Double-focal-plane head-up display system

Abstract

The utility model discloses a bifocal plane head-up display system, which comprises an eye pupil box, a display screen, a first reflector and a second reflector, the eye pupil box is arranged at a first position; the second reflecting mirror is arranged at a second position; the first reflecting mirror is arranged at a third position; the display screen is arranged at the fourth position; the display screen is provided with two display areas so as to emit two light sources, and one light source corresponds to one display area; the two light sources are respectively and sequentially reflected by the first reflector, the second reflector and the eye pupil box to form two virtual image distance subsystems with different virtual image distances. According to the utility model, two virtual image distance subsystems with different virtual image distances can be formed based on the same reflector, so that two virtual images with different virtual image distances can be respectively displayed at two positions, a driver can conveniently check the virtual images, the user experience is high, safe driving is facilitated, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the field of optics, in particular to a double-focal-plane head-up display system. Background Art

[0002] Head up display (HUD) is a vehicle-mounted visual aid. HUD can project the information required for driving at a certain distance in front of the driver (virtual image surface), allowing the driver to view driving-related information such as vehicle speed, fuel level, and navigation while observing the outside world, thereby avoiding the risk of driving blind spots caused by looking down at the dashboard information.

[0003] Since most current HUD systems only have one virtual image plane, for driving safety reasons, if the image displayed by the HUD is not in the position where the driver focuses on the road and surrounding scenery, the human eye will have a period of time to adjust the focus, resulting in a poor user experience and detrimental to driving safety. Utility Model Content

[0004] In view of the above problems, the present invention provides a dual-focal-plane head-up display system that overcomes the above problems or at least partially solves the above problems.

[0005] A dual-focal-plane head-up display system comprises: a pupil box, a display screen, a first reflector and a second reflector;

[0006] The pupil box is arranged at a first position, wherein the first position is located in a first three-dimensional rectangular coordinate system with the center of the pupil box as the origin;

[0007] The second reflector is disposed at a second position, wherein the second position is located in a second three-dimensional rectangular coordinate system with a geometric center of the second reflector as an origin, and the second three-dimensional rectangular coordinate system is obtained by rotating the first three-dimensional rectangular coordinate system;

[0008] The first reflector is set at a third position, wherein the third position is located in a third three-dimensional rectangular coordinate system with the geometric center of the first reflector as the origin, and the third three-dimensional rectangular coordinate system is obtained by rotating based on the first three-dimensional rectangular coordinate system;

[0009] The display screen is set at a fourth position, wherein the fourth position is located in a fourth three-dimensional rectangular coordinate system with the center of the display screen as the origin, and the fourth three-dimensional rectangular coordinate system is obtained by rotating based on the first three-dimensional rectangular coordinate system;

[0010] The display screen is provided with two display areas to emit two light sources, wherein one light source corresponds to one display area;

[0011] After the two light sources are reflected by the first reflector, the second reflector and the pupil box in sequence, two virtual image distance subsystems with different virtual image distances are formed.

[0012] Optionally, in some optional embodiments, the Z axis of the first three-dimensional rectangular coordinate system is set to a horizontal direction passing through the center of the aperture, the right is the positive direction of the Z axis of the first three-dimensional rectangular coordinate system, and the left is the negative direction of the Z axis of the first three-dimensional rectangular coordinate system;

[0013] The Y axis of the first three-dimensional rectangular coordinate system is perpendicular to the Z axis of the first three-dimensional rectangular coordinate system, the positive direction of the Y axis of the first three-dimensional rectangular coordinate system is upward, and the negative direction of the Y axis of the first three-dimensional rectangular coordinate system is downward;

[0014] The X-axis of the first three-dimensional rectangular coordinate system is perpendicular to the YZ plane of the first three-dimensional rectangular coordinate system, inward is the positive direction of the X-axis of the first three-dimensional rectangular coordinate system, and outward is the negative direction of the X-axis of the first three-dimensional rectangular coordinate system, wherein the YZ plane of the first three-dimensional rectangular coordinate system is a plane jointly formed by the Y-axis of the first three-dimensional rectangular coordinate system and the Z-axis of the first three-dimensional rectangular coordinate system.

