynomial is: Z1(x, y) = A1x + A2y + A3xy + A4x 2 +A5y 2 +A6xy 2 +A7x 2 y+A8x 3 +A9y 3 +A 10 xy 3 +A 11 x 2 y 2 +A 12 x 3 y+A 13 x 4 +A 14 y 4 +A 15 xy 4 +A 16 x 2 y 3 +A 17 x 3 y 2 +A 18 x 4 y+A 19 x 5 +A 20 y 5 , wherein A1 to A 20 are coefficients of the polynomial. The embodiment of the present application adopts high-order polynomial automatic design, and adjusts the surface shape of the near-focal surface secondary mirror 130 and the far-focal surface secondary mirror 140 in combination with constraint conditions, so as to achieve accurate light path reflection and reduce image distortion.

[0069] Optionally, referring to FIG. 2, the primary mirror group 120 includes a near-focal surface primary mirror 121 and a far-focal surface primary mirror 122. The near-focal surface primary mirror 121 is configured to project the first image light beam L21 to the near-focal surface secondary mirror 130. The far-focal surface primary mirror 122 is configured to project the second image light beam L22 to the far-focal surface secondary mirror 140.

[0070] Optionally, referring to FIG. 2, the optical path between the near-focal surface primary mirror 121 and the near-focal surface secondary mirror 130 is greater than 203.21 mm and less than 224.6 mm; and / or, the optical path between the far-focal surface primary mirror 122 and the far-focal surface secondary mirror 140 is greater than 362.78 mm and less than 400.96 mm. When the far-focal design and the near-focal design meet the above range, the optical path between the two secondary mirrors is optimized.

[0071] Exemplarily, referring to FIG. 2, the near-focal primary mirror 121, the far-focal primary mirror 122, the near-focal secondary mirror 130 and the far-focal secondary mirror 140 can change the propagation path of the image light beam in the horizontal plane and the vertical plane, respectively. At least one of the near-focal primary mirror 121, the far-focal primary mirror 122, the near-focal secondary mirror 130 and the far-focal secondary mirror 140 can change the size of the target virtual image in one direction or multiple directions.

[0072] FIG. 3 is a schematic diagram of another head-up display device provided by an embodiment of the present application. Referring to FIG. 3, the primary mirror group 120 includes a primary mirror, and the primary mirror includes a near-focal primary reflection area 1201 and a far-focal primary reflection area 1202. The near-focal primary reflection area 1201 is configured to project the first image light beam L21 to the near-focal secondary mirror 130. The far-focal primary reflection area 1202 is configured to project the second image light beam L22 to the far-focal secondary mirror 140. In the present embodiment, one primary mirror is provided, and different reflection areas of the primary mirror reflect the first image light beam L21 and the second image light beam L22, respectively, which can reduce the volume of the head-up display device 100.

[0073] Optionally, referring to FIG. 2, the image source group 110 includes an image source, and the image source includes a first display area 1101 and a second display area 1102. The first display area 1101 is configured to generate the first image light beam L21, and the second display area 1102 is configured to generate the second image light beam L22. In the present embodiment, one image source is provided, and different display areas of the image source generate the first image light beam L21 and the second image light beam L22, respectively, which can reduce the volume of the head-up display device 100.

[0074] FIG. 4 is a schematic diagram of another head-up display device provided by an embodiment of the present application. Referring to FIG. 4, the image source group 110 includes a first image source 111 and a second image source 112. The first image source 111 is configured to generate the first image light beam L21, and the second image source 112 is configured to generate the second image light beam L22. In the present embodiment, the first image source 111 and the second image source 112 are provided, and the first image source 111 and the second image source 112 control the virtual image plane separately. That is, the first image source 111 and the second image source 112 control the first image and the second image separately.