[0015] Optionally, in some optional embodiments, the reflective surface of the first reflector in the third three-dimensional rectangular coordinate system and the reflective surface of the second reflector in the second three-dimensional rectangular coordinate system are both 10th-order polynomial free-form surfaces of the following formula:

[0016]

[0017] Wherein, z is the surface sag, c is the surface curvature, k is the quadratic surface coefficient, and A1-A 65 are the polynomial coefficients of .

[0018] Optionally, in certain optional embodiments, the plane of the display screen is arranged in the XY plane of the fourth three-dimensional rectangular coordinate system, wherein the XY plane of the fourth three-dimensional rectangular coordinate system is jointly constituted by the X axis of the fourth three-dimensional rectangular coordinate system and the Y axis of the fourth three-dimensional rectangular coordinate system.

[0019] Optionally, in some optional embodiments, the material of the first reflector and the second reflector is aluminum, copper, silicon carbide or silicon dioxide.

[0020] Optionally, in some optional embodiments, a layer of anti-reflection film is provided on the reflective surface of the first reflector and the second reflector.

[0021] Optionally, in certain optional embodiments, the field of view of the virtual image distance subsystem of the virtual image distance length is 10°×3°, the angle in the horizontal direction is between -5° and 5°, and the angle in the vertical direction is between -1.5° and 1.5°;

[0022] The field angle of the virtual image distance subsystem with a short virtual image distance is 6°×2°, the angle in the horizontal direction is between -3° and 3°, and the angle in the vertical direction is between -4.5° and -2.5°.

[0023] Optionally, in certain optional embodiments, the display screen has a size of 90 mm×64.38 mm;

[0024] The virtual image distance subsystem with a virtual image distance length corresponds to a first display area of ​​the display screen, and the size of the first display area is 90 mm×30.8 mm;

[0025] The virtual image distance subsystem with a short virtual image distance corresponds to a second display area of ​​the display screen, and the size of the second display area is 56.8 mm×21.7 mm.

[0026] Optionally, in some optional embodiments, the virtual image distance corresponding to the virtual image distance subsystem with a long virtual image distance is 8m, and the virtual image distance corresponding to the virtual image distance subsystem with a short virtual image distance is 5m.

[0027] Optionally, in certain optional embodiments, the system further comprises: a windshield surface;

[0028] The windshield surface is arranged on the front windshield of the vehicle;

[0029] After the two light sources are reflected by the first reflector, the second reflector, the windshield and the pupil box in sequence, two virtual image distance subsystems with different virtual image distances are formed.

[0030] By means of the above technical scheme, the utility model provides a dual-focal plane head-up display system comprising: a pupil box, a display screen, a first reflector and a second reflector; the pupil box is arranged at a first position, wherein the first position is in a first three-dimensional rectangular coordinate system with the center of the pupil box as the origin; the second reflector is arranged at a second position, wherein the second position is in a second three-dimensional rectangular coordinate system with the geometric center of the second reflector as the origin; the first reflector is arranged at a third position, wherein the third position is in a third three-dimensional rectangular coordinate system with the geometric center of the first reflector as the origin; the display screen is arranged at a fourth position, wherein the fourth position is in a fourth three-dimensional rectangular coordinate system with the center of the display screen as the origin; the display screen is provided with two display areas to emit two light sources, wherein one light source corresponds to one display area; after the two light sources are reflected by the first reflector, the second reflector and the pupil box respectively in sequence, two virtual image distance subsystems with different virtual image distances are formed. It can be seen from this that the present invention can construct two virtual image distance subsystems with different virtual image distances based on the same reflector, thereby being able to display two virtual images with different virtual image distances at two positions respectively, which is convenient for the driver to view, has a high user experience, is conducive to safe driving and has low cost.

[0031] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 A schematic structural diagram of a dual-focal-plane head-up display system provided by an embodiment of the utility model is shown;

[0034] Figure 2 A schematic diagram of the optical path of a dual-focal-plane head-up display system provided by an embodiment of the utility model;

[0035] Figure 3A and Figure 3B A schematic diagram of a first modulation transfer function MTF curve provided by an embodiment of the utility model;

[0036] Figure 4A and Figure 4BA schematic diagram of a second modulation transfer function MTF curve provided by an embodiment of the utility model;

[0037] Figure 5 A schematic diagram of a third modulation transfer function MTF curve provided by an embodiment of the utility model;

[0038] Fig. 6A and Figure 6B A schematic diagram of a fourth modulation transfer function MTF curve provided by an embodiment of the utility model;

[0039] Fig. 7A and Figure 7B A schematic diagram of a fifth modulation transfer function MTF curve provided by an embodiment of the utility model;

[0040] Fig. 8A and Figure 8B A schematic diagram of a sixth modulation transfer function MTF curve provided by an embodiment of the utility model;

[0041] Fig.9A and Fig. 9B A schematic diagram of a seventh modulation transfer function MTF curve provided by an embodiment of the utility model;

[0042] Fig. 10A and Fig. 10B A schematic diagram of an eighth modulation transfer function MTF curve provided by an embodiment of the utility model;

[0043] Fig.11A and Fig. 11B A ninth modulation transfer function MTF curve diagram provided by an embodiment of the utility model;

[0044] Fig. 12A and Fig. 12B A schematic diagram of a system distortion grid diagram provided by an embodiment of the utility model;

[0045] Fig.13 A schematic diagram of nine eye positions provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0046] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0047] like Figure 1As shown, a dual-focal plane head-up display system includes: a pupil box 102, a display screen 110, a first reflector 108 and a second reflector 106;

[0048] The pupil box 102 is disposed at a first position, wherein the first position is located in a first three-dimensional rectangular coordinate system with the center of the pupil box 102 as the origin;

[0049] For example, in some optional embodiments, the Z axis of the first three-dimensional rectangular coordinate system is set to be a horizontal direction passing through the center of the aperture, the right is the positive direction of the Z axis of the first three-dimensional rectangular coordinate system, and the left is the negative direction of the Z axis of the first three-dimensional rectangular coordinate system;

[0050] The Y axis of the first three-dimensional rectangular coordinate system is perpendicular to the Z axis of the first three-dimensional rectangular coordinate system, the positive direction of the Y axis of the first three-dimensional rectangular coordinate system is upward, and the negative direction of the Y axis of the first three-dimensional rectangular coordinate system is downward;

[0051] The X-axis of the first three-dimensional rectangular coordinate system is perpendicular to the YZ plane of the first three-dimensional rectangular coordinate system, inward is the positive direction of the X-axis of the first three-dimensional rectangular coordinate system, and outward is the negative direction of the X-axis of the first three-dimensional rectangular coordinate system, wherein the YZ plane of the first three-dimensional rectangular coordinate system is a plane jointly formed by the Y-axis of the first three-dimensional rectangular coordinate system and the Z-axis of the first three-dimensional rectangular coordinate system.

[0052] Optionally, the pupil box 102, display screen 110, reflector and aperture mentioned in this application are all related concepts in the field. Please refer to the relevant description of the vehicle-mounted HUD system for details. This application does not provide a process description for this.

[0053] Optionally, the X-axis, Y-axis, and Z-axis of the first three-dimensional rectangular coordinate system are correspondingly understood as Figure 1 As shown in (x1, y1, z1), this application does not impose any limitation on this.

[0054] Optionally, the present application does not impose any specific limitation on the size of the pupil box 102, and it can be selected according to actual needs. For example, the size of the pupil box 102 is 130 mm (the unit of length is "millimeter") × 50 mm.

[0055] The second reflector 106 is disposed at a second position, wherein the second position is located in a second three-dimensional rectangular coordinate system with a geometric center of the second reflector 106 as an origin, and the second three-dimensional rectangular coordinate system is obtained by rotating the first three-dimensional rectangular coordinate system;

[0056] For example, the first three-dimensional rectangular coordinate system is rotated by a first angle around the X axis, a second angle around the Y axis, and a third angle around the Z axis to obtain the second three-dimensional rectangular coordinate system.

[0057] The first reflector 108 is disposed at a third position, wherein the third position is located in a third three-dimensional rectangular coordinate system with the geometric center of the first reflector 108 as the origin, and the third three-dimensional rectangular coordinate system is obtained by rotating based on the first three-dimensional rectangular coordinate system;

[0058] For example, after the first three-dimensional rectangular coordinate system is rotated by a fourth angle around the X axis, a fifth angle around the Y axis, and a sixth angle around the Z axis, a third three-dimensional rectangular coordinate system is obtained.