[0075] Optionally, referring to FIG. 2, the telephoto secondary mirror 140 is located between the image source group 110 and the close-up secondary mirror 130. The close-up secondary mirror 130 projects the first image light beam L21 in a direction away from the image source group 110. The telephoto secondary mirror 140 projects the second image light beam L22 in a direction away from the image source group 110. The telephoto secondary mirror 140 is located between the image source group 110 and the close-up secondary mirror 130, thereby the lower viewing angle of the first image projected by the close-up secondary mirror 130 is greater than the lower viewing angle of the second image projected by the telephoto secondary mirror 140.

[0076] Optionally, referring to FIG. 2, the primary mirror group 120 includes a close-up primary mirror 121 and a telephoto primary mirror 122. The close-up primary mirror 121 is configured to project the first image light beam L21 to the close-up secondary mirror 130. The telephoto primary mirror 122 is configured to project the second image light beam L22 to the telephoto secondary mirror 140. The close-up primary mirror 121 is located opposite to the close-up secondary mirror 130, and the telephoto primary mirror 122 is located opposite to the telephoto secondary mirror 140. The first image light beam L21 and the second image light beam L22 do not cross the light path during the process of propagating from the image source group 110 to the close-up primary mirror 121 and the telephoto primary mirror 122, then propagating to the close-up secondary mirror 130 and the telephoto secondary mirror 140, and finally being projected out by the close-up secondary mirror 130 and the telephoto secondary mirror 140.

[0077] Exemplarily, referring to FIG. 2, the head-up display device 100 further includes an IP baffle 150 and a housing 160. The image source group 110, the primary mirror group 120, the close-up secondary mirror 130, and the telephoto secondary mirror 140 are located inside the housing 160. The IP baffle 150 is located outside the housing 160. The IP baffle 150 is in abutment with an opening on the housing 160. The IP baffle 150 is located on a side of the close-up secondary mirror 130 away from the image source group 110. The first image light beam L21 reflected by the close-up secondary mirror 130 passes through the inside of the IP baffle 150. The second image light beam L22 reflected by the telephoto secondary mirror 140 passes through the inside of the IP baffle 150.

[0078] FIG. 5 is a schematic diagram of a vehicle according to an embodiment of the present application. In combination with FIG. 2 and FIG. 5, the vehicle includes the head-up display device 100 and the windshield 200 in the above embodiments. The first image light beams emitted by the head-up display device 100 are projected to the windshield 200 to form a first image. The second image light beams emitted by the head-up display device 100 are projected to the windshield 200 to form a second image. It should be noted that in the virtual image plane 400 shown in FIG. 5, the observer's eyes are located at the eyebox 300, and the first image and / or the second image can be observed.

[0079] FIG. 6 is a schematic diagram of another vehicle according to an embodiment of the present application. In combination with FIG. 5 and FIG. 6, the first image light beams L21 emitted by the head-up display device 100 are projected to a relatively lower area of the windshield 200 and reflected by the windshield 200 to the eyebox 300 to form a first image (virtual image). The second image light beams L22 emitted by the head-up display device 100 are projected to a relatively upper area of the windshield 200 and reflected by the windshield 200 to the eyebox 300 to form a second image (virtual image). The first image formed by the projection of the first image light beams L21 is located at a relatively lower position, and the second image formed by the projection of the second image light beams L22 is located at a relatively upper position. The lower viewing angle of the first image formed by the projection of the near-focal secondary mirror 130 is greater than the lower viewing angle of the second image formed by the projection of the far-focal secondary mirror 140.

[0080] The introduction of the bifocal surface increases the light path envelope volume and also brings greater difficulty to the expansion of the field of view angle in the original optical system.

[0081] FIG. 7 is a flowchart of a design method of a head-up display device according to an embodiment of the present application. FIG. 8 is a schematic diagram of another head-up display device according to an embodiment of the present application. In combination with FIG. 6-FIG. 8, the design method includes:

[0082] S101, reducing the size of the eyebox from a first preset size to a second preset size.

[0083] In this step, the size of the eyebox 300 is reduced from the first preset size to the second preset size, and the field of view angle (including the horizontal field of view angle and the vertical field of view angle) can be kept unchanged, thereby reducing the light path envelope volume. The light path envelope volume includes the internal light of the head-up display device 100 and the volume enveloped by the light emitted by the head-up display device 100.

[0084] FIG. 9 is a schematic diagram of an optical path of a head-up display device according to an embodiment of the present application. As shown in FIG. 9, the first preset size includes a first preset vertical size 52 and a first preset horizontal size 51. The first preset vertical size 52 is a size of the eyebox 300 in the vertical direction at the first preset size, and the first preset horizontal size 51 is a size of the eyebox 300 in the horizontal direction at the first preset size.

[0085] FIG. 10 is a schematic diagram of an optical path of another head-up display device according to an embodiment of the present application. As shown in FIG. 10, the second preset size includes a second preset vertical size 62 and a second preset horizontal size 61. The second preset vertical size 62 is a size of the eyebox 300 in the vertical direction at the second preset size, and the second preset horizontal size 61 is a size of the eyebox 300 in the horizontal direction at the second preset size. Compared with FIG. 9, the size of the eyebox 300 shown in FIG. 10 is reduced, the second preset vertical size 62 is smaller than the first preset vertical size 52, and the second preset horizontal size 61 is smaller than the first preset horizontal size 51.

[0086] For example, the first preset horizontal size 51 is 130 mm, and the first preset vertical size 52 is 50 mm. The first preset size can be represented as 130 mm x 50 mm, i.e., the eyebox 300 at the first preset size is an eyebox 300 of 130 mm x 50 mm. The second preset horizontal size 61 is 80 mm, and the second preset vertical size 62 is 20 mm. The second preset size can be represented as 80 mm x 20 mm.

[0087] In S102, the field of view is expanded from the first preset field of view to the second preset field of view.

[0088] In this step, the field of view is expanded from the first preset field of view to the second preset field of view. The light ray envelope volume of the head-up display device 100 at the first preset size and the first preset field of view is a first light ray envelope volume, and the light ray envelope volume at the second preset size and the second preset field of view is a second light ray envelope volume. The difference between the first light ray envelope volume and the second light ray envelope volume is less than a preset value.

[0089] Exemplarily, the first preset field of view angle includes a first near focal plane preset vertical field of view angle, a first near focal plane preset horizontal field of view angle, a first far focal plane preset vertical field of view angle and a first far focal plane preset horizontal field of view angle. The second preset field of view angle includes a second near focal plane preset vertical field of view angle, a second near focal plane preset horizontal field of view angle, a second far focal plane preset vertical field of view angle and a second far focal plane preset horizontal field of view angle. The second near focal plane preset vertical field of view angle is greater than the first near focal plane preset vertical field of view angle, and the second near focal plane preset horizontal field of view angle is greater than the first near focal plane preset horizontal field of view angle. The second far focal plane preset vertical field of view angle is greater than the first far focal plane preset vertical field of view angle, and the second far focal plane preset horizontal field of view angle is greater than the first far focal plane preset horizontal field of view angle.

[0090] Exemplarily, the first near focal plane preset vertical field of view angle is 1°, the first near focal plane preset horizontal field of view angle is 4°, the first far focal plane preset vertical field of view angle is 3°, and the first far focal plane preset horizontal field of view angle is 10°. The second near focal plane preset vertical field of view angle is 2°, the second near focal plane preset horizontal field of view angle is 5°, the second far focal plane preset vertical field of view angle is 4°, and the second far focal plane preset horizontal field of view angle is 11°.

[0091] Referring to FIG. 8, the first image light beam L21 schematically shows a near focal plane ray envelope under the first preset size and the first preset field of view angle, and the second image light beam L22 schematically shows a far focal plane ray envelope under the first preset size and the first preset field of view angle. The expanded first image light beam L31 schematically shows a near focal plane ray envelope under the second preset size and the second preset field of view angle, and the expanded second image light beam L32 schematically shows a far focal plane ray envelope under the second preset size and the second preset field of view angle. After the field of view angle is expanded, the near focal plane ray envelope and the far focal plane ray envelope are reduced at one end close to the eye box 300. The near focal plane ray envelope and the far focal plane ray envelope are expanded at one end close to the virtual image plane 400. Overall, the second ray envelope volume after the field of view angle is expanded is consistent with the first ray envelope volume before the field of view angle is expanded.