[0059] Optionally, in some optional embodiments, the reflection surface of the first reflector 108 in the third three-dimensional rectangular coordinate system and the reflection surface of the second reflector 106 in the second three-dimensional rectangular coordinate system are both 10th-order polynomial free-form surfaces of the following formula:

[0060]

[0061] Wherein, z is the surface sag, c is the surface curvature, k is the quadratic surface coefficient, and A1-A 65 are the polynomial coefficients of .

[0062] Optionally, the above surface sag, surface curvature, quadratic surface coefficient and polynomial coefficient are all well-known technical concepts in the art. For details, please refer to the relevant explanations in the art, and this application does not limit this. It should be noted that these parameters are preset values ​​and can be set according to actual needs.

[0063] For example, for the second reflector 106, its corresponding surface sag, surface curvature, quadratic surface coefficient and polynomial coefficient are shown in Table 1 below.

[0064] Table 1

[0065]

[0066]

[0067]

[0068] For another example, for the first reflector 108, its corresponding surface sag, surface curvature, quadratic surface coefficient and polynomial coefficient are shown in Table 2 below.

[0069] Table 2

[0070]

[0071]

[0072]

[0073] Optionally, the present application does not impose any specific restrictions on the material, shape and size of the first reflector 108 and the second reflector 106 , which can be set according to actual needs.

[0074] For example, in some optional embodiments, the first reflector 108 and the second reflector 106 are made of aluminum, copper, silicon carbide or silicon dioxide.

[0075] For another example, in some optional implementations, a layer of anti-reflection film is disposed on the reflective surfaces of the first reflector 108 and the second reflector 106 .

[0076] Generally speaking, the higher the reflectivity of the first reflector 108 and the second reflector 106, the better. Therefore, in addition to selecting materials with higher reflectivity, the present application may also coat the reflective surface of the reflector with a layer of gold film as an anti-reflection film to further improve the emissivity of the reflector. The present application does not impose any restrictions on this.

[0077] The display screen 110 is set at a fourth position, wherein the fourth position is located in a fourth three-dimensional rectangular coordinate system with the center of the display screen 110 as the origin, and the fourth three-dimensional rectangular coordinate system is obtained by rotating based on the first three-dimensional rectangular coordinate system;

[0078] For example, after the first three-dimensional rectangular coordinate system is rotated by the seventh angle around the X axis, the eighth angle around the Y axis, and the ninth angle around the Z axis, a fourth three-dimensional rectangular coordinate system is obtained.

[0079] Optionally, in certain optional embodiments, the plane of the display screen 110 is set in the XY plane of the fourth three-dimensional rectangular coordinate system, wherein the XY plane of the fourth three-dimensional rectangular coordinate system is composed of the X axis of the fourth three-dimensional rectangular coordinate system and the Y axis of the fourth three-dimensional rectangular coordinate system.

[0080] Optionally, the display screen 110 is an image generation unit, and its relative position and angle with the reflector directly affect the final imaging optical indicators, such as virtual image distance, distortion and MTF. Therefore, the utility model can define the above-mentioned three-dimensional rectangular coordinate system. The above-mentioned three-dimensional rectangular coordinate system and the components are bound together. By determining the position and rotation angle of the second three-dimensional rectangular coordinate system, the third three-dimensional rectangular coordinate system and the fourth three-dimensional rectangular coordinate system relative to the first three-dimensional rectangular coordinate system, the position, distance and angle are indirectly determined, and the present application does not limit this.

[0081] For example, the origin of the second three-dimensional rectangular coordinate system (x2, y2, z2) is at the position (-61.70939, -448.03024, 980.87373) of the first three-dimensional rectangular coordinate system (x1, y1, z1) (unit: mm). That is, the second three-dimensional rectangular coordinate system is rotated 148.14713 degrees relative to the linear axis parallel to the x-axis of the first three-dimensional rectangular coordinate system through the origin of the second three-dimensional rectangular coordinate system, and then rotated -10.73328 degrees around the new y-axis, and then rotated -18.48983 degrees around the new z-axis.

[0082] The origin of the third three-dimensional rectangular coordinate system (x3, y3, z3) is at the position (-23.69683, -446.01297, 793.71270) of the first three-dimensional rectangular coordinate system (x1, y1, z1) (unit: mm). That is, the third three-dimensional rectangular coordinate system is rotated 134.94123 degrees relative to the linear axis parallel to the x-axis of the first three-dimensional rectangular coordinate system through the origin of the third three-dimensional rectangular coordinate system, and then rotated -7.55663 degrees around the new y-axis, and then rotated 0.31525 degrees around the new z-axis.

[0083] The origin of the fourth three-dimensional rectangular coordinate system (x4, y4, z4) is at the position (-19.79584, -524.48316, 810.49118) of the first three-dimensional rectangular coordinate system (x1, y1, z1) (unit: mm). That is, the fourth three-dimensional rectangular coordinate system is rotated -72.49122 degrees relative to the linear axis parallel to the x-axis of the first three-dimensional rectangular coordinate system through the origin of the fourth three-dimensional rectangular coordinate system, and then rotated -3.17211 degrees around the new y-axis, and then rotated -11.5113 degrees around the new z-axis, and the utility model does not impose any restrictions on this.

[0084] The display screen 110 is provided with two display areas to emit two light sources, wherein one light source corresponds to one display area;

[0085] After the two light sources are reflected by the first reflector 108 , the second reflector 106 and the pupil box 102 in sequence, two virtual image distance subsystems with different virtual image distances are formed.

[0086] Optionally, in certain optional embodiments, the field of view of the virtual image distance subsystem of the virtual image distance length is 10°×3°, the angle in the horizontal direction is between -5° and 5°, and the angle in the vertical direction is between -1.5° and 1.5°;

[0087] The field angle of the virtual image distance subsystem with a short virtual image distance is 6°×2°, the angle in the horizontal direction is between -3° and 3°, and the angle in the vertical direction is between -4.5° and -2.5°.

[0088] Optionally, the present application is not limited to the above-mentioned parameters related to the field of view angle, and they can be set according to actual needs.

[0089] Optionally, in some optional embodiments, the display screen 110 has a size of 90 mm×64.38 mm;

[0090] The virtual image distance subsystem with a virtual image distance length corresponds to a first display area of ​​the display screen 110 , and the size of the first display area is 90 mm×30.8 mm;

[0091] The virtual image distance subsystem with a short virtual image distance corresponds to the second display area of ​​the display screen 110 , and the size of the second display area is 56.8 mm×21.7 mm.

[0092] Optionally, the present application is not limited to the size of the display screen 110 , the size of the first display area, and the size of the second display area, and they can be set according to actual needs.

[0093] Optionally, in some optional embodiments, the virtual image distance corresponding to the virtual image distance subsystem with a long virtual image distance is 8m (the unit of length is "meter"), and the virtual image distance corresponding to the virtual image distance subsystem with a short virtual image distance is 5m.

[0094] Optionally, the present application is not limited to the size of the virtual image distance and can be set according to actual needs.

[0095] Optional, such as Figure 1 As shown, in some optional embodiments, the system further includes: a windshield surface 104;

[0096] The windshield surface 104 is arranged on the front windshield of the vehicle;

[0097] After the two light sources are reflected by the first reflector 108 , the second reflector 106 , the windshield 104 and the pupil box 102 in sequence, two virtual image distance subsystems with different virtual image distances are formed.

[0098] It should be noted that: Figure 1 After being reflected by the first reflector 108, the second reflector 106, the windshield and the pupil box 102, the light source emitted by the display screen 110 shown in the figure obtains two virtual images 112 and 114 with different optical paths and different virtual image distances, which is not limited in the present application.

[0099] In order to clearly describe the present invention, the following is provided: Figure 2-Figure 13 Experimental data of . Among them,

[0100] Figure 2A schematic diagram of the optical path of a dual-focal plane head-up display system provided in an embodiment of the utility model.

[0101] Figure 3A and Figure 3B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided by the embodiment of the utility model is evaluated at the eye position of (0mm, 0mm) with an aperture of 4mm in diameter.

[0102] Figure 4A and Figure 4B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in the embodiment of the utility model is evaluated at the eye position of (0mm, 23mm) with an aperture of 4mm in diameter.