[0092] The design method of the head-up display device provided in the embodiments of the present application is applied to the head-up display device in the above embodiments, and the head-up display device produced by the design method can realize double picture display and reduce the volume of the head-up display device. In addition, the embodiments of the present application reduce the size of the eye box 300 to ensure that the ray envelope volumes before and after the field of view angle is expanded are basically consistent, thereby realizing the increase of the field of view angle. Thus, a larger field of view angle is realized without increasing the volume of the head-up display device. Therefore, the head-up display device does not occupy a larger space in the vehicle, and the modification of the surrounding of the vehicle is avoided.

[0093] FIG. 11 is a flow chart of another design method of a head-up display device provided in the embodiments of the present application. Referring to FIG. 11, the design method includes:

[0094] S201, optimizing the surface shape of the near-focal secondary mirror and the far-focal secondary mirror, optimizing the optical path between the near-focal primary mirror and the near-focal secondary mirror, and optimizing the optical path between the far-focal primary mirror and the far-focal secondary mirror.

[0095] The sub-step of optimizing the surface shape of the near-focal secondary mirror and the far-focal secondary mirror includes: setting the position parameters and the surface shape coefficients as variables, constraining the parameters of the space position eccentric rotation, taking the minimum of the object plane point diffraction spot as the optimization target, and optimizing the surface shape of the near-focal secondary mirror and the far-focal secondary mirror.

[0096] S202, reducing the size of the eyebox from a first preset size to a second preset size.

[0097] Optionally, the second preset size includes a second preset vertical size and a second preset horizontal size, and the second preset horizontal size is greater than the preset interpupillary distance. The size of the eyebox after the reduction is still greater than the interpupillary distance of an ordinary person, which can ensure that the driver can see a complete image in a normal driving condition, and can ensure that the use area of the light on the windshield glass 200 does not exceed the use area of the light before the field of view angle is expanded, thereby ensuring the imaging quality.

[0098] S203, expanding the field of view angle from a first preset field of view angle to a second preset field of view angle.

[0099] S204, optimizing the surface shape of the near-focal secondary mirror and the far-focal secondary mirror again.

[0100] In the embodiments of the present application, on the basis of the above-mentioned embodiments, the surface shape of the near-focal secondary mirror and the far-focal secondary mirror is optimized, the optical path between the near-focal primary mirror and the near-focal secondary mirror is optimized, and the optical path between the far-focal primary mirror and the far-focal secondary mirror is optimized. In addition, after the field of view angle is expanded from the first preset field of view angle to the second preset field of view angle, the surface shape of the near-focal secondary mirror and the far-focal secondary mirror is optimized again, so as to achieve accurate light path reflection and reduce image distortion.

[0101] Exemplarily, before the step S202, the design method can further include: under the condition that the light does not interfere, the head-up display device 100 sets the light envelope to be maximum at the first preset size and the first preset field of view angle, sets the maximum use area of the image source group 110 corresponding to this time, and sets the field of view (FoV) size corresponding to this time.

Claims

1. A method for designing a head-up display device, the head-up display device comprising an image source group, a primary mirror group, a near focus secondary mirror and a far focus secondary mirror; The method comprises: reducing the size of the eyebox from a first preset size to a second preset size; enlarging the field of view angle from a first preset field of view angle to a second preset field of view angle; wherein the light ray envelope volume of the head-up display device under the first preset size and the first preset field of view angle is a first light ray envelope volume, and the light ray envelope volume under the second preset size and the second preset field of view angle is a second light ray envelope volume, and the difference between the first light ray envelope volume and the second light ray envelope volume is less than a preset value.