[0103] Figure 5 The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in an embodiment of the present invention is evaluated at the eye position of (0mm, -23mm) with an aperture of 4mm in diameter.

[0104] Fig. 6A and Figure 6B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in an embodiment of the present invention is evaluated at the eye position of (63mm, 0mm) with a 4mm diameter aperture.

[0105] Fig. 7A and Figure 7B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in the embodiment of the utility model is evaluated at the eye position of (63mm, 23mm) with a 4mm diameter aperture.

[0106] Fig. 8A and Figure 8B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in the embodiment of the utility model is evaluated at the eye position of (63mm, -23mm) with a 4mm diameter aperture.

[0107] Fig.9A and Fig. 9B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in an embodiment of the utility model is evaluated at the eye position of (-63mm, 0mm) with a 4mm diameter aperture.

[0108] Fig. 10A and Fig. 10B The modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in the embodiment of the utility model is evaluated at the eye position of (-63mm, 23mm) with a 4mm diameter aperture.

[0109] Fig.11A and Fig. 11BThe modulation transfer function (MTF) curve of the dual-focal plane head-up display system provided in an embodiment of the present invention is evaluated at the eye position of (-63mm, -23mm) with an aperture of 4mm in diameter.

[0110] See Figure 3 to Fig.13 It can be seen that the dual-focal plane head-up display system is at different eye positions inside the pupil box 102. Fig.13 , through the nine eye positions, the eye position moves within the eye box to observe the imaging changes, which facilitates more accurate calculation of imaging indicators. Modulation transfer function MTF in the visible light band evaluated with a 4mm circular aperture. As can be seen from the figure, except for the slightly worse MTF of the edge field of view of the edge eye position (-63mm, -23mm), the image quality of other eye positions is relatively good, which can basically meet the design standard of the head-up display system with an MTF value greater than 0.3 when the spatial frequency is 0-3cycle / mm.

[0111] Fig. 12A and Fig. 12B A system distortion grid diagram of the dual-focal plane head-up display system provided in an embodiment of the present utility model evaluated at the eye position of (0mm, 0mm).

[0112] See also Fig. 12A and Fig. 12B It can be seen that the distortion grid diagram of the long virtual image distance and short virtual image distance subsystems of the dual-focal plane head-up display system evaluated at the central eye position. The maximum radial distortion and tangential distortion of the long virtual image distance subsystem are 3.63% and 3.27%. The maximum radial distortion and tangential distortion of the short virtual image distance subsystem are 2.57% and 4.03%. The actual focal length and vertical axis magnification of the system in the x and y directions are different, which can be compensated by image pre-distortion correction.

[0113] Fig.13 Nine eye positions of the dual-focal plane head-up display system provided in an embodiment of the utility model.

[0114] In summary, the dual-focal-plane head-up display system of the present application can be a free-form off-axis reflective dual-focal-plane head-up display system, which has the following advantages over the traditional off-axis reflective dual-focal-plane head-up display system: the surface shape of the reflector adopts a free-form surface, which has more controllable variables than a spherical or aspherical system, and is more conducive to correcting aberrations. Compared with the existing scheme that different focal planes (subsystems) can use different reflectors, and different focal planes (subsystems) use different display surfaces (PGU), the two subsystems of the present application share the same reflector (primary mirror, i.e., the second reflector 106 of the present application) and share the same image plane (display surface, PGU), so the difficulty of processing, testing, and assembly of the entire system is greatly reduced, and the cost of the system will also be reduced.

[0115] In the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the article or device including the elements.

[0116] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0117] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in the present invention, but will conform to the widest range consistent with the principles and novel features disclosed in the present invention.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A dual-focal-plane head-up display system, characterized in that: include: A pupil box, a display screen, a first reflector and a second reflector; The pupil box is arranged at a first position, wherein the first position is located in a first three-dimensional rectangular coordinate system with the center of the pupil box as the origin; The second reflector is disposed at a second position, wherein the second position is located in a second three-dimensional rectangular coordinate system with a geometric center of the second reflector as an origin, and the second three-dimensional rectangular coordinate system is obtained by rotating the first three-dimensional rectangular coordinate system; The first reflector is set at a third position, wherein the third position is located in a third three-dimensional rectangular coordinate system with the geometric center of the first reflector as the origin, and the third three-dimensional rectangular coordinate system is obtained by rotating based on the first three-dimensional rectangular coordinate system; The display screen is set at a fourth position, wherein the fourth position is located in a fourth three-dimensional rectangular coordinate system with the center of the display screen as the origin, and the fourth three-dimensional rectangular coordinate system is obtained by rotating based on the first three-dimensional rectangular coordinate system; The display screen is provided with two display areas to emit two light sources, wherein one light source corresponds to one display area; After the two light sources are reflected by the first reflector, the second reflector and the pupil box in sequence, two virtual image distance subsystems with different virtual image distances are formed.

2. The system according to claim 1, characterized in that The Z axis of the first three-dimensional rectangular coordinate system is set to be a horizontal direction passing through the center of the aperture, the right is the positive direction of the Z axis of the first three-dimensional rectangular coordinate system, and the left is the negative direction of the Z axis of the first three-dimensional rectangular coordinate system; The Y axis of the first three-dimensional rectangular coordinate system is perpendicular to the Z axis of the first three-dimensional rectangular coordinate system, the positive direction of the Y axis of the first three-dimensional rectangular coordinate system is upward, and the negative direction of the Y axis of the first three-dimensional rectangular coordinate system is downward; The X-axis of the first three-dimensional rectangular coordinate system is perpendicular to the YZ plane of the first three-dimensional rectangular coordinate system, inward is the positive direction of the X-axis of the first three-dimensional rectangular coordinate system, and outward is the negative direction of the X-axis of the first three-dimensional rectangular coordinate system, wherein the YZ plane of the first three-dimensional rectangular coordinate system is a plane jointly formed by the Y-axis of the first three-dimensional rectangular coordinate system and the Z-axis of the first three-dimensional rectangular coordinate system.

3. The system according to claim 2, characterized in that The reflecting surface of the first reflecting mirror in the third three-dimensional rectangular coordinate system and the reflecting surface of the second reflecting mirror in the second three-dimensional rectangular coordinate system are both 10th-order polynomial free-form surfaces of the following formula; Wherein, z is the surface sag, c is the surface curvature, k is the quadratic surface coefficient, and A1-A 65 are the polynomial coefficients of .

4. The system according to claim 3, characterized in that The plane of the display screen is arranged in the XY plane of the fourth three-dimensional rectangular coordinate system, wherein the XY plane of the fourth three-dimensional rectangular coordinate system is composed of the X axis of the fourth three-dimensional rectangular coordinate system and the Y axis of the fourth three-dimensional rectangular coordinate system.

5. The system according to claim 1, characterized in that The first reflector and the second reflector are made of aluminum, copper, silicon carbide or silicon dioxide.

6. The system according to claim 5, characterized in that The reflective surfaces of the first reflector and the second reflector are provided with a layer of anti-reflection film.

7. The system according to claim 1, characterized in that The field angle of view of the virtual image distance subsystem with a virtual image distance length is 10°×3°, the angle in the horizontal direction is between -5° and 5°, and the angle in the vertical direction is between -1.5° and 1.5°; The field angle of the virtual image distance subsystem with a short virtual image distance is 6°×2°, the angle in the horizontal direction is between -3° and 3°, and the angle in the vertical direction is between -4.5° and -2.5°.

8. The system according to claim 7, characterized in that The size of the display screen is 90 mm × 64.38 mm; The virtual image distance subsystem with a virtual image distance length corresponds to a first display area of ​​the display screen, and the size of the first display area is 90 mm×30.8 mm; The virtual image distance subsystem with a short virtual image distance corresponds to a second display area of ​​the display screen, and the size of the second display area is 56.8 mm×21.7 mm.

9. The system according to claim 8, characterized in that The virtual image distance corresponding to the virtual image distance subsystem with a long virtual image distance is 8m, and the virtual image distance corresponding to the virtual image distance subsystem with a short virtual image distance is 5m.

10. The system according to claim 1, characterized in that The system further comprises: a windshield surface; The windshield surface is arranged on the front windshield of the vehicle; After the two light sources are reflected by the first reflector, the second reflector, the windshield and the pupil box in sequence, two virtual image distance subsystems with different virtual image distances are formed.

Images