2. The design method of a head-up display device according to claim 1, wherein, The primary mirror group comprises a near focus primary mirror and a far focus primary mirror; Before reducing the size of the eyebox from the first preset size to the second preset size, the method further comprises: optimizing the surface type of the near focus secondary mirror and the far focus secondary mirror, optimizing the optical path between the near focus primary mirror and the near focus secondary mirror, and optimizing the optical path between the far focus primary mirror and the far focus secondary mirror.

3. The design method of a head-up display device according to claim 2, wherein, The optimization of the surface type of the near focus secondary mirror and the far focus secondary mirror comprises: setting the position parameters and the surface type coefficients as variables, constraining the parameters of the space position eccentric rotation, and taking the minimum of the object surface point dispersion spot as the optimization target to optimize the surface type of the near focus secondary mirror and the far focus secondary mirror. 4.The method for designing the head-up display device according to claim 2, after enlarging the field of view angle from the first preset field of view angle to the second preset field of view angle, the method further comprises: optimizing the surface type of the near focus secondary mirror and the far focus secondary mirror again.

5. The design method of a head-up display device according to claim 1, wherein, The second preset size comprises a second preset vertical size and a second preset horizontal size, the second preset vertical size is the size of the eyebox in the vertical direction under the second preset size, and the second preset horizontal size is the size of the eyebox in the horizontal direction under the second preset size; The second preset horizontal size is greater than a preset pupil distance. 6.A head-up display device formed by the method for designing according to any one of claims 1-5, the head-up display device comprising an image source group, a primary mirror group, a near focus secondary mirror and a far focus secondary mirror; The image source group is configured to generate a first image beam and a second image beam; The primary mirror group is configured to project the first image beam to the near focus secondary mirror and project the second image beam to the far focus secondary mirror; The near focus secondary mirror is configured to form a first image according to the projection of the first image beam; The far focus secondary mirror is configured to form a second image according to the projection of the second image beam.

7. The head-up display device according to claim 6, wherein The near focus secondary mirror and the far focus secondary mirror are both curved mirrors.

8. The head-up display device according to claim 7, wherein The surface type of the near focus secondary mirror and the far focus secondary mirror both conforms to an XY polynomial.

9. The head-up display device according to claim 6, wherein The primary mirror group comprises a near focus primary mirror and a far focus primary mirror. The near-focal primary mirror is configured to project the first image beam to the near-focal secondary mirror, and the tele-focal primary mirror is configured to project the second image beam to the tele-focal secondary mirror.

10. The head-up display device according to claim 9, wherein The optical path between the near-focal primary mirror and the near-focal secondary mirror is greater than 203.21mm and less than 224.6mm. And / or, the optical path between the tele-focal primary mirror and the tele-focal secondary mirror is greater than 362.78mm and less than 400.96mm.

11. The head-up display device according to claim 6, wherein The primary mirror group comprises a primary mirror, and the primary mirror comprises a near-focal primary mirror area and a tele-focal primary mirror area. The near-focal primary mirror area is configured to project the first image beam to the near-focal secondary mirror, and the tele-focal primary mirror area is configured to project the second image beam to the tele-focal secondary mirror.

12. The head-up display device according to claim 6, wherein, The image source group comprises an image source, and the image source comprises a first display area and a second display area.

13. The head-up display device according to claim 6, wherein, The image source group comprises a first image source and a second image source.

14. The head-up display device according to claim 6, wherein, The tele-focal secondary mirror is located between the image source group and the near-focal secondary mirror.

15. The head-up display device of claim 14, wherein, The primary mirror group comprises a near-focal primary mirror and a tele-focal primary mirror. The near-focal primary mirror is configured to project the first image beam to the near-focal secondary mirror, and the tele-focal primary mirror is configured to project the second image beam to the tele-focal secondary mirror. The near-focal primary mirror and the near-focal secondary mirror are oppositely arranged, and the tele-focal primary mirror and the tele-focal secondary mirror are oppositely arranged.

16. A vehicle comprising the head-up display device of any one of claims 6-15 and a windshield. The first image beam emitted by the head-up display device is projected to the windshield to form the first image, and the second image beam emitted by the head-up display device is projected to the windshield to form the second image.

